CN105987398A - Combustion controlling device and combustion system - Google Patents

Abstract

The invention relates to a combustion controlling device and a combustion system. The combustion controlling device includes an output circuit (102) that supplies a binary output signal (VOUT) to one contact of an abnormality detection element (6-9), an input circuit (103) that generates a binary input signal (VIN) corresponding to a signal output from another contact of the abnormality detection element, a sampling portion (105) that samples the input signal within a first period (T1) and a second period (T2) in which the output signal is respectively a first logic level (H) and a second logic level (L), an abnormality detection element state determining portion (1061) that determines the state of the object to be monitored on the basis of a sampling result in the first period, and a circuit failure determining portion (1062) that determines whether a failure occurs in the output circuit and the input circuit on the basis of a sampling result in the second period. An object of the present invention is to improve a determination precision of an abnormality detection element such as an interlock in a combustion control.

Description

Combustion control device and combustion system

Technical field

The present invention relates to a kind of combustion control device and combustion system, particularly relate to one and can carry out high-precision burning The combustion control device of security control.

Background technology

Generally, in the operation control system of combustion furnace, by combustion control device, monitor and be arranged at combustion furnace The flame of burner, in-furnace temperature, the pressure of combustion air, the pressure of fuel etc. of supplied burner are while firing Burn control, therefore ensure that the security of burning.Specifically, combustion control device carries out such control: will be with burning The states such as the related gas pressure of the safe operation of stove, air pressure reflect into the state of abnormality detection element, only different at this The state representation of normal detecting element permits that combustion furnace runs (referring for example to patent document 1) in the case of normally.

Here, above-mentioned abnormality detection element refer to have the connection obtaining between two contacts according to the state monitoring object with And the element of the construction of a certain state in disconnecting, for example, commonly known as interlocker, limiter.As above-mentioned interlocking Device, it is known to for example monitor the air pressure lower limit interlocker of the supply having or not combustion air, the supply shape monitoring fuel The gas pressure upper limit interlocker of state and gas pressure lower limit interlocker etc..

General interlocker has this construction: containing the switch being arranged between two contacts, according to the outputting cutting of sensor Change the on-off of described switch.This interlocker carries out such control: when monitoring that object is normal, connect switch Lead to thus connect between two contacts, when monitoring that object is abnormal, disconnect switch thus disconnect between two contacts.

In conventional combustion control device, such as described in non-patent literature 1, to the interlocker with above-mentioned construction Whether the contact input pulse signal of one side, come from the contact output of the opposing party of above-mentioned interlocker according to above-mentioned pulse signal Judge disconnection and the connection of this interlocker.

Prior art literature:

Patent document 1: Japanese Unexamined Patent Publication 2010-286128 publication

Non-patent literature 1: " the imperial skill The of combustion safety system (uses combustion completion with い U Application ト ロ ラ The exploitation of the controller of control technology) ", bear pool male, azbil Technical Review, issue in January, 2011, Azbil Corporation.

Problems to be solved by the invention:

But, in combustion system, need when the operation control system of combustion furnace occurs abnormal to stop rapidly combustion event Guarantee safety, on the other hand need when the operation control system of combustion furnace is normal to realize stable combustion event.Therefore, The related abnormality detection such as the interlocker to security control are required swiftness and high accuracy.For example, for such as interlocker The major accident such as the exception blast directly resulting in combustion furnace like that of supervision object (gas pressure, air pressure etc.) It is swiftness, on the other hand, for the fault etc. of the peripheral circuit of interlocker, in order to prevent error detection that abnormal requirement detects Combustion event is caused to stop and requiring high measurement accuracy.

But, above-mentioned conventional interlocking decision method is that solely basis is input to combustion control device by interlocking The input interlocked of the presence or absence of pulse signal judge, it is impossible to have or not exception to interlocking and have or not fault and carry out district Do not judge, therefore, swiftness perhaps very abundant for the judgement monitoring object, but the precision judging is difficult to claim Must go up fully.

For example, have in the combustion system of large-scale combustion furnace as the iron and steel stove of factory etc., connect each interlocker and In the case that the distribution of combustion control device reaches hundreds of meters, the dead resistance composition of above-mentioned distribution increases, thus is easily subject to Arrive the impact of the very noisy of the power source from close distribution, frequency converter etc..Additionally, above-mentioned distribution is often tied up by many Getting up to lay, therefore, when a distribution transmission pulse signal, this pulse signal is possible to be induced to other distributions, Become noise contribution.When this noise transmission is to above-mentioned distribution, the decision method of interlocking conventional hardly can be filled The judgement precision divided.

Content of the invention

It is an object of the invention to, Combustion System improves the judgement precision of the abnormality detection elements such as interlocker.

The combustion control device (the 1st, 10) of the present invention has: output circuit (102), this output circuit is to according to supervision The state of object obtains a side's of the abnormality detection element (6～9) of a certain state in the connection between two contacts or disconnection The output signal (VOUT) of contact supply two-value；Input circuit (103_1～103_n), this input circuit will be from quilt The signal of the contact output of the opposing party of the abnormality detection element of supply output signal, as input, generates and the letter being inputted Number the input signal (DIN_1～DIN_n) of the corresponding two-value of logic level；Sampling portion (105), this sampling portion exists Carry out the sampling of input signal in the first period (T1) that output signal becomes the first logic level (H), and defeated Carry out the sampling of input signal, abnormality detection unit in going out the second phase (T2) that signal becomes the second logic level (L) Part state detection unit (1061), the sampling result of the first period according to sampling portion for this abnormality detection element state detection unit Judge the state of the supervision object of described abnormality detection element；And fault detection unit (1062), this fault The sampling result of the second phase according to sampling portion for the detection unit judges that output circuit and input circuit have fault-free.

It in above-mentioned combustion control device, is configured to: abnormality detection element state detection unit is by referring to continuous print N The sampling value of the integer of more than 2 (N be) secondary first period, is detecting the signal inputing to input circuit (VIN_1～VIN_n) is in the case that the logic level N continuous time of first period is the first logic level, it is determined that different The supervision object of normal detecting element is normal, is detecting that the logic level in first period for the signal inputing to input circuit connects In the case that continuous n times are the second logic level, it is determined that the supervision object of abnormality detection element is abnormal.

It in above-mentioned combustion control device, is configured to: by referring to continuous print M, (M is 2 to fault detection unit Above integer) sampling value of secondary second phase, detecting the signal inputing to input circuit patrolling in the second phase In the case that volume level continuous N time is the second logic level, it is determined that at least one party of output circuit and input circuit occurs Fault.

In above-mentioned combustion control device, M >=N can be set as.And, M and N is arbitrary.

It in above-mentioned combustion control device, is configured to: sampling portion is switched in output signal from the second logic level After have passed through the very first time (Td1) after one logic level, carry out the sampling of first period.

It in above-mentioned combustion control device, is configured to: sampling portion is switched in output signal from the first logic level After have passed through the second time (Td2) after two logic levels, carry out the sampling of the second phase.

In above-mentioned combustion control device, the very first time can be set as below the second time.And, the very first time and Two times were arbitrary.

It in above-mentioned combustion control device, is configured to: have multiple by sampling portion, the judgement of abnormality detection element state The functional module (110) that portion and fault detection unit are constituted, each functional module is by different multiple program process Device (101a, 101b) respectively constitutes.

In above-mentioned combustion control device, can also have control unit (11), this control unit is according to abnormality detection element shape The operation of result of determination control burner (43) of state detection unit and fault detection unit.

The combustion system (500) of the present invention, it has above-mentioned combustion control device (1) and is arranged on combustion chamber (40) Said burner interior, that controlled by above-mentioned combustion control device.

Additionally, in the above description, as an example, the inscape pair with invention is represented by the reference marks with parantheses The inscape on drawing answered.

Invention effect:

By described above, according to the present invention, Combustion System can improve the judgement of the abnormality detection elements such as interlocker Precision.

Brief description

Fig. 1 is the figure of the composition representing the combustion system with the combustion control device involved by embodiment.

Fig. 2 is the figure of the composition of the safety control representing the combustion control device involved by embodiment.

Fig. 3 is used to the sequential of the determination processing related to interlocker of combustion control device involved by embodiment for the explanation Figure.

Fig. 4 is the stream of the flow process of the determination processing related to interlocker representing the combustion control device involved by embodiment Cheng Tu.

Fig. 5 is the flow chart of the flow process of the interlocking input determination processing representing the combustion control device involved by embodiment.

Fig. 6 is the flow chart of the flow process of the fault determination processing representing the combustion control device involved by embodiment.

When Fig. 7 is the safety control representing with the combustion control device involved by multiple microcontroller implementation embodiments The figure of configuration example.

Detailed description of the invention

Below, referring to the drawings, embodiments of the present invention are illustrated.

(composition of combustion system)

Fig. 1 is the figure of the composition representing the combustion system with the combustion control device involved by present embodiment.

Combustion system 500 shown in this figure is the system being made burning Indoor Combustion by burner.As combustion system 500, Can be with large scale industry burnings such as the iron and steel stoves of back yard industry combustion furnace, the factories etc. such as exemplified deodorization stove and heating furnace Stove.

Specifically, combustion system 500 has burner the 4th, fuel flow path the 2nd, air flow circuit the 3rd, controller and the 5th, makees Cross intensification limiter 6 and interlocker 7～9 and combustion control device 1 for abnormality detection element.

Burner 4 include temperature sensor the 41st, the 42nd, main burner the 43rd, igniter the 44th, flame detector 45 and Igniter (igniter) 46.Main burner 43 configures in combustion chamber 40, heats in combustion chamber 40. Igniter 44 is used to the burner of igniting main burner 43.Igniter (IG) 46 is used to burner ignition Device, it includes such as ignition transformer and electrode bar, produces high-tension spark by described ignition transformer, Thus by described electrode bar, igniter 44 is lighted a fire.Flame detector 45 detects the presence of main burner 43 and produces The device of flame.Temperature sensor 41 is the sensor detecting the temperature in combustion chamber 40, the temperature survey of this sensor The temperature control that value is used in combustion chamber 40.Temperature sensor 42 is the sensor detecting the temperature in combustion chamber 40, The detection of the abnormal high temperature state that the measured temperature of this sensor is used in combustion chamber 40.

Fuel flow path 2 is used to supply the stream of fuel to burner 4.Fuel flow path 2 is by being externally supplied fuel Primary flow path 2a and first flow path 2b from primary flow path 2a bifurcated and second flow path 2c are constituted.First flow path 2b and main combustion Burner 43 connects, and second flow path 2c is connected with igniter 44.Thus, the fuel being supplied to primary flow path 2a is fed to main Burner 43 and igniter 44.In addition, first flow path 2b is provided with safety shutoff valve the 21st, 22, second flow path 2c sets There is safety shutoff valve the 23rd, 24.The opening and closing by such as burner control 11 control valve for the safety shutoff valve 21～24.

One end of air flow circuit 3 is connected with air blast 31, and the other end is connected with first flow path 2b.By first flow path 2b The air (air) discharged from air blast 31 is supplied to main burner 43 together with fuel (gas).

Controller 5 is a kind of temperature instruction regulation meter (TIC:Temperature indicating controller), its basis The measured temperature of temperature sensor 41 generate the control signal for combustion control device so that in combustion chamber 40 temperature Degree becomes target temperature.

Cross the overheated preventer that intensification limiter 6 is a kind of abnormal high temperature for detecting in combustion chamber 40.Cross intensification limit Switch 60 and switch driving part 61 that device 6 processed by two contacts, configures between this contact are constituted, this switch drive Portion 61 judges whether the measured temperature of temperature sensor 42 exceedes the design temperature being previously set, according to result of determination control The on-off of system switch 60.For example, switch driving part 61 exceedes at the measured temperature of temperature sensor 42 and sets During fixed temperature, switch 60 is connected, disconnect switch 60 when the measured temperature of temperature sensor 42 is less than design temperature.

Interlocker (air pressure switch) 7 is arranged at air flow circuit 3, and it is that a kind of detection supplies to air flow circuit 3 Whether the pressure of air exceedes the air pressure lower limit interlocker of set setup pressure value.Specifically, interlocker 7 The switch 70 and the switch driving part 71 that by two contacts, configure between this contact are constituted, this switch driving part 71 Judge whether the air pressure in the air flow circuit 3 measured by sensor exceedes the setup pressure value being previously set, according to sentencing Determine the on-off of output control switch 70.For example, air pressure in air flow circuit 3 for the switch driving part 71 surpasses When crossing setup pressure value connecting switch 70, the air pressure in air flow circuit 3 disconnects less than during setup pressure value Switch 70.

Interlocker (gas pressure switch) 8 is arranged at primary flow path 2a, and it is a kind of combustion detecting and supplying to primary flow path 2a Whether the pressure of material (gas) exceedes the gas pressure lower limit interlocker of the threshold pression value being previously set.Specifically, Switch 80 and switch driving part 81 that interlocker 8 by two contacts, configures between this contact are constituted, and this switch drives Whether the gas pressure in dynamic portion 81 judges primary flow path 2a measured by sensor exceedes threshold pression value, according to judgement knot The on-off of fruit control switch 80.For example, under gas pressure in primary flow path 2a for the switch driving part 81 exceedes During pressure limiting force value connecting switch 80, the gas pressure in primary flow path 2a is less than disconnection switch 80 during threshold pression value.

Interlocker (gas pressure switch) 9 is arranged at first flow path 2b, and it is that a kind of detection supply is to main burner 43 The pressure of fuel (gas) whether exceed the gas pressure upper limit interlocker of the pressure upper limit value being previously set.Specifically Saying, the switch 90 that interlocker 9 by two contacts, configures between this contact and switch driving part 91 are constituted, and this is opened Whether the gas pressure closing in drive division 91 judges first flow path 2b measured by sensor exceedes pressure upper limit value, according to The on-off of result of determination control switch 90.For example, gas pressure in first flow path 2b for the switch driving part 91 Switch 90 is connected by power less than during pressure upper limit value, when the gas pressure in first flow path 2b exceedes pressure upper limit value Disconnect switch 90.

Additionally, in the following description, sometimes the company between two contacts will be controlled as the state having according to monitoring object The interlocker 7～9 of the abnormality detection element of the construction that on and off is opened and excessively intensification limiter 6 are referred to as " limiting connection Lock device ".

(composition of combustion control device)

Combustion control device 1 is used to control safely the device of the burning of the burner in combustion chamber 40.Such as Fig. 1 institute Showing, combustion control device 1 is made up of burner control 11 and safety control 10.

Burner control 11 is that a kind of operation by control burner (main burner 43 and igniter 44) is controlled The device of the burning in combustion chamber 40 processed.Specifically, burner control 11 is according to safety control 10 described later Control signal that the instruction (notification signal 14) that sends, controller 5 send and the flame that flame detector 45 sends Detection signal, the startup of the control opening and closing of safety shutoff valve 21～24 and igniter 46, thus carry out deferring to set The igniting of the main burner 43 of fixed ignition order.

Additionally, Fig. 1 shows that combustion system 500 has the situation of a main burner 43, and have in combustion system In the case of multiple main burner, multiple burner control can be set and by single safety control 10 Controlling these burner controls, the plurality of burner control is arranged and to corresponding main combustion for each main burner Burner is controlled.

Safety control 10 is that a kind of safe operation for combustion system 500 is i.e. in order to prevent combustion system 500 Explode and wait and monitor the state of each restriction interlocker, judge the objectionable device of license that burner runs.Specifically Saying, safety control 10 is according to interlocker 7～9 and the contact state (disconnecting or connection) crossing intensification limiter 6 Generate and represent the objectionable notification signal of license 14 of burner operation and be supplied to burner control 11, thus refer to Show license that burner runs and disapprove (to the supply of the fuel of each burner and stopping etc.).

As safety control 10, can the exemplified safe general rule based on industrial combustion furnace (such as JIS B 8415 Deng) manufacture for monitor limit interlocker restriction interlocking modules, set corresponding special with above-mentioned safe general rule The programmable logic controller (PLC) (so-called safety PLC) etc. of software.

Side's contact to each restriction interlocker for the safety control 10 applies pulse signal, and limits connection to from each The logic level of the signal of the opposing party's contact output of lock device judges, thus judges the state of each restriction interlocker.

Specifically, safety control 10 carries out interlocking input determination processing, and this interlocking input determination processing is basis Pulse signal is judging from each logic level limiting the input signal that interlocker sends of the period of the first logic level Each state limiting interlocker.Additionally, safety control 10 carries out fault determination processing, this fault Determination processing is the input signal sending from each restriction interlocker according to the period that pulse signal is the second logic level Logic level judges the fault of output circuit 102 described later and input circuit 103.

Below, the composition and action thereof of safety control 10 is described in detail.

Additionally, in the description of the present application, as an example, by the first logic level as " high (H) level ", Second logic level is illustrated as " low (L) level ".

(composition of safety control)

Fig. 2 is the figure of the composition of the safety control 10 of the combustion control device 1 representing embodiment.

As in figure 2 it is shown, safety control 10 is by multiple outside terminals, microcontroller (MCU) the 101st, output circuit 102nd, the n integer of more than 1 (n be) individual input circuit 103_1,103_n are constituted.Additionally, in fig. 2, at Fig. 2 In, as above-mentioned multiple outside terminals, only illustrate and limit interlocker Stateful Inspection related terminal COM, IN_1～IN_n.

Terminal COM is used to export the outside terminal of output signal VOUT described later, and it is interlocked with constituting each restriction One end (side's contact) of the switch of device connects jointly.For example as in figure 2 it is shown, terminal COM is by distribution 12 difference With the contact a of a side of the switch 70 of interlocker 7, a side of the switch 80 of interlocker 8 contact a ..., with And the contact a of a side of the switch 90 of interlocker 9 connects.Additionally, not shown in figure, but cross intensification limiter 6 Side's contact of switch 60 be also connected to terminal COM.

Terminal IN_1～IN_n each restriction interlocker corresponding is arranged, and is a kind of for inputting from corresponding restriction connection The outside terminal of the signal that lock device sends.For example as in figure 2 it is shown, terminal IN_1 is by distribution 13_1 and interlocker 7 The contact b of the opposing party of switch 70 connects, and terminal IN_2 is by another of the switch 80 of distribution 13_2 and interlocker 8 The contact b of side connects, and terminal IN_n is connected by the contact b of distribution 13_n and the opposing party of the switch 90 of interlocker 9 Connect.Additionally, not shown in figure, but the contact crossing the opposing party of the switch 60 of intensification limiter 6 is also connected to correspondence Input terminal.

Output circuit 102 is the circuit generating output signal VOUT for supplying the two-value to each restriction interlocker. Specifically, output circuit 102 generates the reference pulse signal PS synchronization being generated with pulse generating unit 104 described later Output signal VOUT of two-value, and export to terminal COM.

Specifically, for example as in figure 2 it is shown, output circuit 102 is by buffer circuit BF, photoelectrical coupler PC1, electricity Resistance R1 and PNP transistor Q1 are constituted.Output circuit 102 makes electricity between outside terminal COM and MCU101 Insulate, and the pulse signal by the such as 0-3.3V (or 5.0V) exporting from MCU101 is converted into such as 0V-24V Output signal VOUT of two-value and export to terminal COM.For example, the reference pulse signal from MCU101 output When PS is H (such as 3.3V), connect transistor Q1 output signal VOUT exporting+24V, from MCU101 When the reference pulse signal PS of output is L (such as 0V), "off" transistor Q1.In this case, if accessed The contact connection of the restriction interlocker of point, then make output by pull down resistor R3, R4 of input circuit 103 described later Signal VOUT becomes 0V.On the other hand, if the contact of the restriction interlocker of access point disconnects, then terminal COM Become high resistance.

Input circuit 103_1～103_n each restriction interlocker corresponding is arranged.Input circuit 103_1～103_n (is referred to as When be referred to as " input circuit 103 ") will from corresponding each restriction interlocker export to corresponding terminal IN_1～IN_n Signal VIN_1～the VIN_n (being referred to as " signal VIN " during general designation) of (during general designation be referred to as " terminal IN ") is as defeated Entering, the input signal DIN_1～DIN_n generating the corresponding two-value of logic level with the signal VIN being inputted (is referred to as When be referred to as " input signal DIN ").For example, Fig. 2 illustrates circuits below: input from interlocker by terminal IN_1 The input circuit 103_1 of the signal VIN_1 of the opposing party contact b output of the switch 70 of 7；By terminal IN_2 input Input circuit 103_2 from the signal VIN_2 of the opposing party contact b output of the switch 80 of interlocker 8；And by The input circuit of the signal VIN_n from the opposing party contact b output of the switch 90 of interlocker 9 for the terminal IN_n input 103_n.Additionally, not shown in figure, but from the signal of the opposing party's contact output of the switch 60 crossing intensification limiter 6 It is also input to corresponding input circuit.

Specifically, input circuit 103 is made up of resistance R2～R4 and photoelectrical coupler PC2 for example as shown in Figure 2. Input circuit 103 makes electric insulation between corresponding terminal IN and MCU101, and will enter into corresponding terminal IN's The signal of the two-value of such as 0V-24V be converted into such as 0V-3.3V (or 5.0V) input signal DIN and export to MCU101.Here, the resistance value of resistance R3, R4 output H in the state of the contact connection of each restriction interlocker It is adjusted during output signal VOUT of level (such as 24V), so that the primary side of photoelectrical coupler PC2 Photodiode is connected.

MCU101 is for example made up of the processors such as CPU, various memory and other peripheral circuits.MCU101 The program execution data process being stored according to above-mentioned memory by above-mentioned processor, thus as pulse generating unit the 104th, Sampling portion the 105th, detection unit 106 and notification unit 107 play a role.

Pulse generating unit 104 is the reference pulse generating for interlocker 7～9 and the Stateful Inspection crossing intensification limiter 6 The function part of signal PS.Specifically, pulse generating unit 104 is that one is for example by by crystal oscillator isochronon The reference clock signal that generator generates carries out dividing thus generates cycle and the dutycycle reference pulse signal of regulation The function part of PS.Reference pulse signal PS is e.g. raw based on MCU101 supply voltage (such as 3.3V or 5.0V) The signal of the two-value of the 0V-3.3V (5.0V) becoming.

Sampling portion 105 is to enter the input signal DIN_1～DIN_n being generated by input circuit 103_1～103_n respectively The function part of row sampling.Sampling portion 105 and the reference clock signal being generated by pulse generating unit 104 are Tong Bu sampled Reason.Specifically, sampling portion 105 is the first logic electricity in output signal VOUT (said reference pulse signal PS) The period T1 of flat (H level) carries out the sampling of input signal DIN, and in output signal VOUT (said reference Pulse signal PS) it is the sampling that the period T2 of the second logic level (L level) carries out input signal DIN.Additionally, For the sampling of each input signal DIN_1～DIN_n, sampling portion 105 can be carried out with timesharing, it is also possible to simultaneously to multiple Input signal is sampled.

Detection unit 106 includes interlocking input detection unit 1061, and this interlocking input detection unit 1061 is as according to sampling portion 105 Period T1 sampling result judge each restriction interlocker have N/R abnormality detection element state detection unit.This Outward, it is determined that portion 106 also includes that the sampling result at period T2 according to sampling portion 105 judges output circuit 102 and defeated Entering circuit 103 has trouble-free fault detection unit 1062.

Notification unit 107 generates according to the result of determination of detection unit 106 and represents above-mentioned and represent license that burner runs and not The notification signal 14 of license.

For example, when judging to limit interlocker as " normally " by interlocking input detection unit 1061, generate and represent combustion The notification signal 14 of " license " that burner is run.It is judged to " do not have additionally, work as by fault detection unit 1062 During fault ", generate the notification signal 14 of " license " representing burner operation.On the other hand, when by interlocking When input detection unit 1061 judges to limit interlocker as "abnormal", generate " the disapproving " representing that burner runs Notification signal 14.Additionally, when being judged to " having fault " by fault detection unit 1062, generate table Show the notification signal 14 of " disapproving " that burner runs.

(action of safety control)

Below, illustrate combustion control device 1 associate with interlocker determination processing (interlocking input determination processing with And fault determination processing).

Additionally, in the combustion control device 1 of present embodiment, because each restriction interlocker is carried out at identical judgement Reason, so in the following description, carries out representative explanation, limits to other to the determination processing associating with interlocker 7 The determination processing of interlocker processed association omits the description.

Fig. 3 is used to illustrate the sequential chart of the determination processing related to interlocker of the combustion control device of embodiment.Figure The uppermost of 3 represents the voltage (output signal VOUT) of terminal COM, and upper several second segment of Fig. 3 represents interlocker The state (connection or disconnection) of the contact of 7, upper several 3rd segment tables of Fig. 3 show that the voltage being input to terminal IN_1 is (defeated Enter the signal VIN_1 to input circuit 103_1), the lowermost of Fig. 3 represents the input letter that input circuit 103_1 generates Number DIN_1.

Additionally, the waveform of upper several second segment of Fig. 3 represents switchs 70 connections when high level, the contact a of interlocker 7, B connects, and switchs 70 disconnections when the waveform table shown in Fig. 3 is shown as low level, and contact a, b of interlocker 7 disconnects.

As it is shown on figure 3, pulse generating unit 104 generates the reference pulse signal PS of some cycles TC, then with this benchmark arteries and veins Output signal VOUT rushing signal PS synchronization exports from terminal COM.Here, said reference pulse signal PS and defeated The logic level going out signal VOUT is consistent.

Output signal VOUT is when terminal COM exports, if the switch 70 of interlocker 7 connects (contact connection), Then output signal VOUT is input to input circuit 103_1 via switch 70.In this case, as such as Fig. 3 when Carve shown in the period of t0 to t1, be imported into terminal IN_1 with the signal VIN_1 of output signal VOUT synchronization, logical Cross input circuit 103_1 and generate input signal DIN_1 of the logic contrary with output signal VOUT.

On the other hand, output signal VOUT is when terminal COM exports, if the contact of interlocker 7 disconnects (switch 70 disconnect), then input circuit 103_1 does not has output signal VOUT to input.At this moment, terminal IN_1 passes through resistance R3, R4 are the next arrives ground voltage (0V), and therefore the voltage (signal VIN_1) of terminal IN_1 becomes " 0V ", Input signal DIN_1 becomes " H " level.For example, as shown in the period of moment t1 to the t2 of Fig. 3, interlocker 7 Contact when disconnecting, no matter the logic level of output signal VOUT is how, and input signal DIN_1 all can become " H " Level.

Additionally, in the state of the contact of interlocker 7 connects, in the generation of the transistor Q1 of such as output circuit 102 During power supply short circuit fault, the secondary side phototransistor generation earth fault of the photoelectrical coupler PC2 of input circuit 103_1 When, input signal DIN_1 is fixed to " L level ".For example, Fig. 3 shows at moment t3 input circuit 103_1 The secondary side phototransistor generation earth fault of photoelectrical coupler PC2, later input signal DIN_1 of moment t3 It is fixed to the situation of L level.

Below, the sampling process to sampling portion 105 illustrates.

Input is believed by the period T1 that sampling portion 105 is " H level " in output voltage VO UT (reference clock signal) Number DIN_1 sampling.For example, as it is shown on figure 3, at the sampling moment SI1 of the period T1 of first time to input signal DIN_1 Sampling (sampling value: L), (takes to the sampling of input signal DIN_1 at the sampling moment SI2 of the period T1 of second time Sample value: L) ... by that analogy, input signal DIN_1 of each period T1 is sampled.

In addition, period T2 pair that sampling portion 105 is " L level " in output voltage VO UT (reference clock signal) Input signal DIN_1 samples.For example, as it is shown on figure 3, at the sampling moment SC1 of the period T2 of first time to input Signal DIN_1 samples (sampling value: H), at the sampling moment SC2 of the period T2 of second time to input signal DIN_1 Sampling (sampling value: H) ... by that analogy, during each, input signal DIN_1 is sampled by T2.

Preferably, the sampling in above-mentioned sampling portion 105 is cut in the logic level of output voltage VO UT (reference clock signal) After alternatively, carry out after the stipulated time.For example, as shown in Figure 3, it is preferable that the sampling of period T1 is in output Voltage VOUT (reference clock signal) have passed through stipulated time td1 after " L level " is switched to " H level " Period Ts1 afterwards is carried out.Furthermore it is preferred that the sampling of period T2 is in output voltage VO UT, (reference clock is believed Number) after " H level " is switched to " L level ", have passed through the period Ts2 after stipulated time td2 carries out.Example As arranged transmission and exporting delay circuit (CR circuit or the multistage of output voltage VO UT or reference clock signal Clock circuit etc.), sampling portion 105 starts sampling with the signal exporting from this delay circuit for enabling signal and processes. Or, arrange and carry out timing, a timing using the logic switch of output voltage VO UT or reference clock signal as triggering To the stipulated time with regard to the timer of output signal, sampling portion 105 with from the signal that this timer exports as enabling signal from the beginning of Sampling is processed.

Thus, as described above, even if connecting the distribution of safety control 10 and each restriction interlocker the 12nd, 13 very In the case that long, parasitic resistance components is very big, because can be sampled after the voltage stabilization of input signal DIN, It is possible to suppression relates to the decline of the precision of the judgement of interlocking.

Additionally, with regard to after switching from the logic level of output signal VOUT to stand-by time Td1, the Td2 starting sampling, As long as consider by distribution the 12nd, 13 dead resistance composition etc. suitably set transit time to signal stabilization of being caused Fixed.For example, by being set as Td1 ＜ Td2, quickly detect that the supervision object of interlocker has without exception, and right It in the fault for permanent fault, is sampled after the signal transmitting in the wiring is more stable, it is possible to carry out The judgement of higher precision.

Additionally, the sampling to input signal DIN in period T1 and period T2 only can be entered in period T1, T2 Row is once, it is also possible to carry out repeatedly in period T1, T2.

Below, the interlocking input determination processing of interlocking input detection unit 1061 is illustrated.

The sampling value N continuous of interlocking input input signal DIN in the period T1 in sampling portion 105 for the detection unit 1061 In the case of the integer of more than 2 (N be) is subuniform, judge to limit the prison of interlocker according to this consistent logic level Depending on to as if " normally " or "abnormal".

More specifically, the interlocking input sampling value continuous phase to input signal DIN in period T1 for the detection unit 1061 Number of times consistent mutually counts, when the consistent number of times of this counting is n times, just using now consistent sampling value as input The logic level of signal DIN definite value really.For example, in figure 3, the sampling moment SI1～SIN of continuous print n times The sampling value of input signal DIN_1 with " L level " consistent with each other in the case of, by the logic of input signal DIN_1 Level is defined as " L ", and the sampling value of input signal DIN_1 of the sampling moment SI1～SIN of continuous print n times is with " H In the case that level " is consistent with each other, the logic level of input signal DIN_1 is defined as " H ".And, interlock defeated Enter detection unit 1061 in the case that its determination value is " H level ", it is determined that limit corresponding with this input signal DIN joins Lock device two contacts be "off", i.e. judges corresponding with this input signal DIN limit interlocker supervision object as "abnormal".On the other hand, in the case that its determination value is " L level ", interlocking input detection unit 1061 judges Two contacts of restriction interlocker corresponding with this input signal DIN are " connection ", i.e. judge and this input signal DIN The supervision object of corresponding restriction interlocker is " normally ".

Below, the fault determination processing of fault detection unit 1062 is illustrated.

(M is more than 2 to the sampling value continuous N of input signal DIN in period T2 for the fault detection unit 1062 Integer) secondary for " L level " in the case of, it is determined that at least one party of input circuit 103 and output circuit 102 occurs " fault ".More specifically, the sampling value to input signal DIN in period T2 for the fault detection unit 1062 Number of times for " L level " counts continuously, when this number of times is for " M ", it is determined that input circuit 103 and output circuit There is " fault " at least one party of 102.

For example, as it is shown on figure 3, connect at the secondary side of the photoelectrical coupler PC2 of moment t3 input circuit 103_1 During earth fault, unrelated with signal VIN_1, input signal DIN_1 after that is fixed to " L level ".This In the case of, the sampling value of input signal DIN of period T2 after moment t3 for the fault detection unit 1062 is continuous During for the number of times of " L level " for " M ", it is determined that at least one party of input circuit 103 and output circuit 102 occur " therefore Barrier ".

In addition, the consistent times N of interlocking sampling value used by determination processing for the input and taking used by fault determination processing The consistent number of times M of sample value can be according to the species of the combustion system being suitable for combustion control device 1, required safety etc. Level etc. adjusts.For example, by being set as N ＜ M, the supervision object of quick detection interlocker has without exception, and for For the fault of permanent fault, error detection that can avoid combustion event because noise etc. causes and frequently stop.

Below, the flow process of the determination processing related to interlocker of combustion control device is illustrated.

Fig. 4 is the flow chart of the flow process of the determination processing related to interlocker of the combustion control device representing embodiment.

As described above, the determination processing related to interlocker of combustion control device 1 includes the sampling value based on period T1 Determination processing (interlocking input determination processing) and the determination processing (fault of sampling value based on period T2 Determination processing).

As shown in Figure 4, the determination processing related to interlocker of combustion control device 1 is at the beginning, then first pulse generates Portion 104 generates reference pulse signal PS, and output circuit 102 generates the output signal with this reference pulse signal PS synchronization VOUT(S1).Here, the moment performing the determination processing related to interlocker sets for each restriction interlocker Fixed.For example, the determination processing of a part of restriction interlocker performs when normal after combustion system 500 startup, other Restriction interlocker determination processing combustion system 500 startup after the moment set in advance perform.

Then, sampling portion 105 proceeds by the sampling (S2) of input signal DIN_1～DIN_n.Sampling portion 105 Sampling at the beginning, is then started based on the determination processing of the sampling value of period T1, i.e. joins by interlocking input detection unit 1061 Lock input determination processing (S3).Additionally, start based on the sampling value of period T2 also by fault detection unit 1062 Determination processing, i.e. fault determination processing (S4).Step S3, each determination processing one of S4 perform, then for Burner control 11 output represents license or objectionable notification signal 14 of burner operation.

Additionally, the determination processing of the sampling value based on period T2 of step S4 can be as shown in Figure 4 in the base of step S3 Perform after the determination processing of the sampling value of period T1, it is also possible to after the sampling in sampling portion 105 starts and step The determination processing based on the sampling value of period T1 of S3 performs simultaneously.

Below, the interlocking input determination processing of step S3 and fault determination processing each of step S4 are described in detail From flow process.

First, the flow process of the interlocking input determination processing of step S3 is illustrated.

Fig. 5 is the flow chart of the flow process of the interlocking input determination processing representing the combustion control device involved by embodiment.

During as it is shown in figure 5, start sampling in step s 2, then interlocking input detection unit 1061 is to taking in period T1 Sample value number of times consistent continuously carries out counting (S31).After above-mentioned counting starts, interlocking input detection unit 1061 judges to take Whether sample portion 105 is that N continuous time is consistent (S32) in the sampling value of period T1.Here, it not N continuous time In the case of cause, interlocking input detection unit 1061 continues the consistent number of times of the sampling value at period T1 to sampling portion 105 Count.Further, it is also possible to control into: because noise etc. without produce N continuous subuniform in the case of, After a predetermined time, determination value is set to " H (disconnection) ".

On the other hand, in step s 32, the subuniform feelings of sampling value N continuous at period T1 in sampling portion 105 Under condition, interlocking input detection unit 1061 judges whether its sampling value is " L " (S33).

In step S33, in the case that the sampling value of N continuous T1 of subuniform period is " H ", interlocking input Detection unit 1061 judges the contact "off" of restriction interlocker corresponding with input signal DIN being sampled, it is determined that Supervision object "abnormal" (S36) of this restriction interlocker.Thus, notification unit 107 is according to interlocking input detection unit The result of determination of 1061 represents the notification signal 14 of " disapproving " of burner operation to burner control 11 output (S37)。

On the other hand, in step S33, in the case that the sampling value of N continuous T1 of subuniform period is " L ", Interlocking input detection unit 1061 judges that the contact of restriction interlocker corresponding with input signal DIN being sampled " connects ", Judge the supervision object " normally " (S34) of this restriction interlocker.Thus, notification unit 107 is sentenced according to interlocking input The result of determination determining portion 1061 exports the notification signal 14 of " license " representing burner operation to burner control 11 (S35)。

Below, the flow process of the fault determination processing of step S4 is described in detail.

Fig. 6 is the flow chart of the flow process of the fault determination processing representing the combustion control device involved by embodiment.

By step S2, at the beginning, then period T2 is taken by fault detection unit 1062 in the sampling in sampling portion 105 The sample value number of times for " L " continuously carries out counting (S41).At this moment, fault detection unit 1062 taking at period T2 Sample value starts counting up action after resetting count value when " H " again.

After above-mentioned counting starts, fault detection unit 1062 judge the sampling value of period T2 continuously as " L " time Whether number is more than M time (S42).

In step S42, period T2 sampling value continuously for the number of times of " L " more than M time in the case of, circuit Breakdown determination portion 1062 judges " circuit is faulty " (S43).Thus, notification unit 107 is based on fault detection unit The result of determination of 1062 represents the notification signal 14 of " disapproving " of burner operation to burner control 11 output (S44)。

On the other hand, in step S42, the sampling value number of times for " L " continuously at period T2 is less than M time In the case of, fault detection unit 1062 judges " circuit does not has fault " (S45).In this case, turn again to Step S41, the counting action of the number of times that the sampling value continuing sampling period T2 is " L ".

(effect of combustion control device)

Above, the combustion control device according to the present invention, at the output signal VOUT (arteries and veins of supply to each restriction interlocker Punching) high period between carry out interlocking input judge, between the low period of output signal VOUT, carry out fault sentence Fixed, judge therefore, it is possible to difference is carried out to the exception of the exception of the supervision object of interlocker and the peripheral circuit of interlocker, The judgement precision about interlocking can be improved.

Additionally, according to the combustion control device of the present invention, in output signal VOUT inputing to each restriction interlocker High period between or low period between the sampling value continuous several times of input signal DIN consistent in the case of, this is taken Sample value is set to input signal DIN definite value really, carries out interlocking input based on this determination value and judges and fault judgement.By This, such as even in the signals of distribution the 12nd, 13 transmission in the case of overlapping noise, the misinterpretation that noise causes Also it is difficult to occur, the judgement precise decreasing about interlocking can be suppressed.

Additionally, the sampling in sampling portion 105 warp after the logic level of output voltage VO UT (reference clock signal) switches Carry out after having crossed stipulated time Td1 (Td2), therefore, even if as described above, connecting safety control 1 He Each distribution limiting interlocker the 12nd, 13 parasitic resistance components very big, reach at the signals of distribution the 12nd, 13 transmission In the case of stably requiring time for, because can be sampled after the voltage stabilization of input signal DIN, it is possible to Suppression is about the judgement precise decreasing of interlocking.

Additionally, according to the combustion control device of present embodiment, as described above, using the benchmark that judges as fault The big numerical value of the consistent times N of the sampling value that the consistent number of times M of sampling value is set as being used for the benchmark that interlocking input judges, The detection sensitivity making fault judge is lower than the detection sensitivity that interlocking input judges, thereby, it is possible to quick detection is even The exception of the supervision object of lock, carries out explosion-proof rapidly, on the other hand, for permanent fault, and can be to avoid The mode that combustion event frequently stops because of the error detection that causing of the impact of noise is controlled.That is, ensure that interlocking Abnormality detection swiftness, and realize the high precision int that the fault related to permanent anomaly detects, can obtain Raising to the raising of security of Combustion System and operating stably.

Additionally, the stand-by time to starting sampling is set as Td1 ＜ Td2, thus, as described above, Ensure that abnormality detection swiftness of interlocking the higher precision obtaining fault detection.

From the foregoing it may be appreciated that the combustion control device involved by present embodiment is useful in connection safety control 1 He This large-scale combustion furnace that distribution the 12nd, the 13 technology resistance components very long, distribution of each restriction interlocker are very big is special Effectively.

Above, specifically understand the invention that inventor is done based on embodiment, but the present invention be not limited thereto, It is self-evident for can carrying out various change in the range of without departing from its purport.

For example, in the above-described embodiment, exemplified by the feelings of a microcontroller implementation combustion control device 1 Condition, but it is also possible to realized by multi-microprocessor.

When Fig. 7 is the safety control representing with the combustion control device involved by multiple microcontroller implementation embodiments The figure of configuration example.

As it is shown in fig. 7, be provided with master microprocessor (MCU_M) 101a and secondary microprocessor (MCU_S) 101b, each micro- Processor 101a, 101b are respectively equipped with sampling portion the 105th, detection unit 106 and notification unit 107, thus join restriction The functional module that input judges and fault judges of lock device is made tediously longization and is constituted.

Thus, even if in the case that side's microprocessor occurs bad, also the opposing party's microprocessor can be performed interlocking Input determination processing and fault determination processing, therefore, it is possible to improve security and the burning of combustion system 500 further The security of action.

Additionally, in this case, pulse generating unit 104 is positioned only in microprocessor 101a and microprocessor 101b Either one.For example, figure 7 illustrates the situation being provided with pulse generating unit 104 on master microprocessor 101a. In this case, reference pulse signal PS is from master microprocessor 101a to secondary microprocessor 101b supply, secondary micro-process Device 101b was sampled according to the moment of this reference pulse signal PS.

Additionally, in the figure 7, the exemplified situation being provided with two microprocessors, but it is not limited to this, it is also possible to Arranging the microprocessor of more than three, each microprocessor corresponding arranges the input judgement carrying out limiting interlocker and circuit The functional module of fault verification.

Additionally, in the above-described embodiment, (connection is limited as the abnormality detection element being connected with combustion control device 1 Lock device) an example, exemplified air pressure lower limit interlocker, gas pressure upper limit lower limit interlocker and Cross intensification limiter, but other abnormality detection elements can be suitable for the Combustion System involved by the present application similarly The input determination processing of device 1, this is self-evident.

Additionally, in fig. 2, exemplified output circuit 102 and input circuit 103 have and use photoelectrical coupler The situation of circuit structure, but the circuit structure of output circuit 102 and output circuit 103 is not limited thereto.For example, In the case of not needing electric insulation between outside terminal COM, IN_1～IN_n and MCU101, can be by output electricity Road 102 make not by photoelectrical coupler PC1 based on buffer circuit BF output signal drive transistor Q1 electricity Line structure.Further, it is also possible to input circuit 103 is made following circuit structure: replace photoelectrical coupler PC2 connecing Arranging transistor between ground node and one end of resistance R2, the control electrode (base stage) at this transistor connects resistance R3 And the connection node of resistance R4.

Symbol description:

1 ... combustion control device, 2 ... fuel flow path, 3 ... air flow circuit, 4 ... burner, 5 ... controller, 6 ... mistake Intensification limiter, 7,8,9 ... interlocker, 10 ... safety control, 11 ... burner control, 14 ... notice letter Number, 40 ... combustion chamber, 41,42 ... temperature sensor, 43 ... main burner, 44 ... igniter, 45 ... flame detector, 46 ... igniter (igniter), 60,70,80,90 ... switch, 61,71,81,91 ... switch driving part, 31 ... Air blast, 2a ... primary flow path, 2b ... first flow path, 2c ... second flow path, 21,22,23,24 ... safety shutoff valve, COM, IN_1, IN_n ... terminal, 12,13,13_1,13_n ... distribution, 101,101a, 101b ... microcontroller, 102 ... output circuit, 103,103_1,103_n ... input circuit, 104 ... pulse generating unit, 105 ... sampling portion, 106 ... Detection unit, 1061 ... interlocking input detection unit, 1062 ... fault detection unit, 107 ... notification unit, 110 ... functional block, PS ... reference pulse signal, 500 ... combustion system.

Claims (10)

1. a combustion control device, it is characterised in that have:

Output circuit, this output circuit obtains a certain shape in the connection between two contacts or disconnection to according to the state monitoring object The output signal of the described contact supply two-value of one side of the abnormality detection element of state；

Input circuit, this input circuit is by the institute of the opposing party from the described abnormality detection element being supplied with described output signal State the signal of contact output as input, the input signal of the corresponding two-value of logic level with the signal being inputted for the generation；

Sampling portion, this sampling portion becomes in described output signal and carries out described input signal in the first period of the first logic level Sampling, and become in described output signal and in the second phase of the second logic level, carry out the sampling of described input signal,

Abnormality detection element state detection unit, this abnormality detection element state detection unit is according to the described first phase in described sampling portion Between sampling result judge the state of supervision object of described abnormality detection element；And

Fault detection unit, the sampling result of the described second phase according to described sampling portion for this fault detection unit judges Described output circuit and described input circuit have fault-free.

2. combustion control device according to claim 1, it is characterised in that

Described abnormality detection element state detection unit is by referring to the sampling value of the described first period of continuous print n times, in detection Go out what the logic level N continuous time in described first period for the signal inputing to described input circuit was described first logic level In the case of, it is determined that the supervision object of described abnormality detection element is normal, is detecting that the signal inputing to described input circuit exists In the case that the logic level N continuous of described first period time is for described second logic level, it is determined that described abnormality detection element Supervision object abnormal, wherein, N is the integer of more than 2.

3. combustion control device according to claim 2, it is characterised in that

Described fault detection unit, by referring to the sampling value of the described second phase of continuous print M time, inputs to detecting The signal of described input circuit the logic level continuous N time of the described second phase for described second logic level in the case of, Judging that at least one party of described output circuit and described input circuit breaks down, wherein M is the integer of more than 2.

4. combustion control device according to claim 3, it is characterised in that

M≥N。

5. combustion control device according to any one of claim 1 to 4, it is characterised in that

Described sampling portion have passed through after described second logic level is switched to described first logic level in described output signal After the very first time, carry out the sampling of described first period.

6. combustion control device according to claim 5, it is characterised in that

Described sampling portion have passed through after described first logic level is switched to described second logic level in described output signal After second time, carry out the sampling of the described second phase.

7. combustion control device according to claim 6, it is characterised in that

The described very first time is below described second time.

8. combustion control device according to any one of claim 1 to 4, it is characterised in that

Have and multiple be made up of described sampling portion, described abnormality detection element state detection unit and described circuit detection unit Functional module,

Each described functional module is respectively constituted by different multiple program processing apparatus.

9. combustion control device according to any one of claim 1 to 4, it is characterised in that

Also having control unit, this control unit is according to described abnormality detection element state detection unit and described fault detection unit The operation of result of determination control burner.

10. a combustion system, it is characterised in that have:

Combustion control device described in claim 9；And

The described burner being arranged in combustion chamber, being controlled by described combustion control device.