US20080206107A1 - Gas sensor apparatus for automotive exhaust gas applications - Google Patents
Gas sensor apparatus for automotive exhaust gas applications Download PDFInfo
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- US20080206107A1 US20080206107A1 US11/710,068 US71006807A US2008206107A1 US 20080206107 A1 US20080206107 A1 US 20080206107A1 US 71006807 A US71006807 A US 71006807A US 2008206107 A1 US2008206107 A1 US 2008206107A1
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- gas sensor
- sensor element
- ceramic substrate
- heater
- gas
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/12—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body in dependence upon absorption of a fluid; of a solid body in dependence upon reaction with a fluid, for detecting components in the fluid
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49004—Electrical device making including measuring or testing of device or component part
Definitions
- Embodiments are generally related to sensor methods and systems. Embodiments are also related to gas sensors. Embodiments are additionally related to gas sensor packaging devices, systems and methods of forming the same.
- Sensors are often utilized in association with internal combustion engines to measure operating parameters and constituents of a resulting feed stream.
- an exhaust gas sensor in a control system of an internal combustion engine can be used to measure the parameter of air/fuel ratio, CO, CO 2 , NO x etc. It is important to determine the gas concentration of exhaust gas in order to control the emission of an automotive engine. A control system can then use this information to control the engine parameters and thereby allow for minimum emissions.
- An engine controller can then employ the air/fuel ratio information to control the feed stream that flows through the engine and into an after treatment device, such as a catalytic converter.
- an after treatment device such as a catalytic converter.
- a properly controlled gas feed stream is important for the complete operation of the exhaust after treatment and during light-off and steady-state warmed-up operations of the utilized control system.
- Construction of a current sensor element can take place in the context of a planar-type (e.g., thin and long ceramic) substrate, which protrudes external from gas sensor housing for measuring gas concentration. Since the configuration is planar and thinner, the possibility of breakage due to vibration and mechanical shock is very high.
- planar-type e.g., thin and long ceramic
- a gas sensor element In order to sense gas concentration such as O2, NOx etc.
- a gas sensor element should be operated at high temperature.
- Zirconia sensor for measuring oxygen it should be maintained at 650 deg C.
- An electric power circuit controls the temperature of the sensor element. Designing of sensor element with smaller in size is important in order to reduce power required to maintain at this temperature.
- the gas sensor apparatus generally includes a gas sensor element comprising a heater and a plurality of electrodes. Additionally, a ceramic substrate can be provided for supporting the plurality of electrodes on one side of the ceramic substrate and the heater on an opposite side of the ceramic substrate. The gas sensor element is preferably embedded in the ceramic substrate. The ceramic substrate also possesses a substantially circular shape in order to prevent a breakage of the gas sensor element, avoid thermal loss, and permit the gas sensor apparatus to withstand mechanical shock and high vibrations while occupying a minimal packaging space.
- the gas sensor apparatus also includes a plurality of contact terminals connected to the ceramic substrate in order to provide at least one electrical connection to the gas sensor apparatus.
- a metallic housing can also be provided, which surrounds and protects the gas sensor element, the heater element and the ceramic substrate.
- the gas the sensor element additionally includes a holding end portion located and secured in the metallic housing and a sensing end portion exposed to exhaust gases thereof.
- the heater can be provided in the form of a plurality of platinum heater elements, while electrodes are preferably formed from platinum.
- the sensing side of the substrate can include two platinum electrodes over which a sensing material can be coated such as Metal Oxide semiconductor (MOS), or upon which a zirconia element can be attached.
- MOS Metal Oxide semiconductor
- the gas sensor element also includes at least one platinum conductive pad.
- the plurality of contact terminals can be resistance-welded to the ceramic substrate.
- the heater also maintains the temperature of the gas sensor element.
- the metallic housing can be configured to include an outer baffle and an inner baffle provided in the metallic housing, thereby covering a gas exposed portion of the gas sensor element.
- the inner baffle forms a cup-like groove towards the gas sensor element.
- an embossed feature can be provided, which assists a flow of gas flow near the gas sensor element.
- the disclosed gas sensor apparatus is based an innovative packaging design that avoid breakage of the sensor element, while the substrate shape can be circular with one side constituting a heater side and the other side functioning as sensor side.
- the contact pads can be screen-printed, while the contact terminals can be resistance-welded or any other suitable joining process to one or more of the contact pads.
- the substrate has a minimum contact surface with the housing and can be designed for less operating power.
- the sensor occupies less space as the sensor element size is minimized according to such a design.
- the circular ceramic substrate generally includes a platinum heater on one side (i.e., the heater side) and platinum electrodes on the other side, which provide for printing sensing material such as a metal oxide semiconductor.
- FIG. 1 illustrates a front view of gas sensor apparatus, which can be implemented in accordance with a preferred embodiment
- FIG. 2A illustrates a longitudinal cross-sectional view of the gas sensor apparatus depicted in FIG. 1 , which can be implemented in accordance with a preferred embodiment
- FIG. 2B illustrates a longitudinal cross-sectional view of the gas sensor apparatus depicted in FIG. 1-2A , which can be implemented in accordance with a preferred embodiment
- FIG. 3 illustrates exploded view of the gas sensor apparatus as depicted in FIG. 1-2 , which can be implemented in accordance with an alternative embodiment
- FIG. 4 illustrates a schematic drawing for top, front and bottom view of a sensor element, which can be implemented in accordance with an alternative embodiment
- FIG. 5 illustrates a sectional view of improved gas flow of gas sensor apparatus, which can be implemented in accordance with a preferred embodiment
- FIG. 6 illustrates a high level flow chart of operations depicting an improved method of gas flow to sensor element, which can be implemented in accordance with a preferred embodiment
- FIG. 7A illustrates a front view of a pipe-gas sensor apparatus assembly employed to determine the gas content such as NOx, O2, CO, CO2 etc. of exhaust gas generated by an internal combustion engine, which can be implemented in accordance with an alternative embodiment
- FIG. 7B illustrates a side view A of a pipe-gas sensor assembly, which can be utilized to determine the gas content of exhaust gas generated by an internal combustion engine, which can be implemented in accordance with an alternative embodiment.
- FIG. 1 illustrates a side view of a gas sensor apparatus 100 , which can be implemented in accordance with a preferred embodiment.
- FIG. 2A illustrates a longitudinal cross-sectional view of the gas sensor apparatus 100 as depicted in FIG. 1 , in accordance with a preferred embodiment.
- the gas sensor apparatus 100 generally includes an embossing 102 , a laser welding 103 , a collar 104 , and a welding 105 .
- the gas sensor apparatus 100 includes a crimping 101 to seal the cable 201 as depicted in FIG. 2A , and an embossing 102 to retain a ceramic insulator 205 as also depicted in FIG.
- the gas sensor apparatus 100 also includes a collar 104 located in a portion of the main shell 206 as indicated in FIG. 2A and a welding 105 of an outer baffle 211 as depicted in FIG. 2A with the main shell 206 .
- the gas sensor apparatus 100 shown in FIG. 2A can be utilized to determine the gas content of exhaust gas generated by an internal combustion engine.
- the gas sensor apparatus 100 includes a connecting cable 201 associated with a rear cover 202 , a sleeve 203 and a metallic wire 214 to cable crimping 204 .
- the sleeve 203 can be formed from, for example, Teflon.
- a sensor element 209 can be held by an inner ceramic holder 208 and an outer ceramic holder 210 maintained within a main shell 206 .
- a ceramic insulator 205 and a ceramic potting 207 can also be provided.
- the sensor element 209 is generally surrounded by an outer baffle 211 and an inner baffle 212 in the region 213 where the sensor element 209 is exposed to the exhaust gases.
- FIG. 2B illustrates a longitudinal sectional view of the gas sensor apparatus 100 depicted in FIG. 1-2A , which can be implemented in accordance with a preferred embodiment. Note that in the embodiment disclosed herein, four metallic wires 214 are indicated. It can be appreciated, however, that this number may vary; that is, fewer or more metallic wires 214 may be utilized depending upon design considerations.
- the longitudinal sectional view depicted in FIG. 2B of the gas sensor apparatus 100 illustrates the metallic wires 214 with cable crimping 204 and joined with substrate 215 .
- FIG. 3 illustrates an exploded view of the gas sensor apparatus 100 , which can be implemented in accordance with an alternative embodiment.
- the gas sensor apparatus 100 depicted in FIG. 1 includes a Teflon sleeve 203 , a connecting cable 201 , a metallic wire 214 to cable crimping 204 , a rear cover 202 , a ceramic insulator 205 , a main shell 206 , and a ceramic potting 207 .
- the gas sensor apparatus 300 also includes a sensor element 209 with an inner ceramic holder 208 and an outer ceramic holder 210 .
- the Teflon sleeve 203 provides a grease-free connection to the connecting cable 201 which is tied tightly with the metallic wires 214 that are encapsulated within a rear cover 202 .
- the outer ceramic holder 210 and inner ceramic holder 208 hold the sensor element 209 embedded within the ceramic substrate 401 as depicted in FIG. 4 .
- the ceramic insulator 205 and ceramic potting 207 provides thermal insulation to the sensor element 209 .
- the gas sensor apparatus 100 additionally includes outer baffle 211 and inner baffle 212 which acts as a protective shield for the sensor element 209 in a region 213 where the sensor element 209 is exposed to exhaust gases.
- the sensor element 209 , ceramic insulator 205 , ceramic potting 207 , inner ceramic holder 208 and outer ceramic holder 210 are enclosed within a main shell 206 which prevents the sensor element 209 form breakage. Note that in FIGS. 2A and 3 , identical or similar parts or elements are generally indicated by identical reference numerals.
- FIG. 4 illustrates a schematic side view of a sensing component 400 and a sensor element 209 , which can be implemented in accordance with an alternative embodiment.
- the sensor element 209 can be embedded in a substrate 401 having a side platinum conductive coating 402 to take the sensing electrode to rear side.
- the substrate 401 can be preferably formed in a circular shape in which one side of the substrate 401 constitutes the heater side 403 and the other or opposite side of the substrate 401 functions as the sensor side 404 .
- the substrate 401 can be configured, for example, from materials such as aluminum oxide.
- Sensing component 400 can be adapted for use with the gas sensor apparatus 100 described herein, depending upon design considerations.
- the 501 and 505 are inlet holes formed in around the outer and inner baffles and 506 is single outlet of inner baffle. Gas enters through inlet 501 of outer baffle and enters through inlets 505 of inner baffle. The gas flows and hits the embossed feature of inner baffle and flows upward to gas sensor element 209 . Gas exits through outlet 506 of inner baffle.
Abstract
Description
- Embodiments are generally related to sensor methods and systems. Embodiments are also related to gas sensors. Embodiments are additionally related to gas sensor packaging devices, systems and methods of forming the same.
- Sensors are often utilized in association with internal combustion engines to measure operating parameters and constituents of a resulting feed stream. For example, an exhaust gas sensor in a control system of an internal combustion engine can be used to measure the parameter of air/fuel ratio, CO, CO2, NOx etc. It is important to determine the gas concentration of exhaust gas in order to control the emission of an automotive engine. A control system can then use this information to control the engine parameters and thereby allow for minimum emissions.
- An engine controller can then employ the air/fuel ratio information to control the feed stream that flows through the engine and into an after treatment device, such as a catalytic converter. A properly controlled gas feed stream is important for the complete operation of the exhaust after treatment and during light-off and steady-state warmed-up operations of the utilized control system.
- Construction of a current sensor element can take place in the context of a planar-type (e.g., thin and long ceramic) substrate, which protrudes external from gas sensor housing for measuring gas concentration. Since the configuration is planar and thinner, the possibility of breakage due to vibration and mechanical shock is very high.
- It is known that the control of burning associated with an internal combustion engine is a function of the concentration of air-fuel ratio contained in exhaust gases. The concentration of the NOx and the air-fuel ratio is effective in providing energy savings and emission control capabilities. In gas sensor configurations suitable for measuring the concentration of oxygen or other gases like CO, NOx, CO2, etc in exhaust gases, a solid electrolyte body constructed from zirconia or Metal Oxide semiconductor (MOS) based gas sensors can be utilized. This type of gas sensor, however, in order to be effective, must be reduced in size, while maintaining efficient production costs and improving its durability and reliability. These factors are difficult to achieve.
- In order to sense gas concentration such as O2, NOx etc. A gas sensor element should be operated at high temperature. For example Zirconia sensor for measuring oxygen, it should be maintained at 650 deg C. An electric power circuit controls the temperature of the sensor element. Designing of sensor element with smaller in size is important in order to reduce power required to maintain at this temperature.
- It is believed that a solution to overcoming these problems involves the implementation of an improved sensor apparatus, which can be efficiently fabricated at a low cost for automotive exhaust gas applications.
- The following summary is provided to facilitate an understanding of some of the innovative features unique to the embodiments disclosed and is not intended to be a full description. A full appreciation of the various aspects of the embodiments can be gained by taking the entire specification, claims, drawings, and abstract as a whole.
- It is, therefore, one aspect of the present invention to provide for an improved gas sensor apparatus and method.
- It is another aspect of the present invention to provide for a gas sensor apparatus that avoids breakage of the utilized sensor element.
- It is another aspect of the present invention to provide for a gas sensor packaging apparatus that in which thermal loss is minimized.
- It is further aspect of the present invention to provide for a gas sensor apparatus that operates with a reduced operating power.
- The aforementioned aspects and other objectives and advantages can now be achieved as described herein. A gas sensor apparatus and method of forming the same are disclosed herein. The gas sensor apparatus generally includes a gas sensor element comprising a heater and a plurality of electrodes. Additionally, a ceramic substrate can be provided for supporting the plurality of electrodes on one side of the ceramic substrate and the heater on an opposite side of the ceramic substrate. The gas sensor element is preferably embedded in the ceramic substrate. The ceramic substrate also possesses a substantially circular shape in order to prevent a breakage of the gas sensor element, avoid thermal loss, and permit the gas sensor apparatus to withstand mechanical shock and high vibrations while occupying a minimal packaging space.
- The gas sensor apparatus also includes a plurality of contact terminals connected to the ceramic substrate in order to provide at least one electrical connection to the gas sensor apparatus. A metallic housing can also be provided, which surrounds and protects the gas sensor element, the heater element and the ceramic substrate. The gas the sensor element additionally includes a holding end portion located and secured in the metallic housing and a sensing end portion exposed to exhaust gases thereof. The heater can be provided in the form of a plurality of platinum heater elements, while electrodes are preferably formed from platinum. The sensing side of the substrate can include two platinum electrodes over which a sensing material can be coated such as Metal Oxide semiconductor (MOS), or upon which a zirconia element can be attached.
- The gas sensor element also includes at least one platinum conductive pad. The plurality of contact terminals can be resistance-welded to the ceramic substrate. The heater also maintains the temperature of the gas sensor element. Additionally, the metallic housing can be configured to include an outer baffle and an inner baffle provided in the metallic housing, thereby covering a gas exposed portion of the gas sensor element. The inner baffle forms a cup-like groove towards the gas sensor element. Additionally, an embossed feature can be provided, which assists a flow of gas flow near the gas sensor element.
- The disclosed gas sensor apparatus is based an innovative packaging design that avoid breakage of the sensor element, while the substrate shape can be circular with one side constituting a heater side and the other side functioning as sensor side. The contact pads can be screen-printed, while the contact terminals can be resistance-welded or any other suitable joining process to one or more of the contact pads. To minimize thermal loss, the substrate has a minimum contact surface with the housing and can be designed for less operating power. The sensor occupies less space as the sensor element size is minimized according to such a design. The circular ceramic substrate generally includes a platinum heater on one side (i.e., the heater side) and platinum electrodes on the other side, which provide for printing sensing material such as a metal oxide semiconductor.
- The accompanying figures, in which like reference numerals refer to identical or functionally-similar elements throughout the separate views and which are incorporated in and form a part of the specification, further illustrate the embodiments and, together with the detailed description, serve to explain the embodiments disclosed herein.
-
FIG. 1 illustrates a front view of gas sensor apparatus, which can be implemented in accordance with a preferred embodiment; -
FIG. 2A illustrates a longitudinal cross-sectional view of the gas sensor apparatus depicted inFIG. 1 , which can be implemented in accordance with a preferred embodiment; -
FIG. 2B illustrates a longitudinal cross-sectional view of the gas sensor apparatus depicted inFIG. 1-2A , which can be implemented in accordance with a preferred embodiment; -
FIG. 3 illustrates exploded view of the gas sensor apparatus as depicted inFIG. 1-2 , which can be implemented in accordance with an alternative embodiment; -
FIG. 4 illustrates a schematic drawing for top, front and bottom view of a sensor element, which can be implemented in accordance with an alternative embodiment; -
FIG. 5 illustrates a sectional view of improved gas flow of gas sensor apparatus, which can be implemented in accordance with a preferred embodiment; -
FIG. 6 illustrates a high level flow chart of operations depicting an improved method of gas flow to sensor element, which can be implemented in accordance with a preferred embodiment; -
FIG. 7A illustrates a front view of a pipe-gas sensor apparatus assembly employed to determine the gas content such as NOx, O2, CO, CO2 etc. of exhaust gas generated by an internal combustion engine, which can be implemented in accordance with an alternative embodiment; and -
FIG. 7B illustrates a side view A of a pipe-gas sensor assembly, which can be utilized to determine the gas content of exhaust gas generated by an internal combustion engine, which can be implemented in accordance with an alternative embodiment. - The particular values and configurations discussed in these non-limiting examples can be varied and are cited merely to illustrate at least one embodiment and are not intended to limit the scope thereof.
-
FIG. 1 illustrates a side view of agas sensor apparatus 100, which can be implemented in accordance with a preferred embodiment.FIG. 2A illustrates a longitudinal cross-sectional view of thegas sensor apparatus 100 as depicted inFIG. 1 , in accordance with a preferred embodiment. Thegas sensor apparatus 100 generally includes anembossing 102, alaser welding 103, acollar 104, and awelding 105. Thegas sensor apparatus 100 includes a crimping 101 to seal thecable 201 as depicted inFIG. 2A , and anembossing 102 to retain aceramic insulator 205 as also depicted inFIG. 2A and laser welding 103 of arear cover 202 with amain shell 206 as further depicted inFIG. 2A . Thegas sensor apparatus 100 also includes acollar 104 located in a portion of themain shell 206 as indicated inFIG. 2A and awelding 105 of anouter baffle 211 as depicted inFIG. 2A with themain shell 206. - The
gas sensor apparatus 100 shown inFIG. 2A can be utilized to determine the gas content of exhaust gas generated by an internal combustion engine. Thegas sensor apparatus 100 includes a connectingcable 201 associated with arear cover 202, asleeve 203 and ametallic wire 214 to cable crimping 204. Note that thesleeve 203 can be formed from, for example, Teflon. Asensor element 209 can be held by an innerceramic holder 208 and an outerceramic holder 210 maintained within amain shell 206. Aceramic insulator 205 and aceramic potting 207 can also be provided. Thesensor element 209 is generally surrounded by anouter baffle 211 and aninner baffle 212 in theregion 213 where thesensor element 209 is exposed to the exhaust gases. -
FIG. 2B illustrates a longitudinal sectional view of thegas sensor apparatus 100 depicted inFIG. 1-2A , which can be implemented in accordance with a preferred embodiment. Note that in the embodiment disclosed herein, fourmetallic wires 214 are indicated. It can be appreciated, however, that this number may vary; that is, fewer or moremetallic wires 214 may be utilized depending upon design considerations. The longitudinal sectional view depicted inFIG. 2B of thegas sensor apparatus 100 illustrates themetallic wires 214 with cable crimping 204 and joined withsubstrate 215. -
FIG. 3 illustrates an exploded view of thegas sensor apparatus 100, which can be implemented in accordance with an alternative embodiment. Thegas sensor apparatus 100 depicted inFIG. 1 includes aTeflon sleeve 203, a connectingcable 201, ametallic wire 214 to cable crimping 204, arear cover 202, aceramic insulator 205, amain shell 206, and aceramic potting 207. Thegas sensor apparatus 300 also includes asensor element 209 with an innerceramic holder 208 and an outerceramic holder 210. TheTeflon sleeve 203 provides a grease-free connection to the connectingcable 201 which is tied tightly with themetallic wires 214 that are encapsulated within arear cover 202. The outerceramic holder 210 and innerceramic holder 208 hold thesensor element 209 embedded within theceramic substrate 401 as depicted inFIG. 4 . - The
ceramic insulator 205 andceramic potting 207 provides thermal insulation to thesensor element 209. Thegas sensor apparatus 100 additionally includesouter baffle 211 andinner baffle 212 which acts as a protective shield for thesensor element 209 in aregion 213 where thesensor element 209 is exposed to exhaust gases. Thesensor element 209,ceramic insulator 205,ceramic potting 207, innerceramic holder 208 and outerceramic holder 210 are enclosed within amain shell 206 which prevents thesensor element 209 form breakage. Note that inFIGS. 2A and 3 , identical or similar parts or elements are generally indicated by identical reference numerals. Thus, thereference numerals FIG. 2A refer to the same components inFIG. 3 . -
FIG. 4 illustrates a schematic side view of asensing component 400 and asensor element 209, which can be implemented in accordance with an alternative embodiment. As indicated inFIG. 4 , thesensor element 209 can be embedded in asubstrate 401 having a side platinumconductive coating 402 to take the sensing electrode to rear side. To avoid breakage ofsensor element 209, thesubstrate 401 can be preferably formed in a circular shape in which one side of thesubstrate 401 constitutes theheater side 403 and the other or opposite side of thesubstrate 401 functions as thesensor side 404. Thesubstrate 401 can be configured, for example, from materials such as aluminum oxide.Sensing component 400 can be adapted for use with thegas sensor apparatus 100 described herein, depending upon design considerations. - The
sensor side 404 can include asensing material 405, which can be, for example, a metal oxide semiconductor coated via screen-printing or attaching a sensing element over the substrate. Thesensor side 404 includessensing side electrodes 406 for measuring sensor signal andplatinum electrode 407 held inceramic substrate 401. Theheater side 403 generally includes aplatinum heater 408 that maintains a temperature approximately >6500 C forsensor element 209 andelectrodes 409 for connecting wires. Thesensor element 209 can be suspended in order to minimize heat transfer between thesensor element 209 and thegas sensor packaging 100. Such a structure has the advantage that theplatinum heater element 408 provides heat to thesensor element 209 over an area that results in essentially uniform, balanced thermal conditions and which counteract the tendency of thesensor element 209 to fracture. -
FIG. 5 illustrates a sectional view of improvedgas sensor apparatus 100, including a gas flow to thesensor element 209, in accordance with a preferred embodiment. Note that inFIGS. 2 and 5 identical or similar parts or elements are generally indicated by identical reference numerals. Thus, thereference numerals FIG. 2 refer to the same components inFIG. 5 . Thegas sensor element 209 includes a gas-exposed portion. Thegas sensor apparatus 100 maintains thegas sensor element 209 and includes anouter baffle 211 and aninner baffle 212 so as to shield the gas-exposed portion of thesensing element 209. The 501 and 505 are inlet holes formed in around the outer and inner baffles and 506 is single outlet of inner baffle. Gas enters throughinlet 501 of outer baffle and enters throughinlets 505 of inner baffle. The gas flows and hits the embossed feature of inner baffle and flows upward togas sensor element 209. Gas exits throughoutlet 506 of inner baffle. -
FIG. 6 illustrates a high-level flow chart of operations depicting logical operational steps of amethod 600 for forming the improvedgas sensor apparatus 100, in accordance with a preferred embodiment. Note that themethod 600 illustrated inFIG. 6 can be followed to construct the gas sensor apparatus described previously. As indicated atblock 601, the process begins. Thereafter, as depicted atblock 602, the metallic housing contains an inner baffle and an outer baffle to cover the gas exposed portion of sensor element. The inner baffle can be configured as indicated next atblock 603 to contain a cup-like groove extending inward. Thereafter, as depicted atblock 604, the flow of gas through the inner baffle can be provided. As depicted atblock 605, the embossed feature described earlier can be provided to assist the gas flow near the sensor element. The process can then terminate as indicated atblock 606. -
FIG. 7A illustrates a front view of a pipe-gas sensor apparatus 700 employed to determine the NOx content of exhaust gas generated by an internal combustion engine, which can be implemented in accordance with an alternative embodiment. Thegas sensor apparatus 100 can be mounted on anexhaust pipe 701. Thepipe holder 702 is designed to hold thegas sensor apparatus 100 on theexhaust pipe 701. Anouter nut 703 of the screw joining thegas sensor apparatus 100 to thepipe holder 702 is also illustrated in the view. -
FIG. 7B illustrates aside view A 700 of pipe-gas sensor assembly, which can be utilized to determine the gas content of exhaust gas generated by an internal combustion engine, which can be implemented in accordance with an alternative embodiment. Note that inFIGS. 7A and 7B , identical or similar parts or elements are generally indicated by identical reference numerals. Thus, thereference numerals FIG. 7A refer to the same components inFIG. 7B . Note that inFIGS. 1-7 , identical or similar parts or elements are indicated by identical reference numerals. Thus, theFIG. 7 illustration also generally contains thegas sensor apparatus 100 which is described above with respect toFIG. 1-7 . - It will be appreciated that variations of the above-disclosed and other features and functions, or alternatives thereof, may be desirably combined into many other different systems or applications. Also, it can be appreciated that various presently unforeseen or unanticipated alternatives, modifications, variations or improvements therein may be subsequently made by those skilled in the art, which are also intended to be encompassed by the following claims.
Claims (20)
Priority Applications (3)
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US11/710,068 US20080206107A1 (en) | 2007-02-23 | 2007-02-23 | Gas sensor apparatus for automotive exhaust gas applications |
PCT/US2008/054645 WO2008103867A1 (en) | 2007-02-23 | 2008-02-22 | Gas sensor apparatus for automotive exhaust gas applications |
US12/870,649 US8359902B2 (en) | 2007-02-23 | 2010-08-27 | Gas sensor apparatus for automotive exhaust gas applications |
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US11/710,068 US20080206107A1 (en) | 2007-02-23 | 2007-02-23 | Gas sensor apparatus for automotive exhaust gas applications |
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US12/870,649 Continuation US8359902B2 (en) | 2007-02-23 | 2010-08-27 | Gas sensor apparatus for automotive exhaust gas applications |
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US11/710,068 Abandoned US20080206107A1 (en) | 2007-02-23 | 2007-02-23 | Gas sensor apparatus for automotive exhaust gas applications |
US12/870,649 Expired - Fee Related US8359902B2 (en) | 2007-02-23 | 2010-08-27 | Gas sensor apparatus for automotive exhaust gas applications |
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US20100314249A1 (en) * | 2007-02-23 | 2010-12-16 | Honeywell International Inc. | Gas sensor apparatus for automotive exhaust gas applications |
CN103487487A (en) * | 2012-06-12 | 2014-01-01 | 日本特殊陶业株式会社 | Gas sensor |
WO2014130669A1 (en) * | 2013-02-21 | 2014-08-28 | Amphenol Corporation | Sensor and method of making a sensor |
WO2015094812A1 (en) * | 2013-12-18 | 2015-06-25 | Cummins Emission Solutions, Inc. | Integrated sensor water shield |
US20160069923A1 (en) * | 2014-09-10 | 2016-03-10 | Sumitomo Wiring Systems, Ltd. | Wheel speed sensor |
US11002700B2 (en) | 2017-11-21 | 2021-05-11 | Honeywell International Inc. | High temperature gas sensor |
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US11435252B2 (en) | 2018-05-01 | 2022-09-06 | Baker Hughes, A Ge Company, Llc | Gas sensor system |
US20220357187A1 (en) * | 2021-05-10 | 2022-11-10 | Applied Materials, Inc. | Packaging design for a flow sensor and methods of manufacturing thereof |
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Cited By (13)
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US20100314249A1 (en) * | 2007-02-23 | 2010-12-16 | Honeywell International Inc. | Gas sensor apparatus for automotive exhaust gas applications |
US8359902B2 (en) | 2007-02-23 | 2013-01-29 | Honeywell International Inc. | Gas sensor apparatus for automotive exhaust gas applications |
CN103487487A (en) * | 2012-06-12 | 2014-01-01 | 日本特殊陶业株式会社 | Gas sensor |
WO2014130669A1 (en) * | 2013-02-21 | 2014-08-28 | Amphenol Corporation | Sensor and method of making a sensor |
CN105793704A (en) * | 2013-12-18 | 2016-07-20 | 康明斯排放处理公司 | Integrated sensor water shield |
WO2015094812A1 (en) * | 2013-12-18 | 2015-06-25 | Cummins Emission Solutions, Inc. | Integrated sensor water shield |
GB2535089A (en) * | 2013-12-18 | 2016-08-10 | Cummins Emission Solutions Inc | Integrated sensor water shield |
US20160305297A1 (en) * | 2013-12-18 | 2016-10-20 | Cummins Emission Solutions, Inc. | Integrated Sensor Water Shield |
US10047655B2 (en) * | 2013-12-18 | 2018-08-14 | Cummins Emission Solutions, Inc. | Integrated sensor water shield |
GB2535089B (en) * | 2013-12-18 | 2020-04-15 | Cummins Emission Solutions Inc | Integrated sensor water shield |
US20160069923A1 (en) * | 2014-09-10 | 2016-03-10 | Sumitomo Wiring Systems, Ltd. | Wheel speed sensor |
US9696334B2 (en) * | 2014-09-10 | 2017-07-04 | Sumitomo Wiring Systems, Ltd. | Wheel speed sensor |
US11002700B2 (en) | 2017-11-21 | 2021-05-11 | Honeywell International Inc. | High temperature gas sensor |
Also Published As
Publication number | Publication date |
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WO2008103867A1 (en) | 2008-08-28 |
US20100314249A1 (en) | 2010-12-16 |
US8359902B2 (en) | 2013-01-29 |
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