WO1993025987A1 - Power saving remote keyless entry - Google Patents

Power saving remote keyless entry Download PDF

Info

Publication number
WO1993025987A1
WO1993025987A1 PCT/US1993/005394 US9305394W WO9325987A1 WO 1993025987 A1 WO1993025987 A1 WO 1993025987A1 US 9305394 W US9305394 W US 9305394W WO 9325987 A1 WO9325987 A1 WO 9325987A1
Authority
WO
WIPO (PCT)
Prior art keywords
signal
power
processor
tone
pulses
Prior art date
Application number
PCT/US1993/005394
Other languages
French (fr)
Inventor
Thomas Fleissner
Gerald M. Brehmer
Original Assignee
United Technologies Automotive, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by United Technologies Automotive, Inc. filed Critical United Technologies Automotive, Inc.
Priority to JP6501632A priority Critical patent/JPH06509899A/en
Priority to EP19930914408 priority patent/EP0598107A4/en
Publication of WO1993025987A1 publication Critical patent/WO1993025987A1/en

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C19/00—Electric signal transmission systems
    • G08C19/16—Electric signal transmission systems in which transmission is by pulses
    • G08C19/28—Electric signal transmission systems in which transmission is by pulses using pulse code
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R25/00—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles
    • B60R25/20—Means to switch the anti-theft system on or off
    • B60R25/24—Means to switch the anti-theft system on or off using electronic identifiers containing a code not memorised by the user
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
    • G07C9/00182—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with unidirectional data transmission between data carrier and locks
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
    • G07C9/00309—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with bidirectional data transmission between data carrier and locks
    • G07C2009/00365—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with bidirectional data transmission between data carrier and locks in combination with a wake-up circuit
    • G07C2009/0038—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with bidirectional data transmission between data carrier and locks in combination with a wake-up circuit whereby the wake-up circuit is situated in the keyless data carrier
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
    • G07C2009/00753—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by active electrical keys
    • G07C2009/00769—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by active electrical keys with data transmission performed by wireless means

Definitions

  • This invention relates to remotely controlled systems for vehicles, such as automobile keyless entry systems.
  • Remotely controlled (“keyless”) security systems are becoming increasingly popular in automobiles. These systems typically use a small key chain transmitter. The operator presses a button sending a command as a transmitted coded electromagnetic signal using an infrared or RF carrier. The signal is received at a receiver in the vehicle. At the receiver, a signal processor interprets the decoded information and causes the command function to take place, such as unlocking the doors and providing an audible signal heard (a "chirp”) audible some distance away from the vehicle, confirming that the command has been received and completed.
  • a signal processor interprets the decoded information and causes the command function to take place, such as unlocking the doors and providing an audible signal heard (a "chirp”) audible some distance away from the vehicle, confirming that the command has been received and completed.
  • the receiver and the processor are always in a full power stand-by condition waiting for the command, creating considerable battery drainage, especially if a vehicle is parked for a length of time in colder climates, where available battery power is significantly reduced by lower temperatures.
  • a driver, away for several weeks may return to the vehicle finding a dead battery caused by this continuous power drain in the otherwise "de-powered" vehicle, except perhaps for the clock, although clocks usually blank the A splay when the vehicle is parked to save power.
  • portions of the receiver are identical to portions of the receiver.
  • the signal processor waits until the power-up signal is removed before responding to a command.
  • the power-up signal which proceeds the alarm inactivation signal, comprises a plurality of tone coded pulses.
  • the receiver contains a tone decoder that responds only to particular received pulses.
  • the frequency of the transmitted pulses corresponds to the detection frequency of the decoder and a specified number of pulses must be received.
  • the decoder produces a control signal when those conditions are satisfied.
  • the control signal causes the battery to power the powered down portions of the receiver.
  • the receiver goes to sleep after the command is completed.
  • the last tone pulse (last pulse in the "wake-up signal") initializes a microprocessor routine that interprets the digital command following the wake-up signal.
  • FIG. 1 is a functional block diagram of a keyless entry system embodying the present invention.
  • FIG. 2 is a time graph showing the wake-up and command signals. Best Mode for Carrying Out the Invention
  • a portable remote-control transmitter 10 contains a transmit button 10.1.
  • a user presses the button to cause the transmitter 10 to transmit a carrier (RF or infrared) modulated by "tone pulses" TP and data bits DB shown in FIG. 2.
  • Those signals consist of a “wake-up signal”, first "burst” of toneinstalles at a particular audio frequency and a command, a digital word of data bits.
  • Pressing the button activates a tone-generator 10.2, connected to an RF/digital output 10.3 that produces the modulated carrier RF which is applied to an antenna 10.4.
  • the modulated carrier RF comprising the toneinstalles TP and data bits DB in
  • FIG. 2 is transmitted to a remote receiver 12, associated with the vehicle and powered by the vehicle's battery 14.
  • the carrier RF is received by an antenna 12 and applied to a super regenerative receiver 14 that demodulates the carrier RF producing, on the line 12.2, the two signals TP and DB (one audio pulses at frequency F of the tone pulses TP and the other a "pulse width" modulated digital word with the data characteristics of the data bits of signal DB where a zero is distinguished from a one (zero is "0" and one is " 1 ”) by the duty cycle.
  • the signal TP is applied to a tone decoder 12.3, which is responsive to signal TP having the correct audio frequency and number ofinstalles to provide an output "wake-up" signal SIG. 1 on the line 12.31.
  • the wake-up signal is applied to a signal processor 12.4. which controls a switch SW that applies power to a data amplifier 12.6 in response to the wake-up signal, which the decoder only produces when N pulses at frequency F are detected.
  • the processor includes a microprocessor 12.6 that begins a command detection routine when the wake-up signal disappears (when the last pulse of the N + X pulses in signal TP disappears), and if the code is correct, the command is carried out, e.g. the doors are iocked or unlocked.
  • the data amplifier 20 though shown as a separate item, should be viewed as part of the signal processor "system" 18, but receives power separately from the battery.
  • the data amplifier 20 provides the signal DB to the processor I/O section on the line 20.1 as a signal DATA.
  • the processor initiates a decode routine of the signal DATA and sends a signal SIG. 2 to an alarm system 22 that controls the door locks 24.
  • the function associated with the command DB is completed (e.g. the door locks are latched or unlatched, the microprocessor again goes into its sleep mode; the power to the data amplifier and the microprocessor is removed by operating switch SW.

Abstract

A keyless entry system for a vehicle such as an automobile. A signal processor (18) can power down processor operating sections such as a data amplifier (12.6) to conserve battery power. The power down sequence takes place after a function is performed in response to an instruction from a hand held transmitter (10). The power up sequence is initiated by transmitting to the processor an encoded signal (N) instructing the processor to power up. A data signal (DB) follows the power-up signal and causes the processor to initiate a function, such as unlocking doors. The processor only initiates this function after the power-up signal disappears. The power-up signal consists of a plurality of tone encoded pulses (TP). A tone decoder decodes these pulses and an instruction signal (DB) from a demodulated electromagnetic signal.

Description

Description
Power Saving Remote Keyless Entry
Technical Field This invention relates to remotely controlled systems for vehicles, such as automobile keyless entry systems.
Background Art
Remotely controlled ("keyless") security systems are becoming increasingly popular in automobiles. These systems typically use a small key chain transmitter. The operator presses a button sending a command as a transmitted coded electromagnetic signal using an infrared or RF carrier. The signal is received at a receiver in the vehicle. At the receiver, a signal processor interprets the decoded information and causes the command function to take place, such as unlocking the doors and providing an audible signal heard (a "chirp") audible some distance away from the vehicle, confirming that the command has been received and completed.
The receiver and the processor are always in a full power stand-by condition waiting for the command, creating considerable battery drainage, especially if a vehicle is parked for a length of time in colder climates, where available battery power is significantly reduced by lower temperatures. A driver, away for several weeks may return to the vehicle finding a dead battery caused by this continuous power drain in the otherwise "de-powered" vehicle, except perhaps for the clock, although clocks usually blank the A splay when the vehicle is parked to save power. Summary of the Invention
According to the present invention, portions of the receiver are
"powered down" (a "sleep mode") after security functions are carried out, for example, after the doors are locked. When the user presses the remote transmit, coded signal is transmitted, causing the signal receiver to power-up ("wake up"). It then accepts the coded command.
According to the present invention, the signal processor waits until the power-up signal is removed before responding to a command.
According to one aspect of the invention, the power-up signal, which proceeds the alarm inactivation signal, comprises a plurality of tone coded pulses. The receiver contains a tone decoder that responds only to particular received pulses. The frequency of the transmitted pulses corresponds to the detection frequency of the decoder and a specified number of pulses must be received. The decoder produces a control signal when those conditions are satisfied. The control signal causes the battery to power the powered down portions of the receiver.
According to another aspect of the invention, thus the receiver goes to sleep after the command is completed.
According to another aspect of the invention, the last tone pulse (last pulse in the "wake-up signal") initializes a microprocessor routine that interprets the digital command following the wake-up signal.
Brief Description of the Drawings
FIG. 1 is a functional block diagram of a keyless entry system embodying the present invention. FIG. 2 is a time graph showing the wake-up and command signals. Best Mode for Carrying Out the Invention
In FIG. 1, a portable remote-control transmitter 10 contains a transmit button 10.1. A user presses the button to cause the transmitter 10 to transmit a carrier (RF or infrared) modulated by "tone pulses" TP and data bits DB shown in FIG. 2. Those signals consist of a "wake-up signal", first "burst" of tone puises at a particular audio frequency and a command, a digital word of data bits. Pressing the button activates a tone-generator 10.2, connected to an RF/digital output 10.3 that produces the modulated carrier RF which is applied to an antenna 10.4. The modulated carrier RF. comprising the tone puises TP and data bits DB in
FIG. 2, is transmitted to a remote receiver 12, associated with the vehicle and powered by the vehicle's battery 14. The carrier RF is received by an antenna 12 and applied to a super regenerative receiver 14 that demodulates the carrier RF producing, on the line 12.2, the two signals TP and DB (one audio pulses at frequency F of the tone pulses TP and the other a "pulse width" modulated digital word with the data characteristics of the data bits of signal DB where a zero is distinguished from a one (zero is "0" and one is " 1 ") by the duty cycle.
The signal TP is applied to a tone decoder 12.3, which is responsive to signal TP having the correct audio frequency and number of puises to provide an output "wake-up" signal SIG. 1 on the line 12.31. The wake-up signal is applied to a signal processor 12.4. which controls a switch SW that applies power to a data amplifier 12.6 in response to the wake-up signal, which the decoder only produces when N pulses at frequency F are detected. As discussed below, the processor includes a microprocessor 12.6 that begins a command detection routine when the wake-up signal disappears (when the last pulse of the N + X pulses in signal TP disappears), and if the code is correct, the command is carried out, e.g. the doors are iocked or unlocked.
- 3 - The data amplifier 20, though shown as a separate item, should be viewed as part of the signal processor "system" 18, but receives power separately from the battery. The data amplifier 20 provides the signal DB to the processor I/O section on the line 20.1 as a signal DATA. When the signal DATA is received, the processor initiates a decode routine of the signal DATA and sends a signal SIG. 2 to an alarm system 22 that controls the door locks 24. Once the function associated with the command DB is completed (e.g. the door locks are latched or unlatched, the microprocessor again goes into its sleep mode; the power to the data amplifier and the microprocessor is removed by operating switch SW.
With the benefit of the foregoing description, one skilled in the art may make modifications in whole or in part through the embodiment of the invention that has been described with departing from the true scope and spirit of the invention embraced by the claims that follow.

Claims

Claims
1. A remote control security system, characterized by: a portable transmitter comprising means for transmitting a signal comprising a code of finite duration preceding a data signal for performing a security function; a battery powered receiver comprising means for receiving said signal, means for detecting said code and said data signal, first control means for initiating said security function in response to said data signal, second control means for providing a first signal to power said first control means in response to said code and discontinuing said first signal after said security function is performed.
2. The invention described in claim 1 further characterized in that: said code comprises N audible tone pulses of finite duration and said second control means comprises a tone decoder that provides an output signal in response to said tones.
3. The invention described in claim 2 further characterized in that said commanded function is identified by a duty cycle of pulses in said data signal and said first control means determines said duty cycle with reference to the last one of said N tone pulses.
4. The invention described in claim 3 further characterized in that said first control means comprises a signal processor having a clock and a data amplifier, said clock and said data amplifier operating from the battery in response to said first signal and being unpowered when said first signal is absent and said clock is triggered by said last tone pulse.
5. A method of battery conservation in a vehicle having a remotely accessed security control system comprising a signal processor, characterized by the steps of: putting sections of the signal processor in a powered down state after a function is performed by the control system; remotely transmitting a signal that contains a coded instruction to power-up said sections and a coded instruction to perform a commanded security function; and waiting until said coded instruction is discontinued to decode said instruction and perform said commanded function.
6. The invention described in claim 5 further characterized in that said sections includes a data amplified and processor clock.
7. The invention described in claim 6 further characterized in that said coded instruction comprises a plurality of tone coded pulses preceding said commanded instruction and said commanded instruction is decoded with reference to the last of said tone encoded pulses.
PCT/US1993/005394 1992-06-08 1993-06-08 Power saving remote keyless entry WO1993025987A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP6501632A JPH06509899A (en) 1992-06-08 1993-06-08 Power saving remote keyless entry
EP19930914408 EP0598107A4 (en) 1992-06-08 1993-06-08 Power saving remote keyless entry.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US89547692A 1992-06-08 1992-06-08
US895,476 1992-06-08

Publications (1)

Publication Number Publication Date
WO1993025987A1 true WO1993025987A1 (en) 1993-12-23

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1993/005394 WO1993025987A1 (en) 1992-06-08 1993-06-08 Power saving remote keyless entry

Country Status (3)

Country Link
EP (1) EP0598107A4 (en)
JP (1) JPH06509899A (en)
WO (1) WO1993025987A1 (en)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0785325A1 (en) * 1996-01-20 1997-07-23 DIEHL GMBH & CO. Lock activated by an identity carrier
WO1997042385A1 (en) * 1996-05-07 1997-11-13 United Technologies Automotive, Inc. A wake-up detector system
DE19635279A1 (en) * 1996-08-30 1998-03-12 Siemens Ag Light (IR) and HF signal transmission method esp. for light and HF signals in vehicle anti-theft device
EP0873920A2 (en) * 1997-04-23 1998-10-28 Code Alarm, Inc. Communications system
FR2764419A1 (en) * 1997-06-10 1998-12-11 Sagem METHOD FOR MANAGING A REMOTE CONTROL RECEIVER
FR2770925A1 (en) * 1997-11-12 1999-05-14 Sagem METHOD FOR TRANSMITTING REMOTE CONTROLS
WO2000004517A1 (en) * 1998-07-17 2000-01-27 Leopold Kostal Gmbh & Co. Kg Method for switching on an electrically operated current-consuming component, and electronic circuit configuration
GB2351618A (en) * 1999-04-20 2001-01-03 Siemens Ag Power saving switch circuit
AU743933B2 (en) * 1998-07-20 2002-02-07 Robert Bosch Gmbh An entry system
DE19939365C2 (en) * 1999-08-19 2002-10-24 Siemens Ag Method and arrangement for identifying a mobile station belonging to a base station
WO2003062026A1 (en) * 2002-01-23 2003-07-31 Daimlerchrysler Ag Locking system, in particular for a motor vehicle
US7254725B2 (en) 2002-08-30 2007-08-07 Siemens Aktiengesellschaft Method for the power-saving control of a receiving device, in particular for an access control system for an automobile, and a corresponding receiving device
DE10056533B4 (en) * 2000-11-15 2016-12-22 Hella Kgaa Hueck & Co. Electronic vehicle locking system of a motor vehicle

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8531268B2 (en) 2008-05-15 2013-09-10 Lear Corporation Passive entry system for an automotive vehicle

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US4847614A (en) * 1986-10-29 1989-07-11 Wilhelm Ruf Kg Electronic remote control means, especially for centrally controlled locking systems in motor vehicles
US5109221A (en) * 1987-05-21 1992-04-28 Trw Inc. Remote control system for door locks
US5115236A (en) * 1987-11-18 1992-05-19 U.S. Philips Corporation Remote control system using a wake up signal

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DE2253859A1 (en) * 1972-11-03 1974-05-09 Telefunken Fernseh & Rundfunk SYSTEM FOR REMOTE CONTROL OF AN ELECTRICAL DEVICE

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Publication number Priority date Publication date Assignee Title
US4847614A (en) * 1986-10-29 1989-07-11 Wilhelm Ruf Kg Electronic remote control means, especially for centrally controlled locking systems in motor vehicles
US5109221A (en) * 1987-05-21 1992-04-28 Trw Inc. Remote control system for door locks
US5115236A (en) * 1987-11-18 1992-05-19 U.S. Philips Corporation Remote control system using a wake up signal

Non-Patent Citations (1)

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Title
See also references of EP0598107A4 *

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0785325A1 (en) * 1996-01-20 1997-07-23 DIEHL GMBH & CO. Lock activated by an identity carrier
WO1997042385A1 (en) * 1996-05-07 1997-11-13 United Technologies Automotive, Inc. A wake-up detector system
DE19635279A1 (en) * 1996-08-30 1998-03-12 Siemens Ag Light (IR) and HF signal transmission method esp. for light and HF signals in vehicle anti-theft device
DE19635279C2 (en) * 1996-08-30 2003-10-02 Siemens Ag Method for sending and receiving light and radio frequency signals
EP0873920A3 (en) * 1997-04-23 2000-05-24 Code Alarm, Inc. Communications system
EP0873920A2 (en) * 1997-04-23 1998-10-28 Code Alarm, Inc. Communications system
FR2764419A1 (en) * 1997-06-10 1998-12-11 Sagem METHOD FOR MANAGING A REMOTE CONTROL RECEIVER
EP0884706A1 (en) * 1997-06-10 1998-12-16 Sagem Sa Method for managing a remote control receiver
FR2770925A1 (en) * 1997-11-12 1999-05-14 Sagem METHOD FOR TRANSMITTING REMOTE CONTROLS
WO2000004517A1 (en) * 1998-07-17 2000-01-27 Leopold Kostal Gmbh & Co. Kg Method for switching on an electrically operated current-consuming component, and electronic circuit configuration
AU743933B2 (en) * 1998-07-20 2002-02-07 Robert Bosch Gmbh An entry system
GB2351618A (en) * 1999-04-20 2001-01-03 Siemens Ag Power saving switch circuit
DE19939365C2 (en) * 1999-08-19 2002-10-24 Siemens Ag Method and arrangement for identifying a mobile station belonging to a base station
US6754513B1 (en) 1999-08-19 2004-06-22 Siemens Aktiengesellschaft Method and configuration for identification of a mobile station associated with a base station
DE10056533B4 (en) * 2000-11-15 2016-12-22 Hella Kgaa Hueck & Co. Electronic vehicle locking system of a motor vehicle
WO2003062026A1 (en) * 2002-01-23 2003-07-31 Daimlerchrysler Ag Locking system, in particular for a motor vehicle
US6963794B2 (en) 2002-01-23 2005-11-08 Daimlerchrysler Ag Locking system for a motor vehicle
US7254725B2 (en) 2002-08-30 2007-08-07 Siemens Aktiengesellschaft Method for the power-saving control of a receiving device, in particular for an access control system for an automobile, and a corresponding receiving device
DE10240137B4 (en) * 2002-08-30 2009-01-15 Continental Automotive Gmbh Method for power-saving control of a receiving device, in particular for an access control system for a motor vehicle, and corresponding receiving device

Also Published As

Publication number Publication date
EP0598107A1 (en) 1994-05-25
JPH06509899A (en) 1994-11-02
EP0598107A4 (en) 1994-06-29

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