GB2400454A - An ignition signal monitoring system for a vehicle. - Google Patents

An ignition signal monitoring system for a vehicle. Download PDF

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Publication number
GB2400454A
GB2400454A GB0308130A GB0308130A GB2400454A GB 2400454 A GB2400454 A GB 2400454A GB 0308130 A GB0308130 A GB 0308130A GB 0308130 A GB0308130 A GB 0308130A GB 2400454 A GB2400454 A GB 2400454A
Authority
GB
United Kingdom
Prior art keywords
ignition
bus system
signal
vehicle
ecu
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
GB0308130A
Other versions
GB0308130D0 (en
Inventor
Mark Ian Phillips
Mark Leighton Howell
Reza Shokoufandeh
Jonathan Charles Clarke
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TRW Ltd
Original Assignee
TRW Ltd
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 TRW Ltd filed Critical TRW Ltd
Priority to GB0308130A priority Critical patent/GB2400454A/en
Publication of GB0308130D0 publication Critical patent/GB0308130D0/en
Publication of GB2400454A publication Critical patent/GB2400454A/en
Application status is Withdrawn legal-status Critical

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02PIGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P9/00Electric spark ignition control, not otherwise provided for
    • F02P9/002Control of spark intensity, intensifying, lengthening, suppression
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02PIGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P5/00Advancing or retarding ignition; Control therefor
    • F02P5/04Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions
    • F02P5/145Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions using electrical means
    • F02P5/15Digital data processing
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60WCONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W50/00Details of control systems for road vehicle drive control not related to the control of a particular sub-unit, e.g. process diagnostic or vehicle driver interfaces
    • B60W2050/0001Details of the control system
    • B60W2050/0043Signal treatments, identification of variables or parameters, parameter estimation or state estimation
    • B60W2050/0044In digital systems
    • B60W2050/0045In digital systems using databus protocols
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60WCONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W50/00Details of control systems for road vehicle drive control not related to the control of a particular sub-unit, e.g. process diagnostic or vehicle driver interfaces
    • B60W50/02Ensuring safety in case of control system failures, e.g. by diagnosing, circumventing or fixing failures
    • B60W50/029Adapting to failures or work around with other constraints, e.g. circumvention by avoiding use of failed parts
    • B60W2050/0292Fail-safe or redundant systems, e.g. limp-home or backup systems
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/24Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/26Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/24Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/26Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor
    • F02D41/28Interface circuits
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/10Internal combustion engine [ICE] based vehicles
    • Y02T10/40Engine management systems
    • Y02T10/46Engine management systems controlling ignition

Abstract

An arrangement of electronic control units (ECU's) in a vehicle which are connected via a bus system for exchanging data there between. At least one of said ECU's receives the vehicle ignition signal directly and independently of the bus system. A check is conducted to whether the lack of the direct ignition signal at one such ECU is correctly indicative of the ignition being off. Derived from data available in the bus system is an additional signal representative of the ignition status. The ignition status signal is preferably derived from data such as engine RPM, wheel RPM. Preferably a CAN (central area network) bus system is used. The detection of the ignition signal is preferably required for safety, in order to initiate an emergency system shut down when a particular ignition signal detection has not occurred. This safety shut down may be required for an electrohydraulic brake (EHB) system, whereby mechanical breaking is allowed at lower decelerations.

Description

IMPROVEMENTS TO ROAD VEHICLE

BRAKING SYSTEMS.

The present invention relates to electronic control units (ECUs) which are connected via a bus system for exchanging data within the braking system of a road vehicle.

Electronic bus systems generally comprise a bus wire with at least two signal transmission wires, terminating resistors at either end of the transmission wires and a plurality of ECUs which are connected to the signal transmission wires between opposing terminating resistors of the bus wire and are adapted to transmit and receive electric signals via the transmission wires. Such a system can be commonly found in modern road vehicles, where the ECU of the braking system, the engine management system, the body control system etc all communicate via a bus system.

A drawback of a bus system is that it has no redundancy (i.e. even a small defect in the bus wire, e.g. a fracture, may result in the function of the entire system being jeopardised).

It is an object of the present invention to improve the monitoring of the ignition signal (SIGN) which is fed to an ECU, independent from the bus system, in order to obtain a higher reliability of the system.

In accordance with the present invention, there is provided an arrangement of electronic control units (ECUs) in a vehicle which are connected via a bus system for exchanging data therebetween, at least one of said ECUs receiving the vehicle ignition signal directly and independently of the bus system, wherein in order to check whether the lack of the direct ignition signal at one such ECU is correctly indicative of the ignition being off, there is derived from data available in the bus system an additional signal representative of the ignition status.

In some embodiments, said additional signal is derived from the ignition signal fed directly to another of said ECUs and passed to said one such ECU via the bus system.

In other embodiments, said additional signal is derived from data available on the bus system not corresponding directly to an ignition signal.

In one embodiment of the latter arrangement, for example, the additional signal is derived from a detection of information in the bus system indicative of the engine running.

A specific embodiment of the present invention will be hereinafter described by way of example only, with reference to the accompanying drawings in which: Figure 1 is a schematic representation of the ignition signals received by the ECUs; and Figure 2 represents part of the ECU's control algorithm.

CAN is a standardised method of interconnecting ECUs to a system and was developed for the automotive industry. In a CAN system a number of ECUs exchange, in a digital manner, information via a bus wire consisting of a two-wire cable.

Normally each ECU has an independent power supply (URA1T) from that of the bus system. Furthermore, the ignition signal (SIGN) is fed to some ECUs independently of the bus system. Some systems must operate even when the ignition is OFF, which usually indicates that the vehicle is at standstill and the driver is entering, or intends to leave the vehicle, or has already left. For example the ECU of an electric parking brake (EPB) must be operational when the ignition is turned off to hold safely the vehicle at standstill and the ECU of a brake-by-wire system of the type such as an electrohydraulic brake (EHB) or an electromechanical brake (EMB) must be operational in wake-up and stand-by modes respectively, to be able to guarantee brake applications when the ignition is off. The ignition signal (SIGN) is required by some ECUs to maintain normal operation in the absence of the wake-up signal, or to allow different operating modes only when the ignition is turned on. Therefore, the ignition signal (SIGN) is of high relevance for the system safety, which is why it is monitored by the respective ECU.

In the case when the respective ECU does not receive an ignition signal (SIGN), it normally switches down to a failsafe mode and a visible and/or audible warning is given to the driver to indicate to him that the system performance is greatly restricted.

In the case of an electrohydraulic brake (EHB), the system may shut down to an emergency mode, which only allows manual braking at lower decelerations sufficient to fulfill legal regulations.

In the present example of the present system illustrated in Fig. 1, from data which is available already on the bus system, an additional signal (SIGN BUS) representing the ignition status can be derived. The additional signal (SIGN BUS) can be (1), the ignition signal directly fed to another ECU, which is provided on the bus system by that other ECU, or (ii) a plausibility signal derived from data anyhow available on the bus system (e.g. if data on the engine speed is available this can provide positive confirmation that the ignition must be on.) The advantage is that an ECU which directly receives a signal indicating that the ignition is off or detects a fault in the ignition signal (SIGN) can decide depending on the additional signal (SIGN BUS)' whether or not the ignition "really" is turned off, and therefore whether or not the ECU really does need to shut down into an emergency mode. Since then its normal operating mode can be maintained, the reliability of the system is essentially increased. If both signals indicate that the ignition is switched off, the vehicle can operate in a failsafe mode as in currently known systems. This decision making process is displayed in Figure2.

Claims (5)

1. An arrangement of electronic control units (ECUs) in a vehicle which are connected via a bus system for exchanging data therebetwocn, at least one of said ECUs receiving the vehicle ignition signal directly and independently of the bus system, wherein in order to check whether the lack of the direct ignition signal at one such ECU is correctly indicative of the ignition being off, there is derived from data available in the bus system an additional signal representative of the ignition status.
2. An arrangement as claimed in claim 1, wherein said additional signal is derived from the ignition signal fed directly to another of said ECUs and passed to said one such ECU via the bus system.
3. An arrangement as claimed in claim 1, wherein said additional signal is derived from data available on the bus system.
4. An arrangement as claimed in claim 3, wherein said additional signal is derived from a detection of information in the bus system indicative of the engine running.
5. An arrangement of ECUs in a vehicle, substantially as hereinbefore described, with reference to and as illustrated in the accompanying drawings.
GB0308130A 2003-04-09 2003-04-09 An ignition signal monitoring system for a vehicle. Withdrawn GB2400454A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0308130A GB2400454A (en) 2003-04-09 2003-04-09 An ignition signal monitoring system for a vehicle.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0308130A GB2400454A (en) 2003-04-09 2003-04-09 An ignition signal monitoring system for a vehicle.

Publications (2)

Publication Number Publication Date
GB0308130D0 GB0308130D0 (en) 2003-05-14
GB2400454A true GB2400454A (en) 2004-10-13

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Family Applications (1)

Application Number Title Priority Date Filing Date
GB0308130A Withdrawn GB2400454A (en) 2003-04-09 2003-04-09 An ignition signal monitoring system for a vehicle.

Country Status (1)

Country Link
GB (1) GB2400454A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2433791A (en) * 2004-10-22 2007-07-04 Irobot Corp Means of Controlling a Vehicle
US7499775B2 (en) 2004-10-22 2009-03-03 Irobot Corporation System and method for terrain feature tracking
US7499774B2 (en) 2004-10-22 2009-03-03 Irobot Corporation System and method for processing safety signals in an autonomous vehicle
US7499804B2 (en) 2004-10-22 2009-03-03 Irobot Corporation System and method for multi-modal control of an autonomous vehicle
US7499776B2 (en) 2004-10-22 2009-03-03 Irobot Corporation Systems and methods for control of an unmanned ground vehicle
CN102107631A (en) * 2009-12-25 2011-06-29 陕西重型汽车有限公司 Car bus system and control method for emergency driving
US8078338B2 (en) 2004-10-22 2011-12-13 Irobot Corporation System and method for behavior based control of an autonomous vehicle
US8237389B2 (en) 2008-11-12 2012-08-07 Irobot Corporation Multi mode safety control module

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0721064A2 (en) * 1994-12-02 1996-07-10 Nippondenso Co., Ltd. Vehicular controller
JPH08265877A (en) * 1995-03-22 1996-10-11 Toyota Motor Corp Load drive controller
GB2332286A (en) * 1997-07-10 1999-06-16 Luk Getriebe-Systeme Gmbh Device for authorizing an unrestricted operating mode of a vehicle control device in the event of a failure of the ignition signal
EP1020315A1 (en) * 1999-01-14 2000-07-19 Nissan Motor Company, Limited Apparatus and method for automatically controlling vehicular velocity and inter-vehicle distance

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0721064A2 (en) * 1994-12-02 1996-07-10 Nippondenso Co., Ltd. Vehicular controller
JPH08265877A (en) * 1995-03-22 1996-10-11 Toyota Motor Corp Load drive controller
GB2332286A (en) * 1997-07-10 1999-06-16 Luk Getriebe-Systeme Gmbh Device for authorizing an unrestricted operating mode of a vehicle control device in the event of a failure of the ignition signal
EP1020315A1 (en) * 1999-01-14 2000-07-19 Nissan Motor Company, Limited Apparatus and method for automatically controlling vehicular velocity and inter-vehicle distance

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2433791A (en) * 2004-10-22 2007-07-04 Irobot Corp Means of Controlling a Vehicle
GB2433791B (en) * 2004-10-22 2008-05-21 Irobot Corp Systems and Methods for Control of a Vehicle
US7499775B2 (en) 2004-10-22 2009-03-03 Irobot Corporation System and method for terrain feature tracking
US7499774B2 (en) 2004-10-22 2009-03-03 Irobot Corporation System and method for processing safety signals in an autonomous vehicle
US7499804B2 (en) 2004-10-22 2009-03-03 Irobot Corporation System and method for multi-modal control of an autonomous vehicle
US7499776B2 (en) 2004-10-22 2009-03-03 Irobot Corporation Systems and methods for control of an unmanned ground vehicle
US9513634B2 (en) 2004-10-22 2016-12-06 Irobot Corporation System and method for behavior based control of an autonomous vehicle
US7979175B2 (en) 2004-10-22 2011-07-12 Irobot Corporation Systems and methods for control of an unmanned ground vehicle
US8078338B2 (en) 2004-10-22 2011-12-13 Irobot Corporation System and method for behavior based control of an autonomous vehicle
US9110471B2 (en) 2004-10-22 2015-08-18 Irobot Corporation Systems and methods for multi-modal control of a vehicle
US10088845B2 (en) 2004-10-22 2018-10-02 Irobot Corporation System and method for behavior based control of an autonomous vehicle
US8237389B2 (en) 2008-11-12 2012-08-07 Irobot Corporation Multi mode safety control module
CN102107631B (en) * 2009-12-25 2015-07-15 陕西重型汽车有限公司 Car bus system and control method for emergency driving
CN102107631A (en) * 2009-12-25 2011-06-29 陕西重型汽车有限公司 Car bus system and control method for emergency driving

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732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)