Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02D—CONTROLLING COMBUSTION ENGINES
  • F02D41/00—Electrical control of supply of combustible mixture or its constituents
  • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
  • F02D41/26—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor
• • 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
  • G07C3/00—Registering or indicating the condition or the working of machines or other apparatus, other than vehicles
• • 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
  • G07C5/00—Registering or indicating the working of vehicles
  • G07C5/08—Registering or indicating performance data other than driving, working, idle, or waiting time, with or without registering driving, working, idle or waiting time
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02D—CONTROLLING COMBUSTION ENGINES
  • F02D2200/00—Input parameters for engine control
  • F02D2200/50—Input parameters for engine control said parameters being related to the vehicle or its components
  • F02D2200/501—Vehicle speed
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02D—CONTROLLING COMBUSTION ENGINES
  • F02D41/00—Electrical control of supply of combustible mixture or its constituents
  • F02D41/22—Safety or indicating devices for abnormal conditions
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02D—CONTROLLING COMBUSTION ENGINES
  • F02D41/00—Electrical control of supply of combustible mixture or its constituents
  • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
  • F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
  • F02D41/2425—Particular ways of programming the data
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02D—CONTROLLING COMBUSTION ENGINES
  • F02D41/00—Electrical control of supply of combustible mixture or its constituents
  • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
  • F02D41/26—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor
  • F02D41/266—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor the computer being backed-up or assisted by another circuit, e.g. analogue

Definitions

• the invention relates to a method for storing information concerning a malfunction of a device.
• the invention finds particular application for the diagnosis of a failure of a device (for example a powertrain of the vehicle) in a motor vehicle, to facilitate the repair of the faulty device.
• Modern motor vehicles use on-board computers to control many electrical or mechanical devices, such as for controlling an engine injection system, for controlling an automatic or robotic gearbox, etc. .
• these computers also include means for implementing various methods of electrical or functional diagnosis.
• the computer stores in a non-volatile memory information relating to the detected fault; this information notably comprises a code associated with the detected fault, and possibly values of parameters characteristic of the operation of the device, also called context data.
• Context data can be generic, that is, identical for all the faults monitored, or specific to a fault considered; in this case they may be different for different defects.
• the speed reference and the value of the speed measured during the detection of the fault are stored.
• the stored information is intended to help the subsequent repairer by providing additional information on the conditions in which the fault has been detected.
• the context data is recorded only at the first occurrence of the fault. It is therefore impossible to know whether the conditions recorded correspond really to particular conditions in which the defect occurs regularly, or simply to the "arbitrary" conditions that prevailed during the fortuitous appearance of the defect. For example, for an electrical fault where the engine speed recorded at the first occurrence of the defect is 2500 rpm, nothing allows the repairer to know if it is a permanent defect appeared for the first time. times at 2500 rpm, or an intermittent fault only occurring at a speed close to 2500 rpm and which would be due for example to a phenomenon of resonance.
• the context data are stored at each occurrence of the fault that they characterize, which facilitates the diagnosis.
• the publication US 2004/002810 discloses a method for detecting errors relating to a malfunction of a device, recording operational data, storing the data, retrieving the data from a computer, and displaying the data. indicating an error.
• This method involves keeping a history of maximum and minimum values. The set of data is thus stored in memory at first, to be processed in a second time.
• the object of the invention is to propose a new method for storing information relating to a defect, which does not have the drawbacks of known methods. More specifically, the object of the invention is to propose a new storage method, which makes it possible to provide exhaustive information for a future diagnosis of the fault, while limiting the overall volume of stored information.
• the update phase may also comprise the step E12, performed at the occurrence of the fault and consisting of a repetition of the step E11 for each characteristic parameter of the device in operation.
• the method thus makes it possible to memorize minimum and maximum values for several characteristic parameters of the device.
• the update phase is repeated at each occurrence of the fault.
• the initialization phase thus makes it possible on the one hand to memorize a precise "image" of a fault occurrence, and on the other hand to initialize the minimum and maximum values of each parameter and the number of occurrence of the fault.
• the method according to the invention is particularly useful for storing information concerning a malfunction of a device such as a powertrain in a vehicle.
• the invention is particularly interesting for the diagnosis of intermittent defects, that is to say which do not last, but which reproduce several times in time.
• a fault is detected when, in the absence of intervention of the driver of the vehicle, the speed is always different from the set speed after a time T.
• the detection of the defect is carried out by a comparator which compares the speed measured by a sensor to the set speed imposed by the driver.
• the parameters of the regulating device relevant for the identification and the repair of the defect are the temperature in the casing of the regulating device (the electronic components of the device do not work or harm outside a range normal operation) and vehicle speed (the control loop is not or poorly effective outside a specified speed range).
• the current value of the housing temperature and the motor speed are stored as reference values: these reference values define an accurate image of the device at the moment of appearance of the defect, which image will be preserved throughout the process.
• the minimum value and the maximum value of the temperature are initialized with the current temperature, and the minimum value and the maximum value of the speed at the current value. We thus have first minimum / maximum values of the parameters, which can be updated later.
• a number of occurrences is initialized to one.
• this number is initialized to one when the fault disappears, in the example when the comparator detects that the speed is sufficiently close to the set speed, to 1% for example.
• Initializing the number of occurrences means that there has been a defect, which has disappeared. Recall that the method of the invention is intended to record the conditions of occurrence of an intermittent defect, that is to say non-permanent but which is repeated.
• step E11 the minimum and maximum values stored for the temperature of the case are updated, if necessary, that is to say if the current value of the temperature is less than the value minimum or greater than the maximum value previously stored.
• step E12 the minimum and maximum values stored for the motor speed are updated, if necessary, that is, if the current value of the speed is less than the minimum value or greater than the minimum value. maximum value previously stored.
• step E13 the number of occurrences is incremented by one.
• this number is initialized to one when the fault disappears, for the same reasons as above.
• the updating phase is then repeated as many times as necessary, at each new occurrence of the defect.
• the invention has been developed for a control device of the powertrain of a motor vehicle. But it can very easily be extended to any electronic computer provided with means for detecting a malfunction of a device and means for storing information relating to the appearance of the detected fault.
• the monitored device may also be for example a control device of a braking system, a speed control device, a temperature control device, etc.
• the method according to the invention combines the advantages of the prior solutions, and avoids their disadvantages.
• the implementation of the method according to the invention leads to a 3-fold increase in the capacity of the non-volatile memory area of the computer allocated to the storage of the context data of the defect.
• this multiplication is largely acceptable.
• the implementation of the method according to the invention makes it possible, on the one hand, to limit the size necessary to the minimum necessary. of memory used, and secondly to keep all the wealth of information stored during the use of the system. Indeed, in the previous solution, the storage of the data necessarily stopped after m detections of the failure (limitation due to the size of the memory). In contrast, in the invention, the data are updated at each new occurrence of the defect, regardless of the number of occurrences of the defect, and this until its repair.

Landscapes

• Engineering & Computer Science (AREA)
• General Physics & Mathematics (AREA)
• Physics & Mathematics (AREA)
• General Engineering & Computer Science (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Computer Hardware Design (AREA)
• Microelectronics & Electronic Packaging (AREA)
• Testing And Monitoring For Control Systems (AREA)
• Combined Controls Of Internal Combustion Engines (AREA)
• Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
• Control Of Transmission Device (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=36613511

Family Applications (1)

Country Status (7)

Families Citing this family (8)

Family Cites Families (17)

• 2005
  • 2005-12-14 FR FR0512640A patent/FR2894695B1/fr not_active Expired - Fee Related
• 2006
  • 2006-11-29 US US12/097,270 patent/US7801652B2/en not_active Expired - Fee Related
  • 2006-11-29 JP JP2008545051A patent/JP2009519420A/ja active Pending
  • 2006-11-29 EP EP06842063.7A patent/EP1960652B1/fr active Active
  • 2006-11-29 BR BRPI0619885-6A patent/BRPI0619885A2/pt not_active IP Right Cessation
  • 2006-11-29 WO PCT/FR2006/051252 patent/WO2007068836A1/fr active Application Filing
  • 2006-11-29 KR KR1020087014178A patent/KR20080084952A/ko not_active Application Discontinuation

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