WO1997041339A1 - Method for adjusting an injection pump position sensor - Google Patents
Method for adjusting an injection pump position sensor Download PDFInfo
- Publication number
- WO1997041339A1 WO1997041339A1 PCT/FR1997/000743 FR9700743W WO9741339A1 WO 1997041339 A1 WO1997041339 A1 WO 1997041339A1 FR 9700743 W FR9700743 W FR 9700743W WO 9741339 A1 WO9741339 A1 WO 9741339A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- position sensor
- sensor
- signal
- adjusting
- load lever
- Prior art date
Links
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
- F02D41/2406—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
- F02D41/2429—Methods of calibrating or learning
- F02D41/2432—Methods of calibration
-
- 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
- F02D41/2429—Methods of calibrating or learning
- F02D41/2451—Methods of calibrating or learning characterised by what is learned or calibrated
- F02D41/2474—Characteristics of sensors
-
- 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
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2250/00—Engine control related to specific problems or objectives
- F02D2250/16—End position calibration, i.e. calculation or measurement of actuator end positions, e.g. for throttle or its driving actuator
-
- 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
- F02D41/2429—Methods of calibrating or learning
- F02D41/2451—Methods of calibrating or learning characterised by what is learned or calibrated
- F02D41/2464—Characteristics of actuators
- F02D41/2467—Characteristics of actuators for injectors
Definitions
- the present invention relates to a method for adjusting a position sensor.
- the present invention relates more precisely to the adjustment of the position sensor fitted to the control shaft of a fuel injection pump for an internal combustion and compression ignition engine fitted to a motor or road vehicle.
- the fuel injection pump of a compression ignition engine fitted to a motor or road vehicle comprises a pump flow control shaft which is rotatably mounted about a geometric axis which is fixed relative to to the pump structure.
- the control of the control shaft in rotation is ensured by means of a load lever which is linked in rotation to the shaft and which is therefore mounted articulated around the geometric axis in the vicinity of one of its ends. longitudinal, while its other end is secured to a cable for controlling the flow of the pump which is connected to the accelerator pedal of the vehicle.
- a position sensor coupled to the control shaft of the injection pump such as a resistive sensor or potentiometer
- a resistive sensor or potentiometer requires that it be adjusted so that at a predetermined value of the electrical signal sent by the position sensor to the electronic control device, corresponds to the quantity of fuel injected information, information directly used by the electronic circuits and the appropriate software of the microcontroller.
- Various methods of adjusting such a position sensor are known, described in particular in the publications EP-A-335,094 or also GB-A-2,049,946.
- the document GB-A-2,049,946 discloses in particular an adjustment method according to which one passes over at least two operating points of the fuel injection pump, adjustment signals corresponding to these operating points are derived from a supply voltage to be taken by the position sensor; these adjustment signals are compared with a predetermined setpoint signal and, depending on the respective deviation of the signal, the basic adjustment of the position sensor of the installation for controlling the quantity of fuel injected is corrected, by modifying the amplification coefficient d 'an amplifier.
- the present invention therefore relates to an adjustment method that is simple to implement which makes it possible to no longer have recourse to known adjustment methods when replacing the position sensor or after intervention on the latter.
- the adjustment method according to the invention relates to a position sensor cooperating with the control shaft integral with the load lever of the fuel injection pump of an internal combustion compression-ignition engine intended to equip a motor vehicle , this sensor sending a signal to an electronic control system corresponding to the quantities of fuel injected.
- the method for adjusting the position sensor of an injection pump is characterized in that a correction coefficient, correction coefficient which is deduced from the signals transmitted, is applied to the signal emitted by this position sensor. for the same position load lever, by a previously adjusted position sensor and this position sensor respectively.
- the adjustment of the position sensor can be carried out without any intervention on the latter.
- the correction coefficient is simply formed by the difference between the two values of signal emitted for the same predetermined position of the lever. load, respectively by a previously adjusted position sensor and this position sensor.
- the characteristics of this sensor are modified so that the value of the signal emitted by it for a predetermined position of the load lever corresponds to the value of the signal transmitted in the same predetermined position of the load lever by a position sensor previously adjusted.
- the position sensor can still be adjusted by operating on the latter, but this intervention is then very simple to implement and does not require any specialized tools.
- the predetermined position of the load lever is obtained by holding the load lever against one of the stops limiting its travel.
- the values of the signal emitted by this position sensor and / or the sensor previously adjusted are stored in registers of a corresponding memory of the electronic control system.
- the values of the signal emitted by this position sensor and / or the previously adjusted sensor are memorized by the electronic control system. by means of a suitable tool which can communicate with the electronic control system, this tool triggering the corresponding learning operation by means of the emission of a suitable signal.
- FIG. 1 is a schematic view of the installation for the implementation of the adjustment method according to the invention.
- FIG 1 there is shown schematically the fuel injection pump 10 of an internal combustion engine with compression ignition, also called diesel, intended to equip a motor or road vehicle.
- This pump 10 conventionally comprises a load lever 14 which controls the flow rate of the injected fuel by acting on a control shaft 12 which pivots about a geometric axis fixed relative to the body of the injection pump 10.
- the load lever 14 is linked in rotation to the shaft 12 in the vicinity of one of its axial ends, while its other end is connected by a cable 11 for controlling the flow rate of the injection pump, to the pedal vehicle accelerator (not shown).
- This load lever 14 can pivot between two adjustable stops, namely a first stop for engine idling (foot raised) and a second stop corresponding to the engine operating point at full load (foot fully). The movement of the load lever 14 between these two stops is followed by a position sensor 13 coupled to the injection pump 10.
- the adjustable stops are illustrated in the form of adjusting screws 15 and 16 respectively.
- Such a sensor 13 can operate according to different principles, it can for example be an inductive, capacitive or resistive sensor. In the description which follows, it will be considered that it is a resistive sensor and more particularly a rotary potentiometer 13.
- the potentiometer 13 has the function of providing a signal representative of the position of the control shaft 12 or of the load lever 14 which is integral with it, and therefore of the quantity of fuel injected.
- This signal Vp is sent to an electronic engine control system 7 which controls the fuel injection system or even specific functions such as exhaust gas recirculation (EGR - exhaust gas recirculation) or advance to l 'ignition, from this engine load information.
- EGR - exhaust gas recirculation exhaust gas recirculation
- advance to l 'ignition from this engine load information.
- the potentiometer 13 provide a carefully adjusted signal whatever the manufacturing tolerances affecting this potentiometer and the injection pump 10 used. Different methods exist for operating such an adjustment, one can recall for example the methods described in the publications already cited GB-A-2,049,946 or EP-A-335,094.
- the electronic engine control system 7 used notably comprises a central processing unit CPU, RAM memories, ROM and EEPROM memories, analog-digital A / D converters, and various input and output interfaces. It therefore receives various input signals relating to the operation of the engine (load, speed, water temperature, etc.), and of peripheral organs, performs operations using appropriate processing software and generates output signals at destination. including fuel injectors or EGR valve, etc.
- the electronic engine control system 7 determines the opening of the valve to obtain the desired EGR rate, for each operating condition of the engine, as a function a map pre-established on test benches and installed in one of its memories.
- This process aims to limit the heavy adjustment operations of the potentiometer of the pump 10, to the only initial adjustment. Subsequent adjustments, for example after an intervention on potentiometer 13 or else after its replacement by a new potentiometer, no longer require the use of an adapted tool 8 (such as a diagnostic tool) to operate a simple phase data acquisition and this, instead of delicate adjustments to the test bench as is the case with the known adjustment methods according to the prior art, and this without additional device on the injection pump.
- an adapted tool 8 such as a diagnostic tool
- the method is based on the memorization in the non-volatile memory EEPROM of the electronic engine control system 7, of the voltage delivered by the potentiometer initially set in one (or more) predetermined position of the load lever 14, for example pressing against the idle stop 15 or else pressing against the full load stop 16.
- This initial storage is carried out under precise conditions, namely once the potentiometer has been correctly adjusted according to a known method, for example on a fuel pump test bench. Then, when replacing the potentiometer (or during a re-adjustment) it is no longer necessary to repeat the entire adjustment process. It suffices to bring the load lever 14 to the predetermined position chosen and to store in another EEPROM address the voltage produced by the new potentiometer, to then apply in the control strategies concerned by the signal emitted by the new potentiometer 13, an offset or additive correcting coefficient corresponding to the difference between the values supplied by the initial potentiometer and those supplied by the new potentiometer 13.
- the electronic engine control system 7 has at least two separate addresses in the EEPROM memory: AO and Al whose contents are respectively denoted aO, al and which have been initialized to 0.
- a "set" learning request is triggered after the pump 10 has been put in place and the potentiometer is then fitted to the latter.
- This request is triggered, for example, automatically after a time delay when the electronic engine control system 7 is first powered up, or even manually from a suitable tool 8 capable of dialoguing with the electronic engine control system 7, such a tool which can for example be integrated with a diagnostic tool.
- the electronic engine control system 7 acquires the voltage Vpa of the initial potentiometer, the load lever 14 therefore being in a predetermined position for example by pressing on the idle stop 15.
- This acquisition can be accompanied by a hardware (software) or software (software) filtering.
- This new "non-regulated" learning request is triggered by a manual command operated from the tool 8.
- the electronic engine control system 7 acquires the new voltage Vpa 'obtained in the same predefined position of the load lever 14 (pressing on the idle stop).
- This new acquisition can also be accompanied by hardware (hardware) or software (software) filtering.
- Vp + (aO - al) Vp is the current magnitude of the load supplied by the potentiometer 13, so as to have a permanently set value, without having to physically intervene on the potentiometer 13.
- the acquisition of the value Vpa (“adjusted" learning) is carried out at the end of the vehicle chain or even during the mounting of a new pump whose potentiometer has been previously adjusted.
- Vpa the value of the potentiometer
- This last adjustment method therefore only requires having a specific address AO in the EEPROM memory of the electronic engine control system 7 and operating a "set" learning operation as defined above to store the value Vpa at this address.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE69701037T DE69701037T2 (en) | 1996-04-26 | 1997-04-25 | METHOD FOR ADJUSTING THE POSITION SENSOR OF A FUEL INJECTION PUMP |
EP97921885A EP0894188B1 (en) | 1996-04-26 | 1997-04-25 | Method for adjusting an injection pump position sensor |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9605291A FR2748061B1 (en) | 1996-04-26 | 1996-04-26 | METHOD FOR ADJUSTING THE POSITION SENSOR OF AN INJECTION PUMP |
FR96/05291 | 1996-04-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1997041339A1 true WO1997041339A1 (en) | 1997-11-06 |
Family
ID=9491624
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR1997/000743 WO1997041339A1 (en) | 1996-04-26 | 1997-04-25 | Method for adjusting an injection pump position sensor |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0894188B1 (en) |
DE (1) | DE69701037T2 (en) |
FR (1) | FR2748061B1 (en) |
WO (1) | WO1997041339A1 (en) |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4426980A (en) * | 1980-03-26 | 1984-01-24 | Robert Bosch Gmbh | Correction device for a fuel metering system in an internal combustion engine |
JPS60228746A (en) * | 1984-04-24 | 1985-11-14 | Nippon Denso Co Ltd | Fuel injection amount controller |
US4843555A (en) * | 1984-12-28 | 1989-06-27 | Isuzu Motors Limited | Signal processing system for vehicular acceleration sensor |
DE3743770A1 (en) * | 1987-12-23 | 1989-07-06 | Vdo Schindling | Method for controlling the power of a diesel engine |
US4852535A (en) * | 1987-10-01 | 1989-08-01 | Steyr-Daimler-Puch Ag | Automatic control method for moving a final control element |
JPH02298645A (en) * | 1989-05-10 | 1990-12-11 | Kubota Corp | Electronic governor |
US5213078A (en) * | 1989-03-25 | 1993-05-25 | Robert Bosch Gmbh | Method for determining at least one end position of a displacement device in a motor vehicle |
-
1996
- 1996-04-26 FR FR9605291A patent/FR2748061B1/en not_active Expired - Fee Related
-
1997
- 1997-04-25 DE DE69701037T patent/DE69701037T2/en not_active Expired - Fee Related
- 1997-04-25 EP EP97921885A patent/EP0894188B1/en not_active Expired - Lifetime
- 1997-04-25 WO PCT/FR1997/000743 patent/WO1997041339A1/en active IP Right Grant
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4426980A (en) * | 1980-03-26 | 1984-01-24 | Robert Bosch Gmbh | Correction device for a fuel metering system in an internal combustion engine |
JPS60228746A (en) * | 1984-04-24 | 1985-11-14 | Nippon Denso Co Ltd | Fuel injection amount controller |
US4843555A (en) * | 1984-12-28 | 1989-06-27 | Isuzu Motors Limited | Signal processing system for vehicular acceleration sensor |
US4852535A (en) * | 1987-10-01 | 1989-08-01 | Steyr-Daimler-Puch Ag | Automatic control method for moving a final control element |
DE3743770A1 (en) * | 1987-12-23 | 1989-07-06 | Vdo Schindling | Method for controlling the power of a diesel engine |
US5213078A (en) * | 1989-03-25 | 1993-05-25 | Robert Bosch Gmbh | Method for determining at least one end position of a displacement device in a motor vehicle |
JPH02298645A (en) * | 1989-05-10 | 1990-12-11 | Kubota Corp | Electronic governor |
Non-Patent Citations (2)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 010, no. 092 (M - 468) 9 April 1986 (1986-04-09) * |
PATENT ABSTRACTS OF JAPAN vol. 015, no. 073 (M - 1084) 20 February 1991 (1991-02-20) * |
Also Published As
Publication number | Publication date |
---|---|
FR2748061B1 (en) | 1998-05-22 |
DE69701037T2 (en) | 2000-08-03 |
EP0894188A1 (en) | 1999-02-03 |
FR2748061A1 (en) | 1997-10-31 |
EP0894188B1 (en) | 1999-12-29 |
DE69701037D1 (en) | 2000-02-03 |
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