EP0894188B1 - Procede de reglage du capteur de position d'une pompe d'injection - Google Patents
Procede de reglage du capteur de position d'une pompe d'injection Download PDFInfo
- Publication number
- EP0894188B1 EP0894188B1 EP97921885A EP97921885A EP0894188B1 EP 0894188 B1 EP0894188 B1 EP 0894188B1 EP 97921885 A EP97921885 A EP 97921885A EP 97921885 A EP97921885 A EP 97921885A EP 0894188 B1 EP0894188 B1 EP 0894188B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- position sensor
- sensor
- signal
- load lever
- regulating
- 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.)
- Expired - Lifetime
Links
Images
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 current invention relates more precisely to the adjustment of the position sensor fitted to the control shaft a fuel injection pump for an engine internal combustion and compression ignition fitted to a motor or road vehicle.
- the injection pump fuel from a compression ignition engine fitted to a motor or road vehicle has a pump flow control shaft which is rotatably mounted about an axis geometric which is fixed relative to the structure of the pump.
- the rotation control of the shaft control is ensured by means of a load lever which is linked in rotation to the tree and which is therefore mounted articulated around the geometric axis at near 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 injection pump drive shaft such as that a resistive sensor or potentiometer requires set this so that at a value predetermined electrical signal sent by the position sensor to the electronic device of control, matches information quantity of fuel injected, information directly operated by electronic circuits and appropriate microcontroller software.
- a resistive sensor or potentiometer requires set this so that at a value predetermined electrical signal sent by the position sensor to the electronic device of control, matches information quantity of fuel injected, information directly operated by electronic circuits and appropriate microcontroller software.
- GB-A-2,049,946 discloses in particular an adjustment method according to which pass on at least two operating points of the fuel injection pump, signals from setting corresponding to these operating are derived from a voltage supply to be picked up by the sensor position; these adjustment signals are compared to a predetermined setpoint signal and according to the respective deviation of the signal we correct the basic setting of the position sensor installation of quantity control fuel injected, by modifying the coefficient amplification of an amplifier.
- the present invention therefore relates to a adjustment method simple to implement which allows to no longer resort to the methods of known setting when replacing the position or after an intervention on the latter.
- the adjustment method according to the invention relates to a position sensor cooperating with the control shaft secured to the load lever of the fuel injection pump of an engine to compression ignition internal combustion intended to equip a motor vehicle, this sensor addressing to an electronic system of controls a signal corresponding to the quantities of fuel injected.
- the method for adjusting the position sensor of an injection pump is characterized in that the signal emitted by this position sensor a coefficient of correction, correction coefficient which is deduced from signals transmitted for the same position load lever, by a position sensor respectively set and this position sensor.
- the adjustment of the position can be operated without any intervention on the latter.
- the coefficient of correction is simply formed by the difference between the two signal values transmitted for the same predetermined position of the load lever, for a position sensor respectively set and this position sensor.
- the characteristics of this sensor so that the signal value issued by it for a predetermined position load lever corresponds to the value of signal emitted in the same predetermined position of the load lever by a position sensor previously settled.
- the adjustment of the position sensor can still be operated in intervening on the latter, but this intervention is then very simple to implement and does not requires no specialized tools.
- the position load lever is obtained by now the load lever against one of stops limiting its travel.
- the values of signal from this position sensor and / or the previously set sensor are stored in registers of a corresponding system memory electronic control.
- the values of signal from this position sensor and / or the previously set sensor are memorized by the electronic control system through a suitable tool that can communicate with the electronic system of control, this tool triggering the operation corresponding learning through the broadcast of a suitable signal.
- the acquisition of the value of the signal sent for a position load lever by the load cell previously set position is made directly at the exit of the vehicle assembly line.
- FIG 1 there is shown so schematic the fuel injection pump 10 an internal combustion engine with ignition by compression, also called diesel, intended for equip a motor or road vehicle.
- This pump 10 conventionally comprises a load lever 14 which controls the flow of fuel injected in acting on a control shaft 12 which pivots around a fixed geometric axis relative to the injection pump body 10.
- the load lever 14 is linked in rotation to tree 12 in the vicinity of one of its axial ends, while its other end is connected by a cable 11 for controlling the flow of the injection pump, to the accelerator pedal of the vehicle (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 point engine operating at full load (foot background). The movement of the load lever 14 enters these two stops is followed by a position 13 coupled to the injection pump 10.
- the adjustable stops are illustrated in the form of adjusting screws respectively 15 and 16.
- Such a sensor 13 can operate according to different principles, it can for example be an inductive, capacitive or resistive sensor. In the following description, we will consider that this is a resistive sensor and more particularly a rotary potentiometer 13.
- the potentiometer 13 has the function of provide a signal representative of the position of the control shaft 12 or the load lever 14 which is integral to it, and therefore of the quantity of fuel injected.
- This signal Vp is sent to a electronic engine control system 7 which controls the fuel injection system or still specific functions such as the exhaust gas recirculation (EGR - exhaust gas recirculation) or the ignition advance, at from this engine load information.
- EGR - exhaust gas recirculation exhaust gas recirculation
- ignition advance at from this engine load information.
- potentiometer 13 should be provide a carefully tuned signal whatever be the manufacturing tolerances affecting this potentiometer and the injection pump 10 used. Different methods exist to operate such setting, we 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 includes in particular a central unit CPU, RAM, ROM ROM and EEPROM, analog-to-digital converters A / D, and different input interfaces and exit. So it receives different signals related to engine operation (load, speed, water temperature, etc.), and peripheral organs, performs operations in using appropriate processing software and generates output signals to destination including fuel injectors or EGR valve, etc.
- the electronic system of motor control 7 determines the opening of the valve to obtain the desired EGR rate, for each condition of engine operation, depending on a pre-established mapping on test benches and installed in one of its memories.
- This process aims to limit the heavy pump potentiometer adjustment operations 10, at the only initial setting.
- a suitable tool 8 such as a diagnostic tool
- the process is based on memorization in the system non-volatile EEPROM memory motor control electronics 7, 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 resting against the stop full load 16.
- This initial storage is performed in specific conditions, i.e. once the potentiometer has been correctly adjusted according to a known method, for example on a test bench fuel pump.
- the electronic engine control system 7 has at least two separate addresses in EEPROM memory: A0 and A1 whose contents are respectively marked a0, a1 and which have been initialized to 0.
- a "settled" learning request is triggered after the installation of pump 10 and the potentiometer setting then equipping this last. This request is triggered for example automatically after a delay when first power-up of the electronic system motor control 7, or even manually at from an adapted tool 8 that can interact with the electronic engine control system 7, a such a tool can for example be integrated into a diagnostic tool.
- the electronic engine control system 7 then acquires the voltage Vpa of the initial potentiometer, the load lever 14 being so in a predetermined position for example in support on the idle stop 15.
- This acquisition may be accompanied by hardware filtering (hardware) or software (software).
- Vp + (a0 - a1) where 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 (“set” learning) is carried out at the end of the vehicle chain or during assembly a new pump whose potentiometer has been previously settled.
- Vpa the value of the potentiometer maintaining the position of the lever load 14 in its predetermined position learning (pressing against the stop idle 15).
- this acquisition is operated later, for example before a intervention on potentiometer 13 (or the pump 10) insofar as it can always supply a valid voltage and set on point learning.
- this acquisition is operated later during a possible intervention on the electronic system of motor control 7 or after its replacement.
- This last adjustment process requires so only to have a specific address A0 in the EEPROM memory of the electronic system motor control 7 and operate a learning process "set" as defined above to store the Vpa value 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)
Description
- la figure 1 est une vue schématique de l'installation pour la mise en oeuvre du procédé de réglage selon l'invention.
Claims (8)
- Procédé de réglage du capteur de position (13) équipant l'arbre de commande (12) solidaire du levier de charge (14) de la pompe d'injection (10) d'un moteur à combustion interne à allumage par compression destiné à équiper un véhicule automobile, ledit capteur (13) adressant à un système électronique de contrôle (7) un signal (Vp) correspondant aux quantités de carburant injectées, caractérisé en ce qu'on applique au signal (Vp) émis par ledit capteur (13) un coefficient de correction (a0 - a1), ledit coefficient de correction (a0 - a1) étant déduit des signaux (Vpa,Vpa') émis pour une même position prédéterminée du levier de charge (14) par respectivement un capteur de position préalablement réglé et ledit capteur de position (13).
- Procédé de réglage du capteur de position (13) selon la revendication 1, caractérisé en ce que ledit coefficient de correction (a0-a1) est formé par la différence entre les deux valeurs (a0,al) du signal émis pour une même position prédéterminée du levier de charge (14) par respectivement ledit capteur de position préalablement réglé et ledit capteur de position (13).
- Procédé de réglage du capteur de position (13) équipant l'arbre de commande (12) solidaire du levier de charge (14) de la pompe d'injection (10) d'un moteur à combustion interne à allumage par compression destiné à équiper un véhicule automobile, ledit capteur (13) adressant à un système électronique de contrôle (7) un signal (Vp) correspondant aux quantités de carburant injectées, caractérisé en ce qu'on modifie les caractéristiques dudit capteur (13) de façon que la valeur du signal (Vpa') émis par ledit capteur (13) pour une position prédéterminée du levier de charge (14) corresponde à la valeur (a0) du signal (Vpa) émis dans la même position prédéterminée du levier de charge (14) par un capteur de position préalablement réglé.
- Procédé de réglage du capteur de position (13) selon l'une quelconque des revendications 1 à 3, caractérisé en ce que ladite position prédéterminée du levier de charge (14) est obtenue en maintenant ledit levier de charge (14) contre l'une des butées (15,16) limitant sa course.
- Procédé de réglage du capteur de position (13) selon l'une quelconque des revendications 1 à 4, caractérisé en ce que lesdites valeurs (a0;a1) du signal émis par ledit capteur de position préalablement réglé et/ou ledit capteur de position (13) sont stockées dans des registres (A0;A1) d'une mémoire correspondante dudit système électronique de contrôle (7).
- Procédé de réglage du capteur de position (13) selon l'une quelconque des revendications 1 à 5, caractérisé en ce que lesdites valeurs (a0;a1) du signal émis par ledit capteur de position préalablement réglé et/ou ledit capteur de position (13) sont mémorisées par ledit système électronique de contrôle (7) par l'intermédiaire d'un outil adapté (8) pouvant communiquer avec le système électronique de contrôle (7), ledit outil déclenchant l'opération d'apprentissage correspondante grâce à l'émission d'un signal adapté.
- Procédé de réglage du capteur de position (13) selon l'une quelconque des revendications 1 à 6, caractérisé en ce que l'acquisition de la valeur du signal (Vpa) émis pour une position prédéterminée du levier de charge (14) par ledit capteur de position préalablement réglé est faite directement à la sortie de la chaíne de montage du véhicule.
- Procédé de réglage du capteur de position (13) selon l'une quelconque des revendications 1 à 7, caractérisé en ce que ledit capteur de position est formé par un capteur résistif tel qu'un potentiomètre rotatif (13).
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9605291 | 1996-04-26 | ||
FR9605291A FR2748061B1 (fr) | 1996-04-26 | 1996-04-26 | Procede de reglage du capteur de position d'une pompe d'injection |
PCT/FR1997/000743 WO1997041339A1 (fr) | 1996-04-26 | 1997-04-25 | Procede de reglage du capteur de position d'une pompe d'injection |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0894188A1 EP0894188A1 (fr) | 1999-02-03 |
EP0894188B1 true EP0894188B1 (fr) | 1999-12-29 |
Family
ID=9491624
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97921885A Expired - Lifetime EP0894188B1 (fr) | 1996-04-26 | 1997-04-25 | Procede de reglage du capteur de position d'une pompe d'injection |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0894188B1 (fr) |
DE (1) | DE69701037T2 (fr) |
FR (1) | FR2748061B1 (fr) |
WO (1) | WO1997041339A1 (fr) |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3011595A1 (de) * | 1980-03-26 | 1981-10-01 | Robert Bosch Gmbh, 7000 Stuttgart | Korrektureinrichtung fuer ein kraftstoffmesssystem bei einer brennkraftmaschine |
JPS60228746A (ja) * | 1984-04-24 | 1985-11-14 | Nippon Denso Co Ltd | 燃料噴射量制御装置 |
DE3447629A1 (de) * | 1984-12-28 | 1986-07-03 | Fujitsu Ltd., Kawasaki, Kanagawa | Signalverarbeitungssystem fuer einen kraftfahrzeug-beschleunigungsfuehler |
US4852535A (en) * | 1987-10-01 | 1989-08-01 | Steyr-Daimler-Puch Ag | Automatic control method for moving a final control element |
DE3743770C2 (de) * | 1987-12-23 | 1996-08-08 | Vdo Schindling | Verfahren zur Steuerung der Leistung eines Dieselmotors |
DE3909905A1 (de) * | 1989-03-25 | 1990-09-27 | Bosch Gmbh Robert | Verfahren zur bestimmung wenigstens einer endstellung einer verstelleinrichtung in einem kraftfahrzeug |
JPH02298645A (ja) * | 1989-05-10 | 1990-12-11 | Kubota Corp | 電子ガバナ |
-
1996
- 1996-04-26 FR FR9605291A patent/FR2748061B1/fr not_active Expired - Fee Related
-
1997
- 1997-04-25 DE DE69701037T patent/DE69701037T2/de not_active Expired - Fee Related
- 1997-04-25 EP EP97921885A patent/EP0894188B1/fr not_active Expired - Lifetime
- 1997-04-25 WO PCT/FR1997/000743 patent/WO1997041339A1/fr active IP Right Grant
Also Published As
Publication number | Publication date |
---|---|
FR2748061B1 (fr) | 1998-05-22 |
DE69701037T2 (de) | 2000-08-03 |
EP0894188A1 (fr) | 1999-02-03 |
WO1997041339A1 (fr) | 1997-11-06 |
FR2748061A1 (fr) | 1997-10-31 |
DE69701037D1 (de) | 2000-02-03 |
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