EP0795077B1 - Procede et dispositif permettant de surveiller un systeme de dosage de carburant - Google Patents

Procede et dispositif permettant de surveiller un systeme de dosage de carburant Download PDF

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Publication number
EP0795077B1
EP0795077B1 EP96913445A EP96913445A EP0795077B1 EP 0795077 B1 EP0795077 B1 EP 0795077B1 EP 96913445 A EP96913445 A EP 96913445A EP 96913445 A EP96913445 A EP 96913445A EP 0795077 B1 EP0795077 B1 EP 0795077B1
Authority
EP
European Patent Office
Prior art keywords
temperature
pressure
metering system
combustion chamber
internal combustion
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
Application number
EP96913445A
Other languages
German (de)
English (en)
Other versions
EP0795077A1 (fr
Inventor
Gerhard Stumpp
Johannes Locher
Claus Maier
Jürgen Biester
Werner Teschner
Wilhelm Eyberg
Jochen Neumeister
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0795077A1 publication Critical patent/EP0795077A1/fr
Application granted granted Critical
Publication of EP0795077B1 publication Critical patent/EP0795077B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F02D41/22—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
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D41/3809—Common rail control systems
    • F02D41/3827—Common rail control systems for diesel engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
    • F02D35/02—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions
    • F02D35/025—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions by determining temperatures inside the cylinder, e.g. combustion temperatures
    • 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
    • F02D41/221—Safety or indicating devices for abnormal conditions relating to the failure of actuators or electrically driven elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
    • 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
    • F02D2041/224—Diagnosis of the fuel system
    • 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
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/06—Fuel or fuel supply system parameters
    • F02D2200/0602—Fuel pressure
    • 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
    • F02D2250/31—Control of the fuel pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
    • F02D35/02—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions
    • F02D35/023—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions by determining the cylinder pressure
    • 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
    • F02D41/3809—Common rail control systems
    • F02D41/3836—Controlling the fuel pressure

Definitions

  • the invention relates to a method and a device to monitor a fuel metering system according to General terms of the independent claims.
  • Such a method and such a device for Monitoring a fuel metering system are from the US 52 41 933 known. There will be one procedure and one Device for monitoring a high pressure circuit at a Common rail system described. The one described there The device regulates the pressure in the rail. Is that Actuating variable of the pressure control circuit outside of a specifiable one Range, the device detects for errors.
  • US 4 512 307 describes a method in which monitoring is whether the combustion chamber temperature is a certain critical Exceeds the maximum. This maximum value is chosen so that destruction or damage to the Internal combustion engine should be prevented. Monitored the establishment of whether the temperature is a fixed predetermined Value exceeds. A leak or other error in the area of fuel metering can be done with a not recognize such a facility or recognize it very late. This Facility only detects serious errors that are related to can lead to destruction of the internal combustion engine.
  • US 4,466,408 shows a method and an apparatus at which the cylinder pressure is evaluated.
  • the course of the Cylinder pressure during a combustion is with predetermined curves compared. Give way to the saved ones Curves significantly from the actual course of the Combustion chamber pressure decreases, a faulty combustion recognized.
  • the invention has for its object in a Device and a method for monitoring a Fuel metering system of the type mentioned at the outset, if possible to be able to recognize errors safely and easily. This task is by the in the independent claims marked features solved.
  • DE-OS 44 40 700 is a method known in the event of an accident caused by a Airbag sensor is detected, an electromagnetic High pressure regulator on the downstream side of the High pressure line opens completely. This leads to one Pressure drop in the high pressure part of the fuel metering device.
  • FIG. 1 shows a block diagram of the device according to the invention and the Figures 2, 3 and 4 each show a flow chart of a Embodiment of the method according to the invention.
  • an internal combustion engine is referred to an intake line 105 receives fresh air and emits 110 exhaust gases via an exhaust pipe.
  • the internal combustion engine shown is a four-cylinder internal combustion engine. Every cylinder the Internal combustion engine is an injector 120, 121, 122 and 123 assigned. The injectors are connected via solenoid valves 130, 131, 132 and 133 fuel metered. The fuel arrives from a so-called rail 135 via the injectors 120, 121, 122 and 123 into the cylinders of internal combustion engine 100.
  • the fuel in the rail 135 is from a high pressure pump 145 brought to an adjustable pressure.
  • the High pressure pump 145 is connected to a via a solenoid valve 150
  • Fuel delivery pump 155 connected.
  • the fuel delivery pump communicates with a fuel tank 160.
  • the valve 150 comprises a coil 152.
  • the solenoid valves 130, 131, 132 and 133 include coils 140, 141, 142 and 143 that each supplied with current by means of an output stage 175 can be.
  • the final stage 175 is preferably in one Control device 170 arranged, which also the coil 152nd controls.
  • a sensor 177 is provided which detects the pressure in the Rail 135 detected and a corresponding signal to the Control unit 170 conducts.
  • the Control unit 180 can be designed as an independent control unit his. However, it can also be integrated into the controller 170 his.
  • the pressure control valve can from the Control 170 can be controlled and are present a corresponding control signal the connection between the rail 135 and the return line 195 and thus the Reservoir 160 free.
  • the Sensors 181 to 184 designed as pressure sensors. This Sensors record the combustion chamber pressure in the combustion chambers of the single cylinder.
  • the Fuel delivery pump 155 delivers the fuel from the Storage container via valve 150 to high pressure pump 145.
  • the high pressure pump 145 builds one in the rail 135 predefinable pressure on. Usually pressure values achieved greater than 800 bar in Rail 135.
  • the Control signals for the coils set the Start of injection and end of injection of fuel the injectors 120 to 123.
  • the control signals are depending on the control unit from different Operating conditions, such as the driver's request, the speed and other sizes.
  • the temperature in the Combustion chamber of each engine cylinder measured. Exceeds that Temperature of one of the cylinders a predetermined Threshold, the fuel supply is reduced or turned off or other emergency driving measures initiated.
  • the senor is in the Glow plug integrated. This has the advantage that none additional drilling in the engine is required. Especially It is advantageous if the electrical resistance of the Glow plugs are used as temperature signals. This Resistance changes by a factor of 2 to 4 in Temperature range O to 1100 ° C. Alternatively, the Thermal effect of the glow plugs to provide a Temperature signal can be evaluated.
  • the target temperature in the combustion chamber is used for fault detection depending on the target fuel quantity and engine speed N saved. This target temperature is compared with the Combustion chamber measured temperature compared. If the actual temperature in the combustion chamber longer than a time ts by more than a temperature difference ⁇ exceeds the error recognized and the amount of fuel greatly reduced or switched off.
  • step 200 a counter t set to zero. Then in step 210 the current combustion chamber temperature TI, the fuel quantity QKS and Speed N detected.
  • the fuel quantity QKS can all be in fuel quantity signals present to controller 170, such as for example the target or the actual fuel quantity be used.
  • step 220 the setpoint temperature becomes the map IS as a function F of the fuel quantity QKS and the speed N read out.
  • the query 230 checks whether the amount of the difference between the actual temperature TI and the target temperature Ts is less than ⁇ . If this is the case, follow again Step 210. If not, i. H. the actual temperature deviates significantly from the target temperature, so the time counter t is increased by 1 in step 240. The Query 250 checks whether the time counter t is greater or is equal to a threshold ts. If this is not the case, then Step 210 follows again. If this is the case, then in Step 260 is detected for errors and there will be corresponding ones Measures initiated.
  • step 300 the temperature signal of the first Cylinder Z1 detected. Accordingly, in step 300 Temperature signal of the second cylinder Z2 detected. In step 302 and 303 becomes the temperature signal of cylinders Z3 and Z4 detected. In step 310, the amplitudes of the four Signals summed up and divided by 4. Hence it follows the mean M of the four temperature signals.
  • step 320 a counter i is set to 0 and in subsequent step 330 increased by 1.
  • Query 340 checks whether the difference between the values Zi of the i-th Cylinder and the average M greater than a threshold value S is. If this is not the case, query 350 checks whether i is greater than or equal to 4. If this is not the case, then step 330 occurs again or if i is greater than or equal to 4 step 300 follows.
  • Step 360 recognizes that the amount of the difference between the values of the i-th cylinder Zi and the Mean value M is greater than the threshold value S, then in Step 360 detected errors and a corresponding one Measures initiated.
  • a time counter t becomes zero set.
  • one of the Temperature sensors 181 to 184 have a temperature value Z (k) Combustion chamber temperature.
  • the time counter is in Step 420 increased by one.
  • the subsequent query 430 checks whether a waiting time tw has expired. Is this If this is not the case, step 420 follows again.
  • Step 450 forms then the difference ZA between the old value Z (k) and the new value Z (k + 1). This difference ZA is a measure for the temperature rise during the waiting period tw.
  • the subsequent query 460 checks whether the Difference ZA is greater than a threshold value SA. Is this the old value Z (k) does not become the case in step 470 overwritten with the new value Z (k + 1). Then follows Step 420. Query 460 recognizes that the Temperature rise is greater than an allowable value, so step 480 detects errors.
  • the device both a detects increased as well as a reduced injection quantity.
  • the pressure in the rail to a value just above the Opening pressure of the nozzles can be set. At this Measure can still damage a sensitive engine take too much fuel from a leaky nozzle can flow.
  • Safe emergency driving can be achieved if the Engine cylinders are assigned to two groups and for each Group a separate high pressure pump, a separate rail and a separate pressure relief valve is used. At this configuration can only the cylinder group be switched off in which a combustion chamber with too high Temperature was diagnosed. With the second Cylinder group can maintain emergency operation become.
  • a particularly advantageous alternative is when Place or in addition to the temperature sensors 181 to 184 at least one pressure sensor is used, the a signal delivers that corresponds to the pressure in the respective combustion chamber.
  • the error detection takes place using average values across all cylinders, as in the case of Temperature measurement. Instead of the temperature signals Pressure signals processed.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Control Of Steam Boilers And Waste-Gas Boilers (AREA)

Abstract

L'invention concerne un procédé et un dispositif permettant de surveiller un système de dosage de carburant, notamment un système d'injection par accumulation de pression pour moteur Diesel à combustion interne. Un fonctionnement défectueux du système de dosage est identifié lorsqu'un signal émis par un capteur de température et/ou un détecteur de pression, dévie d'une valeur prédéfinissable.

Claims (8)

  1. Procédé de surveillance d'un système de dosage de carburant d'un moteur Diesel notamment à rampe commune,
    caractérisé en ce qu'
    on détecte un système de dosage défectueux si un signal d'un capteur saisissant la température et/ou la pression dans au moins une chambre de combustion du moteur, diffère d'une valeur moyenne correspondant à tous les cylindres, ou
    si un signal d'un capteur qui saisit la température dans au moins une chambre de combustion du moteur, augmente de plus d'une variation autorisée à l'intérieur d'une période prédéterminée.
  2. Procédé selon la revendication 1,
    caractérisé en ce que
    le capteur fournit un signal qui correspond à la température dans la chambre de combustion.
  3. Procédé selon la revendication 1,
    caractérisé en ce que
    le capteur fournit un signal qui correspond à la pression dans la chambre de combustion.
  4. Procédé selon l'une des revendications précédentes,
    caractérisé en ce que
    le capteur de température est intégré dans une bougie de préchauffage.
  5. Procédé selon l'une des revendications précédentes,
    caractérisé en ce que
    la résistance de la bougie de préchauffage est exploitée comme constituant une mesure de la température.
  6. Procédé selon l'une des revendications précédentes,
    caractérisé en ce que
    lorsqu'un défaut est reconnu, on diminue la pression dans la rampe.
  7. Procédé selon l'une des revendications précédentes,
    caractérisé en ce qu'
    on répartit les cylindres en deux groupes et, lorsqu'un défaut est reconnu dans un groupe, on coupe ce groupe reconnu comme défectueux.
  8. Dispositif de surveillance d'un système de dosage de carburant d'un moteur Diesel notamment d'un système à rampe commune,
    caractérisé par
    des moyens reconnaissant un système de dosage défectueux lorsqu'un signal d'un capteur saisissant la température et/ou la pression dans au moins une chambre de combustion du moteur, diffère d'une valeur moyenne concernant tous les cylindres, ou
    des moyens qui reconnaissent un système de dosage défectueux si un signal d'un capteur qui saisit la température dans au moins une chambre de combustion du moteur, augmente de plus d'une variation autorisée à l'intérieur d'une période prédéterminée.
EP96913445A 1995-09-28 1996-04-24 Procede et dispositif permettant de surveiller un systeme de dosage de carburant Expired - Lifetime EP0795077B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19536109A DE19536109A1 (de) 1995-09-28 1995-09-28 Verfahren und Vorrichtung zur Überwachung eines Kraftstoffzumeßsystems
DE19536109 1995-09-28
PCT/DE1996/000749 WO1997012137A1 (fr) 1995-09-28 1996-04-24 Procede et dispositif permettant de surveiller un systeme de dosage de carburant

Publications (2)

Publication Number Publication Date
EP0795077A1 EP0795077A1 (fr) 1997-09-17
EP0795077B1 true EP0795077B1 (fr) 2001-10-04

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EP96913445A Expired - Lifetime EP0795077B1 (fr) 1995-09-28 1996-04-24 Procede et dispositif permettant de surveiller un systeme de dosage de carburant

Country Status (6)

Country Link
US (1) US5816220A (fr)
EP (1) EP0795077B1 (fr)
JP (1) JPH10512345A (fr)
KR (1) KR980700509A (fr)
DE (2) DE19536109A1 (fr)
WO (1) WO1997012137A1 (fr)

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Publication number Publication date
WO1997012137A1 (fr) 1997-04-03
DE19536109A1 (de) 1997-04-03
EP0795077A1 (fr) 1997-09-17
DE59607829D1 (de) 2001-11-08
KR980700509A (ko) 1998-03-30
JPH10512345A (ja) 1998-11-24
US5816220A (en) 1998-10-06

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