EP0828069A2 - Méthode et dispositif pour surveiller le limiteur de débit de l'alimentation en carburant d'un moteur à combustion - Google Patents

Méthode et dispositif pour surveiller le limiteur de débit de l'alimentation en carburant d'un moteur à combustion Download PDF

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Publication number
EP0828069A2
EP0828069A2 EP97109450A EP97109450A EP0828069A2 EP 0828069 A2 EP0828069 A2 EP 0828069A2 EP 97109450 A EP97109450 A EP 97109450A EP 97109450 A EP97109450 A EP 97109450A EP 0828069 A2 EP0828069 A2 EP 0828069A2
Authority
EP
European Patent Office
Prior art keywords
fuel
flow
internal combustion
combustion engine
injector
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Withdrawn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
EP97109450A
Other languages
German (de)
English (en)
Other versions
EP0828069A3 (fr
Inventor
Jürgen Biester
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 EP0828069A2 publication Critical patent/EP0828069A2/fr
Publication of EP0828069A3 publication Critical patent/EP0828069A3/fr
Withdrawn legal-status Critical Current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
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
    • 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
    • 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
    • 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

Definitions

  • the invention relates to a method and a device to monitor a flow restrictor Fuel metering system of an internal combustion engine.
  • the flow limiter can function be disturbed. If corresponding faults are not recognized, this leads to an impermissibly high amount of injected fuel. This in turn causes one Overloading the engine and can up to Destroy them.
  • the invention is based, the Flow limiter of a fuel metering system if possible easy to monitor for functionality.
  • FIG. 1 shows 2 shows a block diagram of the device according to the invention
  • FIG. 2 a flow chart for explaining the invention Procedure
  • Figure 3 different signals over time t applied
  • Figure 4 is a flow diagram of another Embodiment of the procedure according to the invention.
  • the device according to the invention is based on the example a self-igniting internal combustion engine, where the fuel metering by means of a solenoid valve is controlled.
  • the embodiment shown in Figure 1 relates to a so-called common rail system.
  • the invention Approach is not on these systems limited.
  • 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 injector and the Flow limiter a structural unit.
  • the Flow limiter can alternatively between each Solenoid valve and the rail or between the solenoid valve and the respective injector.
  • the flow restrictors are designed such that they Connection between the Rail 135 and the injectors interrupt if through this line within a certain time unit more than a predetermined Amount of fuel flows. This amount is chosen so that it is larger than the largest when operating correctly occurring quantity. It is therefore larger than the full load quantity or the starting quantity. The amount is also chosen so that it is less than the amount at which the Internal combustion engine is damaged.
  • 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 155 is in with a fuel reservoir 160 in Connection.
  • the valve 150 comprises a coil 152.
  • the solenoid valves 130, 131, 132 and 133 include coils 140, 141, 142 and 143 that be supplied with current by means of an output stage 175 can.
  • the output stage 175 is preferably in a control unit 170 arranged, which corresponds to the coil 152 controls.
  • a sensor 177 is provided which detects the pressure in the Rail 135 detects and a corresponding signal to the control unit 170 directs.
  • An error detection 176 evaluates various signals and In the event of a fault, power is applied to the 175 output stage and the valve 152 with a corresponding signal.
  • Control unit 170 is connected to one via two switching means Ubat supply voltage in connection.
  • the first Switching means 190 connects the supply voltage Ubat via a so-called terminal 15 (KL15) with the control device 170.
  • a second switching means 192 connects the Ubat supply voltage via a so-called terminal 30 (KL30) with control unit 170.
  • the switching means 190 is the Ignition switch by the driver when starting the Internal combustion engine is operated. When operating the This switch is in his internal combustion engine closed position.
  • connection point between the switching means 190 and the Control device 170 which is also referred to as terminal 15, is also available via the winding of a relay 194 Mass in connection.
  • the switching means When the internal combustion engine is operating, the switching means is 190 closed, relay 194 energized and switch 192 also closed. When switching off the internal combustion engine opens the switching means 190. This stops the current flow prevented by relay 194.
  • the relay 194 is like this designed that it still for a while Hold switch 192 in its closed state. Thereby control unit 170 will continue to operate for a certain time Power supplied. This time is usually called Designated caster. Usually run during this time various test programs.
  • Such a device is for example from the DE-OS 38 02 770 (US-A 4 905 645) is known.
  • the fuel delivery pump 155 delivers the fuel from the reservoir via valve 150 to high pressure pump 145.
  • the high pressure pump 145 builds a predefinable pressure in the rail 135 on.
  • Pressure values of about 10 to 2000 bar achieved.
  • the corresponding Solenoid valves 130 to 133 controlled.
  • the flow limiter preferably interrupts the Fuel flow if that in a given unit of time injected fuel amount a threshold exceeds.
  • error monitoring 175 If error monitoring 175 detects an error, it switches the error monitor 175 to an emergency driving program. This means that valve 150 is in its closed state brought. This ensures that no other Fuel is provided by the pump 115.
  • the Solenoid valves 140, 141, 142 and 143 controlled such that the fuel metering in an angular position Release the crankshaft in which the injection does not Contributes to the torque of the internal combustion engine. It is particularly advantageous if the fuel metering is released in the area of bottom dead center. This means the fuel metering takes place immediately before Open the exhaust valves of the internal combustion engine. Here the injectors are controlled so that such Amount of fuel is metered that the flow restrictor disconnect.
  • Step 200 the position of the switching means 190 as signal SN read. Then in step 205 this signal SN compared with the previous switch position SA. are the two switching positions are the same, so in step 210 the old switch position with the new switch position overwritten. We will connect after a waiting period the new position SN of the switching means 190 in step 200 read.
  • Query 205 recognizes that the position of the Switching means 190 has changed, this means that Switching means 190 has been opened, so a test program processed to check the flow limiter.
  • the injectors become like this controlled to meter such a quantity of fuel, that the flow limiters respond. Preferably only increases the amount for a metering, then it will be reduced to the usual value.
  • step 225 the speed N becomes the Internal combustion engine detected.
  • step 230 a Time counter t increased.
  • the query 235 checks whether the value of the time counter is greater than a time threshold tW. Is if this is not the case, step 225 and Step 230 processed.
  • Query 235 recognizes that the time counter t is greater than that Is the threshold value tW, the query 240 follows. The query 240 checks whether the speed N is less than a Speed threshold is NS. If this is the case, it ends Program in step 245. Query 240 recognizes that the Speed is greater than the threshold value NS, then in Step 250 recognized for errors and a corresponding one Fault memory set or the fault is the driver displayed.
  • a Query 260 may be provided.
  • Query 260 checks whether the speed N has dropped since the control. For this a speed value NA was stored in step 220. The Query 260 checks whether the current speed value N is less than the old speed value NA. Is that the case, the program ends in step 265. Recognizes the query 240 that the current speed N is greater than the old one Speed value is NA, then in step 250 there is an error recognized and a corresponding error memory set or the error is displayed to the driver.
  • Queries 240 and 260 recognize whether the flow restrictors have addressed, and turned off the internal combustion engine has come to a standstill.
  • the flow limiter after switching off the Internal combustion engine by the driver's operability the flow limiter checked.
  • the injector controlled individually and / or jointly such that the Injector releases a flow of fuel that causes the flow limiter interrupts the fuel flow and the internal combustion engine comes to a standstill.
  • the Functionality of the flow limiter is recognized when the speed after a waiting time tW after the Control of the injectors drops and / or below a threshold.
  • Step 400 a counter L is set to 1. Then in Step 410 is for the drive signal AL of the Lth Cylinder corresponding to step 220 such a value AMAX chosen that the corresponding flow limiter responds.
  • the subsequent step 415 detects the Speed N.
  • the setpoint NS for the Speed is predefined at least depending on the time t. Here, the expected course of the speed at Switching off is taken into account.
  • the subsequent query 430 checks whether the in Step 415 measured speed N from the expected speed NS deviates. In particular, it is checked whether the measured Speed N is greater than the expected value NS. Is this the Case, ie the speed deviates from its expected Value, the device detects in step 440 Flow restrictor error.
  • step 450 follows Counter L increased by one.
  • the subsequent query 460 checks that all flow restrictors have been checked that means whether the injection quantity has increased for all cylinders has been. If the query recognizes that the counter L assumes a value that is greater than the number of cylinders ZZ, the program ends in step 470. Otherwise it is done the jump to step 410 and the check of the follows next cylinder.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
EP97109450A 1996-08-10 1997-06-11 Méthode et dispositif pour surveiller le limiteur de débit de l'alimentation en carburant d'un moteur à combustion Withdrawn EP0828069A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19632339 1996-08-10
DE1996132339 DE19632339A1 (de) 1996-08-10 1996-08-10 Verfahren und Vorrichtung zur Überwachung eines Durchflußbegrenzers eines Kraftstoffzumeßsystems einer Brennkraftmaschine

Publications (2)

Publication Number Publication Date
EP0828069A2 true EP0828069A2 (fr) 1998-03-11
EP0828069A3 EP0828069A3 (fr) 2000-02-23

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP97109450A Withdrawn EP0828069A3 (fr) 1996-08-10 1997-06-11 Méthode et dispositif pour surveiller le limiteur de débit de l'alimentation en carburant d'un moteur à combustion

Country Status (4)

Country Link
EP (1) EP0828069A3 (fr)
JP (1) JPH1077890A (fr)
CN (1) CN1085295C (fr)
DE (1) DE19632339A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1215386A3 (fr) * 2000-12-15 2004-01-21 Toyota Jidosha Kabushiki Kaisha Dispositif et procédé de diagnostic d'un système d'alimentation de carburant

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19850221C1 (de) * 1998-10-31 2000-05-04 Mtu Friedrichshafen Gmbh Verfahren zum Prüfen einer Drosselstelle, insbesondere einer Drosselstelle eines Injektors
US7428893B2 (en) * 2004-11-12 2008-09-30 Caterpillar Inc Electronic flow control valve
CN104471226A (zh) * 2012-07-12 2015-03-25 瓦锡兰瑞士有限公司 用于有缺陷的喷咀的控制方法
DE102014205529A1 (de) 2014-03-25 2015-10-01 Robert Bosch Gmbh Verfahren zur Überwachung eines Durchflussbegrenzers

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3802770A1 (de) * 1988-01-30 1989-08-10 Bosch Gmbh Robert Sicherheitssystem fuer brennkraftmaschinen
DE3844287A1 (de) * 1988-12-30 1990-07-05 Bosch Gmbh Robert Verfahren und vorrichtung zur ueberpruefung eines sicherheitsabstellers bei brennkraftmaschinen, insbesondere dieselmotoren

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1215386A3 (fr) * 2000-12-15 2004-01-21 Toyota Jidosha Kabushiki Kaisha Dispositif et procédé de diagnostic d'un système d'alimentation de carburant

Also Published As

Publication number Publication date
JPH1077890A (ja) 1998-03-24
CN1085295C (zh) 2002-05-22
EP0828069A3 (fr) 2000-02-23
CN1173585A (zh) 1998-02-18
DE19632339A1 (de) 1998-02-12

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