EP0579967B1 - Verfahren und Vorrichtung zur Ermittlung der einer Brennkraftmaschine zugeführten Kraftstoffmenge - Google Patents

Verfahren und Vorrichtung zur Ermittlung der einer Brennkraftmaschine zugeführten Kraftstoffmenge Download PDF

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Publication number
EP0579967B1
EP0579967B1 EP93109928A EP93109928A EP0579967B1 EP 0579967 B1 EP0579967 B1 EP 0579967B1 EP 93109928 A EP93109928 A EP 93109928A EP 93109928 A EP93109928 A EP 93109928A EP 0579967 B1 EP0579967 B1 EP 0579967B1
Authority
EP
European Patent Office
Prior art keywords
signal
fuel quantity
signals
fuel
coming
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
EP93109928A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0579967A2 (de
EP0579967A3 (enrdf_load_stackoverflow
Inventor
Gerhard Stumpp
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 EP0579967A2 publication Critical patent/EP0579967A2/de
Publication of EP0579967A3 publication Critical patent/EP0579967A3/xx
Application granted granted Critical
Publication of EP0579967B1 publication Critical patent/EP0579967B1/de
Anticipated expiration legal-status Critical
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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
    • F02D41/24—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
    • F02D41/28—Interface circuits
    • 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
    • F02D35/0007—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for using electrical feedback
    • 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
    • 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
    • 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
    • F02D2200/0614—Actual fuel mass or fuel injection amount

Definitions

  • the invention relates to a method and a device for determining the amount of fuel supplied to an internal combustion engine according to the preambles of the independent claims.
  • an electronic control device for an internal combustion engine with auto-ignition which comprises an injection nozzle and a nozzle needle moving therein.
  • An encoder scans the position or the movement of the nozzle needle in the injection nozzle and generates a corresponding scanning signal.
  • an evaluation circuit determines an injection duration signal which indicates the duration of the fuel injection into the internal combustion engine and with which the amount of fuel can be determined. This amount of fuel is used as a load signal for an operating parameter-dependent specification of the start of injection and / or the exhaust gas recirculation rate.
  • this signal does not exactly reflect the amount of fuel actually injected. This inaccuracy of the fuel quantity in turn causes an increased exhaust gas emission due to the imprecise exhaust gas recirculation or the start of injection.
  • a device which comprises a piezo pressure transmitter which measures the duration of the injection.
  • the measured values are superimposed by two piezo pressure transmitters.
  • a further device for detecting the amount of fuel supplied to the combustion chambers of a diesel engine comprises a pressure sensor which detects the pressure in the pump element and a circuit arrangement which determines the fuel quantity on the basis of the signal from the pressure sensor.
  • this device Due to changes or variations in the nozzle opening pressure or the closing pressure of the injection valve, this device also provides insufficient fuel quantity accuracy. In particular, drift phenomena occur in such fuel metering systems, due to which the association between the detected signal and the amount of fuel actually injected changes during the operation of the internal combustion engine.
  • the solenoid valve closing time is used as the fuel quantity.
  • the invention has for its object to provide a method and device for determining the amount of fuel supplied to an internal combustion engine of the type mentioned, with which a drift-free, very precise amount of fuel can be determined.
  • a drift-free fuel quantity can be provided by means of the device according to the invention and the method according to the invention.
  • An internal combustion engine 100 receives fuel from a fuel pump 110 via a fuel line.
  • An actuator 120 determines the fuel quantity supplied to the internal combustion engine 100 as a function of a control signal T i .
  • a control device 130 provides the control signal T i .
  • the control device 130 processes signals from various sensors 150. These sensors 150 provide at least one speed and one fuel temperature signal. Furthermore, the control device 130 is supplied with the output signals from sensors 160, 164 and 168.
  • the output signals of these sensors arrive at averaging 134 and from there to a quantity calculation 136.
  • This quantity calculation 136 further processes the output signals of the sensors 150.
  • the control circuit 132 calculates the control signals T i on the basis of the sensor signals.
  • the output signal of the quantity calculation 136 is available for further control devices 140.
  • These further control devices 140 influence e.g. the exhaust gas recirculation rate, the start of spraying or the maximum permissible amount of fuel to be injected.
  • the sensors 160, 164 and 168 provide signals from which the injected fuel quantity can be calculated.
  • the sensor 160 is a transmitter which supplies a signal RW with respect to the position of the control slide or control rod.
  • This signal is usually referred to as a slide path or control path RW.
  • This signal is used to regulate the control rod or the control slide to a predetermined position by means of a control regulator. Based on this signal, which corresponds to the position of the control rod or control slide, a first signal QRW indicating the fuel quantity is obtained.
  • a sensor 164 can be provided which detects the pressure in the element space of the pump.
  • the time period in which the pressure in the element space is greater than a threshold value is usually referred to as the element space pressure duration ED.
  • the element space pressure duration ED is also a measure of the amount of fuel actually injected.
  • a second signal QED indicating the fuel quantity results. Sensors and the corresponding signal processing for determining the element space pressure duration ED and the second signal QED are described, for example, in DE-OS 31 18 425 (US Pat. No. 4,426,981).
  • Sensor 168 is a sensor for detecting the actual start and end of injection. This sensor detects the opening time of an injection valve. The opening time is usually also referred to as the spraying time SD.
  • a third signal QSD which indicates the fuel quantity, results from the spray duration SD and any further operating parameters and constants. Sensors and the corresponding signal processing for determining the spray duration SD and the third signal QSD are e.g. in DE-OS 30 32 381 (US-A 4 762 107).
  • the sensors described are usually available for in-line and distributor pumps.
  • the control rod or control slide is omitted and a solenoid valve takes its place.
  • the start and end of injection can be controlled using this solenoid valve.
  • These solenoid valves are usually arranged in such a way that when the solenoid valve closes, the start of injection and when the solenoid valve opens, the end of injection is determined.
  • the solenoid valve closing time MD results from the exact point in time at which the solenoid valve opens and closes.
  • This signal relating to the solenoid valve closing duration MD replaces the signal RW.
  • a fourth signal QMD indicating the fuel quantity results.
  • the signals indicating the quantity of fuel provided by these sensors are of limited accuracy. If the amount of fuel obtained in this way is used to control further variables, there are considerable errors in such a control.
  • the exhaust gas recirculation rate is usually set as a function of the amount of fuel injected. If the amount of fuel is inaccurate, there is also an inaccurate exhaust gas recirculation, which in turn causes increased exhaust gas emissions.
  • the fuel quantity QK is also required for setting the start of injection and for determining the maximum permissible fuel quantity. It is therefore necessary that this signal be determined with the greatest possible accuracy.
  • the different signals indicating the fuel quantity have a different drift behavior.
  • a change in the nozzle opening pressure affects the different fuel quantities of the different sensors differently.
  • the fuel quantity QK increases with falling nozzle opening (closing) pressure.
  • the quantity of fuel QK falls as the nozzle opening (closing) pressure falls.
  • the mean value of at least two signals is therefore processed instead of a signal.
  • the mean value formation forms the mean value from at least two signals which are provided by the sensors 160, 164 and 168.
  • the mean value is preferably formed from the third signal QSD, which results from the spray duration SD, and one of the other signals.
  • weighted averaging takes place.
  • an average value is calculated from three or more signals.
  • the errors in the individual signals are compensated for by averaging at least two signals indicating the fuel quantity and having different drift behavior.
  • the averaged signal is more precise than the individual signals, and the gain in accuracy is greater than is usually obtained by averaging.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
EP93109928A 1992-07-21 1993-06-22 Verfahren und Vorrichtung zur Ermittlung der einer Brennkraftmaschine zugeführten Kraftstoffmenge Expired - Lifetime EP0579967B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4223955 1992-07-21
DE4223955A DE4223955A1 (de) 1992-07-21 1992-07-21 Verfahren und Vorrichtung zur Ermittlung der einer Brennkraftmaschine zugeführten Kraftstoffmenge

Publications (3)

Publication Number Publication Date
EP0579967A2 EP0579967A2 (de) 1994-01-26
EP0579967A3 EP0579967A3 (enrdf_load_stackoverflow) 1994-03-30
EP0579967B1 true EP0579967B1 (de) 1996-10-23

Family

ID=6463708

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93109928A Expired - Lifetime EP0579967B1 (de) 1992-07-21 1993-06-22 Verfahren und Vorrichtung zur Ermittlung der einer Brennkraftmaschine zugeführten Kraftstoffmenge

Country Status (3)

Country Link
EP (1) EP0579967B1 (enrdf_load_stackoverflow)
JP (1) JPH06167239A (enrdf_load_stackoverflow)
DE (2) DE4223955A1 (enrdf_load_stackoverflow)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10038230C2 (de) * 2000-08-04 2003-04-30 Siemens Ag Verfahren zur Bestimmung einer Brennstoffmasse
DE102004060841A1 (de) * 2004-12-17 2006-06-29 Deutz Ag Abgasrückführsteuerung mittels Lastsignal an einer Reiheneinspritzpumpe
EP3304312B1 (en) * 2015-06-06 2020-02-12 The Board of Trustees of the Leland Stanford Junior University Post-silicon validation and debug using symbolic quick error detection
US10058879B2 (en) * 2015-10-29 2018-08-28 Capstan Ag Systems, Inc. System and methods for estimating fluid flow based on valve closure time

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2098334A (en) * 1981-05-09 1982-11-17 Bosch Gmbh Robert Determining injected fuel quantities in a diesel engine
US4426980A (en) * 1980-03-26 1984-01-24 Robert Bosch Gmbh Correction device for a fuel metering system in an internal combustion engine

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5654959A (en) * 1979-10-09 1981-05-15 Mitsuwa Seiki Co Ltd Control method of fuel injection timing adjustment device
DE3032381C2 (de) * 1980-08-28 1986-07-24 Robert Bosch Gmbh, 7000 Stuttgart Elektronische Steuereinrichtung für eine Brennkraftmaschine mit Selbstzündung
EP0168488A1 (en) * 1984-01-16 1986-01-22 Stanadyne Inc. Piezoelectric sensor
JPH0694837B2 (ja) * 1986-12-27 1994-11-24 いすゞ自動車株式会社 燃料噴射装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
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
GB2098334A (en) * 1981-05-09 1982-11-17 Bosch Gmbh Robert Determining injected fuel quantities in a diesel engine

Also Published As

Publication number Publication date
DE59304255D1 (de) 1996-11-28
EP0579967A2 (de) 1994-01-26
JPH06167239A (ja) 1994-06-14
EP0579967A3 (enrdf_load_stackoverflow) 1994-03-30
DE4223955A1 (de) 1994-01-27

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