WO2009089937A2 - Unité, système et procédé de calcul de courant - Google Patents

Unité, système et procédé de calcul de courant Download PDF

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Publication number
WO2009089937A2
WO2009089937A2 PCT/EP2008/065272 EP2008065272W WO2009089937A2 WO 2009089937 A2 WO2009089937 A2 WO 2009089937A2 EP 2008065272 W EP2008065272 W EP 2008065272W WO 2009089937 A2 WO2009089937 A2 WO 2009089937A2
Authority
WO
WIPO (PCT)
Prior art keywords
coil
temperature
fuel
current calculation
current
Prior art date
Application number
PCT/EP2008/065272
Other languages
German (de)
English (en)
Other versions
WO2009089937A3 (fr
Inventor
Michael Raff
Guenter Veit
Stefan Keller
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 WO2009089937A2 publication Critical patent/WO2009089937A2/fr
Publication of WO2009089937A3 publication Critical patent/WO2009089937A3/fr

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/56—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects
    • 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
    • F02D41/3845—Controlling the fuel pressure by controlling the flow into the common rail, e.g. the amount of fuel pumped
    • 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
    • F02M63/023—Means for varying pressure in common rails
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F22/00—Methods or apparatus for measuring volume of fluids or fluent solid material, not otherwise provided for
    • 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
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • F02D2041/202—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit
    • F02D2041/2065—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit the control being related to the coil temperature
    • 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
    • F02D2200/0606—Fuel temperature

Definitions

  • the present invention relates to a current calculation unit, a current calculation system and a current calculation method for calculating a current through a common rail pump metering unit of an injection system for injecting fuel in a motor vehicle.
  • a common high-pressure fuel line in particular in diesel injection systems, a common high-pressure fuel line, the so-called “common rail” (hereinafter also referred to as “rail”), with corresponding outlets to the individual cylinders is used to supply the cylinders with fuel.
  • the pressure in the rail is kept constant via a control loop.
  • the pressure is detected by a pressure sensor and regulated to a predetermined value. This predetermined value is calculated with the help of comparators and maps.
  • a current setpoint with which the metering unit of a fuel delivery pump is driven.
  • This metering unit has a solenoid valve which, in the opened state, allows fuel to flow from a fuel reservoir to the rail and, in the closed state, separates the connection between the fuel reservoir and the rail. Resistance and inductance of the solenoid valve are dependent on the temperature, so that a current control must be provided, which regulates the current through the solenoid valve to a predetermined value.
  • FIG. 1 shows a schematic block diagram of a conventional current control circuit 10 for the current I through the solenoid valve (shown here as impedance 21) of the measuring unit of a common rail pump 20.
  • the current control circuit 10 in Fig. 1 comprises a shunt resistor 11 and a MOSFET transistor 12 which is connected in series with the solenoid valve 21 of the metering unit are.
  • the transistor 12 is connected to the source and drain between the shunt resistor 11 and ground potential V gnd.
  • An analog operational amplifier 13 compares the potentials at both ends of the shunt resistor 11 with each other and outputs a comparison signal to an analog / digital converter 14 of a control unit 15. Between the drain of the transistor 12 and the supply potential V bat also a freewheeling diode 16 is provided.
  • the control unit 15 compares the digitized comparison signal with a reference signal and thus determines whether the current flowing through the solenoid valve 21 current I corresponds to a predetermined value. When the controller 15 detects that the current I flowing through the solenoid valve 21 does not correspond to the predetermined value, the controller 15 controls the current to the predetermined value. For this purpose, an output of the control unit 15 is connected to the gate of the transistor 12. The control unit 15 activates the gate by means of pulse width modulation (PWM) by means of a PWM signal PWM, wherein the control unit 15 controls the duty cycle of the PWM signal.
  • PWM pulse width modulation
  • Signal PWM adapts to correct any deviations between the setpoint and the actual value of the current I through the solenoid valve 21.
  • Disadvantages of the conventional method according to FIG. 1 are the costs for providing the shunt resistor 11 and the operational amplifier 13 for the detection of the current through the metering unit.
  • the current calculation unit according to the invention with the features of claim 1 the current calculation system according to the invention with the features of claim 7 and the method according to the invention with the features of claim 10 each have the advantage that the shunt resistor and the operational amplifier for the detection of the current through the coil Metering unit can be omitted without replacement. Thus, according to the present invention, costs are saved.
  • the idea underlying the present invention is to detect the current through the coil not by a measurement, but rather, in particular, by an offset between the fuel temperature inherently provided in the system by the fuel sensor and by a fuel pressure to calculate a predetermined offset between the fuel temperature and the coil temperature. It is sufficient to determine this offset or offset value in advance by means of a validation process, so that the invention Current calculation unit can be installed in the field in a variety of vehicles, which can then calculate the current through the metering unit in particular depending on the currently measured fuel temperature and the predetermined offset value.
  • a current calculation unit for calculating a current through a metering unit for a common rail pump of an injection system for injecting fuel with a calculation means, which is adapted to a coil temperature-dependent actual resistance of a coil of the metering unit in dependence on a temperature To calculate coefficients of a coil wire of the coil, a predetermined reference resistance of the coil at a reference temperature, a measured fuel temperature of the fuel and a certain offset value between the fuel temperature and the coil temperature.
  • a current calculating system for calculating a current through a common rail pump metering unit of a fuel injection injection system, comprising: a current calculating unit as explained above; and a further calculation unit, which is adapted to the current through the metering unit in
  • a method for calculating a current through a metering unit for a common rail pump of an injection system for injecting fuel comprising the following steps: - providing a temperature coefficient of a coil wire of a coil of the metering unit;
  • the offset value is determined by means of a validation process at least as a function of the coil temperature and the fuel temperature for at least one motor vehicle.
  • the calculation unit has at least one first interface unit which is set up to receive the measured fuel temperature from a fuel temperature sensor arranged in an inlet of the injection system.
  • the calculation unit has at least one second interface device, which is set up to receive the temperature coefficient and / or the predetermined reference resistance and / or the determined offset value.
  • the current calculation unit and / or the calculation unit are / is designed as a computer program product.
  • this has a memory device which is set up to store the temperature coefficient of the coil wire and / or the predetermined reference resistance of the coil and / or the determined offset value.
  • this can be coupled to a communication bus which is suitable for transmitting the fuel temperature measured by the fuel temperature sensor to the current calculation unit.
  • a computer program product which causes the execution of a method according to claim 10 on a program-controlled device.
  • Fig. 1 is a schematic block diagram of a conventional current control circuit
  • Fig. 2 is a schematic block diagram of an embodiment of the invention
  • Fig. 3 is a schematic block diagram of an embodiment of the invention
  • FIG. 4 shows a schematic flow diagram of an exemplary embodiment of the method according to the invention for calculating the current through the metering unit.
  • FIG. 2 shows a schematic block diagram of an embodiment of the current calculation unit 30 according to the invention for calculating a current I through a metering unit for a common rail pump 20 of an injection system for injecting fuel.
  • the current calculation unit 30 has a first calculation means 31.
  • the first calculating means 31 is adapted to a coil temperature-dependent actual resistance R (Ts) of a coil 21 of the metering unit depending on a material-specific temperature coefficient ⁇ of a coil wire of the coil 21, a predetermined reference resistance R (Tref), the coil 21 at a reference temperature (Tref), a measured fuel temperature (Tk) of the fuel, in particular in an inlet of the injection system, and a specific offset value OS between the fuel temperature Tk and the coil temperature Ts to calculate.
  • the offset value OS is determined in particular by means of a validation process at least as a function of the coil temperature Ts and the fuel temperature Tk in at least one motor vehicle.
  • the validation process is carried out in advance of the standard installation of the current calculation unit. Is this validation process done and thus determines the offset value OS, the current calculation unit 30 can be installed in series, and this current calculation unit 30 can then calculate the current I through the metering unit, in particular as a function of the determined offset value OS.
  • the calculation unit 31 has, in particular, a first interface unit 32 and a second interface unit 33.
  • the first interface unit 32 is in particular configured to receive the measured fuel temperature Tk from a fuel temperature sensor arranged in an inlet of the injection system.
  • the second interface unit 33 is configured to receive the temperature coefficient ⁇ , the predetermined reference resistance R (Tref) and the determined offset value OS.
  • each of the current calculation unit 30 and the calculation unit 31 is designed as a computer program product.
  • FIG. 3 shows a schematic block diagram of an embodiment of the inventive current calculation system 40 for calculating a current I through a metering unit for a common rail pump 20 of an injection system for injecting fuel.
  • the current calculation system 40 has a current calculation unit 30 as shown in FIG. 2 and at least one further, second calculation unit 34.
  • the second calculation unit 34 is preferably configured to calculate the current I through the metering unit as a function of the actual resistance R (Ts) of the coil 21 and a supply voltage V bat supplying the coil 21 with voltage.
  • the current calculation system 40 may include a control unit 41.
  • the control unit 41 is configured to compare the current I calculated by the second calculation unit 34 with a reference current value Iref and to determine whether the current I flowing through the metering unit corresponds to a predetermined value. If the control unit 41 recognizes that the current I flowing through the metering unit does not correspond to the predetermined value Iref, then the control unit 41 can set the current I to the predetermined value by means of a PWM signal PWM
  • control unit 41 is coupled to the gate of the transistor 12. At this time, the control unit 41 controls the gate by means of the PWM (Pulse Width Modulation) signal PWM, wherein the control unit 41 adjusts the duty cycle by means of the PWM signal PWM to correct any deviations between the target value and the actual value of the current I by the metering unit.
  • PWM Pulse Width Modulation
  • the current calculation system 40 may have a memory device 35, which is set up for the temperature coefficient ⁇ of the coil wire of the coil 21 and / or the predetermined reference resistance R (Tref) of the coil 21 and / or the determined offset value OS to save.
  • the current calculation system 40 can be coupled to a communication bus 50 of the motor vehicle, which is suitable for transmitting the fuel temperature Tk measured by the fuel temperature sensor to the current calculation unit 30.
  • the communication bus is designed, for example, as a LIN bus, CAN bus or FlexRay bus.
  • FIG. 4 shows a schematic flow diagram of an exemplary embodiment of the method according to the invention for calculating the current I through the metering unit for the common rail pump 20 of the injection system for injecting fuel.
  • the method according to the invention will be described below with reference to the block diagram in FIG. 4 with reference to the schematic block diagram in FIG.
  • the embodiment of the inventive method according to FIG. 4 has the following method steps S1 to S5:
  • the material-specific temperature coefficient ⁇ of the coil wire used of the coil 21 of the metering unit of the injection system is provided.
  • a reference temperature Tref is provided. Tref for example 20 0 C.
  • the resulting reference resistance R (Tref) of the coil 21 is measured at the predetermined reference temperature Tref. In particular, this measurement is carried out in advance in a validation process.
  • the measured reference resistance R (Tref) is then provided as a parameter for the calculation of the current I through the coil 21.
  • the fuel temperature Tk of the fuel is measured in an inlet of the injection system by means of a temperature sensor, in particular during operation of the motor vehicle.
  • the coil temperature-dependent actual resistance R (Ts) of the coil 21 is determined in particular in the field in a plurality of motor vehicles as a function of the temperature coefficient ⁇ , the reference resistance R (Tref), the respectively measured fuel temperature Tk and the determined offset Value OS calculated.

Abstract

L'invention concerne une unité, un système et un procédé de calcul de courant. L'unité de calcul de courant, destinée au calcul du courant qui traverse une unité de dosage de carburant pour une pompe de système d'injection de carburant à rampe commune, comporte un moyen de calcul qui est conçu pour calculer une résistance réelle dépendant de la température d'une bobine de l'unité de dosage en fonction d'un coefficient de température d'un fil de la bobine, une résistance de référence prédéfinie de la bobine pour une température de référence, une mesure de température du carburant et une valeur de décalage donnée entre la température du carburant et la température de la bobine.
PCT/EP2008/065272 2008-01-17 2008-11-11 Unité, système et procédé de calcul de courant WO2009089937A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200810004877 DE102008004877A1 (de) 2008-01-17 2008-01-17 Stromberechnungseinheit, Stromberechnungssystem und Stromberechnungsverfahren
DE102008004877.1 2008-01-17

Publications (2)

Publication Number Publication Date
WO2009089937A2 true WO2009089937A2 (fr) 2009-07-23
WO2009089937A3 WO2009089937A3 (fr) 2010-01-14

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PCT/EP2008/065272 WO2009089937A2 (fr) 2008-01-17 2008-11-11 Unité, système et procédé de calcul de courant

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DE (1) DE102008004877A1 (fr)
WO (1) WO2009089937A2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140046619A1 (en) * 2011-03-03 2014-02-13 Andreas Heinrich Method for determining a temperature of fuel
US20180328304A1 (en) * 2017-05-10 2018-11-15 Ford Global Technologies, Llc Method and system for characterizing a port fuel injector

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015204096A1 (de) * 2015-03-06 2016-09-08 Robert Bosch Gmbh Verfahren zur Schadenserkennung bei einer Kraftstoffpumpe

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19729101A1 (de) * 1997-07-08 1999-01-14 Bosch Gmbh Robert System zum Betreiben einer Brennkraftmaschine insbesondere eines Kraftfahrzeugs
DE19913477A1 (de) * 1999-03-25 2000-10-05 Bosch Gmbh Robert Verfahren zum Betreiben einer Kraftstoffzuführeinrichtung einer Brennkraftmaschine insbesondere eines Kraftfahrzeugs
DE10016900A1 (de) * 2000-04-05 2001-11-08 Bosch Gmbh Robert Verfahren zur Regelung des in einem Druckspeicher eines Kraftstoffzumesssystems herrschenden Speicherdrucks
DE102006000357A1 (de) * 2005-07-21 2007-02-01 Denso Corp., Kariya Kraftstoffeinspritzsteuereinrichtung
DE102006029633A1 (de) * 2006-06-28 2008-01-03 Robert Bosch Gmbh Verfahren zum Betreiben eines Kraftstoffsystems einer Brennkraftmaschine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19729101A1 (de) * 1997-07-08 1999-01-14 Bosch Gmbh Robert System zum Betreiben einer Brennkraftmaschine insbesondere eines Kraftfahrzeugs
DE19913477A1 (de) * 1999-03-25 2000-10-05 Bosch Gmbh Robert Verfahren zum Betreiben einer Kraftstoffzuführeinrichtung einer Brennkraftmaschine insbesondere eines Kraftfahrzeugs
DE10016900A1 (de) * 2000-04-05 2001-11-08 Bosch Gmbh Robert Verfahren zur Regelung des in einem Druckspeicher eines Kraftstoffzumesssystems herrschenden Speicherdrucks
DE102006000357A1 (de) * 2005-07-21 2007-02-01 Denso Corp., Kariya Kraftstoffeinspritzsteuereinrichtung
DE102006029633A1 (de) * 2006-06-28 2008-01-03 Robert Bosch Gmbh Verfahren zum Betreiben eines Kraftstoffsystems einer Brennkraftmaschine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140046619A1 (en) * 2011-03-03 2014-02-13 Andreas Heinrich Method for determining a temperature of fuel
US20180328304A1 (en) * 2017-05-10 2018-11-15 Ford Global Technologies, Llc Method and system for characterizing a port fuel injector
US10760518B2 (en) * 2017-05-10 2020-09-01 Ford Global Technologies, Llc Method and system for characterizing a port fuel injector

Also Published As

Publication number Publication date
WO2009089937A3 (fr) 2010-01-14
DE102008004877A1 (de) 2009-07-23

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