EP1442212A1 - Systeme d'injection dote d'une fonction d'urgence et procede d'urgence associe - Google Patents

Systeme d'injection dote d'une fonction d'urgence et procede d'urgence associe

Info

Publication number
EP1442212A1
EP1442212A1 EP02776875A EP02776875A EP1442212A1 EP 1442212 A1 EP1442212 A1 EP 1442212A1 EP 02776875 A EP02776875 A EP 02776875A EP 02776875 A EP02776875 A EP 02776875A EP 1442212 A1 EP1442212 A1 EP 1442212A1
Authority
EP
European Patent Office
Prior art keywords
pressure
control valve
control
pressure accumulator
injection system
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.)
Granted
Application number
EP02776875A
Other languages
German (de)
English (en)
Other versions
EP1442212B1 (fr
Inventor
Sebastian PÖTZEL
Gerhard Eser
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of EP1442212A1 publication Critical patent/EP1442212A1/fr
Application granted granted Critical
Publication of EP1442212B1 publication Critical patent/EP1442212B1/fr
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

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
    • F02D41/30—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
    • 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
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • F02D41/222—Safety or indicating devices for abnormal conditions relating to the failure of sensors or parameter detection devices
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
    • F02M59/366—Valves being actuated electrically
    • 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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
    • F02D2041/1433—Introducing closed-loop corrections characterised by the control or regulation method using a model or simulation of the system
    • 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
    • F02D41/222—Safety or indicating devices for abnormal conditions relating to the failure of sensors or parameter detection devices
    • F02D2041/223—Diagnosis of fuel pressure 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
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • F02D2041/227—Limping Home, i.e. taking specific engine control measures at abnormal conditions
    • 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
    • F02D2200/0604—Estimation of fuel pressure

Definitions

  • the present invention relates to an injection system for internal combustion engines with an emergency operation function and a method for maintaining emergency operation of such an injection system.
  • valve can branch off part of the fuel flow conveyed by the high-pressure pump and return it to a low-pressure area of the injection system when the desired fuel pressure is reached or exceeded.
  • the valve forwards the entire fuel flow delivered by the high-pressure pump to the pressure accumulator in order to achieve the desired pressure level in the pressure accumulator again as quickly as possible.
  • the valve arranged between the high-pressure pump and the pressure accumulator thus enables the fuel pressure prevailing in the pressure accumulator to be set, so that this valve is controlled by a control unit in accordance with the quantity of fuel to be injected.
  • the injection system according to the invention for an internal combustion engine comprises a pump, a pressure accumulator, a sensor for detecting the pressure in the pressure accumulator, a control valve arranged between the pump and the pressure accumulator, and a control unit.
  • the control valve can open or close a connection to a low pressure area.
  • the pressure in the pressure accumulator is regulated.
  • the control valve remains closed when the pressure in the pressure accumulator has not yet reached the desired value or the control valve is opened when the pressure 0 in the pressure accumulator exceeds a predetermined threshold value in order to discharge fuel from the high pressure area to the low pressure area.
  • the control or regulating unit is designed in such a way that when a fault occurs in the regulating circuit for regulating the pressure level in the pressure accumulator 5, it opens the regulating valve and thereby ensures an emergency operation function of the injection system. During the emergency operation, the pump continues to operate, which thereby continues Feeds fuel into the pressure accumulator. Despite the control valve opened in emergency operation and thus a connection to the low-pressure area, this quantity delivered is large enough to enable emergency operation of the internal combustion engine, since the opened control valve acts as a throttle. Thus, the invention takes place according to a control of the pump even in the presence of an error in the control loop for the pressure levels ⁇ control.
  • the control valve is preferably designed as an electrically operated volume control valve.
  • a coil of the electrical volume control valve is particularly preferably de-energized so that the volume control valve is open.
  • a valve closing body of the control valve is advantageously designed in such a way that it opens a passage in the direction of the pressure accumulator starting from a low pressure area.
  • the valve closing body is moved to open the passage in the suction direction when the pump draws the fuel through the control valve.
  • control valve In emergency operation mode, the control valve is preferably brought into its open position in the event of a sensor failure or a short circuit or an open circuit or a short circuit.
  • a non-return valve is arranged in the accumulator and fuel is sucked in through the control valve.
  • the pump is thus arranged in the fluid path between the control valve and the check valve.
  • the actuation of the control valve is also synchronized with the piston stroke of a pump designed as a single piston pump.
  • a separate inlet check valve is preferably provided, which is connected in parallel with the control valve, so that fuel is drawn in from the low-pressure region through the inlet check valve or both valves.
  • a control valve which can release or close a connection between an outlet-side area of a pump and a low-pressure area is opened by a control or control unit open if an error occurs in the pressure control of the pressure level in the pressure accumulator. This opening of the control valve when a fault occurs in the control circuit for regulating the pressure level in a pressure accumulator.
  • a fault in the control loop enables emergency operation, since the pump continues to be actuated so that it continues to deliver fuel to the pressure accumulator.
  • a certain fuel pressure can be built up in the pressure accumulator because the opened control valve acts as a throttle and the volume flow supplied by the pump is up to a certain pressure level greater than the volume flow flowing out through the opened control valve.
  • the pressure level of the pressure built up in emergency operation in the pressure accumulator depends on the amount of fuel injected by the injectors and on the engine speed. It is thus possible according to the invention that, for example, if a fault occurs, a vehicle can continue to drive into a workshop under its own power in emergency operation.
  • the method according to the invention is preferably carried out when an error occurs as a result of a short circuit, a line Interruption or a short circuit of a valve coil, the control valve is preferably designed as a volume-controlled solenoid valve.
  • An emergency operation function according to the invention is also possible if the error is a failure of a sensor for determining the pressure in the pressure accumulator.
  • a value of the pressure in the pressure accumulator is preferably determined from a map as a function of the engine speed and the amount of fuel injected.
  • a pressure value can be obtained even if the pressure sensor fails and in the control or. Control unit are processed.
  • power and speed limitation is advantageously active even during emergency operation, which can prevent misfires.
  • Figure 1 is a schematic representation of an injection system according to an embodiment of the present invention.
  • Figure 2 is a schematic representation of a map during emergency operation.
  • FIG. 1 shows a schematic structure of an injection system according to an exemplary embodiment of the present invention.
  • the injection system comprises a volume flow-controlled high-pressure pump 1, which is designed as a single-piston pump. Furthermore, a pressure accumulator 3 is provided, in which fuel is at a high level
  • Pressure is stored and passed to individual injectors 4, via which an injection of Fuel takes place in the combustion chambers of an internal combustion engine.
  • a control valve 2 is provided, which is designed as an electrically actuable volume control valve.
  • a pressure sensor 7 is provided on the pressure accumulator 3 for recording the pressure actually prevailing in the pressure accumulator 3.
  • the injection system includes a control or Control unit 8, which controls the control valve 2 in particular.
  • the control valve 2 is arranged between a low-pressure region 6 and the pressure accumulator 3, it being connected to the pressure accumulator 3 via a line 11.
  • a check valve 5 is arranged in front of the pressure accumulator 3 to prevent fuel from flowing back from the pressure accumulator 3 into the line 11.
  • the pump 1 is hydraulically arranged via a branch line 9 between the control valve 2 and the check valve 5 (see FIG. 1) and draws fuel from the low-pressure line ⁇ through the control valve 2. Pump 1 thus works as a plunger pump.
  • the control valve 2 is designed as an outward opening valve, i.e. The stroke of the control valve 2 takes place starting from the closed valve in the direction of the line 11, and closes or opens a passage 10 between the low-pressure line 6 and the line 11. That the direction of the opening stroke of the control valve 2 is equal to the direction of flow of the fuel during the intake through the control valve.
  • the function of the injection system according to the invention is described below.
  • the high-pressure pump 1 draws fuel from the low-pressure line 6 through the passage 10, which is opened by the control valve 2. Since the high-pressure pump is a single-piston pump, the control of the control valve 2 is synchronized with the piston stroke in order to have the lowest possible losses. If the
  • the control valve 2 closes the passage 10 so that fuel is fed into the pressure accumulator 3 via the check valve 5.
  • the fuel is guided in a known manner from the pressure accumulator 3 to injectors 4, which inject the fuel into combustion chambers of the internal combustion engine.
  • a predetermined pressure should always be present in the pressure accumulator 3. This is detected by means of the pressure sensor 7, which emits corresponding signals to the control or regulating unit 8.
  • fuel delivery by the piston pump is reduced (e.g. by reducing the drive speed) or prevented or the control valve 2 is controlled accordingly and also opened during the pressure stroke of the pump 1, so that fuel from the line 11 back to the low pressure area flows.
  • control or regulating unit 8 is designed such that if a fault occurs in the regulating circuit, the regulating valve 2 is actuated in such a way that it is constantly open, so that a permanent connection between the line 11 and the Low pressure area 6 is present. Since the control valve 2 is designed as an electric valve, the open position can be achieved simply by de-energizing the coil of the valve 2.
  • control valve 2 is designed as an outward opening valve, the valve closing body can move freely when the coil is de-energized, so that after the suction stroke of the piston pump 1 has been completed, the passage 10 is closed due to the pressure build-up in the line 11 and
  • Fuel can be fed into the pressure accumulator 3 (see FIG. 1).
  • the pressure build-up in the pressure accumulator 3 during emergency operation is supported by the freely movable valve closing body 13 by closing the passage 10 during the pressure stroke, as a result of which higher pressures in the pressure accumulator 3 are possible.
  • the error in the control circuit can be in particular in the area of the control valve 2, such as, for example, due to a short circuit, an open circuit or a turn of the valve coil, or an error in the pressure sensor 7, so that no signals from the pressure sensor 7 Control unit 8 can be supplied.
  • the pressure prevailing in emergency operation in the pressure accumulator 3 can be determined, for example, from a map as shown schematically in FIG. 2 as a function of the engine speed and the amount of fuel injected by the injectors 4. The value obtained in this way can therefore be processed further by the control unit 8. For this purpose, such a map only has to be stored in advance in a memory for the control unit.
  • an injection system with a simply constructed emergency operation is thus provided.
  • the limp-home operation can be maintained by designing the control and regulating unit 8, which is designed such that it opens the regulating valve 2 when a fault occurs in the regulating circuit for regulating the pressure level in the pressure accumulator 3.
  • the pump 1 can still convey a volume flow into the pressure accumulator 3 and even build up a low pressure there, which enables emergency operation of the internal combustion engine.
  • FIG. 1 A further variant of the injection system according to the invention is also shown in broken lines in FIG.
  • an inlet check valve 12 can be provided parallel to the control valve 2, via which the piston pump sucks in fuel from the low-pressure region 6.
  • the control valve 2 can also be designed as a valve opening in the direction of the low-pressure region.
  • the high-pressure pump can not only be designed as a single-piston pump, but that multi-piston pumps can also be used.
  • the present invention thus relates to an injection system for an internal combustion engine with a pump 1, a pressure accumulator 3, a sensor 7 for detecting the pressure in the pressure accumulator 3, a control valve 2 and a control or regulating unit 8.
  • the control or regulating unit 8 regulates the pressure in the pressure accumulator 3 by releasing or closing a connection to a low-pressure area 6.
  • the Steuer max. The control unit has an emergency operation control in such a way that the control valve is set to its open position when an error occurs in the control circuit.

Abstract

La présente invention concerne un système d'injection destiné à un moteur à combustion interne et comprenant une pompe (1), un accumulateur de pression (3), un capteur (7) destiné à la détection de la pression régnant dans l'accumulateur de pression (3), une soupape de réglage (2) et une unité de commande et de réglage (8). L'unité de commande et de réglage règle la pression de l'accumulateur de pression (3) en ouvrant ou en fermant une conduite allant vers une zone basse pression (6). L'unité de commande et de réglage présente une commande d'urgence de telle façon qu'à l'apparition d'un défaut dans le circuit de réglage, la soupape de réglage passe en position ouverte.
EP02776875A 2001-11-09 2002-11-06 Systeme d'injection dote d'une fonction d'urgence et procede d'urgence associe Expired - Fee Related EP1442212B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10155247 2001-11-09
DE10155247A DE10155247B4 (de) 2001-11-09 2001-11-09 Einspritzanlage mit Notlauffunktion
PCT/DE2002/004115 WO2003040548A1 (fr) 2001-11-09 2002-11-06 Systeme d'injection dote d'une fonction d'urgence et procede d'urgence associe

Publications (2)

Publication Number Publication Date
EP1442212A1 true EP1442212A1 (fr) 2004-08-04
EP1442212B1 EP1442212B1 (fr) 2005-02-16

Family

ID=7705301

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02776875A Expired - Fee Related EP1442212B1 (fr) 2001-11-09 2002-11-06 Systeme d'injection dote d'une fonction d'urgence et procede d'urgence associe

Country Status (4)

Country Link
US (1) US6948480B2 (fr)
EP (1) EP1442212B1 (fr)
DE (2) DE10155247B4 (fr)
WO (1) WO2003040548A1 (fr)

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Also Published As

Publication number Publication date
DE10155247A1 (de) 2003-05-28
DE50202300D1 (de) 2005-03-24
DE10155247B4 (de) 2006-08-24
WO2003040548A1 (fr) 2003-05-15
US20040200456A1 (en) 2004-10-14
US6948480B2 (en) 2005-09-27
EP1442212B1 (fr) 2005-02-16

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