EP2169213A2 - Startanlage für eine Brennkraftmaschine - Google Patents

Startanlage für eine Brennkraftmaschine Download PDF

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Publication number
EP2169213A2
EP2169213A2 EP09170112A EP09170112A EP2169213A2 EP 2169213 A2 EP2169213 A2 EP 2169213A2 EP 09170112 A EP09170112 A EP 09170112A EP 09170112 A EP09170112 A EP 09170112A EP 2169213 A2 EP2169213 A2 EP 2169213A2
Authority
EP
European Patent Office
Prior art keywords
signal output
fuel injection
pump
fuel
fuel pump
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
EP09170112A
Other languages
English (en)
French (fr)
Other versions
EP2169213A3 (de
EP2169213B1 (de
Inventor
Takeo Takahashi
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.)
Keihin Corp
Original Assignee
Keihin Corp
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Filing date
Publication date
Application filed by Keihin Corp filed Critical Keihin Corp
Publication of EP2169213A2 publication Critical patent/EP2169213A2/de
Publication of EP2169213A3 publication Critical patent/EP2169213A3/de
Application granted granted Critical
Publication of EP2169213B1 publication Critical patent/EP2169213B1/de
Active legal-status Critical Current
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
    • F02D41/30—Controlling fuel injection
    • F02D41/3082—Control of electrical fuel pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N11/00—Starting of engines by means of electric motors
    • F02N11/08—Circuits or control means specially adapted for starting of engines
    • F02N11/0862—Circuits or control means specially adapted for starting of engines characterised by the electrical power supply means, e.g. battery
    • 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
    • F02D2200/50—Input parameters for engine control said parameters being related to the vehicle or its components
    • F02D2200/503—Battery correction, i.e. corrections as a function of the state of the battery, its output or its type
    • 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
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/06—Introducing corrections for particular operating conditions for engine starting or warming up
    • F02D41/062—Introducing corrections for particular operating conditions for engine starting or warming up for starting

Definitions

  • the present invention relates to a control system for a fuel injection engine comprising: a fuel injection valve for injecting fuel; a fuel pump for supplying fuel to the fuel injection valve; a starter motor capable of transmitting starting power to a crankshaft; a generator connected to the crankshaft; a battery for supplying operating power to the fuel pump, the fuel injection valve, and the starter motor; and an electronic control unit for controlling operations of at least the fuel injection valve and the fuel pump so that control processing is disabled when a voltage of the battery is equal to or less than a predetermined reset voltage.
  • An engine control system for enabling operation of a fuel pump even in a state in which battery voltage is low when an engine is being started by cranking with a starter motor is known from Japanese Patent Application Laid-open No. 07-317620 .
  • an electronic control unit for controlling the operation of a fuel pump, etc. generally becomes incapable of control processing in a state in which the voltage of a battery reaches a predetermined reset voltage or lower.
  • the electronic control unit since the electronic control unit becomes incapable of control processing in a state in which the battery has deteriorated after a long term use, etc., even if the extent of the deterioration is small, it becomes difficult to start the engine.
  • the present invention has been accomplished in the light of such circumstances, and it is an object thereof to provide a control system for a fuel injection engine in which engine startability when a battery has deteriorated is enhanced.
  • a control system for a fuel injection engine comprising: a fuel injection valve for injecting fuel; a fuel pump for supplying fuel to the fuel injection valve; a starter motor capable of transmitting starting power to a crankshaft; a generator connected to the crankshaft; a battery for supplying operating power to the fuel pump, the fuel injection valve, and the starter motor; and an electronic control unit for controlling operations of at least the fuel injection valve and the fuel pump so that control processing is disabled when a voltage of the battery is equal to or less than a predetermined reset voltage, characterized in that the electronic control unit includes: prohibition signal output means for outputting a prohibition signal for prohibiting operation of the fuel pump by detecting starting of operation of the starter motor; permission signal output means for outputting a permission signal for permitting operation of the fuel pump by determining that a pump operation permission state has reached prior to fuel injection by the fuel injection valve after operation of the fuel pump is stopped in response to starting of operation of the starter motor, the pump operation permission
  • the permission signal output means determines whether or not a pump operation permission state has reached in which it is possible to avoid the battery voltage reaching a reset voltage or lower even if the fuel pump is operated.
  • the permission signal output means determines that there is such a state, drive of the fuel pump is started. Accordingly, it is possible to enhance the startability even when the battery has deteriorated at the time of starting the engine with the starter motor being operated, by avoiding control processing by the electronic control unit becoming disabled even by operation of the fuel pump.
  • control system for a fuel injection engine further comprising a starter switch for controlling operation of the starter motor, wherein the prohibition signal output means detects starting of operation of the starter motor based on a change in the switching mode of the starter switch.
  • starting of operation of the starter motor is detected based on a change in the switching mode of the starter switch, starting of operation of the starter motor can be detected reliably.
  • control system for a fuel injection engine further comprising voltage detection means for detecting a voltage of the battery, wherein the prohibition signal output means determines that operation of the starter motor has started according to a decrease in battery voltage detected by the voltage detection means to a predetermined prohibition threshold value or lower.
  • the invention since it is determined that operation of the starter motor has started according to a decrease in the battery voltage to a predetermined prohibition threshold value or lower, the invention can easily be applied to one in which operation of the starter motor is not controlled by an electronic control unit.
  • control system for a fuel injection engine further comprising a crank sensor for outputting a crank pulse that is dependent on rotation of the crankshaft, wherein based on the crank pulse the permission signal output means determines that the pump operation permission state has reached when a crank angle of the crankshaft reaches a predetermined value.
  • control system for a fuel injection engine further comprising voltage detection means for detecting a voltage of the battery, wherein the permission signal output means determines that the pump operation permission state has reached according to the battery voltage detected by the voltage detection means exceeding a predetermined permission threshold value.
  • the permission signal output means determines that the pump operation permission state has reached according to a predetermined time having elapsed after a prohibition signal has been outputted from the prohibition signal output means.
  • FIGS. 1 to 4 show a first embodiment of the present invention:
  • a crankshaft 15 is rotatably supported on a crankcase 12 of an engine main body 11 of a fuel injection engine, and a piston 16 slidably fitted into a cylinder block 13 joined to the crankcase 12 is connected to the crankshaft 15 via a connecting rod 17.
  • a starter motor 18 for transmitting power for starting to the crankshaft 15 at the time of starting is connected to the crankshaft 15 via a reduction mechanism 19, and a generator 20 that generates power in response to rotation of the crankshaft 15 is coaxially connected thereto.
  • An intake port 22 and an exhaust port 23 communicating with the combustion chamber 21 are provided in the cylinder head 14.
  • An intake valve 24 for switching between provision and blockage of communication of the intake port 22 with the combustion chamber 21 and an exhaust valve 25 for switching between provision and blockage of communication of the exhaust port 23 with the combustion chamber 21 are disposed in the cylinder head 14 so as to be capable of opening and closing, a spark plug 26 having a tip end part which faces the combustion chamber 21 is mounted on the cylinder head 14, and a spark coil 27 is connected to the spark plug 26.
  • An intake system 28 connected to the intake port 22 includes a throttle body 30 having an intake path 29 communicating with the intake port 22, a throttle valve 31 for opening and closing the intake path 29 is disposed in the throttle body 30 so as to be capable of opening and closing, and a fuel injection valve 32 for injecting fuel is attached to the throttle body 30.
  • Fuel within a fuel tank 33 is supplied to the fuel injection valve 32 from a fuel pump 34 disposed in a bottom part of the fuel tank 33.
  • Power for operation is supplied from a battery 35 to the fuel pump 34, the fuel injection valve 32, and the starter motor 18.
  • An electronic control unit 36 controls operations of at least the fuel injection valve 32 and the fuel pump 34, in this embodiment operation of the fuel injection valve 32, the fuel pump 34, and the starter motor 18 and timing of ignition of the spark plug 26 by the spark coil 27.
  • Inputted into the electronic control unit 36 are crank pulses from a crank sensor 38 fixedly disposed so as to face the outer periphery of a pulser 37 fixed to the crankshaft 15, a signal from a starter switch 39 for determining the timing of starting operation of the starter motor 18, and battery voltage from voltage detection means 40 for detecting the voltage of the battery 35.
  • a section of the electronic control unit 36 involved in control of the fuel pump 34 at the time of starting the engine includes: prohibition signal output means 41 for outputting a prohibition signal for prohibiting operation of the fuel pump 34 by detecting starting of operation of the starter motor 18; permission signal output means 42 for outputting a permission signal for permitting operation of the fuel pump 34 by determining that a pump operation permission state has reached in which it is possible to avoid the voltage of the battery 35 reaching a predetermined reset voltage or lower even by operation of the fuel pump 34 prior to fuel injection by the fuel injection valve 32 after operation of the fuel pump 34 has been stopped in response to starting of operation of the starter motor 18; and pump drive means 43 for driving the fuel pump 34 by stopping operation of the fuel pump 34 in response to a prohibition signal output from the prohibition signal means 42 and by starting operation of the fuel pump 34 in response to a permission signal output from the permission signal output means after a prohibition signal has been outputted.
  • the prohibition signal output means 41 detects starting of operation of the starter motor 18 based on a change in the switching mode of the starter switch 39 for controlling the operation of the starter motor 18, and the permission signal output means 42 determines, based on crank pulses outputted from the crank sensor 38 in response to rotation of the crankshaft 15, that a pump operation permission state has reached when the crank angle of the crankshaft 15 attains a predetermined value prior to starting of fuel injection from the fuel injection valve 32; for example, it determines that a pump operation permission state has reached when the piston 16 attains top dead center.
  • Such an electronic control unit 38 carries out control of operation of the fuel pump 34 at the time of starting the engine in accordance with the procedure shown in FIG. 3 ; in step S1 computation of a crank angle of the crankshaft 15 is carried out based on crank pulses output from the crank sensor 38, and in step S2 it is determined whether or not the crank angle has attained a predetermined value. That is, step S1 and step S2 are processing steps that are carried out by the permission signal output means 42, and when it is determined that the crank angle has not attained the predetermined value, the procedure moves on from step S2 to step S3.
  • step S3 in order to start operation of the starter motor 18, it is determined whether or not the starter switch 39 is in an ON state, and when it is determined that the starter switch 39 is in an OFF state, the procedure moves on to step S4.
  • step S4 it is determined whether or not a battery voltage VB detected by the voltage detection means 40 exceeds a predetermined value V1, for example 7V, and if it exceeds the predetermined value V1 the procedure moves from step S4 to step S5 and the count value of a counter is increased by only "1"; if in the following step S6 it is determined that the count value is equal to or less than "20" the procedure moves from step S6 to step S7 and the fuel pump 34 is operated, and if the count value exceeds "20” the procedure moves from step S6 to step S8 and operation of the fuel pump 34 is stopped.
  • the fuel pump 34 is operated as preliminary drive before operation of the starter motor 18 is started, and since computation processing by the electronic control unit 36 is carried out, for example, every 100 msec, the fuel pump 34 is preliminarily driven for a maximum of, for example, 2 sec.
  • step S3 the determination processing in step S3 is carried out by the prohibition signal output means 41, and when it is determined that the starter switch 39 for controlling operation of the starter motor 18 is in an ON state, the procedure moves from step S3 to step S8, and a prohibition signal for prohibiting operation of the fuel pump 34 is outputted.
  • step S2 it is determined that the crank angle has attained a predetermined value, a pump operation permission state has reached, and after it is confirmed in step S9 that the engine has not stalled, the procedure moves to step S7 and an operation permission signal is outputted.
  • the starter motor 18, the battery voltage VB, the fuel pump 34, and an engine rotational speed NE change as shown in FIG. 4 , and when it is confirmed that operation of the starter motor 18 has been started by the starter switch 39 at a time t1 after the fuel pump 34 has been preliminarily driven only for a period of less than 2 sec in a state in which the battery voltage VB exceeds the predetermined value V1, operation of the fuel pump 34 is stopped.
  • the battery voltage VB would rapidly decrease, as shown by the broken line, in response to starting of operation of the starter motor 18, but as described above by temporarily stopping operation of the fuel pump 34 it is possible to suppress the decrease in the battery voltage VB due to starting of operation of the starter motor 18.
  • the permission signal output means 42 determines whether or not a pump operation permission state has reached in which it is possible to avoid the voltage of the battery 35 reaching a reset voltage VR or lower (see FIG. 4 ) even by operation of the fuel pump 34, and if the permission signal output means 42 determines that there is such a state drive of the fuel pump 34 is started, and it is therefore possible to enhance the startability by avoiding the electronic control unit 36 becoming incapable of control processing even by operation of the fuel pump 34 even when the battery 35 has deteriorated at the time of starting the engine, on which the starter motor 18 is being operated.
  • FIG. 5 shows a control procedure at the time of starting an engine of a second embodiment of the present invention.
  • step S11 it is determined whether or not a battery voltage VB exceeds a predetermined prohibition threshold value V2 (see FIG. 4 of the first embodiment), and if it is determined that the battery voltage VB has decreased to the predetermined prohibition threshold value V2 or lower, prohibition signal output means 41 determines that operation of a starter motor 18 has started, and in step S12 a prohibition signal for prohibiting operation of a fuel pump 34 is outputted.
  • step S11 determines whether or not the battery voltage VB has exceeded the predetermined prohibition threshold value V2
  • the procedure moves from step S11 to step S13, and it is determined whether or not the battery voltage VB has exceeded a predetermined permission threshold value V3.
  • This permission threshold value V3 is set as a value that can avoid the battery voltage VB reaching a reset voltage VR or lower even by operation of the fuel pump 34 prior to fuel injection by a fuel injection valve 32 after operation of the fuel pump 34 is stopped, and is set so as to be larger than the prohibition threshold value V2.
  • step S13 If in step S13 it is determined that the battery voltage VB is equal to or lower than the predetermined permission threshold value V3, the procedure moves on to step S12, and if the battery voltage VB exceeds the predetermined permission threshold value V3, it is determined that a pump operation permission state has reached and the procedure moves on to step S14.
  • step S14 it is determined whether or not the engine has stalled, and when it is determined that it has not, in step S15 an operation permission signal is outputted.
  • step S16 the start count value of a start counter is increased only by "1"
  • step S17 it is determined that the start count value exceeds "20” the procedure moves on to step S12, and if the start count value is not greater than "20” the procedure moves on to step S15.
  • FIG. 6 shows a control procedure at the time of starting an engine of a third embodiment of the present invention.
  • step S21 in order to start operation of a starter motor 18, it is determined whether or not a starter switch 39 is in an ON state, and if it is determined that the starter switch 39 is in an OFF state, in step S22 it is determined whether or not the engine has stalled, and if it is determined that it has not an operation permission signal is outputted in step S23.
  • step S24 the stop count value of a stop counter is increased by only "1", in the following step S25 it is determined whether or not the stop count value exceeds "10", that is, whether or not it exceeds 1 sec, and if it is determined that it is no greater than 1 sec, the procedure moves on to step S26, and a prohibition signal for prohibiting operation of the fuel pump 34 is outputted.
  • step S25 it is determined that the stop count value exceeds "10" the procedure moves from step S25 to step S22.
  • step S27 the start count value of a start counter is increased by only "1"
  • step S28 it is determined that the start count value exceeds "20” the procedure moves on to step S26
  • step S23 it is determined that the start count value is equal to or less than "20” the procedure moves on to step S23.
  • prohibition signal output means (41) outputs a prohibition signal for prohibiting operation of the fuel pump (34) by detecting starting of operation of a starter motor;
  • permission signal output means (42) outputs a permission signal for permitting operation of the fuel pump (34) by determining that a pump operation permission state capable of avoiding a voltage of the battery reaching a predetermined reset voltage or lower even by operation of the fuel pump (34) has reached prior to fuel injection by the fuel injection valve after operation of the fuel pump (34) is stopped in response to starting of operation of the starter motor; and pump drive means (43) drives the fuel pump (34) according to a prohibition signal output from the prohibition signal output means (41) and a permission signal output from the permission signal output means (42). Accordingly, it is possible to enhance engine startability when a battery has deteriorated.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
EP09170112.8A 2008-09-24 2009-09-11 Startanlage für eine Brennkraftmaschine Active EP2169213B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2008244098A JP5113696B2 (ja) 2008-09-24 2008-09-24 燃料噴射式エンジンの制御装置

Publications (3)

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EP2169213A2 true EP2169213A2 (de) 2010-03-31
EP2169213A3 EP2169213A3 (de) 2015-02-25
EP2169213B1 EP2169213B1 (de) 2017-02-22

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3070310A1 (de) * 2015-03-18 2016-09-21 Toyota Jidosha Kabushiki Kaisha Steuerungsvorrichtung für ein fahrzeug
CN111075627A (zh) * 2019-12-23 2020-04-28 一汽解放汽车有限公司 一种车辆起动机的控制方法、装置和车辆

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7081213B2 (ja) * 2018-03-02 2022-06-07 株式会社デンソー ヒータ制御装置

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07317620A (ja) 1994-05-26 1995-12-05 Nippondenso Co Ltd 内燃機関用燃料ポンプの制御装置

Family Cites Families (7)

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Publication number Priority date Publication date Assignee Title
JPS60164638A (ja) * 1984-02-06 1985-08-27 Toyota Motor Corp 燃料噴射ポンプ用電磁弁の電流制御装置
JPS61184840U (de) * 1985-05-10 1986-11-18
JPS62131965A (ja) * 1985-12-05 1987-06-15 Toyota Motor Corp 内燃機関の燃料ポンプ制御装置
JP3974332B2 (ja) * 2001-01-10 2007-09-12 本田技研工業株式会社 電磁式燃料ポンプの制御方法
JP4207486B2 (ja) * 2002-07-31 2009-01-14 トヨタ自動車株式会社 内燃機関の診断方法及び診断装置
JP4263507B2 (ja) * 2003-03-13 2009-05-13 本田技研工業株式会社 車両用電力供給装置
JP4239730B2 (ja) * 2003-07-03 2009-03-18 株式会社デンソー 内燃機関用制御装置

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07317620A (ja) 1994-05-26 1995-12-05 Nippondenso Co Ltd 内燃機関用燃料ポンプの制御装置

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3070310A1 (de) * 2015-03-18 2016-09-21 Toyota Jidosha Kabushiki Kaisha Steuerungsvorrichtung für ein fahrzeug
CN105986916A (zh) * 2015-03-18 2016-10-05 丰田自动车株式会社 车辆的控制装置
US9752516B2 (en) 2015-03-18 2017-09-05 Toyota Jidosha Kabushiki Kaisha Control apparatus for vehicle
CN105986916B (zh) * 2015-03-18 2018-12-04 丰田自动车株式会社 车辆的控制装置
CN111075627A (zh) * 2019-12-23 2020-04-28 一汽解放汽车有限公司 一种车辆起动机的控制方法、装置和车辆

Also Published As

Publication number Publication date
EP2169213A3 (de) 2015-02-25
JP5113696B2 (ja) 2013-01-09
JP2010077822A (ja) 2010-04-08
EP2169213B1 (de) 2017-02-22

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