WO2015125208A1 - Système d'alimentation en carburant - Google Patents

Système d'alimentation en carburant Download PDF

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Publication number
WO2015125208A1
WO2015125208A1 PCT/JP2014/053756 JP2014053756W WO2015125208A1 WO 2015125208 A1 WO2015125208 A1 WO 2015125208A1 JP 2014053756 W JP2014053756 W JP 2014053756W WO 2015125208 A1 WO2015125208 A1 WO 2015125208A1
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WIPO (PCT)
Prior art keywords
fuel
pressure
supply
controller
engine
Prior art date
Application number
PCT/JP2014/053756
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English (en)
Japanese (ja)
Inventor
南　亘
荒井　康
律文 小出
健太郎 糸賀
祥司 山口
拓志 中本
Original Assignee
日立建機株式会社
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Priority to PCT/JP2014/053756 priority Critical patent/WO2015125208A1/fr
Publication of WO2015125208A1 publication Critical patent/WO2015125208A1/fr

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    • 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
    • F02D41/02—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
    • 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
    • F02D2041/224—Diagnosis of the fuel system
    • 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
    • F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
    • F02D2200/101—Engine speed
    • 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

Definitions

  • the present invention relates to a fuel supply system used for an engine of a work vehicle such as a hydraulic excavator.
  • a fuel injection device used for an engine of a work vehicle such as a hydraulic excavator generally includes a nozzle for injecting fuel and an injection valve for opening and closing the nozzle. Further, a system (fuel supply system) that supplies fuel to a combustion chamber of an engine using this fuel injection device is known (see, for example, Patent Document 1).
  • a high-pressure pump sucks up fuel from a fuel tank and pressurizes it into high-pressure fuel.
  • the high pressure pump supplies high pressure fuel to the fuel pressure accumulator.
  • the fuel pressure accumulator stores the high-pressure fuel supplied from the high-pressure pump in a high-pressure state, and supplies a part of the high-pressure fuel to the fuel injection device.
  • the high pressure fuel is injected into the combustion chamber of the engine by opening the injection valve and opening the injection hole.
  • the conventional fuel supply system as disclosed in Patent Document 1, it is determined whether or not the operation of the fuel injection device is defective when the engine is started.
  • the conventional fuel supply system determines that the operation of the fuel injection device is defective, it determines that the injection amount is insufficient and increases the supply time of the high-pressure fuel supplied to the fuel injection device to increase the high pressure. Increase fuel supply.
  • the conventional fuel supply system solves the shortage of the injection amount.
  • the injection amount is insufficient when the load on the engine becomes high, or when the components of the fuel injection device wear out and the leakage amount of high-pressure fuel increases. It is possible to cope with this case.
  • the cause of the malfunction of the fuel injection device may be due to impurities in the fuel. This case will be specifically described.
  • the nozzle hole of the fuel injection device is clogged with impurities in the fuel, the impurities adhere to the injection valve. As a result, the injection valve does not operate smoothly, and the operation of the fuel injection device becomes defective.
  • the conventional fuel supply system only increases the supply time of the high-pressure fuel supplied to the fuel injection device. Therefore, the fuel injection device does not recover the lubrication operation of the injection valve, so that the shortage of the injection amount is not solved and sufficient fuel cannot be supplied to the combustion chamber of the engine.
  • the present invention has been made in view of the above problems, and an object of the present invention is to provide a fuel supply system capable of increasing the supply capacity of fuel supplied to a combustion chamber of an engine when the engine is started.
  • the fuel supply system of the present invention comprises: A high-pressure pump connected to the fuel tank by a first supply pipe, and sucking up the fuel in the fuel tank from the fuel tank via the first supply pipe and pressurizing the fuel tank into a high-pressure fuel; A fuel pressure accumulator connected to the high pressure pump by a second supply pipe and storing the high pressure fuel supplied from the high pressure pump in a high pressure state; An injection valve that is connected to the fuel pressure storage device by a third supply pipe and is supplied with the high-pressure fuel from the fuel pressure storage device, and is opened by opening the injection valve to inject the high-pressure fuel into the combustion chamber of the engine.
  • a fuel injection device having an injection hole;
  • a fuel supply valve connected to the first supply pipe and controlling the supply pressure of the high-pressure fuel supplied to the fuel injection device by controlling the supply pressure of the fuel supplied to the high-pressure pump;
  • a detection device for detecting an operating state of the fuel injection device;
  • a controller for controlling the operation of the injection valve and the operation of the fuel supply valve according to the detection result of the detection device;
  • a key switch input detection device that is connected to the controller and detects the presence or absence of an input of the key switch of the engine; When the controller determines that there is an input from the key switch by the key switch input detection device, the controller determines whether the operation of the fuel injection device is defective by the detection device, and the fuel injection device When it is determined that the operation of the high pressure fuel is poor, the operation of the fuel supply valve is controlled to increase the supply pressure of the high pressure fuel by increasing the supply pressure of the fuel supplied to the high pressure pump.
  • the fuel supply system of the present invention increases the supply pressure of the high-pressure fuel supplied to the fuel injection device when it is determined that the operation of the fuel injection device is defective.
  • the fuel supply system of the present invention removes impurities from the injection valve using the supply pressure of the high-pressure fuel even if the fuel injection device becomes defective due to adhesion of impurities in the fuel to the injection valve. It becomes possible to do.
  • the impurities removed from the injection valve are melted by the temperature of the high-pressure fuel and injected together with the high-pressure fuel from the injection hole, so that the lubricating operation of the injection valve is restored. Therefore, the fuel supply system of the present invention can solve the shortage of the injection amount even when the cause of the malfunction of the fuel injection device is due to impurities in the fuel.
  • the supply pressure of the high-pressure fuel supplied to the fuel injection device is increased by increasing the supply pressure of the high-pressure fuel even if the injection time is the same as the conventional fuel supply system. Therefore, the fuel supply system of the present invention has a shortage of injection amount due to a shortage of injection amount due to a high load on the engine or due to wear of components of the fuel injection device and an increase in the amount of high-pressure fuel leakage. Even in this case, the shortage of the injection amount can be resolved as in the conventional fuel supply system. Therefore, the fuel supply system of the present invention can increase the fuel supply capacity to the combustion chamber of the engine when the engine is started.
  • FIG. 1 is a block diagram of a fuel supply system showing an embodiment of the present invention. It is a flowchart which shows the fuel supply control process at the time of engine starting by the controller of the fuel supply system of the embodiment. It is a figure which shows the relationship between the actual rotation speed of the engine at the time of engine starting in this Embodiment, and the supply pressure of a high pressure fuel. It is a figure which shows the relationship between the actual rotation speed of the engine at the time of engine starting in this Embodiment, and the supply pressure of a high pressure fuel.
  • FIG. 1 is a block diagram of a fuel supply system 1 showing an embodiment of the present invention.
  • the fuel supply system 1 is used for an engine of a work vehicle such as a hydraulic excavator.
  • a solid line flow indicates a fuel flow
  • a dotted line flow indicates a control signal flow.
  • the fuel supply system 1 includes a fuel tank 2, a high-pressure pump 3, a fuel pressure accumulation device 4, and a fuel injection device 5.
  • the fuel tank 2 stores the engine fuel.
  • the high-pressure pump 3 is connected to the fuel tank 2 by a first supply pipe 21.
  • the high-pressure pump 3 sucks up and pressurizes the fuel in the fuel tank 2 from the fuel tank 2 through the first supply pipe 21 to form high-pressure fuel, and supplies the high-pressure fuel to the fuel pressure accumulator 4. is there.
  • the fuel pressure accumulator 4 is connected to the high-pressure pump 3 through a second supply pipe 22.
  • the fuel accumulator 4 stores the high-pressure fuel supplied from the high-pressure pump 3 via the second supply pipe 22 in a high-pressure state and supplies a part of the high-pressure fuel to the fuel injection device.
  • the fuel injection device 5 injects high-pressure fuel supplied from the fuel accumulator 4 into the combustion chamber 102 of the engine 101.
  • This fuel injection device 5 is connected to the fuel pressure accumulator 4 by a third supply pipe 23.
  • the third supply pipe 23 is connected to the main body 51.
  • a nozzle hole 52 is provided at the tip of the main body 51.
  • An injection valve 53 is provided inside the main body 51. This injection valve 53 opens and closes the injection hole 52.
  • the fuel injection device 5 injects high-pressure fuel into the combustion chamber 102 of the engine 101 by opening the injection valve 53 and opening the injection hole 52.
  • a fuel return pipe (not shown) is connected to the main body 51. This return pipe is connected to the fuel tank 2. The fuel leaking from the fuel injection device 5 is returned to the fuel tank 2 through this return pipe.
  • the fuel supply valve 6 is connected to the first supply pipe 21.
  • the fuel supply valve 6 controls the supply pressure of the high-pressure fuel supplied to the fuel injection device 5 by controlling the supply pressure of the fuel supplied to the high-pressure pump 3.
  • a fuel pressure gauge 7 and a fuel thermometer 8 are connected to the fuel pressure accumulator 4.
  • the fuel pressure gauge 7 measures the pressure of the high pressure fuel stored in the fuel pressure accumulator 4 (supply pressure of the high pressure fuel).
  • the fuel thermometer 8 measures the temperature of the high-pressure fuel stored in the fuel pressure accumulator 4.
  • a safety valve 9 is connected to the fuel pressure accumulator 4.
  • the safety valve 9 prevents the fuel pressure accumulating device 4 from being damaged due to an excessive increase in the supply pressure of the high-pressure fuel. This content will be specifically described.
  • the safety valve 9 discharges the high-pressure fuel and lowers the supply pressure of the high-pressure fuel when the supply pressure of the high-pressure fuel exceeds the operating pressure of the safety valve 9.
  • the operating pressure of the safety valve 9 is an abnormal pressure that may cause a failure in the fuel accumulator due to the supply pressure of the high-pressure fuel.
  • the fuel supply system 1 includes a controller 10.
  • This controller 10 controls the drive of the high-pressure pump 3, controls the operation of the injection valve 53 of the fuel injection device 5, and controls the operation of the fuel supply valve 6.
  • the controller 10 is connected to an engine speed detector 11 that detects the actual engine speed.
  • the controller 10 is connected to a key switch input detection device 12 that detects the presence or absence of an input of an engine key switch.
  • the high-pressure pump 3 is driven by the controller 10, and the high-pressure pump 3 sucks up the fuel in the fuel tank 2 and pressurizes it to make high-pressure fuel.
  • the high pressure pump 3 supplies the high pressure fuel to the fuel pressure accumulator 4.
  • the fuel accumulator 4 stores the high-pressure fuel supplied from the high-pressure pump 3 in a high-pressure state and supplies a part of the high-pressure fuel to the injection valve 53 of the fuel injector 5.
  • the controller 10 opens the injection hole 52 by opening the injection valve 53. As a result, high-pressure fuel is injected from the injection hole 52 into the combustion chamber 102 of the engine 101.
  • controller 10 controls the injection and the injection amount by controlling the operation of the injection valve 53 and the operation of the fuel supply valve 6 according to the actual engine speed detected from the engine speed detection device 11. Yes.
  • Step S1 The controller 10 uses the key switch input detection device 12 to determine whether or not the key switch is input.
  • Step S2 If the controller 10 determines in step S1 that the key switch is input (the determination result in step S1 is YES), the fuel pressure gauge 7 causes the high-pressure fuel supply pressure to be equal to or higher than the operating pressure of the high-pressure pump 3. Determine whether or not.
  • the operating pressure of the high pressure pump 3 is the minimum pressure necessary for the operation of the high pressure pump 3.
  • a specific value of the operating pressure of the high-pressure pump 3 is, for example, 20 MPa.
  • step S2 When the supply pressure of the high-pressure fuel is lower than the operating pressure of the high-pressure pump 3 in step S2 (the determination result in step S2 is NO), the controller 10 determines that the high-pressure pump 3 is not operating and reports an abnormality. (Step S10), the control process is terminated.
  • Step S3 When the high-pressure fuel supply pressure is equal to or higher than the operating pressure of the high-pressure pump 3 (YES in step S2), the controller 10 determines whether the high-pressure fuel supply pressure is equal to or higher than the operating pressure of the safety valve 9 by the fuel pressure gauge 7. Determine whether.
  • step S3 When the controller 10 determines in step S3 that the supply pressure of the high-pressure fuel is equal to or higher than the operating pressure of the safety valve 9 (the determination result in step S3 is YES), the controller 10 determines that there is an abnormality in the fuel pressure accumulator 4 and abnormal. (Step S10), and the control process is terminated. In this case, the safety valve 9 operates to discharge high-pressure fuel. As a result, the supply pressure of the high-pressure fuel becomes less than the operating pressure of the safety valve 9.
  • Step S4 If the controller 10 determines in step S3 that the supply pressure of the high-pressure fuel is lower than the operating pressure of the safety valve 9 (the determination result in step S3 is NO), the controller 10 changes the operating state of the fuel supply valve 6 for a predetermined time (X seconds). ) To maintain the supply pressure of the high-pressure fuel for a predetermined time (X seconds).
  • Step S5 the controller 10 uses the engine speed detection device 11 to determine whether or not the actual engine speed is equal to or higher than the target speed.
  • the engine target speed is the minimum engine speed required for starting the engine.
  • This target rotational speed is a standard for determining whether or not the operation of the fuel injection device 5 is defective.
  • a specific value of the target rotational speed is, for example, 500 rpm.
  • step S5 determines in step S5 that the actual engine speed is greater than or equal to the target engine speed (the determination result in step S5 is YES), the controller 10 determines that the engine has started and ends the control process.
  • Step S6 When the controller 10 determines in step S5 that the actual engine speed is less than the target engine speed (NO in step S5), the controller 10 controls the operation of the fuel supply valve 6 to supply the high-pressure fuel supply pressure. Raise.
  • Step S7 Subsequently, the controller 10 maintains the operating state of the fuel supply valve 6 for a predetermined time (X seconds), thereby maintaining the supply pressure of the high-pressure fuel for a predetermined time (X seconds).
  • Step S8 the controller 10 uses the engine speed detection device 11 to determine whether or not the actual engine speed is equal to or higher than the target speed.
  • This target rotational speed is the same as the target rotational speed set in step S5.
  • step S8 determines in step S8 that the actual engine speed is equal to or higher than the target engine speed (YES in step S8), the controller 10 determines that the engine has started and ends the control process.
  • Step S9 When the controller 10 determines in step S8 that the actual engine speed is less than the target engine speed (the determination result in step S8 is NO), the fuel pressure gauge 7 causes the supply pressure of the high-pressure fuel to operate the safety valve 9. Judge whether pressure is over or not.
  • Step S10 If the controller 10 determines in step S9 that the supply pressure of the high-pressure fuel is equal to or higher than the operating pressure of the safety valve 9 (YES in step S9), the controller 10 determines that there is an abnormality in the fuel pressure accumulator 4 and causes an abnormality. To terminate the control process. In this case, the safety valve 9 operates to discharge high-pressure fuel. As a result, the supply pressure of the high-pressure fuel becomes less than the operating pressure of the safety valve 9.
  • step S9 determines in step S9 that the supply pressure of the high-pressure fuel is less than the operating pressure of the safety valve 9 (the determination result in step S9 is NO)
  • the controller 10 performs the processing in steps S6 to S9 again.
  • the controller 10 further increases the supply pressure of the high-pressure fuel and maintains the pressure for X seconds. Subsequently, the controller 10 determines whether or not the actual engine speed is equal to or higher than the target engine speed. When the controller 10 determines that the actual engine speed is equal to or higher than the target engine speed, the controller 10 ends the control process. When the controller 10 determines that the actual engine speed is less than the target engine speed, It is determined whether the supply pressure is equal to or higher than the operating pressure of the safety valve 9. When the controller 10 determines that the supply pressure of the high-pressure fuel is equal to or higher than the operating pressure of the safety valve 9, the controller 10 notifies the abnormality and ends the control process. On the other hand, when the controller 10 determines that the supply pressure of the high-pressure fuel is lower than the operating pressure of the safety valve 9, the controller 10 performs the processes of steps S6 to S9 again.
  • the controller 10 increases the high-pressure fuel supply pressure while the high-pressure fuel supply pressure is lower than the operating pressure of the safety valve 9 when the actual engine speed does not reach the target rotation speed. Specifically, the controller 10 increases the high-pressure fuel supply pressure by 20 MPa every X seconds.
  • the fuel supply system 1 uses the supply pressure of the high-pressure fuel to remove impurities even if the operation of the fuel injection device 5 becomes defective due to the impurities in the fuel adhering to the injection valve 53. It becomes possible to remove from the injection valve 53.
  • the impurities removed from the injection valve 53 are melted by the temperature of the high-pressure fuel and injected from the injection hole 52 together with the high-pressure fuel, so that the lubricating operation of the injection valve 53 is restored. Therefore, the fuel supply system 1 of the present embodiment can solve the shortage of the injection amount even when the cause of the malfunction of the fuel injection device 5 is due to impurities in the fuel.
  • the fuel supply system 1 of the present embodiment increases the supply amount of the high-pressure fuel supplied to the fuel injection device 5 even when the injection time is the same as that of the conventional fuel supply system by increasing the supply pressure of the high-pressure fuel. . Therefore, in the fuel supply system 1 of the present embodiment, the injection amount is insufficient due to a high load on the engine 101, or the components of the fuel injection device 5 are worn and the amount of fuel leakage increases. Even when the injection amount is insufficient, the shortage of the injection amount can be solved as in the conventional fuel supply system.
  • the fuel supply system 1 includes an injection valve due to an insufficient amount of injection due to a high load on the engine 101, an injection amount insufficient due to an increase in the amount of fuel leakage, and an injection valve due to impurities in the fuel. It is possible to deal with any of the cases where the injection amount is insufficient due to the insufficient operation of 53. Therefore, the fuel supply system 1 of the present embodiment can increase the supply capability of the fuel supplied to the combustion chamber 102 of the engine 101 when the engine is started.
  • the fuel supply system 1 of the present embodiment uses the engine speed detection device 11 as a detection device that detects the operating state of the fuel injection device 5.
  • This engine speed detection device 11 is already mounted on the work vehicle. Therefore, the fuel supply system 1 according to the present embodiment does not require a new detection device for detecting the operating state of the fuel injection device 5, so that the system can be constructed at a reduced cost.
  • the fuel supply system 1 of the present embodiment uses the fuel pressure gauge 7 so that the supply pressure of the high-pressure fuel is less than an abnormal pressure (below the operating pressure of the safety valve 9) that may cause a failure in the fuel pressure accumulator 4.
  • the fuel supply system 1 of the present embodiment can prevent the fuel pressure accumulator 4 from being broken even if the supply pressure of the high-pressure fuel is increased, and the usability is improved.
  • the controller 10 when the controller 10 repeatedly performs the processing from step S6 to step S9, the controller 10 gradually increases the supply pressure of the high-pressure fuel every X seconds (stepwise). For this reason, it is possible to solve the shortage of injection amount without significantly reducing the fuel consumption as compared with the case where the supply pressure of the high-pressure fuel is rapidly increased. Therefore, the fuel supply system 1 of the present embodiment can increase the supply capability of the fuel supplied to the combustion chamber 102 of the engine 101 when the engine is started, and can suppress a decrease in fuel consumption.
  • the elapsed time is set on the horizontal axis, and the supply pressure of high-pressure fuel is set on the left vertical axis.
  • the operating pressure of the safety valve 9 is set to 110 MPa.
  • the actual rotational speed of the engine is set on the right vertical axis.
  • the target engine speed is set to 500 rpm.
  • Graph A shows the change over time of the supply pressure of the high-pressure fuel.
  • Graph B shows the change over time of the actual engine speed.
  • the controller 10 maintains the supply pressure (40 MPa) for X seconds when the supply pressure of the high-pressure fuel is initially 40 MPa when the engine is started.
  • controller 10 determines that the actual engine speed is less than the target engine speed after maintaining the high-pressure fuel supply pressure (40 MPa) for X seconds, the controller 10 increases the high-pressure fuel supply pressure to 60 MPa, Supply pressure (60 MPa) is maintained for X seconds.
  • the controller 10 determines that the actual engine speed is less than the target engine speed after maintaining the high-pressure fuel supply pressure (60 MPa) for X seconds, the controller 10 increases the high-pressure fuel supply pressure to 80 MPa, Supply pressure (80 MPa) is maintained for X seconds.
  • the controller 10 gradually increases the supply pressure of the high-pressure fuel every X seconds. Specifically, the controller 10 increases the high-pressure fuel supply pressure by 20 MPa every X seconds.
  • the controller 10 determines that the actual engine speed does not exceed the target engine speed even when the supply pressure of the high-pressure fuel is increased and the supply pressure is equal to or higher than the operating pressure (110 MPa) of the safety valve 9, the safety valve 9 operates to stop the pressure increase.
  • the controller 10 gradually increases the supply pressure of the high-pressure fuel every X seconds as in the case of FIG.
  • the controller 10 raises the supply pressure of the high-pressure fuel to 80 MPa and maintains it for X seconds
  • the actual engine speed exceeds the target engine speed (500 rpm).
  • the timing of the actual valve opening operation matches the control timing of the valve opening operation of the injection valve 53 by the controller 10, and the engine starts.
  • the controller 10 maintains the supply pressure (80 MPa) at this time for Y seconds, ends the control process at the time of engine start, and returns to the normal control process.
  • the normal control process is a fuel supply control process after engine startup (during engine operation).
  • the controller 10 maintains the supply pressure of the high-pressure fuel for a predetermined time (X seconds, Y seconds), so that even if the impurities attached to the injection valve 53 are sticky, the impurities are supplied to the high-pressure fuel. It can be reliably removed by the pressure. Therefore, the fuel supply system 1 according to the present embodiment can reliably eliminate the shortage of the injection amount at the time of starting the engine, and can reliably increase the supply capability of the fuel supplied to the combustion chamber of the engine.
  • the time for maintaining the supply pressure of the high-pressure fuel (X seconds, Y seconds) can be arbitrarily set.
  • the temperature of the high-pressure fuel supplied to the fuel injection device 5 is measured by the fuel thermometer 8, and the high-pressure fuel is supplied according to the change in the temperature of the high-pressure fuel obtained by the measurement.
  • a method for setting the time for maintaining the pressure will be described.
  • the controller 10 determines that the temperature of the high-pressure fuel has risen using the fuel thermometer 8, the controller 10 controls the operation of the fuel supply valve 6 to extend the time for maintaining the supply pressure of the high-pressure fuel. As a result, the supply amount of the high-pressure fuel supplied to the fuel injection device 5 increases, so that the shortage of the injection amount can be compensated.
  • the controller 10 determines that the temperature of the high pressure fuel has decreased using the fuel thermometer 8
  • the controller 10 controls the operation of the fuel supply valve 6 to shorten the time for maintaining the supply pressure of the high pressure fuel. Therefore, since the supply amount of the high-pressure fuel supplied to the fuel injection device 5 is suppressed, it is possible to suppress the high-pressure fuel from being unnecessarily injected.
  • the fuel supply system 1 changes the time for maintaining the supply pressure of the high-pressure fuel in accordance with the change in the temperature of the high-pressure fuel, thereby responding to the amount of leakage of the high-pressure fuel in the fuel injection device 5. It becomes possible to control the supply amount of the high-pressure fuel. Therefore, the fuel supply system 1 of the present embodiment can efficiently supply fuel to the combustion chamber of the engine.
  • the controller 10 may perform the following control process when the supply pressure of the high-pressure fuel exceeds the operating pressure of the safety valve 9 before the actual engine speed reaches the target engine speed.
  • the controller 10 determines from the fuel pressure gauge 7 that the supply pressure of the high pressure fuel has reached the operating pressure of the safety valve 9, the controller 10 controls the operation of the fuel supply valve 6 to lower the supply pressure of the high pressure fuel by one step. Maintain at supply pressure for additional X seconds.
  • the amount of high-pressure fuel supplied to the fuel injection device 5 is increased, so it is possible to cope with a case where the injection amount is insufficient due to a high load on the engine and a case where the injection amount is insufficient due to an increase in the leakage amount of high-pressure fuel. can do.
  • the fuel pressure gauge 7 and the fuel thermometer 8 are connected to the fuel pressure accumulator 4.
  • the fuel pressure gauge 7 and the fuel thermometer 8 are connected to the second supply pipe 22 or the third supply. It may be connected to the tube 23.
  • the engine speed detection device 11 is used as a detection device for detecting the operation state of the fuel injection device 5.
  • this detection device is not limited to the engine speed detection device 11.
  • a detection device that detects the voltage of the battery of the cell motor may be used. When this detection device is used, it is determined whether or not the operation of the fuel injection device 5 is defective from the change in the voltage of the battery before and after the start of the cell motor.
  • the operating pressure of the safety valve 9 is used as an abnormal pressure that may cause a failure in the fuel pressure accumulator 4.
  • the abnormal pressure is not limited to the operating pressure of the safety valve 9.
  • the fuel supply system may set the abnormal pressure in the controller 10 without using the safety valve 9.
  • the controller 10 controls the operation of the fuel supply valve 6 to lower the supply pressure when the supply pressure of the high-pressure fuel reaches an abnormal pressure. Thereby, the fuel supply system can prevent a failure of the fuel pressure accumulator 4.

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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)

Abstract

L'invention porte sur un système d'alimentation en carburant qui peut améliorer la capacité d'alimentation en un carburant distribué à une chambre de moteur à combustion pendant un redémarrage de moteur. Un dispositif de commande pour le système d'alimentation en carburant détermine, au démarrage du moteur, si la vitesse de moteur effective est supérieure ou égale à une vitesse cible à l'aide d'un dispositif de détection de vitesse de moteur (étape S5). Quand il est déterminé que la vitesse de moteur effective est inférieure à la vitesse cible (le résultat de la détermination de l'étape S5 est non), le dispositif de commande augmente la pression d'alimentation du carburant sous pression élevée, devant être fourni à un dispositif d'injection de carburant, en augmentant la pression de distribution du carburant qui est distribué à une pompe haute pression par la commande du fonctionnement d'une vanne d'alimentation en carburant (étape S6).
PCT/JP2014/053756 2014-02-18 2014-02-18 Système d'alimentation en carburant WO2015125208A1 (fr)

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PCT/JP2014/053756 WO2015125208A1 (fr) 2014-02-18 2014-02-18 Système d'alimentation en carburant

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002089344A (ja) * 2000-09-07 2002-03-27 Nippon Soken Inc 燃料噴射装置の経時変化判定装置
JP2003278620A (ja) * 2002-01-21 2003-10-02 Denso Corp 蓄圧式燃料噴射装置
JP2006183469A (ja) * 2004-12-24 2006-07-13 Denso Corp 燃料噴射装置
JP2006342685A (ja) * 2005-06-07 2006-12-21 Toyota Motor Corp 内燃機関の制御装置
JP2009008057A (ja) * 2007-06-29 2009-01-15 Denso Corp 車両の内燃機関用燃料噴射装置
JP2013096335A (ja) * 2011-11-02 2013-05-20 Bosch Corp デポジット検出方法及びコモンレール式燃料噴射制御装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002089344A (ja) * 2000-09-07 2002-03-27 Nippon Soken Inc 燃料噴射装置の経時変化判定装置
JP2003278620A (ja) * 2002-01-21 2003-10-02 Denso Corp 蓄圧式燃料噴射装置
JP2006183469A (ja) * 2004-12-24 2006-07-13 Denso Corp 燃料噴射装置
JP2006342685A (ja) * 2005-06-07 2006-12-21 Toyota Motor Corp 内燃機関の制御装置
JP2009008057A (ja) * 2007-06-29 2009-01-15 Denso Corp 車両の内燃機関用燃料噴射装置
JP2013096335A (ja) * 2011-11-02 2013-05-20 Bosch Corp デポジット検出方法及びコモンレール式燃料噴射制御装置

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