WO2013051123A1 - 内燃機関の制御装置 - Google Patents
内燃機関の制御装置 Download PDFInfo
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- WO2013051123A1 WO2013051123A1 PCT/JP2011/073044 JP2011073044W WO2013051123A1 WO 2013051123 A1 WO2013051123 A1 WO 2013051123A1 JP 2011073044 W JP2011073044 W JP 2011073044W WO 2013051123 A1 WO2013051123 A1 WO 2013051123A1
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- WIPO (PCT)
- Prior art keywords
- fuel
- return valve
- internal combustion
- combustion engine
- pressure fuel
- Prior art date
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Classifications
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- 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
- F02M63/0235—Means for varying pressure in common rails by bleeding fuel pressure
- F02M63/0245—Means for varying pressure in common rails by bleeding fuel pressure between the high pressure pump and the common rail
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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
- F02D41/0002—Controlling intake air
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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
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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
- F02D41/3863—Controlling the fuel pressure by controlling the flow out of the common rail, e.g. using pressure relief valves
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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
- F02D41/22—Safety or indicating devices for abnormal conditions
- F02D2041/224—Diagnosis of the fuel system
- F02D2041/226—Fail safe control for fuel injection pump
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Definitions
- the present invention relates to a control device for an internal combustion engine comprising a high-pressure fuel pump that pressurizes and discharges fuel, and a return valve that can discharge the fuel and its vapor from the high-pressure fuel pump.
- fuel is supplied by storing fuel that is pressurized and discharged by a high-pressure fuel pump in a delivery pipe and distributing the fuel from the delivery pipe to the injectors of each cylinder.
- a high-pressure fuel pump may have a reduced fuel discharge capacity due to an increase in the amount of fuel leakage due to deterioration over time.
- the fuel discharge capacity of the high-pressure fuel pump decreases, the fuel supply amount becomes insufficient during full load operation or the like when the required fuel supply amount is the largest.
- the air-fuel ratio of the air-fuel mixture burned in the internal combustion engine becomes lean, and misfire, engine stall, excessive temperature rise of the catalyst, and the like may occur.
- Patent Document 1 when it is confirmed that the fuel discharge capacity of the high-pressure fuel pump has decreased due to deterioration over time, the throttle valve opening of the internal combustion engine, that is, the throttle opening is limited. Therefore, a technique for avoiding a shortage of fuel supply has been proposed.
- the fuel supply amount is adjusted in accordance with the intake air amount so that the air-fuel ratio of the air-fuel mixture introduced into the combustion chamber becomes a target value. Therefore, if the throttle opening is limited and the intake air amount is reduced, the fuel supply amount necessary to ensure an appropriate air-fuel ratio will be reduced, and even if the fuel discharge capacity of the high-pressure fuel pump is reduced. The air-fuel ratio can be prevented from becoming lean.
- some high-pressure fuel pumps include a return valve for discharging fuel and its vapor from the high-pressure fuel pump.
- a return valve for discharging fuel and its vapor from the high-pressure fuel pump.
- the vapor can be discharged from the high-pressure fuel pump by operating the return valve when the inside of the high-pressure fuel pump is filled with fuel vapor.
- the return valve may operate even when fuel discharge exceeding the fuel discharge capacity of the pump is required.
- the fuel discharge amount of the high-pressure fuel pump is reduced by the amount of fuel discharged thereby.
- the shortage of the fuel supply amount of the internal combustion engine further increases. Therefore, if the return valve is operated, the fuel supply amount may be insufficient even if the required fuel supply amount of the internal combustion engine is reduced by limiting the throttle opening.
- An object of the present invention is to provide a control device for an internal combustion engine that can suitably suppress a shortage of fuel supply to the internal combustion engine due to a shortage of fuel discharge from a high-pressure fuel pump.
- a control device is applied to an internal combustion engine including a high-pressure fuel pump that pressurizes and discharges fuel, and a return valve that can discharge the fuel and its vapor from the high-pressure fuel pump. .
- the control device limits the operation of the return valve when the high-pressure fuel pump is required to discharge fuel exceeding its own fuel discharge capacity.
- the operation of the return valve is restricted, and the fuel and its vapor are discharged from the high pressure fuel pump. Is reduced or prohibited. For this reason, when the fuel discharge amount of the high-pressure fuel pump is less than the requirement, a decrease in the fuel discharge amount due to the operation of the return valve can be suppressed. Therefore, the shortage of the fuel supply amount of the internal combustion engine due to the shortage of the fuel discharge amount of the high pressure fuel pump can be suitably suppressed.
- the shortage of fuel supply to the internal combustion engine due to the shortage of the fuel discharge amount of the high pressure fuel pump can be avoided by limiting the opening of the throttle valve (throttle opening) of the internal combustion engine. Even when the throttle opening is restricted, if the return valve operates, the fuel discharge amount of the high-pressure fuel pump decreases. Therefore, even if the required fuel supply amount of the internal combustion engine is reduced due to the restriction of the throttle opening, the internal combustion engine The engine fuel supply may be insufficient. Therefore, even when the throttle opening is limited, the shortage of the fuel supply amount of the internal combustion engine due to the shortage of the fuel discharge amount of the high-pressure fuel pump is suitably suppressed by restricting the operation of the return valve at the time of the restriction. can do.
- another control device includes a high-pressure fuel pump that pressurizes and discharges fuel, and a return valve that can discharge the fuel and its vapor from the high-pressure fuel pump.
- a high-pressure fuel pump that pressurizes and discharges fuel
- a return valve that can discharge the fuel and its vapor from the high-pressure fuel pump.
- the throttle opening is limited to limit the internal combustion engine.
- the required fuel supply is reduced.
- the throttle opening is limited, if the return valve operates, the fuel discharge amount of the high-pressure fuel pump decreases. Therefore, even if the required fuel supply amount of the internal combustion engine is reduced due to the throttle opening limitation, the fuel supply amount May be insufficient.
- the operation of the return valve is limited, and the decrease in the fuel discharge amount of the high-pressure fuel pump due to the operation is suppressed. Therefore, the shortage of the fuel supply amount of the internal combustion engine due to the shortage of the fuel discharge amount of the high pressure fuel pump can be suitably suppressed.
- the restriction of the return valve operation is, for example, prohibiting the return valve operation, reducing the amount of fuel and its vapor discharged from the high-pressure fuel pump when the return valve is operated, and making the return valve difficult to operate. Changing the operating condition of the return valve as described above.
- FIG. 1 is a schematic diagram schematically showing a configuration of a high-pressure fuel system of an internal combustion engine to which a first embodiment of the present invention is applied.
- the flowchart of the return valve operation control routine applied to the same embodiment.
- the flowchart of the return valve operation control routine applied to the 2nd Embodiment of this invention.
- a feed pump 2 that pumps up fuel in the tank 1 is installed in the fuel tank 1.
- the feed pump 2 is connected to the high-pressure fuel pump 4 through the feed passage 3.
- the feed passage 3 is provided with a pulsation damper 5 that suppresses the pulsation of the fuel pressure therein.
- the feed passage 3 is connected to a relief passage 6 for returning fuel from the inside to the fuel tank 1.
- the relief passage 6 is provided with a check valve 7 that opens when the fuel pressure in the feed passage 3 exceeds a certain value.
- the high pressure fuel pump 4 is provided with a pressurizing chamber 8 into which the fuel sent from the feed pump 2 through the feed passage 3 is introduced.
- the high-pressure fuel pump 4 is provided with an electromagnetic spill valve 9 that opens and closes the pressurizing chamber 8 with respect to the feed passage 3.
- the high-pressure fuel pump 4 is provided with a plunger 10 that presses the fuel in the pressurizing chamber 8.
- the plunger 10 is reciprocated in the vertical direction by a cam 11 provided on the camshaft of the internal combustion engine, and presses the fuel in the pressurizing chamber 8 in accordance with the rise.
- the pressurizing chamber 8 of the high-pressure fuel pump 4 is connected to the high-pressure fuel pipe 13 via a check valve 12 that opens when the fuel pressure inside the high-pressure fuel pump 4 exceeds a certain value.
- the high-pressure fuel pipe 13 connects the pressurizing chamber 8 to a delivery pipe 14 that stores fuel sent from the high-pressure fuel pump 4.
- the delivery pipe 14 is connected to an injector 15 for each cylinder of the internal combustion engine.
- the high-pressure fuel pump 4 is provided with an electromagnetically driven return valve 16.
- the return valve 16 is activated by the input of the operation signal, and discharges the fuel in the pressurizing chamber 8 and its vapor.
- the fuel and vapor discharged from the pressurizing chamber 8 by the operation of the return valve 16 are sent to the fuel tank 1 through the return passage 17.
- the high-pressure fuel system high-pressure fuel pump 4 configured as described above is controlled by an electronic control unit 18 that governs overall control of the internal combustion engine.
- the electronic control unit 18 is connected to various sensors that detect the operating status of the internal combustion engine. Examples of such sensors include a water temperature sensor 19 that detects the temperature of the cooling water (cooling water temperature) of the internal combustion engine, an intake air temperature sensor 20 that detects the temperature of intake air (intake air temperature) of the internal combustion engine, and the intake air amount of the internal combustion engine.
- the electronic control unit 18 controls the fuel injection amount of the injector 15, the opening degree of the throttle valve 23 (throttle opening degree), and the fuel discharge amount of the high-pressure fuel pump 4 based on the detection results of these sensors. To implement.
- the electronic control unit 18 calculates the fuel injection amount of the injector 15 based on the intake air amount detected by the air flow meter 21. Calculation of the fuel injection amount at this time is performed by applying various corrections according to the situation to a value obtained by dividing the intake air amount by the target value of the air-fuel ratio. For example, when the ignition timing of the internal combustion engine is significantly retarded, an increase correction of the fuel injection amount is performed in order to reduce the exhaust gas temperature in order to suppress the excessive temperature rise of the catalyst. Then, the electronic control unit 18 controls the injector 15 of each cylinder so that fuel injection corresponding to the calculated fuel injection amount is performed.
- the fuel discharge amount of the high-pressure fuel pump 4 can be adjusted by changing the valve closing timing of the electromagnetic spill valve 9 during the ascending period of the plunger 10. That is, if the closing timing of the electromagnetic spill valve 9 is advanced, the fuel discharge amount of the high-pressure fuel pump 4 increases, and if the closing timing is delayed, the fuel discharge amount of the high-pressure fuel pump 4 decreases. Therefore, the electronic control unit 18 closes the closing timing of the electromagnetic spill valve 9 necessary for securing the fuel discharge amount sufficient to enable fuel injection corresponding to the fuel injection amount from the calculation result of the fuel injection amount of the injector 15 described above. Is calculated to control the fuel discharge amount of the high-pressure fuel pump 4.
- the electronic control unit 18 calculates the throttle opening necessary for obtaining the engine output according to the driver's request based on the accelerator operation amount detected by the accelerator position sensor 22.
- the throttle opening is increased, the intake air amount increases and the fuel injection amount increases. Further, the amount of fuel that can be discharged from the high-pressure fuel pump 4 is limited. Therefore, when the throttle opening is increased to a certain degree or more, the fuel discharge capacity of the high-pressure fuel pump 4 cannot supply a necessary amount of fuel to the injector 15. Therefore, an upper limit value ⁇ is set for the throttle opening actually set.
- the throttle opening is limited so as to be equal to or lower than the upper limit value ⁇ .
- the fuel discharge capacity of the high-pressure fuel pump 4 may decrease due to an increase in the amount of fuel leakage from the pressurizing chamber 8 or the like due to deterioration over time.
- the upper limit value ⁇ of the throttle opening is set so as not to cause a shortage of fuel supply to the internal combustion engine even when the fuel discharge capacity of the high-pressure fuel pump 4 decreases due to deterioration over time.
- the electronic control unit 18 sets the upper limit value ⁇ of the throttle opening to a value smaller than normal when the calculated fuel injection amount is larger than a certain level. We try to prevent shortages.
- the electronic control unit 18 operates the return valve 16 when the high pressure fuel pump 4 is at a high temperature, and discharges the vapor in the high pressure fuel pump 4. Details of the operation control of the return valve 16 will be described below.
- the operation control of the return valve 16 is performed through the processing of the return valve operation control routine shown in FIG.
- the processing of this routine is repeatedly executed by the electronic control unit 18 every predetermined control cycle.
- the execution of the routine by the electronic control unit 18 is performed not only while the internal combustion engine is operating, but also when the internal combustion engine is stopped.
- step S100 When the processing of this routine is started, it is first confirmed in step S100 whether or not the throttle opening is restricted. That is, in this step S100, whether or not the throttle opening actually set is limited so that the throttle opening calculated from the accelerator operation amount exceeds the upper limit ⁇ and is equal to or lower than the upper limit ⁇ . Is confirmed.
- step S101 it is confirmed whether the operating condition of the return valve 16 is satisfied.
- the operating condition of the return valve 16 is established when either the high pressure fuel pump 4 is hot during startup of the internal combustion engine or when the high pressure fuel pump 4 is hot while the internal combustion engine is stopped. .
- the temperature of the high-pressure fuel pump 4 during startup of the internal combustion engine is estimated from the cooling water temperature, intake air temperature, lubricating oil temperature of the internal combustion engine, and the like.
- the temperature of the high-pressure fuel pump 4 when the internal combustion engine is stopped is estimated from the coolant temperature at that time, the temperature of the lubricating oil of the internal combustion engine, the intake air temperature when the internal combustion engine is stopped, and the like.
- step S101: NO the operating condition of the return valve 16 is not satisfied
- S101: YES the operating condition of the return valve 16 is satisfied
- the electronic control unit 18 limits the throttle opening so as to be equal to or less than the upper limit value ⁇ in order to avoid insufficient fuel supply.
- the electronic control unit 18 When the throttle opening is not limited, when the operating condition of the return valve 16 is established due to the high temperature of the high pressure fuel pump 4, the electronic control unit 18 operates the return valve 16 to increase the pressure of the high pressure fuel. Vapor generated in the pump 4 is discharged.
- the electronic control unit 18 prohibits the operation of the return valve 16 regardless of whether the operation condition of the return valve 16 is satisfied. Therefore, when the throttle opening is limited, the fuel discharge amount of the high-pressure fuel pump 4 is not reduced by the operation of the return valve 16, and the fuel supply shortage of the internal combustion engine due to the reduction of the fuel discharge amount is also caused. It will not occur.
- the operation of the return valve 16 when the throttle opening is restricted, the operation of the return valve 16 is prohibited so that the fuel supply of the internal combustion engine is insufficient due to the insufficient fuel discharge amount of the high-pressure fuel pump 4. It was suppressed.
- the high-pressure fuel pump 4 associated with the operation of the return valve 16 is reduced. It is possible to suppress a decrease in the fuel discharge amount.
- the amount of fuel and vapor discharged from the high-pressure fuel pump 4 when the return valve 16 is operated is reduced, thereby reducing the fuel discharge amount of the high-pressure fuel pump 4.
- the shortage of fuel supply to the internal combustion engine due to the shortage is suppressed.
- the operation control of the return valve 16 in this embodiment is performed through the processing of the return valve operation control routine shown in FIG.
- the processing of this routine is repeatedly executed by the electronic control unit 18 every predetermined control cycle.
- the execution of the routine by the electronic control unit 18 is performed not only while the internal combustion engine is operating, but also when the internal combustion engine is stopped.
- step S200 it is confirmed whether or not the operating condition of the return valve 16 is satisfied.
- the operating conditions of the return valve 16 are the same as those in the first embodiment.
- S200: NO the operating condition of the return valve 16 is not established (S200: NO)
- the process of this routine is terminated as it is.
- step S200 if the operating condition of the return valve 16 is established (S200: YES), the process proceeds to step S201, and in step S201, it is confirmed whether or not the throttle opening is limited.
- step S202 If the throttle opening is not limited (S201: NO), the process proceeds to step S202. After the return valve 16 is activated in step S202, the process of this routine is terminated. The The operation of the return valve 16 at this time is continued while the operating condition is satisfied.
- step S203 the return valve 16 is operated with the operating time limited. Thereafter, the processing of this routine is terminated. The operation of the return valve 16 at this time is terminated when a preset operation time has elapsed even if the operation condition continues.
- the electronic control unit 18 when the throttle opening is not limited, operates the return valve 16 according to the establishment of the operating condition, and the vapor generated in the high-pressure fuel pump 4 due to high temperature. Is discharged. The operation of the return valve 16 at this time is continued until the operating condition is not satisfied.
- the electronic control unit 18 operates the return valve 16 according to the establishment of the operating condition even when the throttle opening degree is limited.
- the operation of the return valve 16 at this time has a limited operation time, and even when the operation condition continues to be established, the operation is stopped when a certain time elapses. Therefore, the amount of fuel discharged from the high-pressure fuel pump 4 and the amount of vapor discharged by the operation of the return valve 16 at this time is smaller than that when the throttle opening restriction is not performed, and the high-pressure fuel pump 4 by the operation of the return valve 16 is reduced. The decrease in the fuel discharge amount is limited.
- the operation control of the return valve 16 in this embodiment is performed through the processing of the return valve operation control routine shown in FIG.
- the processing of this routine is repeatedly executed by the electronic control unit 18 every predetermined control cycle.
- the execution of the routine by the electronic control unit 18 is performed not only while the internal combustion engine is operating, but also when the internal combustion engine is stopped.
- step S300 it is confirmed whether or not the throttle opening is restricted.
- step S301 whether the estimated temperature of the high-pressure fuel pump 4 is equal to or higher than the determination value ⁇ . Is confirmed.
- the estimated temperature of the high-pressure fuel pump 4 is obtained based on the cooling water temperature, the intake air temperature, the temperature of the lubricating oil of the internal combustion engine, and the like. If the estimated temperature of the high-pressure fuel pump 4 is equal to or higher than the determination value ⁇ (S301: YES), the process proceeds to step S302. After the return valve 16 is activated in step S302, the process of this routine is performed. Is terminated.
- the return valve 16 is not actuated and the processing of this routine is terminated as it is.
- the operating condition of the return valve 16 when the throttle opening is not limited is that the estimated temperature of the high-pressure fuel pump 4 is equal to or higher than the determination value ⁇ .
- step S303 it is determined whether or not the estimated temperature of the high-pressure fuel pump 4 is equal to or higher than the determination value ⁇ . It is confirmed.
- the determination value ⁇ is set to a value larger than the above-described determination value ⁇ . If the estimated temperature of the high-pressure fuel pump 4 is equal to or higher than the determination value ⁇ (S303: YES), the process proceeds to step S302. After the return valve 16 is activated in step S302, the process of this routine is performed. Is terminated.
- the return valve 16 is not actuated and the processing of this routine is terminated as it is.
- the operating condition of the return valve 16 when the throttle opening is limited is that the estimated temperature of the high-pressure fuel pump 4 is equal to or higher than the determination value ⁇ .
- the electronic control unit 18 when the throttle opening is not limited, the electronic control unit 18 operates the return valve 16 on the condition that the estimated temperature of the high-pressure fuel pump 4 is equal to or higher than the determination value ⁇ .
- the electronic control unit 18 uses the return valve as an operating condition that the estimated temperature of the high-pressure fuel pump 4 is equal to or higher than a determination value ⁇ greater than the determination value ⁇ . 16 is activated. Therefore, when the throttle opening is limited, the return valve 16 is not operated unless the high-pressure fuel pump 4 has a higher temperature. That is, in the present embodiment, the operating condition of the return valve 16 is changed according to whether or not the throttle opening restriction is performed so that the return valve 16 is less likely to be operated when the throttle opening restriction is performed. .
- the return valve 16 when the throttle opening is limited, the return valve 16 is operated less frequently, and the frequency of the fuel discharge amount of the high-pressure fuel pump 4 is reduced due to the operation. . Therefore, the shortage of fuel supply to the internal combustion engine due to the shortage of the fuel discharge amount of the high-pressure fuel pump 4 occurs only at a low frequency.
- the amount of fuel and vapor discharged from the high-pressure fuel pump 4 when the return valve 16 is operated is reduced by limiting the operation time of the return valve 16.
- the amount of fuel and vapor discharged from the high-pressure fuel pump 4 can be reduced in a mode other than the limitation of the operation time of the return valve 16.
- the fuel and vapor can be discharged from the high-pressure fuel pump 4 when the return valve 16 is operated by intermittently operating the return valve 16 or reducing the opening of the return valve 16 so that the opening can be adjusted. The amount can be reduced.
- the operating condition of the return valve 16 is defined by the estimated temperature of the high-pressure fuel pump 4.
- the estimated temperature of the high-pressure fuel pump 4 at which the operation of the return valve 16 is permitted is made higher than when the throttle opening is not limited.
- the operation frequency of the return valve 16 at the time of restriction was reduced. Even when a different operating condition is set, the operating condition of the return valve 16 is set according to whether or not the throttle opening restriction is performed so that the return valve 16 is more difficult to operate when the throttle opening is limited. If changed, it is possible to reduce the operating frequency of the return valve 16 when the throttle opening is limited.
- the operating conditions of the return valve 16 in the first and second embodiments may be changed as appropriate.
- the return valve 16 if the return valve 16 is operated when vapor is generated in the high-pressure fuel pump 4, the vapor can be discharged from the high-pressure fuel pump 4 to maintain the operation of the high-pressure fuel pump 4 properly. it can.
- the operation of the return valve 16 is prohibited or the amount of fuel and vapor discharged during the operation of the throttle valve is restricted when the throttle opening is restricted, the internal combustion engine can be caused by a shortage of fuel discharge from the high-pressure fuel pump 4. It is possible to suitably suppress the fuel supply shortage.
- the upper limit value of the throttle opening is made variable according to the fuel injection amount, but the upper limit value may be fixed. Even in this case, if the upper limit value is set appropriately, the required fuel supply amount of the internal combustion engine can be reduced so that the shortage of fuel supply to the internal combustion engine does not occur.
- the upper limit value of the throttle opening is always set, but only when there is a concern that the required fuel injection amount of the internal combustion engine is large and the fuel discharge amount of the high-pressure fuel pump 4 is insufficient.
- An upper limit value of the opening degree may be set. Even in such a case, when the high-pressure fuel pump 4 is required to discharge fuel exceeding the fuel discharge capacity, the required fuel supply amount of the internal combustion engine can be reduced and the shortage of the fuel supply amount can be reduced.
- the throttle opening is limited when the high-pressure fuel pump 4 is required to discharge fuel exceeding the fuel discharge capacity.
- Such restriction of the throttle opening can also be performed in a mode other than the setting of the upper limit value. For example, when the required fuel injection amount of the internal combustion engine is larger than a certain level, the required fuel supply amount of the internal combustion engine can also be reduced and the shortage of fuel supply can be reduced by reducing the throttle opening by a certain amount. .
- the throttle opening is limited when the high-pressure fuel pump 4 is required to discharge fuel exceeding the fuel discharge capacity.
- the throttle opening is not limited. May be. Even in such a case, if the operation of the return valve 16 is limited when the high-pressure fuel pump 4 is required to discharge fuel exceeding the fuel discharge capacity, the fuel discharge amount of the high-pressure fuel pump 4 accompanying the operation of the return valve 16 It is possible to suppress an increase in the shortage of the fuel supply amount of the internal combustion engine due to the decrease in the engine.
- the control device for an internal combustion engine of the present invention can be applied to an internal combustion engine having a high-pressure fuel system having a configuration different from that shown in FIG. 1 in the same manner as in the above embodiment.
- the control device of the present invention can be applied to any internal combustion engine that includes a high-pressure fuel pump that pressurizes and discharges fuel and a return valve that can discharge fuel and its vapor from the high-pressure fuel pump. is there.
- the application can suppress suitably the fuel supply shortage of an internal combustion engine by the shortage of the fuel discharge amount of a high pressure fuel pump.
- SYMBOLS 1 Fuel tank, 2 ... Feed pump, 3 ... Feed passage, 4 ... High pressure fuel pump, 5 ... Pulsation damper, 6 ... Relief passage, 7 ... Check valve, 8 ... Pressurization chamber, 9 ... Electromagnetic spill valve, 10 ... Plunger, 11 ... Cam, 12 ... Check valve, 13 ... High pressure fuel pipe, 14 ... Delivery pipe, 15 ... Injector, 16 ... Return valve, 17 ... Return passage, 18 ... Electronic control unit, 19 ... Water temperature sensor, 20 ... intake air temperature sensor, 21 ... air flow meter, 22 ... accelerator position sensor, 23 ... throttle valve.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
Abstract
Description
以下、本発明の内燃機関の制御装置を具体化した第1の実施の形態を、図1及び図2を参照して詳細に説明する。
次に、本発明の内燃機関の制御装置を具体化した第2の実施の形態を、図3を参照して詳細に説明する。なお、本実施の形態及び下記の第3の実施の形態において、上述した実施の形態のものと同様の部材については、共通の符号を付してその詳細な説明を省略する。
次に、本発明の内燃機関の制御装置を具体化した第3の実施の形態を、図4を参照して詳細に説明する。
Claims (6)
- 燃料を加圧して吐出する高圧燃料ポンプと、その高圧燃料ポンプから燃料及びそのベーパーを排出可能なリターンバルブと、を備える内燃機関の制御装置において、
前記高圧燃料ポンプが自身の燃料吐出能力以上の燃料吐出を要求されているときに、前記リターンバルブの作動を制限する
ことを特徴とする内燃機関の制御装置。 - 前記高圧燃料ポンプが自身の燃料吐出能力以上の燃料吐出を要求されているときに、内燃機関のスロットルバルブの開度を制限する
請求項1に記載の内燃機関の制御装置。 - 燃料を加圧して吐出する高圧燃料ポンプと、その高圧燃料ポンプから燃料及びそのベーパーを排出可能なリターンバルブと、を備える内燃機関の制御装置であって、内燃機関の要求燃料供給量が大きいときに、内燃機関のスロットルバルブの開度を制限する制御装置において、
前記スロットルバルブの開度が制限されているときに、前記リターンバルブの作動を制限する
ことを特徴とする内燃機関の制御装置。 - 前記リターンバルブの作動の制限は、同リターンバルブの作動を禁止することを含む
請求項1~3のいずれか1項に記載の内燃機関の制御装置。 - 前記リターンバルブの作動の制限は、同リターンバルブの作動時に前記高圧燃料ポンプから排出される燃料及びそのベーパーの量を少なくすることを含む
請求項1~3のいずれか1項に記載の内燃機関の制御装置。 - 前記リターンバルブの作動の制限は、同リターンバルブが作動され難くなるように同リターンバルブの作動条件を変更することを含む
請求項1~3のいずれか1項に記載の内燃機関の制御装置。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14/343,596 US9745937B2 (en) | 2011-10-06 | 2011-10-06 | Control device for internal combustion engine |
PCT/JP2011/073044 WO2013051123A1 (ja) | 2011-10-06 | 2011-10-06 | 内燃機関の制御装置 |
DE112011105711.3T DE112011105711B4 (de) | 2011-10-06 | 2011-10-06 | Steuervorrichtung für Maschine mit interner Verbrennung |
JP2013537325A JP5971255B2 (ja) | 2011-10-06 | 2011-10-06 | 内燃機関の制御装置 |
CN201180073960.5A CN103857900B (zh) | 2011-10-06 | 2011-10-06 | 内燃机的控制装置 |
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PCT/JP2011/073044 WO2013051123A1 (ja) | 2011-10-06 | 2011-10-06 | 内燃機関の制御装置 |
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WO2013051123A1 true WO2013051123A1 (ja) | 2013-04-11 |
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PCT/JP2011/073044 WO2013051123A1 (ja) | 2011-10-06 | 2011-10-06 | 内燃機関の制御装置 |
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US (1) | US9745937B2 (ja) |
JP (1) | JP5971255B2 (ja) |
CN (1) | CN103857900B (ja) |
DE (1) | DE112011105711B4 (ja) |
WO (1) | WO2013051123A1 (ja) |
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US9429097B2 (en) * | 2014-12-04 | 2016-08-30 | Ford Global Technologies, Llc | Direct injection pump control |
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2011
- 2011-10-06 CN CN201180073960.5A patent/CN103857900B/zh not_active Expired - Fee Related
- 2011-10-06 DE DE112011105711.3T patent/DE112011105711B4/de not_active Expired - Fee Related
- 2011-10-06 JP JP2013537325A patent/JP5971255B2/ja not_active Expired - Fee Related
- 2011-10-06 US US14/343,596 patent/US9745937B2/en active Active
- 2011-10-06 WO PCT/JP2011/073044 patent/WO2013051123A1/ja active Application Filing
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Also Published As
Publication number | Publication date |
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JP5971255B2 (ja) | 2016-08-17 |
US9745937B2 (en) | 2017-08-29 |
CN103857900A (zh) | 2014-06-11 |
JPWO2013051123A1 (ja) | 2015-03-30 |
DE112011105711B4 (de) | 2019-05-23 |
US20140209064A1 (en) | 2014-07-31 |
DE112011105711T5 (de) | 2014-07-03 |
CN103857900B (zh) | 2017-09-08 |
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