WO2023199612A1 - 高圧燃料ポンプの制御装置 - Google Patents
高圧燃料ポンプの制御装置 Download PDFInfo
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- WO2023199612A1 WO2023199612A1 PCT/JP2023/006423 JP2023006423W WO2023199612A1 WO 2023199612 A1 WO2023199612 A1 WO 2023199612A1 JP 2023006423 W JP2023006423 W JP 2023006423W WO 2023199612 A1 WO2023199612 A1 WO 2023199612A1
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- pressure
- fuel
- current
- current application
- plunger
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- 239000000446 fuel Substances 0.000 title claims abstract description 222
- 238000011156 evaluation Methods 0.000 claims abstract description 14
- 230000000630 rising effect Effects 0.000 claims abstract description 7
- 238000002485 combustion reaction Methods 0.000 claims description 37
- 238000007599 discharging Methods 0.000 claims 1
- 238000000034 method Methods 0.000 description 30
- 238000010586 diagram Methods 0.000 description 27
- 230000010349 pulsation Effects 0.000 description 14
- 230000007423 decrease Effects 0.000 description 8
- 238000012545 processing Methods 0.000 description 7
- 238000009530 blood pressure measurement Methods 0.000 description 5
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000003247 decreasing effect Effects 0.000 description 3
- 230000001360 synchronised effect Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000002828 fuel tank Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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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
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/20—Output circuits, e.g. for controlling currents in command coils
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/3809—Common rail control systems
- F02D41/3836—Controlling the fuel pressure
- F02D41/3845—Controlling the fuel pressure by controlling the flow into the common rail, e.g. the amount of fuel pumped
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/20—Varying fuel delivery in quantity or timing
- F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
- F02M59/366—Valves being actuated electrically
- F02M59/368—Pump inlet valves being closed when actuated
-
- 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
- F02M63/024—Means for varying pressure in common rails by bleeding fuel pressure between the low pressure pump and the high pressure pump
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/20—Output circuits, e.g. for controlling currents in command coils
- F02D2041/202—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit
- F02D2041/2024—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit the control switching a load after time-on and time-off pulses
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/06—Fuel or fuel supply system parameters
- F02D2200/0602—Fuel pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2250/00—Engine control related to specific problems or objectives
- F02D2250/04—Fuel pressure pulsation in common rails
Definitions
- the present invention relates to a control device for a high-pressure fuel pump.
- Automobile internal combustion engines are required to have high efficiency, low emissions, and high output. Direct-injection internal combustion engines have been popular for a long time as a means to solve these problems in a well-balanced manner. Automobile manufacturers and suppliers have been making constant efforts to improve the value of their products, and one of the important issues is making high-pressure fuel pumps quieter.
- Patent Document 1 In conventional high-pressure fuel pump noise reduction control, control was performed as in Patent Document 1 in order to check the minimum amount of current application for each high-pressure fuel pump within a range that does not cause failure in fuel discharge.
- the technique disclosed in Patent Document 1 achieves quietness by reducing the current (second current).
- the current is reduced too much, the valve closing operation will be insufficient, so when the actual fuel pressure in the pressure accumulator container falls below the target fuel pressure by a predetermined value or more, the current is increased to eliminate the insufficient valve closing operation.
- the discharge amount of the high-pressure fuel pump is controlled so that the fuel pressure follows the target value.
- the discharge amount is controlled by controlling the start time of the current applied to the solenoid. Therefore, in a high-pressure fuel pump compatible with noise reduction control, two types of control are performed in parallel: discharge amount control based on current start timing and noise reduction control based on current value.
- the problem here is that two controls are performed by comparing the measured value of the fuel pressure and the target fuel pressure, and that the two controls interfere.
- Patent Document 1 when the measured value of the fuel pressure becomes lower than the target fuel pressure, it is determined that the valve closing operation is insufficient, and the second current value is increased.
- the discharge amount control when the measured value of the fuel pressure becomes lower than the target fuel pressure, the current application start timing is advanced in order to increase the discharge amount. Two values are controlled without determining whether the cause of the measured value of the fuel pressure being lower than the target fuel pressure is the current value or the timing of starting the current application.
- the current application start timing becomes early even though the current application start timing can realize a sufficient ejection amount. This early start timing of current application causes unnecessary fuel pressure pulsations.
- An object of the present invention is to provide a high-pressure fuel pump control device that avoids fuel pressure pulsation due to interference between two controls: discharge amount control based on current start timing and noise reduction control based on current value.
- a high-pressure fuel pump control device is arranged between both pipes to pressurize and discharge fuel in the low-pressure pipe to the high-pressure pipe, and arranged between the low-pressure pipe and the pressurizing chamber.
- a control device for controlling a high-pressure fuel pump including at least an intake valve, a solenoid for controlling opening and closing of the intake valve, and a plunger for compressing fuel in the pressurizing chamber, the high-pressure piping having a fuel pressure sensor.
- a plunger phase measuring section for measuring a phase angle of the plunger is provided near the plunger, a plunger operation determining section for determining that the plunger is rising based on the phase angle of the plunger; a fuel pressure increase evaluation section that evaluates the increase in fuel pressure during the period in which the plunger is determined to be rising by the plunger operation determination section; and a determination of success or failure in closing the intake valve based on the evaluation result of the fuel pressure increase evaluation section.
- a discharge amount control section that controls the amount of fuel discharged by controlling the timing to start applying current to the solenoid based on the fuel pressure measured by the fuel pressure sensor and the target fuel pressure. The discharge amount control section determines a control gain for the current application start timing based on the determination result of the valve closing determination section.
- the present invention it is possible to provide a high-pressure fuel pump control device that avoids fuel pressure pulsation due to interference between two controls: discharge amount control based on current start timing and noise reduction control based on current value.
- FIG. 1 is a schematic configuration diagram showing an internal combustion engine according to a first embodiment.
- FIG. 2 is a schematic configuration diagram showing the high-pressure fuel pump according to the first embodiment.
- FIG. 3 is a time chart showing the operation of the high-pressure fuel pump according to the first embodiment.
- FIG. 4 is a block diagram showing the high-pressure fuel pump according to the first embodiment.
- FIG. 5A is an explanatory diagram showing the operation of the valve body when the valve closes successfully according to the first embodiment.
- FIG. 5B is an explanatory diagram showing the operation of the valve body when the valve fails to close according to the first embodiment.
- FIG. 6 is a conceptual diagram showing a method of identifying success or failure of valve closing from the increase in fuel pressure in synchronization with the rise of the plunger according to the first embodiment.
- FIG. 1 is a schematic configuration diagram showing an internal combustion engine according to a first embodiment.
- FIG. 2 is a schematic configuration diagram showing the high-pressure fuel pump according to the first embodiment.
- FIG. 3
- FIG. 7 is an explanatory diagram showing changes in fuel pressure when the present invention is not applied.
- FIG. 8 is a block diagram showing the high-pressure fuel pump and each control section of the ECU according to the first embodiment.
- FIG. 9 is a flowchart showing the noise reduction control (current application amount control) executed every 2 ms according to the first embodiment.
- FIG. 10 is a flowchart showing ejection amount control executed every 10 ms according to the first embodiment.
- FIG. 11 is an explanatory diagram showing how pressure pulsation is reduced according to the first embodiment.
- FIG. 12 is a block diagram showing a high-pressure fuel pump according to the second embodiment.
- FIG. 13 is an explanatory diagram showing a map showing the correlation between target fuel pressure and current application timing according to the second embodiment.
- FIG. 14 is a flowchart showing interference reduction control between discharge amount control and noise reduction control (first current application amount control) according to the operating state of the internal combustion engine according to the second embodiment.
- FIG. 15 is a block diagram showing a high-pressure fuel pump according to a fourth embodiment.
- FIG. 16 is an explanatory diagram showing a map for adjusting the correlation between the current application timing and the current application amount stored in the current parameter memory according to the fourth embodiment by learning for each individual.
- FIG. 17 is a flowchart showing interference reduction control between discharge amount control and noise reduction control (first current application amount control) according to the learning state of the internal combustion engine according to the fourth embodiment.
- the valve body is open when no current is applied to the solenoid. Then, when current is applied to the solenoid, the valve body closes, and this valve closing prevents the fuel compressed by the rise of the plunger from returning to the low-pressure piping side, and discharges the fuel to the high-pressure piping side.
- a normally open type pump that operates in this manner will be described. However, this embodiment can also be applied to a normally closed type pump by replacing the closed valve with the opened valve.
- FIG. 1 is a schematic configuration diagram showing an internal combustion engine 100 according to the present embodiment.
- FIG. 1 schematically shows a direct injection internal combustion engine as an internal combustion engine 100.
- fuel stored in a fuel tank 101 is pressurized to about 0.4 MPa by a feed pump 102, and further pressurized to several tens of MPa by a high-pressure fuel pump 103 via a low-pressure pipe 111.
- the pressurized fuel is injected from the direct injector 105 into the cylinder 106 of the internal combustion engine 100 via the high pressure pipe 104 .
- the injected fuel is mixed with the air sucked into the cylinder 106 by the operation of the piston 107.
- This air-fuel mixture is ignited by the spark generated by the spark plug 108 and explodes.
- the heat generated by the explosion causes the air-fuel mixture in cylinder 106 to expand, pushing piston 107 down.
- the force pushing down the piston 107 rotates the crankshaft 110 via the link mechanism 109.
- the rotation of the crankshaft 110 is transmitted to the wheels through the transmission and becomes the force that moves the vehicle.
- Such an internal combustion engine 100 is controlled by an ECU (engine control unit) 112 that is a control device.
- the ECU 112 is a microcontroller that comprehensively controls the operation of the internal combustion engine 100 using electrical auxiliary devices.
- the ECU 112 constitutes a functional unit formed by cooperation of a program and an arithmetic unit.
- ECU 112 is a control device that controls high-pressure fuel pump 103.
- the internal combustion engine 100 is mainly required to have low fuel consumption, high output, and exhaust purification, but is also required to reduce noise and vibration as added value.
- noise is generated due to collision between the valve body or the anchor 204 and the stopper 208 when the suction valve 203 is opened or closed.
- Each automobile manufacturer and supplier is making a lot of effort to reduce noise.
- FIG. 2 is a schematic configuration diagram showing the high-pressure fuel pump 103 according to this embodiment.
- FIG. 2 shows the structure of the high-pressure fuel pump 103.
- the high-pressure fuel pump 103 includes a plunger 202 that moves up and down as a cam 201 attached to the crankshaft 110 of the internal combustion engine 100 rotates. Plunger 202 compresses fuel within pressurizing chamber 211 .
- the high-pressure fuel pump 103 includes an intake valve 203 that opens and closes in synchronization with the vertical movement of the plunger 202.
- the suction valve 203 is disposed between the low-pressure pipe 111 and the pressurizing chamber 211 among both pipes in order to pressurize and discharge the fuel in the low-pressure pipe 111 to the high-pressure pipe 104.
- the high-pressure fuel pump 103 includes a solenoid 205 that controls the opening and closing operations of the intake valve 203.
- the high-pressure fuel pump 103 includes an anchor 204 that is attracted by electromagnetic force generated by a solenoid 205 and controls the operation of the suction valve 203 .
- the high-pressure fuel pump 103 is surrounded by a casing 223 and forms a pressurizing chamber 211 inside. Fuel flows into the pressurizing chamber 211 from the low pressure pipe 111 side through the inlet 225 and the communication port 221. The fuel that has flowed into the pressurizing chamber 211 passes through the outlet 222 and is discharged to the high pressure pipe 104 side. Outlet 222 is opened and closed by discharge valve 210.
- the discharge valve 210 is always biased by a spring portion 226 in a direction to close the outlet port 222, and when the pressure in the pressurized chamber 211 overcomes the spring force of the spring portion 226, the outlet port 222 opens and fuel is injected. be done.
- the operation of the anchor 204 in the axial direction is controlled by controlling the on/off of energization of the solenoid 205.
- the solenoid 205 When the solenoid 205 is de-energized, the anchor 204 is constantly biased in the valve-opening direction by the first spring 209 to maintain the suction valve 203 in the open position.
- Such a high-pressure fuel pump 103 is called a normally open type high-pressure fuel pump, and in this embodiment, the normally open type will be described.
- the high-pressure fuel pump 103 can also be applied to a normally closed type high-pressure fuel pump by replacing the opening and closing valves.
- the solenoid 205 When the solenoid 205 is energized, an electromagnetic attractive force is generated between the fixed part (magnetic core) 206 and the anchor 204. As a result, the anchor 204 provided on the base end side of the suction valve 203 is attracted in the valve opening direction (left direction L in FIG. 2) against the spring force of the first spring 209. When the anchor 204 is attracted to the fixed part 206, the suction valve 203 becomes a check valve that opens and closes based on the differential pressure between the upstream side and the downstream side and the biasing force of the second spring 215. Therefore, as the pressure on the downstream side of the suction valve 203 increases, the suction valve 203 moves in the valve closing direction. When the suction valve 203 moves by the set lift amount in the valve closing direction, it is seated on the seat portion 207, the suction valve 203 is closed, and the fuel in the pressurizing chamber 211 cannot flow back to the low pressure pipe 111 side.
- FIG. 3 is a time chart showing the operation of the high-pressure fuel pump 103 according to this embodiment.
- the suction valve 203 detects the rotation angle of a cam 201 attached to the crankshaft 110 so that it opens and closes in synchronization with the up and down movements of the plunger 202, and detects the rotation angle determined from, for example, Top Dead Center (TDC).
- TDC Top Dead Center
- L and R are the inductance and resistance of the solenoid 205 and wiring, respectively.
- Fmag the magnetic attraction force Fmag by which the fixed part (magnetic core) 206 attracts the anchor 204 also increases.
- the anchor 204 When the magnetic attraction force Fmag becomes larger than the force Fsp of the first spring 209, the anchor 204, which has been held down by the spring force Fsp, starts to move toward the fixed part 206 (timing t2).
- the suction valve 203 also follows the anchor 204 and moves toward the fixed part 206, being pushed by the pressurized fuel due to the rise of the plunger 202.
- timing t3 the current I decreases.
- timing t2 and timing t3 there is a period Th during which the current I is applied at its maximum value.
- the discharge valve 210 opens and the fuel pressurized by the rise of the plunger 202 is discharged to the high-pressure pipe 104. Thereafter, when the drive pulse is turned off at timing t5, a reverse voltage is applied to the solenoid 205, thereby cutting off the holding current supplied to the solenoid 205.
- the anchor 204 moves from the valve-closed position to the valve-open position together with the intake valve 203 (timings t7 to t8).
- the high-pressure fuel pump 103 sends fuel from the low-pressure pipe 111 to the high-pressure pipe 104.
- the anchor 204 collides with the fixed part 206 to complete the valve closing (timing t4 in FIG. 3), and the anchor 204 and the intake valve 203 collide with the stopper 208 to complete the valve opening (timing t8 in FIG. 3).
- noise is generated when This noise can be unpleasant for drivers, especially when idling, and automobile manufacturers and suppliers of the high-pressure fuel pump 103 are competing to reduce this noise.
- This embodiment aims to reduce noise when the anchor 204 and suction valve 203 are completely closed.
- the current that drives the high-pressure fuel pump 103 is roughly divided into two. They are the peak current (the diagonal line part of the current waveform in FIG. 3) and the holding current (the horizontal line part of the current waveform in FIG. 3).
- the peak current applies momentum to close the suction valve 203 and the anchor 204, which are pressed by the first spring 209 and are stationary at the valve open position.
- the holding current attracts the anchor 204 approaching the fixed part 206 until it collides with the fixed part 206. After the anchor 204 collides with the fixed part 206, the contact state is maintained. If the peak current application amount is reduced, the force of closing the suction valve 203 and the anchor 204 will be weakened, and noise can be reduced.
- the peak current application amount is reduced too much, the suction valve 203 and the anchor 204 will fail to close. Therefore, it is desirable to reduce the peak current application amount as much as possible within the range in which the suction valve 203 and the anchor 204 are closed. Note that, as shown in FIG. 3, the maximum current value of the peak current is Im, and the maximum current value of the holding current is Ik.
- FIG. 4 is a block diagram showing the high pressure fuel pump 103 according to the first embodiment.
- the role of the high-pressure fuel pump 103 is to compress the fuel in the low-pressure pipe 111 and discharge it to the high-pressure pipe 104 so as to maintain the fuel pressure in the high-pressure pipe 104 at a target value.
- the fuel pressure in the high pressure pipe 104 is measured by the fuel pressure sensor 401, and the current application start timing (P-ON timing) is adjusted according to the block diagram shown in FIG. 4 so that the fuel pressure measurement value follows the target fuel pressure. It is controlled by a discharge amount control section 403. Controlling the current application start timing (P-ON timing) is discharge amount control.
- the P-ON timing is advanced in order to increase the discharge amount delivered to the high pressure pipe 104.
- the P-ON timing is delayed in order to reduce the discharge amount delivered to the high pressure pipe 104.
- PID control is generally applied to discharge amount control.
- cam 201 near the plunger 202 may be provided with a plunger phase measuring section 402 that measures the phase angle of the plunger 202.
- FIG. 5A is an explanatory diagram showing the operation of the valve body when the valve closes successfully according to the present embodiment
- FIG. 5B is an explanatory diagram showing the operation of the valve body when the valve close according to the present embodiment fails.
- reducing the peak current application amount reduces the speed at which the valve element of the suction valve 203 closes, achieving quieter operation.
- the noise can be made quieter by reducing the peak current, but if the peak current is reduced too much, the suction valve 203 and anchor 204 will fail to close. If a sufficient peak current is applied, the valve body of the suction valve 203 moves as shown in FIG. 5A. However, if an insufficient peak current is applied, the valve body of the suction valve 203 fails to close due to the spring force of the first spring 209, as shown in FIG. 5B.
- FIG. 6 is a conceptual diagram illustrating a method for determining whether the suction valve 203 has closed successfully based on the rise in fuel pressure that is synchronized with the rise of the plunger 202 according to the present embodiment.
- the success or failure of closing the suction valve 203 is determined based on the fuel pressure fluctuations synchronized with the vertical movement of the plunger 202, and the amount of current applied is increased or decreased, thereby realizing the closing of the suction valve 203.
- the current can be controlled near the minimum amount of current applied. Control of this current is noise reduction control.
- the noise reduction control can reduce the noise when the high-pressure fuel pump 103 closes.
- FIG. 7 is an explanatory diagram showing changes in fuel pressure when the present invention is not applied.
- FIG. 7 shows the relationship among the fuel pressure in the high-pressure pipe 104, the current application start timing P-ON, and the amount of current application when discharge amount control and noise reduction control are applied to the high-pressure fuel pump 103.
- the fuel pressure pulsates at a period of 37.5 ms until around 150 ms.
- the reason why this pulsation occurs is that when the suction valve 203 is successfully closed, the pressure increase due to the rise of the plunger 202 is transmitted to the high-pressure pipe 104, while the pressure in the high-pressure pipe 104 decreases due to fuel injection from the direct injection injector 105. This is because what you do is repeated.
- the amount of current applied at this time gradually decreases while the suction valve 203 is successfully closed for up to 150 ms.
- the amount of current applied increases in the cycle from 150 ms to 187.5 ms because a failure in closing the suction valve 203 was detected.
- the current application start timing becomes rapidly early around 200 ms. This is because the discharge amount control determines that the fuel pressure has decreased because the current application amount has been reduced too much and the suction valve 203 has failed to close, but the fuel pressure has decreased because the current application start timing is late. . This is because the discharge amount control advances the current application start timing to compensate for the decrease in fuel pressure.
- Such a phenomenon is called interference between noise reduction control and discharge amount control, and this embodiment provides a solution to this interference.
- the ECU 112 performs cooperative control of the discharge amount control and noise reduction control (hereinafter referred to as interference reduction control) in order to reduce the interference between the discharge amount control and the noise reduction control described above.
- the discharge amount control is performed at a cycle of 10 ms.
- the noise reduction control is performed at a 2ms cycle.
- the cycle of the discharge amount control does not need to be as short as the cycle of the noise reduction control.
- the cycle of the discharge amount control may be matched with the cycle of the noise reduction control in order to simplify the software, it is necessary to take into account that the calculation load will increase.
- FIG. 8 is a block diagram showing the high-pressure fuel pump 103 and each control section of the ECU 112 according to the present embodiment. High pressure fuel pump 103 is controlled by ECU 112.
- the fuel pressure sensor 401 is arranged in the high pressure pipe 104.
- a plunger phase measuring section 402 that measures the phase angle of the plunger 202 is provided on the cam 201 near the plunger 202 .
- the plunger phase measurement unit 402 is a rotation angle sensor that detects the rotation angle of the cam 201, and measures the phase of the plunger 202 from the rotation angle of the cam 201.
- the ECU 112 includes a plunger operation determination unit 801 that determines that the plunger 202 is rising based on the phase angle of the plunger 202.
- the ECU 112 includes a fuel pressure increase evaluation section 802 that evaluates an increase in fuel pressure during a period in which the plunger operation determination section 801 determines that the plunger 202 is rising.
- the ECU 112 includes a valve closing determination section 803 that determines whether or not the intake valve 203 has been closed based on the evaluation result of the fuel pressure increase evaluation section 802.
- the ECU 112 includes a discharge amount control unit 804 that controls the amount of fuel discharged by controlling the timing to start applying current to the solenoid 205 based on the fuel pressure measured by the fuel pressure sensor 401 and the target fuel pressure.
- the discharge amount control unit 804 determines a control gain for the current application start timing based on the determination result of the valve closing determination unit 803. That is, the discharge amount control unit 804 reduces the control gain of the current application start timing when the determination result of the valve closing determination unit 803 is a failure in closing the valve.
- the discharge amount control unit 804 determines the current application start timing based on a predetermined relationship between the fuel pressure and the current application start timing. Control to speed up. In other words, the discharge amount control section 804 controls the control gain of the current application start timing based on the determination result of the valve closing determination section 803 in the immediately previous control cycle when the current application amount control section 805 controls the amount of current applied to the solenoid. control to speed up the process.
- the ECU 112 includes a current application amount control section 805 that controls the amount of current applied to the solenoid 205 based on the determination result of the valve closing determination section 803.
- FIG. 9 is a flowchart showing the noise reduction control executed every 2 ms according to this embodiment.
- the ECU 112 uses the plunger phase measuring unit 402 to detect high pressure based on the crank angle calculated from the crank angle sensor and the phase difference between the cam angle and crank angle from the variable valve mechanism control device.
- the phase angle of the plunger 202 of the fuel pump 103 is calculated (step 901).
- the plunger operation determination unit 801 of the ECU 112 determines whether the plunger phase angle reaches the preset start angle of the fuel pressure change calculation range (step 902). In step 902, if the plunger phase angle has reached the preset start angle of the fuel pressure change calculation range, the process proceeds to step 903. In step 902, if the plunger phase angle has not reached the preset start angle of the fuel pressure change calculation range, the process proceeds to step 904.
- the fuel pressure increase evaluation unit 802 of the ECU 112 sets the fuel pressure measurement value to the fuel pressure at the start of the increase (step 903). After the processing in step 903, wait for the next 2ms interrupt.
- the plunger operation determination unit 801 of the ECU 112 determines whether the phase angle of the plunger 202 has reached the end angle of the preset fuel pressure change calculation range (step 904). In step 904, if the plunger phase angle has reached the end angle of the preset fuel pressure change calculation range, the process proceeds to step 905. In step 904, if the plunger phase angle has not reached the end angle of the preset fuel pressure change calculation range, after the process in step 904, the ECU 112 waits for the next 2 ms interrupt.
- the fuel pressure increase evaluation unit 802 of the ECU 112 sets the fuel pressure measurement value to the fuel pressure at the end of the increase (step 905).
- the fuel pressure increase evaluation unit 802 of the ECU 112 calculates a fuel pressure increase value by subtracting the fuel pressure at the start of the increase set in steps 903 and 905 from the fuel pressure at the end of the increase (step 906).
- the valve closing determination unit 803 of the ECU 112 determines whether the fuel pressure increase value calculated in step 906 is greater than a threshold value (step 907). In step 907, if the fuel pressure increase value is larger than the threshold value, the process proceeds to step 908, and it is determined that the valve closing has been successful (step 908). After the process in step 908, the process proceeds to step 910. In step 907, if the fuel pressure increase value is not larger than the threshold value, the process proceeds to step 909, and it is determined that the valve closing has failed (step 909). After the process in step 909, the process proceeds to step 911.
- the current application amount control unit 805 of the ECU 112 reduces the current application amount if the valve closing is successful in step 908 (step 910). In the case of valve closing failure, which has proceeded to step 909, the amount of current applied is increased (step 911). After the processing in step 910 and step 911, the ECU 112 waits for the next 2 ms interrupt.
- the noise reduction control by executing the noise reduction control at a 2 ms cycle, the amount of current applied is controlled near the minimum value that allows successful valve closing, and noise reduction is achieved.
- FIG. 10 is a flowchart showing ejection amount control executed every 10 ms according to this embodiment. The discharge amount control is performed at a cycle of 10 ms.
- the discharge amount control unit 804 of the ECU 112 determines whether or not the most recent valve closing determination in the noise reduction control performed at a 2 ms cycle was determined to be a successful valve closing (step 1001). The discharge amount control unit 804 of the ECU 112 selects the fuel pressure feedback gain depending on whether or not it is determined that the valve has closed successfully in step 1001.
- step 1002 determines in step 1001 that the valve has been successfully closed. If the discharge amount control unit 804 of the ECU 112 determines in step 1001 that the valve has been successfully closed, the process proceeds to step 1002.
- the discharge amount control unit 804 of the ECU 112 selects a feedback gain for success (step 1002).
- step 1003 If the discharge amount control unit 804 of the ECU 112 determines in step 1001 that the valve has failed to close, the process proceeds to step 1003.
- the discharge amount control unit 804 of the ECU 112 selects a failure feedback gain that is smaller than the success feedback gain in order to prevent the current application start timing from being excessively advanced even though there is no problem with the discharge amount control. (step 1003).
- the discharge amount control unit 804 of the ECU 112 reads a fuel pressure sensor signal representing the fuel pressure from the fuel pressure sensor 401 (step 1004). After the process in step 1004, the ECU 112 advances the process to step 1005.
- the discharge amount control unit 804 of the ECU 112 controls the current application start timing, for example, by PID control, using the gain determined earlier according to the difference between the fuel pressure read in step 1004 and the target fuel pressure (step 1005). .
- the ECU 112 waits for a 10ms interrupt.
- FIG. 11 is an explanatory diagram showing how pressure pulsation is reduced according to this embodiment.
- this embodiment it is possible to reduce the feedback gain of the discharge amount control when the valve fails to close. Thereby, it is possible to prevent the current application start timing from becoming too early.
- FIG. 11 shows an example of fuel pressure, current application amount, and current application start timing when this control is applied.
- the current application start timing is suppressed from becoming too early 187.5 ms after the valve closing failure is detected. This shows that the non-pulsation of the fuel pressure can be reduced.
- FIG. 12 is a block diagram showing the high-pressure fuel pump 103 according to this embodiment.
- the ECU 112 controls a first current application amount control unit (current application amount control unit in the first embodiment) 1201 that controls the amount of current applied to the solenoid 205 only when the operating state of the internal combustion engine 100 is determined to be an idle state. Be prepared. Specifically, the first current application amount control unit 1201 executes first current control to control the amount of current applied to the solenoid 205 based on the determination result of the valve closing determination unit 803.
- ECU 112 includes a second current application amount control unit 1202 that executes second current control that controls the amount of current applied to solenoid 205 based on the relationship between a predetermined target fuel pressure and current application start timing.
- the ECU 112 includes an idle determination unit 1203 that determines whether the operating state of the internal combustion engine 100 is an idle state. When it is determined that the operating state of the internal combustion engine 100 is the idle state, the ECU 112 executes noise reduction control (first current control) by the first current application amount control unit 1201. When it is determined that the operating state of internal combustion engine 100 is not the idle state, ECU 112 causes second current application amount control section 1202 to perform second current control.
- the configuration of this embodiment adds an idle determination unit 1203 that determines whether the operating state of the internal combustion engine 100 is an idle state to the configuration shown in FIG. Further, when the operating state of the internal combustion engine 100 is other than the idle state, the current parameter of the second current application amount control unit 1202 is used to control the current application amount using a predetermined current parameter without performing noise reduction control.
- a current parameter memory 1204 is added that stores the current parameter memory 1204.
- FIG. 13 is an explanatory diagram showing a map showing the correlation between target fuel pressure and current application timing according to the second embodiment.
- the current parameter map shown in FIG. 13 is a map showing the correlation between the target fuel pressure and the current application timing obtained in advance through experiments, etc., and is stored in the current parameter memory 1204.
- the current parameter map shows a tendency that when the target fuel pressure is high, the current application start timing is early, and when the target fuel pressure is low, the current application start timing is late.
- the second current application amount control unit 1202 of the ECU 112 determines the current application start timing according to the target fuel pressure using a map of current parameters. In the current parameter map, when the measured value of the fuel pressure is lower than the target fuel pressure, the current application start timing is controlled to be early, and when it is higher than the target fuel pressure, it is controlled to be delayed.
- FIG. 14 is a flowchart showing interference reduction control between discharge amount control and noise reduction control (first current application amount control) according to the operating state of the internal combustion engine according to the present embodiment.
- the idle determination unit 1203 of the ECU 112 determines whether or not the internal combustion engine 100 is in an idle state based on the idle signal from the ECU 112, the rotation speed of the internal combustion engine, the load, etc. (step 1401). If the determination result in step 1401 is that the device is in an idle state, the process proceeds to step 1402. If the determination result in step 1401 is other than the idle state, the process proceeds to step 1403.
- step 1401 If the determination result in step 1401 is the idle state, the noise reduction control in the first current application amount control unit 1201 shown in FIG. 9 is performed at a 2 ms cycle (step 1402), and the discharge amount control shown in FIG. is performed at a period of 10 ms (step 1403).
- the flow of this process is the same as in the first embodiment, so noise reduction control is performed based on the valve closure detection result, and the gain of the discharge amount control is suppressed when the valve is closed.
- step 1401 discharge amount control is performed every 10 ms (step 1403).
- the second current application amount control unit 1202 performs second current control (step 1404).
- the noise reduction control is not performed, the second current application amount control is performed based on the current parameter memory 1204, and the feedback control based on the fuel pressure when the plunger 202 rises is not performed.
- the noise reduction control can be executed only when the operating state of the internal combustion engine 100 is the idle state.
- valve closing failure occurs with a certain frequency.
- failure to close the valve causes fuel pressure pulsations.
- the influence of fuel pressure pulsations is reduced. Therefore, by limiting implementation of the noise reduction control when the operating state of the internal combustion engine 100 is in the idle state, the influence of pulsation can be suppressed to an acceptable level.
- the discharge amount control unit 804 reduces the feedback gain when it is determined that the valve has failed to close. This prevents the current application start timing from being unnecessarily advanced due to a decrease in fuel pressure due to a failure in valve closing due to excessively restricting the current for noise reduction control.
- the current application start timing is held as a map of the target fuel pressure. And, fuel pressure feedback is not performed.
- valve closing is detected based on an increase in fuel pressure in synchronization with the plunger 202, and the amount of current applied is gradually reduced while the valve is successfully closed, and the amount of current applied is increased when the valve fails to close. Then, the amount of current applied was adapted to each individual. In the method of the first embodiment, the amount of current applied is maintained near the minimum amount of current applied for each individual by intentionally causing the valve to fail to close at a certain frequency. However, there are cases where fuel pressure pulsations due to valve closing failure using the method of the first embodiment cannot be tolerated.
- the pump learns the minimum current application amount to close the pump when the key is turned on, controls the pump with the minimum current value based on this learning, and if the valve fails to close due to disturbances such as fuel pressure fluctuations, It is desirable to change the feedback gain so that the current application start timing P-ON does not become earlier than necessary.
- FIG. 15 is a block diagram showing the high-pressure fuel pump 103 according to this embodiment.
- the ECU 112 controls a first current application amount control section (current control in the first embodiment) that executes noise reduction control (first current control) that controls the amount of current applied to the solenoid 205 based on the determination result of the valve closing determination section 803. (application amount control unit) 1201.
- the ECU 112 includes a third current application amount control unit 1501 that executes third current control that controls the amount of current applied to the solenoid 205 based on the relationship between the predetermined current application start timing and the amount of current application.
- the third current control is a control in which the current application amount is determined according to the current application start timing using the current parameter map in the current parameter memory 1503 without performing feedback control based on the fuel pressure when the plunger 202 rises.
- the ECU 112 includes a learning period determination unit 1502 that determines whether or not it is a learning period for learning the minimum current application amount for valve closing of the high-pressure fuel pump 103. During the learning period, the ECU 112 executes noise reduction control by the first current application amount control section 1201. The ECU 112 acquires the determination result of the valve closing determination section 803 at predetermined intervals other than the learning period, and executes the third current control by the third current application amount control section 1501 based on the acquired determination result.
- the configuration of this embodiment adds a learning period determination unit 1502 that determines whether the operating state of the internal combustion engine 100 is in the learning period to the configuration of FIG. Additionally, a current parameter memory 1503 stores current parameters of the third current application amount control section 1501 for controlling the current application amount using predetermined current parameters without performing noise reduction control during periods other than the learning period. is added.
- FIG. 16 is an explanatory diagram showing a map for adjusting the correlation between the current application start timing and the current application amount stored in the current parameter memory 1503 according to the present embodiment by learning for each individual.
- the current parameter map shown in FIG. 16 is a map that adjusts the correlation between the current application start timing and the current application amount obtained in advance through experiments etc. by learning for each individual, and is stored in the current parameter memory 1503. .
- the current parameter map shows a plurality of characteristic lines showing a tendency that when the current application start timing is high, the current application amount is low, and when the current application start timing is low, the current application amount timing tends to be high.
- a plurality of characteristic lines showing this tendency are used by moving them mainly in the direction of the magnitude of the applied current according to the learning for each individual.
- the third current application amount control unit 1501 of the ECU 112 determines the current application amount according to the current application start timing as third current control using a current parameter map.
- FIG. 17 is a flowchart showing interference reduction control between the discharge amount control and the first current application control (silence control) according to the learning state of the internal combustion engine 100 according to the present embodiment.
- the learning determination unit 1502 of the ECU 112 determines whether or not the internal combustion engine 100 is in the learning period based on the idle signal from the ECU 112, the rotation speed of the internal combustion engine 100, the load, etc. Determine (step 1701). If the determination result in step 1401 is that it is a learning period, the process proceeds to step 1702. If the determination result in step 1701 is that the period is other than the learning period, the process proceeds to step 1703.
- step 1701 If the determination result in step 1701 is the learning period, the noise reduction control (first current application amount control) in the first current application amount control unit 1201 shown in FIG. 9 is performed at a 2 ms cycle (step 1702), and , the discharge amount control shown in FIG. 10 is performed at a 10 ms cycle (step 1703).
- the flow of this process is the same as in the first embodiment, so noise reduction control is performed based on the valve closure detection result, and the gain of the discharge amount control is suppressed when the valve is closed.
- step 1701 If the determination result in step 1701 is that it is outside the learning period, ejection amount control is performed every 10 ms (step 1703).
- the valve closing determination unit 803 of the ECU 112 performs a valve closing determination (step 1704).
- the noise reduction control is not performed
- the third current application amount control 1501 is performed based on the current parameter memory 1503, and the feedback control based on the fuel pressure when the plunger 202 rises is not performed.
- the gain of the feedback control of the PON timing is changed based on whether the valve closing was successful or failed in the most recent valve closing determination. This prevents excessive control from being misunderstood as a decrease in fuel pressure due to PON timing control due to a failure in valve closing.
- Communication port 222... Outflow port, 223...Casing, 225...Inflow port, 226...Spring section, 401...Fuel pressure sensor, 402...Plunger phase measurement section, 403...Discharge amount control section, 801...Plunger operation determination section, 802...Fuel pressure increase evaluation section, 803...Closed Valve determination section, 804... Discharge amount control section, 805... Current application amount control section, 1201... First current application amount control section, 1202... Second current application amount control section, 1203... Idle determination section, 1204... Current parameter memory , 1501...Third current application amount control unit, 1502...Learning period determination unit, 1503...Current parameter memory.
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Abstract
Description
本実施形態は、ソレノイドに電流を流さないときに、弁体が開弁している。そして、ソレノイドに電流を流すと、弁体が閉弁し、この閉弁によってプランジャの上昇により圧縮された燃料が低圧配管側に戻ることを妨げ、燃料を高圧配管側に吐出する。このような動作を行うノーマルオープン型のポンプについて述べる。しかし、本実施形態は、閉弁と開弁とを置き換えれば、ノーマルクローズ型のポンプにも適用できる。
図1は、本実施形態に係る内燃機関100を示す概略構成図である。図1には、内燃機関100として、直噴内燃機関の概略が示されている。内燃機関100では、燃料タンク101に蓄えられた燃料がフィードポンプ102によって0.4MPa程度に加圧され、さらに低圧配管111を経由して高圧燃料ポンプ103によって数十MPaに加圧される。加圧された燃料は、高圧配管104を経由し、直噴インジェクタ105から内燃機関100の気筒106に噴射される。
図2は、本実施形態に係る高圧燃料ポンプ103を示す概略構成図である。図2には、高圧燃料ポンプ103の構造が示されている。高圧燃料ポンプ103は、内燃機関100のクランク軸110に取り付けられたカム201の回転により上下するプランジャ202を備える。プランジャ202は、加圧室211内の燃料を圧縮する。
図3は、本実施形態に係る高圧燃料ポンプ103の動作を示すタイムチャートである。吸入弁203は、プランジャ202の上下に同期して開閉動作するように、クランク軸110に取り付けられたカム201の回転角を検出し、例えば上死点(TDC:Top Dead Center)から決められた角度(P-ONタイミング)をクランク軸110が回転したのちに、ソレノイド205の両端に電圧Vを与え始める(タイミングt1)。この電圧Vにより、ソレノイド205に流れる電流Iは、
LdI/dt=V-RI・・・(式1)
に従い増加する。ここで、L、Rは、それぞれ、ソレノイド205と配線のインダクタンスと抵抗である。電流Iの増加に伴い固定部(磁気コア)206がアンカ204を吸引する磁気吸引力Fmagも増加する。
高圧燃料ポンプ103を駆動する電流は、大まかに2つに分けられている。ピーク電流(図3の電流波形の斜線部)と保持電流(図3の電流波形の横線部)とである。ピーク電流は、第1スプリング209に押さえ付けられて開弁位置に静止している吸入弁203とアンカ204とに、閉弁するための勢いをつける。一方、保持電流は、固定部206に近づいたアンカ204を、固定部206に衝突するまで引き付ける。そして、アンカ204が固定部206に衝突した後は、接触状態を維持する。ピーク電流印加量を低減すれば、吸入弁203とアンカ204との閉弁の勢いが弱くなり、騒音が低減できる。しかし、ピーク電流印加量を低減し過ぎると、吸入弁203とアンカ204との閉弁が失敗する。したがって、吸入弁203とアンカ204とを閉弁する範囲で可能な限りピーク電流印加量を低減したい。なお、図3に示すようにピーク電流の最大電流値をIm、保持電流の最大電流値をIkとする。
図4は、第1実施形態に係る高圧燃料ポンプ103を示すブロック図である。高圧燃料ポンプ103の役割は、高圧配管104内の燃圧を目標値に保つように、低圧配管111の燃料を圧縮して高圧配管104に吐出することである。そのために、高圧配管104内の燃圧を燃圧センサ401で計測し、燃圧計測値が目標燃圧に追従するように、図4に示すようなブロック図に従い、電流印加開始タイミング(P-ONタイミング)を吐出量制御部403によって制御している。電流印加開始タイミング(P-ONタイミング)を制御することが吐出量制御である。吐出量制御では、燃圧計測値が目標燃圧より低ければ、高圧配管104に吐出する吐出量を増やすためにP-ONタイミングは早くされる。吐出量制御では、燃圧計測値が目標燃圧より高ければ、高圧配管104に吐出する吐出量を減らすためにP-ONタイミングは遅くされる。吐出量制御では、一般的にPID制御が適用される。
図5Aは、本実施形態に係る閉弁成功時の弁体の動作を示す説明図であり、図5Bは、本実施形態に係る閉弁失敗時の弁体の動作を示す説明図である。前の<<ピーク電流と保持電流>>で述べたように、ピーク電流印加量を低減すると、吸入弁203の弁体の閉弁時の速度が低減され、静音化が実現される。
図7は、本発明を適用しない場合の燃圧の変化を示す説明図である。図7には、吐出量制御と静音化制御とを高圧燃料ポンプ103に適用した場合の、高圧配管104の燃圧、電流印加開始タイミングP-ON、電流印加量の関係が示されている。
ECU112は、先述の吐出量制御と静音化制御との干渉を低減するため、吐出量制御と静音化制御の協調制御(以下、干渉低減制御と記す)を実施する。ここで、吐出量制御は、10ms周期で実施する。静音化制御は、2ms周期で実施する。必ずしもこの周期に限定されるわけではないが、静音化制御は、プランジャ202の上昇に同期した燃圧の脈動を検知する必要があるので、この脈動を検出することができる十分に短い周期でなくてはならない。また、吐出量制御の周期は、静音化制御の周期ほど短くする必要はない。ソフトウェアの単純化等のために吐出量制御の周期を静音化制御の周期に合わせてもいいが、計算負荷が増大することを考慮する必要がある。
<<静音化制御の処理の流れ>>
図9は、本実施形態に係る2ms毎に実行される静音化制御を示すフローチャートである。
図10は、本実施形態に係る10ms毎に実行される吐出量制御を示すフローチャートである。吐出量制御は10ms周期で行われる。
図11は、本実施形態に係る圧力脈動の低減の様子を示す説明図である。本実施形態によれば、閉弁失敗時の吐出量制御のフィードバックゲインを低減することができる。これにより、電流印加開始タイミングの過度の早期化を抑制できる。この制御を適用した際の、燃圧と電流印加量と電流印加開始タイミングの一例が図11に示されている。本実施形態の適用前の図7と比較すると、閉弁失敗が検知された187.5ms後の電流印加開始タイミングの過度の早期化が抑制される。これにより、燃圧の無脈動が低減できていることが分かる。
本実施形態では、内燃機関100の運転状態がアイドル状態ときに限定した静音化について述べる。内燃機関100の運転状態がアイドル状態の場合には、高圧燃料ポンプ103以外の騒音が小さい。このため、高圧燃料ポンプ103の作動音が目立つ。この理由から、運転状態がアイドル状態のときに限定し、静音化制御を行いたいというニーズがある。そこで、内燃機関100の運転状態がアイドル状態と判定されたときのみ、ソレノイド205の電流印加量を制御する。
図12は、本実施形態に係る高圧燃料ポンプ103を示すブロック図である。ECU112は、内燃機関100の運転状態がアイドル状態と判定されたときのみ、ソレノイド205の電流印加量を制御する第1電流印加量制御部(第1実施形態での電流印加量制御部)1201を備える。詳しくは、第1電流印加量制御部1201は、閉弁判定部803の判定結果に基づきソレノイド205への電流印加量を制御する第1電流制御を実行する。ECU112は、予め定められた目標燃圧と電流印加開始タイミングとの関係に基づきソレノイド205への電流印加量を制御する第2電流制御を実行する第2電流印加量制御部1202を備える。ECU112は、内燃機関100の運転状態がアイドル状態であるか否かを判定するアイドル判定部1203を備える。内燃機関100の運転状態がアイドル状態であると判定されたときには、ECU112は、第1電流印加量制御部1201による静音化制御(第1電流制御)が実行される。内燃機関100の運転状態がアイドル状態でないと判定されたときには、ECU112は、第2電流印加量制御部1202による第2電流制御が実行される。
図13は、第2実施形態に係る目標燃圧と電流印加タイミングとの相関を表すマップを示す説明図である。図13に示される電流パラメータのマップは、予め実験などで取得された目標燃圧と電流印加タイミングとの相関を表すマップであり、電流パラメータメモリ1204に記憶されている。
図14は、本実施形態に係る内燃機関の運転状態に応じた吐出量制御と静音化制御第1電流印加量制御)との干渉低減制御を示すフローチャートである。
本実施形態によれば、内燃機関100の運転状態がアイドル状態のときに限定して静音化制御を実行することができる。静音化制御を行うと、一定の頻度で閉弁失敗が起こる。しかし、閉弁失敗は、燃圧脈動の原因となる。内燃機関100の運転状態がアイドル状態の際には、燃圧脈動の影響が小さくなる。そのため、内燃機関100の運転状態がアイドル状態のときに静音化制御の実施を限定することで、脈動の影響が受け入れられるレベルに抑えられる。
第1実施形態では、吐出量制御部804は、閉弁失敗と判定されたときにフィードバックゲインを低減する。これにより、静音化制御のための電流の絞りすぎによる閉弁失敗に基づく燃圧低下によって、電流印加開始タイミングが不要に進角されるのを低減している。
本実施形態によれば、閉弁失敗と認識されたときに電流印加開始タイミングを目標燃圧のマップとして保持し、燃圧のフィードバックを行わない。このため、閉弁失敗と認識されたときには、簡易なマップによる制御になり、過剰な電流印加開始タイミングの進角を抑制し、燃圧脈動を低減することができる。
第1実施形態では、プランジャ202に同期した燃圧の上昇に基づき閉弁を検知し、閉弁成功している間は徐々に電流印加量を低減させ、閉弁失敗したら電流印加量を増加させることで、電流印加量を個体ごとに適応させた。第1実施形態の方法では、ある頻度で意図的に閉弁失敗させることで、個体ごとの最小電流印加量付近に電流印加量を保持している。ところが、第1実施形態のような方法による閉弁失敗による燃圧脈動が許容できない場合もある。
図15は、本実施形態に係る高圧燃料ポンプ103を示すブロック図である。ECU112は、閉弁判定部803の判定結果に基づきソレノイド205への電流印加量を制御する静音化制御(第1電流制御)を実行する第1電流印加量制御部(第1実施形態での電流印加量制御部)1201を備える。ECU112は、予め定められた電流印加開始タイミングと電流印加量との関係に基づきソレノイド205への電流印加量を制御する第3電流制御を実行する第3電流印加量制御部1501を備える。第3電流制御は、プランジャ202上昇時の燃圧に基づくフィードバック制御を行わず、電流パラメータメモリ1503の電流パラメータのマップを用いて電流印加開始タイミングに応じて、電流印加量を決定する制御である。ECU112は、高圧燃料ポンプ103の閉弁最小電流印加量を学習する学習期間であるか否かを判定する学習期間判定部1502を備える。ECU112は、学習期間中には、第1電流印加量制御部1201による静音化制御を実行する。ECU112は、学習期間以外には、所定期間毎に閉弁判定部803の判定結果を取得し、取得した判定結果に基づき、第3電流印加量制御部1501による第3電流制御を実行する。
図16は、本実施形態に係る電流パラメータメモリ1503に記憶された電流印加開始タイミングと電流印加量との相関を個体毎の学習によって調整するマップを示す説明図である。図16に示される電流パラメータのマップは、予め実験などで取得された電流印加開始タイミングと電流印加量との相関を個体毎の学習によって調整するマップであり、電流パラメータメモリ1503に記憶されている。
図17は、本実施形態に係る内燃機関100の学習状態に応じた吐出量制御と第1電流印加制御(静音化制御)との干渉低減制御を示すフローチャートである。
本実施形態によれば、燃圧等の急変により閉弁失敗した場合でも、閉弁失敗による燃圧変動で過剰なPON制御が起こることを防ぐことができる。
Claims (5)
- 低圧配管の燃料を高圧配管に加圧して吐出するために両配管の間に配置され、前記低圧配管と加圧室の間に配置された吸入弁と、前記吸入弁の開閉を制御するソレノイドと、前記加圧室内の燃料を圧縮するプランジャと、を少なくとも含む高圧燃料ポンプを制御する制御装置であって、
前記高圧配管には、燃圧センサが配置され、
前記プランジャ近傍には、前記プランジャの位相角を計測するプランジャ位相計測部が設けられ、
前記プランジャの位相角に基づき前記プランジャが上昇していると判定するプランジャ動作判定部と、
前記プランジャ動作判定部により前記プランジャが上昇していると判定された期間における燃圧の上昇を評価する燃圧上昇評価部と、
前記燃圧上昇評価部の評価結果に基づき前記吸入弁の閉弁の成否を判定する閉弁判定部と、
前記燃圧センサが計測する燃圧と目標燃圧とに基づき前記ソレノイドへの電流印加開始タイミングを制御することにより燃料の吐出量を制御する吐出量制御部と、
を備え、
前記吐出量制御部は、前記閉弁判定部の判定結果に基づき電流印加開始タイミングの制御ゲインを決定する
高圧燃料ポンプの制御装置。 - 請求項1に記載の高圧燃料ポンプの制御装置において、
前記閉弁判定部の判定結果に基づき前記ソレノイドへの電流印加量を制御する電流印加量制御部をさらに備える
高圧燃料ポンプの制御装置。 - 請求項1に記載の高圧燃料ポンプの制御装置において、
前記吐出量制御部は、前記閉弁判定部の判定結果が閉弁の失敗であるときに、電流印加開始タイミングの制御ゲインを低減する
高圧燃料ポンプの制御装置。 - 請求項1に記載の高圧燃料ポンプの制御装置において、
前記吐出量制御部は、前記閉弁判定部の判定結果が閉弁の失敗であるときに、予め定められた燃圧と電流印加開始タイミングとの関係に基づいて、電流印加開始タイミングを制御する
高圧燃料ポンプの制御装置。 - 請求項2に記載の高圧燃料ポンプの制御装置において、
前記電流印加量制御部は、内燃機関の運転状態がアイドル状態と判定されたときのみ、前記ソレノイドの電流印加量を制御する
高圧燃料ポンプの制御装置。
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JP2007327409A (ja) * | 2006-06-07 | 2007-12-20 | Toyota Motor Corp | 内燃機関の燃料供給装置 |
JP2017053247A (ja) | 2015-09-08 | 2017-03-16 | 株式会社デンソー | 高圧燃料ポンプの電磁弁の制御装置及び高圧燃料ポンプの電磁弁の制御方法 |
JP2021032178A (ja) * | 2019-08-27 | 2021-03-01 | 日立オートモティブシステムズ株式会社 | 電磁アクチュエータ制御装置、高圧燃料ポンプおよびインジェクタ |
JP2021134760A (ja) * | 2020-02-28 | 2021-09-13 | 日立Astemo株式会社 | 高圧燃料ポンプの制御装置 |
WO2021245984A1 (ja) * | 2020-06-03 | 2021-12-09 | 日立Astemo株式会社 | 電磁弁制御装置 |
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JP2007327409A (ja) * | 2006-06-07 | 2007-12-20 | Toyota Motor Corp | 内燃機関の燃料供給装置 |
JP2017053247A (ja) | 2015-09-08 | 2017-03-16 | 株式会社デンソー | 高圧燃料ポンプの電磁弁の制御装置及び高圧燃料ポンプの電磁弁の制御方法 |
JP2021032178A (ja) * | 2019-08-27 | 2021-03-01 | 日立オートモティブシステムズ株式会社 | 電磁アクチュエータ制御装置、高圧燃料ポンプおよびインジェクタ |
JP2021134760A (ja) * | 2020-02-28 | 2021-09-13 | 日立Astemo株式会社 | 高圧燃料ポンプの制御装置 |
WO2021245984A1 (ja) * | 2020-06-03 | 2021-12-09 | 日立Astemo株式会社 | 電磁弁制御装置 |
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