WO2022049838A1 - Dispositif de commande d'injection - Google Patents

Dispositif de commande d'injection Download PDF

Info

Publication number
WO2022049838A1
WO2022049838A1 PCT/JP2021/018725 JP2021018725W WO2022049838A1 WO 2022049838 A1 WO2022049838 A1 WO 2022049838A1 JP 2021018725 W JP2021018725 W JP 2021018725W WO 2022049838 A1 WO2022049838 A1 WO 2022049838A1
Authority
WO
WIPO (PCT)
Prior art keywords
capacitor
switching element
voltage
injection
auxiliary capacitor
Prior art date
Application number
PCT/JP2021/018725
Other languages
English (en)
Japanese (ja)
Inventor
篤朗 古森
Original Assignee
日立Astemo株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日立Astemo株式会社 filed Critical 日立Astemo株式会社
Priority to JP2022546891A priority Critical patent/JP7307860B2/ja
Publication of WO2022049838A1 publication Critical patent/WO2022049838A1/fr

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/20—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
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • 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 an injection control device that controls the drive of an injection device that injects fuel into an internal combustion engine.
  • the injection control device controls the amount of fuel injected from the injection device by controlling the supply time (energization time) and the amount of current of the drive current to the solenoid constituting the injection valve of the injection device.
  • a voltage boosted by a booster circuit is often applied to a booster capacitor to store an electric charge, and the stored electrical energy is used to supply a drive current to a solenoid.
  • the injection control device supplies a large current (hereinafter, also referred to as “peak current”) required for opening the closed injection valve to the solenoid at the initial stage of energization of the solenoid to quickly open the injection valve.
  • peak current a large current
  • the injection control device supplies a constant current (hereinafter, also referred to as “valve opening holding current”) to the solenoid to maintain the valve opening state of the injection valve.
  • the charging voltage of the boosting capacitor may drop once the injection is performed. After that, if proximity injection is performed such that the next injection is performed before the charging of the boosting capacitor is completed, the drive voltage applied to the solenoid is lower than in the normal state, and the time to reach the peak current becomes longer. As a result, the opening speed of the injection valve may decrease, and the amount of fuel injected may vary greatly. Variations in the amount of fuel injected affect the exhaust performance of the internal combustion engine.
  • Patent Document 1 a technique for suppressing variation in the amount of fuel injected by providing a plurality of boosting capacitors, providing a switching element on the circuit from each boosting capacitor to the solenoid, and switching the boosting capacitor used for each injection by the switching element.
  • the technique described in Patent Document 1 since the switching element is interposed in all the boosting capacitors, the drive voltage applied to the solenoid is lowered due to the energy loss in the switching element regardless of the presence or absence of proximity injection. .. Further, the technique described in Patent Document 1 has room for further improvement in that the drive voltage is lowered due to the proximity injection. As a result, the technique described in Patent Document 1 may reduce the valve opening speed of the injection valve and may not be able to suppress variations in the amount of fuel injected.
  • the present invention has been made in view of the above, and an object of the present invention is to provide an injection control device capable of suppressing a decrease in the valve opening speed of an injection valve and suppressing a variation in the amount of fuel injected. do.
  • the injection control device is an injection control device that controls the drive current for driving the injection device that injects fuel into the internal combustion engine to control the drive of the injection device.
  • a drive circuit that applies a drive voltage to the injection device to supply the drive current to the injection device, and a drive circuit that is connected to the drive circuit and is charged and charged by a boosted voltage that is boosted from the battery voltage based on the drive voltage.
  • a boosting voltage that applies a voltage to the drive circuit, a switching element connected in series to the booster capacitor, and a switching element connected in series to the switching element, charged by an arbitrary power supply voltage, and a charging voltage applied to the drive circuit.
  • the switching element switches the booster capacitor and the auxiliary capacitor into a conductive state or a non-conducting state, and the auxiliary capacitor is switched between the booster capacitor and the conductive state by the switching element.
  • the charging voltage of the auxiliary capacitor is applied to the drive circuit.
  • an injection control device capable of suppressing a decrease in the valve opening speed of the injection valve and suppressing a variation in the amount of fuel injected. Issues, configurations and effects other than the above will be clarified by the description of the following embodiments.
  • FIG. A time chart illustrating a flow of control of a drive current in the injection control device shown in FIG. 1.
  • FIG. 1 is a diagram illustrating a configuration of the injection control device 10 of the first embodiment.
  • the injection control device 10 is a device that controls the drive of the injection device 1 by controlling the drive current that drives the injection device 1 that injects fuel into the internal combustion engine.
  • the injection control device 10 may be a device that controls the drive of the injection device 1 in the in-cylinder direct injection type internal combustion engine that directly injects fuel into the cylinder.
  • the injection control device 10 may be a device that controls the drive of the injection device 1 capable of executing the proximity injection in which the next injection is performed before the charging of the boosting capacitor C1 is completed.
  • the injection control device 10 may be a device that controls the drive of the injection device 1 capable of simultaneously injecting two opposing cylinders in multiple stages (for example, two-stage injection) in an in-line 4-cylinder direct injection internal combustion engine.
  • the injection control device 10 includes a booster circuit 11, a drive circuit 12, a continuity switching circuit 13, an auxiliary charging circuit 14, and a control IC 15.
  • the booster circuit 11 is a circuit that boosts the voltage of the battery VB.
  • the booster circuit 11 includes an inductor L1, a diode D1, a switching element T3, and a booster capacitor C1.
  • the switching element T3 is composed of, for example, a transistor such as a MOSFET (metal-oxide-semiconductor field-effect transistor), and a freewheeling diode is connected to the transistor in antiparallel.
  • the electrode on the drain side of the switching element T3 is branched and connected from between the inductor L1 and the diode D1.
  • the electrode on the source side of the switching element T3 is connected to the ground.
  • the electrode on the gate side of the switching element T3 is connected to the control IC 15.
  • the step-up capacitor C1 may be composed of, for example, an electrolytic capacitor.
  • the electrode on the high potential side of the boosting capacitor C1 is branched and connected from between the cathode side of the diode D1 and the drive circuit 12.
  • the electrode on the low potential side of the step-up capacitor C1 is connected to the ground. That is, the step-up capacitor C1 is connected in series with the drive circuit 12.
  • the charging voltage Vp of the boosting capacitor C1 is monitored by the control IC 15.
  • the control IC 15 controls the switching operation of the switching element T3 so that the charging voltage Vp of the boosting capacitor C1 reaches the target value of the driving voltage Vd of the injection device 1 during the boosting operation.
  • the drive voltage Vd of the injection device 1 is a voltage required to supply the drive current for driving the solenoids L2 to L5 constituting the injection valve of the injection device 1 to the solenoids L2 to L5. Due to the switching operation of the switching element T3, an electromotive force is generated in the inductor L1, and the energy stored in the inductor L1 is transferred to the step-up capacitor C1 via the diode D1.
  • the boosting capacitor C1 is charged by the boosted voltage boosted from the battery voltage VB based on the target value of the drive voltage Vd.
  • the drive circuit 12 is a circuit that applies a drive voltage Vd to the solenoids L2 to L5 of the injection device 1 to supply a drive current to the solenoids L2 to L5 of the injection device 1.
  • the drive circuit 12 includes switching elements T4 to T9.
  • Each of the switching elements T4 to T9 is composed of a transistor such as a MOSFET, like the switching element T3, and a freewheeling diode is connected to the transistor in antiparallel.
  • the electrodes on the drain side of each of the switching elements T4 and T5 are connected to the booster circuit 11 via the diode D2 of the conduction switching circuit 13.
  • the source-side electrode of the switching element T4 is connected to one end of each of the solenoids L2 and L3.
  • the source-side electrode of the switching element T5 is connected to one end of each of the solenoids L4 and L5.
  • the electrode on the drain side of the switching element T6 is connected to the other end of the solenoid L2.
  • the electrode on the drain side of the switching element T7 is connected to the other end of the solenoid L3.
  • the electrodes on the source side of each of the switching elements T6 and T7 are connected to the ground.
  • the electrode on the drain side of the switching element T8 is connected to the other end of the solenoid L4.
  • the electrode on the drain side of the switching element T9 is connected to the other end of the solenoid L5.
  • the electrodes on the source side of each of the switching elements T8 and T9 are connected to the ground.
  • the electrodes on the gate side of each of the switching elements T4 to T9 are connected to the control IC 15.
  • the switching elements T4 to T9 perform a switching operation for controlling the drive voltage Vd applied to the solenoids L2 to L5.
  • the switching operation of the switching elements T4 to T9 is controlled by the control IC 15.
  • the control IC 15 of the switching elements T4 to T9 so that the drive voltage Vd corresponding to the peak current for quickly opening the injection valve of the closed injection device 1 is applied to the solenoids L2 to L5.
  • the drive circuit 12 can supply the peak current for quickly opening the injection valve of the closed injection device 1 to the solenoids L2 to L5 as a drive current.
  • control IC 15 is a switching element provided in a constant current circuit (not shown) so that the drive voltage Vd corresponding to the valve opening holding current for maintaining the valve opening state of the injection valve is applied to the solenoids L2 to L5. Controls the switching operation of.
  • the conventional configuration can be diverted as the constant current circuit, the illustration and description thereof will be omitted.
  • the auxiliary charging circuit 14 is a circuit that assists the charging voltage Vp of the boosting capacitor C1 applied to the drive circuit 12.
  • the auxiliary charging circuit 14 includes an auxiliary capacitor C2, a diode D3, a switching element T2, and a power supply Vcc.
  • the power supply Vcc is an arbitrary DC power supply that charges the auxiliary capacitor C2.
  • the power supply Vcc may be a battery VB connected to the step-up capacitor C1 or may be a power supply different from the battery VB.
  • the power supply Vcc is different from the battery VB, the boosting capacitor C1 and the auxiliary capacitor C2 can be charged independently of each other, so that the charging time can be shortened.
  • the power supply Vcc is connected to the anode side of the diode D3.
  • the cathode side of the diode D3 is connected to the electrode on the high potential side of the auxiliary capacitor C2.
  • the auxiliary capacitor C2 may be composed of an electrolytic capacitor, for example, like the step-up capacitor C1.
  • the switching element T2 is composed of a transistor such as a MOSFET, and a freewheeling diode is connected to the transistor in antiparallel.
  • the electrode on the high potential side of the auxiliary capacitor C2 is connected to the cathode side of the diode D3 and is connected to the drive circuit 12 via the diode D4 of the conduction switching circuit 13.
  • the electrode on the low potential side of the auxiliary capacitor C2 is connected to the electrode on the drain side of the switching element T2, and is also connected to the electrode on the high potential side of the booster capacitor C1 via the switching element T1 of the conduction switching circuit 13. .. That is, the auxiliary capacitor C2 is connected in series with the switching element T1.
  • the electrode on the drain side of the switching element T2 is connected to the electrode on the low potential side of the auxiliary capacitor C2.
  • the electrode on the source side of the switching element T2 is connected to the ground.
  • the electrode on the gate side of the switching element T2 is connected to the control IC 15.
  • the charging voltage Vs of the auxiliary capacitor C2 is monitored by the control IC 15.
  • the control IC 15 controls the switching operation of the switching element T2 so that the charging voltage Vs of the auxiliary capacitor C2 reaches a predetermined target value when the auxiliary capacitor C2 is charged.
  • the target value of the charging voltage Vs of the auxiliary capacitor C2 is a value that can compensate for the decrease in the charging voltage Vp of the boosting capacitor C1 due to the proximity injection.
  • the switching element T2 performs a switching operation for switching whether or not to charge the auxiliary capacitor C2.
  • the switching element T2 When the switching element T2 is turned on, the electrode on the low potential side of the auxiliary capacitor C2 and the ground become conductive, and the charging voltage Vs of the auxiliary capacitor C2 rises.
  • the auxiliary capacitor C2 is charged by an arbitrary power supply voltage Vcc determined in advance based on a target value of the charging voltage Vs.
  • the switching element T2 is turned off, the electrode on the low potential side of the auxiliary capacitor C2 and the ground are in a non-conducting state, and the charging of the auxiliary capacitor C2 is stopped.
  • the continuity switching circuit 13 is a circuit that switches the boosting capacitor C1 and the auxiliary capacitor C2 into a conducting state or a non-conducting state.
  • the conduction switching circuit 13 includes a switching element T1, a diode D2, and a diode D4.
  • the switching element T1 is composed of a transistor such as a MOSFET, and a freewheeling diode is connected to the transistor in antiparallel.
  • the electrode on the drain side of the switching element T1 is branched and connected from between the electrode on the high potential side of the step-up capacitor C1 and the drive circuit 12. That is, the switching element T1 is connected in series with the step-up capacitor C1.
  • the electrode on the source side of the switching element T1 is branched and connected from between the electrode on the low potential side of the auxiliary capacitor C2 and the electrode on the drain side of the switching element T2.
  • the electrode on the gate side of the switching element T1 is connected to the control IC 15.
  • the step-up capacitor C1 and the auxiliary capacitor C2 are connected in series via the switching element T1.
  • the anode side of the diode D2 is connected to the drive circuit 12.
  • the anode side of the diode D2 is connected to the booster circuit 11.
  • the cathode side of the diode D2 is connected to the drive circuit 12.
  • the anode side of the diode D4 is connected to the electrode on the high potential side of the auxiliary capacitor C2.
  • the cathode side of the diode D4 is branched and connected from between the cathode side of the diode D2 and the drive circuit 12.
  • the switching element T1 performs a switching operation for switching the step-up capacitor C1 and the auxiliary capacitor C2 into a conductive state or a non-conducting state.
  • the switching operation of the switching element T1 is controlled by the control IC 15.
  • the step-up capacitor C1 and the auxiliary capacitor C2 are in a non-conducting state.
  • the charging voltage Vp of the boosting capacitor C1 is applied to the drive circuit 12, and the driving current is supplied from the charged boosting capacitor C1 to the drive circuit 12 via the diode D2.
  • the switching element T1 is turned on, the step-up capacitor C1 and the auxiliary capacitor C2 are in a conductive state.
  • a voltage corresponding to the sum of the charging voltage Vp of the boosting capacitor C1 and the charging voltage Vs of the auxiliary capacitor C2 is applied to the drive circuit 12, and the charged boosting capacitor C1 and the auxiliary capacitor C2 are passed through the switching element T1 and the diode D4.
  • a drive current is supplied to the drive circuit 12. That is, when the auxiliary capacitor C2 is switched to a conduction state with the boosting capacitor C1 by the switching element T1, the charging voltage Vs of the auxiliary capacitor C2 is applied to the drive circuit 12 together with the charging voltage Vp of the boosting capacitor C1.
  • FIG. 2 is a time chart illustrating the flow of control of the drive current in the injection control device 10 shown in FIG.
  • both the step-up capacitor C1 and the auxiliary capacitor C2 are in a state of being fully charged.
  • the switching element T2 Before the time point t1, the switching element T2 is ON. Before the time point t1, the switching element T1 is OFF, and the step-up capacitor C1 and the auxiliary capacitor C2 are in a non-conducting state.
  • FIG. 2 it is assumed that the step-up capacitor C1 has not been fully charged at the time point t4 at the start of driving the solenoid L2 for the second time (at the start of valve opening), and the injection device 1 performs proximity injection. I will do it.
  • the control IC 15 turns on the switching elements T4 and T6 at the time point t1 at the start of driving the solenoid L2 for the first time (at the start of valve opening). Since the switching element T1 is OFF, a drive voltage Vd corresponding to the charging voltage Vp of the boosting capacitor C1 is applied to the solenoid L2. A current is supplied to the solenoid L2 from the charged boosting capacitor C1 via the diode D2. That is, the drive circuit 12 supplies the peak current for opening the injection valve of the closed injection device 1 to the solenoid L2 of the injection device 1 as a drive current by the charging voltage Vp of the boosting capacitor C1. The charging voltage Vp of the boosting capacitor C1 is lowered by discharging. The drive voltage Vd applied to the solenoid L2 decreases as the charge voltage Vp of the step-up capacitor C1 decreases.
  • the control IC 15 turns off the switching element T4 at the time t2 when the peak current is supplied to the solenoid L2.
  • the injection valve of the injection device 1 composed of the solenoid L2 is opened to inject fuel.
  • the charging voltage Vp of the boosting capacitor C1 is charged from the boosting circuit 11 and rises.
  • the drive voltage Vd applied to the solenoid L2 increases as the charging voltage Vp of the boosting capacitor C1 increases.
  • the control IC 15 turns on the switching element provided in the constant current circuit at the time point t2.
  • a valve opening holding current is supplied to the solenoid L2 from the constant current circuit.
  • the injection valve of the injection device 1 composed of the solenoid L2 maintains the valve open state and continues to inject fuel.
  • the control IC 15 turns off the switching element T6 at the time point t3 when the time for the fuel injection amount from the injection device 1 configured by the solenoid L2 to reach the target value (holding time in the valve open state) has elapsed.
  • the solenoid L2 the supply of the valve opening holding current is stopped.
  • the injection valve of the injection device 1 configured by the solenoid L2 closes and stops the injection of fuel.
  • FIG. 2 the transition of the drive voltage Vd when the valve opening holding current is supplied is not shown.
  • the time point t4 at the start of driving the solenoid L2 for the second time is the time when the peak current is supplied to the solenoid L2 of the injection device 1.
  • the charging of the step-up capacitor C1 is not completed.
  • the state in which the charging of the boosting capacitor C1 is not completed is, for example, a state in which the charging voltage Vp of the boosting capacitor C1 is lower than the first threshold value Vpt based on the peak current.
  • the first threshold voltage Vpt is the voltage value obtained by subtracting the charging voltage Vs that can be compensated by the auxiliary capacitor C2 from the charging voltage Vp of the boosting capacitor C1 required for the drive voltage Vd corresponding to the peak current to be applied to the solenoid L2. May also be a large value.
  • the first threshold value Vpt may be, for example, a voltage value corresponding to 90% of the charging voltage Vp of the boosting capacitor C1 required for the drive voltage Vd corresponding to the peak current to be applied to the solenoid L2.
  • the control IC 15 turns on the switching element T1 and turns off the switching element T2 at the time point t4.
  • the step-up capacitor C1 and the auxiliary capacitor C2 are in a conductive state. That is, when the peak current is supplied to the solenoid L2 of the injection device 1, the switching element T1 together with the boosting capacitor C1 when the charging voltage Vp of the boosting capacitor C1 is lower than the first threshold value Vpt based on the peak current.
  • the auxiliary capacitor C2 is switched to the conductive state. Then, the control IC 15 turns on the switching elements T4 and T6 at the time point t4.
  • a drive voltage Vd corresponding to the sum of the charge voltage Vp of the boosting capacitor C1 and the charge voltage Vs of the auxiliary capacitor C2 is applied to the solenoid L2.
  • a drive current is supplied to the solenoid L2 from the charged boosting capacitor C1 and the auxiliary capacitor C2 via the switching element T1 and the diode D4.
  • the charging voltage Vp of the boosting capacitor C1 is lowered by discharging.
  • the charging voltage Vs of the auxiliary capacitor C2 decreases due to discharge.
  • the drive voltage Vd applied to the solenoid L2 decreases as the charging voltage Vp of the boosting capacitor C1 and the charging voltage Vs of the auxiliary capacitor C2 decrease.
  • the control IC 15 turns off the switching element T4 at the time t5 when the peak current is supplied to the solenoid L2.
  • the injection valve of the injection device 1 composed of the solenoid L2 is opened to inject fuel.
  • the control IC 15 turns off the switching element T1 and turns on the switching element T2 at the time point t5.
  • the step-up capacitor C1 and the auxiliary capacitor C2 are in a non-conducting state. That is, the switching element T1 switches the boosting capacitor C1 and the auxiliary capacitor C2 to the non-conducting state after the peak current is supplied to the solenoid L2 of the injection device 1.
  • the charging voltage Vp of the boosting capacitor C1 is charged from the boosting circuit 11 and rises.
  • the charging voltage Vs of the auxiliary capacitor C2 is charged from the power supply Vcc and rises.
  • the drive voltage Vd applied to the solenoid L2 increases as the charging voltage Vp of the boosting capacitor C1 increases.
  • the control IC 15 turns on the switching element provided in the constant current circuit and supplies the valve opening holding current from the constant current circuit to the solenoid L2 as in the time point t2.
  • the control IC 15 turns off the switching element T6 and stops the supply of the valve opening holding current at the time point t6, similarly to the time point t3.
  • the solenoid L2 of the injection device 1 is driven twice has been described as an example, but the injection control device 10 may also drive the other solenoids L3 to L5 three times or more. , It operates in the same manner as described in FIG.
  • the injection control device 10 of the first embodiment is an injection control device that controls the drive of the injection device 1 by controlling the drive current that drives the injection device 1 that injects fuel into the internal combustion engine.
  • the injection control device 10 includes a drive circuit 12 that applies a drive voltage Vd of the injection device 1 to supply a drive current to the injection device 1.
  • the injection control device 10 includes a boosting capacitor C1 that is charged by a boosted voltage boosted from the voltage of the battery VB based on the drive voltage Vd and applies the charging voltage Vp to the drive circuit 12.
  • the injection control device 10 is connected in series to the switching element T1 connected in series to the boosting capacitor C1 and charged by the voltage of an arbitrary power supply Vcc, and is an auxiliary to apply the charging voltage Vs to the drive circuit 12.
  • the switching element T1 switches the boosting capacitor C1 and the auxiliary capacitor C2 into a conductive state or a non-conducting state.
  • the auxiliary capacitor C2 is switched to a conduction state with the boosting capacitor C1 by the switching element T1, the charging voltage Vs of the auxiliary capacitor C2 is applied to the drive circuit 12 together with the charging voltage Vp of the boosting capacitor C1.
  • the injection control device 10 of the first embodiment when the charging voltage Vp of the boosting capacitor C1 is lower than the voltage at the time of completion of charging due to proximity injection or the like, the decrease of the charging voltage Vp is reduced by the charging voltage Vs of the auxiliary capacitor C2. Can be compensated by. Therefore, in the injection control device 10 of the first embodiment, the time until the drive current supplied to the solenoids L2 to L5 of the injection device 1 reaches the peak current (from the time point t4 to the time point t5) due to the decrease in the charging voltage Vp. It is possible to prevent the time) from becoming longer than usual. Therefore, the injection control device 10 of the first embodiment can suppress a decrease in the valve opening speed of the injection valve and suppress variations in the amount of fuel injected.
  • the injection control device 10 of the first embodiment when the charging voltage Vp of the boosting capacitor C1 does not drop from the voltage at the time of completion of charging due to proximity injection or the like, the switching element T1 is turned off, and the boosting capacitor C1 and the auxiliary capacitor C2 are used. Can be in a non-conducting state.
  • the injection control device 10 of the first embodiment may have a circuit configuration in which a switching element is not interposed between the step-up capacitor C1 and the drive circuit 12.
  • the injection control device 10 of the first embodiment in this case, the charging voltage Vp of the boosting capacitor C1 is lowered by the energy loss in the switching element, and the drive voltage Vd applied to the solenoids L2 to L5 of the injection device 1 is changed. It is possible to suppress the decrease. Therefore, the injection control device 10 of the first embodiment can suppress the decrease in energy efficiency, suppress the decrease in the valve opening speed of the injection valve, and suppress the variation in the amount of fuel injected.
  • the injection control device 10 of the first embodiment supplies the peak current for opening the injection valve of the injection device 1 closed by the drive circuit 12 to the solenoids L2 to L5 of the injection device 1 as a drive current.
  • the charging voltage Vp of the boosting capacitor C1 is lower than the first threshold Vpt based on the peak current when the peak current is supplied to the injection device 1, the switching element T1 uses the boosting capacitor C1 and the auxiliary capacitor C2. Switch to the conductive state.
  • the injection control device 10 of the first embodiment when the injection control device 10 of the first embodiment requires a large current called a peak current to open the injection valve of the closed injection device 1, the charging voltage Vp of the boosting capacitor C1 is insufficient. Even so, this can be reliably compensated by the auxiliary capacitor C2. Therefore, the injection control device 10 of the first embodiment can surely suppress the decrease in the valve opening speed of the injection valve and surely suppress the variation in the amount of fuel injected.
  • FIG. 3 is a time chart illustrating the flow of control of the drive current in the injection control device 10 of the second embodiment.
  • FIG. 3 corresponds to FIG.
  • the control IC 15 of the first embodiment turned off the switching element T1 and turned on the switching element T2 at the time point t5. That is, the control IC 15 of the first embodiment switches the boosting capacitor C1 and the auxiliary capacitor C2 to the non-conducting state at the time t5 when the peak current is supplied to the solenoids L2 to L5, and starts charging the auxiliary capacitor C2. ..
  • the switching element T1 is turned off, the switching element T2 is turned on, and the step-up capacitor C1 and the auxiliary capacitor C2 are not set after the time point t4 and before the time point t5. You may switch to the conduction state and start charging the auxiliary capacitor C2.
  • the control IC 15 of the second embodiment has the boost capacitor C1 and the auxiliary capacitor C2 when the charge voltage Vs of the auxiliary capacitor C2 is equal to or less than the second threshold voltage Vst based on the discharge end voltage of the auxiliary capacitor C2. And may be switched to the non-conducting state, and charging of the auxiliary capacitor C2 may be started. That is, in the switching element T1, when the boosting capacitor C1 and the auxiliary capacitor C2 are in a conductive state, the charging voltage Vs of the auxiliary capacitor C2 is the second threshold voltage Vst based on the discharge end voltage of the auxiliary capacitor C2. , The boosting capacitor C1 and the auxiliary capacitor C2 may be switched to the non-conducting state.
  • the discharge end voltage of the auxiliary capacitor C2 is the minimum value of the discharge voltage at which the auxiliary capacitor C2 can safely discharge.
  • the second threshold value Vst may be a voltage value obtained by adding a predetermined margin to the discharge end voltage of the auxiliary capacitor C2.
  • the second threshold value Vst may be, for example, a predetermined voltage value in which the charging voltage Vs of the auxiliary capacitor C2 is larger than 0V and within the range of 1V or less.
  • the control IC 15 of the second embodiment is a switching element even before the peak current is supplied to the solenoid L2 when the charging voltage Vs of the auxiliary capacitor C2 reaches the time point Ta when it becomes equal to or less than the second threshold value Vst.
  • T1 is turned off and the switching element T2 is turned on.
  • the boosting capacitor C1 and the auxiliary capacitor C2 are switched to the non-conducting state, and charging of the auxiliary capacitor C2 is started.
  • the injection control device 10 of the second embodiment can put the step-up capacitor C1 and the auxiliary capacitor C2 in a non-conducting state when the compensation effect of the auxiliary capacitor C2 is substantially eliminated.
  • the injection control device 10 of the second embodiment may have a circuit configuration in which a switching element is not interposed between the step-up capacitor C1 and the drive circuit 12. Therefore, in this case, since the injection control device 10 of the second embodiment covers the drive voltage Vd only by the charging voltage Vp of the boosting capacitor C1, it is possible to suppress the occurrence of energy loss in the switching element T1 and the auxiliary capacitor C2. Can be done. Therefore, the injection control device 10 of the second embodiment can suppress the decrease in energy efficiency, suppress the decrease in the valve opening speed of the injection valve, and suppress the variation in the amount of fuel injected.
  • FIG. 4 is a diagram illustrating the configuration of the injection control device 10 of the third embodiment.
  • FIG. 4 corresponds to FIG.
  • the auxiliary capacitor C2 of the first embodiment was charged by the voltage of the power supply Vcc.
  • the auxiliary capacitor C2 of the third embodiment may be charged by the boosted voltage boosted from the voltage of the battery VB by the booster circuit 11.
  • the electrode on the high potential side of the auxiliary capacitor C2 is connected to the cathode side of the diode D2, and the diode D3 and the power supply Vcc are excluded.
  • the diode D4 is excluded. Similar to the boosting capacitor C1, the auxiliary capacitor C2 is charged by the boosted voltage boosted from the battery voltage VB by the booster circuit 11.
  • the injection control device 10 of the third embodiment has the same effect as that of the first embodiment, and the number of elements can be reduced as compared with the first embodiment. That is, since the injection control device 10 of the third embodiment can reduce the number of elements, it is possible to reduce the size of the device and improve the energy efficiency as compared with the first embodiment.
  • FIG. 5 is a diagram illustrating the configuration of the injection control device 10 of the fourth embodiment.
  • FIG. 5 corresponds to FIG.
  • the electrode on the low potential side of the auxiliary capacitor C2 is connected to the electrode on the high potential side of the step-up capacitor C1 via the switching element T1.
  • the electrode on the high potential side of the auxiliary capacitor C2 may be connected to the electrode on the low potential side of the step-up capacitor C1 via the switching element T11.
  • the diode D3 is excluded from the auxiliary charging circuit 14 of the fourth embodiment.
  • the conduction switching circuit 13 of the fourth embodiment includes the switching element T11 instead of the switching element T1 and newly includes the switching element T12, and the diode D2 and the diode D4 are excluded.
  • the switching element T11 performs a switching operation of switching between the conductive state and the non-conducting state of the boosting capacitor C1 and the auxiliary capacitor C2.
  • the switching element T12 performs a switching operation for switching whether or not to charge the step-up capacitor C1.
  • the switching element T12 is turned on, the electrode on the low potential side of the boosting capacitor C1 and the ground become conductive, and the charging voltage Vp of the boosting capacitor C1 rises.
  • the switching element T12 is turned off, the electrode on the low potential side of the step-up capacitor C1 and the ground are in a non-conducting state, and the charging of the step-up capacitor C1 is stopped.
  • the injection control device 10 of the fourth embodiment includes another switching element T12 different from the switching elements T1 and T11. Then, the electrode on the high potential side of the step-up capacitor C1 is connected to the drive circuit 12. The electrode on the low potential side of the step-up capacitor C1 is connected to the electrode on the high potential side of the auxiliary capacitor C2 via the switching element T11. The electrode on the low potential side of the auxiliary capacitor C2 is connected to the ground.
  • the other switching elements T12 different from the switching elements T1 and T11 are branched and connected from between the electrode on the low potential side of the step-up capacitor C1 and the switching element T11, and the low potential of the auxiliary capacitor C2 is connected via the ground. Connected to the side electrode.
  • the electrode on the low potential side of the boosting capacitor C1 is connected to the electrode on the drain side of the switching element T12 and is connected to the electrode on the source side of the switching element T11.
  • the electrode on the source side of the switching element T12 is connected to the ground.
  • the electrode on the gate side of the switching element T12 is connected to the control IC 15.
  • the electrode on the drain side of the switching element T11 is connected to the electrode on the high potential side of the auxiliary capacitor C2, and is also connected to the electrode on the source side of the switching element T2.
  • the electrode on the gate side of the switching element T11 is connected to the control IC 15.
  • the electrode on the low potential side of the auxiliary capacitor C2 is connected to the ground.
  • the electrode on the drain side of the switching element T2 is connected to the power supply Vcc.
  • the electrode on the gate side of the switching element T2 is connected to the control IC 15.
  • FIG. 6 is a time chart illustrating a flow of control of the drive current in the injection control device 10 shown in FIG. FIG. 6 corresponds to FIG.
  • the control IC 15 of the fourth embodiment controls the switching operation of the switching element T11 in the same manner as the switching element T1 of the first embodiment.
  • the control IC 15 of the fourth embodiment controls the switching operation of the switching element T12 in the same manner as the switching element T2 of the first and fourth embodiments.
  • control IC 15 of the fourth embodiment turns off the switching element T11 and turns on the switching elements T2 and T12 before the time point t1.
  • both the step-up capacitor C1 and the auxiliary capacitor C2 are in a fully charged state.
  • the control IC 15 of the fourth embodiment turns on the switching element T11 and turns off the switching elements T2 and T12 at the time point t4.
  • the booster capacitor C1 and the auxiliary capacitor C2 are in a conductive state, and a drive voltage Vd corresponding to the sum of the charge voltage Vp of the booster capacitor C1 and the charge voltage Vs of the auxiliary capacitor C2 is applied to the solenoid L2. ..
  • the control IC 15 of the fourth embodiment turns off the switching element T11 and turns on the switching elements T2 and T12 at the time point t5.
  • the booster capacitor C1 and the auxiliary capacitor C2 are in a non-conducting state, and the charging voltage Vp of the booster capacitor C1 is charged by the booster circuit 11 and rises.
  • the charging voltage Vs of the auxiliary capacitor C2 is charged by the power supply Vcc and rises.
  • the injection control device 10 of the fourth embodiment has the same effect as that of the first embodiment, and the number of elements can be reduced as compared with the fourth embodiment. That is, since the injection control device 10 of the fourth embodiment can reduce the number of elements, it is possible to reduce the size of the device and improve the energy efficiency as compared with the fourth embodiment.
  • the present invention is not limited to the above embodiment, and includes various modifications.
  • the above-described embodiment has been described in detail in order to explain the present invention in an easy-to-understand manner, and is not necessarily limited to the one including all the described configurations.
  • it is possible to replace a part of the configuration of one embodiment with the configuration of another embodiment and it is also possible to add the configuration of another embodiment to the configuration of one embodiment.
  • each of the above configurations, functions, processing units, processing means, etc. may be realized by hardware by designing a part or all of them by, for example, an integrated circuit. Further, each of the above configurations, functions, and the like may be realized by software by the processor interpreting and executing a program that realizes each function. Information such as programs, tapes, and files that realize each function can be placed in a memory, a recording device such as a hard disk or SSD (solid state drive), or a recording medium such as an IC card, SD card, or DVD.
  • a recording device such as a hard disk or SSD (solid state drive)
  • a recording medium such as an IC card, SD card, or DVD.
  • control lines and information lines indicate those that are considered necessary for explanation, and do not necessarily indicate all control lines and information lines in the product. In practice, it can be considered that almost all configurations are interconnected.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

L'objectif de la présente invention est de commander une baisse de la vitesse d'ouverture de soupape de soupapes d'injection afin de réguler les fluctuations de la quantité de carburant injecté. Un dispositif de commande d'injection (10) comprend un circuit d'attaque (12) qui fournit un courant d'attaque à un dispositif d'injection (1) ; un condensateur de suralimentation (C1) qui est connecté au circuit d'attaque (12), est chargé sur la base d'une tension d'attaque (Vd) par une tension d'élévation à partir de la tension d'une batterie (VB), et applique une tension de charge (Vp) au circuit d'attaque (12) ; un élément de commutation (T1) qui est connecté en série au condensateur de suralimentation (C1) ; et un condensateur auxiliaire (C2) qui est connecté en série à l'élément de commutation (T1), est chargé par la tension d'une source d'alimentation arbitraire (Vcc), et applique une tension de charge (Vs) au circuit d'attaque (12). L'élément de commutation (T1) commute entre un état conducteur et un état non conducteur pour le condensateur d'amplification (C1) et le condensateur auxiliaire (C2). Le condensateur auxiliaire (C2), lorsqu'il est commuté dans l'état conducteur avec le condensateur de suralimentation (C1), applique la tension de charge (Vs) du condensateur auxiliaire (C2), avec la tension de charge (Vp) du condensateur d'amplification (C1), au circuit d'attaque (12).
PCT/JP2021/018725 2020-09-03 2021-05-18 Dispositif de commande d'injection WO2022049838A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2022546891A JP7307860B2 (ja) 2020-09-03 2021-05-18 噴射制御装置

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2020148169 2020-09-03
JP2020-148169 2020-09-03

Publications (1)

Publication Number Publication Date
WO2022049838A1 true WO2022049838A1 (fr) 2022-03-10

Family

ID=80491004

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2021/018725 WO2022049838A1 (fr) 2020-09-03 2021-05-18 Dispositif de commande d'injection

Country Status (2)

Country Link
JP (1) JP7307860B2 (fr)
WO (1) WO2022049838A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0654657U (ja) * 1992-12-29 1994-07-26 旭光学工業株式会社 用紙搬送機構
JP2003161193A (ja) * 2001-11-27 2003-06-06 Hitachi Ltd 自動車のインジェクタ駆動用昇圧回路
JP2014066196A (ja) * 2012-09-26 2014-04-17 Honda Motor Co Ltd 電磁弁駆動装置
JP2015169112A (ja) * 2014-03-06 2015-09-28 株式会社デンソー 噴射制御装置
JP2019100220A (ja) * 2017-11-30 2019-06-24 日立オートモティブシステムズ株式会社 電磁弁の制御装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0651657U (ja) * 1992-12-23 1994-07-15 株式会社堀場製作所 電磁石応用装置駆動回路
JPH1153038A (ja) * 1997-08-06 1999-02-26 Toyota Motor Corp アクチュエータ駆動回路
JP2002237410A (ja) * 2001-02-08 2002-08-23 Denso Corp 電磁弁駆動回路
JP2002364768A (ja) * 2001-06-07 2002-12-18 Denso Corp 電磁弁駆動装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0654657U (ja) * 1992-12-29 1994-07-26 旭光学工業株式会社 用紙搬送機構
JP2003161193A (ja) * 2001-11-27 2003-06-06 Hitachi Ltd 自動車のインジェクタ駆動用昇圧回路
JP2014066196A (ja) * 2012-09-26 2014-04-17 Honda Motor Co Ltd 電磁弁駆動装置
JP2015169112A (ja) * 2014-03-06 2015-09-28 株式会社デンソー 噴射制御装置
JP2019100220A (ja) * 2017-11-30 2019-06-24 日立オートモティブシステムズ株式会社 電磁弁の制御装置

Also Published As

Publication number Publication date
JP7307860B2 (ja) 2023-07-12
JPWO2022049838A1 (fr) 2022-03-10

Similar Documents

Publication Publication Date Title
KR100284521B1 (ko) 한 개 이상의 전자적 부하 제어장치
US7349193B2 (en) Solenoid driver with high-voltage boost and reverse current capability
US20110220069A1 (en) Injector Drive Circuit
US7823860B2 (en) Drive of an electromagnetic valve with a coil by supplying high voltage from a discharging capacitor to the coil
US5936827A (en) Device for controlling at least one electromagnetic load
WO2022049838A1 (fr) Dispositif de commande d'injection
JP5991213B2 (ja) インジェクタ駆動装置
US20190323447A1 (en) Injection control device
US10446235B2 (en) Method for writing in an EEPROM memory and corresponding device
JP7135809B2 (ja) 噴射制御装置
CN209389936U (zh) 一种电磁阀驱动用的Boost快速升压电路
CN113137314B (zh) 电磁阀驱动装置
JP7111053B2 (ja) 燃料噴射弁駆動装置
CN110620509B (zh) 开关模式功率变换器
US11428182B2 (en) Method for controlling a high-pressure fuel injector
US20040208042A1 (en) Power output stage for capacitive loads
JPH11224816A (ja) 電磁的負荷の制御方法および制御装置
JP2017046382A (ja) 電磁デバイス駆動装置
JP6488770B2 (ja) 燃料噴射制御装置
US11391233B2 (en) Method for controlling a high-pressure fuel injector
JP2022014155A (ja) 誘導性負荷駆動装置
KR20230091220A (ko) 전압 스위칭을 통한 인젝터 제어 장치 및 방법
JP2002021680A (ja) 燃料噴射弁駆動方法
JP2017101588A (ja) 電磁デバイス駆動装置
JP5582095B2 (ja) インジェクタ駆動装置

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 21863897

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2022546891

Country of ref document: JP

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 21863897

Country of ref document: EP

Kind code of ref document: A1