JP6446340B2 - Electromagnetic device driving apparatus and vehicle - Google Patents

Description

The present invention relates to an electromagnetic device driving apparatus including a booster circuit and a vehicle including the electromagnetic device driving apparatus , and more particularly to shortening a charging time of an output capacitor of the boosting circuit and shortening a recovery time to a predetermined boosted voltage. The present invention relates to an electromagnetic device driving apparatus capable of operating and a vehicle including the electromagnetic device driving apparatus .

  Conventionally, as an electromagnetic device driving device having a circuit for regenerating the back electromotive force of an electromagnetic device driven by a boost power supply to an output capacitor of the boost power supply, a ground side terminal of a solenoid actuator that opens and closes a fuel injection valve that is the electromagnetic device There is known an “internal combustion engine control device” in which the anode of a regenerative diode is connected to the cathode and the cathode of the diode is connected to the voltage output terminal of the output capacitor (see Patent Document 1).

  FIG. 2 is a diagram showing a part of the internal combustion engine control device described in Patent Document 1. As shown in FIG. When starting the fuel injection period, the control circuit 210 turns on TR202 and TR204 so as to apply a high voltage from the booster circuit 201 to the INJ 205 to quickly open the fuel injection valve. After a predetermined time has elapsed, TR202 is turned off, and TR206 is turned on / off to hold the valve open state. Thereafter, when the fuel injection period ends, TR206 and TR204 are turned off to stop energization to INJ205.

  A current flowing through the INJ 205 due to the back electromotive voltage generated in the INJ 205 after the energization is stopped flows into the booster circuit 201 through the diode D207 and the resistor R208 and is regenerated in the booster circuit 201. Thereby, for example, a boost power supply capacitor (not shown) provided in the output circuit of the booster circuit 201 is charged.

  Such a regenerative circuit has the effect of reducing power consumption by effectively utilizing the back electromotive force of an electromagnetic device (actuator in the above example), as well as a booster circuit in which the output voltage (terminal voltage) has decreased once discharged. The output capacitor is charged by the booster circuit itself and also charged through the regenerative circuit, so that the time required for the output voltage to recover (recover) to the predetermined boosted voltage is shortened.

  However, in the conventional control device described above, regeneration to the output capacitor is performed only when the solenoid is shut off, so there is a limit to shortening the time until the output voltage of the booster circuit recovers. is there.

  On the other hand, in particular, in a diesel engine, it is known that combustion performance is improved by performing multi-stage injection in which fuel is injected in a plurality of times in one combustion cycle. In order to perform a desired number of fuel injections, it is necessary to shorten the charging time of the output capacitor of the booster circuit to shorten the fuel injection interval.

Japanese Patent No. 4474423

  From the above background, in an electromagnetic device driving apparatus provided with a booster circuit, it is desired to shorten the recovery time to a predetermined boosted voltage by shortening the charging time of the output capacitor of the booster circuit.

One aspect of the present invention includes a booster circuit including an output capacitor, a first drive circuit that drives a first electromagnetic device by energizing a boosted voltage output from the output capacitor, and a second electromagnetic device. A second drive circuit for operating a second electromagnetic device not connected to the booster circuit by turning on and off a first switch provided between one end of the second electromagnetic device and a ground line A first regenerative diode having an anode connected to the one end of the second electromagnetic device, a cathode connected to an output end of the boosted voltage of the output capacitor, and the one end of the second electromagnetic device. A constant voltage diode having a cathode connected thereto and an anode connected to a wiring line having a ground potential when the first switch is turned off. A device drive.
According to another aspect of the present invention, the breakdown voltage of the constant voltage diode is set to a value obtained by adding a forward voltage of the regenerative diode to a predetermined output voltage of the booster circuit.
According to another aspect of the invention, the first switch is a MOSFET, and the cathode and anode of the constant voltage diode are connected to the drain and gate of the MOSFET, respectively.
According to another aspect of the present invention, the first drive circuit includes a second switch provided between the other end of the first electromagnetic device and a ground line, and the first electromagnetic device includes: A second regenerative diode having an anode connected to the other end and a cathode connected to an output terminal of the boosted voltage of the output capacitor;
According to another aspect of the invention, the first electromagnetic device is a solenoid actuator that opens and closes a fuel injection valve of an internal combustion engine.
Another aspect of the present invention is a vehicle electronic control device including any one of the electromagnetic device driving devices.
Still another aspect of the present invention is a vehicle including any one of the above-described electromagnetic device driving apparatuses.

It is an electric circuit diagram of the electromagnetic device drive device concerning one embodiment of the present invention. It is a figure which shows an example of the conventional solenoid valve control circuit.

  Embodiments of the present invention will be described below with reference to the drawings. The electromagnetic device driving apparatus according to the present embodiment is an electromagnetic device driving apparatus that is mounted on, for example, a vehicle and drives a solenoid actuator that opens and closes a fuel injection valve of an internal combustion engine of the vehicle as an electromagnetic device. However, the present invention is not limited to this, and can be widely applied to a drive device that drives a general electromagnetic device (or inductive load).

FIG. 1 is a circuit diagram of an electromagnetic device driving apparatus according to an embodiment of the present invention.
The driving apparatus 10 receives a power supply from a battery (not shown) and outputs a predetermined boosted voltage larger than the power supply voltage (power supply voltage) V _BAT , and a boosted voltage output from the booster circuit 100. The first control circuit 104 that drives the first electromagnetic device L102 in response to supply of the second electromagnetic device L106 and the second electromagnetic device L106 that receives power from the battery and is different from the boosted voltage (for example, the power supply voltage V _BAT ). And a second control circuit 108 to be driven. Here, the 1st electromagnetic device L102 is a solenoid actuator which controls the fuel injection valve (not shown) of the internal combustion engine of the vehicle by which this drive device 10 is mounted, for example.

Boosting circuit 100 includes a coil L110 of which one end is connected to the supply line of the voltage V _BAT, and Tr112 are switches for turning on or off the energization of provided to the coil L110 between the other end and a ground line of the coil L110 The diode D114 whose anode is connected to the other end of the coil L110, the output capacitor C116 that is charged by the current flowing out of the coil L110 through the diode D114 and outputs a predetermined boosted voltage, and the TR112 are turned on and off to boost the operation. And a boost control circuit 118 for controlling the.

The first control circuit 104 selectively supplies the output voltage from the booster circuit 100 and the power supply voltage V _BAT from the battery to one end of the first electromagnetic device L102 via Tr120 and Tr122, respectively. The other end of one electromagnetic device L102 is connected to the ground line via Tr124. Tr 120 and 122 are, for example, p-channel MOSFETs, and Tr 124 is, for example, an n-channel MOSFET. Tr124 corresponds to the second switch.

  On / off of the Trs 120 to 124 is controlled by an injection control circuit 126 for controlling the operation of the first electromagnetic device L102 which is an actuator for opening and closing the fuel injection valve. When the fuel injection valve is opened, the injection control circuit 126 turns on Tr120 and Tr124 while keeping Tr122 off, and causes a large current to flow through the first electromagnetic device L102 by the output voltage (boosted voltage) from the booster circuit 100. Then, the injection valve is immediately opened, and thereafter, Tr120 is turned off and Tr122 is turned on and off repeatedly to maintain the injection valve in the open state. Thereafter, when a predetermined fuel injection time elapses, the injection control circuit 126 turns off Tr122 and Tr124 to cut off the energization of the first electromagnetic device L102.

  The diode D128 is a flywheel diode for causing a back electromotive current to flow through the first electromagnetic device L102 at the moment when the Tr 122 is turned off when the Tr 122 is turned on and off to maintain the valve open state.

The second control circuit 108 connects one end of the second electromagnetic device L106 to another power source different from the step-up circuit (step-up power source) 100, for example, a power source line of a battery (power supply voltage V _BAT ). The other end of the electromagnetic device L106 is connected to the ground line via Tr130. In addition, the second control circuit 108 includes a load control circuit 136 that turns on and off the Tr 130 via the Tr 132 and Tr 134 that constitute a push-pull circuit. In addition, the first electromagnetic device L102 of the connection point (point A in the drawing) between the second electromagnetic device L106 and the first switch Tr130 and the output capacitor C116 of the booster circuit 100 in the second control circuit 108. A regenerative diode D140 for regenerating the back electromotive force of the second electromagnetic device L106 to the output capacitor C116 (anode at the A point in the figure) between the line (point B in the figure) connected to the end of the power feeding side , A cathode is connected to point B in the figure).

  Further, in the electromagnetic device driving apparatus 10, the anode of the regenerative diode D140, the second electromagnetic device L106, the connection point (point A in the figure), and the Tr130 that becomes the ground potential when the first switch Tr130 is turned off. A zener diode (constant voltage diode) D142 is provided between the gate line (point C in the drawing) (the cathode and anode of D142 are connected to the points A and C, respectively).

In the electromagnetic device driving apparatus 10 having the above-described configuration, the first switch for energizing the second electromagnetic device L106 driven by another power source different from the booster circuit 100 (for example, a battery that supplies the voltage V _BAT ). The counter electromotive force that is controlled by the Tr 130 and is generated in the second electromagnetic device L106 by turning off the Tr 130 that is the first switch is regenerated to the output capacitor C116 of the booster circuit 100 via the regenerative diode D140. The Here, as described above, since the second electromagnetic device L106 is a device different from the first electromagnetic device L102 that opens and closes the fuel injection valve, the first electromagnetic device that is turned off only at the end of the fuel injection period. The second electromagnetic device L106 can be turned on / off more frequently than L102. As a result, compared with the conventional control device in which energy is regenerated to the output capacitor of the booster circuit only at the end of the fuel injection period, the energy regeneration frequency to the output capacitor C116 is increased and the return time to the predetermined boosted voltage is shortened. can do.

  Further, in the electromagnetic device driving apparatus 10, since the Zener diode D142 is provided between the anode side (point A in the figure) of the regenerative diode D140 and the wiring line (point C in the figure) that becomes the ground potential at the time of regeneration, By setting the breakdown voltage of the Zener diode D142 to a value (eg, 43V) obtained by adding the forward voltage (eg, 3V) of the regenerative diode D140 to a predetermined boosted voltage value (eg, 40V) of the output capacitor C116, the output capacitor C116 It is possible to prevent the battery from being charged beyond a predetermined boosted voltage. As a result, it is possible to prevent the Tr 120 and the first electromagnetic device L102 from being damaged due to an excessive voltage output from the output capacitor C116.

  In the present embodiment, only the back electromotive force from the electromagnetic device L106 driven by the second control circuit 108 is regenerated to the output capacitor C116 via the diode D140. A regenerative diode is added between a connection line (point D in the figure) between the first electromagnetic device L102 and the transistor Tr124 as the second switch and a line (point B in the figure) connected to the output terminal of the output capacitor C116 (point B in the figure) ( The back electromotive force of the first electromagnetic device L102 driven by the first control circuit 104 may also be regenerated to the output capacitor C116.

  DESCRIPTION OF SYMBOLS 10 ... Electromagnetic device drive device, 100 ... Boost circuit, L102 ... 1st electromagnetic output device, 104 ... 1st control circuit, L106 ... 2nd electromagnetic device, 108 ... Second control circuit, L110 ... coil, Tr112, Tr120, Tr122, Tr124, Tr130, Tr132, Tr134 ... transistor, D114, D128, D140 ... diode, C116 ... output capacitor, 118 ... Boost control circuit, 126... Injection control circuit, 136... Load control circuit.

Claims (7)

A booster circuit comprising an output capacitor;
A first drive circuit for energizing the boosted voltage output from the output capacitor to drive the first electromagnetic device;
A second electromagnetic device that is not driven by the boosted voltage is operated by turning on / off a first switch provided between one end of the second electromagnetic device and a ground line. A second drive circuit for causing
A first regenerative diode having an anode connected to the one end of the second electromagnetic device and a cathode connected to the output end of the boosted voltage of the output capacitor;
A constant voltage diode having a cathode connected to the one end of the second electromagnetic device, and an anode connected to a wiring line that becomes a ground potential when the first switch is turned off;
An electromagnetic device driving apparatus comprising: The breakdown voltage of the constant voltage diode is set to a value obtained by adding a forward voltage of the regenerative diode to a predetermined output voltage of the booster circuit.
The electromagnetic device driving apparatus according to claim 1. The first switch is a MOSFET, and a cathode and an anode of the constant voltage diode are connected to a drain and a gate of the MOSFET, respectively.
The electromagnetic device driving apparatus according to claim 2. The first drive circuit includes a second switch provided between the other end of the first electromagnetic device and a ground line,
A second regenerative diode having an anode connected to the other end of the first electromagnetic device and a cathode connected to an output end of the boosted voltage of the output capacitor;
The electromagnetic device driving apparatus according to any one of claims 1 to 3. The first electromagnetic device is a solenoid actuator that opens and closes a fuel injection valve of an internal combustion engine.
The electromagnetic device drive apparatus as described in any one of Claims 1 thru | or 4.   An electronic control device for a vehicle comprising the electromagnetic device driving device according to any one of claims 1 to 5.   A vehicle comprising the electromagnetic device driving apparatus according to any one of claims 1 to 5.

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