JP2017137908A - Solenoid valve control device and electromagnetic fuel injection valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve controllability of a fuel injection amount by shortening an operation time and a bounce time in closing a solenoid valve as a fuel injection valve.SOLUTION: There is provided a solenoid valve control device 100 for controlling a solenoid valve 170 constituted so that electromagnetic force is selectively generated in two directions opposed to each other with respect to a valve element 212, which includes an energization control circuit 158 for controlling energization to the solenoid valve in moving the valve element from a valve opening position to a valve closing position. The energization control circuit controls applied voltage or energization voltage to the solenoid valve in accordance with a prescribed time change pattern on voltage or current, and the prescribed time change pattern includes application of first voltage to the solenoid valve or energization of first current to the solenoid valve so that electromagnetic force from the valve opening position toward the valve closing position is energized to the valve element.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an electromagnetic valve control device that controls the operation of an electromagnetic valve that controls fuel injection into a cylinder in an internal combustion engine, and an electromagnetic fuel injection valve that is an electromagnetic valve controlled by the device, and in particular, a valve closing operation. Valve control apparatus capable of accurately controlling the fuel injection amount from the valve opening to the valve closing by appropriately controlling the movement of the valve body in the valve, and the electromagnetic fuel injection valve which is an electromagnetic valve controlled by the apparatus About.

  In order to control the operation of the internal combustion engine, it is necessary to accurately control the fuel injection amount in the internal combustion engine. Such control of the fuel injection amount is conventionally performed by controlling the voltage application time to the solenoid valve which is a fuel injection valve. In this case, in the valve closing operation in which the solenoid valve is shifted from the open state to the closed state, the energization current of the solenoid valve decreases after the voltage application is completed, and the valve body of the solenoid valve is moved from the open position to the closed position. The actual fuel injection amount is a voltage applied based on the time required for the valve body to move to the position and the period when the valve body collides with the seat (or stopper) that defines the valve closing position and repeats bouncing (bounce period). It can be greater than the amount of injection calculated from the time.

  FIG. 7 is a diagram showing an example of the operation of the solenoid valve in the solenoid valve control according to the prior art. FIGS. 7A, 7B, and 7C are respectively the time change of the voltage applied to the solenoid valve (shown by line 700) and the time change of the current flowing through the solenoid valve (energization current) (line). 702) and the time variation (indicated by line 704) of the lift amount of the valve body of the solenoid valve (that is, the amount of movement from the valve closing position to the valve opening position). In each figure, the horizontal axis indicates time.

When voltage V _U is applied to the solenoid valve at time t _m1 (FIG. 7 (a)), at time t _m2 when the time until the current flowing through the solenoid valve reaches the current required for moving the valve body has elapsed, The valve body starts moving from the valve closing position toward the valve opening position (FIG. 7C). Thereafter, when a voltage V _B smaller than the voltage V _U is applied to the solenoid valve at time t _m3 when a sufficient time has elapsed for the valve element to reach the valve open position (FIG. 7A), the solenoid valve is energized. The current drops to a current value sufficient to maintain the valve open state (FIG. 7 (b)), and the valve body is maintained in the valve open position (FIG. 7 (c)). Then, when voltage application to the solenoid valve is stopped at time t _m4 when the fuel injection of a predetermined amount is completed (FIG. 7A), the energization current starts to decrease toward zero (FIG. 7B). .

At this time, due to the back electromotive force generated in the coil of the solenoid valve, the energization current does not immediately become zero, but decreases with a time constant determined by the inductance, winding resistance, etc. of the coil. For this reason, the magnetic field generated in the coil of the solenoid valve also decreases with a time constant, and a corresponding time (from time t _m4 when voltage application is stopped to time t _m5 when the valve body reaches the valve closing position) (Valve travel time) occurs (FIG. 7C).

In addition, after the time t _m5 when the valve body reaches the valve closing position, the valve body may collide with the seat (or stopper portion) that defines the valve closing position and repeatedly bounce, and the bounce period ( At time t _m6 when the bounce period) ends, the valve body finally stops stably at the valve closing position. As a result, as described above, a valve body movement time t _m4 ~t _m5, the bounce period t _m5 ~t _m6, the actual fuel injection quantity can become more than the injection amount calculated from the voltage application time .

  Conventionally, as a technique for shortening the delay time from the shut-off of the valve opening current to the valve closing state in an electromagnetic fuel injection valve (hereinafter also referred to as a fuel injection valve), a valve opening coil, a valve opening holding coil, The valve closing coil and the spring that biases the valve body in the valve closing direction constitute a fuel injection valve. When the valve is closed, the valve closing coil is energized to generate the magnetic flux generated in the valve opening holding coil. An electromagnetic fuel injection device that shortens the valve closing delay time by quickly reducing the electromagnetic force that tries to hold the valve body in the valve open position by quickly canceling the valve is known (Patent Document 1).

  As another technique for shortening the time required for moving the valve body when the fuel injection valve is closed, an H bridge circuit is used to reversely reverse the current flowing through the solenoid valve when the valve is closed, thereby reversely injecting the fuel injection. An injector drive circuit that improves responsiveness when a valve is closed to shorten the valve closing delay time is known (Patent Document 2).

  However, all of the above conventional techniques reduce the time required for moving the valve body by shortening the time from the end of energization for maintaining the valve opening until the disappearance of the magnetic field. Has its limits. That is, in the above-described conventional technique, it is not possible to shorten the valve body movement time beyond the limit time determined by the strength of the spring that biases the valve body to the valve closing position in the electromagnetic valve. This limit time can be shortened, for example, by increasing the strength of the spring, but the voltage necessary for opening the valve increases as the spring strength increases, which is not a good idea.

  In the above-described conventional technology, the bounce period is determined solely by the mechanical design of the solenoid valve (spring strength, elastic coefficient between the valve body and the seat, etc.), and the bounce period is shortened by controlling the energization of the solenoid valve. It is difficult.

JP 2000-265920 A JP 2008-69639 A

  From the above background, in the control of a solenoid valve that is a fuel injection valve, control of the fuel injection amount is achieved by shortening the valve body movement time (or valve body movement period) and bounce time in the operation when the solenoid valve is closed. It is desired to improve accuracy.

One aspect of the present invention is an electromagnetic valve control device that controls an electromagnetic valve configured to selectively generate an electromagnetic force in two directions opposite to a valve body. The electromagnetic valve control device includes an energization control circuit that controls energization of the electromagnetic valve when the valve body is moved from the valve opening position to the valve closing position, and the energization control circuit is configured to perform predetermined voltage or current In accordance with the time change pattern, the applied voltage or the energization current to the electromagnetic valve is controlled, and the predetermined time change pattern biases the electromagnetic force from the valve opening position to the valve closing position on the valve body. Applying a first voltage to the solenoid valve or passing a first current through the solenoid valve.
According to another aspect of the present invention, the predetermined time change pattern is applied to the electromagnetic valve so that the moving acceleration or moving speed of the valve body decreases before the valve body reaches the valve closing position. The second voltage is a voltage having an absolute value smaller than that of the first voltage or having a polarity reversed with respect to the first voltage, The current No. 2 is a current having an absolute value smaller than that of the first current or having a conduction direction reversed with respect to the first current.
According to another aspect of the present invention, the predetermined time change pattern further includes gradually changing the second voltage or the second current to zero along a predetermined change line.
According to another aspect of the invention, the solenoid valve is a fuel injection valve that controls fuel injection into the internal combustion engine.
Another aspect of the present invention is an electromagnetic fuel injection valve, the electromagnetic fuel injection valve including at least one hollow coil, a plunger movably disposed in a hollow portion of the coil, and the plunger. The plunger is a magnet magnetized in a movable direction, and an electromagnetic force is selectively applied in two directions opposite to the valve body by energizing at least one of the coils. Is configured to generate.
According to another aspect of the present invention, the electromagnetic fuel injection valve is a fuel injection valve that is provided in an internal combustion engine and controls fuel injection into the internal combustion engine.

It is a figure which shows an example of a structure of the solenoid valve control apparatus which concerns on one Embodiment of this invention. It is a figure which shows an example of a structure of the electromagnetic fuel injection valve which is a solenoid valve controlled by the solenoid valve control apparatus shown in FIG. It is a figure which shows an example of the predetermined voltage pattern used when the solenoid valve control apparatus shown in FIG. 1 controls valve closing operation. It is a figure for demonstrating the operation | movement at the time of valve closing of the solenoid valve controlled by the solenoid valve control apparatus shown in FIG. It is a figure which shows the other example of the predetermined voltage pattern which the solenoid valve control apparatus shown in FIG. 1 uses. It is a figure which shows the other example of the drive circuit of a solenoid valve. It is the figure which showed an example of operation | movement of the solenoid valve in the solenoid valve control according to a prior art.

  Embodiments of the present invention will be described below with reference to the drawings. The electromagnetic valve control device according to the present embodiment is mounted on a vehicle (hereinafter referred to as a host vehicle), and can be configured as, for example, an electronic control unit (ECU, Electronic Control Unit) that controls the operation of the host vehicle. In this embodiment, the electromagnetic valve control device is configured as a single device. However, the present invention is not limited to this, and as a part of other devices (for example, a part of ECU that controls the operation of the internal combustion engine). It can also be configured. In addition, the electromagnetic valve control device according to the present embodiment controls the operation of an electromagnetic fuel injection valve that is an electromagnetic valve that controls fuel injection into the cylinder of the internal combustion engine of the host vehicle. The present invention can be applied not only to a general solenoid valve (or solenoid valve, solenoid valve) but also to a solenoid valve control device that controls the operation of a general solenoid valve.

FIG. 1 is a diagram showing a configuration of a solenoid valve control device according to an embodiment of the present invention.
The electromagnetic valve control apparatus 100 controls the operation of an electromagnetic fuel injection valve 170 (hereinafter referred to as an electromagnetic valve 170) to control fuel injection into a cylinder (not shown) of an internal combustion engine. In particular, the electromagnetic valve 170 controlled by the electromagnetic valve control device 100 has two directions opposite to the valve body (more specifically, from the valve closing position to the valve opening position and from the valve opening position). The electromagnetic force is selectively generated in the direction toward the valve closing position.

  FIG. 2 is a cross-sectional view showing an example of the configuration of the electromagnetic valve 170. The electromagnetic valve 170 includes a substantially cylindrical casing 200 and a cap 202 disposed on the upper portion of the casing 200 in the figure. The cap 202 is provided with a fuel supply opening 204, and a fuel injection opening 206 is provided at the lower end of the casing 200 in the figure. An inner bottom surface of the fuel injection opening 206 (a portion of the fuel injection opening 206 on the inner bottom surface of the housing 200) constitutes a seat (or stopper portion) 214 that defines a valve closing position of a valve body 212 described later.

  The casing 200 is provided with a cavity 208 along the axial direction of the casing 200 (the vertical direction in the figure). Inside the cavity 208, a plunger 210 is disposed in the cavity 208 in the vertical direction in the figure. It is arranged to be movable along.

  The plunger 210 is, for example, a magnet whose upper end and lower end in the figure are magnetized to N and S poles, respectively, and a non-magnetic valve body 212 is connected and fixed to the lower end in the figure of the plunger 210, for example. The connection between the plunger 210 and the valve body 212 is performed, for example, by inserting and fixing a protrusion provided at the upper end portion of the valve body 212 in the illustrated lower end portion of the plunger 210. can do.

  The electromagnetic valve 170 also has a coil L172 disposed on the outer periphery of the housing 200, a cover 216 that covers the coil L172, and a valve body 212 that is integrated with the plunger 210 in a closed position (that is, the fuel injection opening 206). And a spring 218 biased toward the seat 214) which is the inner bottom surface. Thereby, when the coil L172 is not energized, the valve body 212 hits the inner bottom surface of the fuel injection opening 206 to close the fuel injection opening 206, and stops the fuel injection.

  The valve body 212 integrated with the plunger 210 applies a current of a predetermined magnitude or more to the coil L172 in a predetermined direction (hereinafter, referred to as “positive direction”), thereby causing the spring 218 to move downward. An upward electromagnetic force (that is, an electromagnetic force from the valve closing position to the valve opening position) that overcomes the bias in the direction is biased. As a result, the valve body 212 moves upward in the figure, the fuel injection opening 206 is opened, and the high-pressure fuel gas supplied from the fuel supply opening 204 is injected from the fuel injection opening 206 into the cylinder (not shown). The

  Further, if a current flowing in the direction opposite to the positive direction (hereinafter referred to as “negative direction”) is applied to the coil L172 after the valve body 212 is moved upward in the drawing, In addition to the urging by the spring 218, an electromagnetic force downward in the figure (that is, an electromagnetic force from the valve opening position to the valve closing position) is urged, and the valve body 212 moves toward the seat 214 that defines the valve closing position. It moves quickly and closes the fuel injection opening 206 to stop fuel gas injection. This closed state is maintained by the biasing by the spring 218 even after the energization of the coil L172 is finished.

  Returning to FIG. 1, the electromagnetic valve control device 100 includes a controller 102, a booster circuit 104, transistors Tr120, Tr122, Tr124, Tr126, and a diode D128. Here, the transistors Tr120, Tr122, Tr124, and Tr126 operate as switches, and switching of their on / off states is controlled by a processing device 144 described later. Although the transistors Tr120, Tr122, Tr124, and Tr126 are described as MOS-FETs in FIG. 1, they are other types of FETs or other types of transistors such as bipolar transistors. It can also be. Further, in place of the transistors Tr120, Tr122, Tr124, and Tr126, other circuit components or circuit blocks having a switching function can be replaced.

  Here, in FIG. 1, the current direction from the upper terminal of the coil 172 of the electromagnetic valve 170 toward the illustrated terminal is the above-described positive direction (that is, the valve body 212 is moved from the valve closing position to the valve opening position). Current direction for energizing the electromagnetic force), and the opposite direction is the negative direction described above. That is, the valve body 212 of the solenoid valve 170 is biased in the valve opening direction when a positive voltage with respect to the potential of the lower terminal in the figure is applied to the upper terminal in the figure, and is negatively positive with respect to the potential of the lower terminal in the figure. When a voltage is applied to the terminal on the upper side in the figure, it is energized in the valve closing direction.

  The controller 102 includes a communication interface (INF) 140, an input / output interface (INF) 142, and a processing device 144. The communication INF 140 performs bus communication based on, for example, a CAN (Controller Area Network) standard, and communicates with another ECU (not shown) that controls the operation of the host vehicle including the internal combustion engine provided with the electromagnetic valve 170. The transmitter / receiver can exchange data.

  The input / output INF 142 relays the voltage signal and / or current signal for load driving and information communication output from the processing device 144 and outputs them to the outside, and / or relays the signals received from the outside and inputs them to the processing device. Interface.

  The processing device 144 is a computer having, for example, a processor such as a CPU, a ROM in which a program is written, a RAM for temporary storage of data, and the like, and includes a boost control unit 150, a timing determination unit 152, and a valve opening control unit. 154, a valve opening maintenance control unit 156, and a valve closing control unit 158. Each of the units included in the processing device 144 is realized by the processing device 144 being a computer executing a computer program, for example. The computer program can be stored in any computer-readable storage medium. Alternatively or in addition, all or a part of each of the above units may be replaced by hardware including one or more electronic circuit components (for example, ASIC (Application Specific Integrated Circuit)). It can also be configured.

Boost control unit 150 controls the booster circuit 104 to output the boosted voltage V _U boosts the battery voltage V _B supplied from the outside.

  The timing determination unit 152 acquires, for example, the current throttle opening and the current crank angle for an internal combustion engine (not shown) provided with the electromagnetic valve 170 from another ECU via the communication INF 140, and Based on the acquired current throttle opening, the target fuel injection amount is determined, and the valve opening time for realizing the determined target fuel injection amount is calculated and notified to the valve opening maintenance control unit 156. The timing determination unit 152 determines the valve opening timing (the value of the crank angle at which the valve opening should be started (valve opening start crank angle)) based on the acquired current throttle opening, and the current crank angle is When the determined valve opening start crank angle is reached, a valve opening trigger signal is sent to the valve opening control unit 154, the valve opening maintenance control unit 156, and the valve closing control unit 158.

  The valve opening control unit 154 controls the valve opening operation of the electromagnetic valve 170 by controlling the gate voltage VG1 of the transistor Tr120, the gate voltage VG2 of the transistor Tr122, and the gate voltage VG3 of the transistors Tr124 and Tr126. More specifically, when the power of the controller 102 is turned on, the valve opening control unit 154 first controls VG1 to VG3 to initialize Tr120, Tr122, and Tr126 to off, and turn on Tr124. To prepare for valve opening operation.

Further, the valve opening control unit 154, in response to receiving the valve opening trigger signal from the timing determination unit 152, is set to turn on the transistor Tr120, the boosted voltage V _U from the booster circuit 104 via the transistor Tr124 electromagnetic When applied to the valve 170 (specifically, to the coil L172 of the electromagnetic valve 170) (hereinafter referred to as “applying voltage to the electromagnetic valve 170”, “applying current to the electromagnetic valve 170”, etc.) , "Apply voltage to coil L172 of solenoid valve 170" and "apply current to coil L172 of solenoid valve 170").

  Thereby, the valve body 212 of the electromagnetic valve 170 quickly moves from the valve closing position to the valve opening position, and the electromagnetic valve 170 is opened. Further, the valve opening control unit 154 indicates that the valve opening operation has been completed after a sufficient time has passed since the transistor Tr120 is turned on to move the valve body 212 of the electromagnetic valve 170 to the valve opening position. A completion signal is transmitted to the valve opening maintenance control unit 156. Note that the diode 128 is a protective diode for preventing current from flowing from the booster circuit 104 toward the transistor Tr122 via the transistor Tr120 that is turned on.

The valve opening maintenance control unit 156 controls the gate voltages VG1 and VG2 and the source voltage V1 of the transistor Tr122 to control the open state of the electromagnetic valve 170. That is, in response to receiving the valve opening trigger signal from the timing determination unit 152, the valve opening maintenance control unit 156 has the voltage (in order to maintain the valve open state of the electromagnetic valve 170 at the source voltage V1 of the transistor Tr122. to set the valve opening sustain voltage) V _m (e.g., during the valve-opening sustain voltage V _m, the battery voltage V _B supplied from the outside is used). Thereafter, the valve-opening maintenance control unit 156 turns on the transistor Tr122 and turns off the transistor Tr120 in response to receiving the valve-opening completion signal from the valve-opening control unit 154, and sets the source voltage V1. The sustain voltage V _m is applied to the electromagnetic valve 170 via the transistor Tr124. Thereby, the valve body 212 of the electromagnetic valve 170 is stably maintained at the valve opening position, and the valve opening state of the electromagnetic valve 170 is maintained.

Further, the valve opening maintenance control unit 156 turns off the transistor Tr122 when the elapsed time from reception of the valve opening trigger signal reaches the valve opening time based on the valve opening time received from the timing determination unit 152. Te stops the application of the valve-opening holding voltage V _m to the electromagnetic valve 170, and sends a valve open maintaining end signal to the valve closing control unit 158.

Incidentally, the valve opening maintenance control unit 156, upon application of a valve-opening sustain voltage V _m to the electromagnetic valve 170, by pulsing the solenoid valve 170 by turning on and off the transistor Tr122 in accordance with known techniques, current supplied to the coil L172 The effective value can be lowered to reduce power consumption.

  The valve closing control unit 158 performs a predetermined time change pattern (hereinafter referred to as “voltage pattern”) for a voltage during the valve closing operation for moving the valve body 212 of the electromagnetic valve 170 from the valve opening position to the valve closing position. The voltage applied to the electromagnetic valve 170 is controlled. More specifically, the valve closing control unit 158 controls the source voltage V2 of the transistor Tr126 and the gate voltage VG3 of the transistors Tr124 and Tr126, or the source voltage V2, the gate voltage VG3, the source voltage V1, and the gate voltage VG2. Is controlled to change the voltage applied to the electromagnetic valve 170 so as to coincide with the predetermined voltage pattern.

  The predetermined voltage pattern includes at least applying a first voltage to the solenoid valve 170 so as to urge the valve body 212 of the solenoid valve 170 from an electromagnetic force toward the valve closing position. It is. As a result, the valve element 212 of the electromagnetic valve 170 can be moved from the valve opening position to the valve closing position more quickly than in the case where the valve closing operation is performed only by urging the spring 218, thereby shortening the valve element movement time. Can do.

  The predetermined voltage pattern includes applying a second voltage to the electromagnetic valve 170 so that the moving acceleration or moving speed of the valve body 212 decreases before the valve body 212 reaches the valve closing position. Can be included. Thereby, the bounce period can be shortened by suppressing the bounce of the valve body 212 with respect to the seat 214 after the valve body 212 collides with the seat 214 that defines the valve closing position. The second voltage may be, for example, a voltage having the same polarity as the first voltage and having a smaller absolute value than the first voltage, or a voltage whose polarity is inverted with respect to the first voltage. it can.

  Further, the predetermined voltage pattern includes, after applying the second voltage, gradually changing the applied voltage to the electromagnetic valve 170 from the second voltage to zero along a predetermined change line. Can be made. Thereby, coupled with the application of the second voltage, the valve body 212 can be stably stopped at the valve closing position. Here, the value of the second voltage and / or the predetermined change line is determined by experiment, for example, from the viewpoint of effectively suppressing the bounce period in relation to the first voltage, and the predetermined voltage pattern. Can be included.

  FIG. 3 is a diagram illustrating an example of the predetermined voltage pattern. 3 indicates the voltage at the upper terminal of the coil L172 of the electromagnetic valve 170 in FIG. 1 with respect to the potential at the lower terminal (the ground potential in FIG. 1) (therefore, with a negative voltage). The valve body 212 is urged in the valve closing direction), and the horizontal axis indicates the elapsed time after the valve closing control unit 158 starts the valve closing operation (therefore, the origin of time zero is the time when the valve closing operation starts). Corresponding). Hereinafter, the “applied voltage to the electromagnetic valve 170” refers to a voltage applied to the upper terminal of the electromagnetic valve 170 in FIG. 1 with reference to the potential of the lower terminal of the figure.

In the voltage pattern of FIG. 3, a negative voltage −V _o1 is applied to the solenoid valve 170 at the start of the valve closing operation, a positive voltage + V _o2 is applied after the elapse of time t _g1 from the start of the valve closing operation, and then the valve is closed. It is shown that the voltage starts to decrease after elapse of time t _g2 from the start of the valve operation, and the applied voltage is made zero after elapse of time t _g3 from the start of the valve closing operation. Here, the negative voltage -V _o1 is applied by applying the first voltage to the solenoid valve 170 so as to urge the valve body 212 of the solenoid valve 170 from the valve opening position to the valve closing position. The positive voltage + V _o2 is applied to the electromagnetic valve 170 with a second voltage so that the moving speed of the valve body 212 decreases before the valve body 212 reaches the valve closing position. The decrease in the applied voltage from the positive voltage + V _{o2 at} t _g2 to t _g3 corresponds to the “applied voltage to the solenoid valve 170 as a second voltage along a predetermined change line”. To gradually change from zero to zero ”.

  The valve closing control unit 158 controls the voltage applied to the electromagnetic valve 170, for example, as follows, for example, according to a voltage pattern as shown in FIG. 3 (that is, a predetermined time change pattern for the voltage).

In response to receiving the valve opening trigger signal from the timing determination unit 152, the valve closing control unit 158 first sets the first voltage indicated as the voltage to be applied at time zero in the voltage pattern shown in FIG. The corresponding voltage -V _o1 is set to the source voltage V1 of the transistor Tr122. At this time point when the valve opening trigger signal is received from the timing determination unit 152, the transistor Tr126 is turned off and the Tr124 is turned on by the valve opening control 154. Therefore, the voltage −V _o1 set to the source voltage V2 is the electromagnetic valve. It is not applied to the coil L172 of 170.

The processing device 144 includes, for example, a DC power supply circuit (not shown) (for example, a charge pump circuit) that generates a negative voltage from the battery voltage V _B supplied from the outside, or supplies a negative voltage from the outside. It is assumed that a power supply line (not shown) is connected, and the valve closing control unit 158 uses the negative voltage supplied from the DC power supply circuit or the outside to convert the negative voltage necessary for valve closing control to the source voltage V1. And / or V2.

Thereafter, the valve closing control unit 158 controls VG3 to turn off the transistor Tr124 and turn on the Tr126 in response to receiving the valve opening maintenance end signal from the valve opening maintenance control unit 156, and is set to the source voltage V2. The applied voltage -V _o1 is applied to the coil L172 of the electromagnetic valve 170 to start the valve closing operation. At the same time, the valve closing control unit 158 sets + V _o2 corresponding to the second voltage, which is shown as the voltage to be applied after the elapse of time t _{g1 in} the voltage pattern shown in FIG. 3, to the source voltage V1 of the transistor Tr122. At the same time, VG2 is controlled to turn on the transistor Tr122. At this point, since the transistor Tr124 as described above is set to OFF, the voltage + V _o2 of the source voltage V1 is not applied to the coil L172 of the solenoid valve 170.

Subsequently, closing the control unit 158, after a time t _g1 from the reception of the open maintenance termination signals, and controls the gate voltage VG3, the transistor Tr124 on and off Tr126. As a result, the voltage + V _o2 of the source voltage V1 is applied to the coil L172.

Further, the valve closing control unit 158 gradually decreases the source voltage V1 from the voltage + V _o2 to zero according to the voltage pattern shown in FIG. 3 after the elapse of time t _g2 after receiving the valve opening maintenance end signal, The voltage applied to the solenoid valve 170 is gradually decreased from the voltage + V _o2 to zero.

  As described above, the valve closing control unit 158 can control the voltage applied to the electromagnetic valve 170 in accordance with, for example, the voltage pattern shown in FIG. 3 (that is, a predetermined time change pattern for the voltage).

  The solenoid valve control device 100 having the above configuration controls the voltage applied to the solenoid valve 170 in accordance with a predetermined time change pattern (predetermined voltage pattern) regarding the voltage, and the valve body 212 of the solenoid valve 170. Since the first voltage is applied to the electromagnetic valve 170 so as to energize the electromagnetic force from the valve opening position to the valve closing position, the valve body 212 of the electromagnetic valve 170 is quickly moved from the valve opening position to the valve closing position. Thus, it is possible to shorten the valve body moving time for the valve closing operation.

  Further, in the electromagnetic valve control device 100, the electromagnetic valve 170 has a second voltage applied to the electromagnetic valve 170 so as to reduce the moving acceleration or moving speed of the valve body 212 before the valve body 212 reaches the valve closing position. By including the application of a voltage, the bounce period can be shortened by suppressing the bounce of the valve body 212 against the seat 214 after the valve body 212 collides with the seat 214 defining the valve closing position. it can.

  In addition, the time measurement required for the timing determination of each control in the valve-opening control unit 154, the valve-opening maintenance control unit 156, and the valve-closing control unit 158 described above is measured, for example, from a clock circuit (not shown) provided in the processing device 144 Or by a timer (not shown) provided in the processing device 144.

  FIG. 4 is a diagram illustrating an example of the operation of the electromagnetic valve 170 when the electromagnetic valve control device 100 controls the closing operation of the electromagnetic valve 170 along the predetermined voltage pattern illustrated in FIG. 3. 4 (a), 4 (b), and 4 (c) show the time change of the voltage applied to the solenoid valve 170 (shown by the line 400) and the time change of the current flowing through the solenoid valve 170 (energization current), respectively. (Shown by line 402) shows the time change (shown by line 404) of the lift amount of the valve body 212 of the solenoid valve 170 (ie, the amount of movement from the valve closing position to the valve opening position). It is a figure, and the horizontal axis has shown time in each figure.

When the valve opening control unit 154 applies the voltage V _U to the electromagnetic valve 170 in response to the valve opening trigger signal from the timing determination unit 152 at time t _o1 (FIG. 4A), the valve body 212 of the electromagnetic valve 170 is At time t _o2 when the energization current of the electromagnetic valve 170 reaches the current necessary for moving the valve body, the movement starts from the valve closing position to the valve opening position (FIG. 4C). Thereafter, at time t _o3 when sufficient time has elapsed for the valve element 212 to reach the valve opening position, the valve opening control unit 154 sends a valve opening completion signal indicating that the valve opening operation has been completed to the valve opening maintenance control unit. The valve opening maintenance control unit 156 applies the valve opening maintenance voltage V _m (e.g., equal to the battery voltage V _B ) to the electromagnetic valve 170 (FIG. 4A). As a result, the energization current of the electromagnetic valve 170 is lowered to a current value sufficient to maintain the valve open state (FIG. 4B), and the valve body 212 is maintained in the valve open position (FIG. 4C). ).

When the valve opening maintenance control unit 156 sends a valve opening maintenance end signal to the valve closing control unit 158 at time t _o4 when the valve opening time calculated by the timing determination unit 152 has elapsed, the valve closing control unit 158 in accordance with a predetermined voltage pattern shown in 3, by applying a voltage -V _o1 to the solenoid valve 170 when the valve is closed operation start to accelerate the movement of the valve closing position of the valve element 212 of the solenoid valve 170 (FIGS. 4 (a) ). Subsequently, closing the control unit 158, in accordance with a predetermined voltage pattern shown in FIG. 3, for a period between times t _o5 and time t _o6 that over time t _g1 and t _g2 from time t _o4, the voltage + V _o2 Is applied to the electromagnetic valve 170 to reduce the moving speed of the valve body 212 to the closed position. Further, the valve closing control unit 158 gradually decreases the applied voltage from time t _o6 according to the predetermined voltage pattern shown in FIG. 3, and reduces the applied voltage to zero at time t _o7 when time t _g3 elapses from time t _o4. (FIG. 4A).

As a result, during the valve closing operation after time t _o4, the electromagnetic force energized by the application of the voltage −V _o1 is added to the energization by the spring 218 to quickly move the valve body 212 to the valve closing position. The valve body moving time is effectively shortened. Further, the bounce period after the valve body 212 reaches the valve closing position due to the decrease in the moving speed of the valve body 212 due to the subsequent application of the voltage + V _o2 and the end of the voltage application along the predetermined change line. It is shortened or eliminated (FIG. 4C).

In the above-described operation example, the movement speed of the valve body 212 is decreased by applying the voltage + V _o2 . However, the present invention is not limited to this, and the movement acceleration of the valve body 212 is decreased before reaching the valve closing position. It is good also as what makes it. For example, when the elastic coefficient between the valve body 212 and the seat 214 is small, the electromagnetic force is decreased as the valve closing position is approached (that is, the moving acceleration of the valve body 212 is decreased), for example, the seat 214 The bounce period can be shortened by limiting the moving speed of the valve body 212 when colliding with the valve to a predetermined speed range.

  That is, the predetermined voltage pattern is not limited to the pattern shown in FIG. 3, and the valve body 212 is accelerated in the valve closing position direction, and the moving speed or movement acceleration of the valve body 212 is reached before reaching the valve closing position. Various patterns can be formed within the range in which the reduction is included.

  FIG. 5 is a diagram showing various other examples of the predetermined voltage pattern. In each diagram of FIG. 5, the vertical axis represents the voltage applied to the electromagnetic valve 170, and the horizontal axis represents the elapsed time from the start of the valve closing operation.

5 (a) is, after accelerating the valve body 212 by applying a voltage -V _h1 in a period of 0 to t _h1, decelerates the speed of the valve body 212 by applying a voltage + V _h2 at t _h1, Thereafter, the voltage is gradually decreased without maintaining the voltage of + V _h2 , and the applied voltage is reduced to zero at t _h2 . 3 and 5A and FIGS. 5C, 5F, 5G, and 5J described later, the applied voltage is changed from the corresponding second voltage to zero. Although the predetermined change line is drawn linearly, the predetermined change line is not limited to this, and can be defined as a line having an arbitrary shape including a curve.

In FIG. 5 (b), after accelerating the valve body 212 by applying a voltage -V _h3 in a period of 0 to t _h3, decelerates the speed of the valve body 212 by applying a voltage + V _h4 in t _h3, After that, the voltage application is _stopped after maintaining + V _{h4 up} to t _h4 . Figure 5 (c), the after starting the acceleration of the valve body 212 by applying a voltage -V _h5 at time 0, and gradually raising the voltage until time t _h6 toward voltage + V _h6, then, the time t _The voltage is gradually reduced to zero toward _h7 . In this voltage pattern, after the valve body 212 obtains the maximum acceleration at time 0 and starts moving to the valve closing position, the acceleration is gradually reduced and the acceleration is reversed after time t _h5 when the polarity of the applied voltage is reversed. As a result, the movement speed decreases.

In FIG. 5D, after the voltage -V _h8 is applied at time 0 to start the acceleration of the valve body 212, a voltage pulse having an amplitude of the voltage + V _h9 is applied in the period t _{h8 to} t _h9 . The body 212 is decelerating. Further, in FIG. 5 (e), the after starting the acceleration of the valve body 212 by applying a voltage -V _h10 at time 0, in the period t _h10 ~t _h11, a voltage pulse to the voltage + V _h11 and amplitude, The valve body 212 is decelerated while applying the duty ratio while decreasing the deceleration to the valve body 212.

5F to 5J, the acceleration acting on the valve body 212 is reduced after the valve body 212 is accelerated (deceleration is not performed). That is, in FIG. 5 (f), the after accelerated valve body 212 by applying a voltage -V _h12 during the period 0 to t _h12, applying a small voltage -V _h13 absolute value than the voltage -V _h12 in t _h12 Then, after the acceleration of the valve body 212 is decreased and the voltage −V _h13 is maintained until the time t _h13 , the applied voltage is gradually changed from the voltage −V _h13 to zero toward the time t _h14 . In FIG. 5 (g), after accelerating the valve body 212 by applying a voltage -V _h14 during the period 0 to t _h15, by applying a small voltage -V _h15 absolute value than the voltage -V _h14 in t _h15 reducing the acceleration of the valve body 212, then without maintaining the voltage of -V _h15, gradually changing the applied voltage toward the time t _h16 to zero.

In FIG. 5 (h), after accelerating the valve body 212 by applying a voltage -V _h16 during the period 0 to t _h17, by applying a small voltage -V _h17 absolute value than the voltage -V _h16 in t _h17 The acceleration of the valve body 212 is decreased and the voltage _application is _stopped after the voltage −V _h17 is maintained up to t _h18 . In FIG. 5 (j), after applying voltage −V _h18 at time 0 to start acceleration of the valve body 212, the absolute value of the applied voltage is gradually decreased toward voltage −V _h19 until time t _h19 . Thereafter, the applied voltage is gradually reduced toward zero until time t _h20 . In this voltage pattern, after starting to move to the closed position the valve body 212 to obtain a maximum acceleration at time 0, the acceleration at a different rate in the period and the period of t _h19 ~t _h20 of 0 to t _h19 Decrease.

In FIG. 5 (k), after accelerating the valve body 212 by applying a voltage -V _h20 during the 0~t _h20, t _h20 ~t small voltage absolute value than the voltage -V _h20 during the period of _h21 -V A voltage pulse having an amplitude of _h21 is applied to reduce the acceleration of the valve body 212. Although not shown in FIG. 5, during the period from t _{h20 to} t _h21 , a voltage pulse having an amplitude of voltage −V _h21 having an absolute value smaller than voltage −V _h20 is applied while reducing the duty ratio. The acceleration of the body 212 may be gradually reduced to zero.

  In this embodiment, the valve closing control unit 158 controls the voltage applied to the electromagnetic valve 170 during the valve closing operation according to a predetermined voltage pattern. However, the present invention is not limited to this, and the predetermined voltage pattern and A similar predetermined current pattern may be used, and the current supplied to the solenoid valve 170 may be controlled according to the predetermined current pattern.

  In the present embodiment, as shown in FIG. 1, the transistors Tr124 and Tr126 are used as the drive circuit of the electromagnetic valve 170, and the voltage V2 controlled by the controller 102 is used as the source voltage of the transistor Tr126. The drive circuit is not limited to this, and may be any circuit within a range in which the voltage applied to the electromagnetic valve 170 can be controlled according to a predetermined voltage pattern.

For example, as shown in FIG. 6, instead of the transistors Tr124 and Tr126 shown in FIG. 1, the drive circuit of the electromagnetic valve 170 is composed of transistors Tr600, Tr602, Tr604, Tr606, and the voltage V1 is controlled by a controller similar to the controller 102. and V2, and transistors Tr600, Tr602, Tr604, and gate voltage VG41 of Tr606, VG42, VG43, and controls the VG44, the voltage V _U and the voltage V1 is applied to the positive direction with respect to the solenoid valve 170 (e.g., Tr600 And Tr606 are turned on and Tr602 and Tr604 are turned off and applied), and the voltage V2 is applied in the negative direction (for example, Tr600 and Tr606 are turned off and Tr602 and Tr604 are turned on and applied). it can. In the configuration of FIG. 6, it is not necessary to set the voltage V2 to a negative voltage (that is, a positive voltage having the same absolute value as the negative voltage that is set to the voltage V2 in the above description using FIG. 6), a power supply circuit for generating a negative voltage and a negative voltage supply line are not necessary, and the configuration of the controller can be simplified.

  In the present embodiment, the electromagnetic valve 170 controlled by the electromagnetic valve control device 100 includes one coil L172, and the polarity of the voltage applied to the coil L172 changes (that is, the current supplied to the coil L172 flows). The direction of the electromagnetic force urged by the valve body 212 is changed by changing the direction). However, the present invention is not limited to this, and the electromagnetic valve controlled by the electromagnetic valve control device according to the present invention is used. Can have an arbitrary configuration within a range in which electromagnetic force is selectively generated in two directions opposite to the valve body.

  For example, in the configuration of the electromagnetic valve 170 shown in FIG. 2, an additional coil is provided in addition to the coil L172, and when the coil L172 is energized, an electromagnetic force from the valve closing position to the valve opening position acts on the valve body 212. When the additional coil is energized, it is assumed that an electromagnetic force from the valve opening position to the valve closing position acts on the valve element 212. By selectively energizing the coil L172 or the additional coil, the valve element 2 is opposed to the valve element 2. Electromagnetic force in one direction may be selectively generated.

  In this case, a predetermined voltage pattern for the coil L172 and a predetermined voltage pattern for the additional coil are determined in advance as a predetermined time change pattern (predetermined voltage pattern) for the voltage. The valve closing control unit 158 controls the acceleration of the valve body 212 from the valve opening position to the valve closing position by controlling the voltage applied to the additional coil in accordance with the corresponding predetermined voltage pattern, and the application to the coil L172. By controlling the voltage, it is possible to perform deceleration control of the moving speed of the valve body 212 from the valve opening position to the valve closing position.

  As described above, the electromagnetic valve control device 100 according to the present embodiment controls the electromagnetic valve 170 configured to selectively generate electromagnetic force in two directions opposite to the valve body 212, and When controlling the solenoid valve 170, the applied voltage or energization current to the solenoid valve 170 is controlled according to a predetermined time change pattern for voltage or current. The predetermined time change pattern is obtained by applying a first voltage to the electromagnetic valve 170 or applying a first voltage to the electromagnetic valve 170 so as to urge the valve body 212 with an electromagnetic force from the valve opening position to the valve closing position. Including energizing one current. Thereby, this electromagnetic valve control apparatus 100 can shorten a valve body movement time effectively with the magnitude | size of a 1st voltage or a 1st electric current.

  The predetermined time change pattern is obtained by applying a second voltage to the electromagnetic valve 170 so that the moving acceleration or moving speed of the valve body 212 decreases before the valve body 212 reaches the valve closing position. Energizing the second current. Thereby, before reaching the valve closing position, the acceleration of the valve body 212 is reduced or the moving speed is reduced, thereby shortening or eliminating the bounce period at the time of the valve closing operation, and promptly bringing the solenoid valve into a stable valve closing state. Can lead to.

  DESCRIPTION OF SYMBOLS 100 ... Solenoid valve control apparatus, 102 ... Controller, 104 ... Booster circuit, Tr120, Tr122, Tr124, Tr126, Tr600, Tr602, Tr604, Tr606 ... Transistor, D128 ... Diode, 140 ..Communication interface 142 ... I / O interface 144 ... Processing device 150 ... Boosting control unit 152 ... Timing determining unit 154 ... Valve opening control unit 156 ... Open Valve maintenance control unit, 158 ... Valve closing control unit, 170 ... Solenoid valve, L172 ... Coil, 200 ... Housing, 202 ... Cap, 204 ... Fuel supply opening, 206 ..Fuel injection opening, 208 ... cavity, 210 ... plunger, 212 ... valve body, 2 4 ... seat, 216 ... cover, 218 ... spring.

Claims (6)

An electromagnetic valve control device for controlling an electromagnetic valve configured to selectively generate electromagnetic force in two directions opposite to a valve body,
An energization control circuit for controlling energization to the solenoid valve when the valve body is moved from the valve opening position to the valve closing position;
The energization control circuit controls the applied voltage or energization current to the solenoid valve according to a predetermined time change pattern for voltage or current,
The predetermined time change pattern is obtained by applying a first voltage to the electromagnetic valve or applying a first voltage to the electromagnetic valve so as to urge an electromagnetic force from the valve opening position to the valve closing position. Including energizing current,
Solenoid valve control device. In the predetermined time change pattern, the electromagnetic valve is energized with a second voltage or a second current so that the moving acceleration or moving speed of the valve body decreases before the valve body reaches the valve closing position. Including
The second voltage is a voltage whose absolute value is smaller than that of the first voltage or whose polarity is inverted with respect to the first voltage,
The second current is a current having an absolute value smaller than that of the first current or a current flowing direction reversed with respect to the first current.
The electromagnetic valve control device according to claim 1. The predetermined time change pattern further includes gradually changing the second voltage or the second current to zero along a predetermined change line.
The electromagnetic valve control device according to claim 2.   The electromagnetic valve control device according to any one of claims 1 to 3, wherein the electromagnetic valve is a fuel injection valve that controls fuel injection into an internal combustion engine. At least one hollow coil;
A plunger movably disposed in the hollow portion of the coil;
A valve body connected to the plunger;
With
The plunger is a magnet magnetized in a movable direction,
The electromagnetic force is selectively generated in two directions opposite to the valve body by energizing at least one of the coils.
Electromagnetic fuel injection valve. A fuel injection valve provided in the internal combustion engine for controlling fuel injection into the internal combustion engine;
The electromagnetic fuel injection valve according to claim 5.

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