JPH11324744A - Control device for solenoid valve at starting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To complete suction of all intake and exhaust valves before starting without applying load to a battery by setting the number of intake and exhaust valves which suck at the same time according to a parameter showing the battery output capability before starting of an engine, and sequentially sucking according to the set number. SOLUTION: A solenoid valve 1 is controlled to drive by a solenoid valve drive control device 30 including a microcomputer 31. In the control for the solenoid valve 1 at starting, before starting, the number of sucking valves 4 is set according to the battery voltage, that is, the output capability of the battery. According to the preset number of the simultaneously sucking valves, the valves 4 are sequentially caused to suck, and after all valves 4 complete suction, engine starting is started. Thus, load applied to the battery can be reduced. Further, when the battery condition is good, all valves 4 are simultaneously caused to suck, so that the valve suction time can be reduced so as to early start the engine.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a start-up control device for an electromagnetically driven valve that variably sets the number of intake and exhaust valves that are simultaneously sucked when the engine is started according to the output capacity of a battery.

[0002]

2. Description of the Related Art In recent years, valve operating systems that electronically control the opening and closing timing of intake and exhaust valves by performing electromagnetic opening and closing operations of the intake and exhaust valves of the engine, not mechanically by a camshaft or the like, have been developed. It has been developed and disclosed in, for example, Japanese Patent Application Laid-Open No. 8-170509 or Japanese Patent Application Laid-Open No. 8-200108.

In the electromagnetically driven valves disclosed in these prior arts, a plate-shaped armature is fixed to the upper end of a valve stem of an intake / exhaust valve, and the intake valve is urged in a valve closing direction with the armature interposed therebetween. Along with a spring and a spring that biases in the valve opening direction, a valve opening electromagnetic coil and a valve closing electromagnetic coil are disposed on the outer periphery of each spring, and when the valve closing electromagnetic coil is excited, When the armature is sucked against the urging force of the valve-opening spring and the intake / exhaust valve closes, and when the valve-opening electromagnetic coil is excited, the armature opposes the urging force of the valve-closing spring. The air is sucked and the intake / exhaust valve opens. The engine is driven by controlling the opening and closing timing of the intake and exhaust valves in synchronization with the rotation of the crankshaft.

[0004] In these electromagnetically driven valves, it is not clear from which stroke each cylinder starts at the start of starting. Further, it is necessary to detect a disconnection of each electromagnetically driven valve. Even if the starter switch is turned on after the power is turned on, the starter motor is not operated immediately, and the full intake / exhaust valve is once suctioned to be fully closed. Upon input, the intake and exhaust valves are controlled to open and close at regular valve timing.

[0005]

However, in the above prior art, all the intake and exhaust valves are simultaneously sucked before the start of the engine. However, simultaneously sucking all the intake and exhaust valves requires a great deal of energy in the battery. This imposes a burden, and the voltage drop of the battery causes a decrease in the rotation speed of the starter motor.

To cope with this, it is conceivable to reduce the load on the battery by sequentially suctioning the intake and exhaust valves individually. However, in recent engines with a tendency toward multi-cylinders and multi-valves, all types of engines are required. The time until suction of the intake and exhaust valves becomes longer, and after turning on the ignition switch,
Even if the starter switch is turned on, the start of the engine is not immediately started, which gives the driver discomfort.

The present invention has been made in view of the above circumstances, and has been made in view of the above circumstances, and has been made in view of the above circumstances. An object of the present invention is to provide a start-up control device for a drive valve.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, an electromagnetically driven valve start-up control device according to the present invention controls the operation of an intake / exhaust valve interposed in an intake / exhaust port of an engine by an electromagnetic coil, thereby starting the engine. In the electromagnetically driven valve that sucks all of the intake and exhaust valves to the fully open side or the fully closed side before the start, the number of the intake and exhaust valves to be simultaneously suctioned based on the parameter indicating the battery output capacity before the start of the engine is set, The intake and exhaust valves are sequentially sucked according to the number of valves.

In this case, preferably, the parameter indicating the battery output capability is a battery voltage.

[0010] More preferably, the parameter indicating the battery output capability is a temperature around the battery.

That is, in the start-up control device for an electromagnetically driven valve according to the present invention, before starting the engine, parameters indicating the battery output capability, such as the battery voltage and the temperature around the battery, are detected. The number is set, and the intake and exhaust valves are sequentially sucked in accordance with the number of valves. After all the intake and exhaust valves have been sucked, the engine is started.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 to 4 show a first embodiment of the present invention.

Reference numeral 1 in FIG. 1 denotes an electromagnetically driven valve interposed in an intake port and an exhaust port of each cylinder of the engine. In the present embodiment, a valve stem guide 3 in which a cylinder head 2 is implanted is provided. In order to open and close a slidably supported valve 4 (an intake valve or an exhaust valve), a twin coil system in which a valve opening electromagnetic coil 5 and a valve closing electromagnetic coil 6 are arranged to face each other is adopted.

In the electromagnetically driven valve 1, the valve opening electromagnetic coil 5 is housed in the yoke 7 and disposed on the cylinder head 2 side, and absorbs dimensional variations among the individual members to reduce the size of the valve 4. The valve closing electromagnetic coil 6 is connected to a yoke 9 via a lift adjuster 8 for adjusting a lift amount. Further, a guide portion for moving an armature 17 described later in the axial direction is formed on an upper portion of the yoke 9 for accommodating the valve closing electromagnetic coil 6 and a lift position for detecting a lift amount of the valve 4. A case 11 for mounting an eddy current type valve lift sensor 10, which is an example of a sensor, is joined.

A valve-closing spring 13 for urging the valve head 4a of the valve 4 in the direction of pressing against the valve seat 12 is housed inside the valve-opening electromagnetic coil 5. The valve-closing spring 13 includes a retainer 15 fixed to the end of the valve stem 4b of the valve 4 via a cotter pin 14, and a receiving seat formed around the valve stem guide 3 on the cylinder head 2 side. It is interposed between. In addition, at the tip of the valve stem 4b,
A shim 16 for clearance adjustment to be described later is mounted.

In the space formed by the lift adjuster 8 of the electromagnetically driven valve 1, when the valve-opening electromagnetic coil 5 or the valve-closing electromagnetic coil 6 is excited, the magnetic force therefrom is applied. A plate-shaped armature 17 for receiving and opening and closing the valve 4 is provided.

At the center of the armature 17 on the side of the valve opening electromagnetic coil 5, an armature stem 17a is integrally or separately provided upright. The arm 11 is slidably inserted into an armature stem guide 18 provided on a cylindrical portion of the case 11 projecting from the case 11. A valve opening spring 19 for urging the valve head 4a in a direction away from the valve seat 12 is interposed between the armature 17 and a receiving portion formed at the base of the cylindrical portion of the case 11. Have been.

When both the valve-opening electromagnetic coil 5 and the valve-closing electromagnetic coil 6 are OFF, the armature 17 comes into contact with the shim 16 at the tip of the valve stem 4b and the valve-closing spring 13 It is stationary at a position where the urging force and the urging force of the valve opening spring 19 are balanced.

Further, the distal end side of the armature stem 17a is formed into a small needle shape and serves as a lift sensor target 17c which is a detection target of the valve lift sensor 10. The lift sensor target 17c Is detected by the valve lift sensor 10 as the lift of the valve 4. The valve lift sensor 10 outputs a voltage that is linear with respect to the valve lift amount.

The drive of the electromagnetically driven valve 1 having the above configuration is controlled by an electromagnetic valve drive control device 30. In this electromagnetic valve drive control device 30, a microcomputer (microcomputer) 31 opens and closes the intake valve and the exhaust valve of each cylinder based on various data such as the engine speed, accelerator opening, crank angle pulse, and engine coolant temperature. And the valve closing electromagnetic coil 6 and the valve opening electromagnetic coil 5 are respectively connected to the valve closing electromagnetic coil drive circuit 3.
6. Alternately ON via valve opening electromagnetic coil drive circuit 37
Then, the valve 4 is opened and closed.

That is, in order to open the valve 4 from the closed state, the valve closing electromagnetic coil 6 is turned off and the valve opening electromagnetic coil 5 is turned on at a predetermined timing. As a result, an attractive force is generated in the valve opening electromagnetic coil 5 and the armature 1
7 moves further to the valve opening electromagnetic coil 5 side from the position where the urging force of the valve closing spring 13 and the urging force of the valve opening spring 19 are balanced, and the armature 17 is attracted to the valve opening electromagnetic coil 5 side. When stopped, the valve 4 reaches the maximum lift position (valve fully open position) and the valve opening operation is completed.

On the other hand, to close the valve 4 from the open state, the valve opening electromagnetic coil 5 is turned off, and then the valve closing electromagnetic coil 6 is turned on at a predetermined timing. In this valve closing operation, a return force to a balanced position between the urging force of the valve closing spring 13 and the urging force of the valve opening spring 19, and
The armature 17 is moved by the attraction force of the valve closing electromagnetic coil 6.
Moves to the valve closing electromagnetic coil 6 side, and finally, the armature 17 is attracted to the valve closing electromagnetic coil 6 side and stops, the armature 17 is moved to the shim 1 at the tip of the valve stem 4b.
6, a predetermined clearance is formed, and the valve head 4a is pressed against the valve seat 12 by the valve closing spring 13 to be seated (the valve is fully closed).

The electromagnetic valve drive control device 30 includes a microcomputer 31, an electromagnetic coil control circuit 33, and a hold current control circuit 35. The microcomputer 31 calculates the opening / closing timing of the intake valve and the exhaust valve of each cylinder based on various data such as the engine speed, the accelerator opening, the crank angle pulse, and the engine cooling water temperature. In addition to outputting a trigger signal indicating the start of closing or opening of the intake valve and the exhaust valve, the hold current control circuit 35
To output valve hold time data and a PWM signal for determining a holding period of the valve fully open or the valve fully closed.
In the figure, a circuit system for driving one electromagnetically driven valve 1 is shown as a representative. Actually, a circuit having the same configuration is provided after the microcomputer 31 by the number of intake and exhaust valves of the engine. As many as the number of systems are provided.

In the electromagnetic coil control circuit 33, based on a trigger signal from the microcomputer 31, a valve closing electromagnetic coil driving circuit 36 and a valve opening electromagnetic coil driving circuit 37 are supplied with a drive pulse signal at the time of valve closing or valve opening. Is output.

The valve closing electromagnetic coil driving circuit 36 and the valve opening electromagnetic coil driving circuit 37 perform overexcitation at a high voltage based on the driving pulse signal output from the electromagnetic coil control circuit 33, and perform coil excitation. When the required attraction force is secured by speeding up the rise of the current, and when the fully closed position or the fully opened position is reached, the chopper control at the rated voltage is performed based on the PWM signal output from the hold current control circuit 35. , Maintain the specified hold current.

The valve closing electromagnetic coil driving circuit 36 and the valve opening electromagnetic coil driving circuit 37 have the same configuration, and as shown in FIG.
2, a capacitor 76 is connected to the high-voltage power charger 73 via a diode 75 for charging a power supply for over-excitation (primary over-excitation) for accelerating the intake / exhaust valve at the beginning of startup. In addition, a power supply for overexcitation (secondary overexcitation) for finely adjusting the speed immediately before reaching the fully closed or fully opened state at a high voltage slightly lower than the overexcitation voltage at the initial stage of the rising through the diode 79 is charged. The capacitor 80 is connected.

The charger control section 72 operates the high voltage power supply charger 73 in response to a charge signal (valve closing charge signal or valve opening charge signal) from the microcomputer 31, and is connected to the output side of the high voltage power supply charger 73. Based on a signal from the charging voltage detecting unit 74, the voltage of the power supply 71 is set to a set voltage (for example, 120
V), and the capacitors 76 and 80 are charged.

The collector of an NPN-type power transistor 77 is connected to a capacitor 76 for charging the power supply for primary overexcitation. The emitter of the power transistor 77 is connected via a diode 78 to the valve opening electromagnetic coil 5 or the valve closing valve. Connected to the electromagnetic coil 6.

A collector of an NPN type power transistor 81 is connected to a capacitor 80 for charging a power supply for secondary overexcitation.
Is connected to the valve opening electromagnetic coil 5 or the valve closing electromagnetic coil 6 via a diode 82.

Further, the collector of an NPN power transistor 83 for holding current is connected to the power supply 71, and the emitter of the power transistor 83 is connected via a diode 84 to the valve opening electromagnetic coil 5 or the valve closing electromagnetic coil. It is connected to the coil 6.

The power transistors 77, 81
Is connected to an electromagnetic coil control circuit 33, and a base of the power transistor 83 is connected to a hold current control circuit 35. In the electromagnetic coil control circuit 33, a trigger signal is output to the base of the power transistor 77 in the initial section of the rising of the intake valve or the exhaust valve, and the section immediately before the intake valve or the exhaust valve is fully opened or fully closed. Then, a trigger signal is output to the base of the power transistor 81. Further, the hold current control circuit 35 outputs a PWM signal to the base of the power transistor 83 during the period when the valve is fully opened or fully closed, and outputs the PWM signal to the valve opening electromagnetic coil 5 (or the valve closing electromagnetic coil 6). Generates a hold current to be energized.

As a result, the acceleration response at the initial stage of closing or opening the intake / exhaust valve is improved, and the speed is finely adjusted when the intake / exhaust valve is fully closed or fully opened.

The input side of the microcomputer 31 is connected to an ignition switch 40, a starter switch 41, and a crank angle sensor 42 in addition to the valve lift sensor 10, and a charging voltage detecting unit 74.
Are connected to monitor the capacitor voltage, and further, the battery voltage is connected and monitored.

Further, an output side of the microcomputer 31 is connected to an engine control unit (not shown). The starter motor energization signal for permitting the starter motor to be energized is supplied to the engine control unit. The control of No. 1 terminates the control at the time of starting and switches to the control at the normal valve timing, and outputs a normal timing valve operation signal for operating the fuel injection and ignition timing at the normal timing.

Incidentally, the ignition switch 40 is turned off.
Since the electromagnetic coils 5 and 6 provided on the electromagnetically driven valve 1 in the state are in a non-energized state, each valve 4
A balanced neutral position between the springs 13 and 19,
That is, as shown in FIG. 1, the valve is at rest in a half-open state.

The starting control of the electromagnetic valve 1 in the electromagnetic valve driving control device 30 is performed according to the flowcharts shown in FIGS.

Hereinafter, the start-time control processing employed in this embodiment will be described according to the start-time control routine of FIG. 3 and the valve suction subroutine of FIG. In the present embodiment, before starting the engine, the number of valves 4 to be suctioned is set according to the output capability of the battery voltage, and the valves 4 are sequentially sucked according to the set number of valves for simultaneous suction. After the suction of the valve 4 is completed, the engine start is started.

In the start-time control routine of FIG. 3, first, in step S1, the ignition switch 40 is referred to.
When the ignition switch 40 is OFF, the routine exits as it is, and the ignition switch 40 is turned ON.
Wait until you do. And the ignition switch 4
When 0 is turned on, the process proceeds to step S2, and the battery voltage is detected.

Subsequently, in step S3, the number of valves 4 to be simultaneously sucked is determined based on the battery voltage, that is, the state of charge of the battery. In the present embodiment, the number of valves 4 to be simultaneously sucked is determined with reference to the table shown in the table below, using the battery voltage as a parameter.

[0040]

Accordingly, when the battery voltage is 14 V or more, all valves 4 are simultaneously sucked at the time of executing the first start-up control routine after the ignition switch is turned on, thereby reducing the delay time until the start of start-up. When the battery voltage is in the range of 13 to 14 V, all the intake valves are simultaneously sucked first, and then all the exhaust valves are simultaneously sucked, so that no burden is imposed on the battery voltage, and the delay until the start of the starting operation. Reduce time. Further, when the battery voltage is in a relatively low state of 13 V or less, for example, when starting from a state where the vehicle is parked in a cold region, each valve 4
Is individually suctioned, thereby reducing the load on the battery.

At step S4, charging of the capacitors 76 and 80 of the valve opening electromagnetic coil driving circuit 37 corresponding to the valve 4 to be suctioned determined at step S3 is started. Detect voltage.

Then, it is checked whether or not the capacitor voltage has reached a voltage (set voltage) sufficient to suck the valve 4, and if not, the process returns to step S1. on the other hand,
When the capacitor voltage has reached the set voltage, the process proceeds to step S6, and a valve suction subroutine is executed.

This valve suction subroutine is processed according to the flowchart shown in FIG. Hereinafter, in this valve suction subroutine, first, step S21
At this time, the primary over-excitation current and the secondary over-excitation current charged in the capacitors 76 and 80 of the valve opening electromagnetic coil drive circuit 37 are applied to the valve opening electromagnetic coil 5 of the valve 4 selected at the same time to be sucked. Power is supplied at a predetermined timing.

In step S22, the capacitors 76 and 80 of the valve opening electromagnetic coil drive circuit 37 are recharged in preparation for the next valve suction. Further, step S2
In step 3, the output of the valve lift sensor 10 is read, and in steps S24 and S25, the hold state is determined.

In this embodiment, the output value of the valve lift sensor 10 is within 10% of the value initially set as the output value at the time of full opening, and the valve lift sensor 10
When the output change within 1% continues within 1%, it is determined that the output value is the valve hold, that is, the output value when the valve 4 is fully closed, and the process proceeds to step S26, where the output value of the valve lift sensor 10 at this time is determined. (Hole drift value) is detected and stored in a RAM (not shown) of the microcomputer 31 as a fully open reference value, and a hold current is supplied to the valve opening electromagnetic coil 5 to change the fully open state of the valve 4. Then, the process exits the routine and proceeds to step S7 of the above-described start-time control routine.

In step S7, it is checked whether or not suction of all the valves 4 has been completed. If not completed, the process returns to step S1 and proceeds to step S4 through steps S1 to S3.
Charging of the capacitors 76 and 80 of the valve opening electromagnetic coil drive circuit 37 of the valve 4 to be sucked next is started from among the unsucked valves 4, and when the capacitor voltage reaches a predetermined value or more, the steps from step S5 to step S5 are performed. Proceeding to S6, the valve suction subroutine is executed again.

If the suction has been completed for all the valves 4, the process proceeds to step S8, where the state of the starter switch is checked. If the starter switch is OFF, the process returns to step S1.
If it is ON, the process proceeds to step S9 to start the starter motor.

Thereafter, at step S10, the crank angle is detected based on the crank angle pulse, and at step S11,
At the regular valve timing synchronized with the crank angle, each valve 4 is sequentially fully closed in accordance with the aforementioned valve suction subroutine.

Then, the process proceeds to a step S12, in which a normal timing valve operation signal is output to the engine control device, fuel injection and ignition are permitted, and the routine exits.

As a result, fuel injection and ignition for the fuel injection target cylinder and the ignition target cylinder are sequentially started at regular timing, and the engine is started. Incidentally, the fuel injection and the ignition may be started after all the valves 4 are once closed.

As described above, in the present embodiment, when the valves 4 are sucked before the start of the engine, the number of valves 4 to be sucked simultaneously is determined according to the state of the battery, and all the valves 4 are sucked sequentially. Accordingly, the load on the battery is reduced, and a decrease in the rotation speed of the starter motor due to a drop in the battery voltage can be prevented. Further, when the battery condition is good, all the valves 4 are simultaneously sucked, so that the valve suction time is shortened and the engine can be started early.

Incidentally, the parameter indicating the battery output capability is not limited to the battery voltage, but may be a battery peripheral temperature such as a cooling water temperature, an outside air temperature, an inside chamber temperature, or a battery temperature. In this case, as shown in FIG. 5, step S1 is performed instead of step S2 of the start-time control routine.
In step S3, a table is searched using the battery ambient temperature as a parameter to determine the number of valves 4 to be simultaneously sucked.

For example, when the outside air temperature is adopted as the battery ambient temperature, the valve 4 to be sucked at the same time is determined according to the following table.

[0055]

The present invention is not limited to the above-described embodiment. For example, based on a parameter indicating a battery output capability such as a battery voltage, the number of simultaneously sucked valves 4 can be further finely divided to perform precise control. It may be performed.

Further, all the valves 4 may be sucked in the fully closed direction before the start of the engine. In this case, in step S11, each valve 4 is sequentially fully opened at the regular valve timing.

Further, the operation start timing of the starter motor may be made variable according to the output capacity of the battery at the start of engine start. That is, for example, when the battery voltage is 14 V or more, the operation of the starter motor is permitted at the same time as charging the capacitors 76 and 80.
The start timing of the starter motor is delayed until the charging of the capacitors 76 and 80 is completed. As a result, according to the state of charge of the battery, it is possible to achieve both the reliable suction of all the valves 4 and the earlier start start timing.

[0059]

As described above, according to the present invention,
When the intake and exhaust valves are sucked before the engine starts, the number of intake and exhaust valves that are simultaneously sucked is variably set according to the battery output capacity. The suction of the valve can be completed.

Further, when the output capability of the battery is high, all the intake and exhaust valves can be simultaneously sucked, so that the suction time of the intake and exhaust valves can be shortened, and early start-up is possible.

Further, since the load on the battery at the time of suction of the intake / exhaust valve is reduced, a decrease in the number of revolutions of the starter motor is prevented, and good starting performance can be obtained.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of an electromagnetic valve drive control device according to a first embodiment.

FIG. 2 is a configuration diagram of the same driving circuit.

FIG. 3 is a flowchart showing a start-time control routine;

FIG. 4 is a flowchart showing a valve suction subroutine of the same.

FIG. 5 is a main part flowchart showing a start-time control routine according to another embodiment;

[Explanation of symbols]

 1: Electromagnetic drive valve 4: Intake / exhaust valve

Claims (3)

[Claims] An electromagnetically driven valve for controlling the drive of an intake / exhaust valve interposed in an intake / exhaust port of an engine by an electromagnetic coil and sucking all of the intake / exhaust valve to a fully open side or a fully closed side before starting the engine. Before starting the engine, the number of the intake and exhaust valves to be simultaneously sucked is set based on a parameter indicating the battery output capacity, and the intake and exhaust valves are sequentially sucked according to the number of valves. Start-up control device. 2. The control device according to claim 1, wherein the parameter indicating the battery output capability is a battery voltage. 3. The control device according to claim 1, wherein the parameter indicating the battery output capability is a temperature around the battery.