JPH01163443A - Internal combustion engine control device - Google Patents

Abstract

PURPOSE:To enable control of an ignition position and a valve for control in relation to both a rotation speed and a throttle opening, by a method wherein an ignition position and the target opening of the valve are computed by means of throttle opening information and rotation speed information. CONSTITUTION:A throttle opening detector 10 to continuously detect the opening of a throttle valve and a valve opening detector 7 to detect the opening of a valve for control are provided. Outputs from the two detectors 10 and 7 are fed as throttle opening information and valve for control opening information through an analogue digital converter 8a to a computer 80. An ignition position valve opening computing means computes an ignition position and the target opening of a valve by means of throttle opening information and rotation speed information. Thus, since the ignition position of an internal combustion engine and the opening of a valve can be controlled in relation to both a rotation speed and a throttle opening, performance of an engine can be improved.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an ignition device for an internal combustion engine that uses a microcomputer to control the ignition position of the internal combustion engine and the exhaust control valve and intake valve of the engine. be.

[Prior Art] Recently, in order to improve the output and fuel efficiency of internal combustion engines, it is required to accurately control the ignition position, so ignition devices that control the ignition position using a microcomputer are often used. Now you can.

In a conventional ignition device that calculates the ignition position using a microcomputer, one rotation period is divided into a rotation speed detection period, an ignition position calculation period, and an ignition position measurement period, and the ignition position is calculated based on the length of the rotation speed detection period. The rotational speed is detected, and then the ignition position at each rotational speed is calculated between ignition position calculation and stationary, and in the ignition position measurement period, clock pulse counting is started from the reference position and a predetermined number of clock pulses corresponding to the ignition position are calculated. When the pulses were counted, a signal was obtained to determine the ignition position.

[Problems to be Solved by the Invention] In the conventional ignition device, it is necessary to divide one revolution into a rotation speed detection period, an ignition position calculation period, and an ignition position measurement period. This requires multiple balsa coils to generate a signal indicating the signal, which poses a problem in that the configuration of the signal generator becomes complicated.

Furthermore, in order to fully demonstrate the performance of an internal combustion engine, it is not enough to simply control the ignition position relative to the rotational speed.
The ignition position is also controlled with respect to the throttle opening, so that when the throttle opening is large and the mixed gas flow rate is large, the ignition position is retarded, and when the throttle valve opening is small (the mixed gas flow M is small), the ignition position is retarded. ) It is desirable to advance the ignition position as much as possible.

In order to further improve the performance of the engine,
As seen in No. 9, by installing an exhaust control valve to control the exhaust timing at the top of the exhaust passage of a two-stroke internal combustion engine and controlling the valve according to the rotation speed, it is possible to reach the upper limit of the rotation speed. By advancing the exhaust timing and adjusting the muffler's resonant frequency by providing an exhaust control valve and controlling this valve according to the rotational speed, the muffler's resonant frequency can be increased as the rotational speed increases. There are many things being done.

It is also practiced to control the intake valve according to the rotational speed so that the mixture ratio of air and fuel decreases as the rotational speed increases.

In these cases as well, it is not sufficient to simply control the valve opening according to the rotational speed, but it is desirable to control the valve opening with respect to both the rotational speed and the throttle opening.

In the Naoki specification, the valve that adjusts the exhaust timing and the valve that adjusts the muffler's co-operation frequency are both referred to as "exhaust control valves" in the sense of valves that control the exhaust of the internal combustion engine.

Furthermore, the term "control valve" is used to include both exhaust control valves and intake valves.

An object of the present invention is to provide an internal combustion engine control device that can control the ignition position and the opening degree of a control valve with respect to both the rotational speed and the throttle opening degree.

Means for Solving Problem L] The configuration of the present invention will be described with reference to FIG. 1. The present invention
An ignition circuit 3 that controls the primary current of an ignition coil 2 to obtain a high voltage for ignition through the operation of a primary current control semiconductor switch 1 that operates when a trigger signal is applied;
An actuator 5 that operates a control valve 4 that controls 11 tA intake or exhaust, an actuator drive circuit 6 that drives the actuator, a valve opening detector 7 that detects the opening of the fl and l111 valves, and a microcomputer. In order to apply a trigger signal to the primary current control semiconductor switch 1 at the calculated ignition position by calculating the ignition position at each rotational speed and the target opening degree of the valve 4, the opening degree of the valve approaches the target opening degree. In this internal combustion engine control device, the ignition position and the opening of the control valve are controlled with respect to both the rotational speed and the throttle opening. It is designed so that it can be controlled by

Therefore, in the present invention, the low-speed ignition position signal ES1 becomes equal to or higher than the threshold level at a position corresponding to the ignition position in the low-speed region near the starting rotational speed of the internal combustion engine, and the low-speed ignition position signal The balsa coil 9 outputs a first interrupt signal ES2 that exceeds the threshold level at a position where the phase is advanced from the position where the threshold level is exceeded, and the r# degree of the throttle of the internal combustion engine is continuously detected. The throttle opening detector 10 is also provided.

The ignition position valve opening degree control device 8 includes a valve opening degree detector 7
and the output of the throttle opening detector 10 into digital signals, respectively, and output control valve opening information and thrower 1 interlayer opening information.
a, ignition position valve opening calculation means 8b which calculates the ignition position and target opening of the valve based on the given rotational speed information and throttle opening information; An operation of interrupting the operation of the valve opening calculation means 8b to take in the count value of the first timer 8C that is counting clock pulses as the rotational speed information, and an operation of resetting the first timer 8C. The first interrupt processing means 8C performs the operation of accumulating already calculated ignition position information in the first register 8d, and the count value of the first timer 8C is compared with the contents of the first register 8d. and a first comparator 8f that generates a second interrupt signal when the two match, and a second comparator that interrupts the operation of the ignition position valve opening calculation means 8b when the second interrupt signal is generated to generate the ignition during steady operation. a second interrupt processing means 8q that generates a position signal; a trigger signal output circuit 8h that provides a trigger signal to the thyristor when either the ignition position signal during steady operation or the ignition position 2 signal during low speed is generated; A second register 81 that stores a count value of clock pulses corresponding to the sampling time of the opening degree of the valve, a second timer 8j that counts clock pulses, a count value of the second timer, and the contents of the second register. and a third interrupt signal having a second comparator 8 and a second comparator 8 for generating a third interrupt signal each time the second timer counts the number of clock pulses stored in the second register. The generating means 8m and the operation of the ignition position valve opening calculating means 8b are multiplied by v1 every time the third interrupt signal is generated to convert the valve opening given by the control valve opening information to the target opening. The third interrupt processing means 8n provides the drive signal necessary for approaching the actuator drive circuit 6.

[Operation of the invention] As described above, the first interrupt signal and the low-speed ignition position signal are obtained from the balsa coil, and each time the first interrupt signal is generated, rotational speed information is taken in, and this first interrupt signal is obtained. Measurement of the ignition position is started based on the generation position of the first interrupt signal. With this configuration, multiple pulsar coils are not required, unlike conventional ignition systems that divide one revolution into an ignition position calculation interval and an ignition position measurement interval, so the configuration of the signal generator can be changed. It can be done easily.

Furthermore, in the present invention, a throttle opening degree detector that continuously detects the opening degree of the throttle valve and a valve distance detector that detects the opening degree of the control valve are provided, and the outputs of both detectors are Throttle opening information and control valve opening information are provided to the microcomputer through a digital converter, and the ignition position l valve opening calculation means determines the ignition position and valve opening information based on the throttle opening information and rotational speed information.
1A opening degree is calculated. Therefore, the ignition position of the internal combustion tsPA and the opening degree of the control valve can be controlled with respect to both the rotational speed and the throttle opening degree, and the performance of the engine can be improved.

[Example] The present invention will be described in detail below with reference to the accompanying drawings.

FIG. 2 shows the overall configuration of an embodiment of the present invention that realizes the configuration shown in FIG.

In the present invention, the ignition position is adjusted according to the rotational speed and throttle opening degree, and at the same time, the control valve that adjusts the exhaust timing, the resonance frequency of the muffler, or the mixture ratio of fuel and air is controlled. In the following description, it is assumed that a control valve provided at the upper part of the exhaust passage is controlled to adjust the exhaust timing of a two-stroke engine, and that when the control valve is queried, the exhaust timing advances.

In this embodiment, a capacitor discharge type circuit is used as the ignition circuit 3. The ignition coil 2 has a primary coil 2a and a secondary coil 2b, and one ends of the primary coil 2a and the secondary coil 2b are grounded. A spark plug P attached to a cylinder of an engine (not shown) is connected to the secondary coil 2b of the ignition coil. An ignition energy storage capacitor C1 is connected to the non-grounded terminal of the primary coil 2a of the ignition coil.
One end of the capacitor C1 is connected to the capacitor C1, and a cyrisk S1 constituting the primary current control semiconductor switch 1 is connected between the other end of the capacitor C1 and ground. The other end of the capacitor C1 is also connected to the cathode of a diode D1.
An exciter coil 1x is connected between the anode of 1 and the ground. Further, a diode D2 with its cathode facing the ground side is connected to both ends of the primary coil of the ignition coil.

The exciter coil X is provided in a magnet generator attached to the internal combustion engine, and outputs positive and negative half-cycle voltages Ve1 and Ve2 in synchronization with the rotation of the engine.

In this example, exciter coil Lx→diode D1→
A capacitor charging circuit that charges the ignition energy storage capacitor C1 is configured by the circuit of capacitor C1 → diode D2 and the primary coil 2a of the ignition coil → exciter coil L×, and the positive half cycle output voltage of exciter coil L× (2) By e1, the ignition energy storage capacitor C1 is charged to the polarity shown in the figure through this capacitor charging circuit. Thyristor S1 at the ignition position of the internal combustion engine
When a trigger signal is supplied to the gate of the thyristor, the thyristor becomes conductive, and the charge in the capacitor C1 is discharged to the primary coil of the ignition coil through the thyristor S1. As a result, a high voltage is induced in the secondary coil of the ignition coil, a spark is generated in the ignition plug P, and the engine is ignited.

Reference numeral 5 denotes an actuator that operates a control valve that adjusts the exhaust timing of the internal combustion engine. In this example, the actuator 5 uses an electric IM as its driving source.

Reference numeral 6 denotes an actuator drive Oj circuit that supplies a drive current to the actuator 5 in accordance with a drive number ffi given from a control device, which will be described later. The output voltage of the battery 8 is applied to both ends of the bridge circuit of Tr1 to Te3. In this drive circuit, when the drive signal e old is applied to the base of the transistor Trt, the transistors Tr1 and T
r2 conducts, causing a unidirectional armature current to flow through the motor M,
The electric motor is rotated forward. Also, when the drive signal ed2 is applied to the base of the transistor Tr3, the transistor Tr
3 and Tr4 conduct, and an armature current flows in the opposite direction to the above direction to the motor M, causing the motor to reverse. The control valve is operated in the closing direction and the closing direction by the forward rotation and reverse rotation of the electric motor M, respectively.

8 is the thyristor S1 using a microcomputer.
This is an ignition position valve opening control device that controls the position (ignition position) at which a trigger signal is given to the engine and the opening degree of the control valve. 9 output signal E31. ES2
and the output signal E of the valve opening detector 7 which detects the opening of the control valve from the rotation angle of the output shaft of the actuator 5.
V1 and the output signal EV2 of the throttle opening detector 10 that continuously detects the opening of the throttle valve of the internal combustion engine as input, and a microcomputer calculates the ignition position of the internal combustion engine and the target opening of the valve, A trigger signal et is given to the thyristor S1 at the calculated ignition position, and a drive signal ed1 or e is given to the actuator drive circuit 6, which is necessary to bring the opening degree of the control valve closer to the target opening degree.
Give d2.

The pulsar coil 9 is provided within a signal generator attached to an internal combustion engine. This signal generator consists of, for example, a signal generator having a reluctor (inductor) that rotates in synchronization with the output shaft of the engine, a pulser coil, and a magnet that flows magnetic flux through the pulser coil, and each time the signal generator faces the reluctor. Poly-like signals Es1 and ES2 are induced in FIG. 10 (Δ). Of these signals, ESl is the ignition position in the low speed range near the starting rotation range of the internal combustion engine (usually the minimum advance position)
Es2 is a low-speed ignition position signal that exceeds the threshold level at a low speed, and Es2 is a low-speed ignition position signal that exceeds the threshold level at a position where the phase is advanced by a predetermined angle from the position where the ignition position signal ES1 exceeds the threshold level. This is the first interrupt signal. In this embodiment, the first interrupt signal ES
The position where 1 is equal to or higher than the threshold level is set to a position slightly advanced in phase from the maximum advance position of the internal combustion engine.

When the internal combustion engine is a raw cylinder and the ignition operation is performed only once per revolution, one reluctor is used and the signals ESI and Es2 are generated in the pulsar coil only once. In addition, when ignition is performed twice per revolution at 180 degree intervals like in a two-cylinder internal combustion engine, two reluctors are arranged symmetrically 180 degrees apart, and a signal ES1 is sent to one pulser coil.
and ES2 are generated twice per rotation.

The illustrated valve opening detector 7 is composed of a potentiometer having fixed terminals 7a and 7b led out from both ends of a resistor and a movable contact 7c that makes sliding contact with the resistor. A constant DC voltage Vcc is applied from a power supply circuit (not shown) whose power source is . The movable contact 7C of this detector is provided so as to be interlocked with the output shaft of the actuator 5, and a valve opening detection signal EV1 proportional to the opening of the control valve is generated between the movable contact 7C and the fixed terminal 7b. It is now possible to obtain it.

The throttle opening detector 10 is composed of a potentiometer that connects fixed terminals 10a and 10b led out from both ends of a resistor and a movable contact that makes sliding contact with the resistor, and a power supply circuit is connected between the fixed terminals 10a and 10b. A constant DC voltage Vcc is applied. The movable contact 10C is provided to interlock with the throttle valve, and a throttle opening detection signal EV2 proportional to the opening of the throttle valve is obtained between the movable contact 10c and the fixed terminal 10b.

Referring next to FIG. 3, the configuration of the ignition position control device 8 is shown. In the figure, reference numeral 80 denotes an analog-to-digital converter (A/D converter) Ba, a first timer 8C1, a first register 8d, a first comparator 8'', a second timer 8j, a second register 81, and a second The comparator 8 includes an interrupt control circuit 80a, a random access memory (RAM) 80b that stores various data given from time to time, and a read-only memory (R) that stores a predetermined program.
This is a microcomputer with OM>80c, and a third interrupt signal generating means 8m is constituted by a second timer 8j, a second register 81, and a second comparator 8k.

81 is a low speed ignition position signal E generated by the balsa coil 9
A low-speed ignition position signal waveform shaping circuit that shapes the waveforms of S1 and the first interrupt signal Es2 into pulse shapes, respectively;
With the interrupt signal waveform shaping circuit, the low-speed ignition position signal ES
t and external interrupt signal ES2 are converted into pulse signals Epl and Ep2 by these waveform shaping circuits, which rise at the ignition position at low speed and at a position whose phase is more advanced than the ignition position, respectively.
is converted to

Output pulse Ep2 of the first interrupt signal waveform shaping circuit 82
is input to the reset terminal r of the flip-flop circuit 83, and the output pulse Epl of the low-speed ignition position signal waveform shaping circuit 81 is input to the set terminal S of the flip-flop circuit 83. The signal EQ obtained at the positive logic output terminal Q of the flip-flop circuit 83 is input to the interrupt control circuit 80a, and at the falling edge of the signal obtained at the output terminal Q of the flip-flop circuit, an interrupt signal IN is sent to the interrupt control circuit 80a.
1 is given.

Output E of positive logic output terminal Q of flip-flop circuit 83
q is also input to the NOT circuit 84, and the output [q of the N07 circuit is input to the AND circuit 85.

The microcomputer 80 is driven by a constant voltage power supply circuit powered by battery B, and when the power is turned on, R
Execute the program stored in OM from address O. Note that the output of the power supply circuit drives the microcomputer.
When the value of 57 has not been reached, the micro combi coater is held in a reset state.

The microcomputer 80 includes boats A to C. Boats A-C are switched to input ports 1 when the microcomputer is in the reset state, and switched to output ports when the microcomputer is powered on and the computer is ready for operation. The port Δ is connected through a pull-up resistor 86 to the output terminal of a constant voltage power supply circuit (not shown) using battery B as a power source, and is also connected to the input terminal of a NOT circuit 87, and the output f of the N07 circuit 87, a is input to the AND circuit 85.

As mentioned above, when the microcomputer is operating, the steady-state ignition position signal ef with a logic state of "1" is output to the output side of the AND circuit 85 at the ignition position during steady-state operation. The output of this AND circuit 85 is combined with the output signal of the low-speed ignition position signal waveform shaping circuit 81 to an OR circuit 8.
8, and when the steady-operation ignition position signal ef is obtained on the output side of the AND circuit 85 or when the pulsar coil 9 outputs the low-speed ignition position signal ES1, the gate of the thyristor S1 in FIG. A trigger signal et can be obtained at the same time. In this example, the OR circuit 88 constitutes a trigger signal output circuit 8h.

Boats B and C are connected to the bases of transistors Tr1 and Tr3 of the actuator drive circuit 6, and when the motor M of the actuator is rotated in the forward direction, the logic states of the boats B and C become "1" and rOJ, respectively, and the motor When M is reversed, the logic states of ports B and C become "0" and "1", respectively.

The output signal IEV1 of the valve opening detector 7 and the output signal EV2 of the throttle opening detector 10 are
Digital cliff control valve opening information D1 and throttle opening information D are input to input terminals ANI and AN2 of a.
2 and stored in the RAM in the microcombi 1-1.

In the microcomputer 80, a predetermined program stored in the ROM implements an ignition position valve interlayer calculating means and first to third interrupt processing means (see FIG. 1).

The ignition position valve opening calculation means 8b shown in FIG.
The ignition temperature and target opening of the valve are simulated with respect to the rotational speed and throttle opening based on the performance formula stored in .

For example, the throttle opening is 0-25%, 25-50%.

In such a manner that the characteristics of the ignition position with respect to the rotational speed N are changed as shown by the broken lines a, b, c, and d in FIG.
The ignition position is controlled with respect to both rotational speed and throttle opening.

Also, as shown in Fig. 12, the throttle opening is 0 to 25.
%, 25 to 50%, 50 to 75%, and 75 to 100%, so as to avoid changing the characteristics of the control valve opening with respect to the rotational speed N as shown in broken lines a to d in Fig. 12. Next, the opening degree of the control valve is controlled with respect to both the rotational speed N and the throttle opening degree.

The ignition position valve opening calculation means 8b is realized by the main routine MAIN of the program stored in the ROM. A flowchart showing the algorithm of this deception means is shown in FIG.

When the main routine MAIN is started, each data stored in the RAM is first initialized, and then the throttle opening information D2 obtained from the A/D converter 8a is converted into the current throttle opening value data. It is stored in the RAM as ■.

In the ROM of the microcomputer, there is an arithmetic expression f that determines the ignition position θig as a function of the throttle opening data ■ and the rotational speed data Ne given in another routine.
(Me, V) and an arithmetic expression g (Me, V) for calculating the target opening degree θa of the exhaust valve or intake valve as a function of the throttle opening degree data V and the rotational speed data NO are stored. The ignition position θig and the target valve opening θa are calculated using the rotational speed data NC, the throttle opening data V, and these calculation formulas. These data are stored at predetermined addresses in the RAM.

After the ignition position θig and the target valve opening θa are calculated, the throttle opening information D2 is again read from the Δ/D converter, and the same operation is repeated thereafter.

In the ignition position valve opening degree control device described above, the rotational speed data Ne is taken in as follows.

When the balsa coil 9 outputs the first interrupt signal ES2, the flip-flop circuit 83 is reset, so the positive logic output Eq of the 7-lip 70-tub circuit falls to zero, as shown in FIG. 10(B). At this falling edge, the interrupt signal INI is applied to the interrupt control circuit 80a. As a result, the main routine of FIG. 6 is interrupted at the end of the step being executed, and the interrupt routine 1NT1 of FIG. 7 is executed to implement the first interrupt processing means. In this interrupt routine, first, the logic state of the output [a of boat A is set to ``1'' (see Figure 10), and then the count value of the first timer 8C is stored in the RAM as rotational speed data No. This rotational speed data is calculated from the generation of the previous first interrupt signal ES2 to the current first interrupt signal E.
This is the count value of the clock pulses counted by the first timer 8C until S2 occurs, and it becomes smaller as the rotational speed of the engine becomes higher, and becomes larger as the rotational speed becomes lower. Therefore, this rotational speed data Ne has a one-to-one correspondence with the engine rotational speed, and based on this data, one ignition position can be calculated for each rotational speed. After storing the count value of the timer in the RAM as rotation speed data NO., the first timer 8
G is reset and the timer starts a new count.

Next, the contents of the ignition position data θig already calculated in the main routine (ignition position valve opening calculation means) of FIG. 6 are transferred to the first register 8d, and then the side-in routine is ended. The ignition position data given to the register 8d is set to H1 by the timer 8C while the engine crankshaft rotates from the position where the external interrupt signal ES2 is generated to the ignition position.
The number of clock pulses counted is equal to 31.

When the interrupt routine shown in Fig. 7 is completed, execution of the main routine shown in Fig. 6 is resumed, and the calculation of the target opening degree of the ignition (device and valve) is restarted. It means going back to the next step after the last step.

When the ignition position data θig is transferred to the first register 8d by the interrupt routine shown in FIG. 7, the first comparator 8f compares the contents of the register 8d with the count value of the timer 8C, and When matches the contents of the register 8d, the comparator 8f generates an interrupt l+control circuit 8.
A second interrupt signal IN2 is given to 0a. As a result, the second interrupt routine INT2 shown in FIG. 8 is executed.
A second interrupt processing means is implemented. In this interrupt routine, boat A's :tsl! The l state is set to "0", and then the process returns to the main routine of FIG.

In the point ambassador 1i5 ill t11 device shown in FIG. 3, the first interrupt signal ES2 is generated (the generation position of the interrupt signal ES2 is set to a position slightly advanced in phase from the maximum advance angle position). ) Since the flip-flop circuit 83 has been reset, the ignition position at low speed has changed '5Es1.
The logic state of the output "q" of the N07 circuit 84 is "1" until the flip-flop circuit 83 is set after the occurrence of "Q". When the logic state of the output of boat A [a is "1", the output of the NOT circuit 87 "the logic state of a is "0"
Therefore, the output of the AND circuit 85 is "0". When the logic state of the output Ea of boat A (see Fig. 10) becomes "0" at the ignition position calculated by the microcomputer, the logic state of the output Ea of the NOT circuit 87 (see Fig. 10 E) becomes "1". , the steady-state ignition position signal ef is sent to the output side of the AND circuit 85 (see Fig. 10F).
is obtained. When the low speed n signal ES1 is generated and the output Eq of the flip-flop circuit 83 becomes "1", the output of the AND circuit 85 becomes rOJ. The output of the OR circuit 88 is the pulse signal 5Ep1 (
It becomes ``1'' when a condition (see FIG. 10G) is occurring. Therefore, the waveform of the trigger signal get applied to the gate of the thyristor S1 during steady operation is as shown in FIG. 10(H).

In this embodiment, the microcomputer is held in a reset state when the output of the power supply circuit using battery B as a power source does not reach a level sufficient to drive the microcomputer. When the microcomputer is in the reset state, boat A is set as the input port and the logic state of its output Ea is kept at "1", so the output of the AND circuit 85 is kept at "0". At this time, a trigger signal et is applied to the thyristor S1 through the OR circuit 88 by the output pulse El)1 of the waveform shaping circuit 81.

In the control device shown in FIG. 3, the sampling time of the valve opening (for example, (0,51s
A count value of clock pulses corresponding to eC) is stored. The second timer is counting clock pulses,
The second comparator 8 contains the second timer argument value and the second timer argument value.
The interrupt control circuit 8 compares the contents of the register 81 of
A third interrupt signal IN3 is given to 0a.

When this third interrupt signal occurs, the interrupt control circuit 8
0a interrupts the main routine and causes the interrupt routine INT3 shown in FIG. 9 to be executed, thereby realizing the third interrupt processing means 8n shown in FIG.

In the interrupt routine shown in FIG. 9, first the second timer 8
j is reset, and then the control valve opening degree information D1 is taken into the RAM as the current value θ of the valve opening degree. Next, the target opening degree θ of the control valve that has been calculated in the main routine
The current value θ of the valve opening degree is reduced or exempted from a, and the result is taken into the RAM as the deviation θ'. When the deviation θ' is positive, the deviation is compared with a constant value θ0 stored in advance in the ROM. If θ' is larger than θ0, the logic state of boat B is set to "1", and the logic state of boat C is set to "1". The drive signal edl is applied to the 1-herald transistor Trl of the actuator drive circuit 6 with the logic state being rOJ. At this time, transistors Tr1 and l
” r2 becomes conductive, and the actuator [-ta M is rotated in the forward direction to open the control valve. Also, the deviation θ'
When is less than 00, both boats B and C are set to "0".
Then, the supply of the drive signal to the actuator drive circuit 6 is stopped.

When the deviation θ' is negative, after reversing the sign of the deviation,
θ' and θO are compared, and when the difference θ' is larger than θO, boats B and C are set to "0" and "1", respectively.
and the transistor Tr3 of the actuator drive circuit 6
The drive e signal ed2 is applied to the drive e signal ed2. At this time, transistor Tr3
and Tr4 conduct, causing the actuator motor M to rotate in reverse. When the deviation θ' is less than or equal to θO, both ports B and C are set to “0” and the supply of the drive signal to the actuator drive circuit 6 is stopped.

In this way, the actuator motor is rotated forward or reverse depending on the sign of the deviation θ', and the opening degree of the control valve is brought closer to the target opening degree.

θ0 is data to provide a dead zone for the control operation of the control valve, and when the deviation θ' is less than θ0 (when it is in the dead zone)
The control valve is not operated during this period, thereby preventing the control valve from moving back and forth around the target opening degree and making the control operation unstable.

In the above embodiment, the ignition position valve opening degree control device 8 is operated by a power supply circuit using battery B as a power source, but as shown in FIG. A power supply circuit 11 that outputs a voltage may be provided, and the ignition position valve opening control device 8 may be driven by the output of the power supply circuit 11. In the circuit shown in FIG. 4, a diode D3 with its anode facing the ground is inserted between one end of the exciter coil lx and the ground, and the anode of the diode D4 is connected to the terminal of the exciter coil LX on the diode D3 side. There is. A power supply capacitor (JC2) is connected between the cathode of the diode D4 and the ground, and a thyristor S2 is connected across the series circuit between the diode D4 and the capacitor C2.The capacitor C
A voltage dividing circuit consisting of a series circuit of resistors R3 and R4 is connected to both ends of the voltage dividing circuit 2, and a voltage dividing point of the voltage dividing circuit is connected to the gate of the thyristor S2 through a Zener diode Z1. Further, a diode D5 with its anode facing the ground side is connected between the non-grounded terminal of the exciter coil X and the ground. A power supply circuit 11 is constituted by a power supply capacitor C2, diodes D4 and D5, a thyristor S2, resistors R3 and R4, and a Zener diode Z1, and the voltage across the power supply capacitor C2 is applied to the power supply terminal of the control device 8. The terminal voltage of the power supply capacitor C2 is also input to the reset circuit 12, and when the output voltage of the power supply circuit 11 does not reach the voltage required to operate the ignition position valve opening control device 8 (especially the microcomputer), the microcomputer The microcomputer is maintained in a reset state by applying a reset signal to the microcomputer. The configuration of the ignition position valve opening degree control device 8 is similar to that of the previous embodiment.

In the case of the configuration shown in FIG. 4, when the rotational speed of the engine is low and the output voltage of the power supply circuit 11 has not reached the value required for normal operation of the microcomputer, the microcomputer It is held in a reset state. A trigger signal for determining this instant ignition position is given by a low speed instant ignition position signal output from the pulser coil 9. When the engine starts and its rotational speed exceeds a certain level (usually around 800 rpm), the power supply capacitor C
Since the voltage at the terminal 2 reaches a value that allows the microcomputer to operate normally, the reset of the microcomputer is released and the microcomputer executes the program stored in the ROM from address O.

FIG. 5 shows another configuration example of the power supply circuit 11. In this example, the terminal opposite to the diode D1 of the exciter coil is grounded, and the ignition energy storage capacitor C1 and the terminal of the ignition coil 2 are grounded. A diode D6 with its anode facing toward the ignition coil is inserted between it and the next coil. The anode of a diode D7 is connected to the connection point between the capacitor C1 and the cathode of the diode D6, and the power supply capacitor C2 is connected between the cathode of the diode D7 and the ground through a diode D4.

The rest of the configuration of the power supply circuit 11 is the same as the example shown in FIG.

In the example shown in FIG. 5, the positive half-cycle output of exciter coil 2 causes capacitor C1 and capacitor to connect to capacitor C1 and capacitor in the path of exciter coil LX → diode D1 → capacitor C1 → diode D7 → diode D4 → capacitor C2 → exciter coil LX. +JC2 is charged. Here, the capacitance of the capacitor C2 is set to be sufficiently larger than the capacitance of the capacitor C1, so that the ignition energy stored in the capacitor C1 will not be insufficient.

The configuration of the power supply circuit 11 is not limited to the example shown in FIGS. 4 and 5, and the power supply capacitor C2 is charged to one polarity by the output of the exciter coil Lx, and the voltage across the power supply capacitor is kept constant. Any circuit may be used as long as it is equipped with constant voltage means to maintain the voltage. For example, a power supply circuit having a configuration similar to that shown in the above embodiment is connected in parallel to the exciter coil lx, and the positive half cycle output of the exciter coil is used to connect the power supply circuit to the power supply capacitor without going through the ignition energy storage capacitor C1. C2 may be charged. Power supply capacitor C2 is used as a constant voltage means.
A Zener diode connected in parallel may also be used.

In the above embodiment, the second timer constituting the third interrupt signal generating means is reset by the third interrupt processing means.
The second timer may be reset by the interrupt signal.

In the above embodiment, the speed of the motor M of the actuator 5 is not controlled, but in order to accurately control the opening degree of the control valve, the speed of the motor M of the actuator 5 is controlled and the control valve is It is preferable to reduce the speed of the motor M when the fm degree approaches the target value. To do this, for example, the past values of the four control valve distance information obtained by digitally converting the output signal of the valve opening detector are stored in RAM, and the past information and the current control valve The motor speed is determined from the size of the deviation from the opening information, and as the deviation becomes smaller, the motor M
The driving current of the motor may be reduced by reducing the conduction angle of the driving current.

In the above embodiment, an actuator using a motor as a driving source is used, but an actuator using a plunge V-shaped electromagnet or the like as a driving source may also be used.

In the above embodiment, the output of the ignition coil 2 is supplied to the spark plug of a single cylinder, but both ends of the ignition coil 2 are connected to the non-ground terminals of the two spark plugs, so-called "simultaneous ignition". In addition, the rotor of the signal generator is equipped with two pulser coils at 180 degree intervals.
By providing two reluctors (inductors) and configuring the pulser coil 9 to generate signals twice at intervals of 180 degrees per revolution, the output of one ignition coil can be used to control two cylinders at 80 degrees.
It can also be lit at intervals of degrees.

[Effects of the Invention] As described above, according to the present invention, the first
obtains an interrupt signal and a low-speed ignition position signal, captures rotational speed information every time the first interrupt signal is generated, and measures the ignition position based on the generation position of the first interrupt signal. , unlike conventional ignition systems in which one rotation period is divided into an ignition position calculation period and an ignition position measurement period, there is no need for multiple pulsar coils, and the configuration of the signal generator is simplified. There are advantages that can be achieved.

Further, according to the present invention, a throttle angle detector that continuously detects the opening of the throttle valve and a valve opening detector that detects the opening of the control valve are provided, and the output of the rain detector is converted into an analog signal. Throttle opening information and control valve opening information are provided to the microcomputer through a digital converter, and the ignition position valve opening calculation means calculates the ignition position and target valve opening based on the throttle opening information and rotational speed information. Since the calculation is performed, the ignition position of the internal combustion engine and the opening degree of the control valve can be controlled with respect to both the rotational speed and the throttle opening degree, which has the advantage of improving engine performance. There is.

[Brief explanation of the drawing]

Figure 1 is a configuration diagram showing the basic configuration of the present invention, and Figure 2 is a diagram showing the basic configuration of the present invention.
FIG. 3 is a block diagram showing the configuration of the ignition position valve opening control device of the embodiment shown in FIG. 2, and FIGS. FIG. 6 is a circuit diagram showing different modifications of the power supply circuit that can be used in the invention; FIG. 6 is a flowchart showing the algorithm of the ignition position valve opening calculation means in the embodiment shown in FIGS. 1 and 2; FIG. 8 are flowcharts showing the algorithm of the first and second interrupt processing means used in the same embodiment, FIG. 9 is a flowchart showing the algorithm of the third interrupt processing means, and FIG. 10 is a flowchart showing the algorithm of the second and second interrupt processing means used in the same embodiment. 3 is a waveform diagram showing the signal waveform of each part, FIG. 11 is a diagram showing an example of the ignition characteristic when switching the ignition characteristic with respect to the rotation speed into four stages according to the opening degree of the throttle valve,
FIG. 12 is a diagram illustrating an example of a characteristic in the case where the control valve i, lJ control characteristic with respect to rotational speed is switched to four stages according to the opening degree of the throttle valve. DESCRIPTION OF SYMBOLS 1... Semiconductor switch for primary current control, 2... Ignition coil, 3... Ignition circuit, 4... Control valve, 5
Actuator, 6 Actuator drive circuit, 7 Valve opening detector, 8 Ignition position valve opening control device, 8a Analog-to-digital converter,
8b... Ignition position valve opening calculation means, 8C... First timer, 8d... First register, 8e... First interrupt processing means, 8f... First comparator,
8g...Second interrupt processing means, 8j...Second timer, 81...Second register, 8k...Second comparator, 8m...Third interrupt signal generation means, 8
0... Microcomputer, 9... Parna coil, 10... Throttle opening detector. Figure 4 Figure 5 @ Figure 6 Figure 7 Figure 8 Figure 1 Figure 9 Figure 1O Figure

Claims (1)

[Scope of Claims] An ignition circuit that controls the primary current of an ignition coil to obtain a high voltage for ignition by operating a primary current control semiconductor switch that operates when a trigger signal is applied; An actuator that operates a control valve that controls intake or exhaust, an actuator drive circuit that drives the actuator, a valve opening detector that detects the opening of the control valve, and a microcomputer that controls the ignition at each rotation speed. A trigger signal is given to the primary current control semiconductor switch at the ignition position calculated by calculating the position and the target opening degree of the control valve, and the opening degree of the control valve is brought close to the target opening degree. and an ignition position valve opening control device that applies a drive signal to the actuator drive circuit, wherein the ignition position is equal to or higher than a threshold level at a position corresponding to an ignition position in a low speed region near the starting rotational speed of the internal combustion engine. a pulsar coil that outputs a low-speed ignition position signal that becomes equal to or higher than a threshold level, and a first interrupt signal that becomes equal to or higher than a threshold level at a position where the phase is advanced from a position where the low-speed equal to ignition position signal becomes equal to or higher than a threshold level; a throttle opening detector that continuously detects the throttle opening of the internal combustion engine, and the ignition position valve opening control device includes: an output of the valve opening detector and an output of the throttle opening detector. An analog-to-digital converter converts the output into digital signals and outputs control valve opening information and throttle opening information, and converts the ignition position and control valve based on the given rotational speed information and throttle opening information. ignition position valve opening calculation means for calculating a target opening; and a first interrupt signal for counting clock pulses by interrupting the operation of the ignition position valve opening calculation means every time the first interrupt signal is generated. a first timer that performs an operation of taking in the counted value of the first timer as the rotational speed information, an operation of resetting the first timer, and an operation of accumulating already calculated ignition position information in the first register; an interrupt processing means; a first comparator that compares the count value of the first timer with the content of the first register and generates a second interrupt signal when the two match; and the second interrupt signal; a second interrupt processing means that interrupts the operation of the ignition position valve opening calculating means to generate a steady-state ignition position signal when a signal is generated; and the steady-state ignition position signal or the low-speed ignition position a trigger signal output circuit that provides a trigger signal to the thyristor when any of the signals is generated; a second register that stores a counted value of clock pulses corresponding to the sampling time of the opening degree of the control valve; a second timer for counting, and a second comparator for comparing the count value of the second timer with the contents of the second register, the second timer counting the number stored in the second register; a third interrupt signal generating means that generates a third interrupt signal every time a clock pulse is counted; and a third interrupt signal generating means that interrupts the operation of the ignition position valve opening calculation means every time the third interrupt signal is generated. and third interrupt processing means for supplying the actuator drive circuit with a drive signal necessary for bringing the opening degree of the control valve given by the control valve opening degree closer to the target opening degree. Characteristic internal combustion engine control device.