JP3460195B1 - Method and device for stopping ignition device for internal combustion engine - Google Patents

Abstract

An internal combustion engine can be stopped easily, reliably, and safely, so that it is easy to handle and implement, can exhibit high fail-safe, and has a large number of parts to be used. To reduce costs. SOLUTION: When a forward voltage of an output voltage of a power generation coil reaches a cycle detection voltage value at which a continuous ignition operation can be obtained, a cycle detection signal is generated, and a time between adjacent cycle detection signals is determined. In a capacity discharge type internal combustion engine igniter that detects a rotational speed and outputs an ignition signal to a discharge switching element when necessary, a short circuit between a power generation coil and ground disables generation of a cycle detection signal, and detects the last cycle. If the time from the signal exceeds the stop time set as a time shorter than the short circuit time and longer than one cycle, the ignition signal is continuously output to disable the ignition operation, simple operation, reliable and safe Get a stop action.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a device for stopping an ignition device for a capacity discharge type internal combustion engine in which ignition timing is controlled by a microcomputer.

[0002]

2. Description of the Related Art As a stopping means of an internal combustion engine ignition device, a stop switch is connected in parallel with a power generation coil, and the stop switch is manually turned on to short-circuit both terminals of the power generation coil to perform an ignition operation. It is known to disable the internal combustion engine and thus stop the operation of the internal combustion engine.

This stopping means using only the manual stop switch is easy to stop when the stop switch is a push button type self-resetting normally open contact type switch, but the stop switch is used until the internal combustion engine is completely stopped. There was a complaint that it tended to be troublesome to handle because it had to be kept pressed.

Further, when the stop switch is a slide type self-holding type switch, since the ON state is stably held by itself, it is possible to surely stop the internal combustion engine by switching the stop switch to the ON state. Although there is an advantage that it can be done, the internal combustion engine may be started without forgetting to switch the stop switch to the off state, which may make it difficult to restart the internal combustion engine. I was dissatisfied with that.

Therefore, as a conventional technique for eliminating such dissatisfaction, a series circuit including a self-reset type stop switch and a charge / discharge capacitor is connected to both ends of the power generating coil, and an anode and a switching element of the switching element are connected to both ends of the power generating coil. There is a means in which the cathode is connected and the gate of this switching element is connected to the discharge circuit of the charge / discharge capacitor (see, for example, Patent Document 1).

[0006]

[Patent Document 1] Japanese Patent Laid-Open No. 2000-240549

[0007]

However, the technique disclosed in Japanese Patent Application Laid-Open No. 2004-187200 is certainly achieved by a simple pressing operation of a stop switch which is a push button type switch.
You can certainly stop the internal combustion engine,
For the ignition control circuit, which is the main part of the ignition device, troublesome handling such as proper setting of circuit constants such as impedance, rating setting of each component that constitutes the stopping means, and troublesome connection and installation to the ignition control circuit Requires processing,
Therefore, there is a problem that it takes time to handle and implement.

Further, if a failure such as a short circuit or an open occurs in the charge / discharge capacitor or the switching element, the stop function is lost and there is a problem that it is not fail safe.

Further, in order to stop the internal combustion engine, in addition to a stop switch, a charging / discharging capacitor and a switching element are required as dedicated parts, and further, a diode and a resistance element for backflow prevention are required. There are problems that a large number of parts are required to construct the stopping means, which complicates the construction and increases the cost.

Therefore, the present invention was devised to solve the above-mentioned problems in the prior art, and it is a technical problem to make it possible to easily, reliably and safely stop the internal combustion engine. As a result, handling and structure are simple, and high fail-safe can be demonstrated.
Moreover, it aims at enabling it to manufacture and implement at low cost.

[0011]

[Means for Solving the Problems] [Means for Solving the Problems] Of the present invention for solving the above technical problems, the means for carrying out the invention according to claim 1 is driven by an ignition coil having an ignition plug connected to a secondary side and an internal combustion engine. The power generation coil in the high-voltage magnet generator and the charging capacitor that is provided on the primary side of the ignition coil and that is charged by the forward voltage of the output voltage of the power generation coil, conducts when the ignition signal is input, and charges the charging capacitor. And a discharge switching element for discharging the primary coil of the ignition coil, and an ignition circuit for a capacity discharge type internal combustion engine having a voltage value for which a forward voltage can obtain a continuous ignition operation. As, the period detection signal is generated at the ignition timing calculation start time when the preset period detection voltage value is reached,
An ignition device for an internal combustion engine configured to detect the rotation speed of the internal combustion engine based on the time between the adjacent cycle detection signals, and to incorporate an ignition timing control device that outputs an ignition signal to a discharge switching element when necessary. It is a stopping method, and due to a short circuit between the forward direction terminal of the generator coil and ground,
Disabling the generation of the cycle detection signal, the time from the last generated cycle detection signal is shorter than the short circuit time between the forward direction terminal of the generating coil and the ground, and at least one cycle of the internal combustion engine at the time of the short circuit. If the stop time becomes longer than the preset stop time, the ignition signal is continuously output.

According to the invention of claim 1, when the forward direction terminal of the generator coil and the ground are short-circuited during the operation of the internal combustion engine, the forward voltage component of the output voltage is not generated. It becomes impossible to generate it, and the cycle detection signal is no longer output.

The time after the period detection signal is no longer output, that is, the time from the last generated period detection signal is shorter than the short circuit time between the forward direction terminal of the magneto coil and the ground, and the stop is set in advance. When it becomes longer than the time, the ignition signal is continuously output until the ignition signal is not output, that is, until the internal combustion engine is stopped.

When the ignition signal is continuously output, the discharge switching element is maintained in the conductive state, so that the short circuit between the forward direction terminal of the generator coil and the ground is released, and the forward voltage component is induced in the generator coil. Even if the state becomes the state, the induced forward voltage component is not bypassed by the discharging switching element and is not charged in the charging capacitor. Therefore, the ignition operation is not performed until the internal combustion engine is stopped, The internal combustion engine stops completely.

That is, even if the short circuit between the forward direction terminal of the generator coil and the ground is released after the short circuit time has passed, the forward direction terminal of the generator coil remains in the state of being grounded by the discharge switching element. Therefore, the ignition operation cannot be performed.

Even if the ignition control portion fails and the ignition timing control becomes impossible, the ignition operation is stopped by maintaining the short-circuit between the forward terminal of the generator coil and the ground. Since the engine can be stopped surely, high safety is exhibited.

According to a second aspect of the present invention, in the configuration of the first aspect of the invention, the stop time is set to a time slightly longer than three cycles of the internal combustion engine at the time of short-circuiting the forward terminal of the generator coil and the ground. It is the addition of the settings.

According to the second aspect of the invention, in the ignition device for an internal combustion engine, even if a misfire due to a surge which is noise occurs, the misfire due to this surge occurs almost twice in succession. Therefore, even if a surge misfire occurs twice or more in succession, the time of the misfire state due to this surge does not exceed 3 cycles of the internal combustion engine, and therefore the signal accompanying the misfire due to the surge is stopped. It is not mistaken for a signal, which prevents the occurrence of illegal stop due to surge.

The means of the invention according to claim 3 of the present invention includes an ignition coil having an ignition plug connected to a secondary side thereof, a power generation coil in a high pressure magnet generator driven by an internal combustion engine, and an ignition coil. For discharging, which is provided on the primary side of the ignition coil, and which is charged by the forward voltage of the output voltage of the generator coil, conducts when the ignition signal is input, and discharges the charge of the charging capacitor to the primary coil of the ignition coil. A switching element, and the provision of an ignition circuit for a capacity discharge type internal combustion engine having, the rotation speed of the internal combustion engine is calculated in this ignition circuit, and according to an ignition timing signal which is a time signal at this rotation speed or each rotation speed, Composing an ignition timing control device that outputs an ignition signal, which is a trigger signal, to a discharge switching element to form an internal combustion engine ignition device, and ignition timing control The location, the constant voltage power supply unit, and the microcomputer unit, and composed of a periodic signal generating unit, the constant voltage power supply unit,
The reverse voltage of the output voltage of the generator coil is charged, and the output of a constant voltage value is supplied to the microcomputer section and the periodic signal generating section.
The periodic signal generation unit sets the period detection signal at the ignition timing calculation start time when the forward voltage of the output voltage of the generator coil reaches a preset period detection voltage value as a voltage value capable of obtaining a continuous ignition operation. The microcomputer unit calculates the rotation speed from the time from the ignition timing calculation start time, which is the input time of the input cycle detection signal, to the next ignition timing calculation start time, and at the same time the ignition is performed when necessary. A signal is output to the switching element for discharge, a stop switch that is a self-resetting normally open contact is provided between the forward terminal of the generator coil and ground, and a stop switch is provided in the microcomputer section. A count of the stop time preset as a time shorter than the short circuit time and at least longer than one cycle of the internal combustion engine at the time of the short circuit, It was cleared by the period detection signal,
If the count number becomes greater than the stop time, it is necessary to have a stop counter that commands the continuous output of the ignition signal.

According to the third aspect of the invention, since the cycle detection signal is output for each cycle while the internal combustion engine is rotating normally, the stop time is counted by the stop counter. , Will be cleared every cycle and a new count will be started.

Therefore, the stop time counting operation can be accurately and surely performed regardless of the occurrence of a short circuit between the forward direction terminal of the generator coil and the ground.

Since the stop time is set to be longer than at least one cycle of the internal combustion engine which is normally rotating, the count of the stop time does not exceed the preset stop time. Therefore, the ignition signal is output only when necessary, and the normal ignition operation is performed.

Further, since the cycle detection signal obtained by the ignition operation is used as the count clear signal of the stop time,
As long as the ignition device is operating normally, the count of the stop time is surely cleared, and thus the illegal stop of the internal combustion engine is surely prevented.

When the forward direction terminal of the generator coil and the ground are short-circuited by operating the switch of the stop switch to stop the internal combustion engine, the forward voltage component of the output voltage of the generator coil is not generated, so that the cycle detection signal is generated. do not do.

As described above, since the cycle detection signal is not generated, counting the stop time by the stop counter started in accordance with the last cycle detection signal continues without being cleared by the cycle detection signal, and the total count time thereof. If it becomes longer than the stop time, the stop counter outputs a command to continuously output the ignition signal.

Since the instruction to continuously output the ignition signal is issued by counting up the stop time which is shorter than the short circuit time, the discharge switching element has already been discharged when the stop switch self-returns from the on state to the off state. However, since it is maintained in the conductive state by the ignition signal, the forward direction terminal of the power generation coil is in a state of being grounded by the switching element for discharge, and thus the forward voltage component does not rise in the power generation coil, so ignition is impossible, The internal combustion engine stops.

According to a fourth aspect of the invention, the stop time is set to 100 msec in addition to the configuration of the third aspect of the invention.

According to the fourth aspect of the invention, the short-circuit time between the forward direction terminal of the generator coil and the ground by the manually operated stop switch is 250 ms to 5 on average.
Since it is 00 msec, the inconvenience that the short-circuit time becomes shorter than the stop time is eliminated, and the short-circuit time becomes shorter than the stop time, which makes it impossible to stop. Surely prevent.

Further, in the internal combustion engine ignition device, the misfire due to the illegal surge hardly occurs twice in succession, and it is desirable to stop the internal combustion engine except for the emergency. Since it is desirable to perform the coupling in a state where the clutch is disengaged by the clutch, it is almost always performed in the upper half region of the idling range (the rotation speed is approximately 2000 rpm to 4000 rpm) in which the internal combustion engine is stably rotating, The time of one cycle of the internal combustion engine at that time is 30
Since it is msec to 15msec, even if a misfire due to a surge occurs twice in succession, the time is long and about 90msec.
Since it is about m seconds, the signal for misfire due to this surge is not mistaken for a stop signal, and a safe stop operation is performed.

[0030]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a timing chart of ignition of an internal combustion engine in combination with a capacity discharge type ignition circuit in which a push button type stop switch 10 which is a self-resetting type normally open contact of a stop apparatus according to the present invention is assembled. In the block circuit diagram showing the basic circuit configuration of the control device 1, the ignition timing control device 1 is composed of a constant voltage power supply unit 2, a microcomputer unit 3, a periodic signal generation unit 4, and a voltage detection unit 5.

The capacity discharge type ignition circuit in which the ignition timing control device 1 is assembled includes an ignition coil 8 to which an ignition plug 9 is connected on the secondary side, and a power generation which constitutes a high pressure magnet generator driven by an internal combustion engine. A coil 6 and a charging capacitor c6 provided on the primary side of the ignition coil 8 and charged by the forward voltage e1 of the output voltage E of the generator coil 6, and the primary of the ignition coil 8 by conducting the electric charge of the charging capacitor c6. The discharge switching element 7 for discharging the coil is provided, and the stop switch 10 is provided between the forward direction terminal of the magneto coil 6 and the ground.

The forward voltage component e1 of the output voltage E induced in the power generation coil 6 passes through the charging diode d2 and is charged in the charging capacitor c6. The electric charge charged in the charging capacitor c6 is discharged energy regeneration diode d6. Are connected in anti-parallel, and are discharged to the primary coil of the ignition coil 8 by the trigger of the discharge switching element 7 which is a thyristor to which the gate stabilizing resistor r8 is connected, thereby inducing a high voltage in the secondary coil of the ignition coil 8. A spark discharge is generated in the ignition plug 9 to ignite the internal combustion engine.

The constant voltage power supply unit 2 of the ignition timing control device 1 is
Reverse voltage e2 of the output voltage E of the magneto coil 6 (see FIG. 2)
To supply an output of a constant voltage value to the microcomputer unit 3, the periodic signal generation unit 4 and the voltage detection unit 5, which is a reverse voltage component of the output voltage E of the generator coil 6 rectified by the rectifier diode d3. e2 is charged through the current limiting resistor r1 to the power supply capacitor c1 to which the overvoltage preventing Zener diode 23 is connected in parallel, and when this charging voltage reaches a preset constant voltage value, a voltage stabilizing Zener diode is added to the base. The voltage stabilizing transistor 21, which connects 22 and the base resistor r2, becomes conductive and outputs a constant voltage.

The constant voltage value of the constant voltage power supply unit 2 is set to a value close to the upper limit value of the operable voltage of the microcomputer 30 of the microcomputer unit 3, specifically, 5V, whereby the constant voltage output signal Even if surge noise invades, it is not affected by this surge noise.

The microcomputer unit 3 is composed of a microcomputer 30 and a reset IC 32. The reset IC 32 inserted and connected in parallel with the output terminal of the constant voltage power supply unit 2 has an output terminal to which a reset noise removing capacitor c3 is connected. Is connected to the reset port of the microcomputer 30, and when the output voltage value of the constant voltage power supply unit 2 reaches a preset constant value, the microcomputer 30 is started up.

Microcomputer 3 with clock generator 31 assembled
0 receives the constant voltage signal from the constant voltage power supply unit 2 via the power supply noise removing capacitor c2 and outputs the ignition signal s4 via the ignition signal supply resistor r3.

The periodic signal generating section 4 supplies a constant voltage signal from the constant voltage power source section 2 to the signal generating transistor 40 via the waveform shaping resistor r5, and the signal generating transistor 4
If the forward voltage component e1 of the output voltage E of the generator coil 6 exceeds the preset cycle detection voltage value v1 by the series circuit of the detection Zener diode 41 connected to the base of 0 and the voltage detection resistor r4, The signal generation transistor 40 is turned on, and the potential at the connection point between the signal generation transistor 40 and the waveform shaping resistor r5 is output to the microcomputer unit 3 as the cycle detection signal s1.

A series circuit of a noise removing diode d1 and a noise removing capacitor c4 is connected in parallel to the series circuit of the signal generating transistor 40 and the waveform shaping resistor r5.

The voltage detection unit 5 adds the delay side reverse voltage component e2 of the output voltage E of the generator coil 6 to the series circuit of the voltage setting voltage dividing resistors r6 and r7, and adds both voltage setting voltage dividing resistors r6,
The voltage at the voltage dividing point of r7 is output to the microcomputer unit 3 as a voltage signal s6. The voltage dividing resistors r6 and r7 for setting both voltages are
A noise removing capacitor c5 is connected between the voltage dividing point and the ground.

The cycle detection voltage value v1 set by the cycle signal generator 4 is set to, for example, about 40 V according to the value of the forward voltage component e1 obtained in the rotation speed range where the internal combustion engine can be stably started. However, this forward voltage e
Before and after the value of 1 reaches the cycle detection voltage value v1, the constant voltage output signal of the constant voltage power supply unit 2 is output, so that the microcomputer 30 is started up almost simultaneously with the output of the cycle detection signal s1.

When the cycle detection signal s1 is input, the microcomputer 30 sets the input time as the ignition timing calculation start time t1 and measures the time until the next ignition timing calculation start time t1 to calculate the rotation speed, The ignition timing corresponding to the calculated rotation speed is selected from a large number of data stored in advance, and the ignition timing signal s5 of the cycle in which the next ignition timing calculation start time t1 is located is created.

When the voltage signal s6 is input from the voltage detector 5, the microcomputer 30 inputs the voltage signal s6 to the A / D converter, and the voltage value of the delay side reverse voltage e2 reaches the peak voltage value v2. Peak voltage detection signal s2 for detecting that
And a start-up voltage detection signal s3 that detects that the start-up voltage value v3 is located as close as possible to the top dead center of the internal combustion engine and can be detected reliably, for example, the start-up voltage value v3 set to 0.3V.
And create.

Then, in the microcomputer section 30, a stop time preset as an on-time of the stop switch 10, that is, a short circuit time h2 and a time longer than at least one cycle of the internal combustion engine at the time of the short circuit by the stop switch 10 is set. The stop counter of the device of the present invention is provided, which clears the count of h1 by the cycle detection signal s1 and commands the continuous output of the ignition signal s4 when the count number becomes larger than the stop time h1.

Next, the operation of the ignition device will be described in order from the time of starting. When the internal combustion engine is rotated and a constant voltage is output from the constant voltage power supply unit 2, the reset IC 32 detects this and starts up the microcomputer 30 by canceling the reset and starting up. And then go into standby.

From this state (see FIG. 2 below), when the first cycle detection signal s1 is input, the preset start voltage value v3 is detected from the voltage signal s6 input immediately thereafter, and the start is performed. The voltage detection signal s3 is generated, and in accordance with the generation of the starting voltage detection signal s3, the ignition signal s4 is immediately output to the discharge switching element 7 of the ignition circuit to perform the ignition operation, and the internal combustion engine is safely and reliably started. .

Since the ignition operation with the ignition time point as the starting time point t2 is performed safely and surely without causing a ketching, the rotation operation is not always stable. Time or speed Lower limit speed x set (for example, 1500 rp
In the speed range below m), the ignition time is set to the start time t2 and the operation is performed.

In the speed range below the lower limit speed x set in advance after the start mode has elapsed, as shown in FIG. 3, the ignition timing signal s5 obtained by the ignition timing calculation signal of the same cycle is obtained.
Is counted from immediately after the peak detection time t3, and after this counting, the ignition signal s4 is output.

As described above, the calculated ignition timing signal s5 is peak-detected in the speed range where the rotation speed of the internal combustion engine is not always stable and the rotation speed of the internal combustion engine is not more than the lower limit speed x while the flywheel effect is not sufficiently exerted. By setting the ignition time point by counting immediately after the time point t3,
Even if the rotational operation of the internal combustion engine becomes unstable and the cycle period becomes long, the ignition timing does not significantly advance with respect to the top dead center of the internal combustion engine, which ensures the internal combustion engine. The ignition operation will be continued.

The rotational speed of the internal combustion engine rises from a lower limit speed x at which the rotational operation is stable to a standby speed y (for example, 4000 rpm) preset as a speed at which a load may be coupled (idling range). Then, as shown in FIG. 4, the ignition signal s4 is output immediately after the peak detection time point t3 when the peak voltage detection signal s2 detecting the peak voltage value v2 is output.

In the speed range from the lower limit speed x to the standby speed y, as described above, the ignition time point is immediately after the peak detection time point t3. Means "after confirming the peak voltage detection", and this confirmation process is set so that it becomes longer as the rotation speed becomes lower, so that a slight advance of the ignition timing in this speed range is set. I am trying to get it.

The rotational speed of the internal combustion engine is a preset operating speed z, which is approximately the upper limit at which efficient operation of the load can be obtained from the standby speed y that may combine the loads.
In the speed range up to (for example, 8000 rpm), FIG.
As shown in, the rotation speed at this ignition timing calculation start time t1 is calculated from the time from the ignition timing calculation start time t1 which is the input time of the previous cycle detection signal s1 to the current ignition timing calculation start time t1. An ignition timing signal s5 calculated and stored in advance corresponding to the calculated rotation speed.
The ignition timing calculation signal for selecting is calculated, the ignition timing signal s5 obtained by this ignition timing calculation signal is counted from the ignition timing calculation start time t1 of this time, and the ignition signal s4 is output after the elapse of the ignition timing signal s5.

In the speed range from the standby speed y to the operating speed z, the advance angle most suitable for each rotational speed is obtained, so that the output of the internal combustion engine is sufficiently increased and the efficiency of the combined load is improved. You can get good operation.

When the rotational speed of the internal combustion engine rises above the operating speed z, the ignition timing calculation signal becomes longer than the obtained ignition timing signal s5, as shown in FIG. Since the signal s4 cannot be obtained, the ignition timing signal s5 obtained by the ignition timing calculation signal of the previous cycle is used as it is in the next cycle.

In this case, as a matter of course, the efficiency of the internal combustion engine is lowered, so that the speed increase of the internal combustion engine tends to be suppressed.

During rotation of the internal combustion engine, the microcomputer 30
The following two interrupt processes are performed according to the cycle detection signal s1.

One of them is the cycle measuring interrupt process shown in the flowchart of FIG. 7, which starts at step m1, then measures the cycle at step m2 to calculate the rotation speed, and then stops at step m3. The counter is cleared, and then the process returns at step m4 to wait for the interrupt command of the next process.

The other one is a timer interrupt process whose flowchart is shown in FIG.
It is set to generate an interrupt every ms, and after starting at step n1, the count of the stop counter is read at step n2, and the count read at step n3 is the preset stop time h1, for example, 100 m.
Determine if seconds have passed.

If the read count has not passed the stop time h1, step n4 is followed by step n1.
Then, the process waits for an interrupt command for the next process, and conversely, if the read count has passed the stop time h1, a command for turning on the ignition signal s4 is issued in step n5.

FIG. 9 shows the operating states of the output voltage E, the cycle detection signal s1, the ignition signal s4 and the short circuit signal s7 when the internal combustion engine is stopped. The forward voltage component e of the output voltage E is shown.
From the normal ignition operation state in which the cycle detection signal s1 is generated by the rise of 1 and the ignition signal s4 is output after the cycle detection signal s1 is generated, the stop switch 10 is turned on and the short circuit signal s7 shown in FIG. When the
As shown in (a), there is no rise of the forward voltage component e1 in the cycle after the rise of the short circuit signal s7,
Therefore, as shown in FIGS. 9B and 9C, the cycle detection signal s1 and the ignition signal s4 are not generated, which causes the ignition device to misfire, and the stop counter continues counting the stop time h1. To be done.

Due to the inertia of the internal combustion engine in operation, this state continues for several cycles, and when the stop time h1 set to a time shorter than the short circuit time h2 of the stop switch 10 is counted up by the stop counter, ignition is performed. The signal s4 is continuously output, the discharge switching element is maintained in the conductive state, and the forward and reverse terminals of the power generation coil 6 are substantially short-circuited, so that the ignition device cannot perform the ignition operation.

Therefore, even if the stop switch 10 returns to the OFF state after the short circuit time h2 has elapsed, the ignition operation of the ignition device is not restarted, and therefore the internal combustion engine is stopped.

When the internal combustion engine is stopped, the ignition timing control device 1 as a whole returns to the standby state before the internal combustion engine is operating, and naturally, the continuous output of the ignition signal s4 is stopped.

[0063]

Since the present invention has the above-mentioned structure, it has the following effects. According to the invention of claim 1, except for the means for short-circuiting the forward direction terminal of the generator coil and the ground, only the signal processing in the ignition timing control device is required, so that a dedicated stop circuit is provided. As described above, proper setting of circuit constants such as impedance with respect to the main ignition control circuit, rating setting of each component constituting the circuit, and no troublesome handling such as connection and attachment to the ignition control circuit are required. With a simple signal processing setting, a reliable and stable stop operation can be easily obtained.

Since the forward direction terminal of the generator coil and the ground are directly short-circuited to stop the internal combustion engine,
Even if a failure occurs on the ignition timing controller side, the internal combustion engine can be reliably stopped by maintaining the short-circuited state between the forward direction terminal of the generator coil and the ground, which results in a high fail-safe effect. Can be demonstrated reliably.

According to the second aspect of the present invention, even if a misfire due to a surge, which is noise, occurs, the signal accompanying the misfire due to this surge will not be mistaken for a stop signal, and thus the internal combustion engine will be stopped illegally. To operate safely.

According to the third aspect of the present invention, only the stop switch is provided as a dedicated component, and the others only need to set the program in the microcomputer of the ignition timing control device. Therefore, the configuration is extremely simple. At the same time, the cost required for parts and manufacturing can be sufficiently reduced, and the cost can be reduced.

Further, since the cycle detection signal is the clear signal of the stop counter, the stop counter is newly counted in each cycle. Therefore, no matter how long the stop switch is turned on, the stop time counting operation is performed. Can be made accurate, and thus a stable stop operation can be obtained.

According to the fourth aspect of the invention, the inconvenience of being unable to stop due to the short-circuit time being shorter than the stop time is reliably prevented, and a stable and reliable stop operation is performed. Even if a misfire due to a surge that is noise occurs, it can be mistaken for a misfire due to the turning on of the stop switch, so that a safe stop operation that does not stop illegally due to a surge can be obtained. be able to.

[Brief description of drawings]

FIG. 1 is an electric circuit diagram showing an example of a circuit configuration of an ignition device embodying the present invention.

FIG. 2 shows an example of an ignition operation at the time of starting the internal combustion engine,
Operation diagram.

FIG. 3 is an operation diagram showing an example of ignition operation in a speed range of a lower limit speed or less.

FIG. 4 is an operation diagram showing an example of ignition operation in a speed range from a lower limit speed to a standby speed.

FIG. 5 is an operation diagram showing an example of ignition operation in a speed range from a standby speed to an operating speed.

FIG. 6 is an operation diagram showing an example of ignition operation in a speed range equal to or higher than an operating speed.

FIG. 7 is a flowchart showing an example of cycle measurement control according to the present invention.

FIG. 8 is a flowchart showing an example of timer processing according to the present invention.

FIG. 9 is an operation diagram showing an example of a stop operation according to the present invention.

[Explanation of symbols]

1; Ignition timing control device 2; Constant voltage power supply 21; Voltage stabilizing transistor 22; Voltage-stabilized Zener diode 23; Zener diode for overvoltage protection c1; Power supply capacitor r1; current limiting resistor r2: Base resistance 3; Microcomputer section 30; Microcomputer 31; Clock generator 32; Reset IC c2; Power supply noise removal capacitor c3; Reset noise removing capacitor r3; resistance for ignition signal supply 4; Periodic signal generator 40; Signal generating transistor 41; Detection Zener diode r4; Voltage detection resistor r5: Wave shaping resistor d1; Noise removing diode c4: Noise removal capacitor 5; Voltage detector r6; Voltage dividing resistor for voltage setting r7: Voltage dividing resistor for voltage setting c5; Noise removal capacitor 6; Generator coil 7; Discharge switching element 8; Ignition coil 9; Spark plug c6; Charging capacitor d2; Charging diode d3; rectifier diode d4; rectifier diode d5; rectifier diode d6; Discharge energy regeneration diode r8: Gate stabilizing resistor E: Output voltage e1; Forward voltage e2; reverse voltage v1; Period detection voltage value v2; Peak voltage value v3; Starting voltage value s1; Period detection signal s2; Peak voltage detection signal s3; Starting voltage detection signal s4; ignition signal s5; ignition timing signal s6; voltage signal s7; short circuit signal t1; start time of ignition timing calculation t2; at the time of startup t3; Peak detection time x; Lower speed limit y; Standby speed z; operating speed h1; Stop time h2; Short circuit time

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Claims (4)

(57) [Claims] 1. An ignition coil (8) having a spark plug (9) connected to a secondary side thereof, a generator coil (6) in a high-pressure magnet generator driven by an internal combustion engine, and a primary of the ignition coil (8). Is provided on the side of the output voltage (E) of the generator coil (6) for the forward voltage (e
1) charging capacitor (c6), which is charged by the ignition signal (s4), is electrically connected to the charging capacitor (c6) to discharge the charging charge to the primary coil of the ignition coil (8) discharge switching element (7), in the capacity discharge type internal combustion engine ignition circuit having, the forward voltage component (e1), as a voltage value that can obtain a continuous ignition operation, to the preset cycle detection voltage value (v1) The period detection signal (s1) is generated at the reached ignition timing calculation start point (t1), and the adjacent period detection signal (s1) is generated.
While detecting the rotation speed of the internal combustion engine from the time between,
Switching element for discharging the ignition signal (s4) when necessary
In an ignition device for an internal combustion engine having an ignition timing control device (1) that outputs to (7), the generation of the cycle detection signal (s1) due to a short circuit between the forward terminal of the generator coil (6) and ground. Disable, the time from the last generated cycle detection signal (s1) is shorter than the short circuit time (h2) between the forward direction terminal of the generator coil (6) and ground, and at least the internal combustion engine at the time of short circuit The method for stopping the ignition device for an internal combustion engine, wherein the ignition signal (s4) is continuously output if the stop time (h1) is longer than a preset stop time (h1). 2. The internal combustion engine according to claim 1, wherein the stop time (h1) is set to a time slightly longer than 3 cycles of the internal combustion engine when the forward terminal of the magneto coil (6) and the earth are short-circuited. Ignition device stop method. 3. An ignition coil (8) having a spark plug (9) connected to a secondary side thereof, a power generation coil (6) in a high pressure magnet generator driven by an internal combustion engine, and a primary of the ignition coil (8). Is provided on the side of the output voltage (E) of the generator coil (6) for the forward voltage (e
1) charging capacitor (c6), which is charged by the ignition signal (s4), is electrically connected to the charging capacitor (c6) to discharge the charging charge to the primary coil of the ignition coil (8) discharge switching element (7), in the ignition circuit for a capacity discharge type internal combustion engine having, the rotation speed of the internal combustion engine is calculated, and the switching element for discharge according to an ignition timing signal which is the rotation speed or a time signal at each of the rotation speeds.
An ignition timing control device (1) that outputs an ignition signal (s4) that is a trigger signal is attached to (7), and the ignition timing control device (1) is connected to a constant voltage power supply unit (2) and a microcomputer unit (3). ) And the periodic signal generator
(4), and the constant voltage power supply unit (2), the reverse voltage of the output voltage (E) of the generator coil (6) (e2) is charged, the output of a constant voltage value, Microcomputer (3) and periodic signal generator
(4) and the periodic signal generator (4),
Forward voltage amount (e1) of the output voltage (E) of the generator coil (6), as a voltage value that can obtain a continuous ignition operation, ignition timing calculation that reaches a preset cycle detection voltage value (v1) At the start time (t1), the period detection signal (s1) shall be generated,
The microcomputer unit (3) calculates the rotation speed from the time from the ignition timing calculation start time (t1) which is the input time of the input cycle detection signal (s1) to the next ignition timing calculation start time (t1). In addition, in the internal combustion engine ignition device that outputs the ignition signal (s4) to the discharge switching element (7) when necessary, provided between the forward terminal of the generator coil (6) and the ground, A stop switch (10), which is a self-resetting type normally open contact, and a short-circuit time (t2) by the stop switch (10) in the microcomputer section (3), and at least one cycle of the internal combustion engine at the time of short-circuit If the count of the stop time (h1) preset as a longer time is cleared by the cycle detection signal (s1) and the count becomes larger than the stop time (h1), the ignition signal (s4 ) Commanding the continuous output of Data and stop device for an internal combustion engine ignition apparatus consisting of. 4. The stop device for an internal combustion engine ignition device according to claim 1, wherein the stop time (h1) is set to about 100 msec.