JPH01177455A - Ignition device for internal combustion engine - Google Patents

Abstract

PURPOSE:To enable maintenance of ignition energy at a normally specified value even during a fluctuation in a source voltage, by providing an output timing regulating means to regulate the energizing starting timing of an ignition coil according to a detected result. CONSTITUTION:A signal generating means 100 is provided for outputting a timing signal a given time before an optimum ignition timing according to rotation of an internal combustion engine, and based on an output timing signal therefrom, a pulse signal with a given time width is outputted from a pulse signal circuit 200. After an ignition coil 500 is energized for a given time by means of a drive circuit 300 according to a pulse signal therefrom, the energization is disconnected. A voltage detecting means 600 to detect a source voltage is provided, the drive circuit 300 is controlled by an output timing regulating means 780 according to a detected output therefrom to regulate a starting timing of energization to the ignition coil 500. In the ignition coil 500, a power transistor 400 is connected to the primary side thereof and a spark plug 901 is connected to the secondary side thereof through a distributor 900.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an ignition device for an internal combustion engine, and more particularly to a battery type non-contact ignition device.

[Prior Art] In recent internal combustion engines, an on-vehicle battery is used as a power source, and the current in the primary coil of the ignition coil (hereinafter referred to as "secondary current") is interrupted by the switching action of a transistor.
An ignition device is used that induces a high voltage in the secondary coil by the magnetic flux change in the ignition coil when the secondary current is cut off. Conventional breakers use contacts, but since they only use transistors, they are It is also known as a contact ignition system or a full transistor ignition system. The general configuration of this non-contact ignition device is as shown in FIG.
t, and output #J# circuit 902 according to this output signal.
The power transistor 400 is driven by the power transistor 400, and the primary current of the ignition coil 500 is switched on and off. As a result, the high voltage generated in the secondary coil of the ignition coil 500 is supplied to the spark plug 901 provided in each cylinder of the internal combustion engine via the power distribution device 900, generating a spark discharge and discharging the air-fuel mixture in each cylinder. I am planning to ignite it. The electromagnetic signal generator 101- has a detection coil wound around a core to which a permanent magnet is fixed, and a signal rotor having the same number of protrusions as the number of cylinders of the internal combustion engine is rotated in conjunction with the internal combustion engine. This method is known as an electromagnetic power generation method, and outputs an alternating current signal induced by magnetic flux changes occurring in the detection coil.

However, when this electromagnetic signal generator 101 is used,
The energization time of the primary coil of the ignition coil 500 varies depending on the rotation speed of the internal combustion engine, and when the engine rotates at high speed, the energization time becomes shorter, the primary current decreases, and the voltage generated by the secondary coil decreases.

Therefore, in order to prevent this, closing angle control is performed in which the energization time of the primary coil, the so-called closing angle, is controlled in accordance with the rotational speed of the signal rotor, that is, the rotational speed of the internal combustion engine. That is, as shown in FIG.
03 is provided and is described in, for example, Japanese Patent Laid-Open No. 52-70245. This closing angle control circuit 903 allows
The output signal of the electromagnetic signal generator 101 shown in FIG.
For a), the operation level of the output control circuit 90.2 that drives the power transistor 400 is changed according to the rotational speed of the internal combustion engine, such as L at low speed and H at high speed,
This causes the on/off output of the power transistor 400 (
The duty ratio of b) is controlled. Thus, closing angle increase control is performed to increase the current conduction time (closing angle) of the negative current at high speed rotation.

In addition to the above, some models have additional closing angle reduction control in order to save current consumption at low speeds.

[Problems to be Solved by the Invention] However, the closing angle control circuit 903 in the above-mentioned prior art
As is clear from the description in the above-mentioned publication, the circuit configuration is complicated and the cost is high. The basis of the closing angle control is the output signal waveform of the electromagnetic signal generator 101 (Fig. 8(a)
)), and this waveform is determined by the shape of the protrusion of the signal rotor and the magnetic circuit including the detection coil. Therefore, it is difficult to arbitrarily set the closing angle characteristics, and variations in the closing angle characteristics may occur due to manufacturing or assembly errors in the gap between the signal rotor and the detection coil. The problem is that high precision is required and delicate adjustments are required.

Additionally, as sensor technology progresses, instead of the electromagnetic signal generator 101 in the prior art described above, rectangular wave signals such as a magnetic sensitive type, a photoelectric type, etc., which output a rectangular wave pulse signal in accordance with the rotation of the internal combustion engine, are used. A generator is used. There are various methods for this, such as a magnetic sensing method and a photoelectric method, and an example of the former is a signal generator using a Hall element (
For example, as described in JP-A-59-77079). However, when this type of rectangular wave signal generator is used, the closing angle cannot be controlled using the above-mentioned method. In order to make this possible, various circuits are required, for example as described in Japanese Patent Application Laid-Open No. 55-7958, and the circuit configuration is difficult. 3! This becomes complicated and increases the cost.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to ensure constant ignition energy with a simple configuration and even when a square wave signal generator is used as the signal generator, regardless of changes in the rotational speed of the internal combustion engine. do.

[Means for Solving the Problems] In order to solve the above problems and achieve the above objects, the present invention employs the following configuration.

That is, as shown in FIG. 1, the ignition system of the present invention includes a signal generating means 100 that outputs a timing signal a predetermined time before the optimum ignition timing according to the rotation of the internal combustion engine, and an output of the signal generating means 100. a monostable multivibrator circuit 200 that outputs a pulse signal of the predetermined time width based on a timing signal, and this monostable multivibrator circuit 200
a drive circuit 300 that energizes the ignition coil 500 for the predetermined period of time and then shuts off the ignition coil 500 according to the output pulse signal; a voltage detection means 600 that detects the power supply voltage;
The output timing adjusting means 780 controls the drive circuit 300 in accordance with the detected output of 0 and adjusts the timing of starting energization to the ignition coil 500. As before, the power transistor 400 is connected to the negative side of the ignition coil 500, the power distributor 900 is connected to the secondary side, and the spark plug 901 is connected to this.

[Operation] In the ignition device for an internal combustion engine configured as described above, a timing signal is output from the signal generating means ioo in accordance with the rotation of the internal combustion engine. The output timing (output timing) of this timing signal is set a predetermined time before the optimum ignition timing at which the high voltage generated in the ignition coil 500 is supplied to the spark plug 901 via the power distributor 900 and spark discharge occurs. .

The timing signal causes the monostable multivibrator circuit 200 to change from a stable state to a quasi-stable state, and a pulse signal with a predetermined time width is output to the drive circuit 300. During the predetermined time period during which this pulse signal is output, the drive circuit 300 energizes the ignition coil 500 via the power transistor 400 to supply primary current. On the other hand, the power supply voltage is detected by the voltage detection means 600, and the drive circuit 300 is controlled by the output timing adjustment means 780 in accordance with the detected output, and the timing to start energizing the ignition coil SOO is adjusted.

Thus, the drive circuit 300 controls the energization of the ignition coil 500.

As soon as the energization time of the ignition coil 500 ends, the ignition coil 500 is immediately shut off, and a high voltage is output from the secondary coil of the ignition coil 500 and transmitted to each spark plug 901 via the power distributor 900.
Power is distributed to Therefore, regardless of fluctuations in the rotational speed of the internal combustion engine, the energization time to the ignition coil 500 is constant, so a constant ignition energy is always supplied. In addition, the output timing adjusting means 780 adjusts the ignition coil 5 according to fluctuations in the power supply voltage.
Since the start timing of energization to 00 is adjusted, the ignition energy is maintained constant even when the power supply voltage fluctuates.

[Embodiments] Preferred embodiments of the ignition system for an internal combustion engine of the present invention will be described below with reference to the drawings.

First, as the signal generating means 100 shown in FIG. 1, there are various devices including a rectangular wave signal generating device that outputs a rectangular wave pulse signal in response to the rotation of an internal combustion engine (not shown). There are various types of rotation signal detecting means in these devices, and FIG. 2 shows a magnetically sensitive type detecting device as an example. In other words, a magnetized rotor that is cylindrical in shape, has alternately different magnetic poles formed on its periphery, and rotates in synchronization with the rotation of the internal combustion engine! A magnetic detection element 103 is provided opposite to 02,
A magnetic detection element 103 outputs a pulse signal in response to changes in magnetic flux due to rotation of the magnetized rotor 102. This magnetic detection element 103 can be constructed by using a Hall element, a magnetoresistive element, an electromagnetic pickup coil, a Quigant wire, etc., and combining a waveform shaping circuit for shaping the output waveform of these elements as necessary.

In this embodiment, a digital output Hall IC is used as the magnetic detection element 103. Note that it is also possible to perform waveform shaping using an analog output Hall IC. When the magnetized rotor 102 rotates in synchronization with the rotation of the internal combustion engine, the direction of the magnetic force lines supplied to the magnetic detection element 103 of the Hall IC reverses in accordance with the rotation of the magnetized rotor 102. Accordingly, the output level of the magnetic detection element 103 is also reversed.

Hall IC magnetic detection element! 03 and the magnetized rotor 102 are disposed in the power distributor 900 as in the conventional electromagnetic signal generator, and the relative position between the magnetic detection element 103 and the magnetized rotor 102 is controlled by a governor mechanism (not shown) and a vacuum advance. and is configured to be determined by a sensor mechanism (not shown).

That is, the magnetic detection position of the magnetic detection element 103 is configured to move according to the operation of the governor mechanism and the vacuum advancer mechanism.

The timing (output timing) at which the pulse signal of the signal generating means 100 is output as a timing signal is adjusted by the governor mechanism and vacuum advancer mechanism so that it is a predetermined time (T) before the optimum ignition timing. ing.

Hereinafter, regarding the embodiment of the present invention equipped with the signal generating means 100 having the above configuration, first, the output timing adjusting means 7 shown in FIG.
A first embodiment in which 80 is configured with a delay means will be described.

That is, in the first embodiment, as shown in FIG. 3, the monostable multivibrator circuit 200 is
A delay means 700 is disposed between the drive circuit 300 and the drive circuit 300;
A voltage detection means 600 is arranged in this delay means 700. Note that the delay means 700 delays the start time of energization to the ignition coil SOO in accordance with the detection output of the voltage detection means 600.

These monostable multivibrator circuit 200, drive circuit 300, power transistor 400, voltage detection means 60
A concrete electric circuit including the delay means 700 and the delay means 700 will be explained based on FIG.

Monostable multivibrator circuit 200 includes capacitor 20
2. Resistance 203. It includes a trigger circuit consisting of a diode 204. This trigger circuit is of a so-called collector injection type, and a differentiating circuit composed of a capacitor 202 and a resistor 203 is connected to the collector of a transistor 206 via a diode 204. Note that the input terminal 205 is connected to the signal generating means 100.

The collector of the transistor 206 is connected to the power supply +vIl via a resistor 207, and the emitter is connected to the ground GND via a three-stage diode 208. transistor 2
The base of 06 is grounded via a resistor 209 and connected to the collector of a transistor 212 via a parallel circuit of a capacitor 210 and a resistor 211. The collector of the transistor 212 is further connected to the power supply via a resistor 213, the emitter is connected to the anode of a diode 214, and the cathode side of the diode 214 is connected to the ground G.
It has been ND.

The base of the transistor 212 is connected to the capacitor 21.
5 to the collector of the transistor 206, and is also connected to the power supply element v6 via a resistor 216. Thus, the capacitor 215 and the resistor 216 form a time constant circuit that determines the time period during which the monostable multivib break circuit 200 enters a metastable state. and,
This time width is set to be a predetermined time (T) from the output timing of the timing signal of the signal generating means 100 to the optimum ignition timing. Note that a stabilized power source is formed by the Zener diode 218 and the resistor 307.

Next, the drive circuit 30G consists of two stages of phase inversion amplification transistors, a transistor 301 and a transistor 302, and a voltage detection means 600 and a delay means 700 are interposed between them.

The base of the transistor 301 is connected to the cathode of a diode 303 whose anode is connected to the collector of the transistor 212, and is connected to ground G via a resistor 304.
It has been ND. The collector of the transistor 301 is connected to the power supply +V8 via a resistor 305, and the emitter is grounded GND. The collector of the transistor 302 is similarly connected to the power supply +6 via a resistor 306, and the emitter is grounded GND. A delay means 700, which will be described later, is connected between the collector of the transistor 301 and the base of the transistor 302, and a voltage detection means 600 is connected to this delay means 700.

The voltage detection means aOO divides the voltage of the power supply +VB with a resistor 601 and a resistor 602, and is connected to be inputted to an inverting input terminal of an operational amplifier (hereinafter referred to as an operational amplifier) 604 via a resistor 603, and a non-inverting input terminal is connected to a resistor. 605 and a resistor 307 to the power supply +V, and a resistor 606 to ground GND. operational amplifier 60
The output terminal of No. 4 is connected to a non-inverting input terminal via a feedback resistor 607, and is also connected to an inverting input terminal of operational amplifier 01.

Thus, an inverting amplifier circuit is formed, and the operational amplifier 604 inputs the power supply voltage divided by the resistors 601 and 602.
The stabilized in-circuit power supply voltage is connected to resistor 605 and resistor 606.
Invert and amplify the voltage divided by .

The delay means 700 has an operational amplifier 701 and is interposed between the transistors 301 and 302.

That is, a resistor 702 is connected to the collector of the transistor 301 and grounded via a capacitor 703. The connection point between resistor F02 and capacitor 703 is operational amplifier 70.
It is connected to the non-inverting input terminal of No. 1 and to the cathode side of the diode 04 connected in parallel with the resistor 702. The output terminal of the operational buffer 01 is connected to the base of the transistor 302 via a resistor 705.

Note that the resistance value of the resistor 305 is set to a smaller value than that of the resistor 702, so that the time for charging the capacitor 03 via the resistor 305 and the diode 704 is shortened.

Thus, the collector of the transistor 302 of the drive circuit 300 is connected to the base of a power transistor 400 in which two transistors are connected in Darlington, and is also connected to the anode of a Zener diode 401, and the cathode of the Zener diode 401 is connected to the power transistor 400. Connected to the collector of transistor 400.

The collector of the power transistor 400 is the output terminal 404
The emitter is connected to ground GND, and a diode 402 is connected in parallel between the collector and emitter. The output terminal 404 is connected to the ignition coil 5 in FIG.
It is connected to the power supply +v6 via the primary coil 00.

To explain the operation of the circuit configured as above, first, when no timing signal is input to the input terminal 205, the transistor 212 connects to the power supply +v through the resistor 216. The transistor 206 is turned on because the base current is supplied from l, so the transistor 206 is turned off. At this time, the capacitor 215 of the time constant circuit is charged so that the collector side of the transistor 206 becomes positive.

Next, a timing signal is output from the signal generating means 100 to the input terminal 205, and the differentiating circuit and the diode 20
When a negative trigger pulse is applied through 4, the collector potential of the transistor 206 falls in synchronization with this fall, and the voltage of the capacitor 215 is applied to the base of the transistor 212 in the negative direction, so that the transistor 212 is immediately turned off. Since the collector potential of the transistor 212 increases, the transistor 206 is supplied with a base current and turns on, thereby maintaining the off state of the transistor 212. Then, the capacitor 215 is discharged via the resistor 216, and the potential of the capacitor 215 is changed to the transistor 21.
The moment the transistor 2 becomes equal to the sum of the base-emitter voltage VBE of the transistor 2 and the forward voltage V of the diode 214,
06 is turned off, and the transistor 212 returns to the on state.

In this way, the transistor 212 is turned off for a time determined by the time constant of the capacitor 215 and the resistor 216, that is, a predetermined time (T) from the output timing (timing) of the signal generating means JOO to the optimum ignition timing, and the collector potential increases. are doing.

Therefore, the base current is supplied to the transistor 301 through the diode 303 during this predetermined time (T), and the transistor 301 is turned on. As a result, the capacitor 703, which had been charged to near the power supply voltage while the transistor 301 was off, starts discharging via the resistor 702, and the input voltage at the non-inverting input terminal of the operational amplifier 701 gradually decreases. As a result, the discharge of the capacitor 703 progresses, and the voltage on the non-inverting input terminal side of the operational amplifier 701 increases.
01, the output level of the operational amplifier 701 changes from high (H) level to low (L) level.
) level, the transistor 302 turns off,
Power transistor 400 is turned on.

By the way, the inverting input terminal of the operational amplifier 604 is connected to the power supply +
The voltage vB' is divided by a resistor 601 and a resistor 602, inputted, and inverted and amplified. Therefore, when the power supply voltage is high, the output level of the operational amplifier 604 decreases, and when the power supply voltage becomes low, the output level of the operational amplifier 604 increases. That is, the input voltage on the inverting input terminal side of the operational amplifier 701 changes in accordance with fluctuations in the power supply voltage.

Therefore, when the power supply voltage is high, the output level of the operational amplifier 604 decreases, and the inverting input terminal side of the operational amplifier 701 becomes a low level, and the time (1) required for discharging the capacitor 703 until the operational amplifier 701 outputs an output, the power supply voltage is low. sometimes longer than others. Conversely, when the power supply voltage becomes low, the output level of the operational amplifier 604 rises, so the inverting input terminal side of the operational amplifier 701 becomes high level, and the time (1) until the operational amplifier 701 outputs is shortened. Therefore, transistor 212 is turned off, power transistor 400 is turned on, and ignition coil 500 is turned on.
This means that the start time of energization is delayed by the time (1) from the start of the predetermined time (T) at which energization should start until the output level of the operational amplifier 701 changes from a high level to a low level. Furthermore, since this delay time changes to be longer or shorter depending on whether the power supply voltage is high or low, the energization time to the ignition coil 500 is controlled to be short when the power supply voltage is high and long when the power supply voltage is low.

Therefore, a constant amount of energy is stored in the ignition coil 500 regardless of variations in the rotational speed of the internal combustion engine or the power supply voltage, and when the transistor 212 returns to the on state, the transistor 301 turns off and the operational amplifier 701 returns to the high level. Then, transistor 302 is turned on, power transistor 400 is turned off, and power transistor 4
00 collector current falls. That is, the primary current of the ignition coil 500 flowing through the output terminal 404 is abruptly interrupted, and a high voltage is generated in the primary coil, and an even higher pulse voltage is generated in the secondary coil. The spark plug 900 is supplied to the spark plug 901 to cause a spark discharge. Note that when the transistor 301 is turned off, the capacitor 703 is rapidly charged via the resistor 305 and the diode 704, so the time delay of the human input to the non-inverting input terminal of the operational amplifier 701 is so small that it can be ignored.

Thus, the primary coil of the ignition coil 500 is always supplied with appropriate ignition energy regardless of the operating conditions of the internal combustion engine or fluctuations in the power supply voltage. In particular, the monostable multivibrator circuit 2 that is the basis of the energization time of the ignition coil '500
Since the time width of the metastable state of 00 is determined by the capacitance of the capacitor 215 and the resistance value of the resistor 216, it can be easily adjusted by a method such as adjusting the resistance value by trimming.

5 and 6 show a second embodiment of the present invention,
The same devices and parts as in the first embodiment are denoted by the same reference numerals. In the second embodiment, as is clear from FIG. 5, an output inhibiting means 800 is provided as the output timing adjusting means 780 according to the present invention. This output prohibition means 800
is the second time period corresponding to the detection output of the voltage detection means 600.
and the ignition coil 50 by the open drive circuit 300 outputting this second pulse signal.
0 is prohibited from being energized.

FIG. 6 shows a monostable multivibrator circuit 20o1 drive circuit 300, a power transistor 400, and a voltage detection means 6.
00 and an output inhibiting means aOO. This is compared to the electric circuit of the first embodiment shown in FIG. 4, in which an output inhibiting means 800 is inserted in place of the delaying means 700, and a resistor 608 is added accordingly.
The rest of the configuration is the same as that in FIG. 4, so the explanation will be omitted.

The output inhibiting means 800 includes an operational amplifier 801 and is interposed between the transistors 301 and 302. The inverting input terminal of the operational amplifier 801 is the capacitor 80
The connection point between the inverting input terminal and the capacitor 802 is connected to the cathode of a diode 803 whose anode side is connected to the ground GND, and the operational amplifier 6 is connected via a resistor 608 to the collector of the transistor 301.
It is connected to the output terminal of 04. A non-inverting input terminal of the operational amplifier 801 is grounded via a resistor 804. The output terminal of the operational amplifier 801 is connected to the transistor 302 via a resistor 805 and a diode 806, and the cathode of the diode 806 is connected to the transistor 302.
It is connected to the base of 02. This diode 806
A connection point between the cathode of the transistor 302 and the base of the transistor 302 is connected to the collector side of the transistor 301 via a resistor 807.

Further, the output terminal of the operational amplifier 801 is connected to the power supply +v! via the resistor 808 and the resistor 307. 1 and capacitor 8
09 and a diode 810 to ground GND. Note that the anode side of the diode 810 is grounded, and the connection point between the cathode side and the capacitor 809 is connected to the operational amplifier 8.
It is connected to the connection point between the non-inverting input terminal of 01 and the resistor 804.

When the operational amplifier 801 is not operating, the voltage on the inverting input terminal side is higher than the input voltage on the non-inverting input terminal side, so the output is held at a low (L) level.

Regarding the operation of the circuit configured as described above, the operation from the signal generation means 100 to the monostable multivibrator circuit 200 is the same as that of the first embodiment and is as described above. The operation after being supplied will be explained. As mentioned above, the signal generating means 10
The transistor 212 is turned off for a predetermined time (T) for optimal ignition timing from the output timing (output timing) of 0, and the collector potential is rising.

Therefore, during this predetermined time (T), the base current is supplied to the transistor 301 via the diode 303, the transistor 301 is turned on, and the collector potential of the transistor 301 drops to approximately the ground GND level. As a result, a short-time current flows from the output inhibiting means 800 side to the transistor 301 side via the capacitor 802, a negative trigger signal is transmitted to the output inhibiting means 800, and the voltage on the inverting input terminal side of the operational amplifier 801 is becomes lower than the voltage on the non-inverting input terminal side, and the output of the operational amplifier 801 changes to a high level. This high level output is transmitted to the non-inverting input terminal of the operational amplifier 801 via the capacitor 809, and the voltage on the non-inverting input terminal side becomes higher than the voltage on the inverting input terminal side, so the output of the operational amplifier 801 is temporarily stabilized at a high level. state. And capacitor 8
09 progresses, the voltage on the non-inverting input terminal side of the operational amplifier 801 gradually decreases, and when it becomes lower than the voltage on the inverting input terminal side, the output of the operational amplifier 801 is inverted to a low level.

The voltage on the inverting input terminal side of this operational amplifier 801 is determined by the output of the operational amplifier 604.

That is, the inverting input terminal of the operational amplifier 604 is connected to the power supply +V3.
The voltage is divided by a resistor 601 and a resistor 602, inputted, and inverted and amplified. Therefore, when the power supply voltage is high, the output level of the operational amplifier 604 decreases, and conversely, when the power supply voltage decreases, the output level of the operational amplifier 604 increases.

That is, the input voltage on the inverting input terminal side of the operational amplifier 801 changes in accordance with fluctuations in the power supply voltage.

After the output signal of the operational amplifier 801 becomes high level, the capacitor 809 is charged and the voltage on the non-inverting input terminal side becomes higher than the voltage on the inverting input terminal side, which is determined according to the output of the operational amplifier 604, that is, the power supply voltage. Outputs the second pulse signal until it becomes low and becomes a low level output,
This pulse width becomes longer as the voltage on the inverting input terminal side is lower, that is, as the power supply voltage is higher. Therefore, transistor 301
When turned on and the predetermined time (T) begins, the transistor 3
02 to turn on the transistor 302 and keep the power transistor 400 in the off state. After that, when the operational amplifier 801 operates as described above and becomes low level, the base current of the transistor 302 is not supplied because the transistor 301 is in the on state.
Transistor 302 is turned off and power transistor 400 is turned on. Then, the power transistor 400 remains on until the end of the predetermined time (T) during which the transistor 301 is turned off, and the primary coil of the ignition coil 500 is energized and energy is stored.

Thus, constant energy is applied to the ignition coil 500 regardless of variations in the rotational speed of the internal combustion engine or the power supply voltage, and when the transistor 212 returns to the on state, the transistor 301 is turned off, and the resistor 305. Base current is supplied to the transistor 302 via the resistor 807,
Transistor 302 is turned on, power transistor 400 is turned off, and the collector current of power transistor 400 falls. That is, the primary current of the ignition coil 500 flowing through the output terminal 404 is abruptly interrupted, and a high voltage is generated in the primary coil, and an even higher pulse voltage is generated in the secondary coil, which causes the power distribution in FIG. The spark is supplied to the spark plug 901 via the spark plug 900, causing a spark discharge.

As described above, according to both of the above embodiments, when the power supply voltage is low, the energization time to the ignition coil becomes longer and sufficient ignition energy is ensured. Also, when the power supply voltage is high, the timing to start energizing the ignition coil is adjusted to be late.
The energization time to the ignition coil is shortened, unnecessary energy is not supplied, and heat generation of the ignition coil is prevented. That is, the ignition energy is adjusted to maintain a constant ignition energy not only with respect to changes in the rotational speed of the internal combustion engine but also with changes in the power supply voltage.

[Effects of the Invention] As described above, according to the present invention, a constant ignition energy can be always ensured regardless of changes in the rotational speed of the internal combustion engine or the power supply voltage. Moreover,
The circuit configuration is simple, and high precision is not required for processing the signal rotor of the signal generating means, so it can be manufactured at low cost.

Further, even when a rectangular wave signal generating device is used as the signal generating means, control that is not affected by changes in the rotational speed of the internal combustion engine is possible, so various signal generating means can be employed.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of the present invention, FIG. 2 is a plan view showing an embodiment of rotation signal detecting means constituting the signal generating means of the present invention, and FIG. 3 is a first embodiment of the present invention. FIG. 4 is a block diagram showing the same, an electric circuit diagram, FIG. 5 is a block diagram showing the second embodiment of the present invention, FIG. 6 is an electric circuit diagram, FIG. The block diagram shown in FIG. 8 is a waveform diagram for explaining the operation of the conventional ignition device. 100...Signal generation means. 102...Magnetized rotor. 103... Magnetic detection element. 200... Monostable multivibrator circuit. 300...drive circuit. 400...Power transistor. 500...Ignition coil. 600... Voltage detection means. 700...Delay means. 780...Output timing adjustment means. 800...Output prohibition means. 900...Power distributor. 901...Spark plug patent applicant Aisan Kogyo Co., Ltd.

Claims (3)

[Claims] (1) A signal generating means that outputs a timing signal a predetermined time before the optimum ignition timing according to the rotation of the internal combustion engine, and a monostable that outputs a pulse signal of the predetermined time width based on the output timing signal of the signal generating means. a multivibrator circuit, a drive circuit that energizes the ignition coil for the predetermined period of time and then cuts it off in response to an output pulse signal of the monostable multivibrator circuit, a voltage detection means for detecting a power supply voltage, and a detection output of the voltage detection means. An ignition device for an internal combustion engine, comprising: an output timing adjustment means for controlling the drive circuit in accordance with the timing of the ignition coil and adjusting the timing at which energization starts to be applied to the ignition coil. (2) The output timing adjustment means is a delay means for delaying the start time of energization of the ignition coil by the drive circuit in accordance with the detection output of the voltage detection means. The ignition system for the internal combustion engine described in . (3) The output timing adjustment means outputs a second pulse signal having a time width corresponding to the detection output of the voltage detection means, and while the second pulse signal is being output, the The ignition device for an internal combustion engine according to claim 1, characterized in that the ignition device is an output prohibiting means for prohibiting energization to an ignition coil.