JPS61190169A - Ignition device for internal-combustion engine - Google Patents

Abstract

PURPOSE:To reduce a loss by a primary current control switch and prevent rise in temperature when an engine is operated at a low speed by comparing a second integration voltage with a third integration voltage and starting conduction of said primary current control switch when said second integration voltage becomes higher than said third integration voltage. CONSTITUTION:A second integration value which rises from right after each minimum lead angle position to the following minimum lead angle position at a certain gradient, is obtained by a second integration circuit 10, and a third integration value which rises from a position which is delayed by a certain angle from each maximum lead angle position, to a minimum lead angle position or the following maximum lead angle position at a certain gradient, is also obtained by a third integration circuit 11. Both of these integration values are compared by a first comparing circuit 12 and, when the second integration voltage becomes higher than the third integration voltage, conduction of a primary current control switch 3 is started. Thereby, the time when the primary current control switch 3 is conducting can be reduced when operating at a low speed, to reduce a loss, while preventing rise in temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an ignition device for an internal combustion engine that induces a high voltage for ignition by controlling the primary current of an ignition coil using a semiconductor switch.

[Summary of the Invention] The present invention provides a first and second pulse signal that determines a maximum advance position and a minimum advance position of an engine, and an ignition operation permissible interval detection signal generated using both pulse signals. The first to third integral circuits are controlled to generate the first to third integral voltages, and the primary current control switch provided on the primary □ side of the ignition coil is controlled by a comparison circuit that compares these integral voltages. In an ignition device for an internal combustion engine that obtains a high voltage for ignition by controlling the primary current control switch from a conductive state to a cutoff state, it is used to determine when the primary current control switch starts conducting. By changing the rise timing of the integrated voltage in accordance with the engine rotation speed and changing the conduction start timing of the primary current control switch in accordance with the engine rotation speed, the primary current control switch is activated when the engine is running at low speed. This prevents the conduction period of the primary current control switch from becoming too long and reduces loss, and also prevents the conduction period of the primary current control switch from becoming too short when the engine is running at high speed, thereby preventing deterioration of ignition performance. be.

[Prior Art] As this type of ignition device, an electronically controlled ignition device that obtains an advance characteristic using an electronic circuit including an integrating circuit, a comparison circuit, etc. is known. In the conventional ignition system of this type, a signal coil is provided that generates a first signal and a second signal at the minimum advance position of the engine, respectively, and the output of the signal coil triggers a flip-flop circuit. , an ignition operation permissible section detection signal that lasts during the ignition operation permissible section corresponding to the section from the maximum advance angle position to the minimum advance angle position, and an ignition operation permissible section detection signal that lasts for the ignition operation permissible section corresponding to the section from the minimum advance angle position to the next maximum advance angle position. An ignition operation prohibited area detection signal that continues during the operation prohibited area is generated.

By controlling the first and second integration circuits using these section detection signals, a constant initial voltage is maintained during the ignition operation prohibition section from the minimum advance angle position to the maximum advance angle position, and then the maximum advance angle position is reached. The first integral voltage of the waveform increases linearly during the ignition operation permissible interval from A second integrated voltage of a waveform that rises at a constant slope during the operation prohibited section, maintains a constant value during the ignition operation permissible section from the maximum advance angle position to the minimum advance angle position, and returns to zero at the minimum advance angle position. These first and second integrated voltages are compared by a comparator circuit, and when the first integrated voltage exceeds the second integrated voltage in the ignition operation permissible interval, 1 is generated.
The next current control switch is cut off to perform the ignition operation.

[Problems to be solved by the invention] According to the electronically controlled ignition device as described above, the advance angle width,
It is possible to accurately determine the advance angle start rotation speed and the advance angle end rotation speed. However, in this type of ignition device, the primary current control switch is made conductive at the same time as the ignition operation permissible range detection signal rises to prevent the primary current from flowing through the ignition coil. This had the disadvantage that the length of the ignition coil and switch element became too long, increasing losses and causing severe temperature rise in the ignition coil and switch element.

Therefore, the present applicant previously proposed an electronically controlled ignition system for internal combustion engines in which the timing at which the primary current control switch becomes conductive can be arbitrarily set in the application of Japanese Patent Application No. 59-201451. did.

According to the ignition system proposed earlier, by appropriately setting the conduction period of the primary current control switch, it is possible to prevent the conduction period from becoming too long when the engine is running at low speed. This can prevent an increase in the temperature of the ignition coil and the temperature of the ignition coil and elements.

However, in the device proposed earlier, the period (angle) during which the primary current control switch conducts is approximately constant over the entire rotational speed range of the engine, so when the engine is at high speed, the energization time is shortened, and the current cutoff value is It has become clear that there is a problem in that the ignition performance decreases due to a decrease in ignition performance.

An object of the present invention is to provide an electronically controlled ignition device for an internal combustion engine that solves the above problems.

[Means for Solving the Problems] As shown in FIG. 1 showing an embodiment, the present invention includes an ignition coil 1 and a primary current control device provided on the primary side of the ignition coil. a switch 3; and a control circuit that controls the primary current control switch from a conductive state to a cutoff state at the ignition timing of the internal combustion engine, and when the primary current control switch is cut off, the ignition coil is turned off. The target is an ignition system for an internal combustion engine that obtains a high voltage for ignition by suddenly changing the primary current.

In the invention of Box 1, the control circuit (a')
a signal coil 4 that outputs first and second signals Vs1 and VS2 that are equal to or higher than threshold levels at the maximum and minimum advance positions of the ignition timing of the engine in synchronization with the rotation of the internal combustion engine; (b) The first and second signals are shaped into pulses, respectively, and a first pulse signal Vp1 rises at the maximum advance angle position, and a second pulse signal Vp1 rises at the minimum advance angle position.
a waveform shaping circuit that generates the pulse signal V112; (c) a signal storage capacitor 7e; and a charging control transistor switch that becomes conductive when the first pulse signal is generated and instantly charges the signal storage capacitor. and a discharge control transistor switch that becomes conductive when the second pulse signal is generated and instantly discharges the signal storage capacitor, the transistor switch having a discharge control transistor switch that is connected to both ends of the signal storage capacitor from the maximum advance position to the minimum advance position. (d) a first integrating capacitor 8d, which detects an ignition operation permissible range detection signal VQ that continues up to the maximum advance angle position; A first integrating capacitor charging circuit that instantly charges the first integrating capacitor to a constant voltage by the terminal voltage of the signal storage capacitor at the same time as the voltage q rises; (e) a reset circuit 9 that instantly discharges the first integrating capacitor when the second pulse signal Vp2 is generated; (f) A second integrating capacitor 10a, a second integrating capacitor charging circuit that charges the second integrating capacitor 10a with a constant time constant, and a collector-emitter circuit are parallel to the second integrating capacitor. connected to said second
and a second integral capacitor discharging transistor switch which is turned on by a pulse signal of 2, and the integral capacitor of the cylinder 2 is connected at a constant time constant from the position immediately after the minimum advance angle position to the next minimum advance angle position. a second integrating circuit 10 that performs an integral operation of charging and instantaneously discharging the second integrating capacitor at the minimum advance position; (g) a third integrating capacitor 11a; a third integrating capacitor charging circuit that charges with a time constant of and a third integrating capacitor discharging transistor switch connected in parallel to the third integrating capacitor and conducting for a certain period of time triggered by the output of the differentiating circuit, the third integrating capacitor discharging transistor switch is connected in parallel to the third integrating capacitor, and the third integrating capacitor discharging transistor switch is connected in parallel with the third integrating capacitor and is turned on for a certain period of time when triggered by the output of the differentiating circuit, and The integral capacitor of the tube 3 is charged at a constant time constant from the position (this position is delayed as the engine speed increases) to the next maximum advance position, and at the maximum advance position, the third (h) a third integrating circuit 11 that performs an integrating operation to instantaneously discharge an integrating capacitor;
By inputting the second integrated voltage ■C2 obtained across the terminal a and the third integrated voltage Vc3 obtained across the third integrating capacitor 11a, the second integrated voltage becomes equal to or lower than the third integrated voltage. a first current control switch that prevents conduction of the primary current control switch when the second integrated voltage exceeds the third integrated voltage; a comparator circuit 12; (i) a first integral voltage Vcl whose output terminal is coupled to the control signal input terminal of the primary current control switch and which is obtained across the first integrating capacitor 8d and the second integral voltage; The second integrated voltage Vc obtained across the capacitor 10a
2 and the first comparator circuit allows the primary current control switch to conduct, and while the first integrated voltage is equal to or lower than the second integrated voltage, the primary current The control switch is made conductive so that the first integrated voltage changes to the second integrated voltage.
and a second comparison circuit 13 that shuts off the primary current control switch when the integrated voltage exceeds the integrated voltage.

Further, the invention of the cylinder 2 of the present application provides a third integration circuit 11 of the third integration circuit 11.
This invention is different from the first invention in that the integrating capacitor 11'a is charged by the voltage q across the signal storage capacitor of the ignition operation permissible interval detection signal generating circuit. This second
In the invention, the third integral circuit charges the third integrating capacitor 11a with a constant time constant from a position delayed by a predetermined angle from each maximum advance angle position to the minimum advance angle position, and The terminal voltage of the third integral capacitor is held until the next maximum advance position, and an integral operation is performed to instantly discharge the third integral capacitor at the maximum advance position.

The ignition device previously proposed in the present invention (Japanese Patent Application No. 59-2
01451) is different from the first pulse signal Vp.
1 or the rise of the ignition operation permissible interval detection signal is provided, and the third integrating capacitor discharging switch is triggered by the output of the differentiating circuit.

[Operation of the Invention] In the above configuration, the ignition operation is performed when the first integrated voltage exceeds the second integrated voltage, which is similar to the conventional ignition device of this type. Since the position where the first integrated voltage exceeds the second integrated voltage advances as the engine speed increases, the ignition timing of the engine advances as the engine speed increases.

In the present invention, the second integrated voltage increases at a constant gradient from the position immediately after each minimum advance position to the next minimum advance position, and the second integral voltage increases from a position delayed by a predetermined angle from each maximum advance position. The primary current control switch is activated when the second integrated voltage exceeds the third integrated voltage by comparing it with the third integrated voltage that increases at a constant gradient up to the angular position or the next maximum advance position. Starts conduction. In this way, when the third integrated voltage and the second integrated voltage are compared and the second integrated voltage exceeds the third integrated voltage, the primary current control switch starts conducting. It is possible to prevent the period during which the primary current control switch is conductive when the engine is running at low speed from becoming longer than necessary, resulting in an increase in loss and a significant rise in temperature of the switch element.

Also, since the time width of the output pulse of the differentiator circuit is constant,
The charging start position (angle) of the 36th integral capacitor is delayed as the engine speed increases. Therefore, as the engine speed increases, the charging time of the third integral converter 4 becomes shorter, and the magnitude of the third integral voltage decreases as the engine speed increases. Therefore, the second
The position where the integrated voltage of (The conduction angle of the primary current becomes longer). Therefore, it is possible to prevent the current cut-off value from becoming low when the engine rotates at high speed, and it is possible to prevent the ignition performance from decreasing at high speed.

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

(a) Structure of the first embodiment of the invention FIG. 1 shows an embodiment of the present invention.
An ignition coil 2 having a secondary coil 1b is a spark plug attached to a cylinder of an engine (not shown) and connected to a non-ground terminal of a secondary coil of the ignition coil via a high voltage cord. One end of the primary coil and the secondary coil of the ignition coil 1 are connected to the collector of the transistor 3 whose emitter is grounded, and the other end 1a1 of the primary coil is connected to the positive terminal of a battery (not shown) whose negative terminal is grounded. ing. Note that a Darlington-connected composite transistor is used as the 1-transistor 3 in this example.

The transistor 3 constitutes a primary current control switch, and is controlled by a control circuit to be described later so that it is turned on when the phase advances in accordance with the ignition timing of the engine, and is turned off at the ignition timing. .

When the transistor 3 is cut off, the primary current that had been flowing between the primary coil 1a of the ignition coil and the collector-emitter of the transistor 3 is cut off, so the primary current is not allowed to flow through the primary coil. A high voltage in the direction of continuation is induced.

At this point, a large magnetic flux change occurs in the iron core of the ignition coil, and this magnetic flux change induces a high voltage in the secondary coil. Since this high voltage is applied to the spark plug 2, a spark discharge occurs in the spark plug, and the engine is ignited.

The control circuit that controls the transistor (primary current control switch) 3 includes a signal coil 4, a waveform shaping circuit including first and second pulse shaping circuits 5 and 6, and an ignition operation permissible interval detection signal generation circuit. 7, a first integrating circuit 8,
It consists of a reset circuit 9, a second integration circuit 1.0, a third integration circuit 11, and first and second comparison circuits 12 and 13.

The signal coil 4 is disposed in a signal generator that rotates in synchronization with the rotation of the engine, and reaches a threshold level Vt at maximum advance angle positions θ1 and θ2 of the engine, respectively, as shown in FIG.
A first signal VS1 and a second signal Vs2 exceeding . One end of this signal coil 4 is grounded.

The first pulse shaping circuit 5 includes a diode 5a whose anode is connected to the non-ground terminal of the signal coil 4, a capacitor 5b and a resistor 5C whose one end is connected to the cathode of the diode 5a and whose other ends are commonly connected. , a capacitor 5b and a resistor 5d connected between the common connection point of the other end of the resistor 5c and ground.

The second pulse shaping circuit 6 includes a diode 6a whose cathode is connected to the non-ground terminal of the signal line 4, a capacitor 6b and a resistor 6C, one end of which is connected to the anode of the diode 6a, and the other end of which is commonly connected. and a waveform shaping transistor (NPNt-
A diode 6e whose anode is connected between the base of the transistor 6d and the ground side with an opposite number to the ground side, and resistors 6f and 69 whose one end is connected to the base and collector of the transistor d, respectively. ing.

The ignition operation permissible zone detection signal generation circuit 7 has a base that is connected to the first
an NPN transistor 7a whose emitter is connected to the non-grounded terminal of the resistor 5d of the pulse shaping circuit 5; a PNP transistor 7C whose base is connected to the collector of the transistor 7a via a resistor 7b;
A resistor 7d is connected between the emitter and base of the transistor 7C, a signal storage capacitor 7e is connected between the collector of the transistor 7C and the ground, the collector is connected to the non-ground terminal of the capacitor 7e, and the emitter is grounded. It consists of an NPN transistor 7f and a resistor 7Q, one end of which is connected to the base of the transistor 7f.
A terminal 7c1 connected to the emitter of is connected to an output terminal of a constant voltage circuit (not shown) powered by a battery.

In this embodiment, transistors 7a, 7c and resistor 7b,
7d constitutes an I-transistor switch for charge control, and transistor 7f and resistor 7Q constitute a transistor switch for discharge control.

As described above, in the present invention, since the ignition operation permissible interval detection signal generation circuit 7 is configured by the signal storage capacitor and the transistor switch that controls charging and discharging of the capacitor, the flip-flop circuit using many logic elements can be used. The configuration can be simplified compared to using
Moreover, malfunctions due to noise can be prevented by appropriately setting the trigger level of the transistor switch that controls charging and discharging of the capacitor 7e.

Next, the first integrating circuit 8 includes a resistive voltage dividing circuit consisting of a series circuit of resistors 8a and 8b connected in parallel to both ends of the signal storage capacitor 7e, and a base connected to the voltage dividing point of the resistive voltage dividing circuit. A first integrating circuit transistor (N
PN transistor) 8c, a first integrating capacitor 8d connected between the emitter of transistor 8c and ground, a speed-up capacitor 8e connected between the base emitter of transistor 8C, and a collector-emitter of transistor 8C. It consists of a resistor of 8f.

The reset circuit 9 includes a reset transistor (NPN transistor) 9a whose emitter is grounded and whose collector is connected to the non-grounded terminal of the first integrating capacitor 8d, and one end connected to the base of the transistor 9a. A resistor 9b whose other end is connected to the collector/lid of the waveform shaping transistor 6d, one end connected to the non-ground terminal of the first integrating capacitor 8d, and the other end connected to the collector of the transistor 6d for malfunction prevention. It consists of a capacitor 9C.

The second integrating circuit 10 includes a second integrating capacitor 10a whose one end is grounded, a discharge transistor (NPNt-transistor) 10b whose collector is connected to the non-grounded terminal of the capacitor 10a and whose emitter is grounded, and a transistor A resistor 10c connected between the base of the transistor 10b and the collector of the waveform shaping transistor 6d, and the transistor 1
The resistor 10d has one end connected to the corctor 0b, and the other end 10d1 of the resistor 10d is connected to an output terminal of a constant voltage circuit (not shown).

The third integrating circuit 11 includes a third integrating capacitor 11a whose one end is grounded, a discharge transistor (NPN transistor) 11b whose collector is connected to the non-grounded terminal of the capacitor 11a and whose emitter is grounded, and a transistor 11b. a resistor 11c whose one end is connected to the base of the transistor 11b, and a resistor 1 connected between the base and emitter of the transistor 11b.
1d, a capacitor 11e connected between the other end of the resistor 11c and the non-ground terminal of the signal storage capacitor 7e of the ignition operation permissible interval detection signal generation circuit 7, and one end connected to the collector of the transistor 11b. The other end 11f1 of the resistor 11f is connected to an output terminal of a constant voltage circuit (not shown). In this embodiment, the differential circuit 1 is constructed by resistors 11C, 11d and capacitor 11e.
10 are configured. This differentiating circuit 11o generates a pulse by differentiating the rising edge of the ignition operation permissible interval detection signal Vq obtained at both ends of the signal storage capacitor 7e, and while the pulse is generated, the transistor 11b is made conductive to close the capacitor 11a. Let it discharge.

The first comparison circuit 12 is a voltage comparator 12a composed of an IC.
and an external resistor 12b connected between the output terminal of the comparator 12a and the power supply terminal, and the output terminal of the comparator 12a is connected to the base (control signal input terminal) of the transistor 3. . The third integral voltage Vc3 obtained across the third integrating capacitor 11a is input to the negative phase input terminal of the comparator 12a, and the voltage across the second integrating capacitor 10a is input to the positive phase hook terminal of the comparator 12a. The second integrated voltage Vc2 obtained in the second integrated voltage Vc2 is inputted.

The second comparison circuit 13 includes a voltage comparator 13a made of an IC.
and an external resistor 13b connected between the output terminal of the comparator 13a and the power supply terminal, and the output terminal of the comparator 13a is connected to the base of the transistor 3. The first integral voltage MCI obtained across the first integrating capacitor 8d is input to the negative phase input terminal of the comparator 13a, and the second integral voltage MCI obtained at both ends of the first integrating capacitor 8d is input to the positive phase input terminal of the comparator 13a.
A second integrated voltage Vc2 obtained at both ends of a is input.

(b) Operation of the first embodiment of the invention Next, the operation of the above embodiment will be explained with reference to FIG. FIG. 2A shows the first and second signals V obtained at the signal coil 4.
Figure 2B shows the waveforms of SI and Vs2.
The waveforms of the pulse signals V111 and Vp2 are shown.

In addition, the integrated voltages Vc1 and Vc2 shown in FIG.
, the voltage at the output terminal of the second comparison circuit 13 when the output terminals of the first and second comparison circuits are not connected in common, Vb1, the output voltage of the differentiating circuit 11Q, Vf1, the integrated voltages Vc2, Vc3, the first and the voltage Vd of the output terminal of the first comparison circuit 12 in the case where the output terminals of the second comparison circuit are not commonly connected, the base-emitter voltage Vbe of the transistor 3, and the primary current of the ignition coil. 11
, and the waveforms of the secondary current I2 of the ignition coil, and the second figures to P are the integrated voltages Vcl when there is the malfunction prevention capacitor 9C, respectively.

Vc2, the voltage at the output terminal of the second comparison circuit 13 vb1
Pace emitter voltage V be of the Tokunjister 3, primary current I1 of the ignition coil, and secondary current I2 of the ignition coil
The waveform is shown. The horizontal axis in FIG. 2 shows the rotation angle θ of the engine, and each angle is measured from the top dead center TDC of the engine.

As shown in FIG. 2A, the signal coil 4 generates a first signal S1 that exceeds the threshold level Vt at the maximum advance position θ1, and reaches the threshold level Vt at the minimum advance position θ2. A second signal VS2 that is equal to or higher than Vt is generated. The first pulse shaping circuit 5 differentiates the first signal Vsl and generates a first pulse signal p1 at the maximum advance angle position θ1 as shown in FIG. 2B.

In the second waveform shaping circuit 6, a base current flows from a power supply (not shown) to the transistor 6d through the resistor 6f, and the transistor 6d becomes conductive.

When the second signal Vs2 is generated, a current flows through the diode 6e, the resistor 6C, the capacitor 6b1, and the diode 6a of the second pulse shaping circuit 6, and when the voltage across the diode 6e reaches a predetermined value at the minimum advance position θ2. (Second
When the signal VS2 becomes equal to or higher than the threshold voltage level Vt), the space emitter of the transistor 6d is reverse biased, and the transistor 6d is turned off. When the second signal VS2 falls below the threshold level, the transistor 6d becomes conductive again. Therefore transistor 6d
A second pulse signal Vp2 having a pulse width corresponding to 111 times when the second signal VS2 is above the threshold level is obtained between the collector and emitter.

When the first pulse signal Vpl is generated at the maximum advance angle position θ1, the transistor 7a becomes conductive and the transistor 7C becomes conductive. As a result, the signal storage capacitor 7e is instantly charged to a constant voltage Vqm as shown in FIG. 2C. Then, at the minimum advance angle position θ2, the second pulse signal Vp2
occurs (transistor 6 (jlfi is cut off)), a base current flows to transistor 7f through resistor 6q, transistor 7f becomes conductive, and signal storage capacitor 7e is instantly discharged. An ignition operation permissible section detection signal Vq (FIG. 2C) that lasts from the maximum advance angle position θ1 to the minimum advance angle position θ2 is obtained at both ends of the signal storage capacitor 7e.

When the above-mentioned ignition operation permissible section detection signal vq is generated, the first
The integrating circuit transistor 8c becomes conductive, and the first integrating capacitor 8d of the first integrating circuit 8 instantaneously reaches an initial voltage VO equal to the output voltage of the resistive voltage divider circuit minus the emitter voltage of the transistor 8c. is charged to. When the signal storage capacitor 8d is charged to the initial voltage VO, the first integrating circuit transistor 8c is cut off (base current no longer flows to the transistor 8C), so the signal storage capacitor 8d is charged to the first integrating circuit transistor 8c. The battery is additionally charged at a constant time constant through a charging resistor 8f connected between the collector and emitter of the circuit transistor 8C. Therefore, the waveform of the first integrated voltage Vc1 obtained across the first integrating capacitor 8d instantaneously rises to the initial voltage ■0 at the maximum advance angle position θ1, and then further rises as shown in the second diagram. The waveform will be as follows.

In the second integrating circuit 10, a second integrating capacitor 10a
is charged at a constant time constant from immediately after the minimum advance angle position θ2 to the next minimum advance angle position θ2, and when the second pulse signal is generated at the minimum advance angle position, the transistor 1ob becomes conductive and the capacitor 10a is discharged. . Therefore, a second integral voltage Vc2 as shown in the second diagram F and K is obtained across the second integral capacitor 10a.

In the third integration circuit 11, the ignition operation permissible section detection signal V
The output voltage Vf of the differentiating circuit 11o that differentiates the rising edge of Q disappears, and the 1-transistor 11b is charged at a constant time constant from the position where it is cut off to the next maximum advance position θ1, and the maximum advance angle A device performs ignition operation. When the allowable interval detection signal Vq rises and the differentiating circuit 11q outputs the pulse Vf, the transistor 1
1b becomes conductive and discharges the capacitor 11a. Therefore, as shown in FIG. 2F, both ends of the third integral capacitor 11a have a capacitor that rises at a constant gradient from a position θ3 delayed by an angle α from each maximum advance angle position θ1 to the next maximum advance angle position θ1. 3 integral voltage Vc3 is obtained.

The second integrated voltage Vc2 and the third integrated voltage Vc3 are input to the first comparison circuit 12. First comparison circuit 12
In this case, when the second integrated voltage Vc2 is lower than the third integrated voltage Vc3, the output stage of the comparator 12a becomes disconnected, and the ground voltage Vd at its output terminal becomes high level. Further, when the second integrated voltage Vc2 is lower than the third integrated voltage Vc3, the output stage of the comparator 13a is in a conductive state, and the potential of the output terminal of the comparator circuit 13 is approximately at the ground level (zero). It has become.

Therefore, the waveform of the voltage Vd at the output terminal of the first comparator circuit 12 becomes as shown in FIG. conduction of the transistor 3 is prohibited, and conduction of the transistor 3 is allowed only during the period when the voltage Vd is at a high level.

The first integrated voltage Vc1 and the second integrated voltage C2 are input to the second comparison circuit 13. In the second comparison circuit, when the first integrated voltage Vcl is less than or equal to the second integrated voltage Vc2, the output stage of the comparator 13a is in a cutoff state,
When the first integrated voltage Vcl exceeds the second integrated voltage Vc2, the output stage of the comparator 13a is cut off. Therefore, the second
As shown in FIG. E or M, when the first integrated voltage Vc1 is less than the second integrated voltage Vc2, the second comparator
While the mine-to-mine voltage vb at the output terminal of No. 3 becomes high level and the first integrated voltage Vc1 exceeds the second integrated voltage Vc2, the ground-to-ground voltage at the output terminal of the second comparator circuit 13 becomes zero. . Therefore, the second integrated voltage Vc2 becomes the third integrated voltage Vc
3 (allowing conduction of the transistor 3), and the first integrated voltage C1 is equal to the second integrated voltage Vc2.
In the following cases, the second comparator circuit 13 allows the base current to flow through the transistor 3 as a primary current control switch to turn the transistor 3 into a conductive state, as shown in FIG.
Or, as shown in O, the primary current 11 is caused to flow through the ignition coil. The second comparison circuit 13 also sets the base potential of the transistor 3 to approximately the ground potential to turn off the transistor 3 when the first integrated voltage Vc1 exceeds the second integrated voltage Vc2. Since the transistor 3 suddenly changes from the conductive state, a large magnetic flux change occurs in the iron core of the ignition coil,
A high voltage is induced in the secondary coil 1b of the ignition coil. This causes a spark discharge to occur in the spark plug 2 attached to the cylinder of the engine, and the engine is ignited.

Since the phase in which the first integrated voltage Vcl exceeds the second integrated voltage Vc2 advances as the engine speed increases, the ignition timing of the engine advances as the engine speed increases.

As described above, in the present invention, the second integrated voltage Vc
2 exceeds the third integrated voltage Vc3, the transistor 3 (primary current control switch) becomes conductive.

11 (the time constant determined by j and the capacitor 11e) and the integration constant of the third integrating circuit 11 (the time constant determined by the capacitor 11a and the resistor 11d), the primary current control switch becomes conductive. The time to start can be set arbitrarily. Therefore, when the engine is running at low speed, the period during which the primary current of the ignition coil is energized is the minimum necessary. By setting the integration constant of the third integration circuit, losses can be minimized, and It is possible to suppress a rise in temperature of the switch element constituting the next current control switch. Furthermore, the position θ3 at which charging of the third integral capacitor starts is delayed as the engine speed increases, and the position where the second integral voltage exceeds the third integral voltage is the position where the engine speed increases. Since it progresses as the engine speed increases, the primary current energization time becomes longer as the engine speed increases. Therefore, it is possible to prevent the cut-off current value from becoming low when the engine is running at high speed, and it is possible to prevent the ignition performance from decreasing when the engine is running at high speed.

In the above embodiment, the malfunction prevention conan 4 no 90
Even if there is no such setting, if there is no noise induced in the signal coil 4 that would cut off the waveform shaping transistor when a spark discharge occurs in the ignition plug 2, then the The 1 integrated voltage Vcl continues to rise at a constant rate even after exceeding the second integrated voltage Vc2, and returns to zero when the reset 1-transistor 9a becomes conductive at the minimum advance position θ2. In this case, the duration of spark discharge at the spark plug becomes sufficiently long, and a predetermined ignition performance can be obtained.

On the other hand, if there is no malfunction prevention capacitor 9C and noise is induced in the signal coil 4 when spark discharge occurs in the spark plug 2, and this noise shuts off the waveform shaping transistor 6d, then the transistor 9a becomes conductive and discharges the capacitor 8d. Therefore, as shown by the broken line in the second diagram, the first integrated voltage Vc1 becomes less than the second integrated voltage Vc2 almost at the same time as the ignition spark occurs, causing the transistor 3 to become conductive again and discharging at the spark plug. Disappear. At this point, the waveform of the secondary current I2 of the ignition coil 1 is
As shown by the broken line at K in the figure, the duration of the ignition spark is significantly shortened. As described above, without the malfunction prevention capacitor 9C, when the waveform shaping l to Planstaro d conducts due to noise generated by the ignition spark, the ignition spark disappears in a short period of time, and the ignition performance deteriorates.

Therefore, by providing the malfunction prevention capacitor 9C, the ignition operation permissible section detection signal is generated during the period when the waveform shaping transistor 6d is conductive (the period when the second signal S2 above the threshold level is not generated). The electric charge of the signal storage capacitor 7e of the circuit 7 charges the malfunction prevention capacitor 9C. When the first integrated voltage Vc1 exceeds the second integrated voltage ■C2 and spark discharge occurs in the spark plug 2, and noise generated by the spark discharge is induced in the signal coil 4, the waveform shaping transistor is cut off by the noise. do. At the same time as this waveform shaping transistor is cut off, the voltage of the malfunction prevention capacitor 9C is applied to the first integrating capacitor 8f, and the terminal voltage of the first integrating capacitor is raised by the terminal voltage of the malfunction prevention capacitor. Therefore, as shown in the second diagram, the first
The terminal voltage Vc1 of the integrating capacitor increases. Therefore, the first integrating capacitor will not be discharged below the terminal voltage of the second integrating capacitor due to short conduction of the reset transistor T6 due to noise, and the first integrating capacitor will not be reset by the noise generated by the ignition spark.
- The reset circuit will no longer malfunction. At this point, the waveform of the primary current 11 and the waveform of the secondary current I2 of the ignition coil become as shown in O and P of FIG. 2, respectively, and the spark duration becomes sufficiently long to obtain the desired ignition performance. .

Therefore, when putting the ignition device of the present invention into practical use, it is preferable to provide a malfunction prevention capacitor 9c.

Furthermore, in the above embodiment, if there is no speed-up capacitor 8e between the collector and base of the transistor 8C of the first integrating circuit 8, hFE of the transistor 8C
The initial charging voltage of the first integrating capacitor varies depending on the temperature characteristics of the first integrating capacitor. In other words, when the ambient temperature is low,
Since hFF of the transistor 8C is small, the collector current of the transistor 8c is a small value determined by the product of the base current Tb determined by the resistance value of the resistor 8a and [IbxhF, as shown by the broken line in FIG. 3C. The initial charging voltage VO- of the capacitor 8d is suppressed low and its rise is delayed. Also, if the ambient humidity is high,
Since h'[ becomes larger, the collector current of the transistor 8C becomes larger, and the initial charged N voltage 0' of the capacitor 8d becomes higher as shown by the solid line in FIG. 3C. As described above, if the capacitor 8e were not provided, the first integrated voltage Vc1 would vary depending on the ambient temperature, and the ignition timing of the engine would vary depending on the ambient temperature, which would adversely affect the performance of the engine.

On the other hand, if the speed-up capacitor 8e is provided as in the present invention, charging current flows into the capacitor 8e at the same time as the ignition operation permissible interval detection signal Vq rises, supplying a large base current to the transistor 8C. The capacitor 8e speeds up the rise of the collector current of the transistor 8C and overdrives the transistor 8G, thereby increasing the initial value of the charging voltage of the capacitor 8f and speeding up its rise. Therefore, if the capacitor e is provided, the first integrated voltage Vc1
is almost unaffected by the ambient temperature, and the first integrated voltage V
c1 has the waveform shown in the third diagram regardless of the ambient humidity. Therefore, if large fluctuations in ambient temperature are expected, it is preferable to provide the capacitor 8e.

(c) Modified example of the ignition circuit In the above embodiment, the transistor 3 as the primary current control switch is connected in series with the primary coil 1a of the ignition coil. The present invention can also be applied to a current interrupt type ignition device that is provided in parallel to the primary coil of the ignition coil. For example, as shown in FIG. 4, the collector-emitter circuit of the transistor 3 is connected in parallel to the primary coil 1a of the ignition coil 1, and the exciter coil is connected in parallel to the collector-emitter circuit of the transistor 3. The present invention can be similarly applied to the ignition device to which 20 is connected. In this ignition system, (1) the exciter coil 20 is provided in a magnet generator driven by the engine, and induces an alternating current voltage in synchronization with the rotation of the engine; The output terminal of the second comparison circuit 13 is connected to the base of the transistor 30, and the resistor 21 is connected between the base and collector of the transistor 3. The first integrated voltage Vc1 and the second integrated voltage Vc2 are input to the negative phase input terminal and the positive phase input terminal of the second comparison circuit 13, respectively, and the first integrated voltage Vcl is lower than or equal to the second integrated voltage Vc2. In this case, the potential of the output terminal of the second comparison circuit 13 is at a high level, allowing the transistor 3 to conduct. When a voltage in the direction of the arrow shown in the figure is induced in the exciter coil 20 while the potential of the output terminal of the second comparison circuit 13 is at a high level, a base current flows through the transistor 3, and the transistor 3 becomes conductive. As a result, a short circuit current flows from the exciter coil 20 through the collector-emitter of the transistor 3. When the first integrated voltage Vc1 exceeds the second integrated voltage Vc2 and the potential of the output terminal of the second comparison circuit 13 becomes the ground potential, the transistor 3 is cut off, so a high voltage is induced in the exciter coil 20. Then, this voltage is applied to the primary coil of the ignition coil 1. Therefore, a large magnetic flux change occurs in the iron core of the ignition coil, and a high voltage for eight ignitions is induced in the secondary coil 1b.

(d) Embodiment of the second invention In the above embodiment, the third integrating capacitor 11a was charged by a constant voltage power supply circuit (not shown), but in the second invention of the present application, the third integrating capacitor 11a is It is charged with the voltage across the signal storage capacitor 7e. FIG. 5 shows an embodiment of the second invention. In this embodiment, one end of a resistor 11h is connected to the non-grounded terminal of the third integrating capacitor 11a, and the (I! The cathode of the diode 11i is connected to the ! end.The anode of the diode 11i is for signal accumulation] nden (J-7
The resistor 11h and the diode 111 constitute a third integrating capacitor charging circuit that charges the third integrating capacitor 11a with the terminal voltage of the signal storage capacitor 7e at a constant time constant. There is. The rest of the structure is the same as the embodiment shown in FIG.

In the embodiment of FIG. 5, the third integral]
a is charged by the terminal voltage of the signal storage capacitor 7e, the waveform of the third integrated voltage Vc3 obtained across the third integrating capacitor 11a has a maximum advance as shown in FIG. 6G. The waveform rises at a constant slope from a position delayed by a predetermined angle α from the angular position θ1 to the minimum advance angle position θ2, and returns to zero at the next maximum advance angle position 01. This't? tS
In the example as well, the second integral voltage Vc2 is the third integral voltage Vc2? G
When the voltage Vc exceeds 3, the transistor 3 becomes conductive and ignites] The primary current flows through the coil 1, and when the first integrated voltage Vcl exceeds the second integrated voltage Vc2, the transistor 3 shuts off. An ignition operation is performed.

(e) Other Modifications In the above embodiment, a pulse V of a constant time width is obtained by differentiating the rising edge of the ignition operation permissible interval detection signal VQ in the differentiating circuit 110 of the third integrating circuit. However, if a waveform with a sufficiently fast rise can be obtained as the first pulse Vp1, the rise of the first pulse signal Vp1 is differentiated by the differentiating circuit 11o to obtain a pulse Vf of a constant time width. You can also.

[Effects of the Invention] As described above, according to the present invention, the second integrated voltage increases at a constant gradient from the position immediately after each minimum advance position to the next minimum advance position, and the second integral voltage increases at each maximum advance angle. The second integrated voltage is compared with a third integrated voltage that increases at a constant gradient from a position delayed by a predetermined angle from the position to the minimum advance position or the next maximum advance position.
Since the primary current control switch starts to conduct when the integrated voltage of It is possible to prevent the temperature of the switching element from increasing or the temperature of the switching element from increasing significantly. Further, the position where the second integrated voltage exceeds the third integrated voltage is advanced as the engine speed increases, and the conduction start position of the primary current control switch is advanced as the engine speed increases. As a result, it is possible to prevent the current cutoff value from becoming low when the engine rotates at high speed, and there is an advantage that the ignition performance at high speed can be prevented from deteriorating.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram showing an embodiment of the first invention of the present application, Fig. 2 is a waveform diagram showing signal waveforms of each part of Fig. 1, and Fig. 3 explains the action of the speed-up capacitor. FIG. 4 is a circuit diagram showing another configuration example of an ignition circuit to which the present invention can be applied, FIG. 5 is a circuit diagram showing an embodiment of the second invention of the present application, and FIG. 5 is a waveform diagram showing signal waveforms at various parts in FIG. 5. FIG. DESCRIPTION OF SYMBOLS 1... Ignition coil, 2... Spark plug, 3... Transistor (primary current control switch), 4... Signal coil, 5... First pulse shaping circuit, 6... Second
7... Ignition operation permissible interval detection signal generation circuit, 8... First integrating circuit, 9... Reset circuit, 10... Second integrating circuit, 11... Second integrating circuit. 3 integrating circuit, 11a... third integrating capacitor, 11b...
...Third integrating capacitor discharging transistor switch, 11q...Differentiating circuit, 12...First comparison circuit,
13...Second comparison circuit. Procedural amendment (voluntary) October 31, 1985 Michibe Uga, Commissioner of the Patent Office1, Indication of case: Japanese Patent Application No. 60-300572, Title of invention: Ignition device for internal combustion engine 3, Case made by the person making the amendment Relationship with Patent Applicant (134) Kokusan Denki Co., Ltd. 4, Agent 6th Floor 5, Expenditure Building, 14-31-6 Shin 14-31-6, Minato-ku, Tokyo, Column 6 of "Detailed Description of the Invention" of the Specification Subject to Amendment, The statement of contents of the amendment is amended as follows. (1) Page 36, lines 15 to 16, “From position θ3.
··can get. ” is corrected as follows. [The third voltage rises at a constant gradient from position θ3 to minimum advance position θ1 and maintains that voltage until the next maximum advance position θ1.
An integrated voltage Vc3 is obtained. ] (2) Page 48, No. 14
Correct "pulse signal" in the row to "pulse signal". that's all

Claims (8)

[Claims] (1) An ignition coil, a primary current control switch provided on the primary side of the ignition coil, and control to change the primary current control switch from a conductive state to a cutoff state at the ignition timing of the internal combustion engine. In the ignition device for an internal combustion engine, the ignition device for an internal combustion engine obtains a high voltage for ignition by abruptly changing the primary current of the ignition coil by interrupting the primary current control switch, the control circuit comprising: a signal coil that outputs first and second signals that are equal to or higher than a threshold level at a maximum advance position and a minimum advance position of the ignition timing of the engine in synchronization with the rotation; a waveform shaping circuit that shapes the two signals into pulses to obtain a first pulse signal that rises at the maximum advance angle position and a second pulse signal that rises at the minimum advance angle position; a signal storage capacitor; a charging control transistor switch that conducts when a first pulse signal is generated and instantaneously charges the signal storage capacitor; and a charging control transistor switch that conducts when the second pulse signal occurs and instantaneously charges the signal storage capacitor. an ignition operation permissible range detection signal generation circuit that is provided with a discharge control transistor switch for discharging the signal and generates an ignition operation permissible range detection signal that lasts from a maximum advance position to a minimum advance position at both ends of the signal storage capacitor; and a second integrating capacitor that instantly charges the first integrating capacitor to a constant voltage by the terminal voltage of the signal accumulating capacitor at the same time as the voltage across the signal accumulating capacitor rises at the maximum advance position. a first integrating capacitor charging circuit comprising: a first integrating capacitor charging circuit; an additional charging circuit for additionally charging the first integrating capacitor at a constant time constant;
a reset circuit that instantly discharges the integrating capacitor; a second integrating capacitor; a second integrating capacitor charging circuit that charges the second integrating capacitor with a constant time constant; and a collector-emitter circuit that is connected to the second integrating capacitor. a second integrating capacitor discharging transistor switch connected in parallel to the integrating capacitor and conducting when triggered by the second pulse signal; a third integrating capacitor; a third integral capacitor charging circuit that charges the third integral capacitor at a constant time constant;
A differentiating circuit for differentiating the rising edge of the first pulse signal or the rising edge of the ignition operation permissible interval detection signal and a collector-emitter circuit are connected in parallel to the third integrating capacitor and are triggered by the output of the differentiating circuit. a third integrating circuit comprising: a third integrating capacitor discharging transistor switch which is connected for a certain period of time; and a third integrating capacitor whose output terminal is coupled to the control signal input terminal of the primary current control switch; A second integrated voltage Vc2 obtained across the terminals of the third integrating capacitor and a third integrated voltage Vc3 obtained across the third integrating capacitor are input, and the second integrated voltage becomes equal to or lower than the third integrated voltage. a first comparator circuit that prevents conduction of the primary current control switch when the primary current control switch is present and allows conduction of the primary current control switch while the second integrated voltage exceeds the third integrated voltage; , an output terminal of which is coupled to a control signal input terminal of the primary current control switch, and a first integral voltage Vc1 obtained across the first integrating capacitor and a second integrated voltage Vc1 obtained across the second integrating capacitor. The first comparator circuit inputs the integrated voltage Vc2 of the primary current, and allows the primary current control switch to conduct, and while the first integrated voltage is equal to or lower than the second integrated voltage, the first An internal combustion engine characterized by comprising: a second comparison circuit that conducts a current control switch and shuts off the primary current control switch when the first integrated voltage exceeds the second integrated voltage. ignition device. (2) The waveform shaping circuit includes a first pulse shaping circuit that shapes the first signal into a pulse shape to obtain a first pulse signal that rises at the maximum advance position, and a first pulse shaping circuit that shapes the first signal into a pulse shape and obtains a first pulse signal that rises at the maximum advance angle position; A second pulse comprising a waveform shaping transistor that maintains a cut-off state for a period when the voltage is equal to or higher than a short level and maintains a conductive state for another period to obtain a second pulse signal between the collector and emitter of the waveform shaping transistor. The ignition device for an internal combustion engine according to claim 1, characterized in that it comprises a shaping circuit. (3) The first integrating capacitor charging circuit includes a resistor voltage divider circuit that divides the voltage across the signal storage capacitor, and a base coupled to the voltage division point of the voltage divider circuit, and a collector connected to the signal storage capacitor. a first integrating circuit transistor whose emitter is coupled to the positive terminal of the capacitor and the positive terminal of the first integrating capacitor, and a collector-emitter of the first integrating circuit transistor; Claim 1 or 2, further comprising a charging resistor and a speed-up capacitor connected between the base and emitter of the first integrating circuit transistor. The internal combustion engine ignition system described in . (4) The reset circuit includes a reset transistor in which a collector-emitter circuit is connected in parallel to both ends of the first integrating capacitor and whose base is coupled to the collector of the waveform shaping transistor of the second pulse shaping circuit. ,
Claim 2 or 3, characterized in that the capacitor comprises a malfunction prevention capacitor having one end coupled to the collector of the reset transistor and the other end coupled to the collector of the waveform shaping transistor. The ignition device for an internal combustion engine according to any one of the above. (5) An ignition coil, a primary current control switch provided on the primary side of the ignition coil, and control to change the primary current control switch from a conductive state to a cutoff state at the ignition timing of the internal combustion engine. In the ignition device for an internal combustion engine, the ignition device for an internal combustion engine obtains a high voltage for ignition by abruptly changing the primary current of the ignition coil by interrupting the primary current control switch, the control circuit comprising: a signal coil that outputs first and second signals that are equal to or higher than a threshold level at a maximum advance position and a minimum advance position of the ignition timing of the engine in synchronization with the rotation; and the first signal; a waveform shaping circuit that shapes each second signal into a pulse shape to obtain a first pulse signal that rises at the maximum advance angle position and a second pulse signal that rises at the minimum advance angle position; a signal storage capacitor; a charging control transistor switch that conducts when the first pulse signal is generated to instantaneously charge the signal storage capacitor; and a charging control transistor switch that conducts when the second pulse signal is generated and instantaneously charges the signal storage capacitor. an ignition operation permissible range detection signal generation circuit that obtains an ignition operation permissible range detection signal that lasts from the maximum advance position to the minimum advance position at both ends of the signal storage capacitor, and At the same time as the voltage across the first integrating capacitor and the signal storage capacitor rises at the maximum advance position, the first integrating capacitor is instantly charged to a constant voltage by the terminal voltage of the signal storage capacitor. a first integrating capacitor charging circuit; an additional charging circuit for additionally charging the first integrating capacitor at a constant time constant; 1
a reset circuit that instantly discharges the integrating capacitor; a second integrating capacitor; a second integrating capacitor charging circuit that charges the second integrating capacitor with a constant time constant; and a collector-emitter circuit that is connected to the second integrating capacitor. a second integrating circuit comprising a second integrating capacitor discharging transistor switch connected in parallel to the integrating capacitor and turned on when triggered by the second pulse signal; and a third integrating capacitor; a third integrating capacitor charging circuit that charges the third integrating capacitor with a voltage across the signal storage capacitor at a constant time constant; A differentiating circuit for differentiating a rising edge; and a third integrating capacitor discharging transistor switch whose collector-emitter circuit is connected in parallel to the third integrating capacitor and conducts when triggered by the output of the differentiating circuit. a third integrating circuit, the output terminal of which is coupled to the control signal input terminal of the primary current control switch, a second integrating voltage Vc2 obtained across the second integrating capacitor, and the third integrating capacitor; When the second integrated voltage is equal to or lower than the third integrated voltage, the second integrated voltage Vc3 obtained at both ends of the primary current control switch is blocked from conducting. a first comparison circuit that allows conduction of the primary current control switch while the integrated voltage exceeds the third integrated voltage; and an output terminal coupled to a control signal input terminal of the primary current control switch. The first comparator circuit inputs the first integrated voltage Vc1 obtained across the first integrating capacitor and the second integrated voltage Vc2 obtained across the second integrating capacitor, and the first comparing circuit The primary current control switch is made conductive while the current control switch is allowed to be conductive and the first integral voltage is equal to or lower than the second integral voltage, and the first integral voltage is changed to the second integral voltage. An ignition device for an internal combustion engine, comprising: a second comparison circuit that shuts off the primary current control switch when the integrated voltage is exceeded. (6) The waveform shaping circuit includes a first pulse shaping circuit that shapes the first signal into a pulse shape to obtain a first pulse signal that rises at the maximum advance position, and a first pulse shaping circuit that shapes the first signal into a pulse shape and obtains a first pulse signal that rises at the maximum advance angle position; A second pulse comprising a waveform shaping transistor that maintains a cut-off state for a period when the voltage is equal to or higher than a short level and maintains a conductive state for another period to obtain a second pulse signal between the collector and emitter of the waveform shaping transistor. The ignition device for an internal combustion engine according to claim 5, characterized in that it comprises a shaping circuit. (7) The first integrating capacitor charging circuit includes a resistor voltage divider circuit that divides the voltage across the signal storage capacitor, and a base coupled to a voltage division point of the voltage divider circuit, and a collector connected to the signal storage capacitor. a first integrating circuit transistor whose emitter is coupled to the positive terminal of the capacitor and the positive terminal of the first integrating capacitor, and a collector-emitter of the first integrating circuit transistor; Claim 5 or 6, further comprising a charging resistor and a speed-up capacitor connected between the base and emitter of the first integrating circuit transistor. The internal combustion engine ignition system described in . (8) The reset circuit includes a reset transistor in which a collector-emitter circuit is connected in parallel to both ends of the first integrating capacitor, and a base is coupled to the collector of the waveform shaping transistor of the second pulse shaping circuit. ,
Claim 6 or 7, comprising a malfunction prevention capacitor having one end coupled to the collector of the reset transistor and the other end coupled to the collector of the waveform shaping transistor. The ignition device for an internal combustion engine according to any one of the above.