JPS62228670A - Ignition device for internal combustion engine - Google Patents

Abstract

PURPOSE:To simplify a circuit structure by comparing the first integral voltage with the second and third integral voltage, generating a trigger signal, and obtaining spark advance angle and spark delay angle characteristics via a common trigger signal output circuit for spark advance angle and spark delay angle control. CONSTITUTION:The first integral voltage Vc1 and the maximum spark advance angle position is constant, but the first integral voltage Vc1 at the minimum spark advance angle position is gradually decreased as the rotating speed is increased. The second integral voltage Vc2 at the maximum spark advance angle position is increased as the rotating speed is increased. The third integral voltage Vc3 at the maximum spark advance angle and the minimum spark advance angle is decreased as the rotating speed is increased. Accordingly, the first integral voltage Vc1 is compared with the second and third integral voltage Vc2, Vc3 so that a trigger signal is generated when the voltage Vc1 becomes higher than both Vc2 and Vc3. Then, various ignition characteristics that the spark angle is advanced at low and medium-speed regions and delayed at a high-speed region can be obtained by properly setting the integration constant of each integrating circuit.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an ignition device for an internal combustion engine used to ignite the engine.

[Prior Art] Generally, an ignition device for an internal combustion engine is composed of an ignition circuit and an ignition position control circuit. The ignition circuit is a CI ignition coil composed of a primary coil and a secondary coil wrapped around an iron core.
a semiconductor switch that operates when an l-trigger signal is applied to cause a change in the primary current of the ignition coil; and the operation of the semiconductor switch applies a high voltage for ignition to the secondary coil of the ignition coil. to occur. The ignition position control circuit controls the ignition position by controlling the timing at which a trigger signal is applied to the semiconductor switch according to the rotational speed of the internal combustion engine.

In general, internal combustion engines require characteristics in which the ignition position is constant in the extremely low speed range, the ignition position is advanced in the low to medium speed range, and the ignition position is characterized in the high speed range.

However, depending on the engine, it may be necessary to have a characteristic that retards the ignition position in the high speed range. For example, in a two-stroke internal combustion engine, it may be necessary to retard the ignition position in a high-speed range in order to improve output characteristics in a high-speed range.

Furthermore, even in a four-stroke internal combustion engine, it may be necessary to retard the ignition position by one angle in a high speed region in order to prevent over-speeding of the I1 engine.

[Problems to be Solved by the Invention] In the conventional ignition system for an internal combustion engine, which has the characteristic of advancing the ignition position in the low-medium speed range of the internal combustion engine and retarding the ignition position in the high-speed range, the ignition position control It is necessary to provide two control circuits, an advance angle control circuit and a retard angle control circuit, in the circuit, resulting in a problem that the circuit configuration becomes ml.

An object of the present invention is to provide an ignition system for an internal combustion engine that can obtain advance and retard characteristics without separately providing advance and retard control circuits.

[Means for solving the problems] As seen in FIG. 1 showing an embodiment of the present invention,
It includes an ignition coil 101 and a semiconductor switch 104 that operates when a trigger signal is applied to cause no change in the primary current of the ignition coil 101, and the operation of the semiconductor switch causes the secondary coil of the ignition coil to In an ignition system for an internal combustion engine, which includes an ignition circuit 1 that obtains a voltage for ignition, and an ignition position control circuit 3 that controls the timing of applying a trigger signal to a semiconductor switch according to the rotational speed of the internal combustion engine, a simple circuit is provided. This configuration allows lead angle and retard angle characteristics to be obtained.

Therefore, in the present invention, the ignition position control circuit 3 is provided with a signal generating means 3A that outputs a maximum advance position signal and a minimum advance position signal that determine the maximum advance position and minimum advance position of the internal combustion engine, respectively; - first to third integration circuits 3B to 3D that obtain the first to third integrated voltages VCI to Vc3; A trigger signal output circuit 3E for angle retard control and a minimum advance position 1-trigger circuit 3F for determining the ignition position at extremely low speeds of the engine are provided.

The first integrating circuit 3B has a first integrating capacitor and a first integrating capacitor control circuit that receives the output of the signal generating means and controls charging and discharging of the first integrating capacitor, and At the advance angle position, the first integral capacitor is almost instantaneously charged to a constant voltage, and the first integral capacitor is charged at a constant time constant to the minimum advance position. An integral operation is performed to discharge the battery.

The second integrating circuit 3C has a second integrating capacitor and a second integrating capacitor (control circuit) that receives the output of the signal generating means as input and controls charging and discharging of the second integrating capacitor. , at each minimum advance angle position, an integral operation is performed in which the second integral capacitor is almost instantaneously charged to a constant voltage and then discharged at a constant time constant to the subsequent minimum advance angle position.

The integrator circuit 3D of the lever 3 includes a third integrator capacitor and a third integrator capacitor υ control circuit that receives the output of the signal generating means as input and controls charging and discharging of the third integrator capacitor. The third integral capacitor is charged at a constant time constant from each minimum advance position to the next minimum advance position, and the third integral capacitor is almost instantaneously discharged between the ignition position and the next minimum advance position. performs an integral operation to

The lead angle R angle control circuit 1 to trigger signal output circuit 3E converts the first integrated voltage obtained across the first integrating capacitor to the second integrated voltage obtained across the second and third integrating capacitors, respectively.
and when the first integrated voltage is higher than both the second integrated voltage and the third integrated voltage as compared with the third integrated voltage, the second integrated voltage and the third integrated voltage are applied to the semiconductor switch.

The minimum advance position 1 trigger circuit 3F provides a trigger signal to the semiconductor switch at the minimum advance position using a minimum advance position signal or a signal corresponding to the minimum advance position signal.

In the above configuration, in the third integrating circuit, if charging is started after instantaneously discharging the third integrating capacitor at each minimum advance angle position, the charging start position is slightly smaller than the minimum advance angle position. However, since this delay is slight, this charging start position can be regarded as the minimum advance position.

When configuring an actual circuit in this way, due to the response time of the circuit components, there may be a slight deviation in the timing at which charging or discharging of each integrating capacitor starts and ends. Even if there is a delay in response caused by circuit technology in this circuit, it is within the scope of the present invention.

[Operation of the invention] In the above configuration, the time from when the minimum advance position signal is generated until the minimum advance position signal is generated, and the time from when each minimum advance position signal is generated to the next minimum advance position signal. The time it takes for this to occur becomes shorter as the rotational speed of the capacitor increases, and as a result, the charging time of the first and third integrating capacitors and the discharging time of the second integrating capacitor decrease. Each becomes shorter. Therefore, the first integrated voltage at the maximum advance position is constant, but the first integrated voltage at the minimum advance position gradually decreases as the rotational speed increases. Further, the second integrated voltage at the maximum advance position increases as the upper limit of the rotational speed increases. Further, the third integrated voltage at each maximum advance angle position and minimum advance angle position becomes lower as the rotational speed increases. Therefore, if the first integrated voltage is compared with the second and third integrated voltages and the trigger signal is not generated when the first integrated voltage becomes higher than both the second and third integrated voltages, each By appropriately setting the integral constant of the integrating circuit, it is possible to obtain various ignition characteristics in which the ignition angle is advanced in the low and medium speed range and retarded in the high speed range.

As described above, according to the present invention, the common advance/retard control unit 1
By comparing the first integrated voltage with the second and third integrated voltages and generating a trigger signal using the helical signal output circuit, the lead angle and retard angle characteristics are improved by 1!7, which simplifies the circuit configuration. be able to.

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

FIG. 1 shows the overall configuration of an embodiment of the present invention. In the figure, 1 is an ignition circuit, and 2 is a magnet generator driven by an internal combustion engine, which is arranged in synchronization with the rotation of a compensator. 3 is an ignition position control circuit; 4 is a power supply circuit that outputs a voltage for operating the ignition position control circuit 3 using the output of the exciter coil 2;

The ignition circuit 1 in this embodiment is a well-known capacitor discharge type circuit, and includes a primary coil 101a and a primary coil 101a whose one end is grounded.
Next coil 101b to the right Ignition coil JL, 101, t
The ignition coil 101 is attached to the cylinder of iI311.
When the spark plug 102 connected to the secondary coil and the ignition energy storage capacitor 103 provided on the primary side of the ignition coil are electrically connected, the charge in the capacitor 103 is discharged to the primary coil 101a of the ignition coil. A discharge control cyrisk (semiconductor switch) 104 provided as shown in FIG.
and a capacitor charging diode 105 that charges the capacitor 103 with the induced voltage of the exciter coil 2 in the direction of the arrow shown in the figure. In this ignition circuit, the capacitor 103 is charged through the diode 105 by the output of the exciter coil 2 to the polarity shown, and then when a trigger signal is given to the thyristor 104, the thyristor 104 is charged to the capacitor 103 by the conductor iuT L/. is discharged to the primary coil 101a of the ignition coil.

This causes a large magnetic flux change in the iron core of the ignition coil, and a high voltage is induced in the secondary coil 101b. Since this high voltage is applied to the ignition plug 102, a spark is generated at the ignition plug and the engine is ignited. That is, in this ignition circuit, the ignition operation is performed when the thyristor 104 is 1-triggered and operated.

The ignition circuit used in J3 of the present invention is not limited to the one shown in this embodiment, but may include an ignition coil and a semiconductor switch that operates when a trigger signal is applied to cause a change in the primary current of the ignition coil. If the circuit obtains high voltage for ignition to the secondary coil of the ignition coil by the operation of the semiconductor switch, it would be good. For example, a current flowing through a coil (the primary coil of the ignition coil or a coil provided separately from the primary coil) is induced in the coil by cutting off the current at the flaming position using a semiconductor switch. Various current-interrupting type ignition circuits can be used to obtain a high voltage for ignition by applying the R voltage to the ignition coil.

The ignition position control circuit 3 includes a semiconductor switch (
In the above example, the ignition position is controlled by controlling the timing of applying a trigger signal to the thyristor 104) according to the rotational speed of the internal combustion engine, and this ignition position control circuit 3
are a signal generating means 3A that outputs a maximum advance position signal and a minimum advance position signal that determine the maximum advance position and minimum advance position of the internal combustion engine, respectively, and first to third integral voltages V.
First to third integrating circuits 3B that obtain C1 to Vc3
3D and the first to third integrated voltages as inputs and a trigger signal VC+ applied to the semiconductor switch of the ignition circuit 1.
a trigger signal output circuit 3E for lead/retard control that outputs;
It is composed of a minimum advance angle position 1 which determines the ignition position at extremely low speeds of the engine and a trigger circuit 3F.

Referring to FIG. 2, there is shown an embodiment that embodies the configuration of FIG. 1 above.

In FIG. 2, the configuration of the ignition circuit 1 is basically the same as that shown in FIG.
A protective resistor R1 and a capacitor C1 are connected in parallel between the power swords.

The power supply circuit 4 is constituted by a series circuit of a diode D1 connected to both ends of the exciter coil 2, a resistor R2, and an mQ capacitor C2, and a Zener diode Z1 connected in parallel to both ends of the capacitor C2. In this power supply circuit, the power supply capacitor C2 is charged to the polarity shown by the induced voltage of the exciter coil 2 in the direction of the arrow shown in the figure, and the terminal voltage of this capacitor C2 is kept almost constant by the Zener diode Z1. Therefore, a substantially constant DC voltage 10 for operating the ignition position control circuit 3 is applied across the power supply capacitor C2.

Among the components of the ignition position control circuit 3, the signal generating means 3△
consists of a signal coil 300 installed in a signal generator, and one end of the signal coil 300 is grounded. As shown in FIG. 3 Δ, this signal coil 300 generates a maximum advance position signal VSI at the maximum advance position θa between the lines, and outputs a minimum advance position signal Vs2 at the minimum advance position θd. Maximum advance angle position signal ■S1 and minimum advance angle position signal V of this embodiment
s2 consists of pulse-like signals of CaJ polarity and positive polarity, respectively, and the maximum advance angle position Oa and the minimum advance angle position θd
The voltage becomes higher than the threshold cold level Vt.

The first integrating circuit 3B includes a first integrating capacitor C11, and a first integrating capacitor control circuit that controls charging and discharging of the first integrating capacitor Ci1 by inputting a maximum advance position signal and a minimum advance position signal. This first integrating capacitor control circuit consists of transistors Tr1 to Tr1"
r3, capacitor C3°C4, resistors R3 to R5, and diodes D2°D3. The base of the transistor Tr1 is grounded, and the emitter is connected to the non-ground terminal of the signal coil 300 via a diode D2. The collector of the transistor Tr1 is connected to the base of the transistor Tr2, and the emitter of the transistor Tr2 is connected to the non-ground terminal of the power supply capacitor C2. A resistor Ffc3 is connected between the collector and ground of the transistor Tr2, and a voltage dividing circuit consisting of a series circuit of resistors R3 and R4 is connected to both ends of the capacitor C3. A transistor Tr is placed at the voltage dividing point of this voltage dividing circuit.
The base of the transistor C3 is connected to the base of the transistor C3, and the collector of this transistor is connected to the non-ground terminal of the capacitor C3. l-
Capacitor C4 between the collector and base of transistor Tr3
is connected, and a resistor R5 is connected between the collector and emitter. The first integrating capacitor C11 is connected between the emitter of the transistor Tr3 and the ground, and the first integrating capacitor C11 is connected between the emitter of the transistor Tr3 and the ground.
With a terminal voltage of , the first integrating capacitor Ci1 is
is now being charged.

A diode D3 is also connected in parallel between the collector and emitter of the transistor Tr3 with its cathode facing the collector side of the transistor 9Tr3.

The second integrating circuit 3C is a second integrating capacitor control circuit that controls charging of the second integrating capacitor 11 by inputting the second integrating capacitor Ci2, the maximum advance angle position signal, and the minimum advance angle position signal. The second integrating capacitor control circuit includes transistors Tr4. It consists of Tr5, diodes D4 to D6, and resistors R6 and R7. The emitters of transistors 1 to Tr4 are grounded, and the bases are connected to signal coil 3 via resistor R6 and diode D4.
Connected to the non-ground terminal of 00. transistor T
The collector of r4 is connected to the non-ground terminal of the capacitor C3 through a diode D5, and is also connected to the base of a transistor Tr5 through a diode D6, and the emitter of the transistor Tr5 is connected to the power supply capacitor C.
It is connected to the non-grounded terminal of No.2.

A second integrating capacitor Ci2 is connected between the collector of the transistor Tr5 and the ground, and a discharging resistor R7 is connected to both ends of the second integrating capacitor.

Next, the third integrating circuit 3D connects the third integrating capacitor Ci
3, and a third integrating capacitor control circuit that controls charging and discharging of the third integrating capacitor, and the third integrating capacitor control circuit includes a transistor Tr4 and a resistor R6.
, R8 and diodes D4 and D7. One end of the resistor R8 is connected to the non-grounded terminal of the capacitor C2, and a third integration capacitor Ci3 is connected between the other end of the resistor R8 and ground. The non-grounded terminal of the third integrating capacitor 1 Ci3 is connected to the collector of the transistor Tr4 through a diode D7. In this example, the transistor Tr4, the diode D4, and the resistor R6 serve as the components of the second integration circuit and the third integration circuit.

The trigger signal output circuit 3E for advance/retard control includes a programmable unijunction 1-transistor P1 and a resistor R.
9 and diodes D8 and D9, and the cathode of the programmable unidirectional transistor P1 is connected to the gate of the thyristor 104 of the ignition circuit 1 through a resistor R9. The anode of the programmable transistor P1 is connected to the non-ground terminal of the first integrating capacitor C11, and the gate is connected to the second and third integrating capacitors C12 and Ci3 via diodes D8 and D9, respectively. connected to the non-grounded terminal of the

The minimum advance angle position trigger circuit 3F includes a resistor R10, one end of which is connected to the non-ground terminal of the signal coil 300 via a diode D4, and the other end connected to the gate of the thyristor 104. .

In the first integrating circuit 3B, the maximum advance angle position θa
When the coil 300 generates the maximum advance position signal Vs1, the transistors Tr1 and Tr2 become conductive and instantly charge the capacitor C3. When this capacitor C3 is charged, the l-transistor Tr3 becomes conductive. The first integrating capacitor Ci1 is charged instantly. When the terminal voltage of the first integrating capacitor C11 reaches a voltage value of 17, which is obtained by dividing the terminal voltage of the capacitor C3 by resistors R3 and R4, the transistor Tr3 is cut off. Thereafter, the first integrating capacitor C11 is charged at a constant time constant through the resistor R5.

This first integral capacitor 1Cil is connected to the signal coil 300.
generates the minimum advance position signal Vs2 and the transistor Tr
When D4 becomes conductive, it discharges through diodes D3 and D5.

The waveform of the first integrated voltage Vcl obtained across the first integrating capacitor Ci1 is as shown in FIG. The waveform returns to zero at the angular position Od.

In the second integrating circuit 3C, the transistor Tr4 becomes conductive at the minimum advance angle position Od, which causes the transistor Tr5 to become conductive and instantly charges the second integrating capacitor Ci2. Since the transistor Tr4 is conductive only for a very short time while the minimum advance position signal is generated, the second integrating capacitor C12 is charged instantaneously at the minimum advance position and then discharged at a constant time constant through the resistor R7. The second integral voltage V obtained across the second integral capacitor Ci2
The waveform of c2 is as shown in the third diagram, and is a waveform that instantaneously rises to a constant voltage at each minimum advance angle position and then falls at a constant slope.

In the third integrating circuit 3D, the third integrating capacitor +
J-Ci3 is charged with the voltage of power supply capacitor C2 through resistor R8 at a constant time constant. When the transistor Tr4 becomes conductive at the minimum advance angle position, the charge in the capacitor Ci3 is instantly discharged.

The programmable unijunction transistor P1 of the lead angle control trigger signal output circuit 3E has a first integrated voltage Vc1 that is equal to the second and third integrated voltages Vc2 and Vc3.
When the anode voltage becomes higher than the gate voltage, it becomes conductive and supplies a trigger signal to the f-nyristor (semiconductor switch) 104 of the ignition circuit.

The minimum advance angle position 1 to trigger circuit 3F provides a trigger signal to the length iris register 104 of the ignition circuit 1 through the resistor RIO when the output Vs2 of the signal coil 300 exceeds a threshold level at the minimum advance angle position θd.

In the above embodiment, the time from when the maximum advance angle position signal Vs1 is generated until the minimum advance angle position signal Vs2 is generated, and the time from when the maximum advance angle position signal Vs2 is generated to the next minimum advance angle from when the maximum advance angle position signal Vs2 is generated. The time until the position signal Vs2 is generated becomes shorter as the rotational speed of the engine increases. +tCi2
The discharge time of each becomes shorter. Therefore, the first integrated voltage Vcl at the maximum advance position Oa is constant, but the first integrated voltage Vcl at the minimum advance position Vd gradually decreases as the rotational speed increases. Further, the second integrated voltage at the maximum advance position increases as the upper limit of the rotational speed increases. Further, the third integrated voltage Vc3 at each maximum advance angle position and minimum advance angle position becomes lower as the rotational speed increases. Therefore, if the first integrated voltage is compared with the second and third integrated voltages and the trigger signal is generated when the first integrated voltage becomes higher than both the second and third integrated voltages, the following is true: By setting the integral constant of each integral circuit appropriately as shown in the figure, the angle can be advanced in the low and medium speed range.
Various ignition characteristics that are retarded in the high V region can be obtained.

For example, as shown in Fig. 4, when the rotational speed of the internal combustion engine is the advance angle start rotational speed Na or WA (VA is N1), the minimum advance position signal is generated after the maximum advance position signal is generated. The second integrating capacitor C
Since there is sufficient time for discharging i2 and charging time for the third integrating capacitor Ci3, as shown in FIG. 4, when the first integrating capacitor is instantly charged to a constant voltage at the maximum advance position PlOa, The terminal voltage (second integral voltage) VC2 of the second integrating capacitor is lower than the terminal voltage (first integral voltage) Vcl of the first integrating capacitor,
Terminal voltage of the third integral capacitor (third integral voltage) V
Even when c3 reaches the minimum advance angle position θd, it remains higher than the terminal voltage VC1 of the first integrating capacitor.

Therefore, this trigger signal output circuit for relative advance/retard control does not output a trigger signal. At this time, the semiconductor switch of the ignition circuit is triggered from 1 to 1 by the output of the minimum advance position i-register circuit, and the ignition operation is performed at the minimum advance position θd.

When the rotational speed of the internal combustion engine enters the low-medium speed region and the rotational speed N exceeds the advance angle start rotational speed Na and reaches, for example, N2, the first integral voltage VC1 has already reached the second integral voltage Vc2 at the maximum advance position. , and the first integral voltage VC1 exceeds the third integral voltage VC3 at a position where the phase is more advanced than the minimum advanced angle position θd. In such a state, a trigger signal is given to the semiconductor switch of the ignition circuit when the first integrated voltage Vc1 exceeds the third integrated voltage Vc3 at a position of an angle θ1 whose phase is advanced from the minimum advance angle position, Ignition operation is performed at this position θ1. First integrated voltage Vc
Since the position where 1 exceeds the third integrated voltage Vc3 advances as the rotational speed of the engine increases, the ignition position advances as the upper limit of the rotational speed between the lines increases.

If the rotational speed N exceeds the advance end rotational speed Nb, for example N3.
Then, at the maximum advance angle position θa, the first integral voltage Vc1 exceeds the second integral voltage VC2 and becomes equal to or lower than the third integral voltage VC3. In such a state, a trigger signal is generated at the maximum advance angle position θa, and the ignition operation is performed at the maximum advance angle position θa.

When the rotational speed N exceeds the retardation start rotational speed and reaches, for example, N4, the second integral voltage VC2 becomes higher than the first integral voltage VC1 at the maximum advance position θa, and the second integral voltage VC2 becomes higher than the first integral voltage VC1 at the maximum advance position Oa. The first integrated voltage VC1 exceeds the second integrated voltage Vc2 only when the angle θ2 is delayed in phase. Therefore, in this state, the maximum advance angle position θ
The ignition operation is performed at a position at an angle θ2 that is out of phase with a. When the rotational speed N further increases, the position where the first integrated voltage exceeds the second integrated voltage is further delayed, so the ignition position is further delayed, and when it is delayed to the minimum advance position at the set rotational speed Ndl, the ignition position is reached. The retard operation stops and the ignition position becomes constant (minimum advance position).

Examples of ignition characteristics determined by the above ignition device are as follows.

First, the rotation speed at which the first integral voltage and the third integral voltage become equal at the maximum advance position θa (advance end rotation rotation speed) N
From b, the rotation speed at which the first integral voltage and the second integral voltage are equal at the maximum advance position (retard start rotation speed>Ncl
By setting the integration constants (charging time constant or discharging time constant) of the first to third integrating circuits so as to increase The ignition position advances from Na to the advance end rotational speed Nb, the ignition position remains constant from the advance end rotational speed Nbhs to the retardation start rotational speed Nc, and the ignition position remains constant in the region of the retardation end rotational speed Nd or higher. The following characteristics can be obtained.

Also, the rotation speed at which the first integral voltage and the third integral voltage are equal at the maximum advance position θa (advance end rotation speed), and the first integral voltage and the second integral voltage at the maximum advance position is equal to the rotation speed (retard angle start rotation speed) is the same speed Ne
If the integration constants of the first to third integration circuits are set so that A characteristic is obtained in which the ignition position is retarded in the range from the rotational speed Ne to the retardation start rotational speed Nd.

Furthermore, the rotational speed (slower) at which the first integral voltage and the second integral voltage are equal at the maximum advance position is lower than the rotational speed at which the first integral voltage becomes equal to the third integral voltage at the maximum advance position Oa. If the integration constants of the first to third integration circuits are set so that the angle starting rotational speed) is low, as shown by the polygonal line C in FIG. The ignition position is advanced to N[, and the ignition position is retarded in the region from the rotational speed Nf to the retardation start rotational speed No.
In this case, the advance angle operation stops before the angle advances to the maximum advance angle position θa, and shifts to the retard angle operation.

In the above embodiment, the first and third integrating capacitors were discharged to zero voltage at the minimum advance position, but since these capacitors can be set to zero voltage at the moment the ignition operation is performed, It is sufficient to discharge the voltage to zero between the ignition position and the minimum advance position. For example, it is also possible to provide a reset circuit including a switch means which is rendered conductive by a trigger signal supplied to a semiconductor switch of the ignition circuit, so that the first and third integrating capacitors are discharged by the reset circuit.

In the above embodiment, a circuit for discharging the second integrating capacitor to zero voltage is not provided, but the second integrating capacitor is discharged between the ignition position and the minimum advance position, so that the second integral capacitor is discharged from the ignition position to the minimum advance position. A circuit can be provided to reduce the residual charge to zero.

In the above embodiment, the signal generating means 3A is constituted by the signal coil 300, but the signal generating means is constituted by the signal coil 300 and a waveform shaping circuit that converts the output of this signal coil into a pulse with a narrower width. You can also do that.

[Effects of the Invention] As described above, according to the present invention, after increasing to a certain level at the maximum advance position, it rises at a constant slope and reaches zero between the ignition position and the minimum advance position. a first integrated voltage that returns;
A second integrated voltage that rises to a predetermined level at the minimum advance position and then declines at a constant slope, and a second integrated voltage that rises at a constant slope from the minimum advance position and rises from the ignition position to the next minimum advance position. The advance angle is achieved by generating a third integral voltage that returns to zero in between, and by avoiding generating a trigger signal when the first integral voltage becomes higher than both the second integral voltage and the third integral voltage. Since the circuit that obtains the advance angle characteristic and the delay angle characteristic are set to 1! There is no need to separately provide the '76 circuit, and there is an advantage that the circuit configuration can be simplified.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing the overall configuration of an embodiment of the present invention, FIG. 2 is a circuit diagram showing an embodiment embodying the configuration of FIG. 1, and FIG. 3 is a circuit diagram of the embodiment of FIG. Signal waveform diagrams of each part; FIG. 4 is a waveform diagram explaining the advance and retard operations of the embodiment in FIG. 2;
FIG. 5 is a diagram showing an example of advance/retard characteristics obtained by the apparatus of the present invention. 1... Ignition circuit, 2... Exciter coil, 3...
- Ignition timing control circuit, 4... Power supply circuit, 3A... Signal generating means, 3B... First integrating circuit, 3c... Second integrating circuit, 3D... Third integrating circuit , 3E...
Trigger signal output circuit for advance/retard control, 3F: minimum advance position trigger circuit, Cil: first integral capacitor, Ci2: second integral capacitor, Ci3: third integral Condensation 1. Figure 1 Figure 5! 1 Writing amendments n1 April 30, 1986 Michibe Uga, Director General of the Patent Office 1, Indication of the case Patent application 1988-7382 January 2, Title of invention ignition device for internal combustion engine 3, Person making the amendment Case Relationship Patent applicant (134) Kokusan Denki Co., Ltd. 4, Agent 4-31-6 Shinbashi, Minato-ku, Tokyo, 6th floor, 5th floor of the Expenditure Building, Figure 5 of the drawing subject to amendment, %/[If7Ll

Claims (1)

[Scope of Claims] An ignition coil and a semiconductor switch that operates when a trigger signal is applied to cause a change in the primary current of the ignition coil, the secondary coil of the ignition coil being activated by the operation of the semiconductor switch. An ignition device for an internal combustion engine, comprising: an ignition circuit that obtains a high voltage for ignition; and an ignition position control circuit that controls the timing of applying a trigger signal to the semiconductor switch according to the rotational speed of the internal combustion engine. The control circuit includes a signal generating means for outputting a maximum advance position signal and a minimum advance position signal that respectively determine a maximum advance position and a minimum advance position of the internal combustion engine, a first integrating capacitor, and an output of the signal generating means. a first integrating capacitor that controls charging and discharging of the first integrating capacitor by inputting
an integral capacitor control circuit, which charges the first integral capacitor almost instantaneously to a constant voltage at the maximum advance position and then additionally charges the first integral capacitor at a constant time constant from the ignition position. a first integrating circuit that performs an integral operation to discharge the battery up to the minimum advance position; and a second integrating circuit that controls the charging and discharging of the second integrating capacitor by receiving the output of the second integrating capacitor and the signal generating means as input.
and an integral capacitor control circuit, which performs an integral operation of charging the second integrating capacitor almost instantaneously to a constant voltage at each minimum advance angle position and then discharging it at a constant time constant to the next minimum advance angle position. a second integrating circuit for controlling charging and discharging of the third integrating capacitor using inputs of the third integrating capacitor and the output of the signal generating means;
an integral capacitor control circuit that charges the third integral capacitor from each minimum advance position to the next minimum advance position with a constant time constant, and charges the third integral capacitor from each minimum advance position to the next minimum advance position with a constant time constant. a third integrating circuit that performs an integrating operation to return the terminal voltage of the third integrating capacitor to zero; and a first integrated voltage obtained across the first integrating capacitor to the second and third integrating circuits. a trigger signal provided to the semiconductor switch when the first integrated voltage is higher than both the second integrated voltage and the third integrated voltage as compared to the second and third integrated voltages respectively obtained across the capacitor; 1. An ignition device for an internal combustion engine, comprising: a trigger signal output circuit for advance/retard control that outputs a trigger signal, and a minimum advance position trigger circuit that provides a trigger signal to the semiconductor switch based on the minimum advance position signal. .