JPS62294772A - Ignition device for internal combustion engine - Google Patents

Abstract

PURPOSE:To satisfy both requirements for starting characteristic of engine and the idling stability by determining the ignition position from angle advance signal obtained from a start signal generator circuit when the engine revolving speed is in the start speed range. CONSTITUTION:When an internal combustion engine is to start, its revolving speed is very low to cause No.2 integral capacitor C2 to be charged to a sufficiently high potential, so that No.2 integral voltage exceeds the reference voltage to allow a speed range sensor circuit 205 to emit a start speed range detection signal. A start angle advance signal generator circuit 204 emits a start angle advance signal in the position where No.1 integral voltage exceeds No.2 integral voltage. In this condition, a start ignition signal generator circuit 206 emits an ignition signal in the position where said start angle advance signal makes a rise. Accordingly the ignition position at starting is advanced by a certain angle from the minimum angle advance position, which ensures good starting characteristics for the engine.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Field of Industrial Application] The present invention provides a method for controlling one of the ignition coils by operating a semiconductor switch.
The present invention relates to an ignition device for an internal combustion engine that controls the secondary current and generates a high voltage for ignition.

[Prior Art] Generally, an ignition device for an internal combustion engine includes an ignition signal generation circuit that outputs an ignition signal for determining the ignition position at the ignition position of the internal combustion engine, an ignition coil, and a primary current control semiconductor that operates based on the ignition signal. A primary current &Il ti that is equipped with a switch, and that the primary current of the ignition coil is suddenly changed by the operation of the semiconductor switch to induce a high voltage for ignition on the secondary side of the ignition coil.
n circuits.

[Problems to be solved by the invention] In this type of conventional ignition system, the ignition signal generation circuit is provided with various characteristics to provide advance and retard characteristics in the medium and high speed range of the engine. However, it was only possible to maintain the ignition position constant at low engine speeds. For example, when an ignition signal generation circuit is used that outputs an ignition signal having an advance characteristic that advances the ignition position as the rotational speed increases in the medium to high speed region of the engine, the settings are as shown in Figure 3. The ignition position is constant in the area where the rotational speed is less than N1, and the ignition position is constant in the area where the rotational speed is less than the set rotational speed N1.
The ignition position is advanced in the range below N2, and becomes constant again in the range exceeding the set rotational speed N2.

In order to improve the starting performance of the internal combustion Ii engine, it is necessary to advance the ignition position at low speeds, and on the other hand, in order to stabilize the idle link, it is necessary to retard the ignition position. However, with conventional ignition systems, it was not possible to advance or retard the ignition position in the low speed range, so a compromise was sought and the ignition position in the low speed range was determined to be a constant position, which improved engine startability. It has been difficult to obtain an internal combustion engine that is excellent in both engine speed and idling stability. In particular, in the case of an engine that often continues to operate at a low rotational speed near the idling speed, such as an outboard motor used for trolling, idling stability becomes a problem.

An object of the present invention is to provide an ignition device for an internal combustion engine that can satisfy both engine startability and idling stability.

Means for Solving Problem L] In order to achieve the above object, the present invention provides an ignition signal that determines the operating position (ignition position) of a primary current control semiconductor switch that controls the primary current of the ignition coil. The ignition signal generation circuit that generates the ignition signal was constructed from the following elements.

(a) Using the first signal and second signal that the signal coil outputs at the maximum advance position and minimum advance position as input, outputs an ignition interval signal that lasts from the maximum advance position to the minimum advance position. Ignition interval signal generation circuit.

(b) Controlled by the ignition interval signal, the first integral capacitor is charged with a constant time constant from the maximum advance angle position to the minimum advance angle position, and the first integral capacitor is discharged at the minimum advance angle position. a first integration circuit that performs an integration operation to

(C) Using the ignition interval signal as input, charging the second integral capacitor from each minimum advance angle position to the maximum advance angle position with a constant time constant, and charging the second integral capacitor from the maximum advance angle position to the minimum advance angle position. The second voltage is maintained at the minimum advance position.
a second integrating circuit that performs an integrating operation to discharge an integrating capacitor;

(d) The first integrated voltage obtained across the first integrating capacitor and the second integrated voltage obtained across the second integrating capacitor are compared so that the first integrated voltage becomes the second integrated voltage. A starting advance angle signal generation circuit that outputs a starting advance angle signal when the above value is reached.

(e) A second integrated voltage, an ignition interval signal, and a reference voltage are input, and the second integrated voltage is compared with the reference voltage, and while the ignition interval signal is generated, the second integrated voltage is the reference voltage. A starting rotational speed region detection signal is output when the voltage is higher than the reference voltage, and a steady operating speed region detection signal is output when the second integrated voltage is below the reference voltage while the ignition interval signal is being generated. Speed region detection circuit.

(f) With the output of the starting advance angle signal generation circuit and the output of the speed range detection circuit as inputs, the ignition signal is generated when the starting rotational speed range detection signal is generated and the starting advance angle signal is generated. Start-up ignition signal generation circuit that outputs.

(0) When the ignition interval signal is input, the start-up position is at the minimum advance angle position in the low speed range above the idling speed and below the advance start rotation speed, and the start-up position in the advance angle speed range above the advance start rotation speed and below the advance end rotation speed. A steady-state ignition position screening circuit that outputs a signal for determining a steady-state ignition position that changes from the minimum advance angle position to the maximum advance angle position.

(h) Output an ignition signal when the ignition position' determination signal is generated in a state where the steady-state operating speed region detection signal is generated using the output of the steady-state ignition position calculation circuit and the output of the speed region detection circuit as inputs. Steady-state ignition signal generation circuit.

[Operation of the invention] In the above configuration, at the time of starting the internal combustion mode (in the starting rotational speed region), the rotational speed is extremely low and the second
Since the integrating capacitor of is charged to a sufficiently high voltage,
When the second integrated voltage becomes equal to or higher than the reference voltage, the theft area detection circuit outputs a starting rotational speed area detection signal. In addition, the starting advance angle signal generation circuit generates the starting advance angle signal at the position where the first integrated voltage exceeds the second integrated voltage (a position advanced by a certain angle β from the minimum advance position). Output.

In this state, the starting ignition signal generation circuit outputs an ignition signal at the position where the starting advance angle signal rises. Therefore, as shown in FIG. 4, the ignition position at the time of starting is a position advanced by a certain angle β from the minimum advance angle position, and the startability of the engine is improved.

When the engine starts and rotates at a speed higher than the idling speed, the charging time of the second integrating capacitor becomes shorter and the charging voltage of the second integrating capacitor becomes lower;
Since the second integrated voltage cannot exceed the reference voltage, the speed region detection circuit outputs a steady operation speed region detection signal. In this state, an ignition signal is generated at the rising edge of the signal for determining the ignition position during steady operation output from the ignition position calculation circuit during steady operation. The signal for determining the ignition position during steady operation is
In the low speed range, which is more than the idling rotational speed and less than the advance start rotational speed, the ignition starts at the minimum advance position, so the ignition position during idling is the minimum advance position (maximum retardation position), resulting in good idling stability. Ru. When the rotational speed of the engine reaches its upper limit and enters the advanced angular speed region, the ignition position advances in accordance with the characteristics of the steady-state ignition position enable/stop circuit, as shown in FIG. The advance angle width in this case is the angular width α between the maximum advance angle position and the minimum advance angle position.

Depending on the internal combustion engine, it may be necessary to retard the ignition position in a high-speed range that exceeds the advanced angular speed range, but in that case, in steady operation It is sufficient to add a retard function that generates a signal whose position is retarded. In this way, the present invention does not preclude addition of calculation functions other than the advance angle calculation function to the ignition position calculation circuit.

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

FIG. 1 shows one embodiment of the present invention, and the ignition device of this embodiment is composed of an ignition circuit 1 and an ignition signal generation circuit 2. As shown in FIG. The configuration of each part of this embodiment will be explained in sections below.

[I] Configuration of ignition circuit 1 In this embodiment, the present invention is applied to an ignition device for two cylinders that alternately ignites two cylinders at 180 degree intervals. 101 and 102, NPN transistors 103 and 104 whose collectors are connected to one ends of the primary coils of the ignition coils 101 and 102, respectively; It consists of spark plugs 105 and 106 loaded on the secondary coil 102, and a flip-flop circuit 107 in which a positive f2i R output terminal Q and a negative logic output terminal ◇ are connected to the bases of transistors 103 and 104, respectively. The emitters of transistors 103 and 104 are grounded, and transistor 103 of the primary coils of ignition coils 101 and 102
The terminal opposite to 104 is connected to a positive output terminal B of a battery (not shown) whose negative output terminal is grounded.

In this example, transistors 103 and 104 are Darlington-connected composite transistors, and these transistors constitute a semiconductor switch for primary current control. A primary current control circuit is configured to control the primary current of.

The flip-flop circuit 107 has a control terminal 107a, and the stable state is reversed every time the ignition signal V8 is input to the control terminal 107a. When the potentials of the Q terminal and the ◇ terminal of this flip-flop circuit are at a high level and a low level, respectively, a base current flows through the transistor 103 and no base current flows through the transistor 104, so the transistor 103 is conductive. Transistor 104 is cut off. At this time, the primary coil of the ignition coil 101 and the transistor 10 are connected to the battery (not shown).
A current flows between the collector and emitter of 3. When an ignition signal is applied to the control tiII terminal 107a in this state, the potential of the Q terminal becomes a low level and the potential of the ◇ terminal becomes a high level, so that no base current flows to the transistor 103, and a base current flows to the transistor 104. starts to flow. Therefore, transistor 103 is turned off and transistor 104 is turned on. By shutting off the transistor 103, a high voltage is induced in the primary coil of the ignition coil 101, and this voltage is further boosted to induce a high voltage for ignition in the secondary coil of the ignition coil 101. Since this high voltage is applied to the spark plug 105, a spark is generated in the spark plug, and the 10th cylinder between the layers is ignited. Further, when the transistor 104 becomes conductive, a primary current flows from a battery (not shown) through the ignition coil 1020 primary coil and the rectifier-emitter of the transistor 104. When the next ignition signal is applied to the control terminal 107a of the flip-flop circuit 107, the potential of the Q terminal of the flip-flop circuit 107 becomes high level, and the potential of the ◇ terminal becomes low level. As a result, the transistor 104 is turned off, a high voltage for ignition is induced on the secondary side of the ignition coil 102, a spark is generated in the ignition plunger 106, and the second cylinder of the engine is ignited. Also, as the potential of the Q terminal becomes high level, the transistor 10
3 becomes conductive, and a primary current flows through the ignition coil 101. The same operation is repeated thereafter, and the flip-flop circuit 107
0 control terminal 107a every time the ignition signal is applied to the 10th control terminal 107a.
The cylinder and the second cylinder are fired alternately.

The ignition circuit used in the present invention includes an ignition coil and a semiconductor switch for controlling the primary current that operates when an ignition signal is applied, and the operation of the semiconductor switch suddenly changes the primary current of the ignition coil to ignite. Any circuit may be used as long as it includes a primary current control circuit for obtaining a high voltage for ignition on the secondary side of the coil, and is not limited to the example shown in FIG. 1. For example, the ignition circuit shown in Figure 1 is a current interrupt type circuit that uses a battery as a power source, but the ignition circuit that uses a current interrupt type ignition circuit that uses an exciter coil installed in a magnet generator driven by an internal combustion engine as a power source. A capacitor discharge type ignition circuit that induces a high voltage for ignition by discharging a capacitor charged by the output of an exciter coil to the primary coil of the ignition coil through a thyristor (semiconductor switch for primary current control). But that's fine.

[I11 Configuration of ignition signal generation circuit 2 Ignition signal generation circuit 2 that supplies an ignition signal to the above ignition circuit
The ignition interval signal generation circuit 201 and the first integration circuit 2
02, a second integration circuit 203, a signal generating circuit for advance angle at starting 204, a speed region detecting circuit 205, a ignition signal generating circuit 206 at starting, and a ignition position control circuit 20 at steady state.
7 and a steady-state ignition signal generation circuit 208. Each of these parts will be explained below.

(a) Ignition interval signal generation circuit 201 The ignition interval signal generation circuit 201 includes signal coils Wsa and W.
Waveform shaping circuit 201A that receives the outputs of sb as inputs, respectively.
and 201B, and a flip-flop circuit FFI.

The signal coils WSa and wsb are installed in a signal generator attached to the internal combustion engine, and the signal coil Wsa is used to control the maximum advance angle position θ1a and the minimum advance angle position θ1a of the first cylinder of the internal combustion engine, as shown in FIG. 2A. A first signal 31a and a second signal 32a are generated at the angular position θ2a, respectively, and the signal coil W
As shown in FIG. 2B, Sb is the maximum advance angle position θ1 of the second cylinder, which is 180 degrees behind the signal coil Wsa in phase.
b and the first signal Slb at the minimum advance angle position θ2b, respectively.
and S2b are output.

In this embodiment, the angle at each position is measured toward the advance side with the top dead center of each cylinder of the engine as a reference.

The waveform shaping circuit 201A is configured such that the signal coil Wsa is set to the maximum advance angle position θ1a and the minimum advance angle position θ of the first cylinder of the internal combustion engine.
The first signal 31a and the second signal S2a output at S2a
are converted into pulse signals @p1a and P2a, respectively. In addition, the waveform shaping circuit 201'B sets the signal coil Wsb to the maximum advance angle position θ1b and the minimum advance angle position θ2b of the second cylinder.
A first signal S1b and a second signal S generated respectively at
2b into pulse signals P1b and P2b, respectively.

The flip-flop circuit FFI outputs to its negative logic output terminal Q and positive logic output terminal Q a negative logic ignition interval signal VQ1 and a positive logic ignition interval signal VQ2 that last from the maximum advance angle position to the minimum advance angle position.

These ignition interval signals are signals indicating the interval in which the ignition operation of the internal combustion engine is permitted, and the Q of the flip-flop circuit FF1
Negative logic ignition interval signal Vq obtained from l, ijj
1, as shown in FIG. 2C, becomes low (logic state is "O") at the maximum advance angle position θ1a, and becomes high level (logic state is "1") at the minimum advance angle position θ2a. Further, as shown in the second diagram, the positive logic ignition interval signal VQ2 obtained at the Q terminal of the flip-flop circuit FF1 is at the maximum advance angle position θ.
It becomes a high level at 1a, and becomes a low level at the minimum advance angle position θ2a.

(b) First integrating circuit 202 The first integrating circuit 202 connects the first integrating capacitor C1 and P
NP transistor TRI and NPN transistor TR2
, resistors R1 to R5, and a Zener diode Z1. The first integrating capacitor C1 is connected between the collector of the transistor TR1 and ground, and the base of the transistor TR1 is connected through the resistor R1 to the positive output terminal E of a DC constant voltage power supply (not shown) whose negative output terminal is grounded. ing. The base of transistor TR1 is also connected to the Q of flip-flop circuit FF1 through resistor R2.
The emitter of transistor TR1 is connected to the positive (output terminal E) of a DC power supply (not shown) through resistor R3.
It is connected to the. The collector of the transistor TR2 is connected to the collector of the transistor TRI, and the emitter of the transistor TR2 is grounded. The base of the transistor TR2 is connected to the ◇ terminal of the flip-flop circuit FFI through a resistor R4, and a resistor R5 is connected between the base and emitter of the transistor TR2. A Zener diode Z1 is connected across the first integrating capacitor C1 so that the terminal voltage of the capacitor is limited to the Zener voltage of the Zener diode.

In this first integrating circuit, when the flip-flop circuit FF1 outputs the ignition interval signal Vq1 of negative logic at the maximum advance angle position θ1a or θ1b (when the Q terminal of the flip-flop circuit FF1 is grounded), the transistor A base current flows through TR1, making the transistor TR1 conductive, and the first integrating capacitor C1 is charged with a constant time constant from a DC constant voltage power supply (not shown) through the resistor R3 and the collector-emitter of the transistor TR1. The charging time constant of the capacitor C1 can be adjusted by the resistance value of the resistor R3. Minimum advance angle position θ2a or θ2
When the negative logic ignition interval signal Vq1 disappears at step b (when the Q terminal of the flip-flop circuit FF1 becomes ungrounded), the transistor TR1 becomes cut off and the transistor TR2 becomes conductive instead. Transistor TR2
Due to the conduction of the first integrating capacitor C1, the electric charge of the first integrating capacitor C1 is almost instantaneously discharged. Therefore, the first integrating capacitor C1
As shown in FIG. 2E, the first integrated voltage Vcl applied to both ends of The waveform returns to zero at the position.

(C) Second integrating circuit 203 Second integrating capacitor C2 and PNP transistor TR
3 and NPN transistor TR4, and resistors R6 to R
9 and capacitors C3 and C4. Second
Integrating capacitor C2 is connected between the collector of transistor TR3 and ground, and the base of transistor TR3 is connected to the positive output terminal of a DC constant voltage power supply (not shown) through resistor R6. The base of transistor TR3 is also connected to the Q of flip-flop circuit FF1 through resistor R7.
The emitter of the transistor TR3 is connected to the positive output terminal of a DC power supply (not shown) through a resistor R8. The collector of the transistor TR4 is connected to the collector of the transistor TR3, and the emitter of the transistor TR4 is grounded. transistor TR
The base of transistor TR4 is connected to the Q terminal of flip-flop circuit FF1 through capacitor C3, and resistor R9 and capacitor C4 are connected in parallel between the pace emitter of transistor TR4.

In this second integration circuit, when the Q terminal of the flip-flop circuit FF1 is grounded (when the positive logic ignition interval signal Vq2 is not generated), the transistor TR3
A base current flows through the transistor TR3, and the transistor TR3 becomes conductive.
The second integrating capacitor C2 is charged at a constant time constant from a DC constant voltage power supply (not shown) through the resistor R8 and the collector-emitter of the transistor TR3. The charging time constant of this capacitor C2 can be adjusted by the resistance value of resistor R8.

When a positive logic ignition interval signal Vq2 is generated at the maximum advance angle position θ1a or θ1b (when the Q terminal of the flip-flop circuit FF1 becomes ungrounded), the transistor TR3 becomes '
A is turned off, and charging of the capacitor C2 is stopped.

At the maximum advance angle position θ1a or θ1b, the ignition interval signal Vql obtained at the φ terminal of the flip-flop circuit FF1 falls to zero, but since no base current is given to the transistor TR4 at the fall of this signal j3VQ1, ~Resistor TR4 is not conductive and capacitor C2 is not discharged. Next, when the 0 terminal of the flip-flop circuit FFI becomes ungrounded at the minimum advance angle position θ2a or θ2b (the negative logic ignition interval signal Vq1 disappears), this signal V
The rising edge of Q1 is differentiated by a differentiating circuit comprising capacitor C3 and resistor R9, and a pulsed base current is applied to transistor TR4, which instantaneously becomes conductive. This instantaneous conduction of transistor TR4 causes the charge in second integrating capacitor C2 to be discharged. Therefore, the second integrated voltage Vc2 applied 1q across the second integrating capacitor C2 changes from each minimum advance position θ2a or θ2b to the maximum advance position 01, as shown in FIG. 2E.
The waveform has a constant slope up to a or θ1b, holds the voltage from the maximum advance angle position to the minimum advance angle position, and returns to zero at the minimum advance angle position.

(d) Start-up advance angle signal generation circuit 204 The start-up advance angle signal generation circuit 204 is connected between the comparator CM1, the output terminal of the comparator, and the positive output terminal E of a DC power supply (not shown). and an AND circuit A1 which receives as input the output of the comparator and the ignition period signal Vq2 of positive logic obtained at the Q terminal of the flip-flop circuit FF1. A first integrated voltage Vc1 and a second integrated voltage VC2 are input to the input terminals, respectively.

The comparator cM1 compares the first integrated voltage MCI and the second integrated voltage Vc2, and when the first integrated voltage VC1 becomes equal to or higher than the second integrated voltage Vc2, the comparator cM1 outputs a signal as shown in FIG. The AND circuit A1 outputs the starting advance angle signal ■3 as shown in FIG. 2. As will be described later, the rising position θ3 of this signal 3 becomes the ignition position at the time of starting, and this ignition position θ3 is advanced by a certain angle β from the minimum advance position θ2a or θ2b.

The amount of advance β of the ignition position at the time of starting is determined by the first integrating circuit 2.
It can be set appropriately by adjusting the resistance values of the resistor R3 of 02 and the resistor R8 of the second integrating circuit 203 and adjusting the charging time constants of the first and second integrating capacitors.

(e) Speed region detection circuit 205 The speed region detection circuit 205 includes a comparator CM2 and a comparator C.
A resistor R11 connected between the output terminal of M2 and the output terminal E of the DC power supply, a series circuit of a resistor R12 and a variable resistor R13 connected between the output terminal E of the DC power supply and ground, and a comparator CM2. and a positive logic ignition interval signal VQ2 as inputs. It is input to the phase input terminal and positive phase input terminal.

The reference voltage ■r is set to be smaller than the saturation value of the second integral voltage (in the starting rotational speed region) at extremely low speeds below the idling speed N1, and when the engine rotational speed increases and the engine speed reaches the idling region. When the reference voltage Vr
is larger than the saturation value of the second integral voltage C2.

Therefore, at extremely low speeds when the engine rotational speed is less than the idling speed N1, the second integrated voltage ■C2 is higher than the reference voltage ■r, and the comparator CM2 maintains the zero level during the entire ignition period. Negative logic speed region detection signal V
Outputs 2. Also, when the engine enters the idling region,
The second integrated voltage VC2 is 33111! Since the voltage becomes lower than the voltage ■r, comparison 11:, it CM 2 outputs a positive logic speed region detection signal ■2''.

2 to the AND circuit is a starting rotational speed region detection signal which is a signal of negative logic when the speed region detection signal V2 of negative logic is generated while the ignition interval signal VQ2 of positive logic is generated.
4, and when a positive logic speed region detection signal V2° is generated while the ignition interval signal VQ2 is being generated, a steady operating speed region detection signal 4°, which is a positive logic signal, is output.

(f) Starting ignition signal generation circuit 206 The starting ignition signal generation circuit 206 includes a negative circuit IN1 that inverts the negative logic starting rotation speed region detection signal V4;
It consists of an AND circuit A3 which receives the starting advance angle signal ■3 and the output of the inverting circuit INI, and the AND circuit A3 detects the starting advance angle signal when the starting rotation speed region detection signal V4 is generated. (2) When 3 occurs, the ignition signal V5 is output as shown in FIG. 2K.

(Q) Steady-state ignition position calculation circuit 207 Steady-state ignition position calculation circuit 207 operates as follows: Advance oil 0 same path 20
It consists of 78 and 4 to the AND circuit.

The advance angle river wave Ω circuit 207A outputs a signal for determining the ignition position in the steady-state operating region where the idling speed is N1 or more.For example, by inputting the ignition interval signals Ql and Vq2, the advance angle is set when the idling speed is N1 or more. In the low-speed U region where the starting rotation speed is less than N2, the rise occurs at the minimum advance position, and in the advance angle speed rtLft region where the advance start rotation speed is N2 or more and the advance end rotation speed is N3 or less, the rise position changes from the minimum advance position to the maximum advance position. It outputs a signal VS for determining the ignition position that changes up to . A lead angle calculation circuit having such characteristics can, for example, calculate the integral voltage that rises to a certain voltage at the maximum advance position and then rises at a constant slope to the minimum advance position, and the integral voltage that rises at a constant slope from each minimum advance position to the next An arithmetic circuit is known that compares the integrated voltage that rises at a constant slope to the minimum advance position and determines the position where the latter integrated voltage exceeds the former integrated voltage as the ignition position. In the present invention, the configuration of this advance angle calculation circuit is arbitrary, and the advance angle starting rotation speed N
Any circuit that has the characteristic of keeping the ignition position constant in a low speed range of less than 2, and advancing the ignition position in an advance speed range of an advance start rotation speed of N2 or more and an advance end rotation speed of N3 or less. But that's fine.

The AND circuit A4 ANDs the signal VS obtained from the advance angle calculation circuit 207A and the ignition interval signal Vq2, and outputs the signal 6 for determining the ignition position during steady operation. This signal
The rising position θi of No. 6 is the ignition position during steady operation above the fitting rotational speed, and this ignition position advances as the rotational speed increases in the advance angle speed region.

(h) Steady-state ignition signal generation circuit 208 The steady-state ignition signal generation circuit 208 consists of an AND circuit A5 that receives the steady-state operating speed ita detection signal 4' and the steady-state human position determination signal 6. The circuit outputs the ignition signal 7 as shown in FIG. 2M when the ignition position determination signal V6 during steady operation is generated in a state where the steady operation speed region detection signal 4° is generated.

This ignition signal 7 is an OR circuit with ignition signal 5
1, and the OR circuit ORI supplies the ignition signal 8 to the control terminal 107a of the -flip-flop circuit 107 of the ignition circuit 1 every time the ignition signal v5 or 7 is generated.

[Effects of the Invention] As described above, according to the present invention, there is provided a starting ignition signal generation circuit which determines the advance angle position at starting, and whether the engine rotational speed is in the starting rotational speed range or in the steady rotational speed range. When the speed range detection circuit detects the starting rotation speed range, the ignition position is determined by the advance signal sent from the start signal generation circuit. It is possible to advance the ignition position at the time of starting, and retard the ignition position to the minimum advanced position when the engine enters the idling range after completion of starting. Therefore, there is an advantage that both engine startability and idling stability can be improved.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram showing one embodiment of the present invention, and Fig. 2 is a circuit diagram showing an embodiment of the present invention.
Figure 3 is a diagram showing the ignition characteristics obtained by the conventional ignition system for an internal combustion engine, and Figure 4 shows an example of the ignition characteristics obtained by the ignition system for an internal combustion engine according to the present invention. It is a line diagram. 1... Ignition circuit, 2... Ignition signal generation circuit, 201
...Ignition interval signal generation circuit, 202...First integration circuit, 203...Second integration circuit, 204...Starting advance signal generation circuit, 205...Speed region detection circuit , 206... Starting ignition signal generation circuit, 207...
Steady state ignition position calculation circuit, 208...Steady state ignition signal generation circuit. Figure 2 Figure 3 Figure 4 N→ [YPrrLJ

Claims (1)

[Scope of Claims] A signal coil that generates first and second signals that are equal to or higher than a threshold level at a maximum advance angle position and a minimum advance angle position, respectively, of an internal combustion engine; an ignition signal generation circuit that generates an ignition signal for position determination; an ignition coil; and a semiconductor switch for primary current control that operates when the ignition signal is generated; An ignition device for an internal combustion engine comprising a primary current control circuit that suddenly changes current to obtain a high voltage for ignition on the secondary side of an ignition coil, wherein the ignition signal generation circuit includes the first signal and the second signal. an ignition interval signal generation circuit that receives a signal as input and outputs an ignition interval signal that lasts from the maximum advance position to the minimum advance position; a first integrating circuit that performs an integral operation of charging a first integrating capacitor with a constant time constant until then and discharging the first integrating capacitor at the minimum advance angle position, and receiving the ignition interval signal as an input; The second integral capacitor is charged with a constant time constant from each minimum advance angle position to the maximum advance angle position, and the voltage of the second integral capacitor is maintained from the maximum advance angle position to the minimum advance angle position, and the voltage of the second integral capacitor is maintained from the maximum advance angle position to the minimum advance angle position. a second integrating circuit that performs an integrating operation of discharging the second integrating capacitor at a second integrating circuit; a first integrating voltage obtained across the first integrating capacitor; 2
a starting advance angle signal generating circuit that outputs a starting advance angle signal when a first integrated voltage becomes equal to or higher than a second integrated voltage by comparing the integrated voltage of the second integrated voltage; The second integrated voltage is compared with the reference voltage using the ignition interval signal and the reference voltage as input, and when the second integrated voltage is equal to or higher than the reference voltage while the ignition interval signal is generated, the starting rotation is started. a speed region detection circuit that outputs a speed region detection signal, and outputs a steady operation speed region detection signal when the second integrated voltage is equal to or lower than the reference voltage while the ignition interval signal is being generated; The output of the time advance signal generation circuit and the output of the speed range detection circuit are input, and an ignition signal is output when the start time advance signal is generated while the starting rotation speed range detection signal is being generated. and a starting point ignition signal generation circuit that receives the ignition interval signal as input, rises at the minimum advance position in a low speed range above the idling speed and below the advance start rotation speed, and rises at the minimum advance position in the low speed range above the idling speed and below the advance end rotation speed. a steady-state ignition position calculation circuit that outputs a signal for determining the steady-state ignition position in which the rise position changes from the minimum advance position to the maximum advance position in the advance angle speed region; and a steady-state ignition signal generation circuit that receives the output of the region detection circuit as an input and outputs an ignition signal when the ignition position determination signal is generated while the steady-state operating speed region detection signal is being generated. An ignition device for an internal combustion engine characterized by: