JPS61283765A - Ignitor for internal-combustion engine - Google Patents

Abstract

PURPOSE:To simplify the circuit constitution by outputting an ignition signal at the time point when the second integration voltage having the wave form which increases by a certain voltage at the max. advance position and rises at a certain gradient reaches the first integration voltage having the wave form which increases by a certain value at the position advancing from the max. advance position and then lowers. CONSTITUTION:A signal coil 5 generates the first and the second signals VS1 and VS2 which become the prescribed threshold values or more at the position having the advanced phase than the max. advance position and at the max. advance position, and the first integration voltage VC1 is obtained by the integration of the signal VS1 which lowers at a certain gradient by the first integration circuit 6a, and the second integration voltage VC2 is obtained by the integration of the signal VS2 which increases at a certain gradient by the second integration circuit 6b. When the integration voltage VC2 reaches VC1, an ignition signal Ig is outputted into the primary current control circuit 3 from a signal output circuit 6c. Therefore, the need for installing a circuit for limiting the ignition timing between the max. and min. advance positions in a signal output circuit is avoided, and the circuit constitution is made simple.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an ignition device for an internal combustion engine that can retard ignition timing in response to an increase in the rotational speed of the engine.

SUMMARY OF THE INVENTION 1 The present invention provides a first integrated voltage that instantaneously increases to a certain voltage at a position advanced from the maximum advance position of an internal combustion engine and then decreases at a predetermined slope, and A second integrated voltage that instantaneously rises to a certain voltage and then rises at a certain slope is obtained, and the first integrated voltage and the second integrated voltage are compared, and the first integrated voltage is To provide an ignition device for an internal combustion engine that can obtain retard characteristics with a simple circuit configuration by generating an ignition signal for determining the ignition timing when the integrated voltage of 2 is reached. It is.

[Prior Art] Depending on the internal combustion engine, it is often necessary to retard the ignition timing in a predetermined rotational speed range.

For example, in a two-stroke engine, by retarding the ignition timing when the engine is running at high speed,
A decrease in the output of II can be suppressed.

Additionally, in order to prevent the engine from overspeeding, it may be necessary to retard the ignition timing at high speeds.

Generally, an ignition device for an internal combustion engine includes an ignition coil, and a primary current control circuit that controls the primary current of the ignition coil by operating a semiconductor switch to induce a high voltage for ignition in a secondary coil of the ignition coil. It is equipped with an ignition signal generation circuit that generates an ignition signal that operates a semiconductor switch at the ignition timing of an internal combustion engine, and by operating the semiconductor switch with the ignition signal, the primary current of the ignition coil is suddenly changed and the ignition coil is activated. In this type of ignition system, the signal generating circuit controls the ignition timing of the engine by controlling the phase in which the ignition signal is generated. can be controlled.

Incidentally, recently there has been a tendency to require accurate control of ignition timing. For example, when retarding the ignition timing when the engine is running at high speed, the retardation starting rotation speed (rpm)
It is necessary to accurately control the ignition timing so that the retard width, the slope of the retard characteristic, etc. have predetermined values. For this reason, electronically controlled signal generating circuits using an integrating circuit and a comparing circuit have come to be widely used as signal generating circuits.

[Problems to be Solved by the Invention] When obtaining a retard characteristic with a conventional ignition system for an internal combustion engine using an integral circuit, as shown in FIG. The integral voltage VC rises at a first slope to the maximum advance position θ1, and rises at a second slope larger than the first slope from the maximum advance position θ1 to the minimum advance position θ2.
The integrated voltage VC was compared with the reference voltage ``r'', and when the integrated voltage VC exceeded the reference voltage ``r'', an ignition signal was generated.In this way, the integrated voltage VC was compared with the reference voltage Vr. By comparison, as the engine speed changes from low speed to high speed in the order of N1 → N2 → N3, the waveform of the integral voltage VC with respect to the angle θ changes as shown in the broken line, solid line, and framed picture in Figure 7, so the integral The position where the voltage VC reaches the reference voltage ■r is the top dead center T as θi゛→θ11→θ12
I will be late to the DC side. However, in this case, at the low speed rotation speed N1 of I11gQ, the position θi'' where the integrated voltage Vc reaches the reference voltage ■r is ahead of the maximum advance position θ1, so the integrated voltage VC is compared with the reference voltage Vr. If the signal obtained by the engine is used directly as the ignition signal, the ignition timing will advance to a position that is further advanced than the maximum allowable advance position at low speeds, making it impossible for the engine to operate normally. It is necessary to provide a circuit for controlling the timing between the maximum advance angle position and the minimum advance angle position in the signal output circuit, which poses a problem in that the circuit configuration becomes complicated.

In addition, in conventional ignition systems, it was not possible to obtain a large retard width unless the phase difference between the first signal and the second signal for detecting the maximum advance position and minimum advance position was large. It is necessary to use a signal generator with a special magnetic pole structure as the signal generator provided with the signal generator, which has the problem of complicating the structure of the signal generator and increasing its cost.

An object of the present invention is to provide an ignition device for an internal combustion engine that can obtain retard characteristics with a simple circuit configuration.

[Means for solving the problems] As seen in FIG. 1 showing an embodiment of the present invention,
an ignition coil 2; a primary current control circuit 3 that controls the primary current of the ignition coil by operating the semiconductor switch 3C to induce a high voltage for ignition in the secondary coil of the ignition coil;
A signal generating means 5 which outputs a first signal Vs1 and a second signal VS2 whose phase is delayed from the first signal in synchronization with the rotation of the internal combustion i leap; Internal combustion II equipped with an ignition signal generation circuit 6 that generates an ignition signal vg that operates a semiconductor switch at the ignition timing of an internal combustion engine.
The ignition device for 1 is characterized in that the signal generating means and the ignition signal generating circuit are constructed as shown below.

That is, the signal generating means 5 used in the present invention is configured such that the second signal VS2 exceeds a threshold level at the maximum advance position of the internal combustion engine. Further, the signal generating circuit 6 instantly charges the first integrating capacitor C3 when the first signal Vsl becomes equal to or higher than the threshold level, and charges the first integrating capacitor C3 until the first signal becomes equal to or higher than the threshold level again. The first integrating circuit 6a performs an integrating operation to discharge the first integrating capacitor C3 with a predetermined discharge current, and the second integrating capacitor C5 is instantly discharged at a position where the second signal Vs2 becomes equal to or higher than the threshold level. a second integrating circuit 6b that performs an integrating operation of charging and then additionally charging the second integrating capacitor to increase the terminal voltage of the second integrating capacitor at a predetermined slope; and a first integrating capacitor C3. and a signal output circuit 6c that compares the terminal voltage with the terminal voltage of the second integrating capacitor C5 and generates an ignition signal when the terminal voltage of the second integrating capacitor reaches the terminal voltage of the first integrating capacitor. It is characterized by:

Further, the second invention of the present application further specifies the configuration of the signal generating means and the first integrating circuit, and in this second invention, the signal generating means 5. When the engine stops, it emits a signal that rotates in synchronization with the internal combustion engine! If a signal coil is disposed within Iff and sequentially outputs a half-cycle signal voltage of a first polarity and a half-cycle signal voltage of a second polarity, the signal coil outputs a half-cycle signal voltage of the first polarity. A cycle signal voltage and a second polarity signal voltage are respectively referred to as the first signal and the second signal. The first integrating circuit 6a also includes a first switching element (T1) that is conductive while the first signal is at a threshold level or higher, and a rectangular wave signal obtained by turning on and off the first switching element. and a second switching element (T2) that instantaneously conducts when triggered by a pulse output by the differentiating circuit at the maximum advance position side and applies a DC voltage to the first integrating capacitor.
and a discharge circuit that discharges the first integrating capacitor C3 with a predetermined current.

[Operation of the Invention] With the above configuration, in the rotation range below the retard start rotation speed, the second integrated voltage rises at the maximum advance position, and at the same time the second integrated voltage becomes the first integrated voltage. , and the second integrated voltage never exceeds the first integrated voltage at a position advanced beyond the maximum advanced angle position. Therefore, the first integral voltage and the second integral voltage are compared in the rotation range below the retardation starting rotation speed, and the ignition signal is generated when the second integral voltage reaches the first integral voltage. However, there is no risk that an ignition signal will be generated at a position advanced beyond the maximum advanced angle position. Therefore, there is no need to provide the signal output circuit with a control circuit for limiting the ignition timing between the maximum advance position and the minimum advance position, and the circuit configuration can be simplified.

Furthermore, the first signal only needs to be generated at a position where the phase is advanced from the maximum advance angle position, and the position where the first signal is above the threshold level and the second signal is above the threshold level. Since the angular width between the two positions may be narrower than the retard width of the engine, a generator coil in a normal signal generator that generates a signal of one cycle per revolution can be used as the signal generating means. , the configuration of the signal generator can be simplified.

Also, with the above configuration, when the engine rotates in reverse,
Since the position at which the ignition signal is generated is much later than top dead center, reverse rotation of the engine can be prevented.

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

FIG. 1 shows an embodiment of the present invention, in which 1 is an exciter coil arranged in a magnet generator driven by an internal combustion engine, 2 is a primary coil 2a whose one end is grounded, and The ignition coil 3 has a secondary coil 2b, and 3 is a primary current control circuit that controls the primary current of the ignition coil 2. The primary current control circuit 3 shown in this example is a capacitor discharge type circuit, and includes a diode 3a whose anode is connected to the non-grounded terminal of the exciter coil 1, and a diode 3a whose one end is connected to the cathode of the diode 3a and whose other end is a diode 3a. An ignition energy storage capacitor 3b is connected to the non-grounded terminal of the secondary coil 2a and charged to the polarity shown in the figure by the output of the exciter coil 1, and an ignition energy storage capacitor 3b is connected between one end of the capacitor 3b and the ground with its cathode facing the ground. A thyristor 3C as a semiconductor switch for primary current control, a resistor 3d connected between the gate and cathode of the thyristor 3C, and a primary coil 2a'
It consists of a diode 3e connected to both ends of the ignition coil 2 with its cathode facing the ground side, and a secondary coil 2 of the ignition coil 2.
A spark plug 7 is connected to b.

This primary current control circuit 3 is known as a capacitor discharge type - circuit, and when the thyristor 3C is turned on, the charge of the capacitor 3b is discharged to the primary coil 2a, and the secondary coil 2b of the ignition coil is used for ignition. A high voltage is induced, and the high voltage is applied to the spark plug 7 to generate an ignition spark. That is, in this ignition device, the conduction timing of the thyristor (primary current control semiconductor switch) 3G is the ignition timing.

4 is a power supply circuit that rectifies and smoothes the output of the exciter coil 1 and outputs a DC voltage.
a and a resistor 4b, a power supply capacitor 4C which is charged by the output of the exciter coil 1 through a diode 4a and a resistor 4b, and a Zener diode 4d which limits the voltage across the capacitor 4C to a constant value.

Reference numeral 5 denotes a signal coil serving as a signal generating means disposed within a signal generator that rotates synchronously with the internal combustion engine.

This signal coil generates a first signal Vs1 and a second signal Vs2 that exceed a predetermined threshold level at a position θ2 whose phase is advanced from the maximum advance position of the internal combustion engine and at a maximum advance position θ1, respectively. In addition, in the Water Manual and Figure 5 of the drawing, the symbols shown at each rotation angle position (with a predetermined suffix attached to θ) indicate the direction from the engine top dead center TDC to each position on the advance side. It shows the angle. In this example,
As shown in FIG. 5(a), the first signal Vs1 consists of a half-cycle signal of negative polarity, and the second signal Vs2 consists of a half-cycle signal of positive polarity. The ignition signal generation circuit 6 receives the second signals Vs1 and VS2 as input and generates an ignition signal that operates the Cyrisk 3C as a semiconductor switch at the ignition timing of the internal combustion engine.
, a second integrating circuit 6b, and a signal output circuit 6C.

The first integrating circuit 6a connects the capacitor C1 and resistor R1 when the negative first signal Vs1 output from the signal coil 5 reaches a threshold level Vt or higher at a position θ2 whose phase is advanced from the maximum advance position. parallel circuit and diode D1
a transistor T1 as a first switching element that becomes conductive when a base current is applied through the transistor T1;
When transistor T2 conducts, a base current is applied through capacitor C2 to conduct the second switching element, and when transistor T2 conducts, the output voltage of power supply circuit 4 (voltage across capacitor 4C) El It consists of a first integrating capacitor C3 that is instantaneously charged through a transistor T2, a resistor R3 connected in parallel to both ends of the capacitor C3, and a resistor R2 and a diode D2 provided to discharge the charge of the capacitor C2. There is.

In this embodiment, a differentiating circuit is configured by a capacitor C2, a resistor R2, and a diode D2, and a differentiating circuit that differentiates a rectangular wave voltage Vq1 generated by turning on and off a transistor (first switching element>TI) is configured, and a first signal A pulse Is (see FIG. 5d) generated by this differentiating circuit when VS1 exceeds a threshold level causes the transistor (first switching element) T2 to become conductive instantaneously.

The second integrating circuit 6b receives a base current through a parallel circuit of a resistor R4 and a capacitor C4 and a diode D3 when the positive second signal VS2 output from the signal coil 5 becomes equal to or higher than a threshold level. A transistor T3 conducts when the transistor T3 conducts, a transistor T4 conducts when a base current is applied through the resistor R5 when the transistor T3 conducts, and a resistor connected between the output terminal of the power supply circuit 4 via the collector-emitter circuit of the transistor T4. A series circuit of R6 and R7, the collector of which is connected to the collector of the transistor T4, and the base connected to the connection point of the resistors R6 and R7, so that when the transistor T4 is conductive, the resistor R6 is connected to the collector of the transistor T4.
a second integrating capacitor C5, to which a charging current is applied through transistor T4 and transistor T5;
It consists of a resistor R8 connected between the collector and emitter of the transistor T5.

The signal output circuit 6C includes a programmable unijunction transistor (hereinafter referred to as PLIT) Pl and a resistor R.
10 and R11. The anode of PUT is connected to the non-grounded terminal of the second integrating capacitor C5,
The gate is connected to the first integrating capacitor C3 via the resistor RIO.
connected to the non-grounded terminal of the Then, the cathode of PUT is connected to the gate (
When PUT PI is conductive, an ignition signal g is applied to the thyristor 3C so that the thyristor becomes conductive (ignition operation is performed).

Next, the operation of the above embodiment will be explained. When the first signal Vs1 becomes equal to or higher than the threshold level at a position θ2 that is advanced from the maximum advance angle position θ1, the transistor T1 becomes conductive, and when the first signal S1 becomes less than the threshold level, the transistor T1 is cut off. do. Therefore, transistor T1
Between the collector and emitter of the first
A rectangular wave signal VQ1 is obtained that lasts for a period in which the signal VSI of is equal to or higher than the threshold level.

When the transistor T1 becomes conductive, the capacitor C2 is connected from the power supply circuit 4 to the emitter base of the transistor T2.
A current flows to charge the capacitor C2. Only while the charging current is flowing through the capacitor C2, the base current flows through the transistor T2, and the transistor T2 becomes conductive instantaneously.

Due to this conduction of the transistor T2, the first integrating capacitor C3 is instantly charged to the output voltage E1 of the power supply circuit 4. When the transistor T2 is cut off, the charge of the first integrating capacitor C3 is discharged through the resistor R3 with a predetermined discharge current. Therefore, the waveform of the terminal voltage of the first integrating capacitor C3 becomes a waveform that rises at the angle θ2 and then falls at a predetermined slope, as shown in FIG. 5(e) or (q).

On the other hand, in the second integration circuit 6b, when the second signal Vs2 output from the signal coil 5 becomes equal to or higher than the threshold level at the maximum advance angle position θ1 of RWJ, the transistor T3 becomes conductive, and the second signal VS2 becomes conductive. Transistor T3 shuts off when T is below a threshold level. Therefore, the waveform of the collector-emitter voltage VQ2 of the transistor T3 becomes a rectangular wave that lasts for a period when the second signal VS2 is equal to or higher than the threshold level Vt, as shown in FIG. 5(C).

During the period when this rectangular wave voltage V(12) is generated, the transistor T4 is conductive. When the transistor T4 is conductive, the second integrating capacitor C5 first connects the power supply voltage E1 to the resistor R.
6 and R7 to the voltage value E2 (<El), and then additionally charged through the resistor R8. The waveform of the terminal voltage Vc2 of the second integrating capacitor C5 is as shown in FIG. 5(e) or ('l).

Note that the first and second integrated voltages VC shown in FIG. 5(e)
The waveforms of Vc1 and Vc2 are waveforms in a rotation region (retard region) in which the ignition timing is delayed. Furthermore, the waveform shown by the broken line in Fig. 5 (Q) is the waveform in the rotation range below the set rotation speed where the ignition timing retardation starts, and is shown in Fig. 5 (i).
The waveform shown by the solid line is the waveform in the rotation range where the retardation ends and the ignition timing becomes constant.

In the above ignition system, if the engine is rotating at a rotation speed lower than the retard starting rotation speed, as shown by the broken line in Fig. 5 (Q), the second integrated voltage ■C2 is at the maximum advance position. θ1
Since the first integrated voltage MCI is reached at the maximum advance angle position, the anode voltage of PUT PI becomes equal to or higher than the gate voltage. Therefore, in the rotation range below the retardation start rotation speed, the PLJT becomes conductive at the maximum advance position θ1, a trigger signal is given to the thyristor 3C, and ignition is performed at the maximum advance position θ1.

When the engine speed reaches the retard start speed N1 or higher and enters the retard region, the second integral voltage is increased at a position θd delayed from the maximum advance position θ1, as shown in FIG. 5(e). Since Vc2 reaches the first integrated voltage VC1, the anode voltage of PUTPl becomes equal to or higher than the gate voltage at a position θd delayed from the maximum advance position, PUT becomes conductive and a trigger signal is given to the thyristor 3c. Therefore, in the retard angle region, ignition is performed at a position θd delayed from the maximum advance angle position θ1. As the engine speed increases, the discharge time of the capacitor C3 becomes shorter, so the first integral voltage VC1 increases, and the second integral voltage VC2 reaches the first integral voltage VC1. The phase is delayed. Therefore, the ignition timing is retarded as the rotational speed increases.

When the engine speed increases to the retard end speed N2, as shown in FIG. 5(g), the second integral voltage Vc2 reaches the first integral voltage VC1 at the minimum advance position θ3. Therefore, the ignition operation is performed at this minimum advance angle position θ3. In the rotation range above this retardation end rotation speed, the second
Since the integrated voltage VC2 cannot reach the first integrated voltage VC1, no ignition signal is generated and the engine is not ignited. Therefore, the engine ignition timing θi
The characteristics of J with respect to the rotation speed N (ROM) are shown in Fig. 6:
I'm going to growl.

In the embodiment described above, by appropriately setting the retardation end rotation speed, it is possible to prevent the engine from overspeeding. If the rotation of the engine is not limited, the retardation end rotation speed should be set to a sufficiently high value.

Furthermore, in the above embodiment, if the ignition signal is supplied to the gate of the thyristor 3C from a path separate from the signal output circuit 6C at the maximum retard position, the ignition timing can be kept constant in the rotation range above the retard range. You can also get properties. For example, in the above embodiment, by supplying a pulse obtained by differentiating the falling edge of the rectangular wave voltage Vq2 to the gate of the thyristor 3d, the ignition timing is fixed at the position of the angle θ4 in the rotation range above the retardation range. be able to.

In the above embodiment, the capacitances a of the capacitors C1 and C5 are each represented by the same sign, and the engine rotational speed is N1. Let α be the angle to the position θ1 where the level is higher than the level, β be the angle from the θ1 position to the ignition timing, let the discharge current of the first integral capacitor C3 be 11, and let the charging current of the second integral capacitor C5 be 12. , ・The first integrated voltage Vc1 and the second integrated voltage VC2 are,
Vcl −El −(11(α+β)/(6NC3))
...(1) Vc2=E2 + (I2 β)/(6NC5)
・(2) “Ignition operation is performed when Vc2=VC1, so in the above two equations, V
If we set c2=V cl and find β, we get β-((C3C5)/(I2 C3+ It C3)
) X(6N (El -E2)-(11/C5)α)
...(3) Here, when N=N1, if we set β=O, then 6 (El
-E2)=(α/N1) (11/C3)...(4
) Substituting equation (4) into equation (3) to find β, β= (
II C5)/ (I2 C3+ 11 C3)Xα(
(N/N1)-1) ... (5) Constant = (11
C5)/ (12G3 +II C5), then β=to α((N/N111) (6)
From equation (6), it can be seen that in order to increase the amount of change in the ignition timing β with respect to the amount of change in the rotational speed N, the angle α should be increased. As in the above embodiment, a differentiating circuit is provided in the first integrating circuit 6a so that discharging of the first integrating capacitor is started immediately after the first signal VSI becomes equal to or higher than the threshold level. For example, since the angle α can be made large even by using the sinusoidal signal Vs1 with a wide signal width, the retard angle can be made large without using a signal generator with a special magnetic pole structure.

In the above embodiment, if we consider that the engine is about to rotate in reverse, the waveform of the signal voltage induced in the signal coil 5 will be as shown by the broken line in FIG. 5(a), and the ignition timing will be G1. The position will be ゛. This ignition position θ1° is a position considerably delayed from top dead center TDC when the engine is reversed.

Therefore, the engine will not fire properly and will be prevented from maintaining reverse rotation.

In the above embodiment, the first signal VS1 was of negative polarity and the second signal Vs2 was of positive polarity.
A similar circuit can be constructed by setting si to positive polarity and making the second signal Vs2 negative polarity.

In the above embodiment, the first integrating capacitor C3 is discharged through the resistor R3, but the first integrating capacitor C3 may be discharged through a constant current circuit.

Further, in the above embodiment, the second integrating capacitor C
Although the capacitor C5 is charged through the resistor R8, the capacitor C5 may be charged through a constant current circuit.

In the above embodiment, a PUT is used as a comparison circuit constituting the signal output circuit 6C, but the signal output circuit can also be constituted using a normal voltage comparator.

As in the above embodiment, the first integrated voltage VC1 has a waveform that rises to a certain voltage at a position advanced from the maximum advance position and then falls at a constant slope, and the voltage remains constant at the maximum advance position θ1. A second integrated voltage VC2 having a waveform that increases at a constant slope after rising to If the output is made, the position where the condition for generating the ignition signal is established between both integral voltages in the rotation range below the retard start rotation speed will not advance beyond the maximum advance position. Therefore, there is no need to provide a control circuit in the signal output circuit to prevent the ignition timing from advancing beyond the maximum advance position in the rotation range below the retard start rotation speed, and the configuration of the signal output circuit can be simplified. .

The power supply circuit 4 used in the above embodiment may be the circuit shown in FIG. In this power supply circuit, exciter coil 1
With an output voltage of negative polarity (half cycle which does not contribute to the charging of capacitor 3, i.e. which does not contribute to the supply of ignition energy) capacitor 4g is charged to the polarity shown through diodes 4e and 4f. When capacitor 4q finishes charging, the charge of capacitor 4Q is transferred to diode 4a.
The capacitor 4C is charged to the polarity shown in the figure. - The terminal voltage of this capacitor 4C is limited to a constant 1iE1 by the Zener diode 4d. The resistor 4h is for discharging the capacitor.

Further, in the above embodiment, the circuit shown in FIG. 3 can also be used as the power supply circuit. In this power supply circuit,
The negative polarity half-cycle output of the exciter coil 1 charges the capacitor 4c to the illustrated polarity through the diode 4a. When the terminal voltage of this capacitor 4c reaches a set value, the Zener diode 4d becomes conductive and supplies an ignition signal to the thyristor 4k, so that the thyristor 4k becomes conductive and bypasses the charging current of the capacitor 41 from the capacitor 41. , the terminal voltage of the capacitor 41 is limited to a constant [El.

In the above embodiment, the present invention was applied to an ignition device equipped with a capacitor discharge type primary current control circuit.
The present invention can also be applied to an ignition device using a current interrupt type primary current control circuit 3 as shown in the figure. In the ignition system shown in FIG. 4, when a positive half-cycle output is generated in the exciter coil 1, the primary coil 2
A base current flows through transistor 3g through a, and transistor 3q becomes conductive. As a result, a short circuit current flows from the exciter coil 1 through the diode 3f and the transistor 3q. Next, when an ignition signal is applied to the gate of the thyristor 3c as a semiconductor switch for primary current control, the thyristor 3c becomes conductive and the transistor 3q
to be cut off. Since the current flowing through the exciter coil 1 is cut off, a high voltage is induced in the exciter coil, and this voltage is further boosted by the ignition coil 2 and applied to the spark plug P. Therefore, in this ignition device as well, the ignition operation is performed when the thyristor 3C is conductive.

Note that elements other than thyristors can also be used as the primary current control semiconductor switch. For example, the thyristor 3c in FIG. 4 can be replaced with a transistor.

[Effects of the Invention] As described above, according to the present invention, the first integrated voltage Vc1 has a waveform that rises to a certain voltage at a position where the phase is advanced from the maximum advance angle position θ1, and then falls at a certain slope. and a second integrated voltage Vc2 with a waveform that rises to a certain voltage at the maximum advance position θ1 and then rises at a predetermined slope.The two integrated voltages are compared, and the second integrated voltage is compared with the first integrated voltage. Since the ignition signal is output when the integral voltage is reached, the conditions for generating the ignition signal between the two integral voltages are met at a position advanced from the maximum advance position in the rotation range below the retard start rotation speed. It never happens. Therefore, there is no need to provide the signal output circuit with a control circuit for limiting the ignition timing between the maximum advance angle position and the minimum advance angle position, so there is an advantage that the circuit configuration can be simplified. Also, the first signal only needs to be generated at a position where the phase is advanced from the maximum advance angle position, and the position where the first signal is equal to or higher than the threshold level and the second
Since the angular width between the position where the signal exceeds the threshold level may be narrower than the retard width of the engine, the signal generating means can be a normal signal generator that generates a signal of one cycle per revolution. The onboard generator coil can be used,
The configuration of the signal generator can be simplified. Furthermore, according to the present invention, when the IN11 is about to rotate in reverse, the position at which the ignition signal is generated is considerably delayed from top dead center, so there is the advantage that reverse rotation of the engine can be prevented. be.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an embodiment of the present invention, FIGS. 2 and 3 are circuit diagrams showing different modifications of the power supply circuit used in the embodiment of FIG. 1, and FIG. 4 is a circuit diagram showing an embodiment of the present invention. 5 is a signal waveform diagram of each part to explain the operation of the embodiment of FIG. 1, and FIG. 6 is a circuit diagram showing another example of an ignition device to which the embodiment of FIG. FIG. 7 is a diagram illustrating the operation of a conventional electronically controlled ignition system. 1... Exciter coil, 2... Ignition coil, 3...
...Primary current control circuit, 4...Power supply circuit, 5...Signal coil, 6...Signal generation circuit, 6a...First integration circuit, 6b...Second integration circuit, 6C...signal output circuit, VSl...first signal, VS2...second signal, VCI...first integrated voltage, Vc2...second
The integral voltage of

Claims (2)

[Claims] (1) An ignition coil, a primary current control circuit that controls the primary current of the ignition coil through the operation of a semiconductor switch to induce a high voltage for ignition in a secondary coil of the ignition coil, and signal generating means for synchronously outputting a first signal and a second signal whose phase is delayed from the first signal; and an ignition signal generating circuit that generates an ignition signal for operating a switch, wherein the signal generating means is configured to generate the second signal at the maximum advance position of the internal combustion engine.
The ignition signal generating circuit is configured to make the first signal equal to or higher than the threshold level, and the ignition signal generation circuit instantaneously charges the first integrating capacitor when the first signal becomes equal to or higher than the threshold level. a first integrating circuit that performs an integrating operation of discharging the first integrating capacitor with a predetermined discharge current until the signal reaches the threshold level again; and The second integrating capacitor is charged instantaneously at the maximum advance angle position, and then the second integrating capacitor is additionally charged to perform an integrating operation in which the terminal voltage of the second integrating capacitor is increased at a predetermined slope. A second integrating circuit compares the terminal voltage of the first integrating capacitor with the terminal voltage of the second integrating capacitor, and when the terminal voltage of the second integrating capacitor reaches the terminal voltage of the first integrating capacitor, An ignition device for an internal combustion engine, comprising a signal output circuit that generates an ignition signal. (2) An ignition coil, a primary current control circuit that controls the primary current of the ignition coil through the operation of a semiconductor switch to induce a high voltage for ignition in a secondary coil of the ignition coil, and rotation of the internal combustion engine. a signal generating means for outputting a first signal and a second signal whose phase is delayed from the first signal in synchronization with the first signal; An ignition device for an internal combustion engine comprising an ignition signal generation circuit that generates an ignition signal for operating a semiconductor switch, wherein the signal generation means is disposed in a signal generator that rotates in synchronization with the internal combustion engine, and the signal generation means is disposed in a signal generator that rotates in synchronization with the internal combustion engine, and the signal generator has a first polarity. a signal coil that sequentially outputs a signal voltage of a cycle and a signal voltage of a second polarity that exceeds a threshold level at the maximum advance position of the internal combustion engine, and the signal voltage of the first polarity half cycle. and a signal voltage of a second polarity are used as the first signal and the second signal, respectively, and the ignition signal generating circuit generates the first signal when the first signal becomes equal to or higher than a threshold level. a first integrating circuit that performs an integrating operation of instantaneously charging an integrating capacitor and discharging the first integrating capacitor with a predetermined discharge current until the first signal becomes equal to or higher than the threshold level again; The second integrating capacitor is charged instantaneously at the maximum advance position where the second signal exceeds a threshold level, and then the second integrating capacitor is additionally charged to increase the terminal voltage of the second integrating capacitor. A second integrating circuit performs an integrating operation to increase the voltage at a predetermined slope, and compares the terminal voltage of the first integrating capacitor with the terminal voltage of the second integrating capacitor to determine whether the terminal voltage of the second integrating capacitor is the first integrating capacitor. and a signal output circuit that generates an ignition signal when the voltage reaches the terminal voltage of the integrating capacitor, and the first integrating circuit is conductive for a period when the first signal is at a threshold level or higher. a first switching element; a differentiating circuit that differentiates a rectangular wave signal obtained by turning on and off the first switching element; and a pulse that the differentiating circuit outputs when the first signal becomes equal to or higher than a threshold level. a second switching element that instantaneously becomes conductive when triggered by the switch to apply a DC voltage to the first integrating capacitor; and a discharging circuit that discharges the first integrating capacitor with a predetermined current. An ignition device for an internal combustion engine characterized by: