JPS6390671A - Ignition device for internal combustion engine - Google Patents

Abstract

PURPOSE:To specify an ignition position during low speed running and to enable execution of an angle of lead in a region near a knocking region in a middle high speed region, by a method wherein a function is added to an ignition section signal generating circuit and a first integrating circuit. CONSTITUTION:An ignition section signal generating circuit 3 includes an ignition section signal generating capacitor C0, a charging circuit, charging the capacitor C0 during provision of a first pulse signal, a discharge circuit, discharging the capacitor C0 at a specified time constant from a position where the first signal is extincted, and a reset circuit, momentarily discharging the capacitor C0 when a second pulse signal is provided. A first integrating circuit 4 includes a switch circuit for initial charge, energized when voltages at both ends of each of an integrating capacitor C1 and the capacitor C0 rise, momentarily charging the capacitor C1 to a specified voltage, and disconnecting when a terminal voltage is increased to a specified level, and an additionally charging circuit, additionally charging the capacitor C1 from a position, allowing the switch circuit to be brought into a disconnected state, to a minimum angle of lead position by means of the terminal voltage of the capacitor C0.

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, in an internal combustion engine, it is necessary to advance the ignition position from a medium speed region to a high speed region of the engine. Recently, in order to accurately control the ignition position, electronically controlled ignition devices that calculate the ignition position electronically have come into widespread use.

As an electronically controlled ignition device, a first pulse signal and a second pulse signal are generated at the maximum advance angle position and the minimum advance angle position, respectively, for each internal combustion type.
an ignition interval signal generation circuit that receives these first and second pulse signals and outputs an ignition interval signal that continues from the maximum advance position to the minimum advance position; A first integrating circuit receives the ignition interval signal as input and performs an integral operation from the maximum advance position to the minimum advance position to generate a first integral voltage; a second integrating circuit that generates a second integral voltage that increases at a predetermined slope from the angular position to the next minimum advance position;
an ignition signal output circuit that outputs an ignition signal including information on the ignition position with the position where the integrated voltage is higher than or equal to the ignition position;
An ignition circuit that receives an ignition signal as input and controls the primary current of the ignition coil to suddenly change at the ignition position determined by the ignition signal, thereby generating a high voltage for ignition on the secondary side of the ignition coil. What is done is known.

The ignition characteristics (characteristics of the ignition position relative to the rotational speed) obtained with this type of conventional ignition device are shown by the line a-+e in Fig. 4.
-+d, the ignition position is kept constant in the low-speed region where the rotational speed N is in the range of NO to N1, and the ignition position is linearly advanced in the medium-high speed region where the rotational speed is in the range of N1 to N3. N3
Either the characteristics that characterize the ignition position in the above high-speed region, or the linear advance of the ignition position in the low-medium-high-speed region where the rotation speed is in the range of NO to N3, such as the polygonal line f→d, The characteristics were characterized by the ignition position in the high speed region.

In the figure, Q is a boundary line indicating the boundary between the area where knocking occurs and the area where knocking does not occur, and the shaded area in the figure is the area where knocking occurs. Further, nd indicates an idling region.

[Problems to be solved by the invention] In order to improve the output at medium and high speeds, it is necessary to ignite at a position relatively close to the area where knocking occurs. It is preferable to advance the ignition position along straight line C, which is closer to the knocking region, than to advance the ignition position along straight line e. However, when trying to obtain the characteristic of advancing the engine angle along straight @C in the medium and high speed range of the engine using a conventional ignition system, no.
Even in the low speed range of N1, the ignition position is advanced.

There was a problem that the eye link became unstable.

An object of the present invention is to provide an ignition system for an internal combustion engine that is capable of stabilizing idling by keeping the ignition position constant at low speeds, and that advances the ignition angle in a region relatively close to the knocking region in the medium and high speed ranges. The goal is to provide equipment.

[Means for Solving the Problems] The present invention provides a pulse signal generation circuit that outputs a first pulse signal and a second pulse signal at a maximum advance position and a minimum advance position, respectively, of an internal combustion engine; and an ignition interval signal generation circuit that receives the second pulse signal as input and outputs an ignition interval signal that continues from the maximum advance position to the minimum advance position, and receives the first and second pulse signals as input and outputs an ignition interval signal that continues from the maximum advance position. An ignition interval signal generation circuit that outputs an ignition interval signal that lasts up to the minimum advance position, and an ignition interval signal generating circuit that performs an integral operation from the maximum advance position to the minimum advance position using the ignition interval signal as input;
a first integrating circuit that generates an integrated voltage of , and a second integrating circuit that increases at a predetermined slope from the position immediately after each minimum advance angle position to the next minimum advance angle position under the control of a second pulse signal. A second integral circuit that generates an integral voltage compares the first integral voltage and the second integral voltage, and determines that the position where the first integral voltage is equal to or higher than the second integral voltage is the ignition position. an ignition signal output circuit that outputs an ignition signal including information on the ignition signal; In an ignition system for an internal combustion engine equipped with an ignition circuit that generates a high voltage for ignition on the side, the ignition position is kept constant at low speeds, and advanced in a region relatively close to the knocking region in medium and high speed regions. It was made so that it could be done.

Therefore, in the present invention, the ignition interval signal generation circuit
a capacitor for generating an ignition interval signal; a capacitor charging circuit that charges the capacitor for generating an ignition interval signal while the first pulse signal is applied; and a capacitor charging circuit that charges the capacitor for generating an ignition interval signal while the first pulse signal is applied; It is comprised of a capacitor discharge circuit that discharges at a time constant, and a reset circuit that instantly discharges the capacitor when the second pulse signal is applied.

The first integrating circuit conducts when the voltage across the integrating capacitor and the ignition interval signal generation capacitor rises, instantly charging the integrating capacitor to a constant voltage, and increasing the terminal voltage of the integrating capacitor. There is an initial charging switch circuit that shuts off when a certain level is reached, and an integral capacitor that is activated at a constant time by the terminal voltage of the ignition interval signal generation capacitor from the position where the initial charging switch circuit is cut off to the minimum advance position. It is composed of an additional charging circuit that performs additional charging at a constant rate.

[Operation of the invention] With the above configuration, the ignition interval signal generating capacitor discharges with a constant time constant after the first pulse signal disappears, so the waveform of the ignition interval signal ■q is as shown in FIG. 3C. As shown by the one-dot chain line or the two-dot chain line, the waveform descends at a constant slope from the position at angle θ1-, where the first pulse signal disappears, and returns to zero at the minimum advance angle position θ2. Ignition interval signal V
If the waveform of q is a rectangular waveform as shown by the solid line in Fig. 3C, if the initial charging and additional charging of the integrating capacitor are performed using this ignition interval signal VC+, a voltage is obtained at both ends of the integrating capacitor. The waveform of the first integrated voltage (1) is as shown by the solid line in the third diagram.

The waveform of the second integrated voltage v2 obtained from the integrating circuit of solution 2 is as shown in FIG. 2E.

Comparing the first integrated voltage of the waveform shown by the solid line in the third figure with the second integrated voltage, and assuming that the ignition position is the position where the first integrated voltage is greater than or equal to the second integrated voltage, the ignition characteristics The angle becomes like the straight line f in Fig. 4, and the angle is advanced even at low speeds.

On the other hand, when the integrating capacitor is initially charged and additionally charged by the ignition period signal Vq having the waveform shown by the one-dot chain line or the two-dot chain line in FIG. As shown by the one-dot chain line or the two-dot chain line in the third figure, the waveform of the voltage v1 has a first slope part 11 and a second slope part V12 whose slope is smaller than this first slope part. It has a curved waveform.

In this way, if the first integrated voltage with a curved waveform is obtained and the ignition position is the position where the first integrated voltage 1 is equal to or higher than the second integrated voltage 72, then the second integrated voltage of the first integrated voltage In the rotation range where the ignition position is determined by the slope portion V12 becoming equal to or higher than the second integrated voltage 72, the ignition position advances more rapidly than in the case of the conventional ignition system, as shown in part b of FIG. In the rotation range where the ignition position is determined by the first slope portion V11 of the first integrated voltage becoming equal to or higher than the second integrated voltage 72, the ignition position is different from the case where the conventional ignition device is used, as shown in part C in FIG. Advance at a similar rate.

Therefore, the ignition characteristics are as shown in a-+b-+c-+d in FIG. 4, and the ignition position can be kept constant at low speeds and advanced in a region relatively close to the knocking region at medium and high speeds.

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

[I] Structure of Embodiment FIG. 1 shows an embodiment of the present invention, in which 1 is an ignition circuit, 2 is a pulse signal generation circuit, 3 is an ignition interval signal generation circuit, and 4 and 5 are 6 is a third integrating circuit, and γ is an ignition signal output circuit. Each of these parts will be explained below.

(a) Ignition circuit 1 The ignition circuit 1 includes an ignition coil 101, a transistor 102, and a spark plug 103. The ignition coil 101 has a primary coil 101a and a secondary coil 101b wound around an iron core, both coils 101a and 101b.
One end of the two is connected in common. Transistor 102 is a Darlington-connected composite transistor, and the emitter of transistor 102 is grounded. The collector of the transistor 102 is connected to a common connection point of one end of the primary coil 101a and the secondary coil 101b, and the other end of the primary coil 101a is connected to the positive electrode of a battery (not shown) whose negative electrode is grounded.

The spark plug 103 is attached to a cylinder of an engine (not shown), and the non-ground terminal of the spark plug is connected to the other end of the secondary coil 101b via a high voltage cord.

This ignition circuit is a current cut-off type circuit, and the transistor 10
When an ignition signal is supplied to the base of the transistor 102, the transistor 102 becomes conductive, and the primary coil 1 is connected to the primary coil 1 from a battery (not shown).
A primary current flows between the collector and emitter of the transistor 01a and the transistor 102. When the ignition signal falls to zero at the ignition position and the transistor 102 is cut off, a high voltage is induced in the primary coil 101a, and this voltage is further boosted to induce a high voltage for ignition in the secondary coil 101b. Since this high voltage is applied to the ignition plug 103, a spark is generated in the ignition plug, and the vs spark is ignited. When such a current interruption type ignition circuit is used, the rising position of the ignition signal becomes the current supply start position, and the falling position of the ignition signal becomes the ignition position. In other words, the falling edge of the ignition signal is the part that includes information on the ignition position.

(b) Pulse signal generation circuit 2 The pulse signal generation circuit 2 includes a pulser coil 200 and first and second waveform shaping circuits 201 and 202.

The balsa coil 200 is installed in a signal generator attached to the internal combustion engine, and as shown in the second figure, the balsa coil 200 is set to a threshold value at a first rotation angle position θ1 and a second rotation angle position value θ2 of the internal combustion engine. The first and second signals Vs1 and Vs2, which are higher than the current level yt, are output. In this embodiment, the first rotation angle, position θ1, and second rotation angle position θ2 correspond to the maximum advance angle position and the minimum advance angle position, respectively, of the engine.

The first waveform shaping circuit 201 shapes the waveform of the first signal VSI, rises at the maximum advance angle position θ1, and outputs the signal at a position θ1 immediately after that.
The second waveform shaping circuit 202 outputs a first pulse signal p1 that falls at -, and the second waveform shaping circuit 202 shapes the waveform of the second signal VS2 to produce a second pulse signal that rises at the minimum advance angle position θ2 and falls at position 02' immediately after that. The pulse signal Vp2 is output.

(C) Ignition interval signal generation circuit 3 The ignition interval signal generation circuit 3 includes a PNP transistor Tr1
and an NPNt transistor Tr2, an ignition interval signal generation capacitor CO, and a variable resistor VRI. One end of the capacitor CO is grounded, and the collector of the transistor Tr1 is connected to the non-grounded terminal of the capacitor. The emitter of the transistor Tr1 is connected to the non-grounded output terminal of a DC constant voltage Ti source (not shown), and the first pulse signal Vp1 is applied from the first waveform shaping circuit 201 to the base of the transistor Tr1. A capacitor charging circuit is configured that charges the ignition period signal generating capacitor CO while the first pulse signal is applied by the transistor Trl.

A variable resistor VR1 is connected in parallel to both ends of the capacitor CO, and this variable resistor generates the first pulse signal p1.
A capacitor discharge circuit is configured to discharge the capacitor at a constant time constant from the position where the capacitor disappears.

The collector of a transistor Tr2 whose emitter is grounded is also connected to the non-grounded terminal of the capacitor Co, and a second waveform shaping circuit 202 is connected to the base of the transistor Tr2.
A second pulse signal Vp2 is applied from the second pulse signal Vp2. A reset circuit is configured that instantly discharges the capacitor CO when the second pulse signal VD2 is applied by the transistor Tr2.

When the first pulse signal Vl)1 is generated at the maximum advance angle position θ1, the transistor Tr1 becomes conductive and instantly charges the capacitor CO to the power supply voltage vb. When the first pulse signal Vpl disappears at the angle 01', the transistor Tr
Since l is cut off, charging of capacitor CO is stopped, and from now on capacitor CO is connected through variable resistor VR1.
discharges with a constant time constant. When the second pulse signal is generated at the minimum advance angle position θ2, the transistor Tr2 becomes conductive, so that the charge in the capacitor CO is instantly discharged.

Therefore, the terminal voltage of capacitor CO (ignition interval signal) VQ
As shown in the second diagram and FIG.
The waveform descends at a constant slope from the position θ2 and returns to zero at the minimum advance angle position θ2.

(d) First Integrating Circuit 4 The first integrating circuit 4 includes resistors R1 to R3, a transistor Tr3, and an integrating capacitor C1. The resistors R1 and R2 are connected in series, and the series circuit of both resistors is connected in parallel to both ends of the ignition interval signal generating capacitor CO, and a transistor Tr3 is connected to the connection point of the resistors R1 and R2.
The base is connected. The collector of the transistor Tr3 is connected to the non-grounded terminal of the capacitor CO, and the integrating capacitor C1 is connected between the emitter of the transistor 7'r3 and the ground. In this example, when the voltage across the ignition interval signal generating capacitor Go rises, the transistor Tr3 and the resistors R1 and R2 conduct, and instantly charge the integrating capacitor C1 to a constant voltage, thereby charging the terminals of the integrating capacitor C1. An initial charging switch circuit is configured that shuts off when the voltage reaches a certain level. Additionally, an additional charging circuit is configured to additionally charge the integrating capacitor C1 at a constant time constant from the position where the initial charging switch circuit is cut off by the resistor R3 to the minimum advance position using the terminal voltage of the ignition interval signal generating capacitor CO. has been done.

In this first integration circuit, at the same time as the voltage (ignition interval signal) Vq across the ignition interval signal generating capacitor CO rises, the transistor Tr3 becomes conductive and charges the capacitor C1 to the polarity shown.

When the terminal voltage of capacitor C1 reaches a certain level V10 corresponding to the value obtained by dividing the terminal voltage VQ of capacitor CO by resistors R1 and R2 (terminal voltage of resistor R2),
Transistor Tr3 is cut off, and transistor T
The initial charging of capacitor C1 through r3 is completed.

After the transistor Tr3 is cut off, the integrating capacitor C1 is additionally charged by the terminal voltage of the capacitor GO through the resistor R3 at a constant time constant. This results in integrating capacitor C
The voltage at the terminal 1 increases, and a first integrated voltage 1 is obtained across the integrating capacitor C1. As aforementioned,
Since the ignition interval signal Vq obtained at both ends of the capacitor CO falls at a constant slope from the position of the angle θ1-, the slope of the upper limit of the terminal voltage of the capacitor C1 becomes small from the middle. Therefore, the waveform of the first integrated voltage ■1 rises to a certain level at the maximum advance position θ1, then first reaches the upper limit at the first slope, then rises at the second slope smaller than the first slope, and reaches the minimum. The waveform becomes curved and reaches zero at the advanced angle position θ2. The portion of the first integrated voltage that rises at the first slope is defined as the first slope portion V11, and the portion that rises at the second slope is defined as the second slope portion V11.
It is assumed that the inclined portion V12 is V12. The slope of the second slope portion V12 can be adjusted as appropriate by adjusting the resistance value RX of the variable resistor VR1 to change the slope of the ignition interval signal. That is, by decreasing the resistance value RX of the variable resistor VR1, the slope of the slope portion of the ignition interval signal Vq can be changed as shown by the one-dot chain line and the two-dot chain line in FIG. The waveform of the first integral voltage 1 when the integrating capacitor C1 is additionally charged by the ignition interval signal having the slope portion shown by the dashed line and the dashed double dot line in FIG. and as shown by the two-dot chain line.

(e) Second Integrating Circuit 5 The second integrating circuit 5 includes, for example, an integrating capacitor, a circuit that charges the integrating capacitor from a DC power supply through a resistor or a constant current circuit, and a second pulse signal Vl. )2 is generated, and a reset circuit that discharges the integrating capacitor while 2 is occurring, and as shown in FIG.
A second integrated voltage 2 with a waveform rising at a predetermined slope from ' to the next minimum advance angle position θ2 is output.

(f) Third integrating circuit 6 The third integrating circuit 6 is connected to the transistor 102 of the ignition circuit 1.
This is provided to determine the conduction start position of the ignition circuit 1, and is provided only when the current interrupting type ignition circuit 1 is used.

This third integrating circuit 6 operates, for example, to control the integrating capacitor and the integrating capacitor at a constant time constant from the time when a certain time to has elapsed after the ignition interval signal Vq rises until the time when the ignition interval signal Vq falls. It is composed of a charging circuit that charges the integral capacitor and a reset circuit that discharges the integral capacitor at the minimum advance angle position, and as shown in FIG. 2G, each maximum advance angle position θ
The voltage is maintained at a constant slope from a position delayed by an angle corresponding to a certain time to (varies depending on the number of revolutions) to the minimum advance angle position θ2 from 1 to the maximum advance angle position of rear feed, and the voltage is maintained at the maximum advance angle position. A third integrated voltage V3 having a waveform that returns to zero at θ1 is output.

(a) Ignition signal output circuit 7 The ignition signal output circuit 7 includes a first comparison circuit CM1 that compares the first integral voltage 1 and the second integral voltage v2, and a third
Compare the integrated voltage V3' with the second integrated voltage ■2 0
It consists of M2 and resistor R4. First integral voltage ■1
and the second integrated voltage 2 are respectively input to the negative phase input terminal and the positive phase input terminal of the comparator circuit CM1,
The potential of the non-grounded output terminal of 1 is at a high level (non-grounded level) when the first integrated voltage 1 is less than the second integrated voltage 2, and the first integrated voltage v1 is lower than the second integrated voltage v1. When the voltage becomes 2 or higher, it becomes a low level (ground level). Further, the third integral voltage 3 and the second integral voltage v2 are input to the negative phase input terminal and the positive phase input terminal of the second comparator circuit CM2, respectively, and the potential of the non-ground side output terminal of this comparator circuit CM2 is , when the third integrated voltage V3 is less than the second integrated voltage, it is at a high level, and when the third integrated voltage V3 becomes equal to or higher than the second integrated voltage, it becomes a low level (ground level).

The non-grounded output terminals of the first and second comparison circuits CM1 and CM2 are commonly connected and connected to a DC power supply (not shown) through a resistor R4, and the common connection point of the output terminals of both comparison circuits is a transistor 102 of the ignition circuit. connected to the base of.

In this example, an AND circuit is configured by commonly connecting the non-grounded output terminals of comparison circuits CM1 and 0M2, and when the AND condition of the outputs of both comparison circuits is satisfied, the transistor of ignition circuit 1 (primary current A pace current is caused to flow through the resistor R4 (control switch).

[II] Operation of the embodiment In the embodiment described above, the pulse signal generation circuit 2 outputs the first pulse signal Vp1 and the second pulse signal Vp2 at the maximum advance angle positions θ1 and θ2 of the engine, respectively, and generates the ignition interval signal. The generating circuit 3 converts the maximum advance angle position θ1 to the minimum advance angle position θ.
Outputs an ignition interval signal VQ that lasts up to 2. As shown in Figure 2 and Figure 3C, the waveform of this ignition interval signal VC+ rises to the power supply voltage at the maximum advance angle position θ1, falls at a constant slope from the angle θ1' position, and then falls at the minimum advance angle position. The waveform returns to zero at θ2. Since the integrating capacitor C1 is charged by this ignition period signal, the waveform of the first integrated voltage V1 obtained across the integrating capacitor has a first slope portion V11 and a first slope portion V11 as shown in FIGS. 2E and 3. The waveform has a second slope portion V12 having a smaller slope than the first slope portion.

Further, the second integrating circuit 5 and the third integrating circuit 6 respectively generate a second integrated voltage V2 with waveforms as shown in FIG. 2E and G, and a third integrated voltage V3 as shown in FIG. 2G. Output.

As shown in FIG. 2G, when the third integrated voltage 3 becomes equal to or higher than the second integrated voltage 2 at the angle θ0, the comparator circuit C
The potential of the output terminal of M2 becomes high level. At this time, the first integrated voltage ■1 is lower than the second integrated voltage V2, and the potential of the output terminal of the comparator circuit CM1 is at a high level.
When the potential of the output terminal of the comparator circuit CM2 becomes high level at the position of the angle θ0, a resistor R is connected to the output terminal of the ignition signal output circuit 7.
The ignition signal V1 is outputted through 4. This causes a base current to flow through the transistor 102, making the transistor conductive. Therefore, the primary coil 1 is connected to the battery (not shown).
A primary current flows between the collector and emitter of the transistor 01a and the transistor 102.

Next, when the first integrated voltage v1 exceeds the second integrated voltage 72, the potential of the output terminal of the comparison circuit CM1 becomes the ground level, so the ignition signal i falls and the transistor 102 is cut off. As a result, the primary current is cut off, a high voltage for ignition is induced in the secondary coil 101b of the ignition coil, and an ignition operation is performed.

In the low speed ft range where the engine speed is less than N1, the second
As shown in Figure E, the second integrated voltage V2 exceeds the first integrated voltage up to the minimum advance position θ2, so when the second integrated voltage falls at the minimum advance position The first integrated voltage V1 becomes equal to or higher than the second integrated voltage 72 for the first time, and the ignition operation is performed at this minimum advance angle position.

When the engine rotation speed exceeds the advance start rotation speed N1, the first integrated voltage ■1's second
The ignition operation is performed at a position where the slope portion V12 of the first integral voltage becomes equal to or higher than the second integral voltage 2, and the second slope portion of the first integral voltage becomes equal to or higher than the integral voltage M2. Since the peak value of the second integral voltage decreases as the rotation speed increases, the position where the second slope portion is equal to or higher than the second integral voltage ■2 is advanced as the rotation speed increases. go. When the rotational speed exceeds the advance angle switching rotational speed N2 (>Nl), the first slope portion V11 of the first integral voltage V1 becomes equal to or higher than the second integral voltage, and this first slope part is second
Ignition operation is performed at a position where the integrated voltage is greater than or equal to . When the rotation speed exceeds the advance end rotation speed N3 (>N2), the first integral voltage 1 rises at the minimum advance position and simultaneously exceeds the second integral voltage, and at this maximum advance position The ignition operation is performed.

In the device of the present invention, since the slope of the second slope portion V12 of the first integral voltage 1 is small, the rotation speed is within the region where the ignition position is determined by this second slope portion and the second integral voltage. In the range N1 to N2), the ignition position is significantly advanced with a slight increase in the rotational speed, and the graph of the ignition characteristics (characteristics showing changes in the ignition position with respect to the rotational speed) in this region is as shown in the fourth graph. As shown in the figure, it is a straight line with a steep slope.

Next, the first slope portion V11 of the first integral voltage 1 and the second slope portion V11 of the first integral voltage
In the region where the ignition position is determined by the integrated voltage v2 (the region where the number of rotations is N2 to N3), the slope of the first slope portion V11 is large, so the slope of the graph showing the ignition characteristics is determined by the above-mentioned N1
It becomes smaller than the area of ~N2.

Therefore, the ignition characteristics obtained by the device of the present invention are as shown in a−+b−+C−+d in FIG. Advance the angle rapidly to bring it closer to the knocking area,
In medium and high speed ranges, the angle can be advanced near the knocking range. Therefore, it is possible to improve the output of the engine in the medium and high speed range.

The slope of the advance angle characteristic (advance angle ratio) in the boundary area between the low speed region and the medium speed region is determined by changing the resistance value of the variable resistor VR1 to change the slope of the second slope portion V12 of the first integrated voltage. It can be adjusted as appropriate.

In this embodiment, a third integral circuit 6 is provided, and the position where the primary current of the ignition coil starts to flow is determined by comparing the third integral voltage obtained from this integral circuit with the second integral voltage. There is. The peak value of the second integrated voltage V2 decreases as the engine speed increases. Since the time to from when Vq rises at the maximum value advance position until charging of the integrating capacitor of the third integrating circuit starts is constant, the charging time of the integrating capacitor changes as the rotation speed increases. It's getting shorter. Therefore, the drop in the third integrated voltage obtained from the third integrating circuit is larger than the drop in the second integrated voltage obtained from the second integrating circuit whose integrating capacitor has a longer charging period. Therefore, the position where the second integrated voltage becomes equal to or higher than the third integrated voltage (the rising position of the ignition signal (1)) advances as the engine speed increases. By controlling the rise position of the ignition signal in this way, the time during which the primary current flows through the ignition coil can be controlled to be almost constant.
It is possible to prevent the primary current from flowing for a long time when the engine is running at low speeds (which would cause excessive heat generation in the ignition coil 101 and the transistor 102), and also to shorten the conduction period of the primary current when the engine is running at high speeds. This can prevent the ignition performance from deteriorating.

In the present invention, it is not necessary to perform such I11 control of the conduction time of the primary current, and the third integrating circuit 6 and comparison circuit CM2 can be omitted. If the third integration circuit 6 and comparison circuit CM2 are omitted, the ignition signal V1 will always rise from the position 02' where the second pulse signal Vp2 disappears.

[Other Embodiments] In the above embodiments, a current cutoff type ignition circuit was used, but the present invention can be similarly applied to a case where a capacitor discharge type ignition circuit is used.

FIG. 5 shows an embodiment in which a capacitor discharge type ignition circuit 1 is used. An ignition coil 101, a spark plug 103, an exciter coil 110 provided in a magnet generator driven by an internal combustion engine and with Q grounded, a capacitor 111, and a diode 1.
12, a thyristor 113, and a diode 114. One end of the primary coil 101a and the secondary coil 101b of the ignition coil is grounded, and the primary coil 1
One end of a capacitor 111 is connected to the non-grounded terminal of the capacitor 01a. The other end of the capacitor 111 is connected to the cathode of a diode 112 whose anode is connected to the non-ground terminal of the exciter coil 110, and a thyristor 113 is connected between the connection point of the diode 112 and the capacitor 111 and the ground.
is connected. The diode 114 is connected to the primary coil 10
It is connected to both ends of 1a with its cathode facing the ground side.

In this ignition circuit, when exciter coil 110 induces a half-cycle voltage of one polarity, capacitor 111 is charged from the exciter coil through diode 112, primary coil 101a, and diode 114. Next, when a trigger signal is applied to the thyristor 113, the thyristor 113 becomes conductive and the capacitor 111
The electric charge is discharged to the primary coil 101a. As a result, the primary current of the ignition coil suddenly changes, so the secondary coil 101
A high voltage is induced at b, and an ignition operation is performed.

In a capacitor discharge type ignition circuit, there is no need to control the position at which the primary current of the ignition coil starts flowing.
The third integration circuit is omitted, and the comparison circuit CM2 is omitted. Furthermore, in this case the thyristor 11 is activated at the ignition position.
4, a signal that rises to a high level at the ignition position is required as the ignition signal Vi. Therefore, in this example, the first integrated voltage v1 is input to the positive phase input terminal of the comparison circuit CM1, and the second integrated voltage v2 is input to the negative phase input terminal of the comparison circuit CM1. Other points are similar to the embodiment shown in FIG.

In the embodiment shown in FIG. 5, when the first integrated voltage 1 becomes equal to or higher than the second integrated voltage 2, the potential at the output terminal of the comparator circuit CM1 becomes high level, and a trigger signal is sent to the thyristor 113. Given.

Therefore, the rising edge of the ignition signal (i) becomes the part that includes information on the ignition position.

In each of the above embodiments, a variable resistor VR1 is connected to both ends of the ignition interval signal generating capacitor CO, but if there is no need to adjust the discharge time constant of the capacitor CO, this variable resistor can be used instead. Of course, a fixed resistor may also be used.

It is also possible to replace the resistor R3 of the first integrating circuit with a variable resistor so that the charging time constant when additionally charging the integrating capacitor C1 can be adjusted as appropriate.

[Effects of the Invention] As described above, according to the present invention, the ignition position is kept constant in the low speed range, the ignition position is rapidly advanced in the transition range from the low speed range to the medium to high speed range, and knocking is prevented in the medium to high speed range. Since the engine can be advanced in a relatively close range, it has the advantage of stabilizing idling and improving the output of the engine in medium and high speed ranges.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram showing an embodiment of the present invention, Fig. 2 is a signal waveform diagram of each part of Fig. 1, and Fig. 3 is a diagram of the first and second pulse signals and ignition intervals in the embodiment of Fig. 1. FIG. 4 is a waveform diagram showing an enlarged waveform of the signal and the first integrated voltage; FIG. 4 is a diagram showing the ignition characteristics obtained by the present invention together with the ignition characteristics obtained by a conventional ignition device; FIG. FIG. 3 is a circuit diagram showing another embodiment of the present invention. 1... Ignition circuit, 2... Pulse signal generation circuit, 3.
...Ignition interval signal generation circuit, Trl, Tr2...Transistor, CO...Ignition interval Shintan generation capacitor,
VRl...variable resistor, 4...first integration circuit, R
1-R3...Resistor, Tr3...Transistor, C1
... Integrating capacitor, 5... Second integrating circuit, 6.
...Third integration circuit, 7...Ignition signal output circuit. Procedural amendment (voluntary) 1. Indication of the case: Japanese Patent Application No. 61-237754 2, Name of the invention: Ignition device for internal combustion engines 3, Person making the amendment Relationship to the case: Patent applicant (134) Kokusan Dentan Co., Ltd. 4, Agent: Shinbashi, Minato-ku, Tokyo 4-31-6 Expenditure Building 6th Floor 5, "Claims" and "Details of the Invention" in the specification to be amended (1) The claims are corrected as shown in the attached sheet. (2) Page 6, No. 15 Delete "first and . . . generating circuits," from line to 18th line. (3) Correct "second no" in line 10 of page 11 to "second". (4) Change “Position value θ2” on page 13, line 15 to 1 position θ2
” is corrected. (5) Insert " ] before "output," in the 5th line of page 14. (6) Correct "voltage 1" to "voltage V1 j" in the 9th line of page 19. (7 ) Insert "second comparison circuit" after "compare" on page 21, line 5. Above 2, Claims A pulse signal generation circuit 37 that outputs a first pulse signal and a second pulse signal at the maximum advance angle position and the minimum advance angle position, respectively, of the internal combustion engine, Lμ first and second pulses. 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; and an ignition interval signal generation circuit that receives the ignition interval signal as input and performs an integral operation from the maximum advance position to the minimum advance position. a first integrating circuit that generates a first integrated voltage by performing the following steps; and a first integrating circuit that generates a first integrated voltage; and a second integrating circuit that generates a second integrated voltage that increases at an ignition signal output circuit that outputs an ignition signal that outputs information on the ignition position with the position as the ignition position; and an ignition signal output circuit that receives the ignition signal and suddenly changes the primary current of the ignition coil at the ignition position determined by the ignition signal. In an ignition device for an internal combustion engine, the ignition circuit includes an ignition circuit that generates a high voltage for ignition on the secondary side of the ignition coil by controlling the ignition interval, and the ignition interval signal generation circuit includes an ignition interval signal generation capacitor; Said first
a capacitor charging circuit that charges the ignition interval signal generation capacitor while the pulse signal of
a capacitor discharging circuit that discharges the capacitor at a constant time constant from a position where the second pulse signal disappears; and a reset circuit that instantly discharges the capacitor when the second pulse signal is applied; The integrating circuit of
When the voltage across the integrating capacitor and the ignition interval signal generation capacitor rises, conduction occurs and the integrating capacitor is instantly charged to a certain voltage, and when the terminal voltage of the integrating capacitor reaches a certain level. The integrating capacitor is added at a constant time constant according to the initial charging switch circuit to be cut off and the terminal voltage of the ignition interval signal generating capacitor from the position where the initial charging switch circuit is cut off to the minimum advance angle position. An ignition device for an internal combustion engine, comprising an additional charging circuit for charging.

Claims (1)

[Scope of Claims] A pulse signal generation circuit that outputs a first pulse signal and a second pulse signal at a maximum advance position and a minimum advance position of an internal combustion engine, respectively; an ignition interval signal generation circuit that outputs an ignition interval signal that lasts from the maximum advance position to the minimum advance position as input; and an ignition interval signal generation circuit that receives the first and second pulse signals as input and continues from the maximum advance position to the minimum advance position. an ignition interval signal generation circuit that outputs an ignition interval signal that outputs an ignition interval signal; and a first integral that performs an integral operation from a maximum advance angle position to a minimum advance angle position using the ignition interval signal as input to generate a first integral voltage. a second integral voltage controlled by the second pulse signal to generate a second integral voltage that increases at a predetermined slope from a position immediately after each minimum advance position to the next minimum advance position; a circuit; comparing the first integrated voltage and the second integrated voltage, and setting a position where the first integrated voltage is equal to or higher than a second integrated voltage as an ignition position; and an ignition signal including information on the ignition position. An ignition signal output circuit that outputs an ignition signal, and an ignition high voltage on the secondary side of the ignition coil by controlling the ignition signal to suddenly change the primary current of the ignition coil at the ignition position determined by the ignition signal. An ignition device for an internal combustion engine comprising an ignition circuit that generates a voltage, wherein the ignition interval signal generation circuit includes an ignition interval signal generation capacitor and a capacitor that generates the ignition interval signal while the first pulse signal is applied. a capacitor charging circuit that charges a capacitor for the purpose of operation; a capacitor discharging circuit that discharges the capacitor at a constant time constant from a position where the first pulse signal disappears; and a reset circuit for instantaneously discharging, and the first integrating circuit conducts when the voltage across the integrating capacitor and the ignition interval signal generating capacitor rises to instantly discharge the integrating capacitor to a certain level. an initial charging switch circuit that charges up to a voltage and shuts off when the terminal voltage of the integrating capacitor reaches a certain level; and the ignition section from the position where the initial charging switch circuit is cut off to the minimum advance position. An ignition device for an internal combustion engine, comprising an additional charging circuit that additionally charges the integrating capacitor at a fixed time constant using a terminal voltage of a signal generating capacitor.