JPS63131868A - Ignitor for internal combustion engine - Google Patents

Abstract

PURPOSE:To compensate for the lag of an ignition position during the high speed rotation of an engine to prevent the output lowering of the engine by forming the waveform of the primary integral voltage in a crooked waveform having the primary, the secondary and the third inclining part which are slower in their slope in order. CONSTITUTION:The waveform of the integral voltage of an integrating capacitor C1 the primary integrating circuit 4 is formed in a crooked waveform having the primary, the secondary and the third inclining part which are slower in their slope in order. Thus the operation of spark advance having characterietics in which an ignition position advances quickly from the set number of revolutions and then advances slowly can be executed. Consequently, compensation for the lag of the ignition position due to the lag factor of the circuit during the high speed rotation of an engine, the constancy of the ignition position in a high speed range, and the advance of the ignition position in the high speed range become realizable, and the output lowering of the engine due to the lag of the ignition position during its high speed range can be therefore prevented.

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 electronically determine the ignition position have come into widespread use.

As an electronically controlled ignition device, a pulse signal generation circuit outputs a first pulse signal and a second pulse signal at a first rotational angular position and a second rotational angular position, respectively, of the internal combustion engine; an ignition interval signal generation circuit that receives a second pulse signal as an input and outputs an ignition interval signal that lasts from a first rotational angular position to a second rotational angular position; from the second
a first integrating circuit that performs an integral operation to generate a first integral voltage up to a rotational angular position; a second integrating circuit that generates a second integral voltage that increases at a predetermined slope up to the angular position; and information about the ignition position, with the position where the first integral voltage becomes equal to or higher than the second integral voltage as the ignition position. an ignition signal output circuit that outputs an ignition signal including the ignition signal; It is known to be constructed with an ignition circuit that generates a high voltage for ignition.

[Problems to be Solved by the Invention] As described above, in a signal generation circuit configured to calculate the ignition position by integral calculation, many capacitors and resistors are used as delay elements, so these delay elements As a result, the ignition position tends to be delayed when the engine is running at high speeds, resulting in a problem in that the output of the I engine decreases at high speeds.

SUMMARY OF THE INVENTION An object of the present invention is to provide an ignition system for an internal combustion engine that prevents ignition position delay at high speeds.

[Means for Solving the Problems] The present invention provides a pulse signal generator that outputs a first pulse signal and a second pulse signal at a first rotation angle position and a second rotation angle position of an internal combustion tR leap, respectively. a circuit, an ignition interval signal generation circuit receiving the first and second pulse signals and outputting an ignition interval signal lasting from the first rotational angular position to the second Ii′1@angular position; an ignition interval signal generation circuit that receives a pulse signal of 2 as input and outputs an ignition interval signal that lasts from a first rotational angular position to a second rotational angular position; a first integrating circuit that performs an integral operation up to a second rotational angular position and generates a first integrated voltage; a second integrating circuit that generates a second integrated voltage that increases at a predetermined slope until the next second rotation angle position; an ignition signal output circuit that outputs an ignition signal including information on the ignition position by setting the position where the integrated voltage is equal to or higher than a second integrated voltage as the ignition position; In an ignition system 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 primary current of the coil to suddenly change. This prevents delays.

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, charges the integrating capacitor with a first time constant, and the terminal voltage of the integrating capacitor increases. There is an initial charging switch circuit that shuts off when a certain level is reached, and an integrating capacitor that is activated 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 second rotational angle position. and an additional charging circuit that performs additional charging with a second time constant that is larger than the first time constant.

The present applicant previously filed Japanese Patent Application No. 61-237754. The invention of the earlier application stabilizes idling by keeping the ignition position constant at low speeds of the engine, and improves output by obtaining a characteristic of advancing the engine in a region relatively close to the knocking region in medium and high speed regions. Although the object is different from the present invention, the structure is similar to the present invention.

The difference in structure between the ignition device for an internal combustion engine of the present invention and the ignition device proposed earlier is that in the earlier application, when the ignition interval signal rises, the initial charging switch circuit of the first integrating circuit charges the integrating capacitor. While charging to a constant voltage instantly,
In the present invention, the initial charging switch circuit charges the integrating capacitor with a predetermined time constant, and the present invention achieves a different object from the previous application due to the difference in the initial charging method.

[Operation of the invention] In the conventional ignition device having the above configuration, the capacitor discharging circuit is removed from the ignition interval signal generation circuit, and the initial charging switch circuit of the first integrating circuit instantly charges the first integrating capacitor to a constant voltage. This corresponds to the initial charging.

In the conventional ignition device of this type, the waveform of the ignition interval signal VQ obtained at both ends of the ignition interval signal generation capacitor rises at the first rotation angle position θ1 as shown in a of FIG.
It becomes a rectangular wave that becomes zero at the second rotation angle position θ2, and when the rectangular wave-like ignition interval signal Vq is used to perform initial charging and additional charging of the integrating capacitor of the first integrating circuit, a gain is generated at both ends of the integrating capacitor. The waveform of the first integrated voltage ■1, as shown in a in the third diagram, instantaneously rises to a constant voltage at the first rotation angle position θ1, and then rises at a constant slope until the second rotation angle position θ2. The waveform will be as follows.

- The waveform of the second integrated voltage v2 obtained from the integrating circuit of the force cylinder 2 is as shown in FIG. 2E. Compare the first integrated voltage ■1 with the waveform shown by the solid line in the third diagram with the second integrated voltage V2, and let the ignition position be the position where the first integrated voltage is equal to or higher than the second integrated voltage. , the ignition position at high speeds tends to be delayed due to the time constant of the integration circuit, and the ignition characteristics are
As shown by line a in the figure, the engine has a characteristic of retarding when the engine is running at high speed.

On the other hand, when configured as in the present invention, the ignition interval signal generation capacitor discharges at a constant time constant after the first pulse signal disappears, so the waveform of the ignition interval signal Vq is 1 as shown in FIG. 3C. As indicated by b or C indicated by a dashed dotted line or a dashed double dotted line, the first pulse signal descends at a constant slope from the position at the angle θ1° where it disappears to the second rotational angular position (minimum advance angle position) θ2. The waveform returns to zero. When the initial charging switch circuit of the first integrating circuit is provided with a time constant and initial charging and additional charging of the integrating capacitor of the first integrating circuit is performed using the above-mentioned ignition interval signal Vq, the integrating capacitor is first charged. It is charged at a constant time constant through an initial charging switch circuit, and the terminal voltage of the integrating capacitor increases at a first slope from the position of angle θ1. When the terminal voltage of the integrating capacitor reaches a certain level ■0 at the angle θa, the initial charging switch circuit is cut off and charging by the switch circuit ends, and then the integrating capacitor is charged through the additional charging circuit by the ignition interval signal. Ru. Due to this additional charging, the terminal voltage of the integrating capacitor increases with a second slope that is smaller than the first slope, but the ignition interval signal decreases with a constant slope as shown in Figure 3, so this addition During charging (position of angle θb in Fig. 3), the slope of the upper slope of the terminal voltage of the integrating capacitor switches to a third slope that is even smaller than the second slope. 1 integrated voltage ■The waveform of 1 has a first slope portion V11 and a second slope whose slope is smaller than this first slope portion V11, as shown by the one-dot chain line or the two-dot chain line in the third diagram. The waveform becomes a curved waveform having a portion V12 and a third slope portion V13 having an even smaller slope than the second slope portion V12.

In this way, if the first integrated voltage (V1) with a curved waveform is obtained and the ignition position is defined as the position where the first integrated voltage (V1) is equal to or higher than the second integrated voltage ((2), then the first integrated voltage In the rotation region where the third slope portion V13 becomes equal to or higher than the second integral voltage ■2 and the ignition position is determined, the ignition position rapidly advances as shown in part b in Fig. 4, and the first integral voltage In the rotation range where the second slope portion V12 becomes equal to or higher than the second integrated voltage (2) and the ignition position is determined, the ignition position is gradually advanced. As the ignition position advances as the rotation speed increases, the second
The integrated voltage intersects the first slope portion V11 of the first integrated voltage at the angle θa in FIG. The first slope portion V11 of the first integral voltage is equal to the second integral voltage V11.
As in 2, it starts from zero, but when comparing two integrated voltages with the same starting point level (each integrated voltage decreases as the rotation speed increases), the peak integrated voltage is The matching angle is always constant (the position of angle θa).

Therefore, when the second integrated voltage v2 intersects the first slope portion V11 of the first integrated voltage at the position of the angle θa, the advance angle stops. Therefore, in this case, the second integrated voltage of the first integrated voltage is
By adjusting the slope of the slope portion V12, the second integral voltage ■
By appropriately adjusting the advance angle characteristic determined by 2 and the second slope portion V12 of the first integral voltage, the delay in the ignition position at high speeds is compensated for and the ignition is activated at high speeds as shown in Figure 4. It is possible to obtain an advance angle characteristic in which the position is constant, or to obtain a characteristic in which the angle is slightly advanced at high speeds as shown in C in the figure.

Note that when using the first integrated voltage as shown in Figure 3, the advance angle width is from angle θ2 to θ1, but as in the present invention, the advance angle range is from the angle θ2 to θ1. When an integral voltage of 1 is used, the advance angle width is from angle θ2 to θa, and in this case, the maximum advance position θa is the first integral voltage of the first integral voltage.
It can be set appropriately by adjusting the inclination of the inclined portion (11). Therefore, by appropriately configuring the signal generator and setting the angular width between angles θ2 and θ1 wider than the normally required advance angle width, the first slope portion of the first integral voltage By adjusting the slope, lead angle characteristics having various lead angle widths can be obtained with one type of signal generator.

[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 7 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 four poles are grounded.

The spark plug 103 is attached to a cylinder (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 engine 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 balsa coil 200 and first and second waveform shaping circuits 201 and 202.

The pulsar coil 200 is installed in a signal generator attached to an internal combustion engine, and as shown in FIG. It outputs the first and second signals vS1 and VS2 that are equal to or more than 1. In this embodiment, the first rotation angle position θ1 is further advanced than the maximum advance position, and the second rotation angle position θ2 correspond to the minimum advance angle position of the engine.

The first waveform shaping circuit 201 shapes the waveform of the first signal VS1 to produce a first pulse signal V that rises at the first rotation angle position θ1 and falls at the position θ1' immediately thereafter.
p1, and the second waveform shaping circuit 202 waveform-shapes the second signal VS2 to obtain the second rotational angular position θ.
A second pulse signal Vp2 is output, which rises at a position θ2' and falls immediately after that at a position θ2'.

(C) Ignition interval signal generation circuit 3 The ignition interval signal generation circuit 3 includes a PNP transistor Tr1
and an NPN transistor Tr2, an ignition interval signal generation capacitor CO, and a variable resistor VR1.

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 power supply (not shown), and the base of the transistor Tr1 is connected to the first waveform shaping circuit 201.
A capacitor charging circuit is configured to charge the ignition period signal generating capacitor CO while the first pulse signal is provided by the transistor Tr1.

A variable resistor VRI is connected in parallel to both ends of the capacitor CO, and this variable resistor generates a first pulse signal Vpl.
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 20 is connected to the base of the transistor Tr2.
2, a second pulse signal Vp2 is applied. A reset circuit is configured that instantly discharges the capacitor CO when the second pulse signal Vp2 is applied by the transistor Tr2.

When the first pulse signal ■p1 is generated at the first rotation angle position θ1, the transistor Tr1 becomes conductive and the capacitor CO
Instantly charges to the power supply voltage vb.

When the first pulse signal VF)1 disappears at the position of angle 01', the transistor Tr1 is cut off, so charging of the capacitor CO is stopped, and from then on, the variable resistor VRI
The charge on the capacitor CO is discharged with a constant time constant. When the second pulsing q occurs at the second rotation angle position (minimum advance angle position) θ2, the transistor Tr2 becomes conductive, so that the charge in the capacitor CO is instantaneously discharged through the transistor. Therefore, the waveform of the terminal voltage (ignition interval signal) VQ of the capacitor CO is as shown by a solid line in the second diagram and a chain line in FIG.
After rising to the power supply voltage vb, the waveform descends at a constant slope from the position of the angle θ' and returns to zero at the second rotation angle position θ2.

(d) First integrating circuit 4 The first integrating circuit 4 includes resistors R1 to R3, a transistor Tr3, a variable resistor VR2, and an integrating capacitor C1.
It consists of Resistors R1 and R2 are connected in series, and the series circuit of both resistors serves as a capacitor C for generating an ignition interval signal.
The transistor Tr3 is connected in parallel to both ends of the transistor Tr3, and the base of the transistor Tr3 is connected to the connection point between the resistors R1 and R2. The collector of the transistor Tr3 is connected to the non-ground terminal of the capacitor CO via the variable resistor VR2, and the integrating capacitor C1 is connected between the emitter of the transistor Tr3 and the ground.
is connected. In this example, the transistor 7r3, the resistors R1 and R2, and the variable resistor VR2 conduct when the voltage across the ignition interval signal generating capacitor Co rises, and the integrating capacitor C1 maintains a constant voltage at a predetermined time constant. An initial charging switch circuit is configured that charges the integrating capacitor until the terminal voltage reaches a certain level and shuts off the charge. An additional charging circuit additionally charges 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 second rotational angle position using the terminal voltage of the ignition interval signal generating capacitor CO. is configured.

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 the capacitor C passes through the variable resistor VR2 and the transistor Tr3.
1 is charged to the polarity shown in the figure at a predetermined time constant. As a result, the voltage across the capacitor C1 (first integrated voltage) increases at the first slope. When the terminal voltage of the capacitor C1 reaches a certain level VO corresponding to the value obtained by dividing the terminal voltage Vq of the capacitor CO by the resistors R1 and R2 (terminal voltage of the resistor R2), the transistor Tr3 is cut off, and the transistor Tr3 is turned off. The initial charging of capacitor C1 through is completed. After the transistor Tr3 is cut off, the voltage at the terminal of the capacitor CO is applied to the integrating capacitor C through the resistor R3.
1 is additionally charged at a fixed time constant. As a result, the terminal voltage of the integrating capacitor C1 increases, and a first integrated voltage 1 is obtained across the integrating capacitor C1.

As described above, since the ignition interval signal q obtained at both ends of the capacitor CO falls at a constant slope from the position of the angle 01', 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 with a first slope at the first rotation angle position θ1, then rises with a second slope, and then rises with a third slope smaller than the second slope. and rises to the second rotation angle position θ
At 2, the waveform becomes curved and returns to zero. The portion of the first integral voltage that is upper bounded by the first slope is referred to as a first sloped portion V11, and the portions that are upperbounded by the second slope and the third slope are referred to as a second sloped portion V12 and a third sloped portion, respectively. The inclined portion V13 is defined as V13. The slopes of the second and third slope portions V12 and V13 can be adjusted as appropriate by adjusting the resistance value RX of the variable resistor VR1 and changing the slope of the ignition interval signal. That is, as the resistance value Rx of the variable resistor VR1 is decreased, the slope of the slope portion of the ignition interval signal VQ becomes the third slope.
The integral capacitor C1 can be changed as shown by the dash-dotted line and the dash-double line in FIG. The waveforms of the first integrated voltage (1) when the battery is additionally charged are as shown by b and C shown by the one-dot chain line and the two-dot chain line in the third diagram, respectively.

(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 VE. ) 2, and a reset circuit that discharges the integrating capacitor while 2 is occurring, and as shown in FIG. A second integrated voltage V2 having a waveform that rises at a predetermined slope up to the second rotational angular position θ2 is output.

(f) Third integrating circuit 6 The third integrating circuit 6 is the transistor 10 of the ignition circuit 1
This is provided to determine the conduction start position of the ignition circuit 2, 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 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. As shown in FIG. 2G, the 8th first
From the rotation angle position θ1, the angle (
The voltage is maintained at a constant slope from the delayed position (which varies depending on the number of rotations) to the second rotational angle position θ2 until the first rotational angle position of post-washing, and becomes zero at the first rotational angle position θ1. Outputs the third integrated voltage (3) of the returning waveform.

(g) Point large signal output circuit 7 The ignition signal output circuit 7 includes a first comparison circuit CMI that compares the first integrated voltage V1 and the second integrated voltage v2, and a third
The second integral voltage v2 is compared with the second integral voltage v2.
It consists of a comparison circuit CM2 and a resistor R4. The first integrated voltage ■1 and the second integrated voltage ■2 are inputted to the negative phase input terminal and the positive phase input terminal of the comparator circuit CM1, respectively,
The potential of the non-grounded output terminal of the comparator circuit CM1 is at a high level (
It becomes a low level (ground level) when the first integrated voltage V1 becomes equal to or higher than the second integrated voltage V2. Further, the third integral voltage ■3 and the second integral voltage ■2 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 at a high level when the third integrated voltage V3 is less than the second integrated voltage, and is at a low level (ground level) when the third integrated voltage V3 becomes equal to or higher than the second integrated voltage.
become.

The non-ground side output terminals of the first and second comparison circuits CMI and 0M2 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 connected to the transistor 102 of the ignition circuit. connected to the base.

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 Control switch) 10
A base current is caused to flow through the resistor R4 through the resistor R4.

[II] Operation of the embodiment In the embodiment described above, the pulse signal generation circuit 2 outputs the first pulse signal Vpl and the second pulse signal Vp2 at the first rotational angular positions θ1 and θ2 of the engine, respectively, and starts the ignition. The interval signal generation circuit 3 outputs an ignition interval signal Vq that lasts from the first rotational angular position θ1 to the second rotational angular position θ2. The waveform of this ignition interval signal Vq is shown by a solid line in the second figure, and as shown by a chain line in FIG. The waveform descends at an inclination of , and returns to zero at the second rotation angle position θ2. The waveform of the first integrated voltage V1 obtained across the integrating capacitor charged by this ignition interval signal is formed by the first slope portion V11 and the first slope portion as shown in FIGS. 2E and 3. The waveform has a second slope portion V12 having a smaller slope and a third slope portion V13 having a smaller slope than the second slope portion V12.

Further, the second integrating circuit 5 and the third integrating circuit 6 respectively generate a second integrated voltage (2) having waveforms as shown in FIGS. 2E and G, and a third integrated voltage (2) as shown in FIG. 2G. Outputs 3.

As shown in FIG. 2G, when the third integrated voltage 3 becomes equal to or higher than the second integrated voltage V2 at the angle θO, 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 Vi is output 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 V2, the potential of the output terminal of the comparator circuit CM1 becomes the ground level, so the ignition signal Vi 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 a low speed region where the engine speed is less than N1, the second integral voltage v2 exceeds the first integral voltage up to the second rotational angular position θ2, as shown in FIG. 2E. Therefore, the second rotation angle position (minimum advance angle position)
The first integrated voltage ■1 begins when the integrated voltage falls.
becomes equal to or higher than the second integrated voltage (2), and the ignition operation is performed at this second rotational angular position.

When the rotational speed between the two rotations exceeds the advance angle start rotational speed N1, the first integral voltage v1 is increased at a position where the phase is advanced from the second rotational angle position.
The third slope portion V13 becomes equal to or higher than the second integral voltage V2, and the ignition operation is performed at a position where the third slope portion V13 becomes equal to or higher than the second integral voltage V2. The peak value of the second integral voltage decreases as the rotation speed increases, and the third slope portion V13 starts from a level higher than the second integral voltage ■2, and as the rotation speed increases Since the rate of decrease in level is smaller than the second integral voltage, the position where the third slope portion V13 is equal to or higher than the second integral voltage V2 advances as the rotational speed increases.

When the rotation speed is advanced, the switching rotation speed N2 (>N1)
, the second slope portion V1 of the first integrated voltage V1
2 becomes equal to or higher than the second integral voltage, and the ignition operation is performed at a position where this first slope portion becomes equal to or higher than the second integral voltage. The number of revolutions is the advance end revolution number N3 (>
N2), the first slope portion ■11 of the first integral voltage ■1 comes to match the second integral voltage at the angle θa, and the ignition operation is performed at the position of this angle θa. Become.

Since the first slope portion V11 of the first integrated voltage and the second integrated voltage V2 both start from the zero level, the angle θa where both voltages match is always constant, and the position of the angle θa is the maximum. This is the advanced angle position. In reality, due to delay elements in the circuit, the ignition position at high speed tends to lag behind the programmed ignition position, so the maximum advance position is slightly behind the angle θa.

In the device of the present invention, since the slope of the third slope portion V13 of the first integral voltage (1) is small, the region (
In the range of rotation speeds from N1 to N2), the ignition position is significantly advanced at a slight upper limit of the rotation speed, and the graph of the ignition characteristics (characteristics showing changes in ignition position with respect to rotation speed) in this region is as follows. As shown in Figure 4, it becomes a straight line with a steep slope.

Next, the second slope portion V12 of the first integrated voltage
In the region where the ignition position is determined by the integrated voltage V2 (the region where the number of revolutions is N2 to N3), the slope of the first slope portion v11 is large, so the amount of advance angle in this region is small. Therefore, if the advance angle ω in the high speed region of N2 to N3 is set to an extent that compensates for the delay in the ignition position due to the delay element of the circuit, the ignition position will be almost constant in the high speed region as shown in b in Fig. 4. In addition, if the advance angle m in the high-speed region of N2 to N3 is made larger than the amount of approach of the ignition position due to the delay element of the circuit, the characteristics can be obtained in the high-speed region as shown in C in Fig. 4. It is also possible to obtain a characteristic of slightly advancing the angle.

The slope of the advance angle characteristic (advance angle ratio) can be adjusted as appropriate by changing the resistance value of the variable resistor VR1 and changing the slopes of the second and third slope portions V13 and V12 of the first integrated voltage. I can do it. Also, the maximum advance angle position is set by variable resistor VR.
2 to obtain the first slope portion V11 of the first integrated voltage V1.
It can be adjusted as appropriate by changing the slope of .

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 first rotational angle position until charging of the integrating capacitor of the integrating circuit of the rear cylinder 3 starts is constant, the charging time of the integrating capacitor reaches the upper limit of the rotation speed. It becomes shorter as a result. 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. ignition coil 1
In addition, it is possible to prevent the generation of heat in the transistors 01 and 102 from increasing, and also to prevent the ignition performance from deteriorating due to the shortening of the conduction period of the primary current at high speeds.

In the present invention, it is not necessary to control the conduction time of the primary current in this manner, and the third integrating circuit 6 and comparison circuit CM2 can be omitted. When the third integration circuit 6 and comparison circuit CM2 are omitted, the ignition signal V always starts from the position θ2° where the second pulse signal Vp2 disappears.
i will rise.

[Other Embodiments] In the above embodiments, a current interrupt 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.
01, a spark plug 103, an exciter coil 110 provided in a magnet generator driven by an internal combustion engine and having one end 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 1 is input to the positive phase input terminal of the comparator circuit CM1, and the second integrated voltage V2 is input to the positive phase input terminal of the comparator circuit CM1.
It is input to the negative phase input terminal of M1. 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 V2, the potential of the output terminal of the comparator circuit CMI becomes high level, and a trigger signal is applied to the thyristor 113. It will be done.

Therefore, the rising edge of the ignition signal Vi becomes a portion containing information on the ignition position.

In each of the above embodiments, a variable resistor VRI 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 GO, this variable resistor can be used instead. Of course, a fixed resistor may also be used. Similarly, if there is no need to adjust the time constant for initial charging of the integrating capacitor C1, use the variable resistor VR.
2 can be replaced by a fixed resistor.

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 waveform of the first integrated voltage is divided into a second slope portion whose slope is smaller than the first slope portion and the second slope portion, and the second slope portion. Since the curved waveform has a third slope part whose slope is even smaller than that of the third slope part, it is possible to perform an advance angle calculation with a characteristic of rapidly advancing the ignition position from the set rotation speed and then gradually advancing the ignition position. . Therefore, it is possible to compensate for delays in the ignition position at high speeds due to circuit drift elements, and to keep the ignition position device constant in the high-speed range, or to advance the ignition position in the high-speed range. This has the advantage of preventing the engine output from decreasing.

[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, Tri, Tr2...Transistor, Go...Ignition interval signal generation capacitor,
VRl, VR2... Variable resistor, 4... First integrating circuit, R1-R3... Resistor, Tr3... Transistor, C1... Integrating capacitor, 5... Second integrating circuit , 6... Third integration circuit, 7... Ignition signal output circuit.

Claims (1)

[Scope of Claims] A pulse signal generation circuit that outputs a first pulse signal and a second pulse signal at a first rotational angular position and a second rotational angular position, respectively, of an internal combustion engine; an ignition interval signal generation circuit that receives a pulse signal as an input and outputs an ignition interval signal that lasts from a first rotational angular position to a second rotational angular position; a first integrating circuit that performs an integral operation up to a second rotational angular position and generates a first integrated voltage; A second voltage generator that generates a second integrated voltage that increases at a predetermined slope until the next second rotation angle position.
an ignition circuit that compares the first integrated voltage and the second integrated voltage, and sets a position where the first integrated voltage is equal to or higher than the second integrated voltage as an ignition position, and includes information on the ignition position. an ignition signal output circuit for outputting a signal; and an ignition signal output circuit for ignition on the secondary side of the ignition coil by controlling the primary current of the ignition coil to suddenly change at an ignition position determined by the ignition signal using the ignition signal as input. An ignition device for an internal combustion engine comprising an ignition circuit that generates a high voltage of a capacitor charging circuit that charges a signal generating capacitor; a capacitor discharging circuit that discharges the capacitor at a constant time constant from the position where the first pulse signal disappears; and a reset circuit that instantaneously discharges the capacitor, and the first integrating circuit conducts when the voltage across the integrating capacitor and the ignition interval signal generation capacitor rises to cause the integrating capacitor to become connected to the first integrating capacitor. an initial charging switch circuit that charges with a time constant of an additional charging circuit for additionally charging the integrating capacitor with a second time constant larger than the first time constant using a terminal voltage of the ignition interval signal generating capacitor until Device.