JPS62233478A - Ignition device for internal combustion engine - Google Patents

Abstract

PURPOSE:To eliminate a specific circuit for obtaining advance and retard characteristics and thereby simplify a circuit structure, by providing three integrating circuits for generating three kinds of integral voltages having predetermined characteristics, and comparing these integral voltages with each other to generate a trigger signal. CONSTITUTION:In an ignition device having an ignition circuit 1 wherein a semiconductor switch 104 is operated to provide a high ignition voltage for a secondary coil of an ignition coil 101, and the semiconductor 104 is controlled by an ignition position control circuit 3, the ignition position control circuit 3 includes a signal generating means 3A for generating maximum and minimum advance position signals, and further includes an output circuit 3E for generating a trigger signal according to outputs from first to third integrating circuits 3B-3D. The control circuit 3 further includes a minimum advance position trigger circuit 3F for defining an ignition position at greatly low speed running of an engine and a retard characteristic adjusting circuit 3G. The output circuit 3E compares a first integral voltage with second and third integral voltages and outputs the trigger signal, thus obtaining advance and retard characteristics.

Description

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

[Prior Art] Generally, an ignition Vt position for an internal combustion engine is composed of an ignition circuit and an ignition position control circuit. The ignition circuit includes an ignition coil configured by winding a primary coil and a secondary coil around an iron core;
One of the ignition coils operates when a trigger signal is given.
A semiconductor switch that causes a change in the secondary current is provided, and the operation of the semiconductor switch generates a high voltage for ignition in the secondary coil of the ignition coil. The ignition position control circuit is
The ignition position is controlled by controlling the timing of applying the trigger signal to the semiconductor switch according to the rotational speed of the internal combustion engine.
Control.

In general, internal combustion 41iO11 requires characteristics in which the ignition position is constant in the extremely low speed range, the ignition position is advanced in the low to medium speed range, and the ignition position is characterized in the high speed range. However, depending on the engine, it may be necessary to have a characteristic that retards the ignition position in the high speed range. For example, in a 21 nite internal combustion engine, it may be necessary to retard the ignition position in the high speed range in order to improve the output characteristics in the high speed range.

In addition, even in a 4-N engine, it may be necessary to retard the ignition position in a high-speed region to prevent overspeeding of the engine.

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

An object of the present invention is to enable advance angle and retard angle characteristics to be obtained without separately providing control circuits for advance angle and retard angle, and to adjust advance angle characteristics and retard angle characteristics individually. An object of the present invention is to provide an ignition device for an internal combustion engine.

[Means for Solving the Problems 1] As seen in FIG. 1 showing an embodiment of the present invention,
It comprises an ignition coil 101 and a semiconductor switch 104 that operates when a trigger signal is applied to cause a change in the primary current of the ignition coil 101. An ignition device for an internal combustion engine, comprising an ignition circuit 1 that obtains a high voltage for ignition, and an ignition position control circuit 3 that controls the timing of applying a trigger signal to a semiconductor switch according to the rotational speed of the internal combustion engine.
Simple four-way configuration with advanced and retarded angle characteristics! ? I made it possible to do so.

Therefore, in a3 of the present invention, the signal generating means 3A outputs a maximum advance position signal and a minimum advance position signal that respectively determine the maximum advance position and minimum advance position of the internal combustion engine to the ignition position control circuit 3. , first to third integrating circuits 3B to 3D that obtain first to third integrated voltages Vcl to VC3, and a trigger signal to be applied to the semiconductor switch 104 using the first to third integrated voltages 3B to 3D as inputs. Trigger signal output circuit 3 for lead/retard control to output
E, a minimum advance position trigger circuit 3F for determining the ignition position when the engine is running at low speed, and a d color characteristic adjustment circuit 3G are provided.

The first integrating circuit 3B includes a first integrating capacitor and a first integrating capacitor υ control circuit that controls charging and discharging of the first integrating capacitor by inputting the output of the signal generating means. , the first integral capacitor is almost instantaneously charged to a constant voltage at the maximum advance position, and then the first integral capacitor is charged at a constant time constant until the minimum advance position, and the ignition position is moved from the ignition position to the minimum advance position. An integral operation is performed to discharge the battery.

The second integrating circuit 3C includes a second integrating capacitor and a second integrating capacitor (control circuit) that controls charging and discharging of the second integrating capacitor using the output of the signal generating means as input, and each At the minimum advance angle position, the second integrating capacitor is almost instantaneously charged to a constant voltage, and an integral operation is performed to charge the second integral capacitor 11i at a constant time constant to the minimum advance angle position.

The third integrating circuit 3D communicates with the third integrating capacitor 13.
1) a control circuit for controlling charging and discharging of the third integrating capacitor using the output of the generating means as an input, and controlling the third integrating capacitor from each minimum advance position to the next minimum advance angle. An integral operation is performed in which the third integral capacitor is charged at a constant time constant up to the ignition position, and the third integral capacitor is almost instantaneously discharged from the ignition position to the next minimum advance position.

The lead angle U angle control trigger signal output circuit 3E converts the first integral voltage 1q across the first integrating capacitor to 4! across the second and third integrating capacitors, respectively. A trigger signal Vo to be applied to the semiconductor switch is output when the first integrated voltage is higher than both the second integrated voltage and the third integrated voltage compared to the second and third integrated voltages which are -1β.

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

The R color characteristic adjustment circuit 3G detects the second integrated voltage and sets the second integrated voltage (via the time constant adjustment switch circuit and the time constant adjustment switch circuit that become conductive when the second integrated voltage reaches the self). It has a time constant-regulating resistor connected in parallel to the charging lft resistor of the first integrating circuit.

In addition, in the above configuration J'3, in the third integrating circuit, if charging is started after the third integrating capacitor is avoided instantaneously discharging at each minimum advance angle position, the charging starting position is Although it will be slightly delayed from the minimum advance angle position, since this delay is slight, this charging start position is regarded as the minimum advance angle position.

When configuring an actual circuit in this way, there may be some deviation in the start and end timing of charging or discharging each integrating capacitor due to the response time of the circuit components19. It goes without saying that the similar responses that occur in circuits due to circuit technology are within the technical scope of the present invention.

[Operation of the Invention] In the above configuration, the time from the generation of the minimum advance angle position signal to the generation of the minimum advance angle position signal and each 1! The time from when the small advance position signal is generated to when the next minimum advance position signal is generated becomes shorter as the engine rotational speed increases, and as a result, the first integrating capacitor The charging time of the third integrating capacitor and the discharging time of the second integrating capacitor become shorter. Therefore, the first integrated voltage at the maximum advance position is constant, but
The first integrated voltage at the minimum advance position gradually becomes lower as the rotational speed increases. Also, the second position at the maximum advance angle position
9 The integrated voltage increases as the rotation speed increases.

Further, the third integrated voltage at each maximum advance angle position and minimum advance angle position becomes lower as the rotational speed increases. Therefore, by comparing the first integrated voltage with the second and third integrated voltages,
If the trigger signal is generated when the integrated voltage of It is possible to obtain various ignition characteristics such as ignition angle and retardation in the high speed range.

As described above, according to the present invention, a trigger signal is generated by comparing the first integrated voltage with the second and third integrated voltages using a common trigger signal output circuit for advance angle control. Since lead angle and retard angle characteristics are obtained, the circuit configuration can be simplified.

Further, when the R erogenous adjustment circuit 3G is provided as described above, when the rotational speed of the internal combustion engine reaches the set value and the second integrated voltage reaches the set value, the time constant adjustment switch circuit becomes conductive and the time constant is adjusted. The adjustment resistor is connected in parallel to the charging resistor of the first integrating circuit.

This reduces the charging time constant of the first integrating circuit,
The slope of the rise in the first integrated voltage becomes steeper, and the retardation characteristic changes. Therefore, the resistance value of the time constant adjustment resistor, the set value of the rotation speed that starts the conduction of the time constant adjustment switch circuit,
By adjusting the slope of the second integral voltage, etc., it is possible to adjust the retard characteristic in a high-speed region higher than the set rotational speed, and the retard characteristic can be adjusted separately from the advance characteristic. .

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

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

The ignition circuit 1 in this embodiment is a well-known condenser discharge type circuit, and includes a primary coil 101a and a primary coil 101a whose one end is grounded.
The ignition coil 101 having the secondary coil 101b and the machine II
A spark plug 102 is installed in the cylinder I and connected to the secondary coil of the ignition coil 101, and an ignition energy storage capacitor 103 is provided on the primary side of the ignition coil.
, a discharge control thyristor (semiconductor switch) 104 provided to discharge the charge of the capacitor 103 to the primary coil 101a of the ignition coil when conductive, and the capacitor by the induced voltage in the arrow direction of the exciter coil 2. Charge 103? I! yru capacitor charging diode 1
05. In this ignition circuit, a capacitor 103 is charged to the illustrated polarity through a diode 105 by the output of the exciter coil 2, and then when a trigger signal is given to the thyristor 104, the thyristor
04 conducts and transfers the charge of the C capacitor 103 to the primary coil 101a of the ignition coil M? let fi. This causes a large magnetic flux change in the iron core of the ignition coil, and an rX voltage is induced in the secondary coil 101b. Since this high voltage is applied to the spark plug 102, a spark is generated in the spark plug and the engine is ignited. However, in this ignition circuit J3, the thyristor 104 is triggered to operate, and sometimes to perform an ignition operation.

The ignition circuit used in the present invention is not limited to the one shown in the example of the ignition circuit, but may include an ignition coil and a semiconductor switch that operates when a trigger signal is applied to cause a change in the primary current of the ignition coil. The operation of the semiconductor switch causes the secondary coil of the ignition coil to receive ignition l! Any circuit that can obtain 15 voltages is sufficient. For example, a coil (a primary coil of an ignition coil or a coil provided separately from the primary coil)
Various current interrupting type ignition circuits are used to obtain high voltage for ignition by interrupting the current flowing through the coil at the ignition position by operating a semiconductor switch, and boosting the voltage induced in the coil by the ignition coil. It can also be used.

The ignition position n control circuit 3 includes a semiconductor switch (
, in the above example, the timing of applying the trigger signal to the thyristor 104) is controlled according to the rotational speed of the internal combustion engine II? 1' to control the ignition position, and this ignition position control circuit 3 generates a maximum advance position signal and a minimum advance position signal that respectively determine the maximum advance position and minimum advance position for internal combustion +1 open. The signal generating means 3A to output, and the first to third
The first to third integrator circuits 3B to 3D obtain integrated voltages C1 to VC3, and the trigger signal V(J) is applied to the semiconductor switch of the ignition circuit 1 using the first to third integrated voltages as input. It is composed of an angle retard control trigger signal output circuit 3F, a minimum advance position trigger circuit 3F that determines the ignition position when the engine is running at extremely low speed, and a retard characteristic adjustment circuit 3G.

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

In FIG. 2, the configuration of the ignition circuit 1 is basically the same as that shown in FIG.
7 are connected in parallel.

The power supply circuit 4 includes a series circuit of a diode D1 connected to both ends of the exciter coil 2, a resistor R1, and a power supply capacitor C1, and a Zener diode Z1 connected in parallel to both ends of the capacitor C1. this'! l
In the i source circuit inversion circuit, the power supply capacitor C1 is charged to the polarity shown by the induced voltage of the exciter coil 2 in the direction of the arrow shown in the drawing, and the terminal voltage of this capacitor C1 is kept almost constant by the Zener diode Z1. Therefore, a substantially constant DC voltage for operating the ignition position control circuit 3 is obtained across the power supply capacitor C1.

Among the components of the ignition position control circuit 3, the signal generating means 3△
consists of a signal coil 300 provided in a signal generator, and one end of the signal coil 300 is grounded. As shown in FIG. 3A, this signal coil 300 generates the maximum advance position signal VSI at the maximum advance position θa of the engine, and outputs the minimum advance position signal VS2 at the minimum advance position θd'''C. The maximum advance angle position signal VS1 and the minimum advance angle position signal Vs2 of this embodiment are composed of pulse-like signals of negative polarity and positive polarity, respectively, and the maximum advance angle position θa and the minimum advance angle position θ
At d, the threshold level reaches Vt or higher.

The first integrating circuit 3B includes a first integrating capacitor Cil, and a first integrating capacitor control circuit that controls charging and discharging of the first integrating capacitor Cil by inputting a maximum advance angle position signal and a minimum advance angle position signal. This first integrating capacitor i control circuit consists of transistors Tr1 to T
It consists of R3, capacitors C3 and C4, resistors R3 to R5, and diodes D2 to D4. The base of the transistor Tr1 is grounded, and the emitter is connected to the non-ground terminal of the signal coil 300 via a diode D2. The collector of the transistor Tr1 is connected to the base of the transistor Tr2, and the collector of the transistor Tr2 is connected to the base of the transistor Tr2.
The emitter of is connected to the non-ground terminal of the ffi source capacitor C1. A capacitor C3 is connected between the collector of the transistor Tr2 and the ground, and a voltage dividing circuit consisting of a series circuit of resistors R3 and R4 is connected to both ends of the capacitor C3. The base of the transistor Tr3 is connected to the voltage dividing point of this voltage dividing circuit, and the collector of this transistor is connected to the non-grounded terminal of the capacitor C3. A capacitor I is connected between the collector pace of transistor Tr3.
t C4 is connected, and a charging resistor R5 is connected between the collector and emitter. The first integrating capacitor Ci1 is connected between the emitter of the 1-transistor Tr3 and ground;
The terminal voltage of the capacitor C3 charges the first integrating capacitor Cil between the collector and emitter of the transistor r3 and through the resistor R5. A diode D3 is connected in parallel between the collector and emitter of the transistor Tr3 with its cathode facing the collector side of the transistor Tr3, and the anode of a diode D4 is connected to the collector of the i-transistor Tr2.

The second integrating circuit 3C includes a second integrating capacitor Ci2 and a second integrating capacitor control circuit that controls charging and discharging of the second integrating capacitor by inputting the maximum advance angle position signal and the minimum advance angle position signal. , the second integrating capacitor control circuit includes transistors TR4, 1-R5, diodes D5, D6, and resistors R6, R7. The emitter of the transistor Tr4 is grounded, and the base is connected to the signal coil 300 via a resistor R6 and a diode D5.
connected to the non-grounded terminal of the Transistor Tr4
The collector of J
- The emitter of transistor Tr5 is connected to the non-grounded terminal of transistor Tr5 via diode D6, and the emitter of transistor Tr5 is connected to power supply capacitor C3.
It is connected to the non-grounded terminal of No.1. A second integrating capacitor Ci2 is connected between the collector of the transistor Tr5 and the ground, and a discharging resistor R7 is connected to both ends of the second integrating capacitor.

In this example, the transistors 1 to Tr4 also serve as switching means for resetting the first integrating capacitor C11, and when the transistor Tr4 is conductive, the first integrating capacitor Cil is connected to the diodes D3 and D4 and the transistor Tr.
A discharge occurs between the collector and emitter of 4.

Next, the third integrating circuit 3D connects the third integrating capacitor Ci
3, and a third integrating capacitor control circuit that controls charging and discharging of this third integrating capacitor, and the third integrating capacitor control circuit includes a transistor TR4 and a resistor R4.
6, R8 and diodes D5 and D7. One end of the resistor R8 is connected to the non-grounded terminal of the power supply capacitor C1, and the third integrating capacitor Ci3 is connected between the other end of the resistor R8 and ground. The non-grounded terminal of the third integrating capacitor Ci3 is connected to the collector of the transistor 1r4 through the diode D1. In this example, the transistor Tr4, the diode D5, and the resistor R6 serve as the components of the second integration circuit and the third integration circuit.

The trigger signal output circuit 3E for advance/retard control consists of a programmable unijunction transistor P1, a resistor R9, and diodes D8 and D9. Noku Nairisuta 104
connected to the gate. The anode of the programmable unijunction transistor P1 is connected to the non-grounded terminal of the first integrating capacitor C11, and the gate is connected to the non-grounded terminals of the second and third integrating capacitors Ci2 and Ci3 via diodes D8 and D9, respectively. It is connected.

The minimum advance angle position trigger circuit 3F consists of a diode D5 and a resistor R10, one end of the resistor RIO is connected to the non-ground terminal of the signal coil 300 via the diode D5, and the other end is connected to the gate of the thyristor 104. ing.

The retard characteristic adjustment circuit 3G includes a second integrating capacitor Ci2.
When the terminal voltage Vc2 of the terminal voltage Vc2 is detected and the terminal voltage (second integral voltage) reaches the set value, the first integral It is composed of a time constant adjustment resistor R11 connected in parallel to the charging resistor R5 of the circuit,
The time constant adjustment switch circuit 3ql is a transistor Tr.
6 and Tr7, a resistor [2, and a Zener diode Z2.

The emitter of the transistor king r6 is grounded, and the base is connected to the non-grounded terminal of the second integrating capacitor Ci2 through a resistor R12 and a Zener diode Z2.

The collector of the transistor Tr6 is connected to the base of the transistor Tr7, and the emitter of the transistor Tr7 is connected to the non-ground terminal of the capacitor C3. One end of a time constant adjusting resistor R11 is connected to the collector of the transistor Tr7, and the other end of this resistor R11 is connected to a first
[integral] is connected to the non-grounded side terminal of the circuit.

In the first integrating circuit J3 on the 3rd day, the minimum advance angle position θ
a The knee signal coil 300 receives the maximum advance position signal Vs1
When this happens, transistors Tr1 and σ2 become conductive, charging the capacitor C3 to 1.1 instantaneously. When this capacitor C3 is charged, the transistor Tr3 becomes conductive, and the first integrating capacitor Cil is charged instantly.The terminal voltage of this first integrating capacitor QN is the capacitor C.
When a voltage value obtained by dividing the terminal voltage of No. 3 by resistors R3 and R4 is reached, transistor rr3 is cut off, and from then on, first integrating capacitor Cil is charged at a constant time constant through charging resistor R5. This first integrating capacitor Ci
1 is a diode D3 when the signal coil 300 generates the minimum advance angle position signal VS2 and the transistor Tr4 becomes conductive.
and discharge through D4.

The waveform of the first integral voltage Vc1 (both ends of the first integral capacitor Cil) is as shown in Fig. 3B, and after rising to a constant voltage at the maximum advance position θa, it is additionally charged and the minimum advance is reached. The waveform returns to zero at the angular position θd.

In the second integration circuit 3C, the minimum advance angle position Od
The transistor Tr4 becomes conductive at
The transistor Tr5 becomes conductive and the second integral]
i2 will be charged instantly. Since the transistor Tr4 is conductive only for a very short time while the minimum advance position 16 signal is generated, the second integral capacitor Ci2 is charged instantaneously at the minimum advance position and then discharged at a constant time constant through the resistor R7. . 19 across the second integrating capacitor Ci2
The waveform of the integrated voltage VC2 is as shown in Figure 3, and is a waveform that instantaneously rises to a constant voltage at each minimum advance angle position and then falls at a constant slope.

In the third integrating circuit 3D, the third integrating capacitor Ci3 is charged with the voltage of the electrical capacitor C1 through the resistor R8 at a constant time constant. When the transistor Tr4 becomes conductive at the minimum advance position, the charge in the capacitor Ci3 is instantly discharged.

The BOGRAM pull unijunction transistor P1 of the trigger signal output circuit 3E for advance/retard control has a first integrated voltage MCI that is equal to the second and third integrated voltages VC2 and VC3.
When the anode voltage becomes higher than the gate voltage, it becomes conductive and supplies a trigger signal to the Nyristor (semiconductor switch) 104 of the ignition circuit.

A trigger signal is given to the thyristor 104 of the ignition circuit 1 through the diode D5 and the resistor R10 when the output Vs2 of the H path angle position trigger circuit 3Ft is signaled at the minimum advance angle position θd.

In the retard characteristic adjustment circuit 3G, the second integral voltage VC
2 becomes equal to or higher than the Zener level VZ2 of the Zener diode Z2, the transistor Tr6 becomes conductive, and due to the conduction of the transistor Tr6, the transistor Tr7 becomes conductive, and the time constant adjusting resistor R11 becomes the charging resistor R5 of the first integrating circuit. connected in parallel to This allows the first
The charging time constant of the first integrating capacitor C11 becomes smaller, and charging of the first integrating capacitor C11 is accelerated.

In the above embodiment, the time from when the maximum advance position signal VS1 is generated until the minimum advance position signal Vs2 is generated, and from when each minimum advance position signal VS2 is generated to when the next minimum advance position signal Vs2 is The time it takes for this to occur becomes shorter as the engine speed increases, and as a result, the first integral capacitor C11 and the third integral capacitor Ci3
The charging time of the second integrating capacitor Ci2 and the discharging time of the second integrating capacitor Ci2 become shorter. Therefore, the first integrated voltage VC1 at the maximum advance position θa is constant, but the first integrated voltage VC1 at the minimum advance position Vd gradually becomes lower as the rotational speed increases. Further, the second integrated voltage at the maximum advance position increases as the rotational speed increases. Furthermore, the third integrated voltage VC3 at each maximum advance angle position and minimum advance angle position decreases as the upper limit of the rotational speed increases.

Therefore, if the first integrated voltage is compared with the second and third integrated voltages and the trigger signal is generated when the first integrated voltage becomes higher than both the second and third integrated voltages, the following is true: By appropriately setting the integral constant of each integral circuit as shown in 1, it is possible to obtain various ignition viscosity that advances in the low and medium speed range and retards in the high speed range.

For example, as shown in Fig. 4, when the rotational speed of the internal combustion engine is less than the advance start rotational speed Na (for example, N1), the period from when the maximum advance position signal is generated until when the minimum advance position signal is generated is The time is quite long and the second integral content 1°C
Since there is sufficient time for discharging i2 and charging time for the third integrating capacitor Ci3, the first integrating capacitor is instantly charged to a constant voltage by the pass-through advance device θa as shown in Figure 4. At this time, the terminal voltage (second integral voltage) VC2 of the second integral capacitor Ci2 is lower than the terminal voltage (first integral voltage) VCl of the first integral capacitor, and the terminal voltage of the third integral capacitor Ci2 is lower than the terminal voltage (first integral voltage) VCl of the first integral capacitor. The voltage (third integrated voltage) VC3 remains higher than the first integrated voltage VC1 even when the minimum advance angle position Od is reached. Therefore, this trigger signal output circuit for 11-advanced angle retard control does not output a trigger signal. At this time, the semiconductor switch of the ignition circuit is triggered by the output of the minimum advance position trigger circuit, and the ignition 1FIt operation is performed at the minimum advance position θd.

When the rotational speed of the internal combustion engine enters the low-medium speed region and the rotational speed N exceeds the advance angle starting rotational speed Na+:, for example, N2,
At the maximum advance angle position, the first integral voltage VC1 exceeds the second integral voltage VC2 at J, and at the position where the phase is more advanced than the minimum advance angle (ffQOd), the first integral voltage C1 exceeds the third integral voltage V
It will exceed C3. In such a situation, the first
When the integrated voltage Vc1 exceeds the third integral J, EVc3 at the angle θ1 position where the phase is advanced from the minimum advance position, a trigger signal is given to the semiconductor switch of the ignition circuit, and the ignition is activated at this θ1 position. will be carried out. The position where the first integrated voltage Vc1 exceeds the third integrated voltage Vc3 is 1
Since the ignition position advances as the rotational speed of the engine increases, the ignition position advances as the upper limit of the engine rotational speed increases.

If the rotational speed N exceeds the advance end rotational speed Nb, for example N3.
Then, at the maximum advance angle position θa, the first integral voltage VC1 exceeds the second integral voltage Vc2 and becomes equal to or lower than the third integral voltage Vc3. When this happens, a trigger signal is generated at the maximum advance position Oa, and ignition occurs at the maximum advance position θa! l1IJ production will be performed.

When the rotational speed N exceeds the W angle IM starting rotational speed and reaches, for example, N4, the second integral voltage JfVC2 becomes higher than the first integral voltage Vc1 at the maximum advance angle position 〇〇,
The first integral voltage VC1 does not change to the second integral voltage V until it reaches the position of the angle θ2, which is delayed in phase by the maximum advance angle position θa.
It will exceed C2. Therefore, in this state, the ignition operation is performed at the angle θ2 with the phase delayed by the maximum advance angle position θaJ. As the rotational speed N further increases, the position where the first integrated voltage exceeds the second integrated voltage is further delayed.
The ignition position δ is further delayed, and when it reaches the minimum advance position at the set rotational speed N, the retardation of the ignition position stops and the ignition position becomes constant (minimum advance position).

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

First, the rotation speed at which the first integral voltage and the third integral voltage become equal at the maximum advance position θa (advance end rotation rotation speed) N
From b, the rotation speed at which the first integrated voltage and the second integrated voltage are equal at the maximum advance position (ff angle starting rotation speed>Nc
By setting the integration constants (charging time constant or discharging time constant) of the first to third integration circuits so as to increase l, the advance angle starting rotation can be adjusted as shown by the line a in Fig. 5. The ignition position is advanced from the speed Na to the advance end rotational speed Nb, the ignition position is constant from the advance end rotational speed Nb to the retardation start rotational speed NC, and the ignition position is constant in the area of the retardation end rotational speed Nd or higher. characteristics are obtained.

a rotation speed at which the first integral voltage and the third integral voltage are equal at the maximum advance position Oa (advance end rotation speed);
The integration constants of the first to third integration circuits are set so that the rotational speed at which the first integrated voltage and the second integrated voltage are equal at the maximum advance position (f1 angle starting rotational speed) is the same speed Nek: As shown in the 1h line in Fig. 5, if , the angle is advanced from the advance start rotation speed Na to the rotation speed Ne, and the area from the rotation speed Ne to the retard start rotation speed Nd is set. The characteristic that the ignition position is retarded is obtained.

Furthermore, the rotation speed (i
If the integration constants of the first to third integration circuits are set so that the ff angle IFtl (initial rotation speed) is low, the fifth
As shown by the polygonal line C in the figure, the ignition position is advanced from the advance start rotational speed NG to the rotational speed Nf, and the ignition position is retarded in the region from the rotational speed Nf to the retardation start rotational speed NQ. In this case, the advance angle operation stops before the angle advances to the maximum advance angle position θa, and shifts to the retard angle operation.

In the above embodiment, if the retard characteristic adjustment circuit 3G is not provided, the charging time constant of the first integral capacitor C11 is constant, so the first When the integral constant of the integrating circuit is set, the R color characteristic is also almost fixed, and the R color characteristic cannot be adjusted separately from the advance angle characteristic.

On the other hand, as in the above embodiment, the retard characteristic adjustment circuit 3
By setting G, it is possible to adjust the retard angle characteristics separately from the adjustment of the advance angle characteristics. Furthermore, if the rotational speed of the internal combustion engine is lower than the set value, for example N3, then the sixth
As shown in Figure A, the second integral voltage becomes less than the set value V12 before the maximum advance position Oa, so as shown in Figure , '+1111<maximum advanced angle position Oa), the transistor 7 r6 and Tr7 are in the cut-off state. Therefore, resistance 1 and 11 are the first integral condenser 1 and C1.
1 does not have the same effect on charging.

On the other hand, when the engine speed exceeds the set value, for example N4, the terminal voltage of the second integrating capacitor Ci2 reaches the Zener level Vz2 of the Zener diode Z2 until the middle of the charging period of the first integrating capacitor Cil. Therefore, as shown in Figure 6B, transistors Tr6 and Tr7 are conductive to the middle of the section from the maximum advance position θa to the minimum advance position θd, and the resistor R11 is connected to the resistor R5. connected in parallel. In the section where the resistor R11 is connected in parallel to the resistor R5, the charging time constant of the first integrating capacitor Ci1 becomes small, and the slope of the terminal voltage (first integrated voltage) of the first integrating capacitor Ci1 is as follows. It gets sudden. When the discharge of the second integrating capacitor progresses and the second integrated voltage becomes lower than the Zener level Vz2 of the Zener diode Z2, the transistors [r6 and 7
r7 becomes blocked and 11'5 constant adjustment Ill low resistance R
11 is disconnected, the charging time constant of the first integrating capacitor Ci1 returns to the original value. 'ii/I'lB+ in the section where the slope of the terminal voltage of the first integrating capacitor is steep
The characteristic has a smaller slope than the case where the R color characteristic adjustment circuit 3G is not provided.

In the case of using the retard characteristic adjustment circuit 3G of the above embodiment,
By changing the Zener level VZ2 of the Zener diode Z2, changing the resistance value of the resistor 1 (11), and changing the discharge time constant of the second integrating capacitor Ci2, J:
Therefore, various retard characteristics can be obtained. FIG. 7 shows an example of the retard characteristic obtained by the retard characteristic adjustment circuit 3G, in which al is the retard characteristic adjustment circuit 3B.
If not provided, a2 is the case where the Zener level VZ2 of the Zener diode z2 is lower than the voltage at the rise of the first integral voltage Vcl and the transistor Tr7 is made conductive until the end of the retardation (minimum advance position). be. Also a3
makes the transistor Tr7 conductive to the middle of the section from the maximum advance angle position to the minimum advance angle position to generate the first integrated voltage VC1.
A4 shows the case where the slope of the first integrating capacitor is made steep by making the transistor Tr7 conductive from the middle of the section from the maximum advance angle position to the minimum advance angle position. be.

In the above embodiment, the cathode of the Zener diode Z2 of the retard characteristic adjustment circuit 3G is connected to the second integrating capacitor Ci2.
However, as shown in FIG. 8, a resistor R1 is connected across the second integrating capacitor Ci2.
A voltage dividing circuit consisting of 3 and R14 is connected, and the cathode of a Zener diode Z2 is connected to the voltage dividing point of this voltage dividing circuit, and the conduction period of the transistor Tr6 is determined by the voltage obtained by dividing the second integrated voltage. (+15 constant adjustment switch circuit 3 (+1 conduction period) can be set. In the configuration shown in FIG.
However, if the Zener diode Z2 is connected to the second integrating capacitor yCr2 via a voltage divider circuit as shown in Fig. 8, the second integrated voltage will be clamped by the Zener diode Z2. This eliminates the risk of

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

In the above embodiment, a circuit for discharging the second integrating capacitor to zero voltage is not provided, but the second integrating capacitor is discharged between the ignition position and the minimum advance position. It is also possible to provide a circuit that makes the residual electric current zero at the advance angle position δ.

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

In the above embodiment, a programmable unijunction transistor is used as the integral voltage comparison means used in the trigger signal output circuit 3F for advance/retard control, but a voltage comparator using a sieve amplification device or the like is used as the integral voltage comparison means. Of course, it is possible to use .

[Effects of the Invention] As described above, according to the present invention, after rising to a certain level at the maximum advance position, it rises at a certain slope and returns to zero in the darkness from the ignition position to the minimum advance position t. a first integrated voltage;
A second integrated voltage that rises to a predetermined level at the minimum advance position and decreases at a constant slope, and then increases from the minimum advance position at a constant slope from the JJ engineering fire position to the next minimum advance position. and a third integrated voltage that returns to zero during the period, and generate a trigger signal when the first integrated voltage becomes higher than both the second integrated voltage and the third integrated voltage. niJ:
Since the lead angle and retard characteristics are set to 19, there is no need to separately provide a circuit to iR the lead angle characteristics and a circuit to obtain the retard characteristics, which has the advantage of simplifying the circuit configuration. .

In particular, in the present invention, a retard characteristic adjustment circuit is provided, and when the rotational speed of the internal combustion engine reaches a set value and the second integrated voltage reaches the set value, the time constant is adjusted by making the time constant adjustment switch circuit conductive. Since the charging resistor is connected in parallel with the charging resistor of the first integrating circuit, the charging resistor of the first integrating circuit is
The advantage is that the retard characteristic can be changed by changing the slope of the rise in the integral voltage, and the retard characteristic in a high-speed region above the set rotational speed can be adjusted separately from the advance characteristic.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram showing the overall configuration of an embodiment of the present invention, Fig. 2 is a circuit diagram showing an embodiment embodying the configuration of Fig. 1, and Fig. 3 shows each part of Fig. 2. FIG. 4 is a waveform diagram illustrating the advance and retard operations of the embodiment shown in FIG. 2, and FIG. FIG. 6 is a waveform diagram for explaining the operation of the retard characteristic adjustment circuit used in the embodiment of FIG. 2, and FIG. 7 shows various retard characteristics produced by the retard characteristic adjustment circuit. The J diagram and FIG. 8 are circuit diagrams showing the main parts of the third embodiment of the present invention. 1... Ignition circuit, 2... Equinator coil, 3...
- Ignition timing control circuit, 4... Power supply circuit, 3A... Signal generating means, 3B... First integrating circuit, 3C... Second integrating circuit, 3D... Third integrating circuit , 3E...
Trigger signal output circuit for advance/retard 1til control, 31:・
...Minimum advance angle position trigger circuit, 3G...Retard angle characteristic adjustment circuit, 3 (11...Time constant adjustment switch circuit, C1
1... First integrating capacitor, Ci2... Second integrating capacitor, Ci3... Third integrating capacitor υ, R
5... Resistor for charging, R11... Resistor for adjusting charging time constant. Figure 1 Figure 4 Figure 8 Figure 5 Whistle 6 Figure 7

Claims (1)

[Scope of Claims] An ignition coil and a semiconductor switch that operates when a trigger signal is applied to cause a change in the primary current of the ignition coil, the secondary coil of the ignition coil being activated by the operation of the semiconductor switch. An ignition device for an internal combustion engine, comprising: an ignition circuit that obtains a high voltage for ignition; and an ignition position control circuit that controls the timing of applying a trigger signal to the semiconductor switch according to the rotational speed of the internal combustion engine. The control circuit includes a signal generating means for outputting a maximum advance position signal and a minimum advance position signal that respectively determine a maximum advance position and a minimum advance position of the internal combustion engine, a first integrating capacitor, and an output of the signal generating means. a first integrating capacitor that controls charging and discharging of the first integrating capacitor by inputting
an integral capacitor control circuit, which charges the first integral capacitor almost instantaneously to a constant voltage at the maximum advance position, and then adds the first integral capacitor, N, at a constant time constant through a charging resistor. a first integrating circuit that performs an integral operation of charging and discharging between the ignition position and the minimum advance position; a second integrating capacitor; a second integral capacitor control circuit for controlling discharge, and charging the second integral capacitor almost instantaneously to a constant voltage at each minimum advance position and then at a constant time constant until the next minimum advance position. a second integrating circuit that performs an integrating operation to discharge the third integrating capacitor, and a third integrating circuit that controls charging and discharging of the third integrating capacitor by inputting the output of the third integrating capacitor and the signal generating means.
an integral capacitor control circuit that charges the third integral capacitor from each minimum advance position to the next minimum advance position with a constant time constant, and charges the third integral capacitor from each minimum advance position to the next minimum advance position with a constant time constant. a third integrating circuit that performs an integrating operation to return the terminal voltage of the third integrating capacitor to zero; and a first integrated voltage obtained across the first integrating capacitor to the second and third integrating circuits. a trigger signal provided to the semiconductor switch when the first integrated voltage is higher than both the second integrated voltage and the third integrated voltage as compared to the second and third integrated voltages respectively obtained across the capacitor; a trigger signal output circuit for advance/retard control that outputs a lead/retard control; a minimum advance position trigger circuit that provides a trigger signal to the semiconductor switch based on the minimum advance position signal; a time constant adjusting switch circuit that becomes conductive when the second integrated voltage reaches a set value; and a time constant connected in parallel to the charging resistor of the first integrating circuit via the time constant adjusting switch circuit. 1. An ignition device for an internal combustion engine, comprising: a retard characteristic adjustment circuit having an adjustment resistor;