JP3075095B2 - Ignition device for internal combustion engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ignition device for an internal combustion engine which controls an ignition position in accordance with an engine speed by causing an ignition operation to be performed at an ignition position determined by an integral operation.

[0002]

2. Description of the Related Art An ignition device for an internal combustion engine includes an ignition circuit that generates a high voltage for ignition when an ignition signal is given;
An ignition position control circuit for providing an ignition signal to the ignition circuit at an ignition position of the internal combustion engine.

[0003] The ignition circuit includes an ignition coil and a primary current control circuit that causes a sudden change in the primary current of the ignition coil when an ignition signal is given. As an ignition circuit, a capacitor discharge type circuit and a current cutoff type circuit are known.

In a capacitor discharge ignition circuit, an output of an exciter coil provided in a magnet generator provided on a primary side of an ignition coil or an output of a converter circuit for boosting a voltage of a battery is provided before an ignition position. An ignition energy storage capacitor that is charged to one polarity in the section, and a discharge control thyristor that conducts when an ignition signal is supplied and discharges the charge of the ignition energy storage capacitor to the primary coil of the ignition coil. And a primary current control circuit. In this type of ignition circuit, the charge of the capacitor is discharged to cause a sudden change in the primary current of the ignition coil, thereby inducing a high voltage for ignition in the secondary coil of the ignition coil.

In a current interruption type ignition circuit using a battery as a power source, a primary current control circuit is constituted by a primary current control switch connected in series to a primary coil of an ignition coil. In this ignition circuit, the primary current control switch, which is turned on at a position before the ignition position, is turned off at the ignition position, so that the battery flows through the primary coil of the ignition coil and the primary current control switch. The applied current is interrupted, and a high voltage for ignition is induced in the secondary coil of the ignition coil.

When a current cut-off type ignition circuit using a battery as a power source is used, the primary current control switch is provided with a square wave drive signal (the primary current control switch is turned on) at a position before the ignition position. When the drive signal falls to zero, the primary current control switch is turned off and the ignition operation is performed. Therefore, in this case, the change in the fall of the drive signal becomes the ignition signal.

Further, in a current interruption type ignition circuit using a primary coil of an ignition coil provided in a magnet generator as a power source for ignition, a primary current control switch provided in parallel with the primary coil of the ignition coil provides a primary current control switch. A current control circuit is configured. In this type of ignition circuit, the primary current control switch is turned on when a voltage of one polarity is induced in the primary coil of the ignition coil, and when the ignition signal is given at the ignition position, the primary current control switch is turned on. A high voltage for ignition is induced in the secondary coil of the ignition coil by setting the cutoff state.

Whatever type of ignition circuit is used, the position where an ignition signal is given to the ignition circuit is the ignition position. The ignition position control circuit changes the ignition signal generation position so that the ignition position is advanced or retarded in accordance with the engine speed, at least under the control of the engine speed.

Various types of ignition position control circuits are known. One of them is that an ignition position is calculated by an integration operation and an ignition signal is generated at the calculated ignition position. An electronic lead angle type circuit is known. In this type of ignition position control circuit, a signal generator that rotates synchronously with the engine generates first and second signals at a maximum advance position and a minimum advance position of the engine, respectively, and the first and second signals are generated. The ignition position is determined by performing a comparison operation on a plurality of integrated voltages obtained by performing an integration operation by defining an integration section according to.

The signal generator is composed of, for example, a rotor having a reluctor having a polar arc angle equal to the advance angle width, and a signal generator for detecting a change in magnetic flux given by the rotor and generating a signal. . The signal generator includes, for example, an iron core having a magnetic pole portion opposed to the rotor, a signal coil wound around the iron core, and a permanent magnet flowing a magnetic flux through the iron core. The rotor is mounted such that the reactor starts to face the magnetic pole portion of the iron core, and the facing of the reluctor and the magnetic pole portion of the iron core ends at the minimum advance position. In this signal generator, a signal is induced in the signal coil by a change in magnetic flux generated in the iron core when the rotor of the rotor starts to oppose the magnetic pole portion of the iron core and when the opposition ends. In some cases, a magnetic flux change generated by a reluctor is detected by using a magnetic detection element such as a Hall IC instead of the signal coil.

[0011]

An ignition device using an electronic advance type ignition position control circuit is disclosed in Japanese Utility Model Publication No. 3-199.
Various types are proposed as disclosed in Japanese Utility Model Publication No. 12 and Japanese Utility Model Publication No. 2-24952. In the case of a conventional ignition device of this type, for example, as shown by a polygonal line a in FIG. The ignition position is fixed to the minimum advance position θo in the rotation region where the rotation speed N of the engine from the start rotation speed No to the advance start rotation speed N1, and the ignition position is maximized in the region exceeding the advance start rotation speed N1. After the advance to the angular position θ1, the ignition position is shifted to the maximum advance position θ1 in a region exceeding the advance end rotation speed N2.
Is obtained.

When the ignition position is fixed at the minimum advance position in the rotation range below the advance start rotation speed N1, the minimum advance position θo is set to a position suitable for operation at the idling rotation speed Ni. Then, since the ignition position is excessively advanced when the engine is started, a phenomenon (so-called "Ketchin") occurs in which the piston of the engine is pushed back at the time of the starting operation, which may cause harm to the driver.

In order to prevent the occurrence of the click, the minimum advance position is set to a position θ suitable for starting, as shown by a polygonal line B in FIG.
Although it is conceivable to set it to o ', the ignition position at the time of idling is too late, and a problem arises that the engine stalls easily at the time of idling.

As described above, since there is an inconsistent relationship between the characteristics required at the time of starting and the characteristics required at the time of idling operation, a compromise between the two is actually found to set the minimum advance position. Therefore, there is a problem that satisfactory characteristics cannot be obtained both at the time of starting and at the time of idling operation.

Further, in the conventional ignition device, if the minimum advance position is to be changed in accordance with the characteristics required of the engine (for example, if the characteristics of the broken line A in FIG. 5 are changed to the characteristics of the broken line B), Since it is necessary to change the polar arc angle (advance angle width) of the reluctor provided in the rotor of the signal generating device, it is inevitable that the cost required for changing the characteristics increases.

An object of the present invention is to provide an ignition device for an internal combustion engine which can set an ignition position at an idling time and a starting time to an optimum position without changing a configuration of a signal generating device. It is in.

[0017]

According to the present invention, there is provided an ignition circuit for generating a high voltage for ignition when an ignition signal is applied;
An ignition position control circuit for giving an ignition signal to an ignition circuit at an ignition position of the internal combustion engine.

In the present invention, the ignition position control circuit generates a first signal and a second signal which reach threshold levels at the maximum advance position and the minimum advance position of the internal combustion engine, respectively. A reference voltage generation circuit for generating a rectangular-wave-shaped reference voltage from a position at which the first signal reaches the threshold level to a position at which the second signal reaches the threshold level; A first advancing control integration circuit for performing an integrating operation for instantaneously charging an integrating capacitor to a constant voltage at a maximum advancing position with a reference voltage and then additionally charging with a predetermined time constant; and a second advancing control A second advancing control integration circuit for performing an integration operation for charging the integration capacitor with a predetermined time constant, and a second integration operation for charging the first idling control integration capacitor with a predetermined time constant using a reference voltage. One eye A ring control integration circuit, a second idling control integration circuit for performing an integration operation of charging a second idling control integration capacitor with a predetermined time constant, and when the second signal reaches a threshold level A reset circuit for instantaneously discharging the first and second advance control integration capacitors and the first and second idling control integration capacitors, and a reference voltage for dividing the reference voltage to generate a constant reference voltage A generation circuit, a first advance control integration voltage obtained at both ends of a first advance control integration capacitor, and a second advance control integration voltage obtained at both ends of a second advance control integration capacitor.
An advanced ignition timing for outputting an advanced ignition timing signal when the first advanced control integrated voltage exceeds the second advanced control integrated voltage by comparing the advanced ignition integrated voltage with the integrated advanced control voltage. An arithmetic circuit;
The first integrated voltage for idling control obtained at both ends of the first integration capacitor for idling control is compared with the reference voltage, and when the first integrated voltage for idling control is lower and higher than the reference voltage, respectively. A first idling control comparator for generating a first control signal having a first state and a second state is provided across a first idling control integrated voltage and a second idling control integrating capacitor. A first state and a second state are respectively taken when the first idling control integrated voltage is higher and lower than the second idling control integrated voltage by comparing the second idling control integrated voltage. A second idling control comparator for generating a second control signal, when both the first control signal and the second control signal are in the first state. An idling ignition position calculating circuit for outputting an idling ignition position signal, and a starting ignition position for receiving a second signal and outputting a starting ignition position signal when the second signal reaches a threshold level. A signal generation circuit; and an ignition signal supply circuit for supplying an ignition signal to the ignition circuit when any one of the advance ignition position signal, the idling ignition position signal, and the starting ignition position signal is generated.

In the present invention, the magnitude of the reference voltage is set so that the maximum value of the first integrated voltage for idling control becomes lower than the reference voltage when the rotational speed of the internal combustion engine reaches the idling rotational speed. The first rotation angle position at which the first idling control integrated voltage and the second idling control integrated voltage become equal to each other becomes equal to the idling ignition position advanced from the minimum advance position.
And constants of the second idling control integration circuit. Further, when the rotation speed of the internal combustion engine reaches an advance start rotation speed set higher than the idling rotation speed, the first advance control integrated voltage is changed to the second advance control integration at the ignition position for idling. First and second so as to exceed the voltage
The constant of the integration circuit for advance angle control is set.

[0020]

In the above configuration, the method of calculating the ignition position in the advanced ignition timing calculation circuit is the same as that conventionally known, and the advanced ignition timing signal obtained by the advanced ignition timing calculation circuit is used. The occurrence position of the is advanced as the engine speed increases. The starting ignition position signal generation circuit generates a starting ignition position signal when the second signal reaches a threshold level at the minimum advance position. Thus, the point where the ignition position at the time of starting is set to the position where the second signal is generated is also the same as the conventional ignition device.

According to the present invention, an ignition timing ignition position signal for generating an ignition timing ignition position signal when the engine speed reaches the idling rotation speed, in addition to the advance ignition timing ignition position calculating circuit and the starting ignition timing signal generation circuit. An arithmetic circuit is provided to supply an ignition signal to the ignition circuit when any of the advance ignition position signal, the idling ignition position signal, and the starting ignition position signal is generated.

In the ignition position calculating circuit at the time of idling used in the present invention, when the engine speed is lower than the idling speed, the time for charging the first idling control integration capacitor is long, and both ends of the integration capacitor are charged. Since the first integrated voltage for idling control obtained is higher than the reference voltage, the first control signal output from the first comparator for idling control at the minimum advance position is in the second state (for example, low level or zero). Level). Therefore, in this state, the ignition position calculation circuit at the time of idling does not generate the ignition signal for idling, and the ignition signal is supplied to the ignition circuit when the ignition position signal at the start is generated at the minimum advance position.

When the number of revolutions increases after the engine is started, the time for charging the first idling control integration capacitor becomes shorter, so that the maximum value of the first idling control integration voltage becomes lower. It is becoming. When the engine speed reaches the idling speed, the first idling control integrated voltage is always lower than the reference voltage (it cannot exceed the reference voltage even if it reaches the minimum advance position). The first control signal output from the first idling control comparator at the minimum advance position is in a first state (for example, a high level state). In this state, when the first integrated voltage for idling control reaches the second integrated voltage for idling control at a position before the minimum advance position and the second control signal is in the first state, the idling time is set. An ignition position signal is generated, and the ignition position signal provides an ignition signal to an ignition circuit. Therefore, in a low speed region from the idling rotation speed to the advance angle start rotation speed, the ignition operation is performed at the ignition position at the time of idling.

In general, when comparing two integrated voltages rising from a zero level with a constant time constant, the position where the two integrated voltages coincide is determined irrespective of the engine speed. Therefore, the position where the first idling control integrated voltage and the second idling control integrated voltage coincide (the position where the ignition position signal is generated at the time of idling) is always constant, and the position at the time of idling is increased with the increase of the rotation speed. The position where the fire position signal is generated does not advance. The position where the first idling control integrated voltage and the second idling control integrated voltage match is appropriately adjusted by changing one or both constants of the first and second idling control integrated voltages. can do.

According to the present invention, as shown in FIG. 4, the ignition is performed at the minimum advance position θo in the region where the rotation speed is equal to or more than the start rotation speed No and less than the idling rotation speed Ni, and the advance rotation is started at the idling rotation speed Ni or more. In the region less than the number N1, ignition is performed at the ignition position θi at the time of idling, and the advance start rotation speed N
The ignition position is θi in the range of 1 or more and the advance end rotation speed N2 or less.
From θ to θ1. Therefore, by appropriately setting the minimum advance position θo, the ignition position at the time of starting can be set to a position where no kicking occurs.
Further, by adjusting the constants of the first and second idling control integration circuits, the ignition position θi during idling can be appropriately adjusted without changing the configuration of the rotor of the signal generator.

[0026]

FIG. 1 shows an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes an ignition circuit for generating a high voltage for ignition when an ignition signal Vf is applied, and 2 denotes an ignition position of an internal combustion engine. An ignition position control circuit for giving an ignition signal Vf to the ignition circuit 1
Reference numeral 3 denotes an exciter coil as an ignition power supply. The exciter coil 3 is provided in a magnet generator attached to the internal combustion engine, and induces positive and negative half-cycle AC voltages Ve1 and Ve2 in synchronization with rotation of the engine. The output voltage Ve1 of the positive half cycle of the exciter coil is input to the ignition circuit 1, and the voltage Ve2 of the negative half cycle is input to the power supply circuit 4. Connected between one end of the exciter coil 3 and the ground is a diode D1 which forms a return path for the current flowing from the exciter coil to the power supply circuit 4. The power supply circuit 4 includes, for example, a circuit for charging the power supply capacitor to one polarity with the voltage Ve2 of the negative half cycle generated by the exciter coil 3, and a constant voltage circuit for maintaining the voltage across the power supply capacitor at a constant value. And outputs a constant DC voltage Vcc to its output terminal. The output voltage of the power supply circuit 4 is applied to power supply terminals of each part of the ignition position control circuit 2.

The ignition circuit 1 conducts when an ignition signal Vf is applied to the ignition coil IG, the ignition energy storage capacitor C1 provided on the primary side of the ignition coil, and conducts the charge of the capacitor C1 to the ignition coil. A discharge control thyristor Th1 for discharging the primary coil W1 and an ignition energy storage capacitor C using the output voltage of one half cycle of the exciter coil 3 (the output voltage of the positive half cycle in this example).
And a capacitor charging circuit for charging 1 to one polarity.

More specifically, the ignition coil IG
Has a primary coil W1 and a secondary coil W2,
One ends of both coils are grounded, and one end of an ignition energy storage capacitor C1 is connected to a non-ground side terminal of the primary coil W1. The other end of the capacitor C1 is connected to one end of the exciter coil 3 through a diode D2 whose cathode is directed toward the capacitor, and a discharge control thyristor Th1 is connected between the connection point of the diode D2 and the capacitor C1 and ground.
Are connected with their cathodes facing the ground side. A diode D3 whose cathode is directed to the ground is connected to both ends of the primary coil W1 of the ignition coil IG, and a diode D4 whose anode is directed to the ground is connected between the other end of the exciter coil 3 and the ground. I have. In this example,
The exciter coil 3 → diode D2 → ignition energy storage capacitor C1 → diode D3 and ignition coil primary coil W1 → diode D4 circuit charges the capacitor C1 to one polarity with the output voltage of one half cycle of the exciter coil 3. A capacitor charging circuit is configured.

In the illustrated example, a protection resistor R1 is connected to both ends of the thyristor Th1, and a protection resistor R2 and a capacitor C2 are connected in parallel between the gate and cathode of the thyristor Th1.

In the above ignition circuit 1, when the exciter coil 3 generates the voltage Ve1 of a positive half cycle, the ignition energy storage capacitor C1 is charged to the polarity shown in the figure through the capacitor charging circuit. When the ignition signal Vf is applied to the gate of the thyristor Th1 from the ignition position control circuit 2 described later, the thyristor Th1 conducts, and the electric charge of the capacitor C1 is discharged through the thyristor Th1 and the primary coil W1 of the ignition coil. As a result, a large magnetic flux change occurs in the iron core of the ignition coil, so that a high voltage for ignition is induced in the secondary coil W2 of the ignition coil. Since this high voltage is applied to a spark plug P attached to a cylinder of the engine, a spark is generated in the spark plug and the engine is ignited.

The ignition position control circuit 2 is mounted on the internal combustion engine and generates a first signal Vs1 and a second signal Vs2 which reach threshold levels at the maximum advance position and the minimum advance position of the internal combustion engine, respectively. A first signal shaping circuit 202 for shaping the first signal Vs1 into a pulse waveform; a second waveform shaping circuit 203 for shaping the second signal Vs2 into a pulse waveform; A rectangular wave-shaped reference voltage Vq in a section from a position where the first signal Vs1 reaches the threshold level to a position where the second signal Vs2 reaches the threshold level
, A first advancing control integration circuit 205, and a second advancing control integration circuit 206
A first idling control integration circuit 207;
Control circuit 208, a reset circuit 209, a reference voltage generation circuit 210, an advance ignition timing operation circuit 211, and an idling ignition timing operation circuit 2
12, an ignition position signal generation circuit 213 at the start, and an ignition signal supply circuit 214.

More specifically, the signal generator 201 of the present embodiment has a minimum advance position θo suitable for the ignition position at the time of starting.
Polar angle α corresponding to the angle width from to the maximum advance position θ1
And a signal generator that detects a change in magnetic flux given by the rotor and generates a signal. Here, the polar arc angle α is set to be larger than the advance angle width β in the advance angle region.

The signal generator is composed of, for example, an iron core having a magnetic pole portion opposed to the rotor, a signal coil Ls wound around the iron core, and a permanent magnet flowing a magnetic flux through the iron core. The rotor is mounted such that the reluctor of the rotor starts to face the magnetic pole portion of the iron core at the angular position, and ends at the minimum advance position with respect to the magnetic pole portion of the iron core. In this signal generator, the first signal Vs1 and the second signal Vs2 are applied to the signal coil Ls by a change in magnetic flux generated in the iron core when the rotor of the rotor starts to oppose the magnetic pole portion of the iron core and when the opposition ends. [FIG. 2 (A), FIG.
(A) is induced. 2 and 3 show voltage waveforms at various points in the embodiment of FIG. 1. FIG. 2 shows waveforms at the time of engine start and idling operation, and FIG. 3 shows ignition at an increase in rotation speed. FIG. 4 shows a waveform when an advance operation in which a position is advanced is performed. 2 and 3, the horizontal axis represents the rotation angle θ of the engine. In this example,
The first signal Vs1 is a negative signal, and the second signal Vs1 is a negative signal.
s2 is a signal of positive polarity.

Instead of the signal coil, a signal generator for obtaining a first signal and a second signal by detecting a change in magnetic flux generated by a reluctor using a magnetic detecting element such as a Hall IC may be used. it can.

One end of the signal coil 201 is grounded, and a noise absorbing resistor R3 and a capacitor C3 are connected in parallel to both ends of the signal coil.

The first waveform shaping circuit 202 includes a diode D5 having a cathode connected to a non-ground side terminal of the signal coil 201, an NPN transistor TR1 having an emitter connected to the anode of the diode D5, and a transistor TR1.
1 whose base is connected to the collector of
An NP transistor TR2; a resistor R4 connected between the base and the emitter of the transistor TR1;
A parallel circuit of a resistor R5 and a capacitor C3 connected between the base ground of R1 and a resistor R6 and a capacitor C4 connected in parallel between the base and emitter of the transistor TR2.
It is composed of In this waveform shaping circuit, when a first signal Vs1 of negative polarity is generated from the signal coil Ls, a pulse-like base current flows through the transistor TR1 through a parallel circuit of the resistor R5 and the capacitor C3. As a result, the transistors TR1 and TR2 conduct for a short time, so that the first pulse signal is output between the emitter and the collector of the transistor TR2.

The second waveform shaping circuit 203 comprises a circuit in which a diode D6 is connected in series to a parallel circuit of a capacitor C5 and a resistor R7. This waveform shaping circuit applies a second signal Vs2 of positive polarity to both ends of the capacitor C5. , The second pulse signal is output through the diode D6.

The reference voltage generation circuit 204 is composed of a flip-flop circuit F to which the power supply voltage Vcc is supplied from the power supply circuit 4, and a first pulse signal obtained from the first waveform shaping circuit 202 is supplied to an input terminal thereof. ing. The input terminal of the flip-flop circuit F is connected to the collector of an NPN transistor TR3 constituting a switching element of a reset circuit described later, and the emitter of the transistor TR3 is grounded. The base of the transistor TR3 is connected to the output terminal (cathode of the diode D6) of the waveform shaping circuit 203 through a resistor R8, and a resistor R9 and a capacitor C6 are connected in parallel between the base and the emitter of the transistor TR3.

In this example, when the signal coil Ls generates the first signal Vs1 and the transistor Tr2 is turned on, the potential of the input terminal of the flip-flop circuit F changes to a high level. , The potential of the output terminal Q of the flip-flop circuit F becomes high. When the signal coil Ls generates the second signal Vs2 and the waveform shaping circuit 203 generates a pulse signal, the transistor TR
3 is turned on, and the potential of the input terminal of the flip-flop circuit F is set to zero level (ground potential). The change in the potential of the input terminal inverts the potential of the output terminal Q of the flip-flop circuit F (to a zero level).

Therefore, the reference voltage generating circuit 204
As shown in FIG. 3B and FIG. 3B, the first signal Vs1
From the position (maximum advance position) .theta.1 at which the signal reaches the threshold level to the position (minimum advance position) .theta.o at which the second signal Vs2 reaches the threshold level.

The first advancing control integration circuit 205 is an NPN transistor TR4 having a collector connected to the output terminal of the flip-flop circuit F (reference voltage generation circuit 204).
Resistors R10 and R11 connected between the collector and base of the transistor TR4 and the base ground; a first advancing control integration capacitor Ca1 connected between the emitter of the transistor TR4 and ground; and a transistor TR4.
And a resistor R12 connected between the collector and the emitter of the transistor. The non-ground side terminal of the integrating capacitor Ca1 is connected to the collector of the transistor TR3 through the diode D7.

In the integration circuit 205, when the reference voltage Vq is generated at the maximum advancing position θ1, the first advancing control integration capacitor Ca1 passes between the collector and the emitter of the transistor TR4 to pass the reference voltage Vq to the resistor R10. And the voltage Vq1 divided by R11 is instantaneously charged. When the capacitor Ca1 is charged to the voltage Vq1, the transistor TR
4, the base current stops flowing and the transistor is turned off, so that the integrating capacitor Ca1 is additionally charged with a constant time constant through the resistor R12 by the reference voltage Vq. When the second signal Vs2 is generated at the minimum advance position θo, the transistor TR3 is turned on, so that the electric charge of the integrating capacitor Ca1 is discharged instantaneously through the diode D7 and the transistor TR3, and the integrating capacitor Ca1 is reset. Therefore, as shown in FIG. 2 (F) and FIG. 3 (F), both ends of the first advance control integration capacitor Ca1 instantaneously rise to a constant voltage Vq1 at the maximum advance position θ1. After that, a first advance control integrated voltage Va1 having a waveform rising with a constant slope to the minimum advance position θo is obtained.

The second advance control integration circuit 206 includes a resistor R13 having one end connected to the output terminal of the power supply circuit 4, and a second lead angle control integrated circuit connected between the other end of the resistor R13 and the ground. The second lead angle control integration capacitor Ca2 is charged with a constant time constant through the resistor R13 by the power supply voltage Vcc. The non-ground terminal of the integrating capacitor Ca2 is connected to the collector of the transistor TR3 through the diode D8. Therefore, both ends of the second advancing control integration capacitor Ca1 are shown in FIG.
As shown in (F), a second advance control integrated voltage Va2 having a waveform rising from each minimum advance position θo with a constant time constant and returning to zero at the next minimum advance position θo is obtained. .

First idling control integration circuit 207
Comprises a resistor R14 having one end connected to the output terminal of the reference voltage generating circuit 204, and a first idling control integration capacitor Ci1 connected between the other end of the resistor R14 and ground. The non-ground side terminal of the integrating capacitor Ci1 is connected through a diode D7 'to the collector of an NPN transistor TR3' whose emitter is grounded, and the transistor T3
The base of R3 'is connected to the output terminal of the waveform shaping circuit 203 through a resistor R8'. A resistor R9 'and a capacitor C6' are connected in parallel between the base and the emitter of the transistor TR3 '.

The first integration capacitor for idling control Ci1 is charged with a constant time constant through the resistor R14 by the reference voltage Vq. At the minimum advance position θo, the second signal Vs2
Occurs (reaches the threshold level) and the transistor T
When R3 'conducts, the charge of the integrating capacitor Ci1 is discharged instantaneously through the diode D7' and the transistor TR3 '. Therefore, as shown in FIGS. 2 (C) and 3 (C), both ends of the first idling control integration capacitor Ci1 rise from the maximum advance position .theta.1 with a predetermined inclination and then reach the minimum advance position .theta.o. As a result, a first idling control integrated voltage Vi1 having a waveform returning to zero is obtained.

Second idling control integration circuit 208
Is a resistor R15 having one end connected to the output terminal of the power supply circuit 4.
And a second idling control integration capacitor Ci2 connected between the other end of the resistor R15 and ground.
The non-ground side terminal of the second idling control integration capacitor Ci2 is connected to the transistor TR3 'through a diode D8'.
Connected to the collector.

The second idling control integration capacitor Ci2 is charged with a constant time constant through a resistor R15 by a constant power supply voltage Vcc. When the second signal Vs2 is generated at the minimum advance position θo, the transistor TR3 'is turned on, so that the electric charge of the integrating capacitor Ci2 is discharged instantaneously through the diode D8' and the transistor TR3 '. Therefore, as shown in FIGS. 2 (D) and 3 (D), both ends of the second idling control integration capacitor Ci2 rise from the minimum advance position θo at a predetermined inclination and then reach the next minimum advance. The second advance control integrated voltage Vi2 having a waveform returning to zero at the position θo
Is obtained.

The reference voltage generation circuit 210 comprises a series circuit of resistors R16 and R17 connected between the output terminals of the reference voltage generation circuit 204. This circuit divides the reference voltage Vq to generate the reference voltage Vr. Occurs.

In this example, the transistor TR3 and the resistor R
8, R9, capacitor C6 and diodes D7, D8
And a transistor TR3 ', resistors R8' and R9 ', a capacitor C6', and diodes D7 'and D8'.
A reset circuit for instantaneously discharging the first and second advance control integration capacitors Ca1 and Ca2 and the first and second idling control integration capacitors Ci1 and Ci2 when s2 reaches the threshold level. 209 are constituted.

The advanced ignition timing calculation circuit 211 comprises a comparator CP1 and a resistor R18 connected between the output terminal of the comparator and the output terminal of the power supply circuit 4, and the non-inverting input of the comparator CP1. Terminal (+ terminal) and inverted input terminal (-terminal)
Are respectively supplied with a first advance control integral voltage Va1 and a second advance control integral voltage Va2.

In this advanced ignition timing calculation circuit,
A first advancing control integration voltage Va1 obtained at both ends of a first advancing control integration capacitor Ca1, and a second advancing control integration voltage obtained at both ends of a second advancing control integration capacitor Ca2. The ignition timing calculation circuit 212 that outputs the ignition timing signal Vf1 when the first integrated voltage Va1 for comparison with Va2 exceeds the second integrated voltage Va2 for advanced control. , The first idling control integration voltage Vi1
And a reference voltage Vr input to the inverting input terminal and the non-inverting input terminal respectively.
P2 and a second idling control comparator CP3 to which a first idling control integrated voltage Vi1 and a second idling control integrated voltage Vi2 are input to a non-inverting input terminal and an inverting input terminal, respectively. The output terminals of the comparators CP2 and CP3 are commonly connected and connected to the output terminal of the power supply circuit 4 via a resistor R19.

The first idling control comparator CP2
The first state (state of high level in this example) and the second state (state of zero level in this example) when the first idling control integrated voltage Vi1 is lower and higher than the reference voltage Vr, respectively. ) Is generated. Also, the second idling control comparator CP3
When the first idling control integration voltage Vi1 is higher and lower than the second idling control integration voltage Vi2, the first state (high-level state) and the second state (zero-level state) are respectively set. A second control signal e2 is generated. The ignition position calculation circuit 212 at the time of idling
When both the control signal e1 and the second control signal e2 are in the first state (high-level state), the ignition position ignition position signal Vf2 is output.

The advance ignition position signal Vf1 and the idling ignition position signal Vf2 are supplied to the gate of the thyristor Th1 of the ignition circuit 1 through diodes D10 and D11, respectively.

The starting ignition position signal generating circuit 213 comprises a diode D9 having an anode connected to the anode of the diode D6 of the waveform shaping circuit 203, and a resistor R20 having one end connected to the cathode of the diode.
Is connected to the gate of the thyristor Th1 of the ignition circuit 1. The ignition position signal generation circuit 213 at the time of starting
When the second signal Vs2 reaches the threshold level, the ignition timing signal Vf3 is supplied to the gate of the thyristor Th1.

By the diodes D10 and D11 and a circuit connecting the output terminal of the starting position ignition position signal supply circuit 213 to the gate of the thyristor Th1, the advance position ignition position signal V
An ignition signal supply circuit 214 is provided for supplying the ignition signal Vf to the ignition circuit 1 when any of f1, the ignition position signal Vf2 at the time of idling, and the ignition position signal Vf3 at the time of starting is generated.

In this embodiment, the magnitude of the reference voltage Vr is set so that the maximum value of the first idling control integrated voltage Vi1 becomes lower than the reference voltage Vr when the rotation speed of the internal combustion engine reaches the idling speed Ni. Is set, and the rotational angle position where the first idling control integrated voltage Vi1 and the second idling control integrated voltage Vi2 are equal becomes equal to the idling ignition position advanced from the minimum advanced position. , Constants of the first and second idling control integration circuits 207 and 208 are set. Further, when the rotation speed of the internal combustion engine reaches the advance start rotation speed set higher than the idling rotation speed, the first advance control integrated voltage Va1 is changed to the second advance control at the idling ignition position. The constants of the first and second advance angle control integration circuits 205 and 206 are set so as to exceed the integration voltage Va2.

In the above embodiment, when the engine is started, the ignition position calculation circuit 211 and the ignition position calculation circuit 212 at the time of idling do not generate the ignition position signals Vf1 and Vf2. 2 signal Vs2 reaches the threshold level and the signal coil Ls outputs the waveform shaping circuit 203 and the starting ignition position signal generation circuit 2
When the starting position ignition position signal Vf3 is output through 13, the ignition position signal Vf3 is given to the gate of the discharge control thyristor Th1 of the ignition circuit 1 as the ignition signal Vf.
Therefore, the ignition position at the start of the engine is the minimum advance position θo, and by setting this minimum advance position θo to a suitable position at the time of start, the occurrence of kicking can be prevented.
The engine can be started.

When the engine is started and the output of the power supply circuit 4 is established, the flip-flop circuit 204 and each of the integrating circuits normally start operating, and as shown in FIGS. 2 (C) and 2 (D). First and second idling control integrated voltages V
i1 and Vi2 are generated, and as shown in FIG.
And the second advance control integrated voltages Va1 and Va2 are generated. While the engine speed is lower than the advance start rotation speed N1, the first advance control integration voltage Va1 exceeds the second advance control integration voltage Va2 as shown in FIG. 2 (Va1 and Va2 cannot cross), so FIG.
As shown in (G), the ignition position arithmetic circuit 211 at the time of advancement
Cannot output the ignition position signal Vf1.

The first idling control integrated voltage V
i1 is equal to or higher than the second integrated voltage for idling control Vi2 at a position θi advanced from the minimum advance position θo.
At the position i, the second idling control comparator CP3 outputs a high-level control signal e2.

When the rotational speed N is lower than the idling rotational speed Ni, as shown in FIG. 2C, the second idling control comparator CP3 outputs the high level control signal e2.
Is output, the first integrated voltage for idling control Vi1
Is higher than the reference voltage Vr, and the comparator CP2
Is at a zero level. Therefore, in the region where the rotational speed is lower than the idling rotational speed Ni, even when the comparator CP3 generates the high-level control signal e2, the idling ignition position calculation circuit 212 outputs the idling ignition position signal Vf2. And the ignition operation is performed at the minimum advance position θo.

When the rotational speed N becomes equal to or higher than the idling rotational speed Ni, the first idling control integrated voltage Vi1 is always lower than the reference voltage Vr, as shown by the two-dot chain line in FIG. 2C. Therefore, the control signal output from the comparator CP2 is always at a high level. Accordingly, when the rotational speed N becomes equal to or higher than the idling rotational speed Ni, the comparator CP3 generates a high-level control signal e2 at the position of θi and, at the same time, generates the idling ignition position signal Vf2 as shown in FIG. The ignition position signal Vf2 is the ignition signal Vf
[FIG. 2 (H)] is given to the gate of the thyristor Th1. Therefore, in the region where the idling rotational speed is equal to or more than Ni and less than the advance angle starting rotational speed N1, the ignition operation is performed at the position θi where the ignition position ignition position signal Vf2 is generated.

In general, when comparing two integrated voltages Vi1 and Vi2 rising from zero volt with a constant time constant, the position where the two integrated voltages are equal becomes constant irrespective of the engine speed. Is always constant. The ignition position θi during idling is
The adjustment can be made as appropriate by changing the constants of the first and second idling control integration circuits 207 and 208.

When the rotational speed of the engine reaches the advance start rotational speed N1, as shown in FIG. 3F, the first advance control integrated voltage Va1 is changed to the second at the ignition position θi during idling. The comparator CP1 generates the advanced ignition timing signal Vf1 exceeding the advanced control integrated voltage Va2, and the advanced ignition timing signal Vf1 is supplied to the gate of the thyristor Th1 as the ignition signal Vf. Become. First advance control integral voltage V
The position at which a1 exceeds the second advance control integrated voltage Va2 (the position at which the ignition position ignition position signal Vf1 is generated) advances as the rotation speed increases, so that the advance start rotation speed N1 In the above region, the ignition position is advanced with an increase in the rotation speed.

When the ignition position is advanced to the maximum advance position θ1 after reaching the advance end rotation speed N2, the advance operation stops, and in the region exceeding the advance end rotation speed N2, the ignition position becomes the maximum advance position θ1. Fixed.

Therefore, according to the above embodiment, as shown in FIG. 4, in the region where the engine speed is equal to or more than the starting rotational speed No and less than the idling rotational speed Ni, ignition is performed at the minimum advance position θo, and the advanced angle is equal to or more than the idling rotational speed Ni. In the region where the rotation speed is less than the start rotation speed N1, the ignition is performed at the ignition position θi during idling, and in the region where the advance rotation speed N1 is equal to or more than the advance rotation end speed N2, the ignition position is advanced from θi to θ1. Can be Therefore, by appropriately setting the minimum advance position θo, the ignition position at the time of starting can be set to a position where no kicking occurs. By adjusting the constants of the first and second idling control integration circuits 207 and 208, the ignition position θi during idling can be appropriately adjusted without changing the configuration of the rotor of the signal generator 201. it can.

In the above embodiment, the transistors TR3,
Resistors R8 and R9, capacitor C6 and diode D7,
D8, transistor TR3 ', resistors R8' and R9 ', capacitor C6' and diodes D7 'and D8', the first and second advance angles when the second signal Vs2 reaches the threshold level. A reset circuit 209 for instantaneously discharging the control integration capacitors Ca1 and Ca2 and the first and second idling control integration capacitors Ci1 and Ci2 is configured.
One of the integration capacitors Ca1, Ca2, Ci1, and Ci2 may be reset by one transistor TR3.

In the above embodiment, a capacitor discharge type circuit is used as the ignition circuit 1, but the present invention can be applied to a case where a current interruption type ignition circuit is used.

[0068]

As described above, according to the present invention, an advanced ignition timing operation circuit for generating an advanced ignition timing signal having a characteristic that the generated position is advanced with an increase in the rotational speed, and In addition to the starting-point ignition position signal generation circuit that generates the starting-point ignition position signal at the advanced position, an idling-point ignition position calculation circuit that generates an idling-point ignition position signal when the engine speed reaches the idling rotation number is provided. Since the ignition signal is provided to the ignition circuit when any of the advance ignition position signal, the idling ignition position signal, or the start ignition position signal is generated, the starting rotation speed is equal to or more than the starting rotation speed and less than the idling rotation speed. In the region, the ignition is performed at the minimum advance position, and in the region that is equal to or more than the idling rotational speed and less than the advance start rotational speed, the ignition is performed at the ignition position at the time of idling, and the ignition is advanced more than the advance rotational speed. It can be ignited position finish rotational speed following areas to obtain the property of advancing the ignition position during idling to the maximum advance position. Accordingly, by appropriately setting the minimum advance position, the ignition position at the time of starting can be set to a position where no kick occurs, and safety can be improved.

According to the present invention, by adjusting the constants of the first and second idling control integration circuits,
Since the ignition position at the time of idling can be appropriately adjusted without changing the configuration of the rotor of the signal generator, the cost required for changing the characteristics can be reduced,
There is an advantage that an ignition device having characteristics meeting the requirements of the engine can be provided at low cost.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing an embodiment of the present invention.

FIG. 2 is a waveform diagram showing voltage waveforms at various parts in FIG. 1 in a rotation range lower than an advance start rotation speed.

FIG. 3 is a waveform diagram showing voltage waveforms of respective parts in FIG. 1 in a rotation region higher than an advance start rotation speed.

FIG. 4 is a diagram showing an example of ignition characteristics obtained by an embodiment of the present invention.

FIG. 5 is a diagram showing ignition characteristics obtained by a conventional ignition device for an internal combustion engine.

[Explanation of symbols]

 Reference Signs List 1 ignition circuit 2 ignition position control circuit 201 signal generator 202 waveform shaping circuit 203 waveform shaping circuit 204 reference voltage generating circuit 205 first advance angle control integration circuit 206 second advance angle control integration circuit 207 first idling Integrating circuit for control 208 Second integrating circuit for idling control 209 Reset circuit 211 Advanced ignition timing arithmetic circuit 212 Advanced ignition timing arithmetic circuit

Claims (1)

(57) [Claims] An internal combustion engine comprising: an ignition circuit for generating a high voltage for ignition when an ignition signal is applied; and an ignition position control circuit for applying an ignition signal to the ignition circuit at an ignition position of the internal combustion engine. In the ignition device, the ignition position control circuit includes: a signal generation device that generates a first signal and a second signal that reach threshold levels at a maximum advance position and a minimum advance position of the internal combustion engine, respectively; The second from the position where the signal of 1 reaches the threshold level
A reference voltage generating circuit for generating a reference voltage having a rectangular waveform in a section up to a position where the signal reaches a threshold level; A first lead angle control integration circuit for performing an integration operation of charging the battery instantaneously and then additionally charging with a predetermined time constant, and a second integration operation for charging a second lead angle control integration capacitor with a predetermined time constant. An advancing control integration circuit, a first idling control integration circuit performing an integration operation of charging a first idling control integration capacitor with a predetermined time constant by the reference voltage, and a second idling control integration circuit. A second idling control integration circuit for performing an integration operation for charging an integration capacitor with a predetermined time constant; and the first and second advance angle control when the second signal reaches a threshold level. Integrating capacitors and the first and second
A reset circuit for instantaneously discharging the idling control integration capacitor; a reference voltage generation circuit for dividing the reference voltage to generate a constant reference voltage; The first advanced control integrated voltage is compared with a second advanced control integrated voltage obtained at both ends of the second advanced control integrated capacitor, and the first advanced control integrated voltage is compared with the second integrated voltage. An advanced ignition timing position calculating circuit for outputting an advanced ignition timing position signal when the second advanced control integration voltage is exceeded; and a first idle control obtained at both ends of the first idle control integration capacitor. A first control signal that takes a first state and a second state when the first idling control integrated voltage is lower and higher than the reference voltage, respectively, by comparing the integrated voltage for use with the reference voltage; First The first idling control comparator compares the first idling control integrated voltage with a second idling control integrated voltage obtained at both ends of the second idling control integrating capacitor. A second idling control comparator for generating a second control signal having a first state and a second state when the integrated voltage is higher and lower than the second idling control integrated voltage, respectively; An idling ignition position calculating circuit for outputting an idling ignition position signal when both the first control signal and the second control signal are in the first state; and A starting-point ignition position signal generating circuit for outputting a starting-point ignition position signal when the second signal reaches a threshold level; An ignition signal supply circuit for providing an ignition signal to the ignition circuit when either the ignition position signal or the ignition position signal at the time of starting is generated, wherein when the rotation speed of the internal combustion engine reaches an idling rotation speed, The magnitude of the reference voltage is set such that the maximum value of the first integrated voltage for idling control is lower than the reference voltage. The first integrated voltage for idling control and the second integrated voltage for idling control are different from each other. The constants of the first and second idling control integration circuits are set such that the equal rotational angle position becomes equal to the idling ignition position advanced from the minimum advance position. When the advanced rotation start speed set higher than the idling rotation speed is reached, the first advanced control integrated voltage becomes the second advanced angle at the idling ignition position. It ignition device for an internal combustion engine characterized by the constants of the first and second lead angle control for the integrating circuit is set to exceed the patronage integrated voltage.