JPH0886264A - Ignition device for internal combustion engine - Google Patents

Abstract

PURPOSE: To set an ignition position during the starting of an engine and idling thereof to an optimum position. CONSTITUTION: A computing circuit 212 for an ignition position during idling to compute an ignition position during idling is arranged outside a computing circuit 211 for an ignition position during spark advance to compute an ignition position at a spark advance region. The computing circuit 212 for an ignition position during idling comprises a first comparator CP2 to compare a first integrating voltage Vil with a reference voltage Vr and generate a high level output when a first integrating voltage is below a reference voltage; and a second comparator CP3 to compare the first integrating voltage Vi1 with a second integrating voltage Vi2 and generate a high level output when the two integrating voltages are rendered equal to each other. When the outputs of the first and second comparators CP1 and CP2 are both increased to a high level, an ignition signal during idling is generated.

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 the ignition position according to the engine speed by performing an ignition operation at the ignition position obtained by integral calculation.

[0002]

2. Description of the Related Art An ignition device for an internal combustion engine includes an ignition circuit for generating a high voltage for ignition when an ignition signal is given,
And an ignition position control circuit for giving an ignition signal to the ignition circuit at the ignition position of the internal combustion engine.

The ignition circuit is composed of an ignition coil and a primary current control circuit which causes a rapid change in the primary current of the ignition coil when an ignition signal is applied. As the ignition circuit, a capacitor discharge type circuit and a current interruption type circuit are known.

In the capacitor discharge type ignition circuit, the output of an exciter coil provided on the primary side of the ignition coil and provided in the magnet generator, or the output of a converter circuit for boosting the voltage of the battery is provided before the ignition position. By the ignition energy storage capacitor that is charged to one polarity in the interval and the discharge control thyristor that conducts when the ignition signal is given and discharges the charge of the ignition energy storage capacitor to the primary coil of the ignition coil. , A primary current control circuit is configured. In this type of ignition circuit, the charge of the capacitor is discharged to cause a rapid change in the primary current of the ignition coil to induce a high voltage for ignition in the secondary coil of the ignition coil.

Further, 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 with a primary coil of an ignition coil. In this ignition circuit, the primary current control switch, which has been conducted at a position prior to the ignition position, is turned off at the ignition position so that the primary coil and the primary current control switch are made to flow from the battery. Then, the current is cut off to induce a high voltage for ignition 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 has a rectangular wave drive signal (the primary current control switch is made conductive at a position before the ignition position). Signal for control), and 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 in which the primary coil of the ignition coil provided in the magnet generator is used as a power source for ignition, the primary current is controlled by a primary current control switch provided in parallel with the primary coil of the ignition coil. A current control circuit is configured. In this type of ignition circuit, when a voltage of one polarity is induced in the primary coil of the ignition coil, the primary current control switch is turned on, 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 making the cut-off state.

Regardless of which type of ignition circuit is used, the position where the ignition signal is applied to the ignition circuit is the ignition position. The ignition position control circuit changes the generation position of the ignition signal so that the ignition position is advanced or retarded according to the engine speed, at least with the engine speed as a control condition.

Various types of ignition position control circuits are known, one of which is to calculate the ignition position by integral calculation and generate an ignition signal at the calculated ignition position. A known electronic lead angle type circuit is known. In this kind of ignition position control circuit, a signal generator rotating in synchronization with the engine generates first and second signals at the maximum advance position and the minimum advance position of the engine, respectively, and outputs the first and second signals. Thus, the ignition position is obtained by comparing and calculating a plurality of integrated voltages obtained by defining an integral section and performing integral calculation.

The signal generator is composed of, for example, a rotor provided with a reluctor having a polar arc angle equal to the advance width, and a signal generator for detecting a magnetic flux change given by the rotor and generating a signal. . The signal generating electron is composed of, 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 that causes a magnetic flux to flow through the iron core. The rotor is attached such that the reluctor 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 reluctor of the rotor starts to face the magnetic pole portion of the iron core and when the facing ends. In some cases, instead of the signal coil, a magnetic detection element such as a Hall IC is used to detect a change in magnetic flux caused by the reluctor.

[0011]

As an ignition device using an electronic advance type ignition position control circuit, it is practically fair 3-199.
Although various types have been proposed as seen in 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 broken line A in FIG. The ignition position is fixed at the minimum advance angle position θo in the rotation range from the starting rotation speed No to the advance start rotation speed N1 and the ignition position is advanced to the maximum in the range over the advance start rotation speed N1. After advancing to the angular position θ1, the ignition position is the maximum advancing position θ1 in the region where the advancing end rotation number N2 is exceeded.
A property that is fixed to is obtained.

When the ignition position is fixed at the minimum advance angle position in the rotation range of the advance angle start revolution speed N1 or less, the minimum advance angle position θo is set to a position suitable for operation at the idling revolution speed Ni. Then, when the engine is started, the ignition position advances too much, so that a phenomenon in which the piston of the engine is pushed back (so-called Ketchin) at the time of the starting operation may occur, which may be harmful to the driver.

In order to prevent the occurrence of ketching, the minimum advance position is set to a position θ suitable for starting as shown by the broken line B in FIG.
It may be possible to set it to o ', but if it is set in this way, the ignition position at the time of idling will be too late, and there will be a problem that the engine stalls easily occur at the time of idling.

As described above, there is a contradictory relationship between the characteristics required at the time of starting and the characteristics required at the time of idling operation. Therefore, in reality, a compromise point between them is found and the minimum advance position is set. However, there is a problem that satisfactory characteristics cannot be obtained both at the time of starting and at the time of idling operation.

In the conventional ignition device, if the minimum advance angle position is changed according to the characteristics required of the engine (for example, the characteristic of the broken line a in FIG. 5 is changed to the characteristic of the broken line b), Since it is necessary to change the polar arc angle (advance width) of the reluctor provided in the rotor of the signal generator, it is unavoidable that the cost required to change the characteristics becomes high.

An object of the present invention is to provide an ignition device for an internal combustion engine capable of setting the ignition position at the time of idling and at the time of starting without changing the configuration of the signal generator. It is in.

[0017]

SUMMARY OF THE INVENTION The present invention is an ignition circuit for generating a high voltage for ignition when an ignition signal is applied,
The present invention relates to an internal combustion engine ignition device including an ignition position control circuit that provides an ignition signal to an ignition circuit at an ignition position of an internal combustion engine.

According to the present invention, the ignition position control circuit generates a first signal and a second signal that reach the threshold level at the maximum advance position and the minimum advance position of the internal combustion engine, respectively. A reference voltage generating circuit for generating a reference voltage having a rectangular waveform in a section from a position where the first signal reaches the threshold level to a position where the second signal reaches the threshold level; and a first advance angle control. A first lead angle control integrating circuit for performing an integral operation of instantly charging the charge integrating capacitor to a constant voltage at a maximum lead angle position with a reference voltage and then additionally charging it with a predetermined time constant, and a second lead angle control. A second advance control integration circuit for performing an integration operation of charging the integration capacitor for use with a predetermined time constant, and a second integration circuit for performing an integration operation of charging the first integration capacitor for idle control with a predetermined time constant using a reference voltage. One eye A ring control integrator circuit, a second idling control integrator circuit for performing an integration operation for charging the second idling control integrator capacitor with a predetermined time constant, and when the second signal reaches a threshold level And a reset circuit for instantaneously discharging the first and second advance control capacitors and the first and second idle control control capacitors, and a reference voltage for dividing the reference voltage to generate a constant reference voltage. A generation circuit, a first advance angle control integrated voltage obtained at both ends of the first advance angle control integration capacitor, and a second obtainable at both ends of the second advance angle control integration capacitor.
Of the advanced angle control position and the first advanced angle control integrated voltage exceeds the second advanced angle control integrated voltage and outputs an advanced point ignition position signal. Arithmetic circuit,
The first idling control integration voltage obtained across the first idling control integration capacitor is compared with the reference voltage to determine whether the first idling control integration voltage is lower or higher than the reference voltage. A first idling control comparator that generates a first control signal that takes one state and a second state, and a first idling control integration voltage and a second idling control integration capacitor. When the first idle control integrated voltage is higher and lower than the second idle control integrated voltage by comparing with the second idle control integrated voltage, the first state and the second state are respectively set. 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. Idling time fire position calculation circuit for outputting idling time fire position signal, and starting time fire position for outputting start time fire position signal when the second signal reaches a threshold level by inputting the second signal A signal generation circuit and an ignition signal supply circuit that gives an ignition signal to the ignition circuit when any of the advance ignition position ignition signal, the idling ignition ignition position signal, and the starting ignition position signal are 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 rotation speed of the internal combustion engine reaches the idling rotation speed. , The first idling control integrated voltage is equal to the second idling control integrated voltage so that the rotation angle position is equal to the ignition position for idling advanced from the minimum advance position.
And the constants of the second idle control integration circuit are set. Further, when the rotation speed of the internal combustion engine reaches the set advance start rotation speed higher than the idling rotation speed, the first advance control integral voltage is applied to the second advance control integral at the ignition position for idling. First and second to exceed voltage
The constant of the integration circuit for the advance angle control of is set.

[0020]

In the above structure, the ignition position calculation method in the advance ignition timing calculation circuit is the same as that conventionally known, and the advance ignition ignition position signal obtained by the advance ignition ignition position calculation circuit is obtained. The generation position of the engine advances as the engine speed increases. The starting fire position signal generating circuit also generates a starting fire position signal when the second signal reaches the threshold level at the minimum advance position. As described above, the ignition position at the time of starting is set to the position at which the second signal is generated, similarly to the conventional ignition device.

According to the present invention, the ignition position ignition position signal for generating an ignition position ignition position signal when the engine speed reaches the idling speed is provided in addition to the advance position ignition position calculation circuit and the starting ignition position signal generation circuit. It is characterized in that an arithmetic circuit is provided to give an ignition signal to the ignition circuit when any one of the advance ignition position ignition signal, the idling ignition position ignition signal and the starting ignition position ignition position signal is generated.

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

When the engine speed is increased after the engine is started, the time for charging the first idling control integration capacitor is shortened, so that the maximum value of the first idling control integration voltage is low. It will become. When the engine speed reaches the idling speed, the first idling control integrated voltage is always lower than the reference voltage (the reference voltage cannot be exceeded even if the minimum advance position is reached). The first control signal output from the first idling control comparator at the minimum advance position is in the first state (for example, high level state). In this state, when the first idling control integrated voltage reaches the second idling control integrated voltage at a position before the minimum advance position and the second control signal becomes the first state, the idling time point is reached. A fire position signal is generated which provides the ignition signal to the ignition circuit. Therefore, in the low speed range from the idling speed to the advance angle starting speed, the ignition operation is performed at the ignition position at idling.

In general, when two integrated voltages rising from a zero level with a constant time constant are compared, the position where the two integrated voltages match is determined regardless of the engine speed. Therefore, the position where the first integrated voltage for idling control and the second integrated voltage for idling control match (the position where the ignition position signal at the idling time is generated) is always constant, and the idling time is increased as the rotation speed increases. The position where the fire position signal is generated does not advance. Further, the position where the first idling control integrated voltage and the second idling control integrated voltage match each other 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, ignition is performed at the minimum advancing position θo in the region where the starting revolution number is equal to or higher than the idling revolution number Ni and the idling revolution number is equal to or more than the advancing start revolution. In the region where the number is less than N1, ignition is performed at the ignition position θi at the time of idling, and the advance angle rotation speed N
The ignition position is θi in the range of 1 or more and the advance end rotation number N2 or less.
The characteristic of advancing from θ1 to θ1 is obtained. Therefore, by appropriately setting the minimum advance angle position θo, the ignition position at the time of starting can be set to a position where no ketching occurs.
Further, by adjusting the constants of the first and second idling control integrating circuits, the ignition position θi at idling can be appropriately adjusted without changing the configuration of the rotor of the signal generator.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of the present invention. In FIG. 1, reference numeral 1 is an ignition circuit for generating a high voltage for ignition when an ignition signal Vf is applied, and 2 is an ignition position of an internal combustion engine. And an ignition position control circuit for giving an ignition signal Vf to the ignition circuit 1,
An exciter coil 3 serves as an ignition power source. 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 the rotation of the engine. The positive half cycle output voltage Ve1 of the exciter coil is input to the ignition circuit 1, and the negative half cycle voltage Ve2 is input to the power supply circuit 4. A diode D1 is connected between one end of the exciter coil 3 and the ground to form a return path for the current flowing from the exciter coil to the power supply circuit 4. The power supply circuit 4 comprises, for example, a circuit for charging the power supply capacitor to one polarity with a negative half-cycle voltage Ve2 generated by the exciter coil 3 and a constant voltage circuit for keeping the voltage across the power supply capacitor at a constant value. However, it outputs a constant DC voltage Vcc to its output terminal. The output voltage of the power supply circuit 4 is applied to the power supply terminal of each part of the ignition position control circuit 2.

The ignition circuit 1 conducts when the ignition coil IG, the ignition energy storage capacitor C1 provided on the primary side of the ignition coil, and the ignition signal Vf are applied, and charges the capacitor C1 to the charge of the ignition coil. Discharge control thyristor Th1 for discharging primary coil W1 and one half cycle output voltage of exciter coil 3 (in this example, positive half cycle output voltage), ignition energy storage capacitor C
It is composed of a capacitor charging circuit that charges 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 the ignition energy storage capacitor C1 is connected to the non-grounded 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 having the cathode directed toward the capacitor, and the discharge control thyristor Th1 is connected between the connection point between the diode D2 and the capacitor C1 and the ground.
Are connected with their cathodes facing the ground side. A diode D3 having a cathode directed to the ground side is connected to both ends of the primary coil W1 of the ignition coil IG, and a diode D4 having an anode directed to the ground side is connected between the other end of the exciter coil 3 and the ground. There is. In this example,
The exciter coil 3 → diode D2 → ignition energy storage capacitor C1 → diode D3 and ignition coil primary coil W1 → diode D4 are used to charge 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 protective resistor R1 is connected to both ends of the thyristor Th1, and a protective resistor R2 and a capacitor C2 are connected in parallel between the gate and cathode of the thyristor Th1.

In the ignition circuit 1 described above, when the exciter coil 3 generates a positive half cycle voltage Ve1, 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 which will be described later, the thyristor Th1 becomes conductive and the electric charge of the capacitor C1 is discharged through the thyristor Th1 and the primary coil W1 of the ignition coil. This causes a large magnetic flux change 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 the spark plug P attached to the cylinder of the engine, a spark is generated in the spark plug to ignite the engine.

The ignition position control circuit 2 is attached to 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 signal generating device 201, a first waveform shaping circuit 202 that shapes the first signal Vs1 into a pulse waveform, a second waveform shaping circuit 203 that shapes the second signal Vs2 into a pulse waveform, Reference voltage Vq having a rectangular waveform in the section from the position where the first signal Vs1 reaches the threshold level to the position where the second signal Vs2 reaches the threshold level.
Of the reference voltage generating circuit 204, the first advancing control integration circuit 205, and the second advancing control integration circuit 206.
A first idling control integration circuit 207;
Idling control integration circuit 208, reset circuit 209, reference voltage generation circuit 210, advance point ignition position calculation circuit 211, idling point ignition position calculation circuit 2
12, an ignition position signal generation circuit 213 at the time of starting, and an ignition signal supply circuit 214.

More specifically, the signal generator 201 according to the present embodiment has a minimum advance position θo suitable for the ignition position at the time of starting.
To the maximum advance angle θ1 Polar arc angle α corresponding to the angular width
And a signal emitting electron that detects a magnetic flux change 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-generating electrons are 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 that causes a magnetic flux to flow through the iron core. The rotor is mounted so that the reluctor of the rotor begins to face the magnetic pole portion of the iron core at the angular position, 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, the first signal Vs1 and the second signal Vs2 are applied to the signal coil Ls due to changes in magnetic flux generated in the iron core when the reluctor of the rotor starts to face the magnetic pole portion of the iron core and when the facing ends, respectively. [FIG. 2 (A), FIG.
(See (A)]. 2 and 3 show voltage waveforms at various portions of the embodiment of FIG. 1, FIG. 2 shows waveforms at the time of starting the engine and at the time of idling operation, and FIG. 3 shows ignition as the rotational speed increases. The waveform is shown when the advance operation for advancing the position 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
s2 consists of a positive polarity signal.

Instead of the signal coil, it is also possible to use a signal generator that obtains the first signal and the second signal by detecting the magnetic flux change caused by the reluctor using a magnetic detection element such as a Hall IC. 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 terminal of the signal coil 201, an NPN transistor TR1 having an emitter connected to an anode of the diode D5, and a transistor TR.
P whose base is connected to the collector of 1 through resistor R3
NP transistor TR2, resistor R4 connected between the base and emitter of transistor TR1, and transistor T1.
A parallel circuit of a resistor R5 and a capacitor C3 connected between the base 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 and. In this waveform shaping circuit, when the negative first signal Vs1 is generated from the signal coil Ls, a pulsed base current flows through the transistor TR1 through the parallel circuit of the resistor R5 and the capacitor C3. As a result, the transistors TR1 and TR2 are turned on for a short time, and the first pulse signal is output between the emitter and 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 has a positive second signal Vs2 at both ends of the capacitor C5. The second pulse signal is output through the diode D6 when the voltage of the above is exceeded.

The reference voltage generating circuit 204 is composed of a flip-flop circuit F to which the power supply voltage Vcc is applied from the power supply circuit 4, and its input terminal is supplied with the first pulse signal obtained from the first waveform shaping circuit 202. ing. Further, 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 of the waveform shaping circuit 203 (cathode of the diode D6) through the resistor R8, and the resistor R9 and the capacitor C6 are connected in parallel between the base and emitter of the transistor TR3.

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

Therefore, the reference voltage generating circuit 204 is similar to that shown in FIG.
As shown in (B) and FIG. 3 (B), the first signal Vs1
Generates a reference voltage Vq having a rectangular waveform in the section from a position (maximum advancing position) θ1 at which the threshold value reaches the threshold level to a position (minimum advancing position) θo at which the second signal Vs2 reaches the threshold level.

The first advance control integration circuit 205 has an NPN transistor TR4 whose collector is 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 the base of the transistor TR4 and the base ground, respectively, a first advance-angle controlling integration capacitor Ca1 connected between the emitter of the transistor TR4 and the ground, and a transistor TR4.
And a resistor R12 connected between the collector and emitter of the. The non-grounded terminal of the integrating capacitor Ca1 is connected to the collector of the transistor TR3 through the diode D7.

In the integrating circuit 205 described above, when the reference voltage Vq is generated at the maximum advance position θ1, the first advance control integration capacitor Ca1 passes between the collector and emitter of the transistor TR4 to apply the reference voltage Vq to the resistor R10. And, the voltage is instantly charged to the voltage Vq1 divided by R11. When the capacitor Ca1 is charged to the voltage Vq1, the transistor TR
Since the base current does not flow through the transistor 4 and the transistor is cut off, the integrating capacitor Ca1 is additionally charged by the reference voltage Vq through the resistor R12 with a constant time constant. When the second signal Vs2 is generated at the minimum advance position θo, the transistor TR3 becomes conductive, so that the charge of the integrating capacitor Ca1 is instantly discharged 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 instantly rise to a constant voltage Vq1 at the maximum advance position θ1. After that, the first advance angle control integrated voltage Va1 having a waveform rising to the minimum advance position θo with a constant inclination is obtained.

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

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

The first idling control integrating capacitor Ci1 is charged by the reference voltage Vq through the resistor R14 with a constant time constant. The second signal Vs2 at the minimum advance position θo
Occurs (when the threshold level is reached), the transistor T
When R3 'becomes conductive, the charge of the integrating capacitor Ci1 is instantly discharged 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 at a predetermined inclination and reach the minimum advance position .theta.o. The first integrated voltage Vi1 for idling control having a waveform that returns to zero is obtained.

Second idling control integration circuit 208
Is a resistor R15 whose one end is 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 the ground.
The non-ground side terminal of the second idling control integration capacitor Ci2 is connected to the transistor TR3 'through the diode D8'.
Connected to the collector.

The second idling control integrating capacitor Ci2 is charged by the constant power supply voltage Vcc through the resistor R15 with a constant time constant. When the second signal Vs2 is generated at the minimum advance position θo, the transistor TR3 'becomes conductive, so that the charge of the integrating capacitor Ci2 is instantaneously discharged 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 integrating capacitor Ci2 are raised from the minimum advance angle position θo by a predetermined inclination to reach the next minimum advance angle. The second advance angle control integrated voltage Vi2 having a waveform that returns to zero at the position θo
Is obtained.

The reference voltage generating circuit 210 is composed of a series circuit of resistors R16 and R17 connected between the output terminals of the standard voltage generating circuit 204. This circuit divides the reference voltage Vq to divide the reference voltage Vr. To occur.

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

The advance fire position calculation circuit 211 is composed of a comparator CP1 and a resistor R18 connected between the output terminal of the comparator CP and the output terminal of the power supply circuit 4, and has a non-inverting input of the comparator CP1. Terminal (+ terminal) and inverting input terminal (-terminal)
The first advance angle control integrated voltage Va1 and the second advance angle control integrated voltage Va2 are input to the respective terminals.

In the ignition position calculation circuit for this advance angle,
A first advance angle control integrated voltage Va1 obtained at both ends of the first advance angle control integration capacitor Ca1 and a second advance angle control integrated voltage obtained at both ends of the second advance angle control integration capacitor Ca2. The idling time ignition position calculation circuit 212 that compares the Va2 and outputs the advanced angle ignition position signal Vf1 when the first advanced angle control integrated voltage Va1 exceeds the second advanced angle control integrated voltage Va2. , The first integrated voltage Vi1 for idling control
And the reference voltage Vr are input to the inverting input terminal and the non-inverting input terminal of the first idling control comparator C, respectively.
P2 and a second idling control comparator CP3 having the first idling control integrated voltage Vi1 and the second idling control integrated voltage Vi2 input to the non-inverting input terminal and the 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 the resistor R19.

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

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

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

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

In the present 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 number of rotations of the internal combustion engine reaches the idling speed Ni. Is set so that the rotational angle position where the first idling control integrated voltage Vi1 is equal to the second idling control integrated voltage Vi2 is equal to the idling ignition position advanced from the minimum advance position. Are set to constants of the first and second idle control integrating circuits 207 and 208. Further, when the revolution speed of the internal combustion engine reaches the advance start revolution speed which is set higher than the idling revolution speed, the first advance angle control integrated voltage Va1 is applied to the second advance angle control at the ignition position for idling. The constants of the first and second advance angle controlling integrating circuits 205 and 206 are set so as to exceed the integrating voltage Va2 for use.

In the above embodiment, when the engine is started, the ignition timing ignition position calculation circuit 211 and the idling ignition position fire position calculation circuit 212 do not generate the ignition position signals Vf1 and Vf2. When the signal Vs2 of No. 2 reaches the threshold level, the waveform shaping circuit 203 and the ignition position signal generation circuit 2 at the time of starting from the signal coil Ls.
When the starting 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 when starting the engine becomes the minimum advance angle position θo, and by setting this minimum advance angle position θo at a position suitable for starting, without causing ketching,
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 integrating circuit start operating normally, so as shown in FIGS. 2 (C) and 2 (D). 1st and 2nd integrated voltage V for idling control
i1 and Vi2 are generated, and as shown in FIG.
And second advance angle control integrated voltages Va1 and Va2 are generated. While the engine rotation speed is lower than the advance angle start rotation speed N1, the first advance angle control integrated voltage Va1 exceeds the second advance angle control integrated voltage Va2 as shown in FIG. 2 (F). 2 cannot be performed (Va1 and Va2 cannot cross each other).
As shown in (G), the advance ignition timing calculation circuit 211
Cannot output the ignition position signal Vf1.

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

When the rotational speed N is lower than the idling rotational speed Ni, the second idling control comparator CP3 outputs a high-level control signal e2 as shown in FIG. 2 (C).
Is output when the first idling control integrated voltage Vi1 is output.
Is larger than the reference voltage Vr, the comparator CP2
The control signal e1 output by the is at zero level. Therefore, in the region where the rotation speed is lower than the idling rotation speed Ni, even when the comparator CP3 generates the high level control signal e2, the idling time ignition position calculation circuit 212 outputs the idling time ignition position signal Vf2. The ignition operation is performed at the minimum advance position θo.

When the rotation speed N is equal to or higher than the idling rotation speed Ni, the first idling control integrated voltage Vi1 is always lower than the reference voltage Vr, as shown by the chain double-dashed line in FIG. 2 (C). Therefore, the control signal output from the comparator CP2 is always in the high level state. Therefore, 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, an idling ignition position signal Vf2 as shown in FIG. 2 (E) is generated. , The ignition position signal Vf2 is the ignition signal Vf
It is given to the gate of the thyristor Th1 as [FIG. 2 (H)]. Therefore, the ignition operation is performed at the generation position θi of the ignition position signal Vf2 at the time of idling in the region where the engine speed is equal to or higher than the idling speed Ni and is lower than the advancing start speed N1.

Generally, when two integrated voltages Vi1 and Vi2 rising from zero volt with a constant time constant are compared, the position where the two integrated voltages are equal becomes constant regardless of the engine speed, so that at idling. The ignition position θi of is always constant. The ignition position θi at this idling is
It can be appropriately adjusted by changing the constants of the first and second idle control integration circuits 207 and 208.

When the engine revolution speed reaches the advance start revolution speed N1, as shown in FIG. 3 (F), the first advance control integral voltage Va1 is changed to the second advance control voltage Va1 at the ignition position θi during idling. The comparator CP1 is adapted to generate the advance-position fire position signal Vf1 when the advance-angle control integrated voltage Va2 is exceeded, and the advance-position fire position signal Vf1 is supplied to the gate of the thyristor Th1 as the ignition signal Vf. Become. First advance angle control integrated voltage V
At the position where a1 exceeds the second advance angle control integrated voltage Va2 (the position where the advance ignition timing signal Vf1 is generated), the advance angle advances with the increase of the revolution speed, and therefore the advance start revolution speed N1. In the above range, the ignition position advances as the rotation speed increases.

When the ignition position reaches the maximum advance position θ1 after reaching the advance end rotation speed N2, the advance operation stops, and the ignition position reaches the maximum advance position θ1 in the region where the advance end rotation speed N2 is exceeded. Fixed.

Therefore, according to the above-described embodiment, as shown in FIG. 4, ignition is performed at the minimum advance position θo in the region where the engine speed is equal to or higher than the starting revolution speed No and is lower than the idling revolution speed Ni, and the advance angle is equal to or more than the idling revolution speed Ni. Ignition is performed at the ignition position θi at idling in the region where the starting revolution speed is less than N1, and the ignition position is advanced from θi to θ1 in the region where the advancing start revolution speed N1 or more and the advancing end revolution speed N2 or less. To be Therefore, by setting the minimum advance position θo appropriately, the ignition position at the time of starting can be set to a position where no ketching occurs. Further, by adjusting the constants of the first and second idling control integrating circuits 207 and 208, the ignition position θi at idling can be appropriately adjusted without changing the configuration of the rotor of the signal generator 201. it can.

In the above embodiment, the transistor TR3,
Resistors R8, R9, a capacitor C6 and a diode D7,
D8, the transistor TR3 ', the resistors R8', R9 ', the capacitor C6' and the diodes D7 ', D8' allow the first and second advance angles when the second signal Vs2 reaches the threshold level. The reset circuit 209 is configured to instantly discharge the control integration capacitors Ca1 and Ca2 and the first and second idling control integration capacitors Ci1 and Ci2.
One transistor TR3 may be used to reset all the integration capacitors Ca1, Ca2, Ci1 and Ci2.

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

[0068]

As described above, according to the present invention, an advance point ignition position calculation circuit for generating an advance point ignition position signal having a characteristic of advancing the occurrence position with an increase in the number of revolutions, and a minimum In addition to the starting fire position signal generating circuit that generates the starting fire position signal at the advanced position, the idling time fire position calculation circuit that generates the idling time fire position signal when the engine speed reaches the idling speed Since the ignition signal is provided to the ignition circuit when any of the advance ignition position ignition position signal, the idling ignition position ignition position signal, or the starting ignition position ignition position signal is generated, the ignition rotation speed is equal to or more than the starting rotation speed and less than the idling rotation speed. Ignition is performed at the minimum advance angle position in the region, and ignition is performed at the ignition position at idling in the region where the idling speed is equal to or higher than the advancing start rotation speed, and is advanced beyond the advancing start 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. Therefore, by appropriately setting the minimum advance angle position, the ignition position at the time of starting can be set to a position where no ketching occurs, and safety can be improved.

According to the present invention, by adjusting the constants of the first and second idling control integrating circuits,
Since the ignition position at idling can be adjusted appropriately 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 it is possible to inexpensively provide an ignition device having characteristics that meet the requirements of the engine.

[Brief description of drawings]

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

FIG. 2 is a waveform diagram showing voltage waveforms of respective parts in FIG. 1 in a rotation region lower than an advance angle starting 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 angle starting rotation speed.

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

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

[Description of Reference Signs] 1 ignition circuit 2 ignition position control circuit 201 signal generator 202 waveform shaping circuit 203 waveform shaping circuit 204 reference voltage generation circuit 205 first advance angle control integration circuit 206 second advance angle control integration circuit 207 First idling control integration circuit 208 Second idling control integration circuit 209 Reset circuit 211 Advance point ignition position calculation circuit 212 Idling point ignition position calculation circuit

Claims (1)

[Claims] 1. An internal combustion engine comprising: an ignition circuit that generates a high voltage for ignition when an ignition signal is given; and an ignition position control circuit that gives 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 generator 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
To the position where the signal reaches the threshold level, a reference voltage generating circuit that generates a reference voltage having a rectangular waveform in the section, and a first advance angle controlling integration capacitor are provided to the constant voltage at the maximum advance position by the reference voltage. A first advance-angle-control integration circuit that performs an integration operation of instantaneously charging and then an additional charge with a predetermined time constant; and 2) an advance control integration circuit, a first idling control integration circuit that performs an integration operation of charging the 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 controls when the second signal reaches a threshold level. Integrating capacitors and the first and second
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, and a reference voltage generation circuit provided at both ends of the first advance control integration capacitor. The first advance angle control integrated voltage is compared with the second advance angle control integrated voltage obtained across the second advance angle control integration capacitor. 2. An advance point ignition position calculation circuit that outputs an advance point ignition position signal when the advance angle integration voltage of 2 is exceeded; and a first idling control obtained at both ends of the first idling control integration capacitor. And a reference voltage, and generates 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. First to do A first idling control comparator by comparing the idling control comparator with the first idling control integration voltage and the second idling control integration voltage obtained at both ends of the second idling control integration capacitor. A second idling control comparator that generates a second control signal that takes a first state and a second state when the integrated voltage is higher and lower than the second idling control integrated voltage, respectively. And an idling time ignition position calculation circuit that outputs an ignition time ignition position signal when both the first control signal and the second control signal are in the first state, and the second signal as an input. A starting fire position signal generating circuit that outputs a starting fire position signal when the second signal reaches a threshold level; and the advance fire position signal and idling. An ignition signal supply circuit that gives an ignition signal to the ignition circuit when either the ignition position signal at the time of ignition or the ignition position signal at the time of starting is generated, the first signal when the rotation speed of the internal combustion engine reaches the idling rotation speed. The magnitude of the reference voltage is set so that the maximum value of the first idling control integrated voltage is lower than the reference voltage, and the first idling control integrated voltage and the second idling control integrated voltage are The constants of the first and second idling control integrating circuits are set so that the equalized rotational angle positions are equal to the ignition position for idling advanced from the minimum advanced angle position, and the rotational speed of the internal combustion engine is set to the above-mentioned value. When the advance start rotation speed set higher than the idling rotation speed is reached, at the ignition position for idling, the first advance angle control integrated voltage causes the second advance angle to increase. 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.