JP3281252B2 - Ignition control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an ignition control device.

[0002]

2. Description of the Related Art Various types of ignition devices for automobile engines are used. For example, in order to control a speed limit in a four-stroke engine, as shown in FIG. (For example, 7000 rpm
m) or more, the ignition timing is retarded to reduce the engine output. The advance control is performed at the most advanced angle DF up to the predetermined high rotational speed NR, but at the predetermined high rotational speed NR or higher, the most retarded angle DS most retarded according to the increase in the engine rotational speed. Until the retard control. Further, in the case of a two-cycle engine, it is preferable to retard the ignition timing in order to perform good ignition at high rotation.

[0003]

Although such control can be performed by digital control by a CPU in a control circuit of, for example, a CDI system, there is a problem that the control circuit becomes complicated and soars.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, it is possible to realize an ignition control device which can perform a retard control at a high rotation speed with a simple control circuit which can be inexpensive and can save power. According to the present invention, there is provided an advancing range signal generating means for generating a most advancing signal and a most retarding signal for defining an advancing control range of the engine, and an ignition control within the advancing control range. a ignition control device having a lead angle control circuit for generating a signal, is charged <br/> electricity starts to discharge at a first time constant from instantaneously upon occurrence of the most retarded signal, said first One
The discharge is performed at a second time constant smaller than the first time constant from the time of generation of the most advanced signal to the time of generation of the most retarded signal generated during the discharge at the time constant, and Time constant
At the instant of occurrence of the most retarded signal generated during the discharge at
A CR circuit that is configured to be repeatedly charged to
A retard comparator circuit for comparing a discharge waveform according to the second time constant of the CR circuit with a reference voltage value and generating an ignition control signal when the two waveforms cross each other. Provided in parallel with a control circuit, wherein the first time constant is set so that a discharge waveform based on the second time constant is lower than the reference voltage value until the engine exceeds a predetermined high rotational speed; When the engine speed exceeds a high engine speed, the intersection between the discharge waveform based on the second time constant and the reference voltage value is set to be retarded as the engine speed increases, and the retard comparator circuit
From the time when the most advanced signal is generated to the most retarded signal.
Comparator for supplying only up to the time when the signal occurs
Power supply unit .

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to specific examples shown in the accompanying drawings.

FIG. 1 is a main part control circuit diagram of an ignition device for a four-cycle engine of a motorcycle to which the present invention is applied. The waveform signal of the exciter coil 1 is applied to the terminal E of the control circuit 2
The signal is input to the XT, becomes a positive half-wave via the diode D1, and charges the main capacitor C1. The main capacitor C1 is selectively discharged by the thyristor SCR.
The electric power is supplied to the primary coil of the ignition coil 3 via N, and discharge is performed by the plug 4 connected to the secondary coil of the ignition coil 3.

The signal input to the terminal EXT is also input to the thyristor trigger circuit 6 via the circuit power supply 5, and the thyristor trigger circuit 6 controls the gate of the thyristor SCR. .

A pulser coil 7 is connected to a terminal PC of the control circuit 2 for outputting a pulse wave at the most advanced angle and the most retarded angle in the range in which the advance control is performed. The pulsar signal of the pulsar coil 7 is sent to the control circuit 2 via a terminal PC.
Pulsar input circuit section 8 as a lead angle range signal generating means inside
The pulse-like maximum advance signal output corresponding to the most advanced angle is input to the pulser control voltage pulse generator 9, and the pulse-like maximum retardation signal output corresponding to the most retarded time is generated by the pulser. The control voltage pulse is supplied to the control voltage pulse generator 9 and the advance angle controller 10.

The pulser control voltage pulse generator 9 forms a pulser control voltage pulse signal having a pulse width corresponding to the advance control range to define the advance control range.
The pulser control voltage pulse signal is input to the advance control circuit 10 and the comparator power supply 11. Then, a lead angle control signal is output from the lead angle control circuit section 10 to the thyristor trigger circuit section 6, and the thyristor trigger circuit section 6 outputs the thyristor SC in accordance with the lead angle control signal.
A trigger signal is output to R.

A retard control circuit 12 is provided in parallel with the advance control circuit 10, and the retard control circuit 1
2 also includes the most retarded signal (signal at node C in the figure) from the pulser input circuit section 8 and the pulser control voltage pulse signal (signal at node D in the figure) from the pulser control voltage pulse generator 9. You are typing. Then, the retard control signal from the retard control circuit 12 is input to the advance control circuit 10. The advance control circuit section 10 and the retard control circuit section 12 are supplied with a power supply voltage by a comparator power supply section 11.

Next, details of each circuit will be described below with reference to FIGS. The circuit power supply unit 5 configured as shown in FIG. 2 is provided with a constant voltage terminal Vcc for voltage supply in each circuit in the control circuit 2.

The thyristor trigger circuit 6 is configured as shown in FIG. 3, and includes a transistor Q1 which is turned on by an advance control signal from the advance control circuit 10. The thyristor trigger signal is output to the thyristor SCR according to the ON state of the transistor Q1.

The pulsar input circuit section 8 is configured as shown in FIG. 4. In this embodiment, the most advanced pulse signal from the pulsar coil 7 is a positive pulse wave, and the most retarded signal. Is a negative pulse wave, the transistor Q2 is turned on by the most advanced pulse signal, and the transistor Q3 is turned on by the most retarded signal. Then, on signal of the transistor Q2 is output to the pulser control voltage pulse generator 9 as the most advanced angle signal, on signal of the transistor Q3 pulser control as the most retarded angle signal
It is output to the voltage pulse generator 9 and the advance control circuit 10.

The pulsar control voltage pulse generator 9 includes transistors Q4, Q5, Q6, Q7 as shown in FIG.
Is configured. When the transistor Q4 is turned on by the most advanced signal by turning on the transistor Q2 of the pulser input circuit section 8, the transistor Q7 is turned on via the transistor Q5, and the ON signal of the transistor Q7 is set to the above-mentioned pulser. Advance control circuit 1 as control voltage pulse signal
0 and output to the comparator power supply unit 11. Further, when the transistor Q6 is turned on by the most retarded signal due to the turning on of the transistor Q3, the transistor Q7 is turned off and the output of the pulser control voltage pulse signal is stopped.

The advance angle control circuit section 10 is configured as shown in FIG. In the advancing control circuit 10, the transistor Q8 is turned on by the most retarded signal from the transistor Q3 of the pulser input circuit 8, and the capacitor C2 is fully charged (voltage Vc) by turning on the transistor Q8.
c) When the transistor Q8 is turned off, the resistance R
1 is discharged. In response to the ON signal of the transistor Q7 of the pulser control voltage pulse generator 9, the transistor Q10
Is turned on, and the transistor Q11 is turned on. When the transistor Q11 is off, the voltage Vd divided by the resistors R2 and R3
, The capacitor C3 is charged and the transistor Q11
Is turned on, the capacitor C3 is discharged via the resistor R4.

The potential of each of the capacitors C2 and C3 is input to an advance angle comparator CP1, and the output of the advance angle comparator CP1 turns on the transistor Q13 via the transistor Q12. The signal is input to the thyristor trigger circuit 6.

The comparator power supply section 11 is configured as shown in FIG. The transistor Q15 is turned on via the transistor Q14 which is turned on by the on signal of the transistor Q7 of the pulser control voltage pulse generator 9, and the transistor Q20 is also turned on. Via the transistor Q20, a control power supply voltage is supplied as a power supply voltage of the advance angle comparator CP1 of the advance angle control circuit section 10.

The retard control circuit 12 is configured as shown in FIG. The transistor Q16 is turned on by the signal at the node C, and the capacitor C5 is discharged by turning on the transistor Q16. Thereafter, the capacitor C5 is discharged at the first time constant by the resistor R5, and when the transistor Q17 is turned on by the signal of the node D, the second resistor smaller than the first time constant is added by adding the resistor R6. It discharges with a time constant.
The capacitor C5 and the resistors R5 and R6 are used for CR times.
The road is configured.

The signal at node I, which is the charging potential of the capacitor C5, is input to the retard comparator CP2,
The reference voltage Vj divided by both resistors R7 and R8 is input to the retard comparator CP2. Further, the retardation comparator CP2 is turned on by turning on the transistor Q15 of the comparator power supply section 11,
Transistor Q1 which is turned on by a signal input to
The control power supply voltage is supplied as the power supply voltage of the retardation comparator CP2 when the transistor Q18 is turned on. The output signal from the retard comparator CP2 is input to the advance control circuit 10 and the transistor Q13 is turned off, so that the output signal of the transistor Q13 is not input to the thyristor trigger circuit 6 and the ignition timing is set. Perform retard control.

The operation of the control circuit 2 thus constructed will be described below with reference to the waveform diagram of FIG. A substantially sine wave signal from the exciter coil 1 is input to the terminal EXT, and a pulse wave generated by the pulsar coil 7 at the most advanced angle and the most retarded angle in the range in which the advancing control is performed is input to the terminal PC. ing. In the present embodiment, when viewed at the node A in FIG. 1, as shown in the first stage of FIG. 9, the waveforms are single pulse waveforms that are positive at the most advanced angle and negative at the most advanced angle.

The signal at the node A is supplied to the pulsar input circuit 8.
The pulse wave corresponding to the most advanced angle and the most retarded angle is output from the pulsar input circuit section 8 to the second stage (waveform at node B in FIG. 1) and the third stage in FIG. It is output as shown in the eye (waveform at node C in FIG. 1). The signals at the nodes B and C are input to the pulser control voltage pulser generator 9, and the pulser control voltage pulser generator 9 shows the waveform at the node D in FIG. Thus, a rectangular wave that rises at the most advanced angle and falls at the most retarded angle is output.

The signal generated at node D is
In the advance control circuit 10, the transistor Q9 is turned on to turn on the transistor Q10 and turn on the transistor Q11. Further, a signal generated at the node D is also input to the comparator power supply unit 11, and the signal at the node D causes the comparator power supply unit 11 to operate. Therefore, the comparator power supply 11 operates only during the width of the signal generated at the node D, and the constant voltage
20, the lead angle comparator C of the lead angle control circuit unit 10
P1 is enabled. That is, the advance comparator CP1 operates only while a signal is generated at the node D.

Next, the signal waveform of each node EF shown in FIG. 6 as an input signal to the advance angle comparator CP1 will be described below with reference to the fifth stage in FIG.

The potential of the node E gradually increases according to the time constant of the capacitor C2 and the resistor R9 from the input of the signal D, and the transistor Q10 is turned off when the signal D disappears. Since the capacitor C2 is turned on, the capacitor C2 is instantaneously charged and reaches the constant voltage Vcc. Then, since the capacitor C2 is discharged by the resistor R1 due to the disappearance of the signal C, the voltage gradually decreases as shown in FIG. 9 until the transistor Q10 is turned on by the next input of the signal D.

Since the transistor C11 is turned on when the signal D is input and the capacitor C3 is discharged, the potential of the node F is changed from the predetermined potential Vd as shown in the fifth stage of FIG. After the signal D disappears, it gradually increases in accordance with the time constant of the capacitor C3 and the resistors R2 and R3, and returns to a predetermined potential Vd.

Since each of the signals EF that change as described above is input to the advance angle comparator CP1, the output signal (node G) of the advance angle comparator CP1 becomes the node signal as shown in the sixth stage of FIG. When the signal level of E exceeds the signal level of node F, it is switched to a negative level and output.

Further, since the advance angle comparator CP1 operates with the voltage supplied from the comparator power supply section 11, when the signal D disappears, that is, at the end of the range in which the advance angle control is performed, as described above, the advance angle comparator CP1 operates. The operation stops, and the potential of the node G returns to the original state as shown in FIG. While the operation signal of the advance angle comparator CP1 (the signal at which the node G is at the ground level) is output, the transistor Q13 is turned on, and the ON signal is input to the thyristor trigger circuit section 6, and the thyristor trigger circuit The transistor Q1 of the section 6 is turned on.

When the transistor Q1 is turned on, the main capacitor C1 is selectively discharged through the thyristor SCR as described above, and the discharge voltage is supplied to the primary coil of the ignition coil 3 through the terminal IGN.
Discharge is performed at the plug 4 connected to the secondary coil of the ignition coil 3.

As described above, when the intersection of each potential between the nodes EF becomes the ignition timing, and the engine speed increases, the change in the signal level of the node E becomes relatively small with respect to the node F. As shown by the imaginary line in the fifth stage of No. 9, the next charge starts at the stage of less discharge,
The ignition timing Ti is advanced, and the advance angle is controlled. When the engine speed becomes low, the discharge time of the node E becomes long contrary to the above, so that the ignition timing Ti becomes late and the retard control is performed.

When the level of the signal E becomes higher than that of the signal F due to a high engine speed, the advance angle comparator CP1
Is output at the timing of the most advanced angle DF, and the ignition is controlled in the most advanced angle DF state at higher rotations.

Next, the control procedure according to the present invention when the rotational speed is equal to or higher than the predetermined high rotational speed NR shown in FIG. 11 will be described below.
The relationship between the signals EF is such that the level of the signal E is always higher than that of the signal F when the rotational speed is equal to or higher than the predetermined high rotational speed NR, as shown in the upper part of FIG. Therefore, although ignition is normally controlled at the timing of the most advanced angle DF as described above, according to the present invention, the transistor Q13 of the advanced angle control circuit An angle control signal is output, and the ignition timing is controlled by the retard control signal.

The retard control signal is supplied to a retard comparator C
The output of P2 (the signal at the node K in FIG. 8) is controlled as described above. The charge and discharge of the capacitor C5 is controlled in accordance with the signals C and D, and the signal at the node I indicating the change in the potential is shown in FIG. As shown in the middle stage, the waveform changes up and down with respect to the reference voltage Vj and is input to the retard comparator CP2. When the signal I and the reference voltage Vj intersect (Ti), the ignition signal becomes a positive level (the lower part of FIG. 10).
Is output from the retard comparator CP2, and the transistor Q13 of the advance control circuit section 10 is turned on in response to the ignition signal, so that ignition is performed at the retarded ignition timing.

Since the signal I increases as shown by the imaginary line in the middle part of FIG. 10 as the rotational speed further increases, the intersection of both signals I.J (Vj) moves to the most retarded angle DS side. The ignition control is further retarded. Therefore,
Above a predetermined high rotational speed NR, retarded ignition control is performed, and since it is not misfire control, the output does not drop sharply and the output can be suppressed smoothly.

When the most retarded DS control state is established, the signal H is output.
However, in the present embodiment, the hard trigger unit 13 including the transistor Q19 that is turned on by the signal C is provided, and the transistor Q13 of the advance control circuit unit 10 is turned on by the on signal of the transistor Q19. Is configured. Therefore, the ignition control can be performed at the timing of the most retarded angle DS, and the ignition control by the most retarded angle DS is performed in the high rotational speed region beyond the retardation control range equal to or higher than the predetermined high rotational speed NR, which is very suitable. Output reduction control can be performed.

In this circuit, as described above, the discharge time constant of the signal I is changed to be small by the signal D, and the signal I intersects the reference voltage Vj at a relatively large angle during high rotation. It is possible to do. Therefore, highly accurate retard control at the time of high rotation can be performed.

Further, as described above, since the control power supply voltage is supplied as the power supply voltage of the retardation comparator CP2 via the transistor Q18 which is turned on by the comparator power supply unit 11, only the retardation comparator within the advance control range. Since the CP2 operates, wasteful power is not consumed when the advance control is not performed, and an effect of power saving can be obtained.

[0037]

As described above, according to the present invention, the discharge waveform of the CR circuit is compared with the reference voltage value, and the retard control is performed at a predetermined high rotational speed or more, thereby simplifying the CR circuit and the comparator. The output reduction control at the time of high rotation can be performed with a simple circuit configuration, and the circuit can be simplified and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a main part control circuit diagram of an ignition device for a four-cycle engine of a motorcycle to which the present invention is applied.

FIG. 2 is a circuit diagram showing a circuit power supply unit 5 of FIG.

FIG. 3 is a circuit diagram showing a thyristor trigger circuit section 6 of FIG. 1;

FIG. 4 is a circuit diagram showing a pulsar input circuit section 8 of FIG. 1;

FIG. 5 is a circuit diagram showing a pulser control voltage pulse generator 9 of FIG. 1;

FIG. 6 is a circuit diagram showing an advance angle control circuit unit 10 of FIG. 1;

FIG. 7 is a circuit diagram showing a comparator power supply unit 11 of FIG. 1;

FIG. 8 is a circuit diagram showing a retard control circuit section 12 of FIG. 1;

FIG. 9 is a time chart showing a voltage waveform in a main part of the control circuit.

FIG. 10 is a time chart showing a voltage waveform of a main part at the time of high rotation according to the present invention.

FIG. 11 is a diagram showing a conventional ignition timing characteristic.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 exciter coil 2 control circuit 3 ignition coil 4 plug 5 circuit power supply unit 6 thyristor trigger circuit unit 7 pulser coil 8 pulser input circuit unit 9 pulser control voltage pulse generation unit 10 advance angle control circuit unit 11 comparator power supply unit 12 delay angle control circuit unit 13 Hard trigger section

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-5-157031 (JP, A) JP-A 1-134072 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F02P 5/15 F02D 43/00

Claims (1)

(57) [Claims] 1. An advance range signal generating means for generating a most advanced signal and a most retard signal for defining an advance control range of an engine, and an ignition control signal within the advance control range. An ignition control device having an advance angle control circuit, wherein the discharge is started at a first time constant after being charged instantaneously when the most retarded signal is generated, and during the discharge at the first time constant,
From the time of occurrence of the most advanced angle signal to the time of occurrence of the most retarded signal, discharge occurs at a second time constant smaller than the first time constant, and during the discharge at the second time constant, Occur
That the instantaneous charging is performed by the generation of the most retarded signal.
A CR circuit configured to be repeated, a discharge waveform based on the second time constant of the CR circuit, and a reference voltage value, and a retard angle for generating an ignition control signal when the two waveforms cross each other. A retard control circuit having a comparator circuit is provided in parallel with the advance control circuit, and the first time constant is changed by the discharge waveform according to the second time constant until the engine exceeds a predetermined high speed. When the engine speed is higher than the predetermined high engine speed, the point at which the discharge waveform based on the second time constant intersects the reference voltage value is delayed as the engine speed increases. and sets so as to angle, the power supply voltage of the retard comparator circuit the most advanced angle signal
Only from the time of occurrence to the time of occurrence of the most retarded signal.
An ignition control device provided with a comparator power supply unit for supplying .