JPS63195385A - Ignition timing controller for engine - Google Patents

Abstract

PURPOSE:To optimumize an advance angle regulation according to the revolution of an engine by, when being in the low revolution sphere is detected on the basis of a pick-up signal, switching to the second angle-advance control system from the first system and giving an ignition signal to a switching element. CONSTITUTION:At the time of the ordinary revolution of an engine, an analogue switch 10 is on the first angle-advance control system A side by means of the output of a revolution-detection-circuit 9, and a pickup signal from a sensor 3 synchronous with the revolution of the engine is subjected to an angle-advance regulation according to revolution at an angle-advance control circuit 5 through an operation-amplifier 4, and the off-timing of a switching element Q is controlled. Meanwhile, at the time of low revolution, the switch 10 is changed over to the second angle-advance control system B side, and an ignition signal which is, regardless of the number of the revolutions of the engine, always almost fixedly angle-retarded is made out of a negative electrode quality signal taken out of the pick-up signal by a comparator 6, and an ignition control is conducted through the element Q. Thus, in the ordinary revolution sphere is conducted the optimum advance angle regulation according to its revolution, and in the low revolution sphere is conducted a stable ignition at an almost fixed angle-advance value.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electronic engine ignition timing control device that automatically and optimally adjusts the ignition timing of an engine according to the engine speed.

W end technology - A constant current circuit that uses an ignition signal obtained in synchronization with engine rotation as a device that can obtain highly accurate advance angle characteristics that match engine characteristics that cannot be obtained with conventional mechanical governor advance devices. charge the capacitor through
When the charging voltage of the capacitor reaches a certain value, a predetermined delayed and advanced ignition signal is applied to the power transistor for switching provided on the primary side of the ignition coil to adjust the engine's ignition timing. An electronic engine ignition timing control system has been developed (see Japanese Patent Publication No. 48-35893).

However, when controlling the ignition timing of an engine like this, if the advance angle is adjusted in the same way as during normal engine rotation when the engine is started, the ignition timing will be delayed due to the large change in engine rotation when the engine is started. The timing control does not follow the rotational fluctuations, and as a result, there is a risk of problems such as the engine's ignition timing being greatly deviated or the butting phenomenon occurring.

[bHiroshi] The present invention has been made in consideration of the above points, and it is possible to adjust the advance angle by Q″a according to the engine rotation during normal engine rotation, and to adjust the advance angle by Q″a according to the engine rotation. To provide an ignition timing control '!A position for an engine that can perform an almost constant advance interval 1y without greatly deviating the ignition timing change !lj even when the engine is running at low engine speed.

Mo11)♂7.

In order to achieve this objective, the present invention performs advance angle control according to the engine rotation based on a positive signal taken out by amplifying the pickup BO synchronized with the engine rotation. switching to intermittent the primary current of the ignition coil; a first advance control system that connects IJ to +3T-; and a negative pole (1
a second advance angle control system that extracts the signal from the pickup signal and generates an ignition signal with almost constant retardation; is detected, and when the rotation speed is in a low rotation range, the first advance angle control system is switched to the second advance angle control system, and the ignition signal by the second advance angle control system is switched to 1) 1). A control system switching means for supplying signals to the elements is provided.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings.

In the engine ignition timing control device according to the present invention,
As shown in Fig. 1, a pickup (based on No. 8) according to the engine rotation given by a sensor 3 consisting of a reluctor I and a pickup coil 2 (1) adjusts the advance angle according to the engine rotation during normal engine rotation. The first thing to do is m-square control system 8 and the same pickup C
! The second advance angle control system B performs almost constant advance angle adjustment at low rotation speeds such as when starting the engine based on the engine speed, and detects whether the engine is in the low rotation range based on the pickup signal. A rotation detection circuit 9, an analog switch 10 for switching a control system that switches between a first advance angle control system resistance A and a second advance angle control system B according to the rotation detection result, and the analog switch 10. The ignition signal outputted from the first advance angle control system Δ or the ignition signal outputted from the second advance angle control system 13, which has been switched over, is amplified and the ignition coil 1 is installed on the primary side of the CC. The first advance angle control system resistor A includes an operational amplifier 4 which amplifies the pickup signal and extracts the positive polarity signal. and an advance angle control circuit 5 which will be described later and adjusts the advance angle according to the rotation of the engine based on the extracted positive polarity (l').

The second advance angle control system B compares the negative polarity of the pick-up signal with the set threshold value of F11, and determines a constant advance angle of 1 degree. The comparator is 6 or 1).

In addition, the rotation detection circuit 9 compares the peak bold circuit 7 that performs the peak rise of the Big Ala 14d with the threshold value of the low rotation range set to 51 and the peak value of the peak value. When ° is below the threshold value, the analog switch IO is switched to the Δ side of the first advance angle control system, giving 14j-, and when the peak value is lower than the threshold value, the analog C lag [ 0 to second advance angle control system B
The comparator 8 which converts 4yt'Jf'C'fi to the side has 1+-4.

In the first episode, DrSll is the distributor, SP is the spark plug, lSA'l' is the battery, and the yumata 12 that shows IL is for supplying the reference voltage to the comparators 6 and 8, respectively. shows the voltage stabilization circuit.

However, the ignition of the engine according to the present invention has been carried out in this way! ,? In the period control 91 device, during normal rotation when the engine speed rises above a certain level, the analog switch 10 performs the first advance angle control in response to the high level signal output from the rotation detection port 'iiS'J at that time. The system has been switched to the Δ side, and the first advance angle control circuit 8 on 2F adjusts the engine rotation based on the positive signal taken out by rectifying and amplifying the pickup signal synchronized with the engine rotation. The advance angle is adjusted accordingly, and the ignition timing of the engine is controlled.

Also, when the engine is starting (a), the low rotation state of the engine is detected by the rotation detection circuit 9, and at that time, the analog switch 10 is activated by the low level signal output from the rotation detection circuit 9. Switch to the angle control system B side, ]L.

In the second advance control system B, the ignition signal is always retarded almost constant regardless of the engine speed, based on a negative polarity signal extracted from a pickup signal synchronized with engine rotation. is created and engine ignition control is performed.

Therefore, according to the present invention, even when the engine rotational speed is in a low rotational speed range such as when starting with large rotational fluctuations, the engine ignition is not affected by the rotational fluctuations (i.e., the engine is ignited at a constant ignition timing). Be able to jump rope.

FIG. 2 shows the timing of generation of the ignition signal rb whose advance angle is adjusted by the second advance angle control system 1 in response to the piran-up signal S;, P2 during the discharge rotation of the engine. In the figure, t and b are the threshold levels set in the comparator 6, and 1°sb is the ignition signal)>L 1 b The ignition position V! 1'! 4 Show and do, respectively.

1); As shown in FIG. 3, the advance angle control circuit 5 uses a frequency to perform frequency-voltage * conversion of the output signal a of the operational amplifier 4 which has amplified the pickup signal output from the sensor 3. - Voltage converter 51, etc., its frequency - a time constant switching circuit 52 that can change the time constant of voltage converter 51 to make its conversion characteristics variable, and its frequency - voltage side 1: +51 output signal. an inverting circuit 5:1 for inverting the polarity of the waveform; a first ratio 1112 54 for comparing the inverted signal with the output signal 1 of the operational amplifier (:4);
A constant current discharge circuit 55 discharges the comparison output signal from the condenser at a constant current, and an ignition signal created by comparing the constant current discharge output signal with the output signal i) of the frequency-voltage conversion 1c+51 is connected to the analog switch lO. and a second comparator 56 which supplies the signal to the amplifier 11 via the comparator 56.

FIGS. 4(d) and 4()I) show examples of time charts of various signals in the advance angle control circuit 5 configured as described above.

With such advance angle control 1-'AAs2, first.

Positive pickup signal a synchronized with engine rotation
is taken into the frequency-voltage converter 51.

By inverting the polarity of the output signal (B9 and the pickup signal 1, etc.) in the first comparator 54, the waveform of the pickup signal a is shaped and a pulsed waveform shaped signal 8.c is obtained. Figure 4(a),(b)
), Ll and L2 respectively indicate the threshold values at the time of waveform shaping according to the respective engine speeds, that is, the level of the output signal in the inverting circuit 53.

At that time, by switching the time constant at 1 time constant switching circuit 52 at frequency-voltage conversion)=÷51,
It becomes possible to arbitrarily adjust the on-duty and C of the power transistor Q that performs switching on the primary side of the ignition coil IOC.

In addition, in No. 4L4 (a) and (b), the pulse signal for on-duty correction at low engine speed [C1 is the threshold] or the pulse discriminated by L2 (the one added to No.4C) is A waveform shaped signal C2 is used.The pulse (a number cl) is generated using a qt stable multivibrator, for example, according to the set time of the power transistor Q.

Next, the waveform 'I:1 type signal C output from the first comparator 54 is subjected to constant current discharge in a constant current discharge circuit 55,
The discharge (:ISJ, d) is discriminated in the second comparator 56 using the output (W'';'b of the frequency-voltage converter 51 as a threshold value), and the lead angle is calculated thereby. The off timing of Q is controlled, l
Power! - Base drive signal e of transistor Q is obtained. In the 41st fi (a), (+,), f indicates the current flowing through the ignition coil IGC due to switching of the power transistor Q in response to the input drive signal 8.

As an example, in Fig. 4(a), the engine speed is l.
000 r p When r+1, the lead angle is 4.51, the on-duty of the power transistor Q is 35%, and the characteristic is throat, and the figure () I) shows that the engine speed is 200.
At 0 rpm, the lead angle is 11'' and the on-duty of the power transistor Q is 50%.

Further, FIG. 2 shows the timing of occurrence of the ignition fit number Ta, which is advanced by the first advance angle control system 8 in accordance with the pickup signal pt during normal rotation of the engine. L @ Medium, La is 1 above! or r, 2
Tsn is the threshold level according to ignition (, ts=1
The ignition positions according to a are shown respectively.

The advance angle control circuit 5 charges the capacitor through a constant current circuit using a pick-up signal obtained in synchronization with the rotation of the engine, as has been conventionally used.
Of course, it is also possible to use a device that generates an ignition signal with a predetermined delay depending on the rotation of the engine when the charging voltage of the capacitor reaches a certain value.

1. With the engine ignition timing control device according to the present invention, during normal engine rotation, ignition timing control can be optimally adjusted according to the engine rotation, and the engine At low engine speeds, such as when starting a car, the ignition timing is adjusted to a near-constant advance regardless of the engine speed, so that the engine's ignition timing will not be affected by fluctuations in engine speed. It has the excellent advantage of being able to

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of an engine ignition timing control system according to the present invention, FIG. 2 is a time chart 1-5 of signals of various parts in the embodiment, and FIG. 3 is a progress chart in the embodiment. Block diagram showing the specific configuration of the angle control circuit,
FIGS. 4(a) and 4(b) are time charts of each part No. 13 in the advance angle control circuit. 3... Sensor 4... Operational amplifier 5... Advance angle control circuit 6.8... Comparator 7... Peak hold circuit 9... Rotation detection circuit IO... Analog switch 11...・Amplifier Δ...1st advance angle control system
B...Second advance angle control system

Claims (1)

[Claims] Advance angle control is performed according to engine rotation based on a positive signal extracted by amplifying a pickup signal synchronized with engine rotation, and the ignition signal is used to intermittent the primary current of the ignition coil. a first advance angle control system that applies the signal to the switching element; a second advance angle control system that takes out the negative polarity signal of the pickup signal and generates an ignition signal that is retarded at a substantially constant angle; Based on this, it is detected whether or not the engine speed is in a low speed range below a predetermined speed, and when the engine speed is in the low speed range, switching from the first advance angle control system to a second advance angle control system, and control system switching means for applying an ignition signal from the second advance control system to the switching element.