JPS5918272A - Capacitor charging and discharging type ignition device - Google Patents

Abstract

PURPOSE:To increase the stability of ignition characteristics by a method wherein an ignition timing is advanced polygonally in accordance with the revolving number of an engine when the revolving number of the engine is within the range of a requested set number. CONSTITUTION:A main circuit I is constituted so that the charged charge of a capacitor 13, being charged by the generating voltage of a generator coil 10 rotated by the engine, is discharged when a thyristor 12 is conducted to generate spark in a spark plug 15 through an ignition coil. A saw tooth wave generating circuit II, generating a wave form voltage, whose peak value is varying in accordance with the revolving number of the engine, a voltage generating circuit III, generating a voltage, synchronizing with the revolution of the engine and whose peak value is varying uncontinuously, and a comparating circuit IV, comparing both of the voltages, are provided so as to correspond to the main circuit I . The gate of the thyristor 12 is put ON by the output of the comparating circuit IV through a gate circuit V.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a capacitor charge/discharge type ignition device.

In Patent Application No. 140903 filed in 1982, the ignition timing (angle) is adjusted according to the increase in engine speed (in proportion) when the engine speed is within the required set number range, in order to match the output characteristics of the engine. A low-cost and economical ignition system that can obtain ignition angle characteristics that advance the ignition angle (angle) was clarified.

One embodiment of this ignition device uses a sawtooth wave generation circuit whose peak value changes in accordance with the engine rotation speed, and a sawtooth wave generation circuit whose peak value changes in accordance with the engine rotation speed. A comparator circuit for comparing generated sharp edge shock waves having a substantially constant inclination angle and peak value, and a gate circuit for turning on the gate of the thyristor based on the output of the comparator circuit are provided. According to this cited invention.

The engine's ignition characteristics have been significantly improved, achieving greater stability and precision. However, in the cited invention, since the ignition timing advances linearly in proportion to the increase in engine speed, depending on the type of engine, the engine speed does not increase smoothly and a so-called knocking phenomenon occurs, or exhaust gas regulations are not met. There are drawbacks such as not being satisfied. The present invention advances the ignition timing one step linearly in accordance with the increase in rotational speed by one step, and provides a Hundenza charging M1 type ignition device in which the ignition characteristics are significantly stabilized.

The present invention will be described in detail below using the drawings. Figures 1, 2, 3 and 4 are a circuit diagram of an embodiment of the present invention, an operation waveform diagram of each part thereof, a voltage waveform diagram for explaining the operation, and an ignition characteristic diagram, respectively. 11 is a rectifying diode; 12 is an ignition power supply capacitor 1 charged via the diode 11 by the voltage generated by the generator coil 100;
Reference numeral 3 denotes a thyristor which is made conductive via a gate circuit which will be described later.This thyristor discharges the charge in the capacitor 12 to the ignition coil 14, and generates a spark in the ignition plug 15 via its secondary winding 14-2. . Further, 18 is a short-circuiting diode for short-circuiting the output of 1 when the reverse current prevention voltage has a polarity opposite to that shown in the figure. Configure main circuit I at the beginning. Next (this, 20 (1). Also, I
, I, ■, ■ are the control circuits of the main circuit section ■, 1 is a sawtooth wave generation circuit that generates a waveform voltage whose peak value changes in proportion to the engine speed, and the seal is the engine. A circuit that generates a voltage whose peak value changes discontinuously in synchronization with the rotation of the circuit. Ig is a gate circuit that turns on the gate of the thyristor 13, Ig is a switching circuit that turns on and off in synchronization with engine rotation, and Wb
is a power supply section for driving the control circuit section. First, the power supply section Ilb is formed of a diode 36 that rectifies the output voltage of the generator coil 10, a capacitor 3B that is charged by the rectified output via a resistor 37, and a constant voltage element 391 that charges the capacitor 38 with a constant voltage. ing. Next, in the shock wave generation circuit 11c, 24 is the capacitor 3.
A capacitor is charged with the required time constant with a resistor 25 using the daily charging voltage as a source W4, and 26 is a transistor connected across the capacitor 24 via a resistor 27.28, and the transistor 26 is connected to the engine rotation. It is made conductive by the synchronized output signal voltage of the pulser coil 20, thereby forming a discharge circuit for the capacitor 24. In addition, 32
32g and 31, 31@ are a capacitor and a resistor for absorbing signal voltage noise, and 34 is a rectifying diode, which together form a circuit (2).

Next, 71 is a switching transistor that is turned on and off via an auxiliary transistor 72 which is made conductive by the output signal ζ of the pulse filter 20, and when the transistor 71 is on, it supplies the charge of the power supply capacitor 38. . The circuit 1a is thus formed.

Next, 41 is a capacitor 43, which is charged via a diode 42 when the transistor 71 is on.A voltage divider transistor 45 divides the drive power supply voltage. This transistor is connected to the power supply voltage and is made conductive by the power supply voltage to charge the capacitor 46 to the divided voltage of the voltage divider. The capacitors 46 and 41 are a resistor RB and a transistor Q.

The capacitor 46 is charged with the time constant of the resistors RA, R, B and the transistor Q using the capacitor 41 as a power source.

Note that Q++; i transistor Q.

This is a control transistor. With the above steps, the circuit section is formed. Reference numeral 51 denotes a transistor forming the comparison circuit 2, whose emitter is connected to the output terminal (point (D)) of the circuit section, the base is connected to the output terminal (point (D)) for the circuit, and the collector is connected to the comparison output terminal (point (D)). It is connected to the gate circuit (2) via a resistor 52.

Next, reference numerals 61 and 62 are amplifying transistors, and the transistor 61 is made conductive by the output of the comparator circuit (2), thereby making the transistor 62 conductive. Then, due to the conduction of the transistor 62, the thyristor 13 is connected to the capacitor 41.
It is supplied with gate current and turns on (conducting).

Next, the circuit operation of the device of the present invention will be explained with reference to FIGS. 2 and 3M. It is assumed that the pulsar coil 20 generates positive and negative signal voltages at preset ignition timings (angles).

First, at the engine speed N shown on the horizontal axis in Figure 4, N1
-N3 is the set range of rotation speed, N.

~N1 is the rotational speed that does not reach the set range, and N3 or more is the rotational speed that exceeds the set range. When the polarity of the generating coil 10 is on the upper side or Φ as shown in FIG. And when the polarity of the coil 10 is opposite to the above (the upper side is e)
In this case, the capacitor 12 is blocked by the diode 11 and is not charged, and the charge during the first half cycle does not form a discharge circuit and maintains the charged state shown in the figure. When power is supplied to the gate of 13 and the thyristor 13 is turned on, the charge in the capacitor 12 is discharged to the ignition coil 14 via the iris iris 13, and a spark is generated at the ignition plug 15 at the standard ignition timing (angle). to make you angry. Figure 2A shows the signal waveform of the pulsar coil 20, where (1) is a positive signal at the maximum (angle) advanced position from the ten point of the engine (not shown), and (2) is the positive signal at the minimum advanced position 1. The positive and negative signals indicate the negative 4N signal in the engine (
flywheel) occurs once per rotation. Further, when the 11 side of the generating coil 1o is at ■, the converter 38 is charged with a constant voltage via the timer 36, the resistor 37, and the constant voltage diode 39 (FIG. 2B). Also, Conan±24
is a resistor 2 using the voltage of the condenser 38 as a power source.
The vertical box with 5 is charged with a time constant of 1 (Diagram 2 E).

On the other hand, when the upper side of the pulser coil 20 is e (stop signal), the transistor 71 is turned on via the transistor 72. Therefore, during the ON period of the transistor 71, the charge of the capacitor 38 is supplied to the circuit layer. That is, the phototransistor 45 conducts and charges the capacitor 46, but the voltage of the capacitor 46 is transferred to the voltage divider 43.4.
Limited to 40 minutes voltage. On the other hand, the capacitor 41 is charged to the set electron level via the diode 42 (Fig. 2C
). Therefore, the charging voltage of the capacitor 41 is higher than that of the capacitor 46. and transistor Q
, is in a non-conducting state, the capacitor 46 is connected to the resistor RA.
, RB charging time (charged by y, and transistor Q
! When is in a conductive state, it is charged by the time constant of transistor Q and resistors R and A. That is, since the control transistor Q is previously set to a non-conducting state when the voltage of the capacitor 46 is low, the capacitor 46 is initially connected to the resistors R, A, and R.
, B and the time constant. Then, when the charging voltage of the capacitor 46 reaches a predetermined value (a voltage at the point o), the transistor Q becomes conductive.

becomes conductive and short-circuits the resistor RB, resulting in a con. For this reason, the capacitor 46 acts slowly until the transistor q becomes conductive, and after it becomes conductive, it becomes pure (discontinuous).
(Fig. 2 D) Therefore, when the engine speed does not reach the above setting range (between No. and N1 in Fig. 4), the output peak of circuit The head voltage, that is, the voltage of the capacitor 24 (point) is set in advance to be higher than the output voltage of the circuit (2), that is, the voltage of the capacitor 46 (point). The operation of each comparison circuit (2) and each gate circuit will be explained below with reference to FIG. Figure 3? Here, No. 4,000 N33 is the engine rotation speed, Eo ~ E6
are the N1 pressure (sawtooth) waveforms of the condenser 24, and 1-7 are enlarged views of the pressure waveforms of the capacitor 46. At the above rotational speed (between NO and N1), the sawtooth waves F! 0-E
Both peak values of 2 are higher than the voltage ff)), and the transistor 51 is reverse biased and in the off state.

Therefore, a negative signal is applied to the Pal blade coil 2o (Fig. 2A (2
When 1) occurs, the transistor 26 of the circuit H becomes conductive, and the capacitor 24 becomes lt resistor 27→transistor 26 (
collector-emitter) path, and its potential decreases. Therefore, when the negative signal arrives, the transistor 51 becomes conductive, turning on the transistors 61 and 62 of the gate circuit (2). For this reason, [capacitor 6
1→transistor 62-4 gate of thyristor 13], a gate current flows through the red path, turning on the thyristor 13. In other words, the pulsar coil 2
The arrival of the negative signal of 0 is accelerated, and a discharge circuit is formed in the capacitor 24 via the transistor 26 each time the signal arrives, so the peak value changes as shown in FIG. 3 from EO to E1 to E2. (descend. On the other hand, since the charging time constant of the capacitor 46 through the transistor 45, the resistors RA and RB, and the transistor Q2 is set to be extremely short compared to that of the nuclear capacitor →124, regardless of changes in the engine speed, the (Between N O and N1) Even though the peak value of the output sawtooth wave of the Teha circuit 1t changes, the comparison circuit ■ gates the output every time a negative signal set at a predetermined angle of the pulser coil arrives. As a result of the transmission, as shown in characteristic (8) in FIG. 4, at the minimum ignition timing of a certain angle, the capacitor 12 discharges and generates a spark. Note that FIG. 2F, () shows the Mi and pressure waveforms at the middle point (1'l and 0) in FIG.

γ when the engine rotation area exceeds the setting point, the limit, and this
When the SL1 operation reaches 45F, the engine speed further increases and exceeds the speed N1, the peak voltage of the capacitor 24 decreases as shown in E3.1 to 4 of FIG. Therefore, in the comparator circuit 1v, the point σ>l m, the pressure is at the point (I))■,
The time when it reaches 1F is %I, and the temperature of the transistor 51 is 7.
The tracking time will be faster. That is, in the above operation, the pulsar coil 20
The transistor 51 was conductive at the time (angle) when the rotation hN1 of 1] was generated, but before the pulse blade fill 20 generated a negative signal after the rotation hN1, -
It becomes conductive at an angle of 8.0°. In other words, between the rotational speeds N and -N, the si risk is 1 depending on the increase in engine speed of -F + 72.
3's ignition timing is early, especially up to the rotation speed N.
The rotational speed is advanced by v between the rotational speed N and N8.

(4th lb) Furthermore, when the rotational speed N exceeds, that is, the rotational speed deviates from the set range, the capacitor 24 is connected to the capacitor 24 through the resistor 25 because the frequency of forming one lightning circuit through the transistor 26 becomes higher. The voltage rise becomes more gradual (E5, E6 in FIG. 3). Therefore, the capacitor 2
4 voltage (point))) is the voltage of capacitor 46 (point)))
It will always be lower. On the other hand, since the voltage of the capacitor ( ) 46 is generated every time a positive signal arrives at the pulser coil 20 (every time the transistor 71 is turned on), in the comparison circuit That is, tlc3
As a result of sending out the output at the drawing angle r e s, the characteristic shown in Figure 4 (c
), at the maximum ignition timing of a certain angle, →J iristor 13 becomes conductive and generates a spark. In the above embodiment, in circuit I, resistors R, R, B and transistor Q1
We have explained an example in which a child chain ← 2-resistor circuit is formed by using the above method, and this generates a bent voltage that bends inward due to the charging time constant with the capacitor 46. You can also do it. Figure 5 (Circuit diagram of another embodiment of Sengu circuit I and (C) Charging of capacitor 46 ■ Pressure waveform diagram shows capacitors 46 and 41 connected to a series circuit of diodes 48, 49 and resistors RB, and resistors R and A. They are connected through a parallel circuit. With this configuration, the voltage and voltage of the capacitor 46 (
Point D) is initially connected to the capacitor 46, the parallel resistances of resistors R, A and R, B, and T3. Since the time constant (r/''''' R, A+RB) of @R,B increases, - rises rapidly and when the 0 point voltage reaches the 11 point voltage -VD (Fig. 5 b, a), the resistance R no longer increases. , charging through B,
The time constant (TN Mamoru, R, A
) to charge the battery. For this reason, the rise of the voltage becomes gradual, and a charging characteristic with an outward bend as shown in FIG. 5(b) of PA5 is obtained. As is clear from the above explanation, the present invention has two main points: 1. The ignition timing of the engine is adjusted to the rotational speed; Since it is possible to freely change the angle of the engine, it is possible to shift the angle according to the angle of the engine. The effect of 1 is extremely large.

[Brief explanation of the drawing]

1 and 2 are a circuit diagram of an embodiment of the present invention and operation waveform diagrams of each part thereof, FIG. 3 is a detailed explanatory diagram of the present invention, FIG. 4 is a characteristic diagram of the present invention, and FIG. 5 (al( b) is another embodiment diagram and a charging characteristic diagram of the present invention. In the figure, 1 is a main circuit, 1 is a sawtooth wave generating circuit I is a discontinuous voltage generating circuit, 2 is a comparison circuit, 2 is a gate circuit, 12
．． 24.38.41.46 is capacitor% 13 is thyristor, 11,42.48.49 is diode, Igt
is ignition coil, 39 (i constant voltage 1 voltage element, 43
．． 44 is a voltage divider, 26.45°51.6], 62.71
．． 72 is a transistor, 25 and ILA, and 13 are resistors. Patent applicant Shindengen Kogyo Co., Ltd. No. 20 Figure 3 ¥4 Figure (A> Jun S Figure

Claims (1)

[Claims] The condenser is charged by the voltage number of the generator coil. a main circuit that discharges the charge of the capacitor through a thyristor to discharge one ignition coil; a sawtooth wave generating circuit whose peak value varies in accordance with the engine speed;
A comparator circuit that compares the sawtooth wave and the voltage on a voltage generating circuit whose peak value changes discontinuously in synchronization with engine rotation, and a gate circuit that turns on the gate of the thyristor based on the output of the comparator circuit. 1. A capacitor charging/discharging type ignition device comprising: a capacitor charging/discharging type ignition device, characterized in that, when the engine speed is within a predetermined set number range, a polygonal advance ignition characteristic is obtained according to the engine speed.