JPS5923067A - Capacitor charging and discharging type ignition device - Google Patents

Abstract

PURPOSE:To prevent a kick-back phenomenon from occurring, by a method wherein a gate signal is outputted at the times of the leading edge and the trailing edge of a negative signal from a pulsing coil, and a preset ignition timing is further delayed at the time of starting. CONSTITUTION:A capacitor 41 is charged through transistors 72, 71, and is discharged by a transistor 62. A time constant for the combination of a resistor R and a capacitor C is set to be shorter than the rise and fall time of the pulse, the voltage of the capacitor C is raised by the capacitor 41, and reaches to the voltage Vz of a constant-voltage diode ZD at the time of low-speed operation, so that a transistor 61 remains in a non-conductive state. When the negative signal from the pulser 20 rises after a required period of time, a transistor 26 is turned OFF, and the voltage 24 of a capacitor is raised, after which a transistor Q1 is turned OFF. Accordingly, since the ignition timing is retarded at the time of starting, the kick-back phenomenon can be prevented from occurring.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a single type ignition device capable of charging and discharging a capacitor.

1981! ￥'f Revised Application No. 140'1 CIB adjusts the ignition timing (angle) to suit the engine output 11.
When the engine speed is within the required set number range, the ignition timing (angle IE, ) is advanced (proportionally) according to the upper row of the tachometer, and when the engine speed is below or above the range, the ignition timing (angle IE, ) is advanced (in proportion) A low-cost and economical ignition device capable of achieving constant minimum ignition angle and maximum ignition angle characteristics has been revealed. In one embodiment of this ignition device, 11, the positive pulse signal of the pal hino coil (
The maximum ignition angle characteristic is obtained in synchronization with the rise and fall of the pressure (1 pressure), and the minimum ignition characteristic is also obtained in synchronization with the rise of the dog pulse signal).
However, this ignition characteristic, that is, the ignition timing, is set before the top dead center of the engine, so in special cases such as when the rotation speed is below the set range, the piston cannot go beyond the top dead center after ignition. There was a problem with the cap, which is dangerous because it causes the so-called care-tin phenomenon in which the piston is pushed back. In view of the above points, the present invention provides an ignition device that can obtain stable ignition characteristics particularly in a low rotation range such as when starting an engine. The present invention will be described in detail below using the drawings. 1st
2 and 3 are circuit diagrams 1 of one embodiment of the present invention, respectively.
, each part thereof has a power generating coil such as a magnetic generator that rotates by operating waves, 11 is a rectifying diode, 12 is the generator 1,
Charged via the diode 11 due to the voltage generated by the coil 10? [B. The ignition power supply capacitor 74'a is a thyristor that conducts through a gate circuit to be described later, which discharges the charge of the capacitor 12 to the ignition coil 14, and the second winding 14-a. 2 through spark plug 15
Generates one spark. In addition, the diode 18 is a diode for preventing backflow from the external terminal 21, and the diode 18 is a diode for preventing backflow from the external terminal 21.
9 is the output 1 of the generator 11f5 coil 1o (L pressure is 4i shown in the figure)
This is a short-circuit diode that short-circuits the output when the polarity is opposite to that of the output. The following constitutes the main circuit I. Next, 2o is an ignition signal generating coil (hereinafter referred to as a pulsar coil) that generates a signal voltage at a predetermined ignition angle. In addition, summer, ■, ■ are the control circuit sections of the main circuit section 1, summer is a sawtooth wave generation circuit, the seal is a shock wave generation circuit, ■ is a comparator, ■ is a gate circuit, Ia is a switch circuit,
Ib is a power supply section, (2) is a retardation circuit which forms the main part of the present invention) and C forms a resistance-effect frequency (rotation speed) detection circuit for setting a time constant. next. 5, Q is a control transistor, T1. , , (-), , are the resistors and capacitors forming the differential circuit, Dill,
4. This is an iode for Kl stop river. Thus, +i4 control M11 circuits are constructed. Next, the 1611 work will be explained with reference to FIGS. 2 and 3. In addition, the above circuit! 〜Vli
It is the same as the previously proposed circuit (Japanese Patent Application No. 56-140903), and its operation is left to the user (when the engine speed does not reach the set range (Fig. 3 N, below), the pulsar coil 20
In the positive period (No. 21'\Ia-■), No. 48 of
The output VIt pressure of the circuit ■, that is, the voltage of the capacitor 24 (note)) is set in advance by the output voltage R11 of the circuit ■, that is, the voltage of the capacitor 46.
Since it is set to be higher than the point (1) l of the ratio i1i+, the transistor 51 of the circuit (2) is reverse biased and is in an off state. Therefore, pulsa coil 2
When a negative signal (Fig. 2 a-■) is generated at o, in synchronization with the rising edge of the signal, the transistor 26 of circuit
Then, the capacitor 24 is discharged through the transistor 26, and the voltage decreases by about 11 degrees. Therefore, at the time when the above negative signal arrives, the transistor 5 becomes; jI-3
171, the transistors 61 and 62 of the gate circuit V are turned on, and a gate current flows through the path from the capacitor 41 to the transistor 62 to the gate of the thyristor 13, turning the thyristor 13 on. Therefore, the comparison circuit (■) sends an output (Fig. 2 f-■) to the gate in synchronization with the rise of the negative 1 signal set at a predetermined angle of the pulsar coil, resulting in the minimum ignition timing at a constant angle set by the negative pulse. (−
0°), the capacitor 2 is exposed to i11. L fire θ Makes 4 flowers. (Fig. 3 (a)) Also, when the engine speed is within the set range (N, -N, in Fig. 3), the voltage from condenser to J-24 decreases as the engine speed increases by -L,
In comparison circuit ■, point (g)) 1a, pressure is point (1)
) The timing when the current becomes below the ratio is earlier, and the transistor 51
conduction time becomes earlier. That is, in the above operation (when the copulsar coil 20 generates a negative signal), the transistor 51 conducts at υ1 (angle), but when the setting circuit exceeds Nl, the thyristor 13 is ignited in proportion to the increase in engine speed. The timing is earlier, and the ignition timing is earlier. jZuro. (3rd
(Fig.Q)) Furthermore, when the rotational speed N exceeds the set range, the capacitor 24 becomes even higher in the discharge circuit forming force through the transistor 26, so that the voltage rises in the upper series through the resistor 25. 26 becomes even more gentle, and the pressure (point 0C) of the condenser →J24 is always lower than the pressure (point (r)l) of the condenser 46.

On the other hand: J'ndensai 6's? 1 is the pressure of pulsar coil 20
Since a positive signal is generated every time the transistor 71 is turned on, the comparator IV generates a positive signal every time the transistor 71 is turned on. At the large ignition timing (i=, ), the →no-irrisk 13 becomes conductive and generates a spark.

The present invention is characterized in that the predetermined minimum angle point of the pulse→J-coil l<[1;1. ' period (=1 season) is further retarded at the time of starting, etc., making it possible to ignite the ignition timing near top dead center or at a minus angle beyond top dead center, thereby eliminating the problem of sagging during starting. It is made by 1 strain. The present invention has a function of sending out a gate signal in synchronization with the falling timing of the negative pulse of the pulsar coil.In contrast to the conventional signal synchronized with the rising edge, the ignition angle 411 can be changed using the delay of the pulse. It is characterized by: Circuit (2) will be explained below. First, in Figure 3, N, ~N,
Let l be the starting rotation speed. Circuit ■ Condenser 1J41
is charged during this period through the transistors 72 and 71 which are made conductive by the positive pulse of the pulser coil 2o (FIG. 2a), and the transistor 62 is charged by the positive pulse (FIG. 2a). The load is held until one circuit is formed. Therefore, in the conventional circuit, when the rotation speed is below the set range (N in Figure 3) (lower than J negative pulse) - As a result, one transistor 51 is turned on, and as a result, the transistor 62 becomes conductive, so the capacitor 41 (
J Figure 2 1) Holds the charge for the time indicated by the dotted line.

On the other hand, the time constants of the resistor R and the capacitor C are set in advance to be shorter than the time from the rise of the positive pulse to the rise of the negative pulse (:+'<b-tb in Fig. 2).

Therefore, the voltage of the capacitor C increases by turning on the capacitor 41, and becomes constant 'rπ before the negative signal pulse rises.
The 21st voltage that reaches the tuner voltage Vz of the piezoelectric diode ZJ)
・klc) Control transistor. Pass 1 through 2 tsuba. Therefore, the ignition signal applied to the base of the transistor 61 through the transistor 51 at the rising edge of the negative pulse is absorbed into the control transistor Q1 and remains non-conductive. Therefore, the 1 (1) load of the capacitor 41 is not applied to the Zyristor 13 and is maintained even after time tb as shown in FIG.
9 signal of 0 is 1L%1lilj t a 71, falling, this is 1, i: More and more the transistor 26 turns off,
The 111 voltage of the capacitor 24 is in the upper row. (Fig. 2 d) This 'i15, river is differentiated and controlled by the capacitor c1; it is given to the transistor Qt for Ill (Fig. 2 e) N
Transistor Q is momentarily turned off via transistor Q. For this reason transistors. .

Is the ignition signal absorbed by transistor 61? As a result, the electric current 1 is discharged through the transistor 62, and the gate signal 131 is output. In other words, in Fig. 3, in the conventional example, the ignition signal was given at the rotation speed N and the ignition angle was always 0 (dotted line a), but in the present invention, the ignition signal was given at the rotation speed at the time of starting (N e to N1').
The ignition angle is retarded by (fa) during the negative signal pulse,
In other words, as shown in the middle line (d') in Figure 3, the position is closer to the top dead center (
The ignition signal is applied at an angle close to θ°) or at an angle (-e) beyond the dead center as shown in (d) (FIG. 2f).

Next, the engine speed increases, and as a result, the time constant of one resistor R capacitor C becomes the pulse at point E [1j(t b ) J
If it becomes longer, the voltage of capacitor C (V z ) becomes lower. (Fig. 2 C) Therefore, the control transistor Q is always off and does not absorb the ignition signal, and a signal is sent out at the rising edge of the negative signal (Fig. 2 f), that is, the rotation speed NI'~
During N1, ignition is performed at the set ignition signal angle at the rising edge of the negative signal as before. 1) The present invention sends a gate signal at the rise and fall of the negative signal of the pulsar coil, thereby changing the conventional negative signal from the rise to iv+,
! :L, taj((This is one in which the angular ignition characteristics are further varied.

In the above embodiment, an example in which the present invention is applied to an already proposed circuit has been described.
k! : li'7. It is clear that this can be applied.

As is clear from the explanation given below, according to the present invention, stable ignition characteristics are achieved especially in the engine speed rotation range.
The practical effect (-I is extremely large).

[Brief explanation of drawings]

1, 2 and 3 are circuit diagrams of an embodiment of the present invention,
The active part operation waveform diagram and 'F', j tl l:)l. In FIG. 1ζ, I lj main circuit, n If sawtooth θ/A wave generation circuit, ■ is opposite 1 jll wave generation circuit 5 ■ is 11:
The sacred treasure, ■ is the gate circuit, and ■ is the delay circuit.

Claims (1)

[Claims] The main circuit charges a capacitor with the voltage of the ignition 11C coil and discharges the charged charge of the capacitor to the ignition coil via the thyristor, and the control circuit turns on the gate of the thyristor using a signal from the pulse coil. A capacitor charging/discharging type ignition device characterized in that the control circuit has a circuit that sends out a gate signal in synchronization with the rising edge of the pulse of the pulser coil, and a circuit that sends out a gate signal in synchronization with the falling edge of the pulse of the pulser coil. Rechargeable and dischargeable ignition device.