JPS5854269B2 - Internal combustion engine intermittent ignition method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ignition method that intermittently supplies power to an ignition device according to the rotational speed of an internal combustion engine after opening an ignition switch until the rotation of the internal combustion engine stops. .

As described in Japanese Patent Publication No. 49-19730, the conventional method involves opening the ignition switch and then supplying power to an ignition device for driving the internal combustion engine (hereinafter referred to as ignition power) for a certain period of time to ignite the engine. There are delay methods to prevent afterburn from occurring after the switch is opened.

However, with the above-mentioned conventional method, if the ignition switch is opened during high-speed rotation, the ignition power source may be released before the internal combustion engine reaches low-speed rotation, so there is a problem that unburned gas may be generated. be.

In order to solve the above problem, the present invention gradually reduces the internal combustion engine rotation speed by intermittently supplying ignition power to the ignition device according to the internal combustion engine rotation speed after the ignition switch is opened. An object of the present invention is to provide an intermittent ignition method for an internal combustion engine that can supply ignition power until the internal combustion engine is about to stop, thereby suppressing the generation of unburned gas as much as possible.

The present invention will be described below with reference to embodiments shown in the drawings.

First, to explain the block diagram shown in FIG.
2 is a power storage battery, 2 is an ignition switch, and 3 is an ignition device for driving the internal combustion engine, which receives an ignition signal from a distributor (not shown) and generates a high voltage to ignite the internal combustion engine. be.

Reference numeral 4 denotes an ignition power supply intermittent circuit which intermittents the ignition power supply in response to a signal from a trigger signal circuit 5, which will be described later. Reference numeral 5 designates an ignition power supply intermittent circuit 4 which receives a signal from an ignition signal detection circuit 6, which will be described later, and intermittently operates the ignition power supply according to the rotation speed. a trigger signal circuit that sends a trigger signal to 6
is an ignition signal detection circuit that detects an ignition signal from the ignition device 3.

A reset circuit 7 puts the trigger signal circuit 5 and the ignition signal detection circuit 6 into a reset standby state when the ignition power is supplied.

Next, the method of the present invention will be explained using the above configuration.

In a steady state in which the internal combustion engine is operating, ignition power is supplied to the ignition device 3 from the power storage battery 1 through the ignition switch 2, and the ignition signal detection circuit 6 and trigger signal circuit 5 are connected to the reset circuit 1. It is reset and does not work.

In this state, when the ignition switch 2 is opened, the ignition power source of the ignition device 3 is released and the reset signal of the reset circuit 7 is released, and the trigger signal circuit 5 and the ignition signal detection circuit 6 start operating.

Then, the trigger signal circuit 5 receives the signal from the ignition signal detection circuit 6.
triggers the ignition power intermittent circuit 4 once for every n ignition signals of the ignition device 3 to supply ignition power to the ignition device 3.

Here, since n changes depending on the ignition signal, n changes depending on the rotation speed of the internal combustion engine.

When the ignition power supply intermittent circuit 4 is triggered and ignition power is supplied from the power storage battery 1 to the ignition device 3, the reset circuit 7 resets the trigger signal circuit 5 and the ignition signal detection circuit 6.

Further, the ignition power supply intermittent circuit 4 is cut off once an ignition spark is generated.

Next, an embodiment of the internal detailed circuit of the block diagram shown in FIG. 1 will be described with reference to FIG. 2.

1 is a power storage battery, 2 is an ignition switch, 3 is an ignition device,
31 is an external resistance of the ignition coil, 32 is an ignition coil, 32
Reference character a designates a secondary output terminal of an ignition coil 32 connected to an ignition plug via a distributor (not shown), 33 a breaker point of the distributor, and 34 a capacitor.

4a constitutes the ignition power supply intermittent circuit 4 with a semiconductor element.

5 is a trigger signal circuit, 51 and 52 are resistors, 53 is a transistor, 54 is a resistor, 55 is a transistor, 56 is a resistor, 51 is a diode, 58 is a resistor, and 59 is a Zener diode.

6 is an ignition signal detection circuit, 60 and 61 are resistors, 62.6
3 is a diode, 64 is a capacitor, 65 is a transistor, 66.67 is a diode, 68 is a capacitor, 69
is resistance.

1 is a reset circuit, 71 to 73 are resistors, and 74 is a transistor.

Next, the operation of the above configuration will be explained.

When ignition switch 2 is closed, this ignition switch 2
Since ignition power is supplied to the ignition device 3 through the resistor 71 and the transistor 74 is conductive through the resistor 71,
The ignition signal detection circuit 6 and the trigger signal circuit 5 have been reset.

In this state, when the ignition switch 2 is opened, the transistor 74 is cut off and the reset is canceled, so that the ignition signal detection circuit 6 and the trigger signal circuit 5 are activated.

The resistor 60 and diodes 62 and 63 turn on and off the transistor 65 in accordance with the turning on and off of the breaker point 33.

When this transistor 65 is cut off, a capacitor 68 is charged by a differential circuit including a resistor 61 and a capacitor 64.

The charging voltage of this capacitor 68 is the Zener diode 5
When the Zener voltage increases to 9, the Zener diode 59 becomes conductive, the transistor 53 becomes conductive, and the transistor 55 is cut off.

When the transistor 55 is cut off, a gate current flows through the thyristor 4, which turns on and supplies ignition power to the ignition device 3.

When ignition power is supplied, transistor 74 becomes conductive, and ignition signal detection circuit 6 and trigger signal circuit 5 are reset again.

When ignition power is applied to the ignition device 3, current flows through the ignition coil 32 and breaker point 33, and when this breaker point 33 opens, a high voltage is generated on the secondary side of the ignition coil 32, causing a disassembler. 1 of the ignition coil 32 generates an ignition spark to the ignition plug via the computer.
Since a high voltage is also generated on the next side and a reverse voltage is applied to the thyristor 4a, the thyristor 4a is turned off.

When the rotational speed of the internal combustion engine becomes low, the capacitor 6
This capacitor 68
Since the charge is discharged through the resistor 69 and the capacitor voltage decreases, the number of times n of charging to trigger the thyristor 4a increases.

Further, when the internal combustion engine rotates at a low speed, the charge in the capacitor 68 is discharged before being charged again, so the thyristor 4a is no longer triggered and the rotation of the internal combustion engine is stopped.

It should be noted that the thyristor 4a will be triggered once for every n ignition signals, and n is most preferably between 3 and 5.

In the embodiment described above, the ignition signal is detected by charging and discharging the capacitor 68 to trigger the thyristor 4a, but the ignition signal is counted by a counter, and when the count value of this counter reaches a predetermined value. The cyrisk 4a may be triggered from time to time.

As described above, in the method of the present invention, the rotational speed of the internal combustion engine is detected and the degree of intermittency is changed according to this rotational speed, so the ignition ratio can be changed depending on the fuel suction condition, and the ignition can be performed intermittently. By doing so, even if the ignition switch is released with the accelerator depressed, the engine speed will gradually drop and the internal combustion engine will be stopped, and ignition power will be supplied intermittently until the internal combustion engine stops, even if the engine is under engine braking. Even if the ignition switch is turned off, ignition power can be supplied intermittently until the internal combustion engine stops, which has the excellent effect of reliably suppressing the emission of unburned gas and combustion in the exhaust pipe (afterburn). There is.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of an ignition device to which the method of the present invention is applied, and FIG. 2 is an electric circuit diagram showing an embodiment of the internal detailed circuit of the block diagram shown in FIG. 1...Battery for ignition power supply, 2...Ignition switch, 3...Ignition device, 4...Ignition power supply intermittent circuit, 5......・Trigger signal circuit, 6...
...Ignition signal detection circuit, I...Reset circuit.

Claims (1)

[Claims] 1 After opening the ignition switch to stop the internal combustion engine, intermittently supplies ignition power to the ignition device for driving the internal combustion engine at a rate of once for every n ignition signals until the internal combustion engine stops; . An intermittent ignition method for an internal combustion engine, in which the n times are increased in response to a decrease in the rotational speed of the internal combustion engine.