JPH0247263Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an ignition circuit for an internal combustion engine for an automobile.

Conventionally, in the ignition circuit of an automobile internal combustion engine,
A vibration pulse is generated by combining an oscillator and a capacitor discharge type ignition circuit, and as shown in Fig. 1, this is boosted to a high voltage by the ignition coil 1, and a continuous spark discharge is caused by the spark plug. Capacitor discharge type ignition circuits for automobile internal combustion engines are known. In such a continuous spark discharge type ignition circuit, as shown in FIG.
The same vibration waveform as point is also output to point B on the high voltage side of ignition coil 1, and the direction of the current alternately changes between positive and reverse, so the discharge at the spark plug temporarily stops each time the direction changes. . Such a temporary interruption of discharge stops the growth of the flame kernel within the cylinder, resulting in a significant reduction in flame propagation, which has the disadvantage of causing ignition errors.

This invention is an attempt to eliminate such drawbacks found in conventional capacitor discharge type ignition devices for automobile internal combustion engines. The technical measure taken for this purpose was to connect a full-wave rectifier circuit between the high-voltage side output terminal of the ignition coil of a capacitor discharge type ignition circuit equipped with an oscillator and the discharge poles. That's true.

With such technical means, the high-voltage oscillating current generated on the high-voltage side of the ignition coil is full-wave rectified by the rectifier circuit and becomes a current in the same direction, thereby eliminating pauses in discharge.

A preferred example of this invention will be described below with reference to FIGS. 3 and 4. In the figure, 10 is an ignition coil of a capacitor discharge type ignition circuit having an oscillator, and a rectifier circuit 11 is connected to the high voltage side of the ignition coil. The rectifier circuit 11 is not limited to the bridge circuit shown in the figure, but may be any full-wave rectifier circuit that rectifies the negative side of the vibration waveform to the positive side.

A large capacity capacitor 13 is connected between the output terminal 12 of the rectifier circuit 11 and the spark plug, which is a discharge pole.
Connect in parallel.

The oscillating current (A in FIG. 4) output between the high voltage sides a and b of the ignition coil 10 is transmitted to the rectifier circuit 1.
1, the currents are full-wave rectified and flow in the same direction as shown in FIG. 4B. Furthermore, by passing this through a large capacity capacitor 13, a continuous current waveform is obtained in which the pauses between current waves are filled in, as shown in FIG. 4C. Note that the use of the capacitor 13 is not necessarily required. Also, when using the capacitor 13,
Although the current waveform itself is slightly reduced, the reduction is actually negligible.

As described above, according to the capacitor discharge type ignition circuit for an automobile internal combustion engine of this invention, a full-wave rectifier circuit is connected between the high-voltage side output terminal of the ignition coil and the discharge poles, and the oscillating current is full-wave rectification,
Since the current is input to the discharge poles as a current in the same direction, there is no temporary pause in the spark discharge as in the conventional case, and the growth of the flame kernel is not inhibited, thereby reducing flame propagation. This eliminates the possibility of ignition errors occurring.

[Brief explanation of drawings]

FIG. 1 is a conventional ignition circuit diagram, FIG. 2 is a graph showing a conventional current waveform, FIG. 3 is an ignition circuit diagram according to this invention, and FIG. 4 is a graph showing a current waveform according to this invention. 10... Ignition coil, 11... Rectifier circuit, 12... Output end, 13... Capacitor.

Claims (1)

[Scope of utility model registration request] An ignition circuit for an internal combustion engine for an automobile, characterized in that a full-wave rectifier circuit is connected between a high voltage side output end of an ignition coil and a discharge pole of a capacitor discharge type ignition circuit having an oscillator.