JPS6253708B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ignition system for an internal combustion engine that detects engine knocking and delays ignition timing when knocking occurs.

A conventional device of this type is shown in FIG. In FIG. 1, reference numeral 1 denotes a signal generator installed in a power distribution device (not shown). It includes a pickup coil 1b that generates. Reference numeral 2 denotes an electric circuit of an ignition timing control device that processes and outputs an ignition signal.
It includes a delay control circuit 2b which delays the output in proportion to the magnitude of the output of d, and an output circuit 2c which outputs the controlled ignition signal to the outside. In addition, output circuit 2
c is connected to an ignition coil (not shown). 4 is a knocking detector attached to the engine 3, and this knocking detector 4 is, for example,
The device detects the vibrations of the vibrations or the sound waves generated by these vibrations and converts them into electrical signals.

Next, the operation will be explained. When the crankshaft of the engine 3 rotates, the signal rotor 1a rotates in synchronization with the crankshaft of the engine 3, causing the pickup coil 1b to generate an ignition signal. The ignition signal generated at the pickup coil 1b is converted into a rectangular wave by a waveform shaping circuit 2a. On the other hand, the signal detected by the knocking detector 4 is transmitted to the knocking discrimination circuit 2d, outputted to the delay control circuit 2b, and outputted to the outside from the output circuit 2c. When knocking does not occur in the engine 3, the delay control circuit 2b does not operate, and the signal output from the pickup coil 1b is output directly from the waveform shaping circuit 2a to the output circuit 2c to adjust the ignition timing. It is determined.

In a conventional ignition system for an internal combustion engine, a pick-up section built into a power distribution device, the electric circuit section, and a knocking detector are each constructed separately, making the device complex and requiring wiring to connect each. In order to protect the device from the effects of disturbance noise, it is necessary to use shielded wires, which has the disadvantage of making the device expensive.

This invention attempts to eliminate the drawbacks of the conventional devices as described above, and by integrally providing the entire device in the power distribution device, it simplifies the device and minimizes the influence of disturbance noise. The purpose is to provide an inexpensive ignition device that can be used.

An embodiment of the present invention will be described below with reference to FIG. In FIG. 2, reference numeral 1 indicates a signal generator provided in the power distributor, 11 indicates a rotating shaft rotated by the engine 3, and a signal rotor 1a is attached to this rotating shaft 11. 1b is a pickup coil, 2 is an electric circuit of an ignition control device similar to the conventional one described above, and 4 is a knocking detector, which are screwed or press-fitted into the housing 12 of the power distributor. Detects vibrations or sound waves generated by vibrations.
Note that the engine 3 has a housing 12 fixed integrally thereto.

The ignition system of one embodiment configured as described above transmits vibrations caused by knocking of the engine 3 to the knocking detector 4 through the housing 12 of the power distributor.
to be communicated to. The signal output from the knocking detector 4 operates in the same manner as the conventional device described above.

In the above embodiment, the knocking detector 4 is provided on the power distribution housing 12, but in the present invention, the knocking detector may be provided on a plate for attaching the housing to the engine.

As explained above, according to the present invention, the knocking detector, the signal generator, and the electric circuit that controls the output of these devices are integrated with the housing of the power distributor, so the device can be made simple and inexpensive, and the disturbance nozzle can be reduced. The impact of this can be minimized.
Further, although the knocking detector is integrally provided in the housing of the power distributor, since engine vibrations are transmitted to the housing, knocking can be detected as well as in the prior art.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing a conventional ignition system for an internal combustion engine, and FIG. 2 is a cross-sectional side view of essential parts showing an embodiment of the present invention. 1...Distributor, 1a...Signal rotor, 1b
... Pickup coil, 2 ... Control electric circuit, 3 ... Engine, 4 ... Knocking detector,
12...Housing. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A housing of a power distribution device that is integrally attached to the engine, a signal generator that is integrally provided to the housing and generates an ignition signal at a predetermined ignition timing depending on the state of the engine, and a signal generator that is integrally attached to the housing. a knocking detector that is attached to the housing and detects vibrations of the housing or sound waves generated by the vibrations; and a knocking detector that is integrally attached to the housing and delays the ignition timing by the signal generator by a predetermined amount based on the output signal from the knocking detector. 1. An ignition device for an internal combustion engine, comprising an ignition timing control device, and controlling the amount of knocking to be below a certain value.