JPS6188067U - - Google Patents

Description

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram showing an embodiment of the ignition timing control device for an internal combustion engine according to this invention, Fig. 2 is a timing chart of each signal showing the operation of the above embodiment, and Fig. 3 is an ignition timing chart of the above embodiment. FIG. 4 is a graph showing the relationship between the engine speed and ignition timing of the same example as above, and FIG. 5 is a graph showing the relationship between the engine speed and ignition timing of the conventional ignition timing control device. This is a graph showing. 1b...Pulser coil, 2...Ignition circuit, 3...Ignition coil, 4...Spark plug, l...Power supply circuit, m...First sawtooth wave generation circuit, n...Second sawtooth wave generation circuit, p...Comparison circuit , q...trigger circuit, r
...Low rotation control circuit.

Claims (1)

[Scope of utility model registration request] comprising a pulse generating means for generating first and second pulse signals at respective crank angles corresponding to the maximum advance angle position and the minimum advance angle position according to the rotation of the crankshaft, the maximum advance angle position and the minimum advance angle position; In an ignition timing control device for an internal combustion engine that generates an ignition signal at a crank angle position according to the engine speed within a crank angle range between positions, the engine speed is below a predetermined speed that is lower than the idling speed. An ignition timing control device for an internal combustion engine, characterized in that the ignition timing control device for an internal combustion engine is provided with a low rotation control circuit that sets the ignition timing at a substantially constant crank angle position within the crank angle range between the maximum advance angle position and the minimum advance angle position. .