Ignition timing control system for industrial engines

Details Ignition timing control system for industrial engines Ignition timing control system for industrial engines

1998-03-16

1999-11-30

Argenbright, Tony M.

Internal-combustion engines

Engine speed regulator

Idle speed control

12340652, 12340656, 1234066, F02P 515, F02P 100, F02D 4108

Patent

active

059923806

ABSTRACT:
An ignition timing control system for an industrial engine or small engines used on lawn mowers, etc. is provided. In such an industrial engine, a pulser coil outputs an alternating current signal in response to movement of a magnet which rotates together with an output shaft of the industrial engine. To the pulser coil, there are connected a detecting circuit for generating a timing signal corresponding to an angle of rotation of the output shaft in response to the signal from the pulser coil, a microcomputer for determining an engine speed in accordance with the timing signal and then determining an ignition timing in accordance with the determined engine speed, and a signal generating circuit for generating a signal for controlling the timing at which a spark plug is driven by an ignition drive unit. By advancing and retarding the ignition timing, the output of the engine can be controlled with responsiveness such that the stable operation of the engine can be obtained even when the air/fuel mixture is made leaner to such an extent that will inevitably cause hunting when the engine is operated under only a throttle valve opening and closing control by a governor.

REFERENCES:
patent: 4378769 (1983-04-01), Haubner et al.
patent: 5582149 (1996-12-01), Kanno
patent: 5709193 (1998-01-01), Svensson et al.

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