Ignition circuit for a two-stroke engine

Details Ignition circuit for a two-stroke engine Ignition circuit for a two-stroke engine

1989-08-03

1990-12-25

Argenbright, Tony M.

Internal-combustion engines

Engine speed regulator

Engine speed reduction by partial or complete omission of...

123339, 123418, F02P 5145, F02D 4300

Patent

active

049794779

ABSTRACT:
The invention is directed to an ignition circuit for an internal combustion engine such as a two-stroke engine of a handheld, portable tool such as a motor-driven chain saw or the like. The engine has a cylinder and a piston conjointly defining a combustion chamber and a crankshaft connected to the piston. The ignition circuit includes a spark plug mounted in the cylinder and voltage source. A switch is actuable between an on-condition wherein the voltage source is connected to the spark plug for initiating a spark in the chamber and an off-condition wherein the voltage source is disconnected from the spark plug. An electronic control circuit actuates the switch between the two conditions in dependence upon the angular position of the crankshaft and other operating parameters of the engine such as the engine speed. The electronic control circuit includes a high-speed control circuit and an idle-speed control circuit for determining the firing time in the control range of the idle speed.

REFERENCES:
patent: 4344397 (1982-08-01), Geiger et al.
patent: 4389989 (1983-06-01), Hartig
patent: 4459951 (1984-07-01), Tobinaga et al.
patent: 4552109 (1985-11-01), Baccadoro et al.
patent: 4633832 (1987-01-01), Andreasson et al.

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