Ignition timing control apparatus for internal combustion engine

Details Ignition timing control apparatus for internal combustion engine Ignition timing control apparatus for internal combustion engine

1984-11-27

1986-05-06

Argenbright, Tony M.

Internal-combustion engines

Combustion chamber means combined with air-fuel mixture...

123416, F02P 515

Patent

active

045864756

ABSTRACT:
An ignition timing control apparatus for an internal combustion engine capable of using as a fuel a regular (low-octane) gasoline, a premium (high-octane) gasoline, or a mixture of both type of gasolines. The engine produces knocks when the ignition timing is advanced beyond a reference ignition timing determined as a function of the type of gasoline being used. This ignition timing control apparatus detects the knocks, and provides as an output therefrom a signal according to the occurrence rate of the knocks which essentially indicates the type of gasoline in use. By means of this signal, this ignition timing control apparatus continuously displaces the reference ignition timing in the direction of retard angle by using a proportion factor calculator and an interpolator. At the same time, the displaced reference ignition timing is corrected by the detected knock signals on a real time basis. The combined ignition timing signal serves to energize an ignition coil to suppress the occurrence of knocks. This operation will continue until no knocks occur. Particularly, when the engine is outside of a predetermined operation region or condition, the displacement magnitude for the reference ignition timing is retained at a value of a normal operating state irrespective of whether or not knocks are detected.

REFERENCES:
patent: 3822583 (1974-07-01), Keller et al.
patent: 4243007 (1981-01-01), Ehrhardt et al.
patent: 4463565 (1984-08-01), Rydquist et al.

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