Ignition timing control system for internal combustion engines

Details Ignition timing control system for internal combustion engines Ignition timing control system for internal combustion engines

1991-12-24

1992-11-17

Nelli, Raymond A.

Internal-combustion engines

Charge forming device

Fuel injection system

F02P 500

Patent

active

051634031

ABSTRACT:
An ignition timing control system for an internal combustion engine in which an ECU sets a basic spark advance value in response to operating condition of the engine, corrects the set basic spark advance value, and delimits the corrected spark advance value in a spark retarding direction by means of a retard limiting value. The ECU further detects operating conditons of a valve timing changing system which changes the valve timing of at least one of an intake valve and an exhaust valve of the engine, and is responsive to the detected operating conditions of the valve timing changing system for changing the retard limiting value, e.g. in such a manner that when low-speed valve timing is selected, the retard limiting value is changed toward an advanced side relative to a value thereof set when high-speed valve timing is selected.

REFERENCES:
patent: 4437442 (1984-03-01), Yamaguchi
patent: 5000150 (1991-03-01), Miyaura et al.
patent: 5003950 (1991-04-01), Kato et al.
patent: 5014669 (1991-05-01), Takasaki et al.

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