Failsafe method in connection with valve timing-changeover...

Details Failsafe method in connection with valve timing-changeover... Failsafe method in connection with valve timing-changeover...

F - Mech Eng,Light,Heat,Weapons

01

L

123/183

F01L 1/34 (2006.01) F01L 1/26 (2006.01) F02D 41/26 (2006.01)

Patent

CA 1331118

ABSTRACT OF THE DISCLOSURE A failsafe method in connection with valve timing-changeover control for an internal combustion engine. An abnormality in a control system of the engine is detected. A changeover-instructing signal is generated for changing the valve timing to the low speed valve timing in both of the lower and higher engine speed regions, when the abnormality is detected. When the abnormality is detected, the air- fuel ratio of an air-fuel mixture to be supplied to the engine is enriched when the engine is in a predetermined operating condition determined by the detected value of at least one engine parameter. The enriching of the air-fuel ratio of the air-fuel mixture is carried out by multiplying a basic fuel injection period by a correction coefficient or selecting a suitable basic fuel injection period map.

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