Air-fuel ratio control system for variable valve timing type...

Details Air-fuel ratio control system for variable valve timing type... Air-fuel ratio control system for variable valve timing type...

F - Mech Eng,Light,Heat,Weapons

02

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F02M 7/00 (2006.01) F01L 1/26 (2006.01) F02D 41/00 (2006.01)

Patent

CA 2072707

An air-fuel ratio control system for an internal combustion engine having at least one intake valve with its valve timing changeable at least between low- speed valve timing suitable for engine operation in a low engine rotational speed region, and high-speed valve timing suitable for engine operation in a high engine rotational speed region. When changeover is to be effected from the low-speed valve timing to the high-speed valve timing, an ECU changes the desired air-fuel ratio to be applied when the low-speed valve timing is selected, to one to be applied when the high- speed valve timing is selected, and changes the valve timing to the high-speed valve timing after the desired air-fuel ratio has been changed to the one to be applied when the high-speed valve timing is selected.

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