Air-fuel ratio control apparatus for multiple cylinder engine

Details Air-fuel ratio control apparatus for multiple cylinder engine Air-fuel ratio control apparatus for multiple cylinder engine

2006-01-24

2006-01-24

Kwon, John T. (Department: 3747)

Internal-combustion engines

Charge forming device

C123S673000, C701S109000

Reexamination Certificate

active

06988486

ABSTRACT:
An air-fuel ratio control apparatus for a multiple cylinder engine, having catalytic converters and air-fuel ratio sensors in an exhaust manifold, comprises exhaust air-fuel ratio variation determining means which determines a variation in exhaust air-fuel ratio between one cylinder and other cylinders in one cylinder group when an exhaust air-fuel ratio on one of the rich side and the lean side with respect to a predetermined value is detected as to the one cylinder twice in succession, an exhaust air-fuel ratio on the other one of the rich side and the lean side from the exhaust air-fuel ratio of the one cylinder, and combustion air-fuel ratio control means which feedback-compensates the quantity of fuel injected into the one cylinder, and feedback-compensated the quantity of fuel injected into the other cylinder in a direction opposite to the direction in which the quantity of fuel injected into the one cylinder is compensated.

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