Air-fuel ratio control system for internal combustion engine

Details Air-fuel ratio control system for internal combustion engine Air-fuel ratio control system for internal combustion engine

1997-02-21

1998-08-25

Argenbright, Tony M.

Internal-combustion engines

Charge forming device

Fuel injection system

123492, 123493, 123571, F02D 4104, F02M 2507

Patent

active

057973709

ABSTRACT:
An air-fuel ratio control system for an internal combustion engine having a fuel injection valve for each cylinder and an electronic air control valve (EACV) for controlling intake air bypassing the engine throttle valve. When the target air-fuel ratio is switched over from a rich value to a lean value, the amounts of fuel injected into the cylinders, for example, #1, #2, #3 and #4 cylinders are controlled so that they are sequentially decreased at predetermined intervals, and the EACV is controlled to be opened stepwise. This causes a decrease in engine torque generated by the switching-over of the target air-fuel ratio to be offset by an increase in engine torque generated by an increase in amount of air drawn, thereby preventing the generation of a torque shock. At this time, the target opening degree of the EACV is corrected based on the magnitude of the interval and the magnitude of a loading of the internal combustion engine, thereby further effectively preventing the generation of the torque shock.

REFERENCES:
patent: 5325828 (1994-07-01), Yamaguchi et al.
patent: 5413078 (1995-05-01), Mitsunaga et al.
patent: 5606960 (1997-03-01), Takahashi et al.
patent: 5642709 (1997-07-01), Ozaki et al.

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