Engine air-fuel ratio controller

Details Engine air-fuel ratio controller Engine air-fuel ratio controller

1993-09-30

1994-09-13

Wolfe, Willis R.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

F02D 4114

Patent

active

053459210

ABSTRACT:
A fuel supply amount is feedback controlled by a controller according to a feedback correction amount computed based on the output of an oxygen sensor installed in an exhaust pipe. An air-fuel ratio detected by this sensor is used to update a basic injection feedback correction amount which is a step fraction when there is a change-over of the air-fuel ratio, and an integral fraction when there is no change-over of the air-fuel ratio. This controller is further provided with a mechanism for detecting engine start-up, a mechanism for setting an initial value of a warm-up correction amount according to the engine temperature during start-up, a mechanism for computing a warm-up correction amount reduced according to the time elapsed after start-up, and a mechanism for adding this warm-up correction amount to said step fraction. The amplitude of the air-fuel ratio variation during engine warm-up is therefore maintained at or above a certain level, and the exhaust conversion efficiency of the three-way catalyst during the warm-up is improved.

REFERENCES:
patent: 4221194 (1980-09-01), Wright
patent: 4475517 (1984-10-01), Kobayashi et al.
patent: 4492204 (1985-01-01), Bertsch et al.
patent: 4586478 (1986-05-01), Nogami et al.
patent: 4777924 (1988-10-01), Fujimura et al.
patent: 5279275 (1994-01-01), Freudenberg

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