Air-fuel ratio controller of internal-combustion engine

Details Air-fuel ratio controller of internal-combustion engine Air-fuel ratio controller of internal-combustion engine

1993-11-05

1994-11-15

Wolfe, Jr., Willis R.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

123698, F02M 2508, F02D 4114

Patent

active

053638301

ABSTRACT:
An air-fuel ratio controller of an internal combustion engine for preventing that an air-fuel ratio in the beginning of the purging operation of evaporated fuel is excessive. Evaporated fuel produced within a fuel tank is absorbed in a canister and the evaporated fuel absorbed in the canister is purged to the air intake side of the internal combustion engine through a purge valve together with air. A concentration of the evaporated fuel is detected by an air-fuel ratio feedback value detected by an oxygen sensor and a fuel injection quantity is corrected to be reduced in accordance with the detected evaporated fuel concentration and the purge ratio. When the air-fuel ratio feedback value exceeds a predetermined value or an output of the oxygen sensor is rich during the purging operation, it is judged that detection of concentration is insufficient and the update value for detection of concentration is made larger than a usual value. At the same time, gradual change of purging in the beginning of the purging is stopped to maintain or reduce the purge ratio.

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