Air/fuel ratio control apparatus

Details Air/fuel ratio control apparatus Air/fuel ratio control apparatus

1996-07-30

1997-12-09

Argenbright, Tony M.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

123698, F02D 4114, F02M 2508

Patent

active

056949111

ABSTRACT:
Fuel vapor is produced in a fuel tank and absorbed in a canister. The absorbed fuel vapor is purged through a purge passage into an engine induction passage under predetermined engine operating conditions. The air/fuel ratio is learned for air/fuel ratio feedback control. The learning control is inhibited when the fuel temperature exceeds a reference value during the air/fuel ratio feedback control. In another aspect of the invention, a purge valve is provided in the purge passage. The air/fuel ratio correction factor is set at an initial value in response to a movement of a purge valve from its open position toward its closed position.

REFERENCES:
patent: 5044341 (1991-09-01), Henning et al.
patent: 5406927 (1995-04-01), Kato et al.
patent: 5469833 (1995-11-01), Hara et al.
patent: 5544638 (1996-08-01), Yuda

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