Air-fuel ratio control system for engine

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

1993-08-06

1995-01-17

Nelli, Raymond A.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

123680, 123682, F02M 5100, F02M 700

Patent

active

053817761

ABSTRACT:
An air-fuel ratio control system for an engine, to which evaporated fuel in a canister is supplied, is used for feedback controlling an air-fuel ratio based on a feedback control value calculated according to the quantity of evaporated fuel supplied to the engine. A calculation is made, in a first range of engine operating conditions, of a difference of a first control value between the first control value determined during supplying of the evaporated fuel to the engine and the first control value determined during not supplying of the evaporated fuel to the engine in the first range. A second control value for a second range of engine operating conditions is established different from the first range based on a feedback control value for controlling an air-fuel ratio of fuel in the first range, a ratio of the quantity of intake air into the engine between the first and second ranges, and a ratio of the supplying quantity of the evaporated fuel into the engine between the first and second ranges. An air-fuel ratio is feedback controlled with the second control value in the second range.

REFERENCES:
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patent: 4660533 (1987-04-01), Watabe et al.
patent: 4759329 (1988-07-01), Nobuo et al.
patent: 4763264 (1988-08-01), Okuno et al.
patent: 4843558 (1989-06-01), Bergmann et al.
patent: 4886026 (1989-12-01), Cook
patent: 4892078 (1990-01-01), Fukutomi et al.
patent: 5220904 (1993-06-01), Miyashita et al.

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