Canister purge control method and apparatus for internal combust

Details Canister purge control method and apparatus for internal combust Canister purge control method and apparatus for internal combust

1994-09-20

1995-11-28

Nelli, Raymond A.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

123518, 123519, 123520, F02M 3302

Patent

active

054698324

ABSTRACT:
According to one embodiment of the invention, a purge quantity is controlled in proportion to an air quantity sucked into an internal combustion engine. During normal operation of the engine, a purge air-fuel ratio is calculated according to a purge rate and an air-fuel feedback control quantity. During transient operation of the engine, a target air-fuel ratio feedback control quantity is calculated according to the purge rate and the purge air-fuel ratio. When the difference between the air-fuel ratio feedback control quantity and the target air-fuel ratio feedback control quantity is greater than a predetermined value, the air-fuel ratio feedback control quantity is corrected to the target air-fuel ratio feedback control quantity. An undue fluctuation in air-fuel ratio of a fuel mixture supplied to cylinders occurring upon rapid fluctuation in purge rate can be suppressed.

REFERENCES:
patent: 5127383 (1992-07-01), Wild
patent: 5172676 (1992-12-01), Imamura
patent: 5195495 (1993-03-01), Kitamoto et al.
patent: 5216991 (1993-06-01), Iida et al.
patent: 5228421 (1993-07-01), Orzel
patent: 5259353 (1993-11-01), Nakai et al.
patent: 5297528 (1994-03-01), Mukai
patent: 5347974 (1994-09-01), Togai et al.
patent: 5351193 (1994-09-01), Poirier et al.

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