Purge-compensated air-fuel ratio control apparatus

Details Purge-compensated air-fuel ratio control apparatus Purge-compensated air-fuel ratio control apparatus

1994-09-28

1996-07-16

Wolfe, Willis R.

Internal-combustion engines

Engine speed regulator

Idle speed control

12333918, 123698, 123520, F02D 4104, F02M 306, F02M 2508

Patent

active

055357199

ABSTRACT:
A canister is provided between a fuel tank and an intake conduit of an engine so that fuel vapor generated in the tank and adsorbed in the canister is purged into the intake conduit. In correcting a fuel quantity in accordance with a purge quantity, the fuel quantity is compensated for by a canister piping condition such as a pressure loss and/or a purge delay. A first fuel correction coefficient is calculated from canister pressure, intake pressure and atmospheric pressure. The first coefficient may be calculated in association with an idling speed control value. A second fuel correction coefficient is calculated from changes in purge flow quantity and canister pressure. The second coefficient may be calculated in association with an air-fuel ratio feedback control value.

REFERENCES:
patent: 5216995 (1993-06-01), Hosoda et al.
patent: 5228421 (1993-07-01), Orzel
patent: 5299544 (1994-04-01), Kitamoto et al.
patent: 5329909 (1994-07-01), Hosoda et al.
patent: 5363832 (1994-11-01), Suzumura et al.

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