Air-fuel ratio system for an internal combustion engine

Details Air-fuel ratio system for an internal combustion engine Air-fuel ratio system for an internal combustion engine

1995-02-17

1996-06-25

Wolfe, Willis R.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

123698, F02D 4114, F02M 2508

Patent

active

055290477

ABSTRACT:
An air/fuel control system for an internal combustion engine or the like delivers evaporated gas from the engine's fuel tank and adsorbed in a canister to an intake of the engine via a discharge route. A purge vacuum switching valve (VSV 16) disposed in the discharge route controls the rate at which the evaporated gas is delivered to the engine intake. Using a sensor, the air/fuel ratio of the engine intake is determined and the deviation of the detected air/fuel ratio from a target ratio calculated according to learned air/fuel ratio parameters is calculated. The density of the evaporated fuel stream is determined based on that deviation, and the VSV is driven based on the calculated evaporated gas density. If the air/fuel parameters are not learned within a predetermined time, the VSV is driven at a fixed rate. A drive signal to the engine's fuel injection system also may be corrected based on the calculated evaporated fuel density.

REFERENCES:
patent: 4683861 (1987-08-01), Breitkreuz et al.
patent: 4865000 (1989-09-01), Yajima
patent: 5048493 (1991-09-01), Orzel et al.
patent: 5090388 (1992-02-01), Hamburg et al.
patent: 5203870 (1993-04-01), Kayanuma et al.
patent: 5216991 (1993-06-01), Iida et al.
patent: 5245978 (1993-09-01), Orzel
patent: 5363830 (1994-11-01), Morikawa

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