Engine air-fuel ratio controller

Details Engine air-fuel ratio controller Engine air-fuel ratio controller

1997-04-18

1998-06-16

Nelli, Raymond A.

Internal-combustion engines

Charge forming device

Fuel injection system

F02M 5100

Patent

active

057655332

ABSTRACT:
In engine feedback control, a target air-fuel ratio corresponding amount is computed according to engine running conditions. A steady state deposition amount is also computed according to the target air-fuel ratio corresponding amount and engine running conditions. A difference between the steady state deposition amount and the deposition amount at that time is calculated, and a deposition rate is computed based on a quantity proportion. A basic injection amount is corrected by the target air-fuel ratio corresponding amount, and this corrected value is again corrected by the deposition rate so as to calculate a final injection amount. As the steady state deposition amount varies according to the target air-fuel ratio corresponding amount according to this invention, overrichness or overleanness due to insufficiency of the transient correction amount when the target air-fuel ratio corresponding amount is changed, is prevented.

REFERENCES:
patent: 5584277 (1996-12-01), Chen et al.
patent: 5609139 (1997-03-01), Ueda et al.
patent: 5629853 (1997-05-01), Ogawa et al.
patent: 5647324 (1997-07-01), Nakajima

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