Air-fuel ratio control for an international combustion engine

Details Air-fuel ratio control for an international combustion engine Air-fuel ratio control for an international combustion engine

1985-08-26

1987-01-06

Wolfe, Jr., Willis R.

Internal-combustion engines

Charge forming device

Fuel injection system

123493, 123478, F02D 4104, F02D 4126

Patent

active

046338411

ABSTRACT:
An engine air-fuel ratio control system in which the engine operating range is divided into a light load, medium load and heavy load regions. In the light load region, a control of the fuel supply is made so as to provide a mixture of leaner than the stoichiometric value. In the medium load region, a feedback control is made based on the signal from an O.sub.2 sensor and, in the heavy load region, a control is made to provide a richer mixture. In the transient between the light load and medium load regions, the air-fuel ratio is changed with a rate which changes in accordance with the rate of change in the engine load.

REFERENCES:
patent: 4487190 (1984-12-01), Isobe
patent: 4512318 (1985-04-01), Ito et al.
patent: 4520783 (1985-06-01), Matsushita et al.
patent: 4548181 (1985-10-01), Ishikawa et al.

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