Method and apparatus for controlling the air-fuel ratio in an in

Details Method and apparatus for controlling the air-fuel ratio in an in Method and apparatus for controlling the air-fuel ratio in an in

1984-07-03

1986-01-07

Nelli, Raymond A.

Internal-combustion engines

Charge forming device

Fuel injection system

123415, 36443108, F02B 302, F02D 502

Patent

active

045628181

ABSTRACT:
In an internal combustion engine, a standard deviation of combustion variations generated for every firing stroke of at least one cylinder is calculated. The misfire limit of the engine is detected by determining whether or not the calculated standard deviation is greater than a reference value. When the calculated standard deviation is greater than the reference value, the controlled air-fuel ratio is decreased, while when the calculated standard deviation is not greater than the reference value, the controlled air-fuel ratio is increased, thereby attaining a lean burn system without a lean mixture sensor.

REFERENCES:
patent: 4345561 (1982-08-01), Kondo et al.
patent: 4347571 (1982-08-01), Leung et al.
patent: 4359991 (1982-11-01), Stumpp et al.
patent: 4380800 (1983-04-01), Wilkenson
patent: 4383514 (1983-05-01), Fiala
patent: 4418673 (1983-12-01), Tominari et al.
patent: 4465051 (1984-08-01), Hasegawa
patent: 4480620 (1984-11-01), Tange et al.

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