Feedback air fuel ratio control system and method

Details Feedback air fuel ratio control system and method Feedback air fuel ratio control system and method

1982-01-18

1984-11-20

Lall, Parshotam S.

Internal-combustion engines

Charge forming device

Fuel injection system

123440, F02M 5100

Patent

active

044833008

ABSTRACT:
A feedback air fuel ratio control system or method for a multi-cylinder engine is arranged not only to control the average value of the air fuel ratios among the cylinders but also to control the individual air fuel ratio of the individual cylinders so as to level the cylinder to cylinder air fuel distribution. This is done, for example, by directly detecting which cylinder is a source of the air fuel deviation by examining the oxygen sensor signal fluctuation in relation of time and individually regulating a fuel injector for that cylinder. In the case of an engine with a carburetor, the carburetor is controlled in relation with time in accordance with the sequence of the intake periods of the individual cylinders to control the individual air fuel ratio.

REFERENCES:
patent: 4111171 (1978-09-01), Aono et al.
patent: 4116169 (1978-09-01), Krupp et al.
patent: 4301780 (1981-11-01), Hoshi
patent: 4337745 (1982-07-01), Pomerantz

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