Air/fuel ratio control system for internal combustion engines, h

Details Air/fuel ratio control system for internal combustion engines, h Air/fuel ratio control system for internal combustion engines, h

1981-07-27

1983-07-19

Lall, Parshotam S.

Internal-combustion engines

Charge forming device

Having fluidic logic control means

123489, 123479, 123486, 123465, F02B 3300

Patent

active

043938426

ABSTRACT:
An air/fuel ratio control system for use with an internal combustion engine. The system is provided with an electrical circuit which operatively connects an O.sub.2 sensor with fuel quantity adjusting means in a manner effecting feedback control of the air/fuel ratio of a mixture produced by the fuel adjusting means and being supplied to the engine in response to the output signal of the O.sub.2 sensor. The electrical circuit includes means operable during open loop control of the air/fuel ratio under a particular engine operating condition, for controlling the fuel quantity adjusting means so as to obtain a mixture having a predetermined air/fuel ratio appropriate for the particular engine operating condition, irrespective of the O.sub.2 sensor output signal, and means for correcting the above predetermined ratio in response to atmospheric pressure. The electrical circuit further comprises fail safe means for detecting a malfunction in the atmospheric pressure sensor. The fail safe means is operable upon detection of such a malfunction to perform suitable fail safe functions including prevention of the mixture air/fuel ratio from being controlled to an inappropriate value even during the occurrence of the malfunction.

REFERENCES:
patent: 4060064 (1977-11-01), Minami et al.
patent: 4170201 (1979-10-01), Camp et al.
patent: 4172432 (1979-10-01), Wessel et al.
patent: 4187814 (1980-02-01), Phelan et al.
patent: 4245603 (1981-01-01), Pomerantz
patent: 4269156 (1981-05-01), Drellishak
patent: 4289103 (1981-09-01), Shinoda
patent: 4294216 (1981-10-01), Abo et al.

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