Air-to-fuel ratio control system

Details Air-to-fuel ratio control system Air-to-fuel ratio control system

1988-06-30

1990-12-25

Lall, Parshotam S.

Boots, shoes, and leggings

731182, 123440, 123479, F02M 5100

Patent

active

049808346

ABSTRACT:
An air-to-fuel ratio control system executes a feedback control of air-to-fuel ratio based on an output of an oxygen sensor. The oxygen sensor is judged to be active when a change of the output therefrom occurs to make a fuel mixture rich. For detecting the failure or breakdown of the oxygen sensor when the feedback air-to-fuel control is suspended, the air-to-fuel ratio control system comprises an activity sensor for detecting whether the oxygen sensor is active or inactive, an air-to-fuel ratio altering device for enforcing an alteration of air-to-fuel ratio to make a fuel mixture rich, and a judging device for judging the oxygen sensor to be broken down when no activity detection is made while the alteration of air-to-fuel ratio has been effected.

REFERENCES:
patent: 3938075 (1976-02-01), Reddy
patent: 4019474 (1977-04-01), Nishimya et al.
patent: 4252098 (1981-02-01), Tomczak et al.
patent: 4671243 (1987-06-01), Deutsch
patent: 4677955 (1987-07-01), Takao
patent: 4729359 (1988-03-01), Tomisawa et al.
patent: 4777922 (1988-10-01), Mieno et al.
patent: 4825838 (1989-05-01), Osuga et al.

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