Diagnostic system of an air-fuel ratio control device

Details Diagnostic system of an air-fuel ratio control device Diagnostic system of an air-fuel ratio control device

1988-04-12

1989-04-11

Nelli, Raymond A.

Internal-combustion engines

Charge forming device

Auxiliary control of carburetor fuel metering

123440, 123489, F02M 700, F02M 5100, F02D 4122, F02D 4114

Patent

active

048196010

ABSTRACT:
A diagnostic system of an air-fuel ratio control device including an O.sub.2 sensor and an air bleed control valve actuated in response to a signal output by the O.sub.2 sensor. When the electric control current fed into the air bleed control valve reaches an upper limit or lower limit and remains at the upper limit or lower limit for a fixed time, the diagnostic system determines that the air-fuel ratio control device has malfunctioned. When the temperature of the engine cooling water is high, a diagnosis is prohibited, to prevent an incorrect diagnosis.

REFERENCES:
patent: 4651699 (1987-03-01), Ohtaki et al.
patent: 4655181 (1987-04-01), Ohtaki et al.
patent: 4655182 (1987-04-01), Nakano et al.
patent: 4671243 (1987-06-01), Deutsch
patent: 4677955 (1987-07-01), Takao
patent: 4694809 (1987-09-01), Nakano et al.
patent: 4753203 (1988-06-01), Yamada
patent: 4759332 (1988-07-01), Morozumi
patent: 4766868 (1988-08-01), Shibata

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