Air-fuel ratio control system

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

1991-07-10

1993-05-11

Nelli, Raymond A.

Internal-combustion engines

Charge forming device

Fuel injection system

123672, F02M 5100

Patent

active

052092062

ABSTRACT:
An air-fuel ratio control system compares an air-fuel ratio indicated by air-fuel ratio information from an air-fuel ratio sensor and a target air-fuel ratio determined depending on operating conditions of a motor vehicle which incorporates the air-fuel ratio control system, for reliably determining at least a failure of the air-fuel ratio sensor. When a failure of the air-fuel ratio sensor is detected, an air-fuel ratio feedback control process is stopped or the air-fuel ratio sensor is disabled, preventing the air-fuel ratio from being corrected in error based on an output signal from the air-fuel ratio sensor which has failed. Therefore, the air-fuel ratio control system prevents problems such as poor exhaust gas purification, reduced drivability, and unstable engine idling from taking place.

REFERENCES:
patent: 4938194 (1990-07-01), Kato et al.
patent: 4951632 (1990-08-01), Yakuwa et al.
patent: 4980834 (1990-12-01), Ikada et al.
patent: 5020499 (1991-06-01), Kojima et al.

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