Air-fuel ratio detecting system of internal combustion engine

Internal-combustion engines – Charge forming device – Including exhaust gas condition responsive means

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Details

123696, 73 106, 701109, F02D 4114, G01N 27416

Patent

active

057788669

ABSTRACT:
In an internal combustion engine equipped with electronically controlled fuel injection valves, there is provided an air-fuel ratio detecting system. The system comprises a wide range type air-fuel ratio sensor disposed in an exhaust pipe of the engine. The sensor issues an output voltage that varies continuously in accordance with an exhaust gas air-fuel ratio possessed by an exhaust gas in the exhaust pipe. The output voltage of the sensor is translated to an air-fuel ratio of air-fuel mixture with reference to a reference table. A variation characteristic of the output voltage of the sensor is decided relative to variation of the air-fuel ratio of air-fuel mixture. A correction data of the translated air-fuel ratio is formed with reference to the variation characteristic. The translated air-fuel ration is corrected with reference to the correction data.

REFERENCES:
patent: 4502444 (1985-03-01), Rubbo et al.
patent: 5036819 (1991-08-01), Peter et al.
Patent Abstracts of Japan, vol. 18, No. 194, (P1722), Apr. 5, 1994, for JP 6-3304 (Tomizawa et al), Jan. 11, 1994.

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