Air-fuel ratio detecting device and method

Details Air-fuel ratio detecting device and method Air-fuel ratio detecting device and method

1996-01-25

1999-07-20

Louis-Jacques, Jacques H.

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

With indicator or control of power plant

701101, 701102, 123686, 123491, 123693, 73 2332, 731173, G06G 770, F02D 4100, G01N 700

Patent

active

059250887

ABSTRACT:
An air-fuel ratio detecting device and a method capable of correctly and very precisely detecting the air-fuel ratio of an internal combustion engine. The air-fuel ratio detecting device comprises an air-fuel ratio sensor disposed in the exhaust system of an internal combustion engine, an air-fuel ratio sensor circuit which applies a voltage to the air-fuel ratio sensor, detects the current through the air-fuel ratio sensor and produces an output that varies in proportion to the magnitude of the current that is detected, and a storage means for storing the data of a conversion map which is used for calculating the air-fuel ratio of the internal combustion engine in response to the output of the air-fuel ratio sensor circuit. The air-fuel ratio detecting device further comprises a circuit error detection means for detecting an error in the output caused by the air-fuel ratio sensor circuit, and a map calibration means for calibrating the data of the conversion map stored in the storage means based upon the error in the output detected by the circuit error detection means.

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