Air-fuel modulation for oxygen sensor monitoring

Measuring and testing – Simulating operating condition – Marine

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G01M 1500

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053257111

ABSTRACT:
Method, for controlling fuel supply to an internal combustion engine utilizing a modulated air-fuel signal having a modified square-wave waveform, of monitoring operation of an oxygen sensor for sensing engine exhaust gas oxygen level. The method includes generating the modulated air-fuel signal having the modified square-wave waveform designed to produce a particular engine exhaust response for interrogating the oxygen sensor, and operating the engine based on the modulated air-fuel signal. The oxygen sensor produces an associated output signal in response to sensed exhaust gas oxygen levels. The method also includes processing the output signal of the oxygen sensor associated with the particular engine response so as to determine the operating condition of the oxygen sensor and to verify acceptable test conditions.

REFERENCES:
patent: 5020499 (1991-06-01), Kojima et al.
patent: 5212947 (1993-05-01), Fujimoto et al.

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