Aged exhaust gas oxygen sensor simulator

Measuring and testing – Instrument proving or calibrating – Volume of flow – speed of flow – volume rate of flow – or mass...

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731181, 738664, F02M 6500, G01D 1800

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active

055222501

ABSTRACT:
An aged exhaust gas oxygen sensor (EGO) simulator is inserted between an exhaust gas oxygen sensor and an electronic control module for testing the response of fuel control and emission systems to various amounts of exhaust gas oxygen sensor aging/degrading. The sensor signal is input to a summing amplifier where a delay signal is added. Positive and negative summing amplifier outputs go through vernier and decade controls, which add delay, and then to a variable gain inverter. The difference signal is integrated and output to the summing amplifier as the delay signal and output to a ground offset control for shifting the waveform up and down before going out to the control module. The vernier and decade controls add delays to mimic an aged/degraded exhaust gas oxygen sensor.

REFERENCES:
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patent: 4562729 (1986-01-01), Maloney
patent: 5020499 (1991-06-01), Kojima et al.
patent: 5214915 (1993-06-01), Schneider et al.
patent: 5357791 (1994-10-01), Gee et al.
patent: 5396794 (1995-03-01), Nichols
patent: 5423203 (1995-06-01), Namiki et al.
Patent Abstracts of Japan Grp. p933, vol. 13, No. 422 Abs Pub Date Sep. 20, 1989 (01-155257) "Evaluating Method of Exhaust Gas Sensor for Engine".

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