Oxygen sensor temperature monitor for an engine exhaust monitori

Details Oxygen sensor temperature monitor for an engine exhaust monitori Oxygen sensor temperature monitor for an engine exhaust monitori

1977-07-11

1979-01-23

Goldstein, Herbert

Measuring and testing

Gas analysis

Gas chromatography

731173, 60276, G01N 3122

Patent

active

041353811

ABSTRACT:
A vehicle engine includes an exhaust monitoring system with an exhaust mounted oxygen sensor and apparatus for processing the sensor output voltage into an exhaust constituent signal which may, for example, be used to control the air-fuel ratio of the engine fuel supply to a substantially stoichiometric ratio, the apparatus including a low pass filter which suppresses components of the signal greater in frequency than a predetermined cutoff frequency. An alternating voltage generator effective to generate a square wave of at least the cutoff frequency is connected through a reference impedance, a capacitor and the oxygen sensor in series to ground, thus creating a voltage divider with an output between the reference impedance and the sensor internal impedance, the voltage at the output having a peak-to-peak amplitude which varies inversely with sensor temperature. The voltage at the output is provided to a peak detector, which generates therefrom a signal representing the temperature of the oxygen sensor. The low pass filter in the closed loop fuel control and the capacitor protect the exhaust constituent signal from distortion by the alternating voltage.

REFERENCES:
patent: 3915135 (1975-10-01), Kushida
patent: 3932807 (1976-01-01), Wilson
patent: 3990411 (1976-11-01), Toelle et al.

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