System for controlling an oxygen concentration in exhaust gases

Details System for controlling an oxygen concentration in exhaust gases System for controlling an oxygen concentration in exhaust gases

1978-11-30

1981-05-12

Myhre, Charles J.

Internal-combustion engines

Charge forming device

Having fluidic logic control means

123489, 73 23, F02D 3500

Patent

active

042665191

ABSTRACT:
A system for controlling an oxygen concentration in exhaust gases emitted from a combustion engine. An oxygen sensor which changes a resistance in response to a sensed presence and absence of oxygen in exhaust gases is connected in series with an electric power source and a transistor to produce an output voltage indicative of the sensed presence and absence of oxygen. A comparator compares magnitudes of the sensor output voltage with a predetermined magnitude. In response to an output voltage of the comparator, the transistor controls a biasing current flowing from the electric power source to the sensor so that, when either presence or absence of oxygen is sensed, the sensor output voltage is kept substantially at the predetermined magnitude irrespective of temperature dependent changes in the resistance of the oxygen sensor.

REFERENCES:
patent: 3915135 (1975-10-01), Kushida et al.
patent: 4140085 (1979-02-01), Rabus et al.
patent: 4153023 (1979-05-01), Asano et al.
patent: 4156404 (1979-05-01), Anzai
patent: 4156413 (1979-05-01), Taplin

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