Device for controlling the electrical power supply of an oxygen

Details Device for controlling the electrical power supply of an oxygen Device for controlling the electrical power supply of an oxygen

1990-11-14

1994-05-17

Tung, T.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

20415318, 204406, G01N 27419

Patent

active

053125380

ABSTRACT:
A device for controlling electrical power to an oxygen pump portion of a linear oxygen sensor comprises a bridge of transistors controlled by a microprocessor. The microprocessor processes a measurement signal delivered by a measurement cell of the probe in order to control the direction and duration of the passage through an oxygen pump of a current of predetermined strength, the current being controlled based on the measurement signal. The current is periodically alternated, and provided with a variable cyclic ratio, by appropriate switching of the transistors in the bridge. The device is used for the measurement of the air/fuel ratio in the mixture supplied to an internal combustion engine.

REFERENCES:
patent: 3992622 (1976-11-01), Numata et al.
patent: 4759328 (1988-07-01), Blumel et al.
Hetrick et al., "Oscillatory-Mode Oxygen Sensor", 8093 IEEE Transactions on Electron Devices, vol. ED-29 (1982), Jan., No. 1, New York, USA, pp. 129-132.

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