Air-fuel ratio sensor

Details Air-fuel ratio sensor Air-fuel ratio sensor

1993-06-09

1994-08-23

Niebling, John

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204426, 123688, 123697, 123703, G01N 2726, F02D 4114

Patent

active

053404629

ABSTRACT:
An air-fuel ratio sensor comprises an oxygen concentration cell device, an oxygen pump device, a heater for heating the oxygen concentration cell device and the oxygen pump device, a pump current cut means for stopping the supply of the pump current, first and second timers for controlling the condition of stopping the pump current, and a controller for starting the heating of the heater under the condition of stopping the pump current, to the pump device and for removing the stopping of the pump current for a predetermined time at predetermined intervals from the starting of supplying power to the heater, by means of the first timer, wherein when the pump current shows a predetermined value or higher, the pump current is stopped and the second timer is started, and when the operation of the second timer is finished, the judgment of the activation of the sensor is made, and at the same time, the stopping of the pump current is removed.

REFERENCES:
patent: 4886028 (1989-12-01), Uchinami et al.
patent: 4895123 (1990-01-01), Uchinami et al.
patent: 5172677 (1992-12-01), Suzuki
patent: 5172678 (1992-12-01), Suzuki

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