Device for determining activation of an air-fuel ratio sensor

Details Device for determining activation of an air-fuel ratio sensor Device for determining activation of an air-fuel ratio sensor

1992-02-27

1992-12-22

Wolfe, Willis R.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

123697, F02D 4114

Patent

active

051726777

ABSTRACT:
A device for determining activation of an air-fuel ratio sensor comprising an air-fuel ratio sensor arranged in an exhaust system of an engine and having a heater for heating an oxygen concentration cell element and an oxygen pump element, a current flowing means for flowing a predetermined current from a first electrode of the concentration cell to a reference electrode, a pump current controlling means for controlling current flowing in the pump element so that a sensor voltage between the reference electrode and the first electrode becomes a reference voltage, a pump current detecting means, a current flow cutting means, a sensor voltage detecting means, a heater power supplying means, and a timer means operated at every predetermined time interval for starting the heater supplying power means to the heater during a pump-current-cut state and for operating the current flow cutting means during the predetermined time interval. The air-fuel ratio controlling device determines the activation of the sensor by the difference between the sensor voltage before and after the current flow cutting means is operated and releases the pump-current-cut state when the sensor is determined to be activated.

REFERENCES:
patent: 4505246 (1985-03-01), Nakajima et al.
patent: 4860712 (1989-08-01), Nakajima et al.
patent: 4889098 (1989-12-01), Suzuki et al.
patent: 4895123 (1990-01-01), Uchinami et al.
patent: 5036820 (1991-08-01), Fujimoto et al.
patent: 5054452 (1991-10-01), Denz

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