Internal-combustion engines – Charge forming device – Including exhaust gas condition responsive means
Patent
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
051726785
ABSTRACT:
A device for determining activation of an air-fuel ratio sensor which comprises an air-fuel ratio sensor comprising an air-fuel ratio sensor comprising an oxygen concentration cell element and an oxygen pump element arranged in an exhaust system of an engine provided with electrodes and an interposing diffusion chamber wherein exhaust gas is diffused and introduced, and a heater for heating the oxygen concentration cell element and the oxygen pump element; a pump current controlling means for controlling pump current which flows in the pump element so that the electromotive force of the concentration cell element becomes a predetermined reference voltage; a pump current detecting means; a pump current cutting means; a pump voltage detecting means; a heater power supplying means; a memorizing means for memorizing a previous pump voltage allowable range for the pump current or a target air-fuel ratio of the engine; 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 releasing the cutting supply of the pump current during the predetermined time interval. The air-fuel ratio controlling device detects a pump voltage which determines that the air-fuel ratio sensor is activated when the pump voltage falls from the previously memorized pump voltage allowable range, and then releases the pump-current-cut state.
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Mitsubishi Denki & Kabushiki Kaisha
Wolfe Willis R.
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