Chemistry: electrical and wave energy – Apparatus – Electrolytic
Patent
1998-02-11
2000-07-04
Warden, Sr., Robert J.
Chemistry: electrical and wave energy
Apparatus
Electrolytic
219202, 219490, 219497, G01N 2726
Patent
active
060833696
ABSTRACT:
A heater control system for an air-fuel ratio sensor for an internal combustion engine is provided to supply power to a heater in order to activate the air-fuel ratio sensor quickly at the time of starting the engine. The system comprises an air-fuel ratio sensor arranged in the engine exhaust system for detecting the air-fuel ratio, a heater for heating the air-fuel ratio sensor, a power supply including a battery and an alternator for supplying power to the heater, a power switch for operating a power line for transmitting power from the power supply, a capacitor circuit charged by the power supply and adapted to discharge through the heater the electricity stored therein by the charging, a first switch connected in series with the heater for supplying or cutting off the current flowing to the heater, and a control unit for controlling the first switch to close after the power switch is closed. The system further comprises another capacitor circuit adapted to be connected in parallel to the power supply at the time of charging and to be connected in series with the power supply at the time of discharging to thereby apply to the heater a high voltage obtained by superimposing the charge voltage of the capacitor circuit on the source voltage. At and subsequent to the time of starting the engine, the power supplied to the heater is controlled in such a manner as to maintain the air-fuel ratio sensor in an active state.
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Olsen Kaj K.
Toyota Jidosha & Kabushiki Kaisha
Warden, Sr. Robert J.
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