Resistance component detecting apparatus for an oxygen concentration sensor and oxygen-concentration detecting apparatus
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United States of America Patent
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Oct 22, 2002
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N/A
app pub date -
Dec 11, 2000
filing date -
Jan 16, 1998
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Abstract
The resistance of an air-fuel-ratio sensor element is determined from current detected before changing an applied voltage to the sensor and current detected when a predetermined period elapses after changing the applied voltage to the sensor. A resistence detector includes operational amplifiers, resistors and transistors. The applied voltage is changed by switching the transistors to more accurately detect a resistance value.
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