Method for quickly rendering a MOS gas sensor operational, MOS gas sensor system, and fuel cell system
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United States of America Patent
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Oct 22, 2002
Grant Date -
Nov 29, 2001
app pub date -
May 11, 2001
filing date -
May 17, 2000
priority date (Note) -
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Abstract
A method of speeding startup of a MOS gas sensor having a sensor element for sensing a target gas, and a heater configured to heat the sensor element, and which is responsive to a voltage applied thereto. The heater has an operating temperature which is selectively maintained by applying a first voltage thereto, and the heater further has a maximum recommended temperature which is selectively maintained by applying a second voltage thereto. The maximum recommended temperature is higher than the operating temperature, and the second voltage is higher than the first voltage. The method includes providing a third voltage to the heater which is greater than the second voltage for a predetermined amount of time which is selected to increase the temperature to a level not greater than the maximum recommended temperature in a shorter time period than if the second voltage is applied and maintained. A MOS gas sensor system and a fuel cell system also employ such a method.
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