Temperature control apparatus for humidity sensor

Details Temperature control apparatus for humidity sensor Temperature control apparatus for humidity sensor

2006-06-20

2006-06-20

Cygan, Michael (Department: 2855)

Measuring and testing

Gas analysis

Moisture content or vapor pressure

C073S335030, C073S029010, C073S025040

Reexamination Certificate

active

07062968

ABSTRACT:
A temperature control apparatus for a humidity sensor is provided for preventing impurities from sticking on a sensor element, while protecting the sensor element from cracking due to the humidity sensor heated by a heater in the presence of condensation, to maintain a high detection accuracy of the humidity sensor. The temperature control apparatus is configured to control the temperature of a sensor element of a humidity sensor disposed in an exhaust passage of an internal combustion engine for detecting the humidity within the exhaust passage. The temperature control apparatus comprises a heater for heating the sensor element, a temperature sensor for detecting the temperature of the sensor element, and an ECU for controlling a heating amount of the heater to bring the detected temperature of the sensor element to a first predetermined temperature during an operation of the internal combustion engine.

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