Importance

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Abstract

There are provided with a gas detecting sensor and a gas detecting device for controlling a ventilation system of a vehicle using the gas detecting sensor. The gas detecting sensor of the present invention includes two kinds of gas sensing layers separately formed and a heater assembly for heating the two sensing layers to different temperatures. The gas detecting device includes: a sensor signal detecting unit for detecting a gas based upon a parallel resistance value obtained by connecting the two kinds of sensing layers of the gas detecting sensor to each other in parallel; a heater drive unit for periodically adjusting the heater to a gasoline exhaust gas sensing temperature and to a diesel exhaust gas sensing temperature; a pulse width modulation (PWM) signal converting unit for generating a differential waveform signal corresponding to the variation of a parallel resistance from the sensor signal detecting unit and converting the differential waveform signal into a PWM signal; and a control unit for controlling the heater drive unit and the PWM signal converting unit, receiving and estimating a sensor signal in the form of a digital signal of the PWM signal, determining a pollution level based upon the estimation, and controlling a ventilation system.

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First Claim