The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 21, 2001
Filed:
Jul. 12, 1999
Hae Kyung Sim, Seoul, KR;
Cheol Lim, Seoul, KR;
Auto Electronic Corporation, Seoul, KR;
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.