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:
Sep. 04, 2007
Filed:
May. 28, 2001
Yuji Kimoto, Aichi, JP;
Toshiya Matsuoka, Aichi, JP;
Yuji Kimoto, Aichi, JP;
Toshiya Matsuoka, Aichi, JP;
NGK Spark Plug Co., Ltd., Aichi, JP;
Abstract
It is an object of the invention to provide a gas detecting device capable of relieving the influence of an environment such as a temperature, a humidity or a wind velocity to detect a change in a concentration of a specific gas and an autoventilation system for a vehicle using the gas detecting device. More specifically, a gas detecting device () using a gas sensor element () changing a sensor resistance Rs depending on a concentration of a gas such as NOx and an autoventilation system () for a vehicle according to the invention A/D convert the output of a sensor resistance value converting circuit () to acquire a sensor output value S(n), calculates a base value B(n) based on B(n)=B(n−1)+k{S(n)−B(n−1)}, and furthermore, calculates a difference value of D(n)=S(n)−B(n). When the concentration of the gas is increased so that the difference value becomes greater than a predetermined concentration threshold, a high concentration signal is generated to close a flap () and a base value B(n) is calculated by using a coefficient kwhich is smaller than kbased on B(n)=B(n−1)+k{S(n)−B(n−1)}.