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:
Feb. 22, 2005
Filed:
Nov. 27, 2002
Yuji Kimoto, Aichi, JP;
Toshiya Matsuoka, Gifu, JP;
Yuji Kimoto, Aichi, JP;
Toshiya Matsuoka, Gifu, JP;
NGK Spark Plug Co., Ltd., Nagoya, JP;
Abstract
A gas detection apparatus incorporating a gas sensor element and a vehicle automatic ventilation system including the apparatus in which a sensor output value S(n) is obtained, and a base value B(n) is calculated by use of Expression (1): B(n)=B(n−1)+k1[S(n)−B(n−1)]−k2[S(n)−S(n−5)] in the case where S(n)≧B(n−1), or by use of Expression (3): B(n)=S(n) in the case where S(n)<B(n−1), followed by calculation of a difference value D(n); i.e., S(n)−B(n). When the difference value exceeds a predetermined high connection threshold, a high-concentration signal is generated to close a flap. After that, the base value B(n) is calculated by use of Expression (4): B(n)=B(n−1)+k3[S(n)−B(n−1)]−k4[S(n)−S(n−5)]. When the difference value becomes smaller than a predetermined low-concentration threshold, a low-concentration signal is generated to open the flap.