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:
Jun. 16, 1998
Filed:
Jul. 27, 1995
Masakazu Tanaka, Okazaki, JP;
Hiroshi Mori, Ichinomiya, JP;
Mamoru Mabuchi, Kariya, JP;
Hiroyuki Usami, Kariya, JP;
Kinji Hodaira, Okazaki, JP;
Nippondenso Co., Ltd., Aichi-pref, JP;
Abstract
An exhaust gas purifying apparatus with a failure diagnosis function is provided. A failure diagnosis device determines that the apparats is failed when the temperature rising speed of an adsorbing device is equal to a set value or less during a gas adsorption process and if the temperature rising speed is equal to an upper limit or more or to a lower limit or less during a gas desorption process. Further, a failure diagnosis device similarly monitors the flow passing through the adsorbing device. A failure diagnosis device determines that the apparatus is failed if the concentration of discharge gas is equal to a set value or more in a discharge passage. And further, a failure diagnosis device measures the concentration of discharge gas flowing through a return passage to accumulate the amount of discharge gas in order to determine that the apparatus is failed if the accumulated value is equal to a set value or less. Exhaust gas sensors are installed in the return passage and the upstream side of the adsorbing device, respectively, and the period of time te from the activation of the return passage until the outputs from the exhaust gas sensors match or a correlation coefficient for these outputs is measured to diagnose failures in the apparatus.