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:
Apr. 23, 2002
Filed:
Jan. 17, 2001
Junichi Taga, Fuchu-cho, JP;
Kazuya Yokota, Fuchu-cho, JP;
Youichi Kuji, Fuchu-cho, JP;
Masayuki Kuroki, Fuchu-cho, JP;
Mazda Motor Corporation, Hiroshima-ken, JP;
Abstract
An exhaust-gas cleaning device comprises an absorption quantity detector ( ) for determining the first and second amounts of NO and oxygen absorbed by a NO -absorbing material and an oxygen-absorbing material during first and second reference times based on sensing signals fed from an oxygen concentration detector ( ), a NO quantity estimator ( ) for obtaining first and second estimated values of the amount of NO absorbed by the NO -absorbing material during the first and second reference times in accordance with engine operating condition, and a deterioration detector ( ) for making a judgment on deterioration of the NO -absorbing material based on the first and second amounts of absorption of NO and oxygen determined by the absorption quantity detector ( ) and the first and second estimated values of the amount of NO obtained by the NO quantity estimator ( ).