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. 28, 2005
Filed:
Oct. 16, 2000
Shinichi Matsunaga, Aichi, JP;
Shuichi Kubo, Aichi, JP;
Motohisa Saiki, Aichi, JP;
Kabushiki Kaisha Toyota Chuo Kenkyusho, Aichi-gun, JP;
Abstract
An NOstorage-and-reduction type catalyst is used which exhibits a saturated NOstorage amount of 5 g or more as NOwith respect to 1 liter of a catalyst volume at 500° C., and rich spiking is controlled so that an actual NOstorage amount of the NOstorage-and-reduction type catalyst becomes 50% or less of the saturated NOstorage amount. Since the saturated NOstorage amount is large, the NOstorage amount is large even when it is 50% or less, it is possible to prolong intervals of the rich spiking. Then, since NOstorage component stores NOpreferentially into the sites which are likely to store and release NO, a reduction efficiency is high. Therefore, while prolonging the intervals of the rich spiking and sustaining an effect of mileage improvement, it is possible to improve the reduction efficiency of NO.