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. 28, 2006
Filed:
Jun. 17, 2004
Yasuki Tamura, Nisshin, JP;
Yasuki Tamura, Nisshin, JP;
Mitsubishi Jidosha Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
An exhaust emission control device for internal combustion engine comprising air-fuel ratio modulating means and air-fuel ratio modulation adjusting means. The air-fuel ratio modulation adjusting means adjusts a lean period to be longer or the degree of leaning to be higher, during which the air-fuel ratio of exhaust gas is a lean air-fuel ratio, compared with when an oxygen storage (S) of a three-way catalyst exceeds a first given value Xif the oxygen storage is not higher than the first given value X(S, S), and adjusts a rich period to be longer or the degree of enriching to be higher, during which the exhaust air-fuel ratio is a rich air-fuel ratio, compared with when a reducing agent storage (S) exceeds a second given value Yif the reducing agent storage is not higher than the second given value Y(S, S).