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. 18, 2003
Filed:
Mar. 15, 2001
Makoto Ogiso, Susono, JP;
Shouji Katsumata, Gotemba, JP;
Kazuhiko Shiratani, Susono, JP;
Keiji Yoeda, Numazu, JP;
Hideyuki Nishida, Susono, JP;
Tomomi Yamada, Susono, JP;
Takamitsu Asanuma, Susono, JP;
Yoshihiro Iwashita, Suntou-gun, JP;
Kiyoshi Nakanishi, Susono, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
An apparatus is provided which includes an internal combustion engine of a lean-burn type, an NOx catalyst disposed in an exhaust passage of the engine so as to remove nitrogen oxides contained in exhaust gas emitted from the engine, and a variable valve control system capable of changing at least one of the opening and closing timing and a lift of the intake valve and/or the exhaust valve for each cylinder of the engine. The variable valve control system is controlled so that the exhaust gas to which the NOx catalyst is exposed is controlled so as to be suitable for removing a selected gaseous component from the NOx catalyst when the selected gaseous component should be removed. A method of purifying an exhaust gas emitted from the above engine is also provided.