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:
Jul. 13, 2004
Filed:
Oct. 17, 2001
Applicant:
Inventor:
Yoshihiro Majima, Inuyama, JP;
Assignee:
DENSO Corporation, Kariya, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F02D 1/302 ; F02D 4/106 ;
U.S. Cl.
CPC ...
F02D 1/302 ; F02D 4/106 ;
Abstract
Processing conditions are determined on the basis of an operation range. After IG-OFF, an intake valve opening timing is advanced to 20° CA BTDC, and an exhaust valve closing timing is retarded to 20° CA ATDC. By controlling the intake and exhaust valve timings as described above, it is possible to reduce the fuel sticking to the intake passage. Particularly in the case of cold engine starting before activation of the catalyst, it is possible to prevent direct exhaust of HC emissions and accordingly to reduce emissions because of the decreased amount of fuel sticking to the intake passage.