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. 25, 2002
Filed:
Feb. 01, 2001
Yutaka Ide, Saitama-ken, JP;
Honda Giken Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
A controller for a cylinder cut-off type internal combustion engine is provided for ensuring an activated state of catalysts in cylinders, which are stopped during a partial cylinder operation, at all times to maintain favorable emission characteristics upon switching from the partial cylinder operation to a full cylinder operation, and for maintaining a satisfactory fuel consumption rate by conducting the partial cylinder operation to the utmost. The cylinder cut-off type internal combustion engine can be switched between the partial cylinder operation and the full cylinder operation. Exhaust gas from cylinders in a right bank, which are switched off during the partial cylinder operation, and from cylinders in a left bank is purified by two catalyst units in exhaust pipes independent of each other. The controller estimates an estimated catalyst temperature of the catalyst for the right bank, and disables the partial cylinder operation when the estimated catalyst temperature is below a predetermined temperature.