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:
Dec. 26, 2000
Filed:
Nov. 12, 1999
John Denari, Dearborn, MI (US);
Jeffrey Scott Hepburn, Birmingham, MI (US);
Ford Global Technologies, Inc., Dearborn, MI (US);
Abstract
A method (100) and system (10) for controlling the temperature of a first NO.sub.x trap in an aftertreatment system for a variable displacement engine (12). The frequency of switching between first and second cylinder banks (14, 16) of said variable displacement engine (12) controls the temperature of the NO.sub.x trap (18) in order to maintain the temperature within a preferred operating temperature range. A set of control valves (V1, V2, V3) is used to direct the flow of exhaust from alternate cylinder banks (14, 16) through various paths in order to maintain the desired temperature of the first NO.sub.x trap (18). In another embodiment (30), the aftertreatment and method (120) include a second NO.sub.x trap (26) for situations in which both engine banks (14, 16) are run simultaneously.