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:
Jan. 03, 1995
Filed:
May. 17, 1993
Hamid B Servati, Farmington Hills, MI (US);
Steven T Darr, Ypsilanti, MI (US);
Mary B Furness, St. Clair Shores, MI (US);
Ford Motor Company, Dearborn, MI (US);
Abstract
An apparatus for controlling temperatures of catalytic converters in an exhaust system of an internal combustion engine. The exhaust system includes a light-off catalytic converter and a main, or underbody, catalytic converter. The light-off catalytic converter is smaller and is disposed nearer to the engine than is the main catalytic converter so that it can be brought to an efficient operating temperature by engine exhaust gases in less time than can the main catalytic converter. This reduces the output of initial undesirable exhaust emissions during start-up periods when the engine and exhaust system components are relatively cold. A valve controls the flow of exhaust gases through each of the two catalytic converters to bring them most quickly to, and maintain them at, their most efficient operating temperatures.