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:
Nov. 05, 2002
Filed:
Dec. 19, 2000
Brett D. Collins, Ypsilanti, MI (US);
Stephen DeLaSalle, Saline, MI (US);
Visteon Global Technologies, Inc., Dearborn, MI (US);
Abstract
A four-stroke internal combustion engine is disclosed wherein fuel and exhaust vapors are purged from the manifolds and each cylinder when the engine is shut down to minimize emissions on subsequent startup. The engine includes a cylinder, a reciprocating piston within the cylinder, and a cylinder head. An exhaust port with an exhaust valve communicates with the cylinder and an exhaust manifold with an emissions control device. An intake port with an intake valve communicates with the cylinder. Upon engine shutdown, a controller sends signals to a variable valve timing system for opening the exhaust valve when the piston is in upward motion, later closing the exhaust valve when the piston is in upward motion, opening the intake valve when the piston is in downward motion, later closing the intake valve when the piston is in downward motion, and opening the exhaust valve when the piston is in upward motion.