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. 02, 2003
Filed:
Dec. 30, 2002
Mark S. Cavanagh, Bloomington, IL (US);
Caterpillar Inc, Peoria, IL (US);
Abstract
A method of controlling a valve actuation system is provided. An intake cam assembly is operated to move an intake valve between a first position and a second position. An exhaust cam assembly is operated to move an exhaust valve between a first position a second position. An engine brake is operated to selectively move the exhaust valve from the first position towards the second position when a piston is at or near a top-dead-center position of a compression stroke. At least one operating parameter of the engine is sensed. A desired intake valve actuation period is determined based on the at least one operating parameter. A valve actuator is engaged with the intake valve to prevent the intake valve from returning to the first position in response to operation of the intake cam assembly. The valve actuator is released to allow the intake valve to return to the first position at the end of the determined valve actuation period.