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:
Oct. 05, 2004
Filed:
Sep. 20, 2002
Thomas J. Crowell, Peoria, IL (US);
David Andrew Pierpont, Dunlap, IL (US);
Caterpillar Inc, Peoria, IL (US);
Abstract
A system for operating an internal combustion engine includes an intake valve moveable between a first position at which fluid is blocked from flowing to or from the cylinder and a second position at which fluid is allowed to pass to or from the cylinder. The system includes a fluid actuator selectively operable to hold the intake valve from moving to the first position during a portion of a compression stroke and a control valve configured to control fluid flow between a source of fluid and the fluid actuator. A fuel supply system supplies a predetermined amount of fuel to the cylinder at an appropriate time during an engine cycle based on at least one engine operating parameter, and a controller determines a need to de-rate the engine based on a sensed parameter relating to source fluid viscosity during a cycle in which the fluid actuator is not operated.