Patent ID: 6799552
Filing Date: 2004-10-05
Classification: F02B,F02D,Y02T

Abstract:
A system for operating an internal combustion engine including at least one cylinder, comprising:an intake valve moveable between a first position at which fluid is blocked from flowing at least one of to and from the cylinder and a second position at which fluid is allowed to pass at least one of to and from the cylinder; a fluid actuator selectively operable to hold the intake valve from moving to the first position during a portion of a compression stroke of the engine; a source of fluid in fluid communication with the fluid actuator; a control valve configured to control a flow of fluid between the source of fluid and the fluid actuator; a fuel supply system configured to supply a predetermined amount of fuel to the cylinder at an appropriate time during an engine cycle based on at least one operating parameter of the engine; and a controller configured to determine a need to de-rate the engine during an engine cycle in which the fluid actuator is not operated, based on a sensed parameter relating to viscosity of fluid from the source.