Control system and method for engine valve actuator

Details Control system and method for engine valve actuator Control system and method for engine valve actuator

2007-02-20

2007-02-20

Denion, Thomas (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

Hydraulic system

C123S090150, C123S090160, C123S090120, C123S320000

Reexamination Certificate

active

10454616

ABSTRACT:
A system and method for controlling a variable valve actuation system for an engine is provided. An engine valve is moved between a first position where the engine valve blocks a flow of fluid and a second position where the engine valve allows a flow of fluid. Fluid is provided to a chamber of a valve actuator adapted to operatively engage the engine valve. A parameter indicative of a viscosity of the fluid provided to the chamber of the valve actuator is sensed. Fluid is trapped within the chamber of the valve actuator to prevent the engine valve from moving to the first position. A response time of the valve actuator is determined based on the viscosity of the fluid provided to the chamber of the valve actuator. The response time indicates the time required to release the fluid from the chamber of the valve actuator to allow the engine valve to move to the first position.

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