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US 7,441,519 B2Granted
Engine valve actuation system
AssigneeCaterpillar Inc.
InventorsHoma Afjeh, Ronald D. Shinogle, Gregory D. Brock, Scott A. Leman
Life of this patent
Estimating the term…
Abstract
An engine valve actuation system may include an intake valve moveable between a first position that blocks a flow of fluid and a second position that allows a flow of fluid. The system may also include a cam assembly configured to move the intake valve between the first position and the second position. An electromagnetic actuator may be configured to selectively modify a timing of the intake valve in moving from the second position to the first position.
Claims13
An engine valve actuation system, comprising:
- an intake valve moveable between a first position that blocks a flow of fluid and a second position that allows a flow of fluid;
- a cam assembly configured to move the intake valve between the first position and the second position, the cam assembly comprising a cam and a rocker arm;
- an electromagnetic actuator including a solenoid coil and an armature coupled with a core, the electromagnetic actuator configured to selectively modify a timing of the intake valve in moving from the second position to the first position by the core directly engaging and disengaging the rocker arm;
- and
- a controller configured to selectively engage the electromagnetic actuator to modify the timing of the intake valve.
2 more elements
An engine, comprising:
- a block defining at least one cylinder and a cylinder head having at least one intake passageway leading to the at least one cylinder;
- at least one intake valve moveable between a first position to prevent a flow of fluid through the at least one intake passageway and a second position to allow a flow of fluid through the at least one intake passageway;
- a cam assembly connected to the intake valve to move the intake valve between the first position and the second position, the cam assembly comprising a cam and a rocker arm;
- an electromagnetic actuator including a solenoid coil and an armature coupled with a core, the electromagnetic actuator configured to selectively modify a timing of the intake valve in moving from the second position to the first position by the core directly engaging and disengaging the rocker arm.
1 more element
Dependencies are inferred from the claim text.