Selective resetting lost motion engine valve train components
AssigneeJacobs Vehicle Systems, Inc.
InventorJustin D. Baltrucki
Life of this patent
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Abstract
Systems and related methods include a rocker arm having integrated components, including a lost motion actuator piston and components for resetting the lost motion actuator piston to provide normal valve closing or late valve closing. Selective reset is facilitated by a reset piston and a blocking piston disposed in a hydraulic circuit including a reset passage. In a non-resetting mode of operation, the blocking piston may block oil flow within the reset passage, regardless of the position of the reset piston, which facilitates late valve closing. An alternative embodiment includes a blocking sleeve disposed concentrically relative to the reset piston.
Claims21
A valve actuation system for conveying motion from a motion source to at least one engine valve in a valve train in an internal combustion engine comprising:
- a housing adapted to support components of the system;
- a lost motion component disposed in the housing for selectively conveying motion from the motion source to the housing, the lost motion component adapted to absorb motion provided from the motion source in a lost motion state;
- a reset component for resetting the lost motion component to the lost motion state;
- and
- a reset blocking component for selectively preventing reset of the lost motion component.
A method of controlling valve motion in a valve actuation system in an internal combustion engine, the valve actuation system comprising:
- at least one engine valve in a valve train in an internal combustion engine;
- a housing adapted to support components of the valve actuation system;
- a lost motion component disposed in the housing for selectively conveying motion from a motion source to the housing, the lost motion component adapted to absorb motion provided from the motion source in a lost motion state;
- a high-pressure hydraulic reset component for resetting the lost motion component to the lost motion state;
- and a reset blocking component for selectively preventing reset of the lost motion component, the method comprising:
- operating the high-pressure hydraulic reset component to reset the lost motion component and cause the lost motion component to absorb motion from the motion source;
- and
- operating the reset blocking component to block flow of high-pressure hydraulic fluid from the high-pressure hydraulic reset component and to thereby block reset of the lost motion component.
Dependencies are inferred from the claim text.