Dual intake valve system with one deactivation valve and one multi-lift valve for swirl enhancement
AssigneeDelphi Technologies, Inc.
InventorsRichard B. Roe, Jongmin Lee
Life of this patent
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Abstract
In a dual intake valve arrangement for an internal combustion engine, a variable valve lift system controls two intake valves for one or more engine cylinders. In each cylinder, one of the intake valves includes an associated two-step actuation device, and the other includes an associated valve deactivation device. To improve in-cylinder air flow turbulence, one valve may be operated in a high-lift or low-lift state while the other valve may be deactivated.
Claims19
A system for variable actuation of first and second intake valves of a cylinder in an internal combustion engine having a camshaft, comprising:
- a selectively locked two-step actuation device operatively engaging the camshaft and said first intake valve, said two-step actuation device having a high-lift operational state in which said first intake valve reaches a maximum lift open position and a low-lift operational state in which said first intake valve reaches only to an open lift position intermediate a closed position and said maximum lift open position, selective locking of said two-step actuation device placing said two-step actuation device in one of said high-lift and low-lift operational states, selective unlocking of said two-step actuation device placing said two-step actuation device in the other of said high-lift and low-lift operational states;
- and
- a selectively locked valve deactivation device operatively engaging the camshaft and said second intake valve, said valve deactivation device having an activated state of operation in which said second intake valve reaches an open position and a deactivated state of operation in which said second intake valve remains in a closed position, selective locking of said valve deactivation device placing said valve deactivation device in one of said activated and deactivated states of operation, selective unlocking of said deactivation device placing said valve deactivation device in the other of said activated and deactivated states of operation.
An internal combustion engine having a camshaft and having first and second intake valves per cylinder, comprising a system for variable actuation of said first and second intake valves including:
- a selectively locked two-step actuation device operatively engaging the camshaft and said first intake valve, said two-step actuation device having a high-lift operational state in which said first intake valve reaches a maximum lift open position and a low-lift operational state in which said first intake valve reaches only to an open lift position intermediate a closed position and said maximum lift open position, selective locking of said two-step actuation device placing said two-step actuation device in one of said high-lift and low-lift operational states, selective unlocking of said two-step actuation device placing said two-step actuation device in the other of said high-lift and low-lift operational states;
- and
- a selectively locked valve deactivation device operatively engaging the camshaft and said second intake valve, said valve deactivation device having an activated state of operation in which said second intake valve reaches an open position and a deactivated state of operation in which said second intake valve remains in a closed position, selective locking of said valve deactivation device placing said valve deactivation device in one of said activated and deactivated states of operation, selective unlocking of said deactivation device placing said valve deactivation device in the other of said activated and deactivated states of operation.
A method of introducing a mixture charge into a combustion chamber of an engine cylinder, the cylinder including a first intake valve and a second intake valve for introducing the mixture charge into the combustion chamber, comprising:
- selecting a first valve lift position for the first intake valve that is only one of a high-lift position corresponding to a high-lift operational state and a low-lift position corresponding to a low-lift operational state;
- opening the first intake valve to the selected first lift position;
- selecting a second valve state of operation that is only one of an activated state of operation corresponding to the second intake valve reaching an open position and a deactivated state of operation corresponding to the second intake valve remaining closed;
- and
- operating at the selecting second valve state of operation.
Dependencies are inferred from the claim text.