Valve apparatus for an internal combustion engine
A method includes coupling a cylinder head to a cylinder block. A valve member is then moved into a valve pocket defined by the cylinder head such that a first stem portion of the valve member engages an actuator. A first portion of the biasing member is then disposed against a second stem portion of the valve member, the second stem portion being opposite the first stem portion. An end plate is then coupled to the cylinder head such that a second portion of the biasing member engages the end plate.
1. A method, comprising:
actuating an actuator at a first time to move a valve within a cylinder head of an internal combustion engine from a closed position to a first open position, the valve including a tapered portion defining a plurality of valve flow passages being in fluid communication with a cylinder and a gas manifold when the valve is in the first open position;
varying a stroke of the valve to establish a second open position different than the first open position; and
actuating the actuator at a second time to move the valve within the cylinder head of the internal combustion engine from the closed position to the second open position, the plurality of valve flow passages being in fluid communication with the cylinder and the gas manifold when the valve is in the second open position.
2. The method of claim 1 , wherein:
a first gas flows between the gas manifold and the cylinder at a first flow rate when the valve is in the first open position; and
a second gas flows between the gas manifold and the cylinder at a second flow rate different than the first flow rate when the valve is in the first open position.
3. The method of claim 1 , wherein the actuator is a pneumatic actuator.
4. The method of claim 1 , wherein actuating the actuator includes energizing a solenoid.
5. The method of claim 1 , wherein a distance between the closed position and the first open position is greater than a distance between the closed position and the second open positions.
6. The method of claim 1 , wherein a portion of the cylinder head is disposed between the valve and a combustion chamber of the internal combustion engine.
7. The method of claim 1 , wherein the valve is configured to move independently of a crankshaft of the internal combustion engine.
8. An apparatus, comprising:
a valve having a portion movably disposed within a valve pocket defined by a cylinder head of an engine, the portion of the valve defining a flow opening, the valve configured to move relative to the cylinder head a distance between a closed position and an opened position, the valve and the cylinder head collectively configured such that a gas can flow between a manifold and a cylinder of the engine via the flow opening when the valve is in the opened position; and
an actuation assembly including a first actuator and a second actuator, the actuation assembly configured to engage the valve to move the valve between the open position and the closed position, the actuation assembly configured to vary the distance between the open position and the closed position.
9. The apparatus of claim 8 , wherein
the gas flows between a manifold and a cylinder of an engine via the flow opening at a first flow rate when the distance is a first value; and
the gas flows between a manifold and a cylinder of an engine via the flow opening at a second flow rate when the distance is a second value, the second flow rate different from the first flow rate.
10. The apparatus of claim 8 , wherein the portion of the valve is tapered.
11. The apparatus of claim 8 , wherein at least one of the first actuator and the second actuator is pneumatic.
12. The apparatus of claim 8 , wherein the actuation assembly is configured to engage the valve in response to the actuation of a solenoid.
13. The apparatus of claim 8 , wherein the flow opening is a first flow opening, the valve defining a second flow opening.
14. An apparatus, comprising:
a valve having a portion movably disposed within a valve pocket defined by a cylinder head of an engine, the portion of the valve defining a plurality of flow passages, the valve configured to move within the valve pocket a distance between a closed position and an opened position, a manifold of the engine being in fluid communication with a cylinder of the engine via the plurality of flow passages when the valve is in the opened position; and
an actuation assembly including a first actuator and a second actuator, the actuation assembly configured to move the valve between the open position and the closed position, the actuation assembly configured to vary a flow rate of a gas through the plurality of flow passages when the valve is in the opened positioned.
15. The apparatus of claim 14 , wherein the actuation assembly is configured to vary the distance between the closed position and the opened position.
16. The apparatus of claim 14 , wherein the portion of the valve is tapered.
17. The apparatus of claim 14 , wherein at least one of the first actuator and the second actuator is pneumatic.
18. The apparatus of claim 14 , wherein the valve is configured to move independently of a crankshaft of the internal combustion engine.