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US 5,875,764 AGranted
Apparatus and method for valve control
AssigneesSiemens Aktiengesellschaft, Siemens Automotive Corporation
InventorsAndreas Kappel, Randolf Mock, Hans Meixner, Edward-James Hayes
Life of this patent
Estimating the term…
Abstract
An easily controllable primary drive (5) guided in a first bore (3), for example a piezo actuator, transmits its stroke by a piston-hydraulic stroke transmission with a hydraulic chamber (2) onto a stroke element (70) of the secondary side guided in a second bore (4). The pressure in a valve chamber (9) is controlled via the stroke element (7) of the secondary side.
Claims34
A device for valve control, the device having a primary side and a secondary side, comprising:
- a housing having a hydraulic chamber, a first bore and a second bore such that the first bore and the second bore discharge into the hydraulic chamber;
- a filling conduit via which the hydraulic chamber is pressure chargeable with a fluid;
- a primary drive that is arranged at least partially in the first bore axially displaceable and affected by leakage or in hydraulically sealing fashion;
- a stroke element that is arranged in the second bore axially displaceable and affected by leakage;
- a restoring element of the secondary side that presses the stroke element in the direction of the hydraulic chamber;
- a valve chamber that is connected via the second bore to the hydraulic chamber and into which the stroke element is displaceable;
- a throttled conduit via which the valve chamber is pressure-chargeable with the fluid;
- an outlet that is one of unpressurized or resides under a slight pressure;
- a surface of the stroke element exposed pressure-actively to the fluid in the hydraulic chamber in motion direction being smaller than a surface of the primary drive;
- a hydraulic friction connection between primary drive and stroke element;
- the valve chamber being closeable relative to the outlet by the stroke element.
8 more elements
A method for valve control, comprising the steps of:
- providing a first bore and a second bore that separately discharge into a hydraulic chamber in a housing;
- providing a primary drive in the first bore axially displaceable and affected by leakage or in hydraulically sealing fashion;
- providing a stroke element at least partially in the second bore axially displaceable and affected with leakage;
- the hydraulic chamber being fillable with a fluid via a filling conduit;
- the primary drive having a hydraulic friction connection with the stroke element via the hydraulic chamber;
- the hydraulic chamber being connected via the second bore to a valve chamber, whereby the valve chamber is fillable with fluid via a throttled feeder;
- providing a restoring element of a secondary side that presses the stroke element in a direction of the hydraulic chamber;
- providing an outlet;
- in quiescent position,
- displacing the primary drive maximally away from the hydraulic chamber,
- displacing the stroke element maximally in a direction of the hydraulic chamber thereby closing the valve chamber off from the outlet;
- during a stroke event,
- producing, via the primary drive, a volume of the hydraulic chamber, so that a first pressure of the fluid in the hydraulic chamber is increased until the stroke element is pushed stroke-translated away from the hydraulic chamber into the valve chamber,
- producing a connection between valve chamber and outlet is produced by the displacement of the stroke element, as a result whereof the fluid flows from the valve chamber into the outlet and a second pressure in the valve chamber thus becomes minimal;
- upon return into the quiescent position, producing the primary drive away from the hydraulic chamber, so that the first pressure therein drops, as a result whereof the stroke element is displaced in the direction of the hydraulic chamber until the quiescent position is again reached and the second pressure in the valve chamber is again maximally built up,
- compensating fluid losses in the hydraulic chamber via the filling conduit.
13 more elements
Dependencies are inferred from the claim text.