초록 ▼

A system and a method for hydraulic actuation of poppet valves. The poppet valve is opened by application of hydraulic pressure to a piston, and is closed by action of a mechanical spring. Hydraulic pressure comes from either a high pressure source of a low pressure source, the low pressure source b

A system and a method for hydraulic actuation of poppet valves. The poppet valve is opened by application of hydraulic pressure to a piston, and is closed by action of a mechanical spring. Hydraulic pressure comes from either a high pressure source of a low pressure source, the low pressure source being higher than ambient pressure. Application of hydraulic pressure is made by a pressure control device based upon signals received from an electronic controller. Hydraulic pressure is applied in a way that minimizes the power required to actuate the valve by making use of valve inertia.

대표청구항 ▼

[ What is claimed is:] [2.] A system for hydraulically actuating a poppet valve between an opened position and a closed position, comprising:a first spring constructed and arranged for biasing the poppet valve to the closed position;a second spring constructed and arranged for biasing the poppet val

[ What is claimed is:] [2.] A system for hydraulically actuating a poppet valve between an opened position and a closed position, comprising:a first spring constructed and arranged for biasing the poppet valve to the closed position;a second spring constructed and arranged for biasing the poppet valve to the closed position, wherein said first spring and said second spring are arranged in series;a cylinder having an inlet;a piston slidably engaged in said cylinder, one side of said piston operatively engaged the poppet valve, and the opposite side of said piston forming a volume in said cylinder and being in fluid communication with the inlet;a source of high pressure fluid;a source of low pressure fluid, said low pressure source being at a pressure greater than ambient pressure;a controller for applying control signals; anda means for controlling cylinder pressure in response to control signals, and having a first fluid connection to said low pressure source, a second fluid connection to the inlet, and a third fluid connection to said high pressure source, whereby application of a first control signal puts the first and second fluid connections in fluid communication, and application of a second control signal puts the second and third fluid connections in fluid communication.