Dual-pressure hydraulic valve-actuation system

Internal-combustion engines – Poppet valve operating mechanism – Hydraulic system

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137 1, 251 3001, 251 636, F16K 31122

Patent

active

060679468

ABSTRACT:
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.

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