Title:
VARIABLE VALVE SYSTEM OF INTERNAL COMBUSTION ENGINE AND CONTROL METHOD THEREOF, AND HYDRAULIC ACTUATOR
Document Type and Number:
WIPO Patent Application WO2004085858
Kind Code:
A8
Abstract:
A variable valve system of an internal combustion engine, a method of controlling the variable valve system, and a hydraulic actuator, the hydraulic actuator comprising a hydraulic piston, a hydraulic cylinder, and a hydraulic source, wherein the hydraulic piston has a larger pressure receiving area on the control chamber side of the hydraulic cylinder than on the oil supply chamber side thereof and a slot, in the outer peripheral part thereof, axially passed from the oil supply chamber side to the control chamber side and having a groove sectional area axially varying according to the axial displacement of the hydraulic piston, a control chamber has a pilot valve, the opening and closing of the valves such as the suction and exhaust valves of the internal combustion engine are performed by the hydraulic actuator through a coupling and a valve spring, and the opening/closing timings, opening/closing times, and lift amounts of the valves are variably controlled, whereby the variable valve system of the internal combustion engine capable of eliminating cams and sensors, reducing a power consumption, increasing a response speed, and smoothly controlling a seating speed, the method for controlling the variable valve system, and the hydraulic actuator can be provided.
Inventors:
TANAKA HIROHISA (JP)
Application Number:
PCT/JP2003/016035
Publication Date:
July 07, 2005
Filing Date:
December 15, 2003
Export Citation:
Assignee:
YOKOHAMA TLO COMPANY LTD (JP)
TANAKA HIROHISA (JP)
TANAKA HIROHISA (JP)
International Classes:
F01L9/10; F02D13/02; (IPC1-7): F15B15/14; F01L9/02; F02D13/02
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