Abstract: An electromagnetic valve includes a valve body, a valve core, and an electromagnetic drive device. The valve body has an operation chamber, wherein the valve core is movably arranged in the operation chamber. The electromagnetic drive device is arranged in the valve core and is suitable for being electrically connected with a power source. The electromagnetic drive device is arranged, when driving the electromagnetic valve, to provide the valve core with a starting drive so as to drive the valve core to enter a running state. After the valve core is driven to enter the running to state, to provide the valve core with a maintaining drive so as to keep the valve core in the running state.

Abstract: An engine valve actuation system comprises a camshaft, with at least one cam; a control shaft one; a control shaft two; and at least one valve actuation unit, each valve actuation unit further comprising: (i) at least one set of an engine valve and an engine-valve return spring; (ii) an lost-motion module, further comprising a collapsible high-pressure chamber, and operably converting the profile of at least one cam and the collapsing motion from the high-pressure chamber to corresponding movement of the at least one engine valve; and (iii) a hydraulic circuit, further comprising a trigger valve one and a trigger valve two, the two trigger valve being controlled respectively by the control shaft one and the control shaft two.

Abstract: A kind of variable engine valve control system with pressure difference comprises hydraulic supply equipment, hydraulic actuator apparatus, valve and spring controlling piston balance. The hydraulic actuator comprises hydraulic cylinder, piston and piston rod. The piston rod is coupled and moved with the valve. It is characterized by that the said piston divides the hydraulic cylinder into upper chamber and lower chamber. The said hydraulic supply equipment is connected with the upper chamber of the hydraulic cylinder through the fluid inlet pipe and the said lower chamber of the hydraulic cylinder is connected with the hydraulic supply equipment through the pressure difference proportional relief valve.

Abstract: A kind of variable engine valve control system with pressure difference comprises hydraulic supply equipment, hydraulic actuator apparatus, valve and spring controlling piston balance. The hydraulic actuator comprises hydraulic cylinder, piston and piston rod. The piston rod is coupled and moved with the valve. It is characterized by that the said piston divides the hydraulic cylinder into upper chamber and lower chamber. The said hydraulic supply equipment is connected with the upper chamber of the hydraulic cylinder through the fluid inlet pipe and the said lower chamber of the hydraulic cylinder is connected with the hydraulic supply equipment through the pressure difference proportional relief valve.