A HYDRAULIC CAMSHAFT AND A HYDRAULIC CONTROLLING SYSTEM THEREOF

摘要

A hydraulic camshaft and a hydraulic controlling system thereof include an ECU (14) and a solenoid valve (13). ECU respectively transfers four change signals to the solenoid valve (13) based a cam phase sensor (15) when the engine is running in the high and intermediate load status. The solenoid valve (13) respectively changes the oil pressure of the channels connected to the four hydraulic controlling parts on the camshaft basing on the signal. The statuses of the hydraulic controlling parts of the neighbor two cylinders are reversed. The change means that each cylinder is changed at the base circle position orderly. The invention is simple in structure and applied. The valve stroke is two segments. The engine performance and economical efficiency are improved, while the emission is reduced.