A hydraulic apparatus for adjusting the timing of opening and closing of an engine valve

摘要

A hydraulic apparatus for adjusting the timing of opening and closing of an engine valve of a prior art has the drawback that sludge from the oil pressure chamber tends to accumulate on the inner surface of the housing of the actuator, which controls the rotor in a valve timing adjusting system for controlling the valve timing of the engine. This causes troubles in the operation of the rotor. In the present invention, while the fuel delivery to the engine (M1) is being cut off, the hydraulic media providing means (M10) is controlled by the timing advance control means M13 to rotate further the rotor from the position at the moment that the fuel delivery is cut off, so as to clean the inner side of the housing of the actuator (M9) , the control of the setting and the execution of the cleaning mode is carried out by a cleaning condition judging means (M14) . A mode exchange means (M15) controls the hydraulic media providing means (M10) to exchange its normal mode and the cleaning mode, according to the state of the engine.