二段形電気油圧圧力比例弁に関する研究

抄録

Automotive automatic power transmissions have pressure control valves which control the pressure of wet-clutches or band-brakes. Recent transmissions have replaced hydromechanical valves with electrohydraulic valves for the improvement of shift quality at gear changes. A conventional proportional pressure control valve is controlled by a solenoid with a triangular leakage path of magnetic pressure control valve is controlled by solenoid with a triangular leakage path of magnetic flux which causes lower is controlled by a solenoid with a triangular leakage path of magnetic flux which causes lower reproducibility and productivity. It is difficult for a single stage valve to control high flow rates. Here, we have designed a new type of proportional solenoid with a rectangular leakage path in a magnetic circuit with the aid of FEM analysis, and control a secondary valve by a primary valve with a spool of 2mm in diameter. The dynamics of the valve and the pressure control system are simulated by bond graphs which manipulate nonlinear elements symbolically.