Dynamic Characteristics of a Three-port Regulator Valve Actuated by a Linear Solenoid

A 3-port regulator valve, actuated by a linear solenoid, has been used increasingly in advanced automatic transmission. This paper presents a study of the stability of such a valve. By using a static model, which includes notches and inner leakage, and a dynamic model, where air in oil considered, good agreement between calculated and experimental results is shown. This model was linearized and reduced to generate the pole configuration. Variance analysis of simulated step responses in the nonlinear condition indicates that there are some factors which strongly influence stability. It can be concluded that decreasing the sensitivity of regulator valves improves stability. In addition, it is shown that inner leakage has a significant effect on the stability, and notches affect the sensitivity of regulator valves.