Abstract: For the demand of linear pressure of anti-lock braking system, this paper establishes the force balance model of the core of a high-speed switch solenoid valve, and presents the linear incremental differential expression near the valve core balance state, and builds the mathematical model of the pressure changes of the hydraulic cylinder, and provides the incremental expression of hydraulic cylinder pressure difference, and obtains the transfer function about the pressure and electric current of force control system of the high-speed switch electromagnetic valve. Through the finite element analysis to the electromagnetic field and flow field of a high-speed switch electromagnetic valve. The curves about changes of electromagnetic force and fluid pressure on the valve core, and the changes of flow following the opening of the valve port can obtain. By researching the relationship between electromagnetic force, the pressure and flow, elaborating the linear pressure basic principle of the force control system of high-speed switch electromagnetic valve, and providing the stable conditions of force balance point, the control manner to achieve the linear pressure is presented. A high-speed switch valve model is set up combined with the analysis results to the flow field and electromagnetic field, and simulates the opening process of the electromagnetic valve, and operates linear pressure tests, and verifies the feasibility of the constant flow output under this control manner and the validity of simulation calculation methods and results.

Key words: force control system, high-speed switch solenoid valve, liner pressure, valve controlled cylinder