Abstract:

In order to explore the working characteristics of the pressure boosting valves and pressure reducing valves of the One Box Electro-Hydraulic Braking System (EHB), multi-field-coupled modeling and simulating methods of pressure boosting valves and pressure reducing valves were proposed, and results were verified by innovative testing bench. The structures and working principals of pressure boosting valves and pressure reducing valves were introduced. Each physical characteristic of pressure boosting valves and pressure reducing valves were precisely modeled. Multi-field coupling simulations, including electromagnetic field, flow field, and motion field, and experimental verifications for the pressure boosting valve were conducted. Simulations and experimental verifications were performed for the pressure reducing valve, including electric circuit, electromagnetic field, and motion field. The results show that the simulation error of the flow rate of pressure boosting valve is lower than 1.5 mL/s, the open delay response error of pressure reducing valve is smaller than 1.3 ms, and the close delay response error smaller than 0.3 ms, indicating that the proposed simulation method has a high accuracy, and providing a guidance for the control of the valves.

Key words: one box electro-hydraulic braking system (EHB), solenoid valves, pressure boosting valves, pressure reducing valves, flow characteristics, switch delay characteristics