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The performance of Hydraulic Anti-lock Braking System (ABS) is important to vehicle brake safety. In this paper, finite element models and simulation models for studying dynamic response of solenoid valve, a critical part of ABS, are established. Based on the calculation results, which are proved in experiment, several effective methods for improving the performance of the solenoid valve are presented. Furthermore, an ABS-vehicle model is developed to study the influence of hydraulic ABS parameters on braking effect. The simulation results have good agreement with the data of in-vehicle driving experiments.

A low cost, anti-pollution pump/motor displacement-varying mechanism was studied in this paper. In the hydrostatic energy storage transmission system(HESTS), a variable pump (motor) unit was used to transfer the energy. A new pump/motor displacement-varying mechanism was obtained based on low price manual manipulating variable pump with high-speed on-off solenoid valves supporting pressure oil. Simulation results showed that the position precision and the ability of following sinusoidal wave signal of the new mechanism met the requirement of the pump/motor unit. Experiment results proved that the new pump/motor displacement-varying mechanism operated precisely and reliably.