Dynamic Modeling and Experimental Verification of Bus Pneumatic Brake System

摘要

The dynamic characteristic of pneumatic brake system is very important, so the full-parameter model of thepneumatic brake system was established on the base of the technology of computer simulation. Its key brake componentsinclude brake valve, relay valve, diaphragm brake chamber and pneumatic circuit. AMESim was first introduced on thebasis of mathematical derivation. So the multivariable complexity derivation, nonlinear mathematical relationship can beavoided. The model can be used for the bus brake system multi-parameter simulation and design. A pneumatic brakesystem test-bed was designed to verify the accuracy of the model. It can measure the dynamic characteristic and the outputresponse coordination of each component. It was showed that the simulation results were fit to the experiment results. Forthe deviation, the explanation and analysis were also given. The response hysteresis of the brake system is mainly causedby the rubber diaphragm deformation in brake chamber. This research laid the foundation for the further structuraloptimization of brake components and fitness analysis of the pneumatic brake system.