Simulation And Experiment Research On Dynamic Characteristic Of Automobile EHB Hydraulic System

At present, the requirements of the brake performance become higher and higher. The deficiency in traditional brake system can be made up by EHB(Electronic Hydraulic Brake System)as one of the new-boomed system, and the braking ability can be improved. The design for the control algorithm of brake chamber pressure is affected by the dynamic characteristic of hydraulic system, which is the executive part of automobile EHB. So the research on the dynamic characteristic of hydraulic system is basis for the design of automobile EHB system. Therefore the research on hydraulic system is significant and indispensable. The main work contents are as follows:(1) The simulation research on the dynamic characteristic of hydraulic system is carried out by the co-simulation platform which is based on AMESim and Matlab/Simulink. The response characteristic of solenoid valves, the pressure growth characteristic and the pressure drop characteristic of hydraulic system are successfully gained. The theoretical basis will be provided to the experiment research on the dynamic characteristic of hydraulic system.(2) The testing platform including the testing flat for hydraulic system and the testing system for the dynamic characteristic of hydraulic system are set up. The hardware and software are designed in the testing system. In this system, the communication between host computer and slave computer by CAN, the controlling of solenoid valves and data collecting of brake chamber pressure are achieved.(3) The experiment research on the dynamic characteristic of hydraulic system is carried out by the testing platform. In the result, the model of automobile EHB, which is built in AMESim, is proved to be right, meanwhile the response time of solenoid valves and the MAP for the control of brake chamber pressure are successfully gained.