Research On High Power Hydraulic Retarder Design And Brake Torque Control Algorithm

The hydraulic retarder is one of the most popular auxiliary braking devices. Because hydraulic retarder can provide great brake torque at high speed, it is necessary to use hydraulic retarder on heavy vehicle high speed brake. Based on the project of the vehicle transmission national key lab, this paper studies on optimizing design and brake torque control of hydraulic retarder. The main study includes:Based on CATIA redevelopment platform, according to one-dimensional flow theory, the hydraulic retarder 3D parametric design module has been set up. Due to the performance target, the fit design parameters will be selected, then the 3D model is generated automatically by this parameters.Meshing the flow filed generated by 3D model, simulates hydraulic flow filed characteristics by CFD calculation. According to simulation results, the final design parameters of hydraulic ratarder are determined. The simulation result will be verified through the hydraulic retarder prototype test. The pressure field generated by CFD simulation could be imported into IEA software, to analyze the structure strength. Adjust the turbine structure due to strength analysis result.The design thread is:based on CFD analysis and combine one-dimensional flow theory. According to performance target and some projected parameters, select other key parameters based on one-dimensional flow theory. By using the redevelopment platform of CATIA, the parametric design is approached, which avoids a large number of manual calculation and complicated modeling.Analyze the structure and principle of hydraulic retarder oil charging/discharging control system. Based on this physical system, the AMESim based model is set up. The system oil charging & discharging characteristics are analyzed by simulation.This paper get the basic law based on one-dimensional flow theory and according to the statistical analysis of test data to get the more law of hydraulic retarder working pressure, firstly present that the oil discharging flow area is a important factor of work pressure. The neural network (ANN) is applied to get the model in order to get good extrapolating ability. This model method presents a new thinking thread for the modeling which is difficult set up by traditional theory.Builds the vehicle braking dynamic model, the hydraulic braking torque control is analyzed through co-simulation. The simulation result will be compared with braking test result. In order to improve constant torque performance, system parameters are adjusted.This paper presents a Parallel Fuzzy-PID control algorithm for the first time. The genetic algorithm is applied to optimize the controller parameters. The Parallel Fuzzy-PID control is proved to be have better adaptive ability on different brake condition than PID control by simulation.