Study On The Energy Recovery And Feeding System Of Heavy Card

With the rapid development of automobile industry,energy exhaustion and environmental degradation are worsening,the demand for cars is transformed from practical to energy-saving and environment-friendly,which also includes the heavy truck.Due to the high energy recovery efficiency,low manufacturing cost and high maneuverability,the hydraulic braking energy recovery as an energy-saving technology in the automobile industry is gradually valued.The control system of hydraulic hybrid power directly determines whether the whole system can operate normally.Therefore,the research on the energy recovery control system of heavy-card hydraulic brake is of great value.Aimed at the control problem of the hydraulic braking energy recovery system for the hydraulic braking of heavy trucks,an ECU controller based on 32-bit and auto-grade chip KEAZ128 is developed.The main work of the thesis can be divided into the following aspects:(1)On the basis of consulting a large amount of relevant literature,this paper summarizes the development status of vehicle hydraulic braking energy recovery technology at home and abroad,combined with the actual needs of the enterprise and the national standards.Finally the scheme of hydraulic braking energy recovery and regeneration system is established and the structure and working principle are also expounded.(2)The working characteristics of main components of hydraulic braking energy recovery system are analyzed and the corresponding mathematical model is established.MATLAB/simscape software is used to establish the system simulation model and the key parameters affecting the recovery of brake energy are simulated,which provides theoretical basis for the selection of components,the hydraulic pump/motor displacement of brake energy recovery parameters was optimized by genetic algorithm and the design of control strategy is instructive.(3)Design the system controller.Based on the analysis of the hydraulic braking energy recovery and regeneration system,the thesis complete the hardware design of the controller.To make the controller fully functional and the software programs such as sampling,communication and self-recovery are further completed,the reliability and precision of the control system are improved by composite filtering and first-order inertia filtering.(4)The bench experiment of hydraulic braking energy recovery and regeneration control system was carried out,the function and reliability of the system are verified.The results show that the controller system can realize vehicle braking energy recovery and feed,which proves that the ECU control strategy is effective.The thesis is based on a multi-stage controllable hydraulic pump/motor as a hydraulic braking energy recovery and regeneration system for energy recovery and power synthesis components,designing and exploiting the control system,and it was experimentally validated,the better experimental results are obtained.