Matching And Evaluation Of Braking System For An Electric Car

With the continuous development of vehicle information,intelligence,low-carbon and high-quality,the functions of passenger car brake system are constantly enriched,the system is more and more complex,the design cycle is shorter and shorter,and the product quality requirements are higher and higher,which makes the design requirements of brake system as far as possible to use simulation tools to discover the design in the early stage of design.Cheng's problem strengthens the core competitiveness of enterprises,and provides important conditions for the sustainable development of new products,especially the enterprise's own technology.Therefore,it is more and more important to introduce and apply model-based matching analysis and evaluation of braking system in the process of braking design.In this paper,the main research work of an electric power project is as follows:1.Based on the physical structure of brake system components,the dynamic models of brake,vacuum booster and pedal are built.The factors such as the rigidity of rectangular seal ring,the rigidity of clamp body,disc clearance and the rigidity of friction block are taken into account in the brake model,so that the fluid requirement of brake can be evaluated.The physical model of the rubber feedback disk,booster jump and the effect of vacuum on the initial power are considered.It can be used for parameter sensitivity analysis of parts,pedal sensation analysis and vacuum consumption analysis.The pedal model is based on the hard points of the brake pedal and the connecting parts.It can be used to analyze the force-transmission ratio of the brake pedal and to realize the displacement input control speed which is consistent with the sensory test of the brake pedal.2.The dynamic model of brake system components is built based on AMESIM,and the accuracy of the component model is checked by the bench test results.The vacuum tank volume is determined according to the evaluation criterion of the vacuum source performance of electric vehicle,and the key performance analysis such as the matching analysis of brake vacuum degree is completed.3.The vehicle model,tire model and brake system model are integrated and matched under AMEsim platform.According to the national standard and pedal sensation road test method,the dynamic braking efficiency and pedal sensation simulation are realized,and the influencing factors of pedal sensation are analyzed.4.Study the working principle of non-decoupled energy recovery system(RBS)and decoupled energy recovery system(CRBS).RBS has less modification to the original braking system and lower cost.In order to ensure braking comfort,only small feedback moment can be used;CRBS can achieve constant pedal feeling,better pedal feeling and energy return.The yield is higher.According to the principle of electro-hydraulic coordinated working control of energy recovery system,an evaluation method of braking performance of vehicle with energy recovery system is put forward.