Performance Simulation And Test Of The Automobile Electro-hydraulic Braking System

With the problems of energy, environment, safety and congestion becomingincreasingly urgent, green and smart car is becoming a hot topic. But there are higherrequirements for chassis dynamics control system. Green Smart car requires braking systemto reduce or cancel the dependence on the engine vacuum. And brake feeling is affected bythe regenerative braking. These new requirements are difficult to be achieved on traditionalcar braking system. This leads to the emergence of a new generation of braking system. Hereare two types of new generation braking systems that are able to meet the aboverequirements:1) Hydraulic brake-by-wire systems-Improvement mainly on the basis of thetraditional automotive brake cylinders;2) Mechanical brake-by-wire system–Revolution on the traditional vehicle brakingsystem. Each wheel is equipped with a set of electrically controlled actuators.The research is from state863projects, combined with some of the results fromcommercial scientific and technological cooperation projects, as well as research status athome and abroad. The paper develope wire hydraulic brake system for the Pentium brand ofpure electric vehicles. This paper focuses on issues related to the design, modeling,simulation, prototype testing, vehicle dynamics and control of the braking system program.The main work is introduced as follows:1) A novel electro hydraulic braking system for the Benteng electric vehicle is proposedand the principle behind it is expounded thoroughly. Besides, a control architecture schemebased on this new braking system is designed.2) A physical mathematical model of the drive-by-wire hydraulic brake system isestablished. The model identifies the key parameters affecting system characteristics andillustrates the correlation between those parameters. A simulation model of the brakingsystem is built in the AMESim simulation platform. Simulation parameters related to thesystem are carefully matched. Besides, the static and dynamic response characteristics of themotor and the braking system are analyzed, which provides theoretical support and test basefor optimization, design and manufacture of the hydraulic braking system prototype. 3) An integrated hydro-mechatronics braking system test platform is designed anddeveloped. The basic features of brushless dc motor are tested. Then pressure boosting,pressure retaining, pressure reducing experiments are conducted on test platform Theresults are summarized and analyzed;4) This paper also studies the matching problem between the vehicle model and thedriving-by-wire hydraulic braking system. Then, the vehicle stability control strategy isdesigned based on this particular braking system. Parameters are obtained and set up throughinverse analysis of the characteristics of each link. Afterwards, simulation tests in high andlow adhesion roads designed according to the test requirements of the Unite States FMVSS126”sine stagnation” regulation are carried out to verify the effect of ESP.