Design and performance experimental of vehicle electromagnetic hydraulic braking system
                                             XIE Jun1, LIU Cunxiang1,2, LIU Xuejun1,3, MO Weihua1
（1.Department of Automobile Engineering, Guangxi Vocational & Technical College of Communication,Nanning 530216, China; 2.School of Automobile and Traffic Engineering, Jiangsu University,Zhenjiang 212013,China; 3.Guangxi Key Laboratory of Automobile Component and Vehicle Technology,Guangxi University of Science and Technology, Liuzhou 545006, China）

Abstract: Aiming at the shortcoming of the automobile retarder, such as large volume，big weight and installation difficulty, electromagnetichydraulic braking system(EHYS) was proposed. Through distributing vehicle braking torque and electromagnetic torque reasonably, abrasion of braking system was decreased, service life was prolonged, and the problem such as thermal failure and wading failure of vehicle braking system was solved. By analyzing the synchronous adhesion coefficient and ground attachment conditions of EHYS, the ideal braking distribution curve and control curve of fourwheel braking device were found. By using the approach of sliding model variable structure control velocity control on EHYS, the bench and road experiment was presented.The results indicate that EHYS could adjust the braking torque based on different braking force by sliding model variable structure control and realize the function of ABS by controlling the current intensity of coil in electromagnetic braking system, which could shorten distance effectively and ensures braking safety.

Key words: electromagnetichydraulic braking system(EHYS); service life; performance experimental; vehicle performance