Research On Stability Of Automobile Electronic Mechanical Braking System Based On ADAMS

Automotive Electronic Brake Mechanical(EMB)system is based on motor drive components as brake actuators,Instead of traditional hydraulic or pneumatic braking.As a new concept,it makes up for the shortcomings of traditional braking mode.On the basis of consulted a large number of domestic and foreign literature,ADAMS and ANSYS are used to simulate and analyze the braking performance of the rigid flexible coupling system of the EMB actuator.This paper focuses on the research of the stability of the EMB system actuator in braking,and builds the test platform to verify the analysis,which has the guiding significance to the development of the EMB system.Firstly,tirough the analyzed and compared of several typical domestic and foreign EMB system implementation schemes,combined with laboratory mass POLO target models identified EMB optimal structure form,completed the selection and design of concrete structure and completed 3D modeling and assembly work according to specific parameters.Secondly,the rigid flexible coupling dynamic simulation model of EMB actuator is established,and the influence of the brake disc and brake block deformation on the braking performance is considered.At the same time,the equivalent model of flywheel is established to make the rotational inertia of the whole vehicle is equivalent to a single wheel which simulated vehicle movement of single brake dynamics model.Then simulate the emergency braking situation under certain speed,and simulate the dynamics of the EMB system.Analysis of braking response time,clamping force,braking distance and other parameters.Compared with the theoretical calculation results and the national braking regulations,the results show that the design of the EMB system actuator selection meets the requirements of design and application.By setting up the experimental platform,a reasonable experimental scheme is designed according to the braking performance of EMB,and the actual performance of EMB is tested.Comparing the experimental results with the simulation results,the rationality of the design is further verified,which provides a reliable basis for the further research of the control algorithm.Finally,mainly through simulation analysis,the braking performance stability of EMB actuator system is predicted.This paper analyzes the characteristics of the friction pair and the influence of the braking torque fluctuation on the braking vibration noise in the EMB system.The results show that the larger the friction coefficient is,the more easily the braking chatter occurs in the EMB system,and the flutter speed is less than 10km/h.The braking power has a fluctuation when EMB system in the constant voltage input.The fluctuating braking torque causes the EMB system to aggravate the vibration of the brake disc.Instantaneous braking force fluctuations will cause instantaneous shock vibration of brake disc.Based on the analysis of the possible vibration noise in the EMB system,the key factors of the stability of the EMB system are obtained and the reasonable optimization suggestion are put forward.It provides a reference for early design and production of EMB system products.