Study On Realization Of Electrical Simulation For Mechanical Inertia Based On Brake Test Bench

With the rapid economic growth in recent years,the car plays an important role in modern life,so it becomes more and more important to ensure the safety of the car.Accurate simulation of vehicle inertia is an important prerequisite for all safety performance testing.The traditional inertia simulation method is achieved by installing a pure mechanical flywheel on a test-bed braking system,it has some shortcomings such as low level of automation and short accuracy of inertia.In order to improve the accuracy of inertia simulation,a new method of inertia simulation is proposed called electrical simulation for mechanical inertia.In this paper,the control algorithm of the electrical simulation inertia is improved based on the test-bed braking.In this paper,the torque control method is taken as research basis,the control strategy of the torque control method is deduced,and the structure is obtained,and the characteristics of the torque control method are analyzed theoretically.In term of the problem that the torque control method can't realize automatically compensation for the resistance in the actual process,the corresponding free parking test are conducted for the impact of system resistance,and the data is processed from an energetic standpoint.A dynamic torque compensation during brake test is applied based on the relationship obtained by the free parking test analysis between the system resistance and the spindle rotate-speed.In order to improve the accuracy of the simulated inertia,this paper presents a new control method called angular acceleration control method which introduces the PID controller.The angular acceleration control method can realize the automatic compensation of the system resistance,and has strong anti-interference ability.In this paper,the control principle of the angular acceleration control method is deduced in detail,and the structure is given as well.According to the mathematical model obtained from the theoretical analysis,the system simulation model of torque control method and angular acceleration control method are established respectively by Matlab/Simulink simulation software.The correctness of the algorithm is vertified by simulation experiments which are carried out under the same test conditions.The PID parameters in the simulation test of the angular acceleration control method are adjusted by the critical ratio method.In the engineering practice,on the basis of the data from the simulation,which can adjust the setting according to the actual engineering situation.In this paper,the angular acceleration control method and the torque control method are applied to the practice platform to verify the algorithm.Through the simulation test and the practical engineering application of the results,the angular acceleration control method of the electrical inertia can more effectively improve the accuracy of the simulated inertia.In the practical platform application,the fluctuation range of the error can also be reasonably controlled in the 2% F?S,which means the method has a good application value.