Study On Hardware-in-the-loop Simulation Test-bed Of CVT

With the development of economy, the automobile already become the important part of modern civilized society. The various performance of automobile have been highly required because of the development of automotive industry. The excellent performance of Metal Belt CVT that can continuously change ratio exceedingly improve the control and comfort of car, and also advance the performance of economy. The CVT as vehicle's ideal transmission equipment has extensive development future and market space.To improve the transmission of CVT, and obtain right control arithmetic, people try various way and means. But the advance of CVT's transmission can not run short of test. So more and more people begin to regard the test means. It is simple and effective way to test the capability of CVT that put CVT on automobile. But according to this way must spend time and cost, and that can not accomplish some test of extreme instance. If we adopt Hardware-in-the-loop simulation Test-bed to test CVT, can solve the above problem.The paper firstly analyse the basic structure and principle of CVT, and according to analyse the process of transmission search the best way to test CVT. In succession , introduce the theory of hardware-in-the-loop simulation, and by analyzing this simulation, indicate that it is possible and superior method that using hardware-in-the-loop simulation test the Power-train Performance of CVT.Then, combining the performance with transmission of CVT and the theory of hardware-in-the-loop simulation, design the hardware of Test-bed on the basis of comparing the basic performance of different element. And on the basis of accomplishing the design of hardware, analyse the control arithmetic of Test-bed, and that improve PID. When compile the code of control program, for the sake of offering academic guidance, detailedly research the establishment of control mode, and that design the flow of control program on the basis of MATLAB/Simulink mode.Finally, test and analyse the control capability of hardware on Test-bed. Following, analyse the correctness of the Test-bed according to comparing the experimental result of vehicle with CVT and Test-bed. At the end of this paper, simulate and analyse a CVT product and appraise the Power-train Performance of this CVT. The paper is based on the"Continuously variable transmission (CVT) electronic and hydraulic control system research"project. This project is undertaken by Hunan Jianglu&Rongda Vehicle Transmission CO., LTD. It's one of the important research plans of Hunan province, its number is 05GK2007.