Research On Key Technologies Of The Cycle Fatigue Test-bed Of Automotive Constant Velocity Universal Joint

Automotive constant velocity universal joint is an important safety component, their performance and quality directly affects the safety and reliability of the vehicle.Therefore, need the performance test-bed to detect the automotive constant velocity universal joint's torsional fatigue strength to ensure that the design of constant velocity universal joints meet the requirements.The key technologies of the automotive constant velocity universal joint's cycle fatigue test-bed were studied in this paper.Firstly, collect and analyze the general situation of the test-bed of automotive constant velocity universal joint at home and abroad, outlining the key technical problems the test-bed that need to address, and put forward the research topic and research work to compete the paper.Secondly, research one by one about the key technical problems of the test-bed of automotive constant velocity universal joint need to solve. These key technical problems mainly include:Be the first to application the technology of enclosed test-bed for the test-bed of automotive constant velocity universal joint in China. Test bed adopts the structure of the two parts in series, though the support of speed ratio gear box and connections form closed loop, complete the analysis of the working principle and structure design of the test-bed of enclosed automotive constant universal velocity joint. Be the first to application the technology of electro-hydraulic proportional hydraulic for the test-bed of automotive constant velocity universal joint in China. This paper introduced the scheme and design of test-bed's hydraulic transmission and the loading system, analyzed the impact phenomenon produced by the hydraulic transmission and loading system during work and the reasons for the phenomenon, then put forward solutions.To analyse the impact phenomenon's characteristics of hydraulic transmission and loading system, application the software tool of AMESim, respectively established the simulation model of hydraulic transmission and loading system and its load. The value of each parameter in the model were chosen and determined, and dynamic simulation was carried out.Design and simulation analyse the calibration section of control system.To analyse the characteristics of sudden change and time-varying in the hydraulic transmission and loading system when they are actual loaded, added calibration section in the control system calibration and choose the PID control strategy and fuzzy PID control strategy. Then use the way of AMESim and MATLAB/Simulink co-simulation, establish the simulation model of control system, and analyzed the simulation results of control system which added the calibration section. The results showed that the fuzzy PID control is more easily to overcome the influence of time-varying load on impact.