Research On Loading System Of Electric Power Steering System Test Bench Based On Pavement Spectrum

The electric power steering system not only optimizes the layout space,but also has the characteristics of energy saving,which effectively improves the performance of the steering system.It can obtain excellent road perception ability through the electronic control device.Combined with the advantages of the current electric power steering system,it has been widely developed and expanded.However,the construction of the test bench test device,which is a particularly important part of the research and development of the electric power steering system,is still insufficient.First,there is no steering system test bench suitable for commercial high torque.Second,there is no steering system test.Consider the influence of road conditions on the performance test of the steering system.In order to better optimize,update and develop the development work of the electric power steering system test bench suitable for high torque,this paper mainly studies the development work of the high torque electric power steering system test bench,and improves the steering under the influence of road conditions.The impact of the performance test of the system.The first two chapters of this paper firstly introduce the research process of the steering systems commonly used in vehicles,analyze the characteristics,advantages and disadvantages of different steering systems and commonly used models,and analyze the electric power steering system and experiments of the electric power steering system studied in this paper through the current development status at home and abroad.The research process of Taiwan has been elaborated.Combined with the characteristics of the electric power steering system,the necessity of building a test bench to test the steering system is analyzed,and the loading system suitable for this study is selected by listing the common loading methods of the steering system test bench.The third chapter builds a comprehensive test bench according to the research requirements of this project,selects the main components that make up the input system according to the method of loading the system on the test bench established in the second chapter,and selects the main components that make up the input system according to the conditions of the input end of the steering system,and completes the research on the reproduction of the road surface spectrum according to the needs.Design and check the gear-rack-ball joint rod-servo hydraulic cylinder integrated test bench loading system,and introduce the preliminary test requirements and methods of this test bench for the steering system in detail.The fourth chapter is to study the reproducibility of the comprehensive test bench of electric power steering system based on road spectrum.Combined with the designed rack and pinion transmission as the core loading system,the dynamic equation of the rack and pinion transmission system is established.Through MATLAB/Simulink,the dynamic modeling of the rack and pinion transmission system and the analysis of the reproduction of the road surface spectrum are completed.Improve the working conditions and reproduction conditions when the system includes backlash,and compare the different anti-disturbance situations of single rack and double rack structures in the case of backlash.Finally,the modal analysis of the loading systems of the two structures is carried out to find their modal characteristics in each frequency range,and the faults of the structural system are checked to eliminate the danger of generating large vibration stress.Finally,the most suitable structure for pavement spectrum reproduction is established.It lays a deep theoretical foundation for the subsequent investment in actual production to complete the construction of the experimental bench and conduct experimental verification.