| This article bases on the various parameter requirements of a domestic independent brand eight-speed AT(Automatic Transmission)automatic transmission and the problems of the original design electro-hydraulic control system,this paper optimizes the hydraulic schematic diagram of the electro-hydraulic control system,and compares the designed electro-hydraulic control system.The hydraulic control system was simulated and analyzed;then,on the basis of the simulation analysis,its main components were redesigned and developed,and the corresponding electro-hydraulic control module was made;finally,the control module sample was benched Test verification.The specific work content of this paper is as follows:(1)The structure and working principle of the eight-speed AT automatic transmission are introduced in detail.According to the shift logic diagram,the power transmission paths of the eight D and R gears are analyzed,and the hydraulic knowledge,design requirements and design requirements are combined.Originally designed the problem of the electro-hydraulic control system,the hydraulic schematic diagram of the electro-hydraulic control system was optimized,and the various subsystems in the schematic diagram were analyzed to determine the basic parameters of the hydraulic system.(2)Based on ANSYS Maxwell software,simulate the electromagnet in the proportional solenoid valve,which is the core component of the hydraulic system,and analyze the changes over time of seven physics such as current,inductance,and electromagnetic force under different input signals.The three parameters of the moving iron core quality,the number of coil turns and the iron core thickness are analyzed,and the influence of the different values of these three parameters on the electromagnetic force is obtained.Then based on the AMESim simulation software,the proportional solenoid valve mechanical,electrical,magnetic,and hydraulic multi-physical quantity coupling model is established,and the characteristic simulation analysis is performed on it.(3)Based on the AMESim simulation software,the structural design calculation and simulation verification analysis of the system pressure valve and the hydraulic torque converter control valve in the designed hydraulic system are carried out.The design simulation and clearance characteristic analysis of the pressure reducing valve are carried out.According to the previous design verification,build the overall simulation model of the hydraulic system and analyze the main oil pressure and clutch response.(4)Based on the AMESim software,a pilot-operated pressure reducing valve is designed to optimize the gap characteristics and response fluctuations of the pressure reducing valve,and its structural parameters are optimized after parameterization analysis.Set up a shift control loop to study the static response characteristics of the clutch under different parameters such as electromagnetic force,damping aperture,spool quality,and the effect of duty cycle on the dynamic response characteristics of the clutch oil pressure,and to shorten the response time for these parameters optimize.Finally,the optimized parameters are imported into the entire hydraulic system for comparative analysis before and after optimization to determine the necessity of optimization.Using UG software to perform three-dimensional modeling of the entire hydraulic system,and select the important spool valve model in the hydraulic system to discuss the compensation effect of the delayed response caused by the spring preload and control pressure on the additional friction of the spool.(5)According to the optimized hydraulic system and drawn three-dimensional model,the prototype is trial-produced,and self-developed hydraulic comprehensive test bench is used to test the designed prototype.The tests include solenoid valve characteristics,shift control loop,system pressure and torque converter response tests.The results prove the simulation accuracy and optimization effectiveness. |
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