| As a key actuator in the electro-hydraulic braking system of an automobile,its performance directly determines the accuracy and reliability of the braking system.Research on the performance of solenoid valves is of great engineering application and theoretical research value to improve the overall performance of electro-hydraulic braking systems.This article analyzes the temperature rise characteristics and dynamic response characteristics of the solenoid valve in the electro-hydraulic braking system,and optimizes the structural parameters of the solenoid valve.The main work of the article is as follows:1)A performance test platform for the temperature,electromagnetic force and dynamic response time of the solenoid valve was established,and the physics model of the solenoid valve was analyzed using the module division principle.The structure and working principle of the electro-hydraulic brake system and solenoid valve are clarified,the temperature characteristics and dynamic response characteristics of the solenoid valve are analyzed,and the physical field of the solenoid valve is modeled and analyzed by applying the module division principle.The multi-field coupling model of the solenoid valve was established by the metasoftware and the numerical simulation platform.2)Analytical calculation methods and finite element calculation methods for predicting the temperature rise characteristics of solenoid valve coils are studied,and the influence of the structural dimensions of the skeleton,end cover and yoke components on the temperature rise of the coils is analyzed.An analytical calculation method for the heat conduction of hollow cylinders under the third type of boundary conditions was derived.The error between the analytical calculation results and the test values was less than 5?.A finite element model of the temperature field of the solenoid valve coil was established.The maximum error is 7?.The influential factors of coil temperature rise were analyzed by the method of analytical calculation and finite element model.3)The dynamic characteristics of the solenoid valve of the electro-hydraulic braking system are studied,and the sensitivity of the control parameters and structural parameters of the solenoid valve to its dynamic characteristics is analyzed.The main performance indicators and mathematical models of the dynamic characteristics of the solenoid valve were clarified.The Simulink simulation model of the dynamic characteristics of the solenoid valve was established.The dynamic response time of the solenoid valve was calculated and experimentally verified.The maximum relative error of the loading response time was 11.1%,and the maximum relative time of the unloading response time was relatively large.The error is 8.8%.The effects of the control parameters and structural parameters of the solenoid valve on its dynamic response time were analyzed using the full factor test and orthogonal test method.4)An optimization design method for the structural parameters of the solenoid valve was established,and the dynamic response characteristics of the solenoid valve were optimized.The model sample points were obtained by orthogonal experimental design,and an approximate model of the dynamic response time of the solenoid valve was established by least squares regression.The multi-objective genetic algorithm was used to optimize the mathematical model of the solenoid valve dynamic characteristics and multi-objective optimization.A maximum improvement method was proposed to select the Pareto optimal solution set,so that the optimization effect of the dynamic response characteristics of the solenoid valve was maximized.After optimization,the loading response time of the solenoid valve was reduced by 18.7%,and the unloading response time was reduced by 11.6%. |
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