Development And Optimization Of High-speed On/Off Valve Based On AMT Pneumatic Servo System

In the areas of heavy truck or construction machinery,the vehicles are driven on the complicated and changeable roads,which require not only a wide-range transmission ratio,but also high safety and comfort.Therefore,AMT(Automatic Mechanical Transmission)system is generated.The electrically controlled pneumatic AMT system has the advantages of simple structure,convenient operation,environmental protection and economy.As the control component of this system,the high-speed on/off valve has a vital influence on it.The simulation model of AMT pneumatic servo system is built and in-depth researches,including the structure design,static and dynamic magnetic performance,steady thermal field and sonic conductance are employed as follows:Firstly,the combined simulation model in AMESim and Matlab is built according to the action characteristics of AMT pneumatic servo system and the performance parameters of high-speed on/off valve are obtained,such as switching frequency and sonic conductance.Secondly,the basic structure of valve is determined based on the switching frequency.The geometric parameters of valve hole are calculated according to the theoretical formula of sonic conductance.Thirdly,both static and dynamic magnetic simulations are employed in Ansoft Maxwell,not only to validate the rationality of valve’s magnetic field but also gain the switching frequency of armature.Fourthly,the steady thermal analysis of valve is carried out by ANSYS Workbench and the results show the coil temperature complies with the requirements.Furthermore,design of experiment is accomplished to confirm the parameters which have significant influence on armature suction.The multi-field coupling model of performance indexes is built and multiple objective parameter optimization is finished to obtain the optimized parameters.Finally,the experiment result shows the switching frequency of sample valve is approximate to simulation result.The measured temperature has a relative error of 3.85% compared with simulation result.The relative error of measured sonic conductance is about 5.80% compared with the calculated result.