To meet the requirements of uninterrupted power shifting and smooth gear changes for heavy-duty vehicles,this paper designs a power-shift transmission control system.Utilizing AMESim software,the hydraulic shifting module of the transmission is analyzed,focusing on hydraulic system pressure characteristics,vehicle speed,impact force,and dynamic properties of clutch/brake friction.Simulation results demonstrate that the system meets the demands for power shifting.Additionally,a bench test was conducted to validate the designed hydraulic shifting system.In the comparison between simulation and experimentation,the target vehicle speed response time of the simulation result was advanced by 2.67 s,the C2 oil pressure response time was advanced by 0.09 s with 13%reduction in shift time,while the C1 oil pressure response was delayed by 0.07 s,exhibiting pressure overshoot.The test results indicated poor oil pressure stability,0.06 s advancement in torque curve response time,and a significant amplitude increase in the impact force curve.Despite these differences,the test results were generally consistent with the simulation results,confirming the accuracy of the simulation.
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