基于压力稳定与限深减振的双调控免耕播种单体控制系统设计与试验OA

Aiming to address the issue that high-speed operation induces excessive vibrations of no-till seeding units,thereby deteriorating seeding quality,a dual-regulation vibration-reduction no-till seeding unit was developed based on downforce stabilization control and furrow-depth attenuation control.By integrating multiple sensors,including an inclinometer,a pin-shaft force sensor,and an angular displacement sensor,the system enabled real-time acquisition of the profiling angle,downforce cylinder thrust,and depth-limiting wheel arm rotation.Consequently,closed-loop regulation of the downforce hydraulic cylinder pressure and the damping cylinder displacement was achieved.Stable downforce output and impact-limiting damping control effectively suppressed unit vibration,enabling active regulation of downforce and seeding depth.A coupled co-simulation model of the dual-regulation hydraulic control system was constructed by using AMESim and Simulink.Simulation results indicated that PID,fuzzy-PID,and sliding-mode control(SMC)exhibited comparable performance in regulating the downforce cylinder force.However,for damping-cylinder displacement control,SMC demonstrated clear advantages over conventional PID and fuzzy-PID control,reducing the maximum overshoot by 5.56 percentage points and 2.01 percentage points,and shortening the settling time by 1.27 s and 1.45 s,respectively.A dual-regulation vibration-reduction test bench for the no-till seeding unit was built,and a downforce measurement model integrating profiling angle and hydraulic pressure was established.Experimental validation of the proposed control strategy showed that under different hydraulic pressures and four-bar linkage inclination settings,the coefficient of determination reached 0.94463 with an adjusted value of 0.93819,demonstrating high control accuracy of the seeding downforce.The findings can provide a theoretical foundation for vibration-reduction control of no-till seeding units.