Authors

Abstract

In order to better detect the working parameters of the seed metering device and further improve the performance of the seed metering device, a set of test-bed control system of seed metering device based on fuzzy PID was designed. The PID parameters are mainly used for on-line fuzzy self-tuning to realize the dynamic adjustment of the speed of the seed metering shaft, so as to ensure the fast adjustment of the speed of the seed metering device. Through the simulation of conventional PID control and fuzzy PID control by matlab, the response curve of the control system is obtained. From the response curve, it can be seen that the step response time of fuzzy PID control is about 0.15s, which is much higher than that of conventional PID control, and the work is stable and there is no overshoot. The bench test is carried out in the laboratory and the fuzzy PID control system is applied to the test-bed, and the actual speed regulation effect of the motor and the performance indexes of the seed metering device test-bed are obtained. The bench test shows that when the fuzzy control system is used to carry out the seed metering device test on the test bench, the qualified grain distance index of the seed metering device is maintained above 91%, the coefficient of variation of the qualified grain distance is less than 4%, the missing sowing index is less than 7%, and the replay index is less than 5%. All meet the national standard requirements of single-grain precision seed metering device.

Abstract in Chinese

为了更好地实现对排种器的工作参数进行检测，进一步提高排种器性能，设计了一套基于模糊PID的排种器试验台控制系统。主要应用PID参数进行在线模糊自整定实现排种轴转速的动态调节，从而保证排种器转速的快速调节。通过matlab对常规PID控制与模糊PID控制进行仿真，得到控制系统的响应曲线，由响应曲线可以看出，模糊PID控制的阶跃响应时间约为0.15s，较常规PID控制有较大幅度提升，且工作稳定，无超调量。在室内进行台架试验并将模糊PID控制系统应用在试验台上，得到电机实际调速效果以及排种器试验台的各项性能指标。台架试验表明，应用模糊控制系统在试验台上进行排种器试验时，排种器的合格粒距指数均维持在91%以上，合格粒距变异系数在4%以下，漏播指数在7%以下，重播指数在5%以下，均符合单粒精密排种器的国标要求。