Design and testing of corn and soybean belt composite speed daptive seeding control system based on fuzzy PID
To solve the problem of poor uniformity of plant spacing caused using ground wheel drive in soybean and corn strip composite seeders and the inability of existing electric drive seeders to simultaneously sow two types of crop seeds,soybean and corn belt composite speed adaptive seeding control system was designed based on fuzzy PID.The system mainly consisted of an STM32 main controller,GPS/BD speed measurement module,human-ma-chine interaction equipment,and driving units.The CAN bus distributed control method was used to complete the command transmission between the main controller and various seeding units.A mathematical model of the motor drive signal and operation parameters was established,and the fuzzy PID algorithm was introduced to construct a closed-loop control system by using the speed difference as feedback and make the rotation speed of the soybean seeder and the corn seeder quickly and accurately follow the forward velocity changes of the seeder.The bench test showed that under constant speed operation,the coefficient of variation of rotational speed was less than 8.50%,and the coefficient of variation of plant spacing was less than 10.00%.During the dynamic speed control process,the speed tracking is good,and the coefficient of variation of plant spacing was less than 15.00%.After the intro-duction of the fuzzy PID algorithm,the qualified index of soybean plant spacing was greater than 92.00%,and the qualified index of corn plant spacing was greater than 94.00%.Compared with the absence of the algorithm,the qualified index of soybean plant spacing was increased by 2.03%,and the qualified index of corn plant spacing was increased by 1.59%.Field validation experiments showed that the qualified index of soybean plant spacing under motor drive was greater than 91.00%,which was 1.80% higher than that underground wheel drive operation.The qualified index of corn plant spacing was greater than 93.00%,which was 1.68% higher than that of corn plant spacing underground wheel drive operation.Therefore,this control system solves the problem of simultaneous sowing of two crop seeds by motor drive and improves the seeding performance.
万方数据
维普
