RESEARCH ON CONTROL SYSTEM OF ELECTRIC-DRIVE WHEAT SHALLOW-BURIED DRIP IRRIGATION AND WIDE-WIDTH PRECISION SEEDER

To achieve precise seeding and fertilization operations for wheat and improve the intelligent level of wheat shallow buried drip irrigation and wide-width precision seeder, this article proposes a fusion speed measurement method by integrating ground encoder and satellite positioning module, and designs a control system of electric-drive wheat shallow-buried drip irrigation and wide-width precision seeder. The system includes STM32 main controller, DC servo motor, servo motor reducer, wheel encoder, vehicle navigation positioning module, vehicle control terminal, attitude sensor, voltage conversion module, etc. Based on the VisualTFT platform and equipped with a multi-functional touch screen, by designing the overall functions of terminal including obtaining speed from ground wheel encoder, obtaining speed from vehicle navigation positioning module, automatic switching of seeding mode speed source, motor speed control model, and remote transmission of positioning information, the system achieves the precise seeding and fertilization by adjusting the seeding/fertilization speed according to the forward speed of the tractor. The experimental study investigated the working performance of the control system of electric-drive wheat shallow-buried drip irrigation and wide-width precision seeder. Calibration test results showed that the speed accuracy of the ground wheel encoder was above 97.00%, The average seeding rate and fertilizer application rate were 22.4 g/r and 157.4 g/r, the standard deviations were 1.1 and 3.3, respectively. Field trial results showed that the seeding rate control error ranged from 3.0% to 5.3%, and the fertilization amount control error ranged from 3.0% to 6.0%. It meets the requirements for precise seeding and fertilization operations of shallow-buried drip irrigation and wide-width precision wheat seeder.