关键词: 玉米联合收获机, 清选系统, 智能控制, 损失率, 含杂率, 硬件在环

Abstract: The cleaning system of maize combined harvester is complicated and has the problems of poor harvest quality and low efficiency. Based on this, a set of automatic control system was designed, which mainly controlled the cleaning loss rate and simultaneously controlled the impurity content rate. Firstly, based on the orthogonal test data of fan speed, shaker speed and feeding amount as the influencing factors, loss rate and impurity content rate as the indicators, the primary and secondary factors affecting loss rate and impurity content rate were obtained, and the automatic control strategy of cleaning system was proposed. Secondly, in order to carry out the research of control strategy and algorithm, the mathematical models of the fan speed, the shaker speed regulating device and the longitudinal movement of the harvester in the cleaning system were established, and the discrete PID control algorithm was designed. Finally, based on the software and hardware environment of MATLAB/dSPACE, the hardwareintheloop simulation platform of the cleaning control system was built, and the controller in the loop test was carried out. The experimental results show that the dualobjective joint control strategy and control algorithm set in this paper can effectively reduce the cleaning loss rate and impurity content rate to the target range, in which the cleaning loss rate is about 2.7% and the impurity content rate is about 2.8%.

Key words:  corn combined harvester, cleaning system, intelligent control, loss rate, impurity rate, hardware in the loop