Research On Control Strategy Of Electric Tractor Drive System

With the energy crisis and environmental pollution becomes more and more serious, the electric tractor as traditional tractor alternative product development very fast for the electric tractor is environmental friendly and low use cost, and so on the like. It is very important to study the control strategy of the electric tractor drive system to improve the efficiency of the whole machine, and it also meets the needs of the industrial development in the future.First, the analysis of the electric tractor equipped with no mathematical model of the brushless DC motor, and motor direct torque control strategy was established, and the motor body and control model was established in Matlab / Simulink, simulation results show that, under this control strategy, the motor torque ripple became small, fluctuating velocity decreases. Secondly, the force of track type electric tractor under various working conditions is analyzed, and the corresponding mathematical model is established, and the simulation model of the whole machine is established. In the transportation and plowing the fuzzy self-adjust PID control, the limp home control strategy in the failure mode. The simulation results show that, in the transport operation, the speed of the vehicle can track the target speed very well, and the correction torque and the load change are basically the same, and the speed of the vehicle is maintained at the target speed. In the failure mode, the battery SOC changes significantly slowed the control objectives to achieve the limp home. Driving on the prototype of limp, plough test. Test results show that the prototype of a mu of arable land is only 4.93 yuan, the economic benefit is obvious. Can travel according to a predetermined speed in the limp while driving, the SOC value decreased slowly, to complete the control target of the limp home.