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针对拖拉机阻力控制系统这一复杂非线性系统，通过分析与实验确立了系统模型结构，并进而运用广义最小二来辨识方法（RGLS）建立了其完整的数学模型，从而认定了该系统是一个含死区非线性环节的三阶闭环系统。
Aiming at the complex nonlinear system of tractor resistance control system, the system model structure was established through analysis and experiment, and then its complete mathematical model was established by using the generalized least-squares identification method (RGLS) Third-order closed-loop system for dead-zone nonlinearity.