摘要
针对轮式拖拉机的液压转向系统 ,提出了由中央控制器、脉宽调制放大器、比例阀控缸、转向执行机构构成的电液转向系统的数学模型 ,该模型是在假定液体不可压缩、滑阀无摩擦、零开口的基础上线性化的 ,线性化模型采用 MATL AB Simulink进行仿真 ,并通过野外实车运行验证。结果表明 ,对系统死区、饱和、时间延迟进行补偿的三阶线性化模型 ,在转向角为 [- 10°。
Aimed at the hydraulic steering system of a wheel tractor, a mathematic model to simulate the electrohydraulic steering system is presented. The model is composed of a CCU, a PWM driver, a ratio valve control servo mechanism and a steering executor. The model was linearized based on the assumptions of incompressible fluid, critical lapped valve, and frictionless spool motion, simulated using MATLAB Simulink and validated on field steering tests. The results indicate that a linearized model of third order, which compensate for the system deadband, saturation, and time delay, is capable of satisfactorily representing the dynamic responses of the E/H steering system within steering angle range of -10° and +10°. It provides a necessary reference for the electrohydraulic steering system design of a wheel tractor.
出处
《农业机械学报》
EI
CAS
CSCD
北大核心
2003年第5期32-34,42,共4页
Transactions of the Chinese Society for Agricultural Machinery
