小型稻谷脱粒机动力控制系统开环控制策略的研究

Investigation into Open-loop Control Strategy of Power Control System for Small Rice Thresher

研究某小型稻谷脱粒机动力控制系统的开环控制策略。采用"逐步回归法"和"方差扩大因子法"得出功率和发动机转速为节气门开度模型的主要影响因素,并拟合了模型的多元线性回归方程。实验结果表明,回归方程拟合精确度高,预测值与观测值之间的相对误差都低于5%。利用回归方程取代节气门开度的MAP图进行开环控制编程,应用新控制系统后,超调量下降了7.69%。

A study on open-loop control strategy of power control system for some small rice thresher was carried out.The power and engineer speed were selected as the effect factors of throttle percentage model by the analysis basis of stepwise and variance inflation factor,and a multivariate linear regression equation for model was fitted.The result shows the regression has a high accuracy,and the relative errors between the observations and predictions are less than 5%.The regression instead of map of throttle percentage can be used to software programming for open-loop control,and the overshoot is down by 7.69% based on the application of new control system.