温度预测补偿控制的分动器动力传递特性研究

Research on Power Transfer Characteristics of Transfer Casewith Temperature Prediction Compensation Control

分动器是智能四驱汽车的关键部件,由于转矩传动过程中干扰因素较多,且其中温度的变化尤为重要,如何准确评估温度的影响对分动器的转矩输出至关重要。针对这一问题,首先通过预测分动器接合过程中摩擦片、线圈和润滑油的温度变化,建立了分动器温度控制模型;在此基础上,构建了分动器试验平台,并通过从试验台获取的测试数据与前馈控制器实现温度补偿协同控制,建立分动器温度反馈补偿时滞控制系统,研究温度影响下的分动器动力传递特性。最终探明:与对偶钢片多次摩擦接触后,摩擦片的温度明显升高,对分动器传递转矩的影响较大;控制电流与分动器转矩输出基本呈线性变化,叠加反馈补偿控制后,分动器的动力输出时间减少了0.05 s,控制误差基本消失,为分动器的精准控制提供了理论依据。

Transfer case is an essential component of the intelligent four-wheel drive vehicle,and its performance is affected by various factors during the process of torque transmission,especially by temperature change.Hence,it is crucial to evaluate the effect of temperature change on the torque output of transfer case accurately.In order to solve this problem,firstly,by predicting the temperature change of the friction plate,coil and lubricating oil during the transfer case joining process,the transfer case temperature control model is built.On this basis,the transfer case test platform is constructed.By the temperature compensation cooperative control of the test data obtained from the test platform and the feed forward controller,a temperature feedback compensation control system with time-delay of transfer case is built to analyze the dynamic transfer characteristics of transfer case under the influence of temperature.The results show that once the friction plate contacts the steel disk for many times,the temperature of the friction plate increases significantly,which has a significant impact on the torque transmission.The control current is linear related to the torque output of the transfer case basically.Considering the feedback compensation control,the output time of the transfer case power decreases by 0.05 s and the control error is nearly zero.This research can provide a theoretical basis for the accurate control of the transfer case.