Authors

Abstract

To address the issue of reduced comfort and operational accuracy in tractors caused by the clutch engagement process in combination with automatic transmissions, dual-clutch transmissions, and hybrid power tractors, a new method is proposed that considers both the slipping process and synchronous instantaneous control at the moment of engagement. In this method, the optimal engagement process model of the clutch considering the clutch sliding process and synchronous instantaneous control was established, and the optimal trajectory of the clutch engagement process was solved based on the pseudo-spectral method. Then, the optimization results were compared with those obtained without considering the synchronous instantaneous. The results show that the proposed method considering the sliding process and synchronous instantaneous constraint can reduce the frictional loss of the clutch by 9%, and suppress the impact to below 10 m/s³. Finally, this method was applied to the control of tractor starting up, gear shifting and hybrid power mode switching processes. Simulation results demonstrate that this method can be effectively applied to these three operating conditions.

Abstract in Chinese

为解决搭配自动变速器、双离合器变速器和混合动力拖拉机离合器接合过程导致的拖拉机舒适性和作业精度降低问题，提出了一种考虑滑摩过程和同步瞬间控制的新方法。在该方法中，建立了考虑离合器滑摩过程和同步瞬间控制的离合器最优接合过程模型，并基于伪谱法求解了离合器接合过程的最优轨迹。结果表明，考虑滑动过程和同步瞬间约束优化方法可使离合器的摩擦损耗降低 9%，并可抑制冲击降低到 10 m/s3以下。最后，将该方法应用于拖拉机起步、换挡和混合动力模式切换过程的控制，仿真结果表明，该方法能较好地应用于上述三种工况。