联合油压控制的DCT升挡控制策略研究

针对某履带车辆的双离合器自动变速器(DCT)的升挡过程,对其进行动力学分析,建立各阶段动力学方程,总结分析传统升挡过程控制方法。基于传统方法的缺点提出基于双离合器联合油压控制的升挡控制策略,并运用Matlab/Simulink建立动力传动系统仿真模型。在升挡过程中,均通过比例控制高挡离合器的充油油压,分别运用传统控制方法与联合油压控制方法控制低挡离合器放油油压,对仿真结果进行对比分析。结果表明,联合油压升挡过程控制换挡平稳,防止了系统负转矩的产生,且滑摩功较小,提高了换挡品质。

Study on DCT up-shift control strategy with united control

The up-shift process of the DCT adopted on a tracked vehicle is taken as the research object.The up-shift dynamic equations are derived according to the detailed analysis of up-shifts and the traditional up-shift control strategies are summarized.A new up-shift control strategy with united pressure control is proposed based on the traditional control methods.Two analytical models for simulation are built by means of Matlab/Simulink.During the up-shift process,the oil pressure in on-coming clutch is controlled by a proportion controller,while the oil pressure in off-going clutch is controlled by the traditional method and the new method with united pressure control respectively.It’s found that compared with the traditional method,united pressure control method can avoid negative torque and produce less friction work,which results in better shift quality.