干式双离合自动变速器车辆升挡过程发动机协调控制研究

Study on Engine Coordination Control of Upshift for the Vehicle with DDCT

为改善装有干式双离合自动变速器(DDCT)的车辆换挡时的驾驶体验,针对其换挡过程,提出了一种基于扭矩的发动机协调控制策略。首先根据变速器控制单元(TCU)的需求扭矩和发动机最优扭矩计算智能停缸的缸数,利用点火正时效率计算点火提前角的改变量;然后在MATLAB/Simulink上进行建模、仿真和优化,并对优化后的控制策略进行实车试验验证。结果表明,该控制策略能明显改善换挡时发动机的扭矩响应,缩短换挡时间,减小滑摩功损失和换挡冲击,明显提升了换挡品质。

In order to improve the driving experience of a vehicle equipped with a Dry Dual Clutch Transmission(DDCT) during gear shifting, a torque-based engine coordinated control strategy is proposed for the gear shifting process.Firstly, the number of cylinders deactivated intelligently is calculated according to the required torque of the Transmission Control Unit(TCU) and the optimal engine torque, and then the ignition timing efficiency is used to calculate the change in ignition advance angle;then model, simulate and optimize on MATLAB/Simulink, and then the optimized control strategy for vehicle test verification is used. The results show that the control strategy can significantly improve the engine’s torque response during shifting, shorten the shift time, reduce the sliding friction loss and the shift shock, and significantly improve the shift quality.