基于城市循环工况的双离合器式自动变速器同步器的控制策略

The Synchronizer Control Strategy for Dual Clutch Automatic Transmission Based on City Drive Cycle

基于装备双离合器式自动变速器(Dual clutch automatic transmission,DCT)车辆的整车参数、发动机的转矩模型和油耗模型,设计了DCT的最佳燃油经济性换挡规律。根据DCT同步器在换挡过程中可预先接合的特点,在保证同步器可准确实现其功能的前提下,参考两参数换挡规律的曲线,提出了DCT同步器的控制规律。分析了DCT车辆在城市循环工况行驶时车速及油门变化的特点,制定出同步器的具体控制方法,绘制出控制框图,编写出控制程序。利用DCT车辆的硬件在环试验台,对ECE+EUDC城市循环工况下DCT同步器的控制性能进行了测试。控制结果表明,在正常行驶工况及发生频繁换挡的工况下,所制定的控制方法均可实现同步器的准确控制。此外,该控制方法可减少同步器分离、接合的次数,节约了能耗,提高了同步器的使用寿命。

Based on vehicle parameters, engine torque and fuel consumption models of the car equipped with dual clutch automatic transmission （DCT）, the optimal fuel economy shifting schedule of DCT is designed. According to the characteristic that synchronizers of DCT can be engaged in advance during the shift process, the control schedule of DCT synchronizers is put forward on the basis of the devised shifting schedule, which ensures the synchronizers can be accurately operated. Moreover, the variation characteristic of the speed and accelerator pedal when DCT vehicle drives in city drive cycle is analyzed, then, the specific control method of DCT synchronizers is put forward and the control diagram is described. The control results of DCT synchronizer in ECE＋EUDC drive cycle are tested by using hardware in the 10op simulation methods（HIL）, and the test results indicate every synchronizer can be precisely implemented in city drive cycle and even in some extreme condition such as quickly step ping on or releasing the accelerator pedal, furthermore, the unnecessary engaging and disengaging process can be eliminated, the merits of the control strategy are validated.