电动车I-AMT挡位切换电机-离合器协同控制

Motor-Clutch Cooperative Control During Gear Shift Process for I-AMT of Electric Vehicle

摘要:

纯电动汽车匹配两挡变速箱能够改善整车动力性和经济性，由于其具有结构精简和无动力中断的优越性，因此高挡位摩擦离合器与低挡位单向离合器组合的传动构型成为电动汽车两档变速器的主流方案。然而，车辆在倒挡行驶时，需要挂入牙嵌离合器才能克服单向离合器只能传递单方向扭矩的问题。本文以一款基于牙嵌式离合器的新型无动力中断两挡自动变速器（I-AMT）为研究对象，协同控制驱动电机和倒挡执行机构电机使牙嵌式离合器平稳快速结合。针对驱动电机系统响应延时问题，使用史密斯预估器算法对控制系统进行预估补偿，并通过实验对控制策略进行验证。结果表明，该控制策略可有效避免牙嵌式离合器挂入时的冲击，保证了变速器可在短时间内在各个挡位之间平顺切换。

Abstract:

Pure electric vehicle equipped with two-speed gearbox has a better drivability and economy performance. Due to the simplified structure and no torque interruption during the gear shift process， the configuration that combines friction clutch for high gear and one-way clutch for low gear has become the mainstream scheme of two gear transmission of electric vehicles. However， when the vehicle is driving in reverse gear， the dog clutch should be engaged to overcome the problem that the one-way clutch can only transmit torque in one direction. A novel two-speed automatic transmission （I-AMT） without power interruption based on dog clutch is taken as the research object， and the synergistic control of power motor and reversing actuator motor make the dog clutch act smoothly and quickly. To address the response delay problem of the power motor， the Smith estimator algorithm is used to estimate and compensate the control system. The control strategy is verified by experiments， and the results show that the control strategy can effectively avoid the vehicle jerk when the jaw clutch is engaged， which ensures the smooth gear shift of the transmission in a short time.