主办:陕西省汽车工程学会
ISSN 1671-7988  CN 61-1394/TH
创刊:1976年

Automobile Applied Technology ›› 2025, Vol. 50 ›› Issue (9): 83-87.DOI: 10.16638/j.cnki.1671-7988.2025.009.016

• Testing and Experiment • Previous Articles    

Current Analysis and Optimization of Shifting Motor for a Dual-Clutch Transmission Vehicle under Low Temperature

LIU Xiaogen, ZOU Hui, XIONG Bing, GUO Tongyuan, HAN Yue   

  1. Ningbo Geely Royal Engine Components Company Limited
  • Published:2025-05-13
  • Contact: LIU Xiaogen

某双离合变速器汽车低温下换挡电机电流 分析及优化

刘小根,邹慧,熊冰,郭桐源,韩月   

  1. 宁波吉利罗佑发动机零部件有限公司
  • 通讯作者: 刘小根
  • 作者简介:刘小根(1977-),男,硕士,高级工程师,研究方向为新能源标定匹配

Abstract: In view of the phenomenon of large shifting motor current in dual-clutch transmission vehicles at low temperature, this paper analyzes that it occurs when changing the first gear according to the problem condition. According to the use scenario, there are four working conditions when changing the first gear. First, 2-1 shifting in the process of D gear deceleration, and the shifting mechanism has the action of changing the first gear. Second, R gear (R gear+pre-mounted N gear) decelerates to about 4 km/h and then changes D gear (1 gear+pre-mounted R gear), and the shifting mechanism has the action of changing 1 gear. The third is R gear (R gear+pre-mounted N gear) slow down and stop (R gear+pre-mounted 1 gear), and the shifting mechanism has pre-mounted 1 gear action. Fourth, D gear decelerates to about 3 km/h speed (2 gear+pre-hanging N gear), change R gear (R+pre-hanging 1 gear), and the shifting mechanism has pre-hanging 1 gear action. According to the real vehicle verification, the large motor current occurs in the fourth working condition. According to the control logic of the dual-clutch transmission system, this paper limits the engine torque in a suitable range by software calibration, which can effectively reduce the shifting motor current and shift force. Finally, through risk assessment and real vehicle verification, the scheme can meet the requirements of drivability.

Key words: dual-clutch transmission; low temperature; shift gear; motor current

摘要: 文章针对双离合变速器汽车出现的低温下换挡电机电流大的现象,根据问题工况分析 出是在换 1 挡时发生。根据使用场景得到换 1 挡时有四种工况:一是 D 挡减速过程中 2-1 换挡,换挡机构有换 1 挡动作;二是 R 挡(R 挡+预挂 N 挡)减速到 4 km/h 车速左右后换 D 挡(1 挡+预挂 R 挡),换挡机构有换 1 挡动作;三是 R 挡(R 挡+预挂 N 挡)减速停车(R 挡+预挂 1 挡),换挡机构有预挂 1 挡动作;四是 D 挡减速到 3 km/h 车速左右(2 挡+预挂 N 挡),换 R 挡(R+预挂 1 挡),换挡机构有预挂 1 挡动作。根据实车验证,电机电流大发生在 第四种工况。文章根据双离合变速器系统的控制逻辑,通过软件标定在预挂 1 挡时限制发动 机扭矩在合适的范围内,可以有效地降低换挡电机电流,减小换挡力。最终通过风险评估和 实车验证,该方案能满足驾驶性的要求。

关键词: 双离合变速器;低温;换挡;电机电流