AMT车辆坡道换挡策略与试验研究

Ramp Shift Strategy and Test Research on AMT Vehicle

提出了根据换挡后离合器接合时的发动机转速识别坡道行驶工况、根据当时的车速选择合适挡位的坡道换挡策略,并在装有AMT的某重型载货汽车上进行了坡道换挡试验。试验结果表明,车辆在坡道行驶过程中,虽然初次选择的挡位不一定能适应该坡道,但通过连续降挡或跳跃式降挡最终总能选择适合于该坡道的挡位。利用车辆现有的传感器,坡道换挡控制策略实现了坡道换挡控制,不仅满足车辆实际行驶工况的需要,而且使控制系统硬件得以简化。

A ramp shift strategy that identified the riding condition based on rotational speed of engine when the clutch was locked after shifting and chose the proper gear based on the vehicle＇s speed has been provided. The ramp shift test on one heavy truck with AMT was done, and the test results showed that by dropping gear continuously or discontinuously, the proper gear could be found eventually when the vehicle was running on ramp, though the original gear might be improper. Using existing sensors of vehicles, the ramp shift strategy achieved ramp shift control, which did not only match the need of vehicles＇ real riding condition, but also simplified the hardware of control system.