电磁执行器直接驱动的AMT换挡机构

为提高机械式自动变速器（AMT）换挡品质并缩短换挡过程动力中断时间，提出了一种电磁直线执行器直接驱动的AMT换挡机构。换挡机构运动总质量为1.37 kg，较传统全电式AMT换挡机构总质量（约1.78 kg）降低23%。对换挡过程进行了分段研究，并在换挡过程数学模型和AMT试验台架基础上，验证了设计方案的可行性。换挡机构换挡过程中无选挡操作，可实现挡位切换时退、进挡同时进行的功能，转速差为500 r/min、转动惯量为0.03 kg·m2，换挡时3挡至4挡的换挡时间约为120 ms，提升了AMT的换挡品质，且仍有进一步提高的余地。研究表明，电磁直线执行器直接驱动的AMT换挡机构可实现自动换挡功能。

Shifting Mechanism of AMT Direct Driven by Electromagnetic Linear Actuator

In order to improve the shifting quality and reduce the shift time, a shifting mechanism for automated manual transmission (AMT) direct driven by electromagnetic linear actuator was proposed. Compared with the conventional AMT (about 1.78 kg), the total mass of shifting mechanism (1.37 kg) was reduced by 23%. The shift process was divided into several stages and the feasibility of design program was verified based on detailed mathematical models of shift process and the test bench of AMT. Gear select movement did not exist in the process of gearshift and it could make upshift and downshift happened in the same time. The 3~4 gearshift time was controlled at 120 ms when the rotary speed difference was 500 r/min and the moment of inertia was 0.03 kg·m2. The shifting quality of AMT was improved and could be further improved in the future. The results showed that the shifting mechanism of automated manual transmission based on electromagnetic linear actuator could achieve the functional of automatic shift, and it had well application prospect in the field of automatic transmission.