关键词: 商用车；电控机械式自动变速器；换挡策略；发展趋势

Abstract: In recent years, the installed rate of Automated Mechanical Transmission (AMT) has been increasing year by year. This paper mainly introduces the structure principle, shifting strategy, self-learning function and shifting quality of AMT. In the analysis of the structural principle, the typical double intermediate shaft form is selected, and the characteristics of the integrated and external gear selection and shifting mechanisms are analyzed. In the analysis of the AMT shifting strategy, combined with the actual universal characteristic curve of the engine, two parameter shifting rules are introduced. AMT's self-learning function and shifting quality are also important aspects of measuring the performance of AMT. The article introduces three modes of self-learning. Combined with the current development trend, the future development trend of AMT in commercial vehicles is predicted.

Key words: Commercial vehicles; Automated mechanical transmission; Shift strategy; Development trend