A dynamic model of the battery power unit of the electric truck MAZ-4381EE with a two-speed gearbox is considered. The dynamic processes arising at gear shifting are investigated. The gearbox is switched by controlling the rotational speed of the traction electric motor synchronously with the process of switching on the synchronized gear coupling of the gearbox. https://www.allfixelectricales.shop/product-category/coffee-machine-belt/