Modeling of Dynamic Processes of Electric Truck MAZ-4381EE Power Unit Using MATLAB Simulink Software Package

Abstract

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. When simulating the processes of gear shifting, dynamic loads, time of clutch engagement and synchronization of rotation frequencies of gearbox links, work and power of slipping of friction elements of the synchronizer are estimated. According to the simulation results, the necessity is shown for using feedbacks for controlling the traction electric motor and state parameters of synchronized gearbox couplings, and an algorithm is proposed for controlling the power electric drive of the electric truck, which provides minimum dynamic loads in the electric drive and low load of gearbox synchronizers.

Keywords

• electric truck
• battery power unit
• traction electric motor
• two-speed gearbox
• gear shifting
• synchronizer
• gear coupling