The article presents electric drives calculation of the new hybrid sweeper. Due to the increasing restrictions of CO2 emission it is desirable to have zero emission sweeper operating in city centers. Outside of city centers, where regulations are not strict, there is an opportunity to start the auxiliary engine and charge the battery pack. Considering range, gradeability, maximum vehicle speed and gross vehicle weight, it is difficult to achieve the same performances as a conventional sweeper. Currently, the energy density of diesel fuel is more than 50 times higher than the energy density of batteries. An additional challenge for engineers is inadequate charging infrastructure, hence electric vehicles still need subsequent time for charging. In addition, hybrid sweeper requires more frequent charging than the average personal vehicle due to additional drives mounted on the sweeper.
A special characteristic of the considered hybrid sweeper is its relatively high maximum speed and high continuous torque demand along with gross vehicle weight of 4500 kg. The article deals with appropriate utilization of the main electric drive regarding given requirements.
The sweeper model is developed by considering main forces that act on the vehicle including rolling resistance, aerodynamic drag, incline force and inertia. By using vehicle model and randomly generated road grades, the simulation of sweeper has been performed. Likewise, the simulation of a centrifugal fan drive is developed. Finally, the intermittence of hydraulic drives is used to define requirements of an electrohydraulic drive.

Hybrid electric vehicle, road sweeper, traction motor, electric motor drive, centrifugal fan drive, intermittence.