TRACTION CHARACTERISTICS OF ELECTRIC BUS POWER PLANT

https://doi.org/10.33815/2313-4763.2019.2.21.036-043

Abstract

Energy-efficient and energy-saving technologies have been recently increasingly used in transport industry. The shift to environmentally friendly technologies in transport industry is being promoted, and electric technologies became the most widespread among them. One of the main elements of electric transport is a propulsion power plant. The research on main traction characteristics of power plant of urban assignment electric bus was untertaken. Graphic correlations of propulsive force and speed of electric vehicles with a three-speed, two-speed, and single-speed gearboxes are presented. It is defined that the designs, being investigated, have the same propulsive force in relation to speed, which indicates that electric vehicles will have the same acceleration rates and climbing capacities. The analytical correlations are presented, which enable to determine the maximum driving gradient the electric vehicle is capable of at a certain speed. The acceleration efficiency of an electric vehicle is estimated by the time required to accelerate it from initial to final speed. Unlike electric buses, for light motor vehicles, the acceleration efficiency is more important than the maximum cruising speed and the climbing capability. The study of the main traction characteristics of the power plant of the city bus. The graphical dependences of traction force and speed of electric vehicle with three-stage, two-stage and one-stage gearbox are presented. It is determined that the investigated structures have the same traction force depending on the speed, this indicates that electric vehicles will have the same acceleration and the same ability to overcome the lift. Analytical ratios are presented to determine the maximum lift that an electric vehicle can overcome at a certain speed.