Simplified model of city bus dynamics as a tool of an energy consumption estimation

Abstract

This paper presents a model of city bus dynamics as a tool of energy consumption estimation. This tool can provide preliminary parameters which enable estimation of transient states of the main elements of energy flow, especially the ones which are possible to be recovered (exhaust, cooling and brakes). The introduction describes the current state of affairs in simplified models of city bus dynamics. A concept of easy-to-use procedure of acquiring a real driving cycle as a velocity at time domain is presented. By combining this information with city bus dynamics model it is possible to build a model of this system in Matlab/Simulink environment. The influence of the main assumed parameters on accuracy of estimated parameters has been considered here. Measured average fuel consumption and producer data (maximum vehicle speed, time of acceleration) was used as the reference parameter. Then a procedure of tuning the simulation model according to the reference parameters is explained. In the following chapter there were presented simulation results based on real measurements of Lodz city traffic parameters and main groups of the city bus energy consumption possible to be recovered have been estimated.