The improvement of the limitation algorithm of the fuel consumption of the public transport buses equipped with air conditioning units

Abstract

The technical operation processes of modern public transport buses equipped with air conditioning units are advisable to be considered as a complex dynamic system, the functioning of which occurs under the influence of various random factors affecting the fuel consumption. This is a combination of the internal processes in the bus and the influence of external factors. At the present stage of the public transport buses design improving, the current system of the technical operation of vehicles requires the essential improvement and justification of new approaches to the development and the limitation of the fuel consumption. The impact factors of the technical condition and the traffic management is, first of all, an issue of the proper management of operation. At the same time, the issue of traffic management (the city conditions, the season, the number of buses on route, zero usage of a vehicle, etc.) is not an overriding one, since it is difficult to classify them by a separate numerical value and it is enough to regulate their impact by certain specific parameters.
This paper shows the results of the research of a thermal comfort in the public transport bus compartment and mathematical relation regarding the calculation of the fuel consumption under the operation of an air conditioning unit. It follows from the analysis of the research that the factors that have the greatest impact are: the bus congestion, the environmental conditions and the design features of the bus (thermal insulation, the area of visible and non-visible interior elements). A mathematical model of calculation of the standard values of the fuel consumption by the bus MAZ-206 on route both the air conditioning unit turned on and off is proposed. The algorithm of the additional fuel consumption under the operation of air conditioning unit is obtained. The basic rate for the bus MAZ-206 was established. This rate can be used for the supplement to the basic regulatory document “Rates of fuel and lubricant consumption for motor vehicles”.
Key words: public transport bus, air conditioning unit, microclimate, environmental conditions, fuel consumption.