Abstract
An analytical method of evaluating vehicle fuel consumption under standard operating conditions is presented. In the proposed model, vehicle fuel consumption is separated into two different operating modes: cruising at constant speed and acceleration. In each of these modes fuel consumption is calculated based on the instantaneous engine efficiency, approximated using an analytical function rather than typically considered consumption map. The approximation is based on speed-power decoupling, employing two single dimension polynomials instead of a two-dimensional lookup table. The adequacy and accuracy of the model is verified using experimental calculations. Moreover, it is shown that the effect of various design parameters on vehicle fuel consumption can be studied utilizing the proposed model.
Highlights
Evaluating fuel efficiency is an important procedure during ground vehicle design and operation.Based on this evaluation, usually performed via mathematical modeling and simulation, the main construction parameters of the vehicle may be determined at the design stage and steps to reduce fuelEnergies 2013, 6 consumption may be taken
It is usually represented by an appropriate two-dimensional lookup table, rather than obtained analytically
A similar two-dimensional map is often used for expressing engine efficiency rather than specific fuel consumption
Summary
Evaluating fuel efficiency is an important procedure during ground vehicle design and operation Based on this evaluation, usually performed via mathematical modeling and simulation, the main construction parameters of the vehicle may be determined at the design stage and steps to reduce fuel. Attempts for creating mathematical models for estimating fuel efficiency have been widely made in the literature It was proposed in [5,6] to evaluate fuel consumption QS measured in liters per 100 km via the following relation: QS g e ( Prl Pw Pa ). In this model fuel consumption is determined separately for two different vehicle operating modes: constant speed and accelerations. An analysis of the effect of various design and operational parameters on fuel consumption is carried out based on the model
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