Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
EXPERIMENTAL ANALYSIS OF THE INFLUENCE OF AUTOMOTIVE AIR CONDITIONING IN FUEL CONSUMPTION IN LIGHT DUTY VEHICLES
Submission Author:
Iolanda Dias , MG , Brazil
Co-Authors:
Pompilio Furtado Filho, Lucas Leal, Ramon Molina Valle, Matheus Dias Bolognani Ferreira, Iolanda Dias
Presenter: Iolanda Dias
doi://10.26678/ABCM.COBEM2017.COB17-2114
Abstract
Automotive air conditioning (A/C) system causes higher fuel consumption in a car. In Brazil, emissions and consumption tests are performed in laboratories in exhaust emission benches equipped with roller dynamometers, running in driving cycle (FTP-75 for urban or HWFET for road cycle) with the A/C off. Due to the higher fuel consumption in vehicles with A/C on, the test procedure described in Brazilian standard for the urban cycle (ABNT NBR 6601) simulates the A/C influence by adopting the procedure of increasing 10% in all the coefficients of the equation that correlates resistive force with speed. That equation is obtained from track deceleration data and it is fed into the dynamometer control system. The purpose of this work was to measure the behavior of fuel consumption of two vehicles equipped with A/C through laboratory tests, running the FTP-75 cycle in order to evaluate if that 10% increase is a good estimation of the A/C effect. The results obtained in the experiments yielded a fuel consumption rise in the range of 15% to 19% with the A/C turned on, against only around 3% for the ones using the plus 10% on the resistive forces. Those results showed that, at least for the two car models used for this experiment (one 1.0 L, 4 cylinders and one 2.4 L, also 4 cylinders), the Brazilian standard simulation underestimates the influence of vehicular air conditioning in fuel consumption values.
Keywords
Vehicle emissions testing, Fuel consumption, automotive air conditioning system
