Abstract
This study selects a China VI heavy duty vehicle for PEMS test, and Based on the measurement results of vehicle specific power (VSP) parameters, the VSP calculation formula applicable to this study is proposed , And analyzes the distribution characteristics of VSP, and at the same time according to the fuel consumption and emission data of the actual road driving process collected by the vehicle, The effect of VSP on vehicle fuel consumption and emission characteristics and the correlation between the two are studied. Results show that VSP of the vehicle are mainly concentrated in the interval -10 ≤ VSP ≤ 10kw / t, in which the vehicle driving time accounts for about 99.3% of the total time; the correlation coefficient between VSP and average fuel consumption is about 0.93, there is a strong correlation; The changes of CO, CO2, NOX and PN with VSP all show as that under the same absolute value of VSP, the pollutants emission rate in the VSP> 0 interval is higher than the VSP <0 interval, in which the correlation between VSP and CO, CO2, PN emissions is more strong, but poorly correlated with NOX emissions.
Highlights
Because there are many types of heavy duty vehicles and a wide range of using, their actual fuel consumption and emission performance are greatly affected by various factors such as road conditions, environment, vehicle type, and vehicle weight
Based on the actual road driving conditions of ChinaVI heavy duty vehicles, this paper uses the data collected by the portable emission measurement system (PEMS) test to put forward the vehicle specific power (VSP) calculation formula is suitable for this study, and analyzes the distribution characteristics of VSP in the test, and the impact of VSP on the vehicle's fuel consumption and emission characteristics, and the correlations between VSP and vehicle fuel consumption and emissions, in order to establish suitable for heavy duty vehicle VSP model provides theoretical basis
Using a China VI heavy duty diesel vehicle as the research object, the PEMS test of the actual road driving of the vehicle was carried out, and the VSP calculation formula suitable for this study was proposed, and draw corresponding conclusions: (1) The vehicle driving conditions are mainly concentrated in the interval -10≤VSP≤ 10kw / t, and its time ratio is about 99.3% of the total driving time
Summary
Because there are many types of heavy duty vehicles and a wide range of using, their actual fuel consumption and emission performance are greatly affected by various factors such as road conditions, environment, vehicle type, and vehicle weight. With the establishment and mature application of the vehicle specific power (VSP) model in light duty vehicles [4,5,6,7,8,9,10], the application of the VSP model that integrates the actual speed, acceleration, road and environmental parameters of the vehicle in evaluating the fuel consumption and emission performance of the motor vehicle is favored by many scholars at home and abroad. Based on the actual road driving conditions of ChinaVI heavy duty vehicles, this paper uses the data collected by the PEMS test to put forward the VSP calculation formula is suitable for this study, and analyzes the distribution characteristics of VSP in the test, and the impact of VSP on the vehicle's fuel consumption and emission characteristics, and the correlations between VSP and vehicle fuel consumption and emissions, in order to establish suitable for heavy duty vehicle VSP model provides theoretical basis. In the formula: v is the vehicle's driving speed, km / h; g is the acceleration of gravity, with a value of 9.8m / s2; f is the rolling resistance coefficient; αis the road slope, with a value of 0°;εis the quality factor, with a value of 0.1; a is the vehicle's driving acceleration, m / s2; ρis the density in the experimental environment, g / m3; τis the air resistance coefficient, A is the windward area of the vehicle, m2; vm is the wind speed in the experimental environment
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