Andrews GE

Bell MC

Daham BK

Li H

Ropkins K

Tate JE

Exhaust emissions were measured under real-world urban driving conditions using a set of in-vehicle FTIR emission measurement system, which is able to measure 65 emission components simultaneously at a rate of 0.5 Hz. The test vehicle was a EURO 2 emission-compliant SI car equipped with real-time fuel consumption measurement and temperature measurement along the exhaust pipe across the catalyst allowing the matching of thermal characteristics to emission profiles and monitor fuel consumption. The temperature profile indicated that the light-off of the catalyst took about 150\mA200 seconds. The warm-up of the lubricating oil and coolant water required a longer time than the catalyst did. The impact of ambient temperatures on lubricating oil and coolant water warm-ups was greater than that on the light-off of the catalyst. The heat loss and energy balance were calculated during the whole cycle period. The influence of cold start on fuel consumption was investigated. The exhaust emissions were also investigated as a function of warm-up time and temperature

Newcastle University E-Prints

Study of the emissions generated at intersections for a SI car under real world urban driving conditions

A precision in-vehicle tail-pipe emission measurement system was installed in a EURO1 emissions compliant SI car and used to investigate the variability in tail-pipe emission generation at an urban traffic junction. Exhaust gas and skin temperatures were also measured along the exhaust pipe of the instrumented vehicle, so the thermal characteristics and the efficiency of the catalyst monitored could be included in the analysis. Different turning movements (driving patterns) at the priority T-junction were investigated such as straight, left and right turns with and without stops. The test car was hot stable running conditions before each test, thereby negating cold start effects. To demonstrate the influence of the junction on tail-pipe emissions and fuel consumption, distance based factors were determined that compared the intersection drive-through measurements with steady speed (state) runs. Fuel consumption was increased at intersections by a factor of 1.3~5.9. CO, THC and NOx emission were increased by a factor of 8~26, 6~21 and 2.5~10 respectively. Benzene emissions were also increased by a factor of 4~21. Through fine-scale analysis of real-world driving profiles and tail-pipe emissions, this research makes a contribution to our understanding of the variability in driving parameters and emission production in urban areas. The results of this study will be useful in advising the development of combined traffic/ emission models for urban areas and developing optimal traffic management strategies to minimise emissions

Daham B

Study of the Emissions Generated at Intersections for a SI Car under Real World Urban Driving Conditions

Study of the emissions generated at intersections for a SI car under real world urban driving conditions

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Newcastle University E-Prints

Newcastle University E-Prints