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Characteristics of truck emission idling under real-world conditions.

Yu, Lei*,1, Qiao, Fengxiang1, Soltani, Vida1, 1 Texas Southern University, Houston, Texas, U.S.A.

ABSTRACT- Truck idling emission is a complicated phenomenon that must be considered independently of other mobile emissions. Various problems are associated with engine idling, including pollutant emissions, noise pollution, driver discomfort, and unnecessary fuel and maintenance costs. Recently, EPA and other organizations and institutions have examined idling for brief as well as long periods of time in diverse groups of heavy-duty trucks under various engine speeds, ambient temperatures, and accessory loads. Even so, the operation of engine idling after different driving conditions has not been fully examined. In this research, an attempt is made to measure actual idling emissions from truck tailpipes and to relate measured emissions to altered pre-testing driving conditions. The On-Board Emission Monitoring system (OEM-2100TM) is employed for testing. This equipment determines the concentration of HC, CO, CO2, O2, and NOx in the exhaust gas by a functional equivalent of a repair-grade dual five-gas analyzer subsystem. Altered driving circumstances considered during truck idling tests include cold starts and hot starts, different distances and durations of driving before the tests, different roadway facility types used while driving, different durations of idling tests, etc. Measured emissions under all the different pre-testing driving conditions are compared and necessary conclusions are made. In addition, measured idling emissions are compared with emissions estimated by the emission estimation model MOBILE6.2 for the particular testing truck.

Key words: Idling, Emission, OEM, MOBILE

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