Studies of Emissions from Gasoline-Powered Vehicles Above 6,000-lb. Gross Vehicle Weight.

摘要

Continued studies of heavy-duty gasoline-powered vehicle emissions (above 6,000-lb GVW),sponsored by the National Air Pollution Control Administration,Department of Health,Education,and Welfare,are described. Featured in this report are comparisons of road route hydrocarbon,carbon monoxide,and nitric oxide emissions to chassis dynamometer for six trucks of various sizes and makes. Using a constant volume sampler with results expressed in grams per pound of fuel,the current Federal cycle was subjected to a number of modifications to investigate their effect on the road--9mode cycle relationship. Limited studies with two trucks included comparison of 9-mode cycle results with the engine chassis and stationary operated. Also explored were the potentialities of operating an engine at its peak torque rpm at a variety of power modes. Continued study of alternative dynamometer procedures,sampling,analysis,and methods of expressing gasoline truck emissions is recommended.