Browse Publications Technical Papers 700105
1970-02-01

Evaluation of Vehicle Exhaust Gas Odor Intensity Using Natural Dilution 700105

Although exhaust gas odorants are generally a product of engine and fuel parameters, it is the vehicle that the public associates with exhaust odor. The vehicle and its movements have a large influence on the dispersion of exhaust odorants and, therefore, on the actual public exposure to exhaust odor. A considerable amount of public exposure to vehicle exhaust odor results from municipal operation of diesel-powered buses, especially during the bus-stop sequence. Panel test procedures were developed for field evaluation of full-scale vehicle exhaust odor intensity during the idle and acceleration portions of a simulated bus-stop sequence.
Odor tests, based on natural dilution of the vehicle exhaust to the odor threshold, were conducted in a controlled environment, indoors in large buildings. Different degrees of exhaust dilution were achieved by randomly varying the distance from the test vehicle to the panelists. Panelists were required to make yes-or-no decisions on whether or not they could detect an odor above the background level.
Exhaust odor intensity was expressed in terms of the threshold response distance, with greater threshold response distances indicating greater exhaust odor intensity. The test procedures gave adequate repeatability. Six repeat idle tests with one bus gave threshold response distances ranging from 27 - 32 ft, averaging 29 ft. Four repeat acceleration tests with another bus gave threshold response distances ranging from 32 - 41 ft, averaging 36 ft.
Idle tests with two different buses in two different test facilities showed repeatable differences in the exhaust odor intensity, indicating that the procedure was capable of discriminating between two odor sources of differing intensity.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Preview Document Add to Cart
Members save up to 16% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:
TECHNICAL PAPER

Progress in Diesel Odor Research

740213

View Details

TECHNICAL PAPER

Influence of Aldehyde and Hydrocarbon Components in the Exhaust on Exhaust Odor in DI Diesel Engines

2000-01-2820

View Details

TECHNICAL PAPER

Air to Air Turbocharged Air Cooling Versus Air-to-Water Turbocharged Air Cooling

840351

View Details

X