Abstract
Using the Volkswagen emissions scandal as motivation, the purpose of this case study was to investigate whether or not heavy-duty diesel construction equipment exceeds EPA emissions standards for nonroad diesel engines. The equipment analyzed included four separate motor graders with EPA emissions standards Tier 0, Tier 1, Tier 2, and Tier 3 engines. The analysis was based on a dataset of real-world emissions rates collected from in-use equipment on actual jobsites. The results showed that mass per time emissions rates for hydrocarbons, carbon monoxide, nitrogen oxides, and particulate matter decreased as the EPA emissions standards became more stringent. Furthermore, there was only one observation in which the real-world average emissions rate exceeded the EPA emissions standard. Recommendations for improving the analysis include testing more equipment to improve the diversity of the study, focusing on mass per fuel consumed analyses that have less variability in emissions rates, and conducting more refined and controlled experiments in real-world conditions.
Recommended Citation
Karimi, Boshra and Lewis, Phil
(2021)
"Case Study of Real-World Emissions Rates verus EPA
Emission Standards for Motor Graders,"
The Professional Constructor: Vol. 46:
No.
1, Article 6.
Available at:
https://open.clemson.edu/aic-journal/vol46/iss1/6
