| Opacity and emission data were collected from heavy-duty diesel engines exercised through snap-acceleration tests and transient chassis dynamometer tests. Emission data were gathered using the West Virginia University (WVU) Transportable Heavy Duty Vehicle Emission Testing Laboratories (THDVETL) and opacity data were collected from two opacity meters; the Wager 650CP full flow opacity meter and the Bosch RT 100 partial flow opacimeter. Results showed that the Bosch peak opacity readings were consistently higher than the Wager peak opacity readings, and both meters showed little correlation with filter-captured particulate matter (PM). It was also observed that the snap-acceleration test did not identify PM due to engine load, which is a significant contributor to PM formation. The relation between opacity and carbon monoxide (CO) and PM and CO was also evaluated. A relation between continuous opacity and continuous CO was found. It was also observed that the CO/PM relation is engine and driving condition specific, and may be specific for engine loading, fuel, and environmental conditions as well. |
