Techniques for Improved Correlation Between Constant Volume and Partial Flow Sample Systems
2009-01-1351
04/20/2009
- Event
- Content
- A partial-flow sampling system, namely a Bag Mini-Diluter (BMD) is an accepted alternative to Constant Volume Sampling (CVS) for obtaining mass emissions in a chassis test cell. Our equipment delivers equivalent CVS and BMD emission results with gasoline engines of 2.0 to 5.6 liter displacement. However, while testing a vehicle with a 1.3 liter engine, CVS and BMD CO2 mass differences greater than 9% were observed during cold-start tests. This paper describes the modifications made to obtain BMD and CVS mass emissions that match within 2% during cold-start tests with a 1.3 liter vehicle.
- Pages
- 8
- Citation
- Nevius, T., Porter, S., Rauker, D., and Rooney, R., "Techniques for Improved Correlation Between Constant Volume and Partial Flow Sample Systems," SAE Technical Paper 2009-01-1351, 2009, https://doi.org/10.4271/2009-01-1351.