|
|
International Journal of Automotive Technology 2007;8(2): 149-154. |
| NUMERICAL ANALYSIS OF A SAMPLING MODULE FOR A FAST RESPONSE EXHAUST GAS ANALYZER |
| W. S. KIM1, J. H. LEE2, J. S. YOO2, B. O. RHEE2, J. I. PARK3 |
1Hyundai Motor Company
2Ajou University
3Ajou Univeristy |
|
|
|
|
|
| ABSTRACT |
|
The engine behavior in a transient condition is important to not only emission regulations but also fuel economy. A fast response gas analyzer can be a useful tool to investigate exhaust gas in a transient operation. It should be designed to analyze gas concentration with a short time constant by a fast sampling module and an appropriate measuring method for each emission element. In this study, a new fast sampling module is introduced and flow analysis is performed by numerical simulation. The analysis has shown the proper operating condition and the sensitivity of the module for practical application. Calculated flow to the sampling module has 0.5~4% error, while backflow toward the expansion tube is expected when pressure in CP (Constant Pressure) chamber is over 0.6 bar. For a stable supply of flow to the optical cell, sample gas pressure should be in the range, 0.35~1.90 bar, when the pressure in the CP camber and the optical cell are 0.2 bar and 0.158 bar, respectively. |
| Key Words:
Sampling module, Fast analyzing, Optical cell, Total response time |
|
|
|
Preview
Full text via DOI 
Download Citation 
Print 
