Split ratio control in mini-dilution tunnels for measurement of steady-state and transient emissions from heavy duty diesel engines Online publication date: Tue, 18-Jun-2013
by Mridul Gautam, Robert C. Smith
International Journal of Heavy Vehicle Systems (IJHVS), Vol. 5, No. 3/4, 1998
Abstract: A 91-tube multi-tube-type mini-dilution tunnel with and without a split ratio control unit was used to study the emissions from a heavy duty diesel engine, operated over several steady-state modes and transient test cycles. The split ratio, or the gas induction ratio, relates the volume of sampled raw exhaust to the total volume of engine exhaust that is generated. Determination of the split ratio and the ability to maintain this ratio around a certain theoretical value, 1/91 in the study, was critical to the entire sampling process. Results presented herein, demonstrate the ability of the split ratio control unit to improve dramatically the splitting accuracy of the 91-tube splitter, over both steady-state and transient cycles. Even when operated over severe changes in engine conditions of the transient cycles, the split ratio control unit was able to maintain an average pressure differential of nearly zero. However, the transient response of the PID controller needs further improvements.
Existing subscribers:
Go to Inderscience Online Journals to access the Full Text of this article.
If you are not a subscriber and you just want to read the full contents of this article, buy online access here.Complimentary Subscribers, Editors or Members of the Editorial Board of the International Journal of Heavy Vehicle Systems (IJHVS):
Login with your Inderscience username and password:
Want to subscribe?
A subscription gives you complete access to all articles in the current issue, as well as to all articles in the previous three years (where applicable). See our Orders page to subscribe.
If you still need assistance, please email subs@inderscience.com
Our Blog 
Follow us on Twitter 
Visit us on Facebook