This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Can Fuel Preparation Affect Engine-Out Hydrocarbon Emissions during an FTP (75CVS) Cycle Test?
Technical Paper
2001-01-1312
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Event:
SAE 2001 World Congress
Language:
English
Abstract
The effect of fuel preparation on time-resolved, engine-out hydrocarbon (HC) emissions over a Federal Test Procedure cycle [FTP (75CVS)] for a ULEV vehicle equipped with a 6 cylinder engine has been investigated. Using a single-cone injector, the HC mole fraction in Bag 1 increased by a factor of 3-4 during each of the three accelerations in the first 100 sec after start. No such increases were observed in Bag 3 when the engine was fully warm. The increases during accelerations in Bag 1 were reduced by a factor of 3 when using a Dual-cone fuel injector as a drop-in substitute. The total, tailpipe FTP (75CVS) mass emissions were 25% smaller when using the Dual-cone injector. These results demonstrate that fuel preparation can affect HC emissions from a vehicle very significantly during cold start as has been deduced previously during cold-start tests using a dynamometer-controlled engine. In addition, the data suggest that steady-state tests using cold coolant and oil may not correctly represent true cold-start HC emissions.
Authors
Topic
Citation
Ireton, J. and Kaiser, E., "Can Fuel Preparation Affect Engine-Out Hydrocarbon Emissions during an FTP (75CVS) Cycle Test?," SAE Technical Paper 2001-01-1312, 2001, https://doi.org/10.4271/2001-01-1312.Also In
References
- Kaiser, E. W. Siegl, W. O. Lawson, G. P. Connolly, F. T. Cramer, C. F. Dobbins, K. L. Roth, P. W. Smokovitz, M. “Effect of Fuel Preparation on Cold Start Hydrocarbon Emissions from a Spark-Ignited Engine,” SAE Technical Paper No. 961957 1996