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Effects of an on line bypass oil recycler on emissions with oil age for a bus using in service testing

Andrews, G.E., Li, H., Hall, J., Rahman, A.A. and Mawson, P. (2001) Effects of an on line bypass oil recycler on emissions with oil age for a bus using in service testing. In: SAE Book SP-1641: Diesel Emission Control Systems. Society of Automotive Engineers , USA , pp. 180-203. ISBN 0-7680-0851-4

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Abstract

A method of cleaning lubricating oil on line was investigated using a fine bypass particulate filter followed by an infra red heater. Two bypass filter sizes of 6 and 1 micron were investigated, both filter sizes were effective but the one micron filter had the greatest benefit. This was tested on two nominally identical EURO 2 emissions compliance single decker buses, fitted with Cummins 6 cylinder 8.3 litre turbocharged intercooled engines and coded as Bus 4063 and 4070. These vehicles had emissions characteristics that were significantly different, in spite of their similar age and total mileage. Bus 4063 showed an apparent deterioration on emissions with time while Bus 4070 showed a stabilised trend on emissions with time for their baseline tests without the recycler fitted. Comparison was made with the emissions on the same vehicles and engines with and without the on-line bypass oil recycler. Engine exhaust emissions were measured about every 2000 miles. All tests started with an oil drain and fresh lubricating oil. The two buses were tested in a different sequence, Bus 4063 with the recycler fitted and then removed later in the test after an oil change and Bus 4070 with no recycler fitted at first and then fitted after 29,000 miles with no oil change. The Bus 4070 was also the one with the finer bypass filter. The test mileage was 45,000 miles for Bus 4063 and 48,000 miles for Bus 4070. The air/fuel ratio was worked out by the exhaust gas analysis. The correlation between air/fuel ratio and emission parameters was determined. The results showed that the on line oil recycler cleaning system reduced the rate of increase of the NOx from 5% to 1.6% for Bus 4063 and from 4.1% to 0% for Bus 4070 per 10,000 miles. Hydrocarbon emissions increased 30 ppm per 10,000 miles with the recycler removed compared to a stabilised level with the recycler fitted for Bus 4063. There was a small decrease in hydrocarbon emissions after fitting the recycler for Bus 4070. The particulate emissions were reduced by 35% for Bus 4063 and 24% for Bus 4070 on average. The reductions on total particulate mass were due to reductions on particulate carbon and lube oil VOF emissions. The black smoke was reduced by 56% for Bus 4063 in terms of rate of increase and 40% for Bus 4070 in terms of average values

Item Type: Book Section
Copyright, Publisher and Additional Information: © 2001 SAE International. Published on this website with permission from SAE International. As a user of this website, you are permitted to view this paper on-line, download the .pdf file and print one copy of this papers at no cost for your use only. The downloaded .pdf file and printout of this SAE papers may not be copied, distributed or forwarded to others or for the use of others.
Keywords: emissions, oil age, oil recycler, Bus testing
Institution: The University of Leeds
Academic Units: The University of Leeds > Faculty of Engineering (Leeds) > School of Process, Environmental and Materials Engineering (Leeds) > Energy and Resources Research Institute (Leeds)
Depositing User: Hu Li
Date Deposited: 12 Mar 2007
Last Modified: 06 Jun 2014 00:29
Published Version: http://www.sae.org/technical/papers/2001-01-3677
Status: Published
Publisher: Society of Automotive Engineers
Refereed: Yes
Identification Number: SAE Paper # 2001-01-3677
URI: http://eprints.whiterose.ac.uk/id/eprint/2048

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