This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Development of an Injector Deposit Formation Test Method for a Medium-Duty Diesel Engine
Technical Paper
2015-01-1914
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
In a modern diesel engine, a high fuel injection pressure is achieved by a common-rail system. Therefore, it is important to understand the effects of fuel properties on engine performances because a diesel fuel could deteriorate inside an injector at such severe conditions. The test methods so far basically use the fuel with pro-fouling agent to form deposit on injector. In this study, a novel test procedure was developed to evaluate the effect of the use of the fuel with and without zinc contaminant on injector performance. With Zn doped European specification B7 fuel (7% biodiesel) as a reference, the test result showed that an engine torque decreased almost lineally over time, and the overall torque drop was 9% after 300 hours. The investigation of the dismantled injector after the test revealed that the deposit was not formed on the sliding parts of the injector, but on the nozzle hole surface. The performance of a dismantled injector after the test was examined and it was concluded that the torque drop in the engine test was induced by formation of the nozzle deposits. Then, the effect of the use of a blended fuel conforming to the Japanese specification on injector deposit formation was also investigated with the same test procedure. This fuel was blended without Zinc to meet the JIS No. 2 specification. The overall engine torque drop rate in the injector deposit formation test was 5% after 300 hours. Thus, it was concluded that the test procedure is sufficient to generate some loss in the injector performance even with non-Zinc containing fuel, although to a lesser extent compared to the Zn doped B7 fuel. In addition, unlike Zn doped B7 fuel, some periods of recovery in engine torque were found during the test, this suggests the strength of a deposit adhesion on a nozzle surface was relatively weak.
Recommended Content
Authors
Topic
Citation
Kumagai, S., Takahashi, A., Nagato, H., and Stradling, R., "Development of an Injector Deposit Formation Test Method for a Medium-Duty Diesel Engine," SAE Technical Paper 2015-01-1914, 2015, https://doi.org/10.4271/2015-01-1914.Also In
References
- Co-ordinating European Council CEC F-98-08 Direct Injection Common Rail Diesel Engine Nozzle Coking Test http://www.cectests.org
- D'Ambrosio , S. , Ferrari , A. Diesel Injector Coking: Optical-Chemical Analysis on Deposits and Influence on Injected Flow-Rate, Fuel Spray and Engine Performance Journal of Engineering for Gas Turbines and Power 134 2012
- Tang , J. , Pischinger , S. , Lamping , M. , Körfer , T. et al. Coking Phenomena in Nozzle Orifices of Dl- Diesel Engines SAE Int. J. Fuels Lubr. 2 1 259 272 2009 10.4271/2009-01-0837
- Arpaia , A , Catania A., E. , D'Ambrosio , S. , Ferrari , A. , Luisi S. ,, Spessa P. , Lucerne E. Injector Coking Effects on Engine Performance and Emissions - Conference Paper ASME 2009
- Baker , J. , Cook , S. Sodium Contamination of Diesel Fuel, its Interaction with Fuel Additives and the Resultant Effects on Filter Plugging and Injector Fouling SAE 2013-01-2687 2013
- Reid , J. , Baker , J. Understanding Polyisobutylene Succinimides (PIBSI) and Internal Diesel Injector Deposits SAE 2013-01-2682 2013
- Ikemoto , M. , Omae , K. , Nakai , K. , Ueda , R. et al. Injection Nozzle Coking Mechanism in Common- rail Diesel Engine SAE Int. J. Fuels Lubr. 5 1 78 87 2012 10.4271/2011-01-1818
- Leedham , A. , Caprotti , R. , Graupner , O. , Klaua , T. Impact of Fuel Additives on Diesel Injector Deposits SAE 2004-01-2935 2004
- Tanaka , A. , Yamada , K. , Omori , T. , Bunne , S. et al. Inner Diesel Injector Deposit Formation Mechanism SAE Int. J. Fuels Lubr. 6 3 755 761 2013 10.4271/2013-01-2661