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Advanced In-Line Pump for Medium-Duty Diesel Engines to Meet Future Emissions Regulations
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English
Abstract
This paper describes the Nippondenso in-line pump system designed for U.S. 1991 emissions regulation for medium duty diesel engines. With the combined use of the further improved in-line pump, NB-S and the multi-hole nozzle with a smaller orifice diameter, the required injection pressure of 100 MPa to 120 MPa at the nozzle can be achieved. However, some problems to be resolved exist in the subject fuel injection system: (1) secondary injection, (2) cavitation erosion of injection pipe, (3) higher pressure sealing of fuel, (4) undesirable fuel delivery curve vs. pump speed (called “Trumpet Shape” fuel delivery curve)
Thus technical measures to cope with those problems are explained in details.
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Citation
Itoh, S., Sasaki, S., and Arai, K., "Advanced In-Line Pump for Medium-Duty Diesel Engines to Meet Future Emissions Regulations," SAE Technical Paper 910182, 1991, https://doi.org/10.4271/910182.Also In
References
- Nishimura Masataka et al. “The Nippondenso In-line Pumps with Electric Control for the Clean Diesel Engine” SAE 870436
- Watanabe H. Yamada M. Imai K. Ishii Y. Sasaki S. “Cavitation in the Fuel Injection System of Diesel Engines” Proceedings of International Symposium on Cavitation April 1986 Sendai, Japan 269 274
- Suzuki Keizo et al. “Study of Abnormal Fuel Delivery Characteristics in High pressure Injection System” SAE 821073
- Itoh Shohei et al. “Simulation Analysis on Dynamic Characteristics of Diesel Fuel Injection Systems” SAE 851586