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Analytical Comparison of 2 and 3 Way Digital Valves for Use on Direct Needle Control Fuel Injectors
Technical Paper
2004-01-0032
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
For years, diesel Common Rail Systems (CRS) have utilized 2-way valves and orifices for needle control in the injectors. Although this approach has been quite successful, challenges to improving injection performance still remain. The design of a reliable 3-way high pressure control valve is challenging, but its implementation for needle control could represent a natural path to further improvements in injection performance. The rational is that a 3-way valve would provide more independent control of needle opening and closing rates than the 2-way design. An efficient way of comparing 2-way and 3-way needle control methods is through a numerical simulation study. To that end, numerical simulation models of injectors with both needle control concepts were built. These numerical models were very detailed, and accounted for compressible line dynamics of the working fluids, cavitation in the working fluids, compression of the injector parts under pressure load, and bouncing of injector parts due to impacts. Detailed modeling of the electromagnetics and the electronic controls used to actuate the spool valves was also included. The platform for the injector models was the validated technology of hydraulic intensification and very rapid electromagnetic valve actuation applied to a unit diesel injector currently in production. Verification of the simulation models was achieved by comparing the results of simulation with actual measured data. The 2- and 3-way valve direct needle control concepts were then evaluated with simulation at specific fuel system application points for performance parameters such as small quantity control capability, close coupling of multiple events, and parasitic losses. The numerical results show that the 3-way needle control valve offers distinct advantages over a 2-way valve in certain areas of injection performance. Other factors important for fuel system selection, such as cost, manufacturability and injector-to-injector variability were considered, but are not presented in detail in this study.
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Citation
Kiss, T. and Wolverton, M., "Analytical Comparison of 2 and 3 Way Digital Valves for Use on Direct Needle Control Fuel Injectors," SAE Technical Paper 2004-01-0032, 2004, https://doi.org/10.4271/2004-01-0032.Also In
References
- Greeves, G Tullis, S. Barker, B “Advanced Two-Actuator EUI and Emission Reduction for Heavy-Duty Diesel Engines,” SAE Paper 2003-01-0698
- Zhang, L. “A Study of Pilot Injection in a DI Diesel Engine,” SAE paper 1999-01-3493 1999
- Cole, C. Sturman, O. E. Giordano, D. “Application of Digital Valve Technology to Diesel Fuel Injection,” SAE paper 1999-01-0196
- Vance, E Giordano, D. Sturman, O. E. “Feedback Control of a Digital Hydraulic Operating System (DHOS) Diesel Injector,” SAE Paper 2001-01-0525
- Bianchi, G. M. Pelloni, P Corcione, F. E. Luppino, F. “Numerical Analysis of Passenger Car HSDI Diesel Engines with the 2 nd Generation of Common Rail Injection Systems: The Effect of Multiple Injections on Emissions,” SAE Paper No. 2001-01-1068
- Bianchi, G.M. Falfari, S. Pelloni, P. Filicori, F. Milani, M. “A Numerical and Experimental Study Towards Possible Improvements of Common Rail Injectors,” SAE Paper 2002-01-0500
- Needham, J. R. Bouthenet, A. “Competitive Fuel Economy and Low Emissions Achieved Through Flexible Injection Control,” SAE Paper 931020 1993
- Reitz, R. D. Song-Charng, K. Bianchi, G. M. Falfari, S. Pelloni, P. “Numerical Analysis of High-Pressure Fast-Response Common Rail Injector Dynamics,” SAE Paper 2002-01-213
- Kolade, B. Boghosian, M. E. Reddy, P. S. Gallagher, S. “Development of a General Purpose Thermal-Hydraulic Software and Application to Fuel Injection Systems,” SAE Paper 2003-01-0702
- Wolverton, M. A. Giordano, D. Quinlan, M. Zukowski, R. “Evaluation of a 3-Way Direct Needle Control DHOS Unit Injector on Hydraulic Test Bench and V8 Engine,” SAE Paper 2004-01-0024
- Kohketsu, S. Tanabe, K. Mori, K. “Flexibly Controlled Injection Rate Shape with Next Generation Common Rail System for Heavy Duty DI Diesel Engines,” SAE Paper 2000-01-0705
- Russell, M. F. Greeves, G. Guerrassi, N. “More Torque, Less Emissions and Less Noise,” SAE Paper 2000-01-0942
- Glassey, S. F. Stockner, A. R. Flinn, M. A. “HEUI - A New Direction for Diesel Engine Fuel Systems,” SAE Paper 930270 1993
- Bosch W. “The Fuel Rate Indicator: A New Measuring Instrument For Display of the Characteristics of Individual Injection,” SAE Paper 660749 1966
- Erlach, H. Chmela, F. Cartellieri, W. Herzog, P. “Pressure Modulated Injection and Its Effect on Combustion and Emissions of a HD Diesel Engine,” SAE Paper 952059 1995
- Pierpont, D. A. Reitz, R. D. “Effects of Injection Pressure and Nozzle Geometry on DI Diesel Emissions and Performance,” SAE Paper 950604 1995
- Badami, M. Nuccio, P. Trucco, G. “Influence of Injection Pressure on the Performance of a DI Diesel Engine with a Common Rail Fuel Injection System,” SAE Paper 1999-01-0193 1999