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Measurements of Time-Resolved Mass Injection Rates for a Multi-Hole and an Outward Opening Piezo GDI Injector
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 14, 2015 by SAE International in United States
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Time-resolved mass injection rates of an outward opening piezo-actuated and a solenoid actuated multi-hole GDI injector were measured to investigate (1) the influence of both hardware and software settings and (2) the influence on the injection rates from a wide range of operational parameters and (3) discuss limitations and issues with this measurement technique. The varied operating parameters were fuel pressure, back-pressure, electrical pulse width, single/double injection and injection frequency. The varied hardware/software parameters were injector protrusion, upstream fuel pressure condition and the cut-off frequency of the software's low-pass filter. Signal quality was found to be dependent on both hardware and software settings, especially the cut-off frequency of the low-pass filter. Measurements with high signal quality were not possible for back-pressures lower than 0.5 MPa. For the smallest possible injections, the piezo-actuated injector was found to be superior since it can inject very small amounts of fuel very accurately with little fuel pressure dependency. For engine realistic back-pressures, the multi-hole injector was found to be back-pressure independent. The piezo injector however was found to be strongly influenced by the back-pressure. The dynamic range was found to be much higher for the piezo injector, and the non-linear flow area was much larger for the multi-hole injector. Both injectors were capable of double injections but the piezo can use shorter dwell times. Effects of upstream fuel pressure fluctuations, especially on the second injection of a double injection, must be carefully taken into account.
CitationDahlander, P., Iemmolo, D., and Tong, Y., "Measurements of Time-Resolved Mass Injection Rates for a Multi-Hole and an Outward Opening Piezo GDI Injector," SAE Technical Paper 2015-01-0929, 2015, https://doi.org/10.4271/2015-01-0929.
- Gandhi , A. , Meinhart , M. , and Ortiz , S. Summary of Flow Metering Options for Injector Characterization SAE Technical Paper 2009-01-0664 2009 10.4271/2009-01-0664
- Zeuch , W. Neue Verfahren Zur Messung des Einspritzgesetzes und der Einspritz-RegelmaBigkeit von Diesel-Einspritzpumpen MTZ Jahrg. 22 9 1961
- Bosch , W. The Fuel Rate Indicator: A New Measuring Instrument For Display of the Characteristics of Individual Injection SAE Technical Paper 660749 1966 10.4271/660749
- Bower , G. and Foster , D. A Comparison of the Bosch and Zuech Rate of Injection Meters SAE Technical Paper 910724 1991 10.4271/910724
- Arcoumanis , C. and Baniasad , M. Analysis of Consecutive Fuel Injection Rate Signals Obtained by the Zeuch and Bosch Methods SAE Technical Paper 930921 1993 10.4271/930921
- Gandhi , A. and Meinhart , M. Fuel Injector Flow Rate Analysis for the Duratec 35 EcoBoost Engine SAE Technical Paper 2009-01-1505 2009 10.4271/2009-01-1505
- Ikeda , T. , Ohmori , Y. , Takamura , A. , Sato , Y. et al. Measurement of the Rate of Multiple Fuel Injection with Diesel Fuel and DME SAE Technical Paper 2001-01-0527 2001 10.4271/2001-01-0527
- Costa , M. , Allocca , L. , Montanaro , A. , Sorge , U. et al. Multiple Injection in a Mixed Mode GDI Boosted Engine SAE Technical Paper 2010-01-1496 2010 10.4271/2010-01-1496
- Takamura , A. , Fukushima , S. , Omori , Y. , and Kamimoto , T. Development of a New Measurement Tool for Fuel Injection Rate in Diesel Engines SAE Technical Paper 890317 1989 10.4271/890317