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Real Time Control of GDI Fuel Injection during Ballistic Operation Mode
ISSN: 0148-7191, e-ISSN: 2688-3627
Published September 06, 2015 by SAE International in United States
Annotation ability available
Gasoline direct injection (GDI) combustion with un-throttled lean stratified operation allows to reduce engine toxic emissions and achieve significant benefits in terms of fuel consumption. However, use of gasoline stratified charges can lead to several problems, such as a high cycle-to-cycle variability and increased particle emissions. Use of multiple injection strategies allows to mitigate these problems, but it requires the injection of small fuel amounts forcing the traditional solenoid injectors to work in their “ballistic” region, where the correlation between coil energizing time and injected fuel amount becomes highly not linear.
In the present work a closed-loop control system able to manage the delivery of small quantities of fuel has been introduced. The control system is based on a particular feature found on the coil voltage command signal during the de-energizing phase. On the basis of this feature, the injector needle closing time and then, in turn, the actual amount of fuel injected can be calculated.
Results showed that the proposed control system, through a proper management of ballistic injections, has the potential to increase the minimum fuel injection capabilities of GDI solenoid injectors.
CitationTaglialatela Scafati, F., Pirozzi, F., Cannavacciuolo, S., Allocca, L. et al., "Real Time Control of GDI Fuel Injection during Ballistic Operation Mode," SAE Technical Paper 2015-24-2428, 2015, https://doi.org/10.4271/2015-24-2428.
- Schwarz , C. , Schünemann , E. , Durst , B. , Fischer , J. et al. Potentials of the Spray-Guided BMW DI Combustion System SAE Technical Paper 2006-01-1265 2006 10.4271/2006-01-1265
- King , J. , Schmidt , L. , Stokes , J. , Seabrook , J. , Nor , F. , Sahadan , S. Multiple injection and boosting benefits for improved fuel consumption on a Spray Guided Direct Injection gasoline engine Proceedings of the FISITA 2012 World Automotive Congress
- 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
- Wallace , I. Injection Rate Gauge: Pass Off Information and User Instructions Fuel & Engine Management Systems Graz December 2002
- Parotto , M. , Sgatti , S. , and Sensi , F. Advanced GDI Injector Control with Extended Dynamic Range SAE Technical Paper 2013-01-0258 2013 10.4271/2013-01-0258