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Measurements of Time-Resolved Mass Injection Rates for a Multi-Hole and an Outward Opening Piezo GDI Injector

Petter Dahlander (Institutionen för tillämpad mekanik, Förbränning) ; Daniele Iemmolo ; Yifei Tong
SAE Technical Papers: SAE 2015 World Congress and Exhibition; Cobo CenterDetroit; United States; 21 April 2015 through 23 April 2015 (2015)
[Konferensbidrag, refereegranskat]

Time-resolved mass injection rates of an outward opening piezoactuated 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.

Nyckelord: GDI, Direct Injection, stratified, piezo, multi-hole, lean burn, injection rates, Zeuch method



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Denna post skapades 2015-05-21. Senast ändrad 2015-08-27.
CPL Pubid: 217337

 

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Institutioner (Chalmers)

Institutionen för tillämpad mekanik, Förbränning (2007-2017)

Ämnesområden

Transport
Strömningsmekanik

Chalmers infrastruktur