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GDi High Efficiency Fuel Pump for Fast Engine Starts and Reduced Cam Loads
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 02, 2019 by SAE International in United States
This content contains downloadable datasetsAnnotation ability available
Gasoline direct injection (GDi) fuel pumps use a plunger reciprocating in a sleeve to deliver pressurized fuel. Current industry-standard clearances between the plunger and sleeve create internal fuel leakage rates which are large enough to negatively affect pumping efficiency at low engine speeds. A polymer seal located between the plunger and sleeve has been developed to minimize the fuel leak solving the low engine speed efficiency problem.
This paper will present analytical, experimental and validation testing results of improved pumping efficiency attained with this new seal. With the plunger seal, pumping efficiencies are shown to improve by a few percentage points at high engine rpms (erpm) but can double at low (cranking and idle) rpms, without degradation of performance after durability testing. Considering the rate of pressure rise during engine cranking, pumps with the plunger seal exhibit faster system pressure build which is independent of system pressure and cranking speed. Additional benefits of improved efficiency such as pump and cam downsizing will also be discussed where a decrease in maximum cam load and torque are predicted.
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CitationSpakowski, J., Kazour, J., Kaswer, B., Harstad, M. et al., "GDi High Efficiency Fuel Pump for Fast Engine Starts and Reduced Cam Loads," SAE Technical Paper 2019-01-1196, 2019, https://doi.org/10.4271/2019-01-1196.
Data Sets - Support Documents
|Unnamed Dataset 1|
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- Dupont Teflon® PTFE Fluoropolymer Resin Properties Handbook Wilmington, Dupont 1996 2
- Eichler , F. , Demmelbauer-Ebner , W. , Theobald , J. , Stiebels , B. , et al. The New EA211 TSI®Evo Engine from Volkswagen Presented at The 37th International Vienna Motor Symposium Austria April 28-29, 2016
- Spegar , T. Minimizing Gasoline Direct Injection (GDi) Fuel System Pressure Pulsations by Robust Fuel Rail Design SAE Technical Paper 2011-01-1225 2011 10.4271/2011-01-1225
- Husted , H. , Spegar , T. , and Spakowski , J. The Effects of GDi Fuel Pressure on Fuel Economy SAE Technical Paper 2014-01-1438 2014 10.4271/2014-01-1438