This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
GDi High Efficiency Fuel Pump for Fast Engine Starts and Reduced Cam Loads
Technical Paper
2019-01-1196
ISSN: 0148-7191, e-ISSN: 2688-3627
This content contains downloadable datasets
Annotation ability available
Sector:
Language:
English
Abstract
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.
Recommended Content
| Technical Paper | AUTOMOTIVE FUEL PUMPS - A Fundamental Study of Their Performance |
| Technical Paper | Load-Sensing Gear Pumps |
| Technical Paper | Hydraulic System of Case/International Model 1844 Cotton Picker |
Authors
Citation
Spakowski, 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
| Title | Description | Download |
|---|---|---|
| Unnamed Dataset 1 |
Also In
References
- Piock , W. , Befrui , B. , Berndorfer , A. , and Hoffmann , G. Fuel Pressure and Charge Motion Effects on GDi Engine Particulate Emissions SAE Int. J. Engines 8 2 464 473 2015 10.4271/2015-01-0746
- Hoffmann , G. , Befrui , B. , Berndorfer , A. , Piock , W. et al. Fuel System Pressure Increase for Enhanced Performance of GDi Multi-Hole Injection Systems 7 1 519 527 2014 10.4271/2014-01-1209
- 350 Bar GDi System: Under Pressure https://www.delphi.com/innovations/350-bar-gdi-system-low-particulate-emissions 2018
- Spicher , U. , Magar , M. , and Hadler , J. High Pressure Gasoline Direct Injection in Spark Ignition Engines - Efficiency Optimization through Detailed Process Analyses SAE Int. J. Engines 9 4 2120 2128 2016 10.4271/2016-01-2244
- Spegar , T. , Chang , S. , Das , S. , Norkin , E. et al. An Analytical and Experimental Study of a High Pressure Single Piston Pump for Gasoline Direct Injection (GDi) Engine Applications SAE Technical Paper 2009-01-1504 2009 10.4271/2009-01-1504
- Spakowski , J. , Spegar , T. , and Mancini , L. Development of a Low-Noise High Pressure Fuel Pump for GDi Engine Applications SAE Technical Paper 2013-01-0253 2013 10.4271/2013-01-0253
- 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