LPL EGR and D-EGR® Engine Concept Comparison Part 2: High Load Operation

Event
SAE 2015 World Congress & Exhibition
Authors Abstract
Content
The ongoing pursuit of improved engine efficiency and emissions is driving gasoline low-pressure loop EGR systems into production around the globe. The Dedicated EGR (D-EGR®) engine was developed to minimize some of the challenges of cooled EGR while maintaining its advantages. The D-EGR engine is a high efficiency, low emissions internal combustion engine for automotive and off-highway applications. The core of the engine development focused on a unique concept that combines the efficiency improvements associated with recirculated exhaust gas and the efficiency improvements associated with fuel reformation. To outline the differences of the new engine concept with a conventional LPL EGR setup, a turbocharged 2.0 L PFI engine was modified to operate in both modes. The second part of the cooled EGR engine concept comparison investigates efficiency, knock resistance, combustion stability, and maximum load potential at high load conditions. These results document the superior knock tolerance and stability of the D-EGR concept over the LPL EGR embodiment and how to overcome the combustion limitations that have historically limited SI engine efficiency at high EGR dilution levels. This study also demonstrates that the reformate is the source of the improved knock mitigation of a D-EGR concept by comparing the D-EGR results to a LPL EGR engine with and without supplemental H2 and CO at high loads.
Meta TagsDetails
DOI
https://doi.org/10.4271/2015-01-0781
Pages
10
Citation
Gukelberger, R., Gingrich, J., Alger, T., and Almaraz, S., "LPL EGR and D-EGR® Engine Concept Comparison Part 2: High Load Operation," Engines 8(2):547-556, 2015, https://doi.org/10.4271/2015-01-0781.
Additional Details
Publisher
Published
Apr 14, 2015
Product Code
2015-01-0781
Content Type
Journal Article
Language
English