Comparison of Fuel Economy Improvement by High and Low Pressure EGR System on a Downsized Boosted Gasoline Engine

Paper #:
  • 2017-01-0682

Published:
  • 2017-03-28
Abstract:
In this paper comparisons were made between the fuel economy improvement by a High Pressure (HP) water-cooled Exhaust Gas Recirculation (EGR) system and that by a Low Pressure (LP) water-cooled EGR system. Experiments were implemented on a 1.3-Litre turbocharged PFI gasoline engine from 1500rpm to 3000rpm and BMEP from 2bar to 14bar because of the relative narrow available range of HP-EGR system. In consideration of practical application of EGR system, the coolant used in this experiment was kept almost the same temperature as in real vehicles (88±3℃) instead of underground water temperature. The results indicated that, HP-EGR usually got higher best EGR rates for fuel economy at low-load region, and a better improvement (up to 2.96%) of fuel economy was expected. In contrast at moderate-to-high loads, especially at low speed high load region, HP-EGR rates were severely constrained by the application of turbo. So the application range of HP-EGR and LP-EGR was also compared in this paper. Thus at these regions worse fuel economy improvements compared with LP-EGR were observed. Furthermore, cylinder-to-cylinder variations of combustion parameters of HP-EGR, for example ignition delay, combustion duration and IMEP, were wider than those of LP-EGR mainly for the non-uniform mixture of fresh working fluid and exhaust gas.
Access
Now
SAE MOBILUS Subscriber? You may already have access.
Buy
Attention: This item is not yet published. Pre-Order to be notified, via email, when it becomes available.
Select
Price
List
Download
$22.00
Mail
$22.00
Members save up to 36% off list price.
Share
HTML for Linking to Page
Page URL

Related Items

Technical Paper / Journal Article
2003-10-27
Technical Paper / Journal Article
2003-10-27
Training / Education
2017-06-06
Article
2016-02-02
Training / Education
2017-05-15
Technical Paper / Journal Article
2003-10-27
Article
2016-02-02