Predictive GT-Power Simulation for VNT matching on a 1.6 L GDI Turbo Engine

Paper #:
  • 2018-01-0161

Published:
  • 2018-04-03
Abstract:
The thermal efficiency benefits of low-pressure loop (LPL) EGR on spark-ignition engine combustion are well known. One of the greatest barriers facing adoption of LPL-EGR, on high power-density applications, is the challenge of boosting. Variable nozzle turbines (VNT) have recently been developed for gasoline applications operating at high exhaust gas temperatures (EGT). The use of a single VNT as a boost device was preferred to two-stage boosting system or a 48 V electronic boost device for this study. A predictive model was created based on engine testing results from a 1.6 L turbocharged GDI engine [1]. The model was tuned so that it predicted burn-rates and end-gas knock over an engine operating map with varying speed, load, EGR rate and fuel type. Using the model, an assessment of VNT performance was performed using compressor and turbine maps made available from a hardware supplier.Results show that the single VNT device is able to support LPL-EGR across the operating map while maintaining realistic engine full-load performance, while maintaining or improving upon thermal efficiency compared to a twin-scroll turbo charger. This work was done in close collaboration with U.S. Environmental Protection Agency engineers as part of their continuing assessment of advanced light-duty automotive technologies to support setting appropriate national greenhouse gas standards.
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
2011-05-17
Article
2017-07-26
Training / Education
2009-12-15
Event
2018-04-10