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Evaluation of Emerging Technologies on a 1.6 L Turbocharged GDI Engine
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 03, 2018 by SAE International in United States
This content contains downloadable datasetsAnnotation ability available
Low-pressure loop exhaust gas recirculation (LP- EGR) combined with higher compression ratio, is a technology package that has been a focus of research to increase engine thermal efficiency of downsized, turbocharged gasoline direct injection (GDI) engines. Research shows that the addition of LP-EGR reduces the propensity to knock that is experienced at higher compression ratios . To investigate the interaction and compatibility between increased compression ratio and LP-EGR, a 1.6 L Turbocharged GDI engine was modified to run with LP-EGR at a higher compression ratio (12:1 versus 10.5:1) via a piston change. This paper presents the results of the baseline testing on an engine run with a prototype controller and initially tuned to mimic an original equipment manufacturer (OEM) baseline control strategy running on premium fuel (92.8 anti-knock index). This paper then presents test results after first adding LP-EGR to the baseline engine, and then also increasing the compression ratio (CR) using 12:1 pistons. As a last step, the 10.5 CR engine with LP-EGR was run on regular fuel (87.7 anti-knock index) to verify that this configuration could be calibrated to maintain performance like the baseline engine running on premium fuel. To understand the effect of each technology and operating strategy combination on vehicle fuel economy, the various engine maps were compared in EPA’s Advanced Light-Duty Powertrain and Hybrid Analysis (ALPHA) tool over U.S. regulatory drive cycles. This work was done in close collaboration with U.S. EPA engineers as part of their continuing assessment of advanced light-duty automotive technologies to support setting appropriate national greenhouse gas standards.
- Graham Conway - Southwest Research Institute
- Dennis Robertson - Southwest Research Institute
- Chris Chadwell - Southwest Research Institute
- Joseph McDonald - US Environmental Protection Agency
- John Kargul - US Environmental Protection Agency
- Daniel Barba - US Environmental Protection Agency
- Mark Stuhldreher - US Environmental Protection Agency
CitationConway, G., Robertson, D., Chadwell, C., McDonald, J. et al., "Evaluation of Emerging Technologies on a 1.6 L Turbocharged GDI Engine," SAE Technical Paper 2018-01-1423, 2018, https://doi.org/10.4271/2018-01-1423.
Data Sets - Support Documents
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