Characteristics Study of Knocking, Fuel Consumption and Emissions with Cooled External EGR on SIDI Turbo Charged Gasoline Engine

Abstract:

Based on 2.0L spark ignition direct-injection(SIDI) turbo charged gasoline engine with variable valve timing(VVT), the spark timing effects on combustion process, fuel consumption, knock limitation and emissions were studied with external exhaust gas recirculation(EGR) on different loads and speeds. For the purpose of easily comparing data results, the location of 50% mass fraction burned(CA50) was widely used in this paper. The study results show that CA50 is changing linearly with spark timing. To reach the same combustion phase, spark timing need to be further advanced with external EGR. Combustion variability of IMEP(COV) increase sharply with retarding of CA50 with external EGR. The external EGR can greatly improve knock limitation and knock intensity(KI). To reach the best fuel consumption, CA50 need to be advanced to 6 °CA to 8 °CA for both with external EGR and without external EGR. NOx emissions increase with advancing of spark timing. HC show different trends when retarding spark timing with and without external EGR.

• Periodical: Applied Mechanics and Materials (Volumes 66-68)
• Pages: 102-107
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.66-68.102
• Online since: July 2011
• Authors: Ying Li Zu, Zheng Xin Zhou, Hong Yang Yu
• Keywords: CA50, COV, EGR, Knock Limitation, SIDI

References

[1] EBDI® - Application of a Fully Flexible High BMEP Downsized Spark Ignited Engine, Luke Cruff, Michele Kaiser and Steven Krause etc., SAE 2010-01-0587.

DOI: 10.4271/2010-01-0587

[2] Research and Development of a New Direct Injection Gasoline Engine, Makoto Koike and Akinori Saito etc., SAE 2000-01-0530.

[3] Thermodynamic Analysis and Benchmark of Various Gasoline Combustion Concepts, André Kulzer, Ansgar Christ and Martin Rauscher etc., SAE 2006-01-0231.

DOI: 10.4271/2006-01-0231

[4] Potential of Reducing the NOX Emissions in a Spray Guided DI Gasoline Engine by Stratified Exhaust Gas Recirculation (EGR), Fatih Sarikoc, Maurice Kettner and Amin Velji etc., SAE 2006-01-1261.

DOI: 10.4271/2006-01-1261

[5] Study on the Effect of EGR System on the Emissions from a Small Off-road Gasoline Engine, Jing Qin, Manqun Lin and Liang Zhao etc., SAE 2010-32-0040.

DOI: 10.4271/2010-32-0040

[6] Doing More with Less, - The Fuel Economy Benefits of Cooled EGR on a Direct Injected Spark Ignited Boosted Engine, Michele Kaiser and Uwe Krueger etc., SAE 2010-01-0589.

DOI: 10.4271/2010-01-0589

[7] Cooled EGR for a Turbo SI Engine to Reduce Knocking and Fuel Consumption, Sebastien Potteau, Philippe Lutz and Samuel Leroux etc., SAE 2007-01-3978.

DOI: 10.4271/2007-01-3978

[8] Exhaust Gas Recirculation for Improved Part and Full Load Fuel Economy in a Turbocharged Gasoline Engine, Alasdair Cairns, Hugh Blaxill and Graham Irlam etc., SAE 2006-01-0047.

DOI: 10.4271/2006-01-0047