Browse Publications Technical Papers 2016-01-0678
2016-04-05

Study on Fuel Economy Improvement by Low Pressure Water-Cooled EGR System on a Downsized Boosted Gasoline Engine 2016-01-0678

This research was concerned with the use of Exhaust Gas Recirculation (EGR) improving the fuel economy over a wide operating range in a downsized boosted gasoline engine. The experiments were performed in a 1.3-Litre turbocharged PFI gasoline engine, equipped with a Low Pressure (LP) water-cooled EGR system. The operating conditions varied from 1500rpm to 4000rpm and BMEP from 2bar to 17bar. Meanwhile, the engine’s typical operating points in NEDC cycle were tested separately. The compression ratio was also changed from 9.5 to 10.5 to pursue a higher thermal efficiency. A pre-compressor throttle was used in the experiment working together with the EGR loop to keep enough EGR rate over a large area of the engine speed and load map. The results indicated that, combined with a higher compression ratio, the LP-EGR could help to reduce the BSFC by 9∼12% at high-load region and 3∼5% at low-load region. The fuel consumption reduction mechanisms were mainly attributed to heat loss reduction and lower pumping losses at low-to-moderate loads. During the high loads, the combustion phasing improvement combined with reducing fuel enrichment played a significant role to optimize the fuel efficiency, and the knock suppression effect was apparent.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 18% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:
TECHNICAL PAPER

Combustion Analysis on a Variable Valve Actuation Spark Ignition Engine Operating With E22 and E100

2017-01-1069

View Details

JOURNAL ARTICLE

Fundamental Study of Waste Heat Recovery in the High Boosted 6-cylinder Heavy Duty Diesel Engine

2015-01-0326

View Details

TECHNICAL PAPER

Investigations of Atkinson Cycle Converted from Conventional Otto Cycle Gasoline Engine

2016-01-0680

View Details

X