Browse Publications Technical Papers 2013-01-1605
2013-04-08

Use of Low-Pressure Direct-Injection for Reactivity Controlled Compression Ignition (RCCI) Light-Duty Engine Operation 2013-01-1605

Reactivity-controlled compression ignition (RCCI) has been shown to be capable of providing improved engine efficiencies coupled with the benefit of low emissions via in-cylinder fuel blending. Much of the previous body of work has studied the benefits of RCCI operation using high injection pressures (e.g., 500 bar or greater) with common rail injection (CRI) hardware. However, low-pressure fueling technology is capable of providing significant cost savings. Due to the broad market adoption of gasoline direct injection (GDI) fueling systems, a market-type prototype GDI injector was selected for this study. Single-cylinder light-duty engine experiments were undertaken to examine the performance and emissions characteristics of the RCCI combustion strategy with low-pressure GDI technology and compared against high injection pressure RCCI operation. Gasoline and diesel were used as the low-reactivity and high-reactivity fuels, respectively. GDI injection pressures range from 150 to 200 bar, while the CRI pressures range from 250 to 500 bar. Start of injection (SOI) timings ranged from -35° aTDC and -115° aTDC. The experimental results show comparable engine performance and emissions output, but with slight reductions in overall combustion efficiency when using low-pressure fueling with the stock re-entrant piston. CFD simulations were also performed to aid in visualization of the in-cylinder fuel distributions, which are controlling factors for RCCI combustion. By utilizing an optimized RCCI piston geometry, equivalent RCCI combustion performance can be achieved under low-pressure fueling, at moderate and high loads. The optimized geometry also allows for significant increases in thermal efficiency, with peak efficiencies over 47% observed.

SAE MOBILUS

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

Access SAE MOBILUS »

Members save up to 16% off list price.
Login to see discount.
We also recommend:
JOURNAL ARTICLE

Effect of Piston Bowl Geometry on Dual Fuel Reactivity Controlled Compression Ignition (RCCI) in a Light-Duty Engine Operated with Gasoline/Diesel and Methanol/Diesel

2013-01-0264

View Details

JOURNAL ARTICLE

Effects of Injection Pressure, Injection-Rate Shape, and Heat Release on Liquid Length

2012-01-0463

View Details

TECHNICAL PAPER

Production Feasible DME Technology for Direct Injection CI Engines

2001-01-2015

View Details

X