Production Feasible Dme Technology for Direct-Injection Ci Engines

Document Number: 2001-01-2015

Date Published: May 2001

Author(s):
Denis Gill - AVL List GmbH
Herwig Ofner - AVL List GmbH
Eddie Sturman - Sturman Industries
John Carpenter - Sturman Industries
Marc Wolverton - Sturman Industries

Abstract:
DiMethyl Ether (DME) has been shown to be a very attractive fuel for low- emission direct-injection compression-ignition (DICI) engines. It combines the advantages of the high efficiencies of diesel cycle engines with soot free combustion. However, its greatest drawback is the need to develop new fuel injection and handling systems.

Previous approaches have been common-rail-type injection systems which have shown great potential in reducing harmful exhaust emissions and achieving good engine performance and efficiency due to good control of both the fuel injection characteristics and temperature. The concept also has proven benefits with respect to convenient and safe fuel handling. The logical evolution of this concept simplifies the fuel system and avoids special components for DME handling such as high pressure rail pumps while retaining all the benefits of the common rail principle.

This system uses hydraulically intensified fuel injectors driven by oil in a common-rail concept using digital valve technology. Such an approach shifts the high pressure to the oil which is more convenient in its handling than DME. Furthermore, amplifier pistons enable significantly higher injection pressures to be achieved while maintaining fuel pressures outside the injector at moderate levels.

File Size: 329K
Product Status: In Stock

See other papers presented at International Spring Fuels & Lubricants Meeting, May 2001, Orlando, FL, USA, Session: Alternative Fuels (Part A&B)

Purchase more technical papers and save! With TechSelect, you decide what SAE Technical Papers you need, when you need them, and how much you want to pay. Learn more >