Downsizing Potential of Methanol Fueled DISIEngine with Variable Valve Timing and Boost Control Ghent University

Format:

Conference/Event

Author/Creator:

Nguyen, Nguyen, author.

Contributor:

Coulier, Jakob

Pillu, Thomas

Van Craeynest, Tim

Verhelst, Sebastian

Conference Name:

WCX World Congress Experience (2018-04-10 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2018

Summary:

AbstractMethanol is gaining traction in some regions, e.g. for road transportation in China and for marine transportation in Europe. In this research, the possibility for achieving higher power output and higher efficiency with methanol, compared to gasoline, is investigated and the influence of several engine settings, such as valve timing and intake boost control, is studied. At wide open throttle (WOT), engine speed of 1650rpm, the brake mean effective pressure (BMEP) of the methanol-fueled engine is higher than on gasoline, by around 1.8bar. The maximum BMEP is further increased when positive valve overlap and higher intake boost pressure are applied. Thanks to a lower residual gas fraction, and a richer in-cylinder mixture with positive valve overlap period, the engine BMEP improves by a further 2.6bar. Because of higher volumetric efficiency with a boosted intake air, the engine BMEP enhances with 4.7bar. The maximum BMEP for gasoline was found through a test matrix using the design of experiment approach. At that BMEP (16.3bar), the efficiency when fueling the engine with methanol improves by 22.7% relatively with valve overlap control and by 25.75% with intake boost control. The BMEP of the methanol engine can increase to a higher value without knock when a higher boost pressure or a longer valve overlap duration is employed. Limitations are no longer engine knock, but excessive peak in-cylinder pressures, however, being over 100bar. If the maximum pressure is limited to 100bar, the downsizing potential with boost control is higher than with variable valve timing. The engine could be further downsized by ~10.7% with methanol by boosting the intake pressure

Notes:

Vendor supplied data

Publisher Number:

2018-01-0918

Access Restriction:

Restricted for use by site license