Challenge Determining a Combustion System Concept for Downsized SI-engines - Comparison and Evaluation of Several Options for a Boosted 2-cylinder SI-engine Robert Bosch GmbH

Format:

Conference/Event

Author/Creator:

Eichhorn, Eichhorn, author.

Contributor:

Hettinger, Alexander

Kufferath, Andreas

Lejsek, David

Conference Name:

SAE 2013 World Congress & Exhibition (2013-04-16 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2013

Summary:

To meet future CO₂ emissions limits and satisfy the bounds setby exhaust gas legislation reducing the engine displacement whilemaintaining the power output ("Downsizing") becomes ofmore and more importance in the SI engine development process. Thetotal number of cylinders per engine has to be reduced to keep thethermodynamic disadvantages of a small combustion chamber layout assmall as possible. Doing so new challenges arise concerning themechanical design, the design of the combustion system concept aswell as strategies maintaining a satisfying transient torquebehavior. To address these challenges a turbocharged 2-cylinder SIengine was designed for research purposes by Weber Motor GmbH andRobert Bosch GmbH. The design process was described in detail inlast year's paper SAE 2012-01-0832.Since the engine design is very modular it allows for severaldifferent engine layouts which can be examined and evaluated. Thispaper shows a comparison between three major combustion systemconcepts: - Gasoline Direct Injection, - Advanced GasolinePort-fuel Injection, and - Compressed Natural Gas Port-fuelInjection.As a first step the engine behavior was examined using differentturbochargers on the test bed to find the best match for a2-cylinder engine application, especially with respect to low-endtorque and transient behavior. Subsequently the 2-cylinder enginewas equipped with three different combustion system concepts andtested on the engine test bed using the standard measurementequipment including high and low pressure indication. The conceptswill be evaluated on the basis of their low-end torque andtransient performance. Therefore a measurement method and a keyperformance index were defined. Additionally the influence of thecombustion system concept choice on fuel consumption and CO₂emissions will be evaluated using drive cycle simulations. For eachconcept the advantages and challenges will be highlighted anddiscussed

Notes:

Vendor supplied data

Publisher Number:

2013-01-1730

Access Restriction:

Restricted for use by site license