Transient Drive Cycle Modeling of Supercharged Powertrains for Medium and Heavy Duty On-Highway Diesel Applications FEV Incorporated

Format:

Conference/Event

Author/Creator:

Birckett, Birckett, author.

Contributor:

Bevan, Karen

Biller, Brandon

Bowyer, Stephen

Keidel, Sean

Tomazic, Dean

Wetzel, Philip

Conference Name:

SAE 2012 Commercial Vehicle Engineering Congress (2012-10-02 : Rosemont, Illinois, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2012

Summary:

The problem with traditional drive cycle fuel economy analysisis that kinematic (backward looking) models do not account fortransient differences in charge air handling systems. Therefore,dynamic (forward looking) 1D performance simulation models werecreated to predict drive cycle fuel economy which encompass all thetransient elements of fully detailed engine and vehicle models. Thetransient-capable technology of primary interest was mechanicalsupercharging which has the benefit of improved boost response and"time to torque." The benefits of a supercharger clutchhave also been evaluated.The current US class 6-8 commercial vehicle market exclusivelyuses turbocharged diesel engines. Three vehicles and baselinepowertrains were selected based on a high-level review of vehiclesales and the used truck marketplace. Fuel economy over drivecycles was the principal output of the simulation work. Allpowertrains are based on EPA 2010 emission regulations. Twomethodologies for NOx reduction were also included: highpercentage EGR only (for in-cylinder NOx reduction) andlow percentage EGR + SCR aftertreatment catalyst. - Class 6Delivery truck, mid-6L displacement, FTP72 drive cycle, - Class 8Vocational truck, 13L engine, HD-UDDS drive cycle, and Class 8 Linehaul, 15L engine, HHDDT Cruise drive cycle.Two new modeling methodologies using GT-Suite were developed inthe process. Detailed dynamic models are more CPU intensive butprovided output that cannot be accounted for with faster runningsteady state or kinematic models. The improved boost response ofsupercharged configurations exhibited improved vehicle performancewithout increasing the rated power/torque levels. Various levels ofdownspeeding are applied which allow either improved performance orimproved fuel economy, or both, compared to the baselineturbocharged powertrain. Supercharger sizing, superchargerplacement (pre- or post-compressor in a series-boostedconfiguration), and EGR loop configuration were also evaluated. Afuel economy improvement has been realized in all three vehicleapplications

Notes:

Vendor supplied data

Publisher Number:

2012-01-1962

Access Restriction:

Restricted for use by site license