Downspeeding a Light Duty Diesel Passenger Car with a Combined Supercharger and Turbocharger Boosting System to Improve Vehicle Drive Cycle Fuel Economy Eaton Corporation

Format:

Conference/Event

Author/Creator:

Wetzel, Wetzel, author.

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:

Downsizing and downspeeding have become accepted strategies toreduce fuel consumption and criteria pollutants for automotiveengines. Engine boosting is required to increase specific powerdensity in order to retain acceptable vehicle performance.Single-stage boosting has been sufficient for previousrequirements, but as customers and governments mandate lower fuelconsumption and reduced emissions, two-stage boosting will berequired for downsized and downsped engines in order to maintainperformance feel for common class B, C, and D vehicles.A 1.6L-I4 diesel engine model was created, and three differenttwo-stage boosting systems were explored through engine and vehiclelevel simulation to reflect the industry's current view of thelimit of downsizing without degrading combustion efficiency withcylinder volumes below 400 cm₃. Some current engines are already atthis size, so downspeeding will become much more important forreducing fuel consumption in the future. Twin-turbocharger,supercharger-turbocharger, and turbocharger-supercharger boostingsystems were explored using GT-Power and GT-Drive simulation todemonstrate each boosting system's impact on BSFC and drivecycle fuel economy over the NEDC and ARTEMIS (urban) cycle.Transmission shift points were altered to downspeed eachconfiguration to match equivalent vehicle performance whilemaintaining the same transmission and final drive ratios to notimpact vehicle creep speed and gradeability. The twin sequentialturbocharged engine had slightly lower full load BSFC values thanthe supercharged engines, but this slight penalty was easilyovercome through vehicle downspeeding by matching performance ofthe twin turbo vehicle. Vehicle fuel consumption for thesupercharger-based boosting systems was 8-10% lower over the NEDCand 12-14% lower over the ARTEMIS (urban) cycle when compared to atwin sequential turbocharger boosting system

Notes:

Vendor supplied data

Publisher Number:

2013-01-0932

Access Restriction:

Restricted for use by site license