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Accessory Electrification in Class 8 Tractors
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 03, 2006 by SAE International in United States
Annotation ability available
Fuel costs to operate large trucks have risen substantially in the last few years and, based on petroleum supply/demand curves, that trend is expected to continue for the foreseeable future. Non-propulsion or parasitic loads in a large truck account for a significant percentage of overall engine load, leading to reductions in overall vehicle fuel economy. Electrification of parasitic loads offers a way of minimizing non-propulsion engine loads, using the full motive force of the engine for propulsion and maximizing vehicle fuel economy.
This paper covers the integration and testing of electrified accessories, powered by a fuel cell auxiliary power unit (APU) in a Class 8 tractor. It is a continuation of the efforts initially published in SAE paper 2005-01-0016. Electrified accessories include the engine cooling system, complete with electric water pump and radiator fans; the cabin air conditioning system, including compressor, remote condenser, and fan; and the vehicle compressed air supply system. A 20 kW fuel cell APU supplies 42 VDC power for all electrified accessories. A 34.5 MPa compressed hydrogen storage and supply system, with a capacity of five kg of hydrogen, supplies the APU. Product water from the fuel cell is collected and used as an evaporative-cooling assist for the engine charge air cooler and radiator, thereby minimizing cooling fan-on time. A 42/14 dual-voltage high-efficiency alternator is used to replace the OEM alternator, to provide an alternate source of 42 VDC in the event that the fuel cell is inoperative.
For each electrified accessory, a system description is provided detailing the physical configuration, subsystem design, control strategies, and a summary of energy savings. An overall summary of energy savings during an unloaded (bobtail) cross-country trip is provided.
This work was been performed at Southwest Research Institute and SunLine Transit Agency and is funded by the US Army National Automotive Center. The Class 8 tractor has been tested in service in the desert of southern California, where SunLine Transit Agency is located.
|Technical Paper||Electrification and Integration of Accessories on a Class-8 Tractor|
|Technical Paper||Electric Air Conditioning for Class 8 Tractors|
|Technical Paper||Fuel Economy Benefits of Electric and Hydraulic Off Engine Accessories|
CitationRedfield, J., Surampudi, B., Gustavo, R., Montemayor, A. et al., "Accessory Electrification in Class 8 Tractors," SAE Technical Paper 2006-01-0215, 2006, https://doi.org/10.4271/2006-01-0215.
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