Variable Accessory Drives in Heavy Road Vehicles-Reduced Fuel Consumption and Improved Performance 933051
Normally, at high engine speeds the accessories consume unnecessary power. This can be counteracted by an accessory drive with variable speed ratio that reduces the speed of the accessories at high engine speeds.
Simulations of the fuel consumption and acceleration performance of heavy vehicles with a variable-ratio accessory drive have been carried out. A 7% reduction potential was found for the fuel consumption of a city bus with operating air conditioner. This potential was lower without air conditioner; about 3%. The acceleration performance was improved similarly. For buses at highway driving the results were similar. However, for trucks the corresponding potential was only about 1%.
Two variable-ratio accessory drives were studied. In general, a continuously variable design gave better results than a two-speed stepped device.
Citation: Hedman, A., "Variable Accessory Drives in Heavy Road Vehicles-Reduced Fuel Consumption and Improved Performance," SAE Technical Paper 933051, 1993, https://doi.org/10.4271/933051. Download Citation
Author(s):
Anders Hedman
Pages: 7
Event:
International Truck & Bus Meeting & Exposition
ISSN:
0148-7191
e-ISSN:
2688-3627
Also in:
SAE 1993 Transactions: Journal of Commercial Vehicles-V102-2
Related Topics:
Fuel consumption
Buses
Trucks
Vehicle acceleration
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