United States Department of Transportation
i
Bus Efficiency Grant: Hybrid Beltless Alternator Retrofit Program, Final Report
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2019-10-01
[PDF-1.32 MB]
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Abstract:This report presents the results of an analysis aimed at determining the cost-savings resulting from the installation of a “Hybrid-Beltless Alternator” (HBA) system. The HBA system was installed on 41 Maryland Transit Administration (MTA) buses to reduce alternator maintenance cost and activities, belt-related failures, alternator-related road calls, fuel consumption, and greenhouse gas emissions. Fuel consumption, part-replacement cost, and alternator-related road-call data were obtained from FleetWatch™ and Maximo™; the database management systems used by MTA for bus-related data collection, manipulation, and storage. The results, obtained from analyzing the data gathered, showed that the installation of the HBA on the 41 buses reduced fuel consumption by 6%, reduced CO2 emission by about 461,000 pounds, and increased the mean distance between alternator-related failure by over 5000 miles. This cost saving was considerably less than the cost saving recorded for the pilot bus (15–20%), possibly due to the variation in route, average speed on route, extended idling due to traffic breakdown, component failure, and maintenance routine between the pilot bus and the 41 retrofitted buses. In addition, the cost saving obtainable from HBA system installation was found to be directly proportional to usage—the higher the miles covered after retrofitting, the higher the cost savings observed.
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