Slashes 40-Foot Bus Idle Time and Reduces Fuel Use
BAE Systems and Cummins are promoting a new start-stop feature for 40-foot transit buses equipped with the Cummins ISB6.7 diesel engine and BAE’s HybriDrive brand Series-E drivetrain. The optional feature, said to be a first for North America, has been shown to reduce idle time by 30% to 40%, while paring fuel use from 5% to 8%.
“We’re increasing the electrification of the vehicle,” says BAE’s Tom Webb, business development director for HybriDrive. The vehicle’s 11.6-kilowatt-hour lithium ion battery pack remains the same, but the buses are fitted with an auxiliary power system for maintaining hotel loads when the engine is off, with new software for communication with the Cummins engine.
The start-stop option includes “depot mode” so that buses may be moved around inside of transit facilities with zero emissions, hence the APS powers the bus’s electric power steering as well. Webb told F&F that the feature is only available on new buses, as older ones have mechanical gear that depends on direct engine power.
‘Unique in the Industry’
“Fuel economy and passenger experience benefits are unique in the industry,” BAE HybriDrive VP and general manager Steve Trichka says in the BAE-Cummins announcement. “We can now provide even more value to our North American hybrid customers,” he said.
“We are seeing significant fuel economy benefits with the two pilot buses programmed with the new stop/start function,” Dave Kilmer, executive director of Red Rose Transit and the Berks Area Regional Transit Authority in Pennsylvania says in the announcement. “In addition, our customers and drivers have told us these hybrid buses with stop/start are much quieter.”
Metro Minneapolis in Minnesota has also tested the system – which is also known as anti-idle mode – and it “is slated for delivery to other customers later this year.
Gillig, New Flyer, Nova Bus
“Testing has shown that the stop/start mode reduces engine idling time by up to 40%, which helps increase fuel economy and create a quieter atmosphere for passengers at bus stops,” says the release. “Accessories such as air conditioning, power steering, and air compressors remain operational during engine shut-off mode.”
The start-stop option is being offered by OEMs including Gillig, New Flyer, and Nova Bus.
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Source: BAE and Cummins with Fleets & Fuels follow-up