Cummins unveils stop-start engine technology for conventional buses

Cummins unveiled a breakthrough for sustainable public transport on Monday, announcing that it has developed a stop-start technology for conventional buses that had previously only been available for diesel-electric hybrids.

“We have developed a system that delivers 4 to 7 percent fuel savings without significant operator investment needed and meets the durability requirements of city bus duty cycles,” Cummins Global Bus Engine Segment General Manager Kartik Ramanan said at Busworld Kontrijk, a European bus trade show. “A vehicle could stop every minute, so to meet the tough operational needs we have re-designed critical engine components and are validating them across 4 million stop starts.”

The stop-start system shuts the engine of when the bus isn’t moving, and Cummins’ version for conventional buses uses an upgraded starter motor that's good for 210,000 stop-start events.

“Results so far have been excellent,” Ramanan said. “Along with the 4 to 7 percent improvement in fuel economy and carbon dioxide  emissions, we are also seeing a 30 to 40 percent reduction in nitrous oxide emissions, supporting further improvements in clean air.”

The company plans to launch 100 of the buses in the fourth quarter of 2015, with a full production launch in March 2016.

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