Allison Transmission and Cummins will integrate and certify a Cummins B-Series engine with the Allison eGen Flex electric hybrid propulsion system for the transit market. The integration will meet the EPA’s Greenhouse Gas Emissions Standards for Heavy-Duty Vehicles – Phase 3 and provide a reliable low emission propulsion solution in 2027 and beyond.

eGen Flex offers transit agencies a flexible and efficient path to reducing emissions while maintaining high performance and reliability. This system is capable of operating up to 50% of a typical bus route in engine-off mode, providing a solution that is particularly beneficial in reducing emissions in urban areas.

eGen Flex

The system’s electric-only mode is activated through geofencing technology and eliminates engine emissions and noise while loading and unloading passengers and when operating in predefined dense pedestrian areas and zero-emission zones.

In August, Allison announced that Cummins has chosen Allison’s Vehicle Electrification + Environmental Test Center to conduct a series of tests on multiple trucks equipped with Cummins’ powertrains.

The 60,000-square-foot facility is the only one of its kind in the Midwest, designed to facilitate year-round testing in a controlled environment. The facility supports a wide range of vehicle testing, including those powered by diesel, gasoline, natural gas, hydrogen and battery electric systems. Its capabilities are essential for OEMs and suppliers who aim to reduce product development and validation timelines, ensuring that new technologies can be brought to market swiftly and efficiently.

The advanced testing facility’s controlled thermal environments and dynamometer road simulations can replicate a broad range of duty cycles, offering the ability to test vehicle performance under various extreme conditions. This not only enhances the reliability of results but also reduces costs compared to on-road testing.