CARB Approves Cummins-Allison 2019 Hybrid-Electric System
By Mike Osenga03 June 2019
Allison Transmission Holdings Inc. and Cummins Inc. said they have received certification from the California Air Resources Board (CARB) for model year 2019 Allison Hybrid 40/50 electric propulsion (H 40/50 EP) system paired with the Cummins B6.7 and L9 diesel-electric hybrid engines, used in transit buses and coaches.
Originally issued by the CARB in 2014, the dual executive order is required to be reviewed for renewed eligibility on a model year basis. The paired Allison electric hybrid-propulsion system and Cummins engine is used in both straight and articulated transit buses.
The Cummins B6.7 and L9 diesel-electric hybrid engines were developed in-house. The B6.7 diesel-electric hybrid engine is rated at 280 hp (209 kW) while the L9 diesel-electric hybrid engine is rated at 330 hp (246 kW) for the transit bus market.
Allison said the H 40/50 EP has been proven to improve fuel economy up to 25 percent. Additionally, its regenerative braking capability can significantly extend the brake change interval by as much as 350 percent.