Allison Transmission Holdings Inc. and Cummins Inc. announced that they have received certification from the California Air Resources Board (ARB) to sell the model year 2015 Allison H 40/50 EP™ hybrid propulsion system paired with the Cummins ISB6.7 and ISL9 diesel-electric hybrid engines for transit buses and coaches. “We are pleased to remain the first and only hybrid system manufacturer approved for the transit market in California,” said Deborah Gordon, executive director of hybrid programs for Allison Transmission.
The dual Executive Order (EO) issued by the ARB to both Allison and Cummins allows sales of the Allison H 40/50 EP with the Cummins ISB6.7 or ISL9 diesel-electric hybrid engine, and is valid for 2015 models. The ARB first provided approval in 2014, but the process requires the EO to be reviewed for renewal eligibility on a model year basis.
Allison’s H 40/50 EP hybrid propulsion system is used for both straight and articulated transit buses, and it has been shown to improve fuel economy up to 25% over similar diesel buses. Additionally, its regenerative braking capability can significantly extend the brake change interval by as much as 350%.
The Cummins ISB6.7 and ISL9 diesel-electric hybrid engines feature proven technology designed and developed in-house that is optimized to deliver the efficiency, durability and performance transit bus customers expect. The ISB6.7 diesel-electric hybrid engine is rated at 280 hp (209kW) while the ISL9 diesel-electric hybrid engine is rated at 330 hp (246kW) for the transit bus market.
Source: Allison Transmission