Allison Transmission unveils integrated stop-start technology

Allison Transmission Holdings Inc. has announced new integrated stop-start technology in conjunction with Project Ethos, an ultra-low carbon powertrain programme created by Cummins Inc. The programme is to demonstrate the potential of alternative fuels for carbon dioxide (CO2) reductions in medium-duty commercial vehicles.

Randall R. Kirk, vice president of product engineering for Allison Transmission mentioned that the company has utilised stop-start technology in its hybrid systems for many years and “have been pleased to work with long-time collaborator Cummins on this new powertrain concept."

In partnership with the California Energy Commission, Cummins developed an engine that uses E85 (a high-octane blend of ethanol and gasoline) as a fuel to reduce greenhouse gas (GHG) emissions significantly. The Cummins Ethos 2.8L engine is coupled with an Allison 2000 Series fully automatic transmission which utilizes integrated stop-start for further emissions reduction, as well as increased fuel economy.

The stop-start system shuts the engine down when the operator presses the brake pedal and the vehicle comes to a complete stop. The transmission remains in drive during this time and locks the output to help prevent vehicle rollback by using an electric pump. As the driver's foot is lifted from the brake, the system automatically starts the engine to allow acceleration.