UQM AND EATON DEVELOP TWOSPEED ELECTRIC DRIVETRAIN
Also involved in this project is automotive software developer Pi Innovo, specialised in engine and chassis management software. UQM Technologies has begun a development and production program with Eaton’s Vehicle Group that calls for Eaton to develop and supply to UQM a twospeed transmission for an EV application; Pi Innovo will develop and supply to UQM the transmission control unit. Together, the components will be combined with UQM’s current PowerPhase HD220/HD250 motor and inverter system to create a full electric drivetrain system called the “UQM PowerPhaseDT.”
The system will allow customers in the medium- and heavy-duty EV commercial markets to achieve increased performance in areas of grade ability, acceleration and efficiency. UQM will have prototypes ready for customers by early fall and start-of-production units ready by early 2017.
The Eaton twospeed transmission provides a greater speed and torque range from what would normally be possible in a direct drive system, allowing a smaller electric motor to drive large vehicles. The drivetrain allows for better packaging, efficiency, greater payload capacity and lower cost when compared with direct drive or single speed drivetrain strategies.
Perhaps the biggest benefit is the fact that the twospeed transmission keeps the electric motor operating in the highest efficiency region for a greater portion of the drive cycle. This, coupled with the extremely high efficiency of the “UQM PowerPhaseDT” electric drivetrain system, will enable the highest overall vehicle efficiency, saving cost in batteries and increasing range, UQM claims.
The development and production of a full electric drivetrain system will support the overarching need for full transmission systems as enhanced performance and efficiency requirements are mandated by customer drive cycle needs as well as the need to reduce battery costs and meet more stringent environmental regulations.