Energy recovery

Torotrak has developed its full-toroidal traction drive technology for application as a variable drive in flywheel-based mechanical hybrid systems. Often referred to as kinetic energy recovery systems (KERS), such mechanical hybrid systems incorporate a CVT (Continuously Variable Transmission) with a compact, high-speed flywheel.

Torotrak does not provide complete end-to-end KERS technology, but by working in partnership with flywheel technology providers, we can realise a valuable combined technology and commercial opportunity.

A mechanical hybrid system recovers, stores and then returns energy that is otherwise lost during vehicle deceleration. As the vehicle slows, kinetic energy is recovered through the KERS CVT and stored in the flywheel. As the vehicle accelerates, energy is released from the flywheel, via the KERS CVT, back into the driveline. Controlling the kinetic energy transfer between the vehicle and the flywheel is not realistic with a stepped ratio transmission – but with Torotrak’s unique ‘torque controlled’ KERS CVT, this task is managed both efficiently and reliably.

KERS CVT, jointly developed by Torotrak and licensee Xtrac