BorgWarner Inc. says it has developed a torque vectoring system for electric vehicles that requires only one electric motor rather than two.
The supplier plans to launch production of the system in 2022 for an unspecified carmaker.
Mounted to the rear axle, the electric motor uses a dual-clutch (inner and outer) device in place of a differential in the electric driveline. Each clutch is teamed with a reversible actuator to improve traction and steering response by transferring as much as 1,900 lb-ft of torque per clutch as needed to the left and right rear wheels.
Eliminating an electric motor reduces weight and costs in a torque vectoring system, BorgWarner notes. The design also enables greater packaging flexibility.
In all-wheel-drive vehicles that use a separate motor to power the front wheels, the rear unit can be automatically turned off when it isn’t needed. This minimizes energy losses and boosts driving range.
The Tesla Model 3 is certainly one of the most controversial cars to be launched in some time, with production models (a comparative handful, admittedly) presented on a stage with a throng of people treating it like it was an event with Beyoncé, Taylor Swift and Ed Sheeran, all at the same time.
Dan Nicholson is vice president of General Motors Global Propulsion Systems, the organization that had been “GM Powertrain” for 24 years.
Lithium-ion batteries have become the technology of choice for EVs, and falling costs and rising energy levels could keep them on top for nearly two decades.