Automakers are test-driving a new torque-vectoring electric drive system by GKN Automotive. The “eTwinster” technology is part of a range of new hybrid electric technologies GKN is showcasing to customers at its Wintertest proving ground in Arjeplog, Northern Sweden.
The eTwinster is a plug-in hybrid module that makes it simpler for vehicle platforms to offer electric all-wheel drive and torque vectoring. The driveline combines eAxle technologies proven in the Volvo XC90 T8 Twin Engine, Porsche 918 Spyder and BMW i8 plug-in hybrids and the twin-clutch torque vectoring technology that features in the Ford Focus RS and Range Rover Evoque.
|GKN eTwinster Torque vectoring eAxle. Click to enlarge.
Automakers’ vehicle dynamics experts are test-driving the technology in a premium SUV prototype. In the vehicle, a 60 kW, 240 N·m electric motor drives an electric axle with a transmission ratio of 1:10. A dual-clutch Twinster system then vectors the resulting 2,400 N·m of torque between the rear wheels, significantly improving dynamic response and handling.
GKN is the industry leader in eAxle technology with all our core eAxle and torque vectoring technologies now in production and proven expertise in integrating complete driveline systems. We have been building the momentum towards electric torque vectoring for some time. We believe our prototype torque-vectoring eAxle system represents the next step forward for the industry: a production-ready way to create higher performance hybrids that are more rewarding to drive.
The success of our eAxle systems in cars for Porsche, BMW and Volvo demonstrated how the right kind of hybridization creates new value propositions for the driver. Torque vectoring is the next step and we are excited to be demonstrating this technology during Wintertest.—Peter Moelgg, GKN Automotive President of Technology
By 2025, GKN forecasts that 40-50% of vehicles will have some level of electrification, with a greater proportion hybrids’ power delivered from the electric motor. The eTwinster could be programmed and integrated into a vehicle platform for production within the next three years.
The eTwinster is part of a range of new eDrive technologies that GKN is developing to help shift the balance of power from engines to batteries in the next decade. Current mass-production vehicle platforms can only draw around 30% of their energy from a battery. GKN expects small, powerful, torque-vectoring electric axles could deliver 60-70% of the power in future vehicles.