Performance hybrid drivetrain integrates electromechanical torque vectoring

Electrification in high-performance vehicles is increasingly being combined with drivetrain control technologies to improve traction and handling. In this context, Audi introduced a new plug-in hybrid drivetrain architecture in the RS 5 featuring electromechanical torque vectoring through its quattro with Dynamic Torque Control system.

Rear-axle architecture designed for active torque distribution
The system is based on a newly developed rear transaxle integrating a 400-V water-cooled permanent-magnet electric motor acting as a high-voltage actuator. The actuator delivers 8 kW and 40 Nm and operates with overdrive gears and a conventional differential to actively distribute torque between the rear wheels.

This configuration enables targeted torque transfer between the left and right driveshafts within approximately 15 milliseconds. The system can generate torque differences of up to 2,000 Nm between the rear wheels to improve stability and traction during dynamic driving situations.

Unlike conventional mechanical torque vectoring systems, the electromechanical configuration can operate independently of drivetrain load conditions, allowing torque distribution during acceleration, coasting and braking.

Interaction between hybrid drivetrain and vehicle dynamics control
The torque vectoring system is designed to support vehicle dynamics in cornering situations by directing torque to the wheel with the highest available traction. During oversteer conditions, torque can be increased at the inner wheel to stabilize the vehicle, while understeer can be counteracted by redirecting torque toward the outer wheel.

The system works in coordination with other vehicle dynamics technologies including the electronic differential lock, brake torque vectoring functions and adaptive twin-valve dampers. Together, these systems form part of an integrated vehicle dynamics control architecture.

Centralized computing platform for drivetrain coordination
Vehicle behaviour is coordinated through the HCP1 (High-Performance Computing Platform), which acts as the central control unit for drivetrain and chassis systems. The system processes vehicle state data alongside environmental inputs and driver commands such as steering inputs.

By analysing steering behaviour and vehicle motion data, the control platform adjusts torque distribution strategies to support predictable handling behaviour and stability during dynamic manoeuvres.

Integration into performance-oriented hybrid vehicle platforms
The modular plug-in hybrid architecture combines electrified propulsion with drivetrain control technologies intended to improve both performance and efficiency. The system is designed to improve energy utilisation by directing available torque more effectively to the road surface while reducing traction losses.

The RS 5 integrates this drivetrain concept as part of Audi’s broader electrification strategy, where hybrid performance platforms are used to combine vehicle dynamics improvements with energy efficiency objectives in performance vehicle development.

Edited by industrial journalist Aishwarya Mambet, with AI-assistance.

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