Steering-in-the-Loop sideview

The Steering-in-the-Loop test system enables to test real steering systems in closed-loop as well as open-loop maneuvers. For precise and reproducible steering angle inputs, a highly dynamic steering robot is available. Additionally, you can instantly experience and feel the steering performance with the Driver-in-the-Loop extension.

The dynamic forces on the tie rods are applied by precise linear actuators, which correspond to the current driving situation from simulation or measurement.


  • Electric steering column mount adjustment
  • Steering robot for angle and torque inputs
  • Optional Driver-in-the-Loop extension for real steering input from a test driver
  • Vertically adjustable tie rod angles (static)
  • Easy and precise orientation of steering wheel and steering robot
  • Multi-domain HIL extension in combination with suspension and ADAS ECUs in real time
  • Precise measurement of positions, forces and torque on the steering wheel and tie rods
  • Detection of power consumption of device under test
Steering-in-the-Loop front


  • Test of automated driving functions with easy integration of electrical steering system components
  • Optimization of control units with function, performance and variance tests
  • Implementing homologation tests
  • Tests and steering functions in the fields of vehicle dynamics and ADAS
  • Investigation of all-wheel/rear-wheel steering
  • Steer-by-Wire applications
  • Perform any driving scenarios in CarMaker
  • Extensive system optimization for active systems e.g. MBS suspension model, tires and vehicle

Your benefits at a glance

Short latencies of actuators and sensors

hardware, software as well as operation and adjustment of test bench from a single source



Available TestRuns improve usability

Significant test results

Optimized measurement for highest precision


Fast and precise control

Use of servo and linear motors for highest dynamics and exact control

Extensive test automation

Apply complete test catalogs (ISO steering maneuvers, Euro NCAP, customer-specific tests)


EtherCAT communication

Technical data

  • Peak force (each): 20 KN
  • Mean force (each): 12 KN
  • Active width of actuator: - 200 mm
  • Maximum velocity: +- 1m/s

  • Peak torque: 120  Nm
  • Mean torque: 50 Nm
  • Maximum steering wheel velocity: 1800 deg/s

  • Real-time configuration for the Steering-in-the-Loop test bench
  • Expandable with multi-domain HIL platform including the integration of chassis and ADAS ECUs

Hands Off Clutch

The optional clutch system decouples the force transmission of the steering robot. Therefore, the steering return (lateral transient response test) can be validated for deterministic and reproducible use according to ISO 7401. The newly designed connection to the steering column enables precise adjustment of the rotational moment of inertia to model the real setting in detail.

Driver-in-the-Loop Platform

Driver-in-the-Loop is an optional platform that can be coupled to test the steering performance with a real driver. The platform enables fast and easy switching between steering robot and driver platform is possible. The test bench can be adjusted to the real driving position and is handy to operate from the driver’s seat.

picture Driver-in-the-Loop