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High-Performance Steering Test Bench

The illustrated setup represents an EPS test bench for applications that require maximum dynamics and precision. The linear motors can insert tire-road forces even more precisely and with high frequencies. Developers can thoroughly qualify and analyze steering systems for passenger cars and commercial vehicles by replaying measurement data, using synthetic test vectors and performing closed-loop simulation with a vehicle model. Because these steering test benches fulfill the highest requirements and even make it possible to determine the transfer behavior, they optimally support the development process for steering ECUs.

Features:

  • Steering test bench for electromechanical power steering
    • Servomotor on the steering column (C-EPS)
    • Servomotor on the steering box (R-EPS)
  • Free setup of the components on the tooling plate
  • Synchronous motor for simulating the driver torque and the steering wheel position
  • Two synchronous linear motors for simulating the road forces acting on the tie rods on both sides
  • Prepared for injecting lateral forces that act on the steering rods
  • Prepared for virtual test drives thanks to the seamless integration into the ASM Vehicle Dynamics Model
  • Stimulus generators implemented in MATLAB/Simulink for synthetic stimuli
  • Prepared for testing steering feel and haptics 
  • Dimensions: 5 m x 3 m x 2.5 m (approx. 16.4 x 9.8 x 8.2 ft)
  • Weight: 15,000 kg (aaprox. 3,307 lb)
  • Connected load: 45 kW

References:

  • Numerous turn-key projects for OEMs and suppliers in Europe

Motor Characteristics
Motor Synchronous motor without transmission
Motor encoder HIPERFACE® motor feedback-system
Servo amplifier LTI Servo One
Control strategy torque Forward control (motor current)
Control strategy position Cascade control with subsidiary speed and torque control
Maximum continuous torque [Nm] 50
Maximum displacement [deg] Unlimited
Maximum speed [rpm] 500

 

Steady State Control Accuracy
Torque [Nm] ±0.5 (depends on device under test and torque transducer)
Position [deg] ±0.01

 

Torque Sensor Characteristics
Measurement range [Nm] ±50
Accuracy [Nm] ±0.25

Motor Characteristics
Motor Synchronous linear motor
Motor encoder HIPERFACE® motor feedback system
Servo amplifier LTI Servo One
Control strategy force Overlain feedback control (force transducer and disturbance variable compensation)
Control strategy position Cascade control with subsidiary speed and force control
Maximum continuous force [N] 15000
Maximum displacement [m] ±200e-3
Maximum velocity [m/s] ±900e-3

 

Steady State Control Accuracy
Force [N] ±50 (Depends on device under test and force transducer)
Position [m] ±0.1e-3

 

Force Sensor Characteristics
Measurement range [N] ±20000
Accuracy [N] 20

Further Information