Hybrid Simulation: mHIL Steer

The mechanical Hardware-in-the-Loop (mHIL) Steer solution combines a computational full-vehicle model with a physical steering test system and specimen to create a vehicle-level simulation environment that enables steer development engineers to benchmark, characterize, set-up, tune, and validate electric and hydraulic power steering systems at the sub-system and vehicle levels.


  • Full subsystem evaluation with maneuver based testing
  • Algorithm development and validation
  • Fault and limit handling event testing
  • Steering rack durability and characterization evaluations
  • Steering effort evaluation
  • EPS pre-tuning
  • Warranty program research
  • Vendor certification

Test Specimens

  • Electric Power Steering Systems
  • Hydraulic Power Steering Systems

Key Product Features

Accelerated Testing

mHIL techniques compress vehicle development schedules by enabling meaningful evaluation and validation subsystems and vehicles earlier in development - well before the availability of vehicle prototypes

Innovative Technology

Real components can be substituted for difficult-to-model components when performing virtual simulations, enhancing characterization and improving model development

Cost Efficient

Reduces the number of vehicle prototypes required, minimizes instrumentation and data acquisition costs and streamlines final proving ground validation

Enhanced Safety

Expected and unexpected fault conditions more easily detected and safely evaluated in a laboratory environment

Technical Overview

mHIL Steer
A mechanical Hardware in the Loop (mHIL) system provides a laboratory method for evaluating the effects of physical chassis elements (in this case the steer sub-system) on vehicle-level attributes (in this case vehicle handling).

  • An MTS steer test system with customer steering sub-system installed on it represents the mechanical hardware, which is put in place of modeled steer element(s) within a vehicle simulation model
  • The steering sub-system consists of the steering rack and pinion assembly, tie rods, tie rod ends, intermediate steering input shaft and steering column, along with necessary fixturing to simulate a realistic vehicle configuration.  
  • The steering system is actively controlled by an ECU . 
  • The steering system and the ECU are driven in the modeled vehicle on a modeled track as if they were on a real vehicle and track.

The steering test system applies loads and/or displacements to the mechanical steer hardware based on inputs from the vehicle simulation model, measures the hardware response, and then sends these responses back to the vehicle simulation model. The mechanical hardware is included “in the loop” with the simulated vehicle.

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