What is Hardware-in-the-Loop?

Hardware-in-the-Loop (HIL, HWIL) is a technique that helps to develop and verify complex real-time systems.

The system under test is connected to the Hardware-in-the-Loop simulation via its electronic interface so that there is no difference between the actual signals during the simulation and the real environment.

For example sensors and actuators are often emulated.

With HILSTER TestBench it is possible to create, maintain and execute flexible and automated Hardware-in-the-Loop tests.

Application Areas

  • Embedded systems with functional safety requirements (SIL)
  • Real-time systems
  • Controllers of any kind
  • Medical devices
  • Automotive systems
  • Radar systems
  • Robotics
  • Power systems
  • Offshore systems


  • Reduction of development costs by simulating the actual field of application
  • Reduction of project risk by detecting and fixing errors as early as possible in the project
  • Improvement of the product quality by generating error conditions
  • Fast feedback loops through automated execution in a Continuous-Integration system (CI)
  • Changes to system requirements can be verified with little effort through small modifications to the tests
  • Tests can be reused easily