This paper focuses on the test bench-based application and analysis of electro-mechanical power steering (EPS). In the first part, the setup and physical structure of the test bench are described. It is shown how control parameter changes can be measured, using the assistance amplification as an example. In the next chapter, a method for a test bench-based pre-application is introduced. A hardware change in the servo-unit alters the steering feel and requires compensating that by changing the control parameters of the current (electrical) controller. The method of Design of Experiments is introduced to reduce the number of combinations of the control parameters. Based on the predefined test plan, measurements are made to create an empirical model. This model is further used in an optimisation problem to compute the optimal set of parameters. This optimum is validated by additional measurements.

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<div class="section abstract"><div class="htmlview paragraph">The accelerated processes in vehicle development require new technologies for function development and validation. With this motivation, Function-in-the-Loop (FiL) simulation was developed as a link between Software-in-the-Loop (SiL) and Hardware-in-the-Loop (HiL) simulation. The combination of real Electronic Control Unit (ECU) hardware and software in conjunction with virtual components is very well suited for function development and testing. This approach opens up new possibilities for mechatronic systems that would otherwise require special test benches. For this reason, an Electric Power Steering (EPS) was transferred to a virtual environment using FiL simulation. This enables a wide range of applications, from EPS testing to the development of connected driving functions on an integrated platform. Right from the early development phases, the technology can be used purposefully with short integration cycles. Throughout the entire development process, function development and validation can be effectively controlled and quality increased.</div></div>

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