ASAM XIL is an API standard for the communication between test automation tools and test benches. The standard supports test benches at all stages of the development and testing process – most prominently model-in-the-loop (MIL), software-in-the-loop (SIL) and hardware-in-the-loop (HIL). The notation "XIL" indicates that the standard can be used for all "in-the-loop" systems. This has the advantage that it enables users to freely choose testing products according to their requirements and integrate them with little effort. Using ASAM XIL-compliant products allows users of test systems to mix and match the best components from different suppliers without having costly integration efforts.

The standard furthermore decouples test-cases from real and virtual test systems. This allows to transfer tests between different test systems with little to no migration effort. Consequently, tests can be easily re-used. Know-how is much easier transferred from one test bench to another, resulting in reduced training costs for development- and test engineers.

These advantages are the result of two major components of the ASAM XIL standard:

  • the framework, which provides data measuring and mapping functionality independent from the used test bench hardware and software.
  • the test bench, which provides port-based communication means to the simulation model, the ECU, the electrical subsystem and the ECU network.

Test automation applications, which use the ASAM XIL API, are used in all automotive E/E domains, e.g. drivetrain, steering, electric lighting, etc. Cross tests for ASAM XIL implementations are carried out regularly to ensure compatibility between test automation software and test benches.

The standard comes with a C# source code library, which contains open source software that can be used by framework developers to implement the XIL API. It covers about 69% of the standard's API methods. Provided methods are unit and data type conversion, reading mapping files, mathematical operations, and more. The source code has been professionally developed and constitutes a standard-compliant implementation of significant parts of the ASAM XIL API.


Standard Authors

AUDI AG, AVL LIST GmbH, Berner & Mattner Systemtechnik GmbH, BMW AG, Continental Automotive GmbH , D2T, Daimler AG, dSPACE GmbH, ETAS GmbH, HORIBA Automotive Test Systems GmbH, M&K Mess- und Kommunikationstechnik GmbH, MBtech Group GmbH & Co. KGaA, National Instrument Corporation, RA-Consulting GmbH, Robert Bosch GmbH, Softing Automotive Electronics GmbH, TraceTronic GmbH, Vector Informatik GmbH.




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Generic Simulator Interface
Test Automation
Current Version
Release Date
19 Jun 2017
Application Areas
  • Test automation using "in-the loop" systems:
  • HIL (hardware-in-the-loop)
  • PIL (processor-in-the-loop)
  • SIL (software-in-the-loop)
  • MIL (model-in-the-loop)
Specification Content
  • Programmers Guide
  • Generic UML model
  • Technology references for C# and Python
  • XML schemata
File Formats
  • xml
  • sti
  • stz
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