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Automotive

Summary of Selected Papers

Development of software for automotive systems has become increasingly complex. Sophisticated driver assistance, infotainment and Car2X-communication systems as well as advanced active and passive safety-systems result in complex, software-intensive embedded systems. As these feature-driven subsystems may be arbitrarily combined by the customer, a huge amount of distinct variants needs to be managed, developed and tested. Thus, we are carrying out numerous projects in the automotive software engineering, here we concentrate on three aspects: (1) Autonomous driving; (2) Modeling of functional; and (3) Logical architectures and on variability.

To understand all these features, we describe in [GRJA12] a requirements management that connects with features in all phases of the development process helps to handle complex development tasks and thus stabilizes the development of automotive systems.

Autonomous driving

Quality assurance, especially of safety-related functions, is crucial to successfully deploy autonomous vehicles. In the Carolo project (see [BR12b],[BR12] and Autonomous Driving & Intelligent Driver Assistance), we have developed a rigorous test infrastructure for intelligent, sensor-based functions through fully-automatic simulation (not only visualization) of the car within its surrounding: the city, pedestrians and especially other cars [BBR07]. Beside the simulation of a complete autonomous car with its sensors and actors, the simulation environment may also be used to test dedicated subsystems without any real hardware involved. By producing sensor input from the simulation and comparison of expected and actual behavior, subsystems may be automatically validated and thus developed in an agile way.

Modeling logical architecture: function nets

The conceptual gap between requirements and the logical architecture of a car is closed in [GHK+07] and [GHK+08]. Here, feature views modeled as a function net are used to implement the mapping between feature-related requirements and the complete logical architecture of a car.

Variability of car software

Automotive functions that may be derived from a feature view are often developed in Matlab/Simulink. As variability needs also to be handled in development artifacts, we extended Matlab/Simulink with delta modeling techniques (see also Variability & Software Product Lines (SPL)). A core Simulink model represents the base variant that is transformed to another variant by applying deltas to it. A delta contains modifications that add, remove, or modify existing model elements. Thus, features of an automotive system may be developed modularly without mixing up variability and functionality in development artifacts [HKM+13]. New delta models that derive new variants may be added bottom-up without the need for a fully elaborated feature model.

Delta-Simulink

In practice, product lines often originate from a single variant that is copied and altered to derive a new variant. In [HRRW12], we provide means to extract a well defined software product line from a set of copy and paste variants. This way, further variant development is alleviated, as new variants directly reuse common elements of the product line. To identify potential product lines and variants, [RSW+15] describes an approach to use logical and model checking techniques to identify commonalities and differences of two Simulink models describing the same control device in different variants and thus allows to understand incompatibilities.


Delta-Simulink

Summary

  1. A consistent requirement management leads to a more stable and predictable development of automotive systems.
  2. Various functional and architectural variants need to be explicitly managed in all phases of the development cycle.
  3. Agile development techniques may be used by introducing continuous tests based on automatic simulations.
  4. The quality of autonomous driving cars and smart assistance systems is assured using automatic simulations.

Related Topics

Selected Related Publications



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