Online visualisation of the AUDI Pre Crash Basic safety system

Intuitive visualisation improves testing

During the function and system development process, typical critical situations on the road are reconstructed on the testing ground so that the functions in question can be tested, applied and approved. In order to be able to reproduce and evaluate the behaviour of the function, the testing specialists must have a wide variety of information at their fingertips. This includes vehicle parameters and signals, such as the steering angle, speed and braking pressure, together with the function's internal parameters and trigger conditions, for example commands sent to the actuators. Using the standard tools for recording and visualising bus signals, it is generally only possible to carry out an in-depth evaluation of the function after the testing has been completed. The disadvantage of this is that the process of evaluating the function is disconnected from the actual driving situation and that valuable development time is wasted. To enable the testing specialists and decision- makers to assess sequences of signals during a test drive and to draw the necessary conclusions, it must be possible to visualise the relevant signals in an intuitive and practical way.

Solution based on tablet PCs

Bertrandt Ingolstadt developed a tablet PC-based application for the live visualisation of the PCB functions on behalf of AUDI AG. This involves sending vehicle data wirelessly and in real-time to the tablet and presenting it in a clear and intuitive way. In order to accommodate the highly dynamic situation during the test, the application offers the option of automatically freezing sequences of signals when certain events occur, so that the user can identify and evaluate the relevant signal values, for example after an emergency stop.

 

Technical implementation

ADTF, the AUDI software environment for applications and tools, supplies selected vehicle signals, the results from the PCB algorithm and the information relating to the triggering of the actuators. This data is transferred to a local server via a generic interface using ADTF plug-ins, known as filters. The server makes the information available as a web service. The client application in the form of an Android app accesses the information and displays it to the user in visual form. The server solution enables several tablets to be used at once, so that more than one occupant of the vehicle can follow the test sequence.

 

Summary

The live visualisation of the PCB function on a tablet PC is an impressive demonstration of the benefits of using tablet and smartphone apps in the development of complex vehicle functions.