Test system family focuses on network characteristics of ECUs, supports FlexRay

March 09, 2012 // By Christoph Hammerschmidt
The new generation of the TESSY series from automotive test platform vendor Goepel electronic GmbH is designed as test system family for network characteristics of electronic control units (ECUs). It features optimised hardware architecture and significantly extended range of functions. The most newsworthy feature of the new family is the support of the FlexRay bus for communication behaviour test of ECUs, which adds to the already available bus families of CAN, LIN and K-Line.

In terms of hardware the FlexRay option is based on the FlexRay controller from the series 61 as well as on the FlexScope technology from Goepel electronic. The following range of tasks can be mastered: signal-based remaining bus simulation, measuring of timings within and between communication messages, analysis of data traffic, tracing of bus synchronisation and error simulation.

Measurement capabilities for testing the physical layer have been improved over earlier versions by using a higher-performance four-channel oscilloscope and signal-based trigger options at the message level. Determination of the sampling point in time is performed according to a proprietary method patented by Goepel electronic, and has been extended to 1 Mbaud. The capability of measuring the sampling point in time now on the LIN bus is among the very highlights and unique selling propositions of the new tester generation.

Due to increased flexibility of the system's relay matrix, the system can route a significantly greater number of measurement and stimuli resources. Mainly the generation of internal CAN and LIN networks for simulation tasks will benefit from these enhancements. Inline with the tendency that more and more control units can’t be tested without the original peripherals (e.g. actuators) being connected, the current carrying capacity of terminal 30 (supply) has been increased to 40 amps.

A new testing horizon has been opened up through integration of so-called CAN hub modules into the test system. They provide multiplexing of the CAN bus using a proprietary method which has been registered for patent approval. The CAN hub modules use parameterisable filters to include additional control units or external CAN networks (e.g. breadboards or laboratory vehicles) into the experimental setup. Furthermore they enable parallel testing of several identical control units in a multiplex operation. This will help to take optimal advantage of the test system for endurance tests, as longer tester runs (e.g. overnight or during the weekend) are possible without the need of manual exchanging UUTs.