MOST150: End-of-line testing for Quality Assurance (QA)

July 07, 2011 // By Michael Schmidt
Many different suppliers are developing electronic control units (ECU) providing an interface to the MOST bus. Detailed compliance testing is required in order to eliminate faults and to ensure the correct behaviour of different MOST interfaces in the same network. By focusing on the challenge of testing, the PXI standard and simultaneous test philosophies have led to the development of the first PXI MOST150 interface.

The ECUs of a modern car are all linked together via various networking technologies like CAN, LIN or even FlexRay for safety critical applications. In the case of infotainment and multimedia systems, MOST has established itself as the de-facto standard, distinguished by high bandwidth and electrical robustness. MOST150, its third generation, makes high demands on automotive developments and testing environments. This article puts the focus on manufacturing, burn-in/run-in test, and reliability testing of ECUs implemented with a MOST interface. The upcoming problems for hardware, industrial standards and test strategies, and the methods for dealing with them will also be discussed.

Test system must accurately simulate real environment

To test the functions of a MOST ECU, it must be installed in a realistic vehicle environment to provide the input and output information it needs to perform its control tasks. Therefore, the test system must accurately simulate the vehicle environment. In the majority of cases, an ECU with MOST interface has a number of different communication interfaces other than MOST that have to be supported. One reason could be that the ECU has to act as a gateway and/or system components are combined into one unit.

An important issue in managing the manufacturing and industrial environments is to consider the established standards used for the hardware that is simulating the MOST interface. Especially for hardware, the standards are restricted to interchangeable systems/components and to hardware setups that are easy to expand. USB and Ethernet interfaces are not suitable due to poor reliability in hostile environments and long duration tasks. An often-used standard for such measurement and simulation systems is the PXI bus (PCI eXtensions for Instrumentation). Using PXI takes advantage of a robust, PC-based, and high-performance measurement and automation system. With PXI, the benefits of low cost, performance, flexibility, and a wide range of available cards form the basis of a multiplicity of test systems. So clearly the MOST appropriate solution, where

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