In order to simulate real situations for the communication networks in a vehicle it is necessary to perform extensive test drives in a real environment. Large amounts of data need to be acquired, recorded, and, afterwards, accessed.
Shortly before production maturity, in-depth testing in vehicles is typically conducted in the context of test drives. To achieve the greatest possible test coverage, some of these tests are performed under extreme environmental conditions. Whether they are winter tests in Finland at -30C, hot weather tests in Death Valley at over 50C, or week-long drives through the Brazilian rainforest at high humidity and on rough roads, in the end the vehicle and all of its components must operate smoothly. Iinstalled data loggers must be able to withstand these harsh conditions as well. This means that they must be mechanically rugged and operate reliably over a broad range of temperatures.
At first glance, it would seem reasonable to use a notebook-based solution for in-vehicle data logging. Together with a suitable network interface the notebook should be able to offer all required capabilities, because functionality can be implemented in software. However, commercially available notebooks cannot handle the required temperature range. Furthermore, the system must first be booted, which takes some time—even with fast notebooks. This implies another requirement for data loggers: Short startup times. Data must be acquired quickly enough for the first message on the bus to be logged.
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