FEATURE TEST & MEASUREMENT
TESTING VEHICLES FASTER with an autonomous DAQ system
Vehicles are tested during the development phase at SEAT. By installing HBM autonomous data acquisition systems, SEAT has been able to greatly improve the test times for its cars
further action. The ADAQ is designed to warn the driver when an error occurs. catman was the software of choice for
The HBM MX1615B V
olkswagen Group specifications require that vehicles are tested during the
development phase at SEAT in order to ensure that quality and durability standards are met. The challenge for the SEAT team was to set up a data acquisition (DAQ) system that is fast enough to provide more precise control over the instrumented parts and the entire data acquisition. The team developed an
autonomous acquisition, communication and analysis process that meets all requirements – the ADAQ system. Together with the Polytechnic University
catman was the software of choice for the ADAQ project
of Catalonia, SEAT has developed a system for an Autonomous Data AcQuisition process, also called ADAQ. It is comprised of QuantumX DAQ modules, catman software and an electronic circuit that guarantees both the power supply for all devices and the vehicle-pilot interaction. The following DAQ systems and sensors were used: the HBM QuantumX MX840B universal module, the HBM MX1615B strain gauge module and one HBM CX22B-W datarecorder, thermocouples, accelerometers, strain gauge bridges, displacement sensors, and, in addition, 14 CAN channels and GPS. Due to the wide range of conditions in which the vehicle is likely to be tested, the QuantumX equipment was securely mounted in the vehicle.
THE AUTONOMOUS SYSTEM The car is shipped to a test track, where the test is carried out. The ADAQ system tranfers data to the headquarters daily, so the analysts can check and analyse the data. The system is started up, when the vehicle is turned on. It performs the following steps: boot up the catman software; initiate data storage while the vehicle is on the road; and stop recording once the car is back at the circuit pit. The system reports irregularities to the analysts to enable them to take
34 DECEMBER/JANUARY 2018 | INSTRUMENTATION
the ADAQ project because it provides many different automation options. The setup includes the auto launch of catman, the auto loading of the acquisition project and the automated execution of the first DAQ job. Data files are recorded every ten minutes. If an unexpected error occurs, the ADAQ system will record up to the moment the error is detected so no data will be lost. The following filename format is used: XXXYYMMDDHHMMSS, with each letter corresponding to digits for project identification, year, month, day, hour, minute and second. The start and stop acquisition triggers use GPS parameters. This feature that provides greater precision requires three conditions to be specified for starting and stopping acquisition: latitude and longitude coordinates and vehicle speed (greater than zero to initiate acquisition and equal to zero when the test is completed).
The ADAQ system was set in the trunk of the car SEAT car strain gauge
/ INSTRUMENTATION
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