The VBOX3i GPS data-logger by Racelogic (UK) measures speed, position, acceleration, distance, slip angle, and vehicle pitch/roll angle. The recently introduced 100-MHz dual-antenna option is already used to test driver assistance systems. The data-logger provides two CAN interfaces.
THE GPS DATA-LOGGER IS A TEST instruments for non-contact speed and distance measurement. Vehicle manufacturer use the product in their test department to carry out tests such as brake distance measurements, performance testing, aquaplane testing, coast-down measurements, etc. The data-logger measures time, position, velocity, heading, height, vertical velocity, lateral acceleration, longitudinal acceleration, radius of turn, centerline deviation and distance between two vehicles, at 100 samples per second, purely from GPS. By adding the Inertial Measurement Unit (IMU), you can measure pitch, roll and yaw angles, again at 100 Hz.
Many other external parameters can be logged, either by using the four local 24-bit analog inputs from a number of VBOX input modules or directly from the CAN-based in-vehicle networks using the Racelogic Vehicle CAN Database. The database supports the SAE J1939 application profile (e.g. parameter group numbers).
In the shown brake testing example, all four wheel-speeds have been extracted from the CAN network and overlaid with the true vehicle speed. A maths channel in the VBOX software has been used to calculate the individual wheel-slip percentage, and is plotted above the other curves. In addition, you could also display x- and y-acceleration, distance travelled, engine rotation per minute, four analog channels, heading, height, vertical velocity and vehicle position, without any additional sensors or modules.
The data-logger is not only used for passenger cars and road trucks, but also for mining trucks and other transportation including ships. For mining trucks the product collects data such as road inclination, road camber, load and load distribution, speed, tire pressure, and ambient temperature. The evaluated data is used to improve the construction of the quite expensive tires. Road camber, inclination and radius of turn can make a huge difference in the way that a tire goes through heat cycles. If the truck is being forced to turn too tightly or drive up too steep an incline, the TKPH (ton-kilometer per hour) values will be exceeded, resulting in overheating. This reduces the life of the tire. The company offers the dedicated Speed and Route Profiler software for mining operators and tire-makers.
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