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Class-8 Heavy Truck Duty Cycle Project Final Report - Center for ...

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on vehicle motion and position. The GPS antenna is mounted on top of the<br />

tractor cab to obtain the best possible satellite reception. The VBOX is<br />

located in a protective container in the truck cab storage space, along with<br />

other equipment. It sends data to the eDAQ using the J1939 communication<br />

protocol.<br />

Figure 4.3-1: VBOX and <strong>Truck</strong> Cab Storage Space<br />

Figure 4.3-2: GPS Antenna and Tractor Top Location<br />

4.4. Vehicle Data Bus<br />

The J1939 vehicle data bus is present on most newer truck models and is<br />

accessible in the dashboard fuse panel. It provides in<strong>for</strong>mation on fuel<br />

economy, current gear, engine speed, and many other vehicle parameters.<br />

Figure 4.4: J1939 Vehicle Bus Connector in Dashboard Fuse Panel<br />

D-11

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