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TASK

Our partner had to implement telematics system in bus fleet to execute Eco
Driving quality system. That required:
џ monitoring location and route of buses;
џ data on the speed, acceleration/deceleration of the bus;
џ data from the tachograph in real time;
џ control of physical condition of drivers with a breathalyzer;
џ diesel fuel consumption monitoring.

Data from tachograph is transferred to telematics unit via RS-232 input.
Tracker uses GPS to determine location of the bus, its speed and acceleration.

Data on instant fuel consumption is available in CAN/j1708 bus, it’s not possible to gather it from standard OBD II connector. Direct
connection to information bus of vehicle is required to read and transmit data on fuel consumption.

After connecting tachograph, only RS-485 (ASCII protocol) digital input of telematics unit remains free. Thus, to provide
transferring of fuel data to telematics system, a special device, that allows converting CAN/j1708 bus messages to ASCII
text format (understandable by a telematics unit), should be installed.

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