Method of controlling towing mode of eco-friendly vehicle

A method of controlling a towing mode of an eco-friendly vehicle, the method comprising:

• setting a towing mode between a towing vehicle and a towed vehicle by a first vehicle controller of the towing vehicle and a second vehicle controller of the towed vehicle;
• determining, by the first vehicle controller, whether a second battery of the towed vehicle needs to be charged, wherein the towing vehicle includes a first motor and a first battery and the towed vehicle includes a second motor and the second battery;
• and
• controlling charging of the second battery by executing different charge modes of the towing mode according to traveling conditions of the towing vehicle by the first vehicle controller, by charging the second battery of the towed vehicle while the towing vehicle tows the towed vehicle,
• wherein the executing different charge modes includes determining, by the first vehicle controller, a charge compensation torque of the first motor of the towing vehicle based on a chargeable torque of the second motor of the towed vehicle transmitted from the second vehicle controller of the towed vehicle and re-determining the first motor torque of the towing vehicle for satisfying a braking demand torque by the determined charge compensation torque of the first motor of the towing vehicle, and
• wherein the charging of the second battery of the towed vehicle is performed by selecting one of a charge mode during traveling, a regenerative braking charge mode, and a coasting charge mode for the charging of the second battery of the towed vehicle while the towing vehicle tows the towed vehicle so that the second motor of the towed vehicle is driven by a negative charge torque for charging the second battery while the towing vehicle accelerates or decelerates.