Diesel oil tank heating system and control method thereof

The invention discloses a diesel oil tank heating system and a control method thereof. The heating system comprises a first heating device fixedly installed inside a main fuel tank, and the first heating device is communicated with an engine cooling liquid system to form a loop; a flow regulating valve arranged at a liquid inlet of the first heating device and used for regulating the flow of cooling liquid entering the first heating device; and a second heating device, which is an electric heating device and is powered by a storage battery of a vehicle. The control method comprises the steps of step 1, obtaining the oil quantity W in the main fuel tank, the oil temperature Tcy at an oil suction opening of the main fuel tank, the temperature Tlqy of the cooling liquid at a liquid inlet of the first heating device, the flow Q of the cooling liquid entering the first heating device and the voltage U of the storage battery; and step 2, controlling the opening degree of the flow regulating valve and the current of