Heating system of electric vehicle

A heating system of a vehicle, the heating system comprising:

• a cooling line in which a radiator mounted with a cooling fan is disposed;
• a heating line including a cooling water heater heating cooling water and an internal heater for internal heating disposed therein, and fluidly connected to the cooling line;
• a first branch line fluidly connecting a first portion of the cooling line and a first portion of the heating line, and including a first electrically powered water pump and an electric part disposed therein;
• a second branch line fluidly connecting a second portion of the cooling line and a second portion of the heating line, and including a second electrically powered water pump disposed therein;
• a first valve disposed in the cooling line, the heating line, and a branch point of the first branch line, in which the first portion of the heating line and the cooling line are connected;
• a second valve disposed in the cooling line, the heating line, and a branch point of the second branch line in which the second portion of the cooling line and the heating line are connected;
• and
• a controller electrically connected to the first vale and the second valve, the first electrically powered water pump, the second electrically powered water pump, and the cooling fan,
• wherein the first valve and the second valve are three-way valves,
• wherein a heating mode of the heating system operates by the controller with operations of the first valve and the second valve, in a first mode in which the heating line and the second branch line form a closed circuit and the cooling line and the first branch line form the closed circuit, or in a second mode in which the heating line and the first branch line form the closed circuit, and
• wherein the first mode or the second mode is switched by the controller based on a temperature of the cooling water which flows on the first branch line downstream of the electric part, a temperature of the cooling water which flows on the first branch line upstream of the first electrically powered water pump, and a temperature of the cooling water which flows on the heating line downstream of the internal heater, an ON/OFF state of a heating switch, and an operation state of the cooling water heater.