Device and method for controlling range extender system of electric vehicle

The invention discloses a device and a method for controlling a range extender system of an electric vehicle. The method includes: after the range extender system is activated, if a whole vehicle system has no fault, judging whether a halt condition of a range extender is in a steady state or not; if yes, further judging whether the whole vehicle system has a power generation requirement or not; if yes, recognizing the power generation requirement, and respectively subjecting a power generator and an engine to modulo check according to the power generation requirement; if the power generator and the engine pass the module check, setting a target rotation speed of the power generator, and controlling the power generator to rotate at the target rotation speed to drive the engine to start and enable the engine to reach a starting rotation speed; after the engine reaches the starting rotation speed, controlling oil injection of the engine to start the engine. Therefore, safety and high efficiency in control of th