Control method and device for electric vehicle range extender system

Abstract

A method and an apparatus for controlling a range extender system of an electric vehicle, wherein the control method comprises: after a range extender system is activated, determining whether there is a fault in an entire vehicle system (S101); if no fault exists in the entire vehicle system, determining whether a stop condition of the range extender is in a stable state (S102); if the stop condition of the range extender is in a stable state, further determining whether the vehicle has power generation needs (S103); if the vehicle has power generation needs, then identifying the power generation needs, and according to such needs, performing mode check on a generator and an engine, respectively (S104); if the generator and engine pass the mode check, then setting a target rotation speed for the generator, and controlling the generator to rotate at a target rotation speed so as to impel the engine to start, so that the engine reaches a starting rotation speed (S105); after the engine reaches the starting rotation speed, performing fuel injection control on the engine to start the engine (S106). Thus, the present invention can ensure the safety and efficiency in the control of the range extender system, and can improve the success rate of starting a range extender by optimizing a start-control logic.

Description

technical field [0001] The invention relates to the technical field of electric vehicles, in particular to a control method and device for a range extender system of an electric vehicle. Background technique [0002] With the development of science and technology, the range extender for electric vehicles has solved the problems of short mileage and troublesome charging of electric vehicles to a certain extent. When the on-board battery is short of power, it can drive the electric vehicle to continue driving and charge the on-board battery without parking, thereby greatly expanding the range of activities of the electric vehicle. [0003] In the related technology, the power generation control function of the generator set is based on the instructions issued by the VMS (Variable MessageSign, clean energy vehicle powertrain controller), and at the appropriate time, the GCU (Generator Control Unit, power generation controller) determines the appropriate power generation mode. ...

AI Technical Summary

Problems solved by technology

However, the power generation control function of this generator set does not consider the steady-state problem of each working condition of the range extender.

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