Control method and control unit of driving circuit of electric vehicle as well as electric vehicle

Abstract

The invention provides a control method and control unit of a driving circuit of an electric vehicle as well as the electric vehicle. The driving circuit comprises a boost unit and the control unit, wherein the boost unit is used for receiving the output voltage of a power battery and used for outputting booster voltage to a motor; and the control unit is used for outputting a control signal to the boost unit. The control method comprises the following steps of obtaining the running state of the electric vehicle, wherein the running state comprises a required output voltage; and judging operating state, wherein the operating state judging step comprises the following steps of judging whether the required output voltage is greater than a preset value, if the required output voltage is greater than or equal to the preset value, enabling the boost unit to start operating, enabling the boost unit to output the booster voltage to the motor, and if the required output voltage is smaller thanthe preset value, enabling the boost unit to stop operating. According to the control method and the control unit disclosed by the invention, through obtaining the running state, the system efficiency is improved, so that the problems of reduction of the torque of high-speed running of the motor, and the weak magnetism heating of a permanent magnet synchronous motor are effectively solved, and the problem that the high-speed output power of the motor is reduced caused by the reduction of the battery voltage can also be solved.

Description

technical field [0001] The invention relates to the field of new energy vehicles, in particular to a control method for an electric vehicle drive circuit, a control unit and an electric vehicle. Background technique [0002] Because electric vehicles do not burn gasoline to generate power, they are environmentally friendly and less polluting. They are widely used in places with high environmental requirements such as tourist attractions. The existing battery car is provided with a motor controller, which is used to convert the DC power outputted by the battery into a three-phase AC power and drive the motor to rotate. [0003] Electric vehicles have high requirements on the efficiency of the drive system due to the battery power supply. At present, only high-efficiency asynchronous motors or permanent magnet synchronous motors can be used to solve the problem. Due to the improvement of motor efficiency, the cost has increased significantly. Contents of the invention [0...

AI Technical Summary

Problems solved by technology

At present, only high-efficiency asynchronous motors or permanent magnet synchronous motors can be used to solve the problem. Due to the improvement of motor efficiency, the cost has increased significantly.

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