Driving system and driving method of electric vehicle

Abstract

The invention discloses a driving system and a driving method of an electric vehicle, belonging to the technical field of electric vehicles. The drive system includes: a power battery, a driver, a motor, a detection module, a torque given module and a controller, the driver includes a filter module, a first conversion module, a first capacitor and a second conversion module; the positive electrode of the power battery and the filter module The input end of the filter module is connected to the input end of the filter module, and the first output end of the filter module is connected to the AC end of the first conversion module; one end of the first capacitor is respectively connected to the DC input ends of the first conversion module and the second conversion module, and the other end of the first capacitor It is respectively connected with the DC output terminals of the first conversion module, the second conversion module and the negative pole of the power battery; the AC terminal of the second conversion module is connected with the motor. The invention expands the speed regulation range of the electric vehicle by raising the bus voltage, without the need of field weakening control, increases the output power of the system, and improves the driving efficiency.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of electric vehicles, and in particular to a driving system and a driving method of an electric vehicle. Background technique [0002] With the improvement of people's awareness of environmental protection, environmentally friendly and energy-saving electric vehicles are playing the role of replacing fuel vehicles, and the technology of electric vehicles has developed rapidly. With the development of electric vehicle technology, people have higher requirements for the performance of the drive system in electric vehicles. For example, the drive system is required to have the ability to have a wide speed range, that is, the drive system is required to have a higher maximum speed. . [0003] Currently, see figure 1 , the drive system used by electric vehicles usually includes a power battery 110, a driver 120 and a motor 130, the driver 120 is connected to the power battery 110 and the m...

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Problems solved by technology

[0004] When the motor is running at high speed, in the process of field weakening control of the motor, if the magnetic field of the motor is to be weakened, it is necessary to increase the direct-axis demagnetization current component of the motor and reduce the quadrature-axis demagnetization current component of the motor, that is Increase the reactive current component and reduce the active current component, and because the reactive current component of the motor is increased, the power factor of the motor will be reduced, which will lead to a decrease in the output power and efficiency of the drive system

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