A PLC-based electric vehicle power management system and method

Abstract

The invention discloses an electric vehicle power management system and method based on PLC control. The electric vehicle power management system comprises a PLC, a voltage polling module, a temperature polling module, a current sensor, an auxiliary power supply and a displayer. The PLC obtains the voltage, the temperature and the current of each battery unit of a vehicle-mounted battery pack in real time through the voltage polling module, the temperature polling module and the current sensor. Then, the PLC calculates the SOC of the vehicle-mounted battery pack and the SOC is displayed by the displayer. According to the electric vehicle power management system and method based on the gating performance of the PLC, the working voltage, the working temperature and the like of a battery cell are monitored in real time through the voltage polling module, the temperature polling module and the like, and the PLC is simple and easy to learn; on the premise that all needed functions are achieved, the electric vehicle power management system and method accord with the logic habits of electrical working personnel, the development cost and the use cost can be reduced, the generality of a control system is improved, necessary detection data are provided for calculation of more accurate SOC, and the improvement of the accuracy of the battery management system is facilitated.

Description

technical field [0001] The invention relates to a management system for storage battery packs applied to electric vehicles or other fields, and in particular to a PLC (programmable logic controller)-based control system and method for electric vehicle power supply management. Background technique [0002] Electric vehicles have become the development trend of future automobiles. They have the advantages of energy saving, environmental protection and low noise, and can especially solve the fatal blow brought by the oil crisis to the automobile industry. [0003] In recent years, although electric vehicle technology has made great progress, there are still many problems before it is fully promoted, and the energy management system is one of them. As the power source of electric vehicles, battery packs (vehicle power battery packs) are composed of many single batteries (battery units) connected in series. The performance and quality of each single battery directly affect the po...

AI Technical Summary

Problems solved by technology

In addition, pure electric vehicles still have the disadvantage of short mileage. In order to facilitate the driver to know the mileage at any time and arrange the trip reasonably in advance, it is necessary to estimate and display the SOC (state of charge)

[0004] However, the usual battery management system is controlled by the vehicle controller, which greatly limits the versatility of the battery management system and increases the difficulty of use and development costs.

At the same time, in the prior art, only the overall voltage of the battery pack is often tested, and the SOC is qualitatively judged or roughly estimated based on the test results. The estimated results cannot accurately reflect the actual working conditions of the battery pack, and it is impossible to conduct a comprehensive evaluation of the battery pack. , accurate state estimation, and thus cannot correctly estimate and display the mileage of electric vehicles, which is not conducive to the popularization and application of electric vehicles

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