Control method of voltage set point of DC high-voltage and low-voltage converter of pure electric vehicle

Abstract

The invention relates to a method for controlling a voltage setting point of a direct current high-low voltage converter of a pure electromobile. The method sets output voltage of the direct current high-low voltage converter according to the temperature of the direct current high-low voltage converter, the temperature of a high-voltage storage battery and other information. The method has the advantages that the voltage setting point of the direct current high-low voltage converter is controlled according to efficiency of the temperature of the direct current high-low voltage converter, the temperature of the high-voltage storage battery and other information, reliability and stability of the system are improved, and the risk that a system cannot operate normally caused by temperature rising of.the high-voltage storage battery and a direct current-direct current high-low voltage converter is reduced.

Description

Technical field [0001] The invention relates to the technical field of pure electric vehicles, and in particular to a method for controlling the voltage set point of a DC high and low voltage converter of a pure electric vehicle. Background technique [0002] As the global environment continues to deteriorate and energy shortages, reducing air pollution and dependence on petroleum energy have become more and more issues of concern to all countries. In order to reduce environmental pollution and relieve energy pressure, research on energy-saving and environmentally friendly automobiles has become an inevitable trend in the development of the automobile industry in various countries. At present, the research and production of pure electric vehicles has become a development focus of the automobile industry in various countries. A pure electric vehicle is a car that uses a high-voltage battery as a power source for energy storage. It uses a high-voltage battery as a power source for...

AI Technical Summary

Problems solved by technology

[0004] In the existing technology, the voltage of the low-voltage output terminal of the DC high-voltage and low-voltage converter is fixed. On the one hand, the fixed DC-DC low-voltage output set point often cannot take into account the temperature state of the high-voltage battery of the system and the DC-DC converter itself. For example, when the operating temperature of the high-voltage battery is high, the set point of the DC-DC cannot be adjusted properly, so that the high-voltage battery always supplies electricity to the low-voltage battery and the vehicle load with a relatively large output power. Energy, not conducive to the protection of high-voltage batteries

Similarly, when the DC-DC operating temperature exceeds the normal operating range, it cannot reduce the low-voltage system to draw energy from the high-voltage system

When this happens, the working state of the system will often be deteriorated, that is, when the vehicle system is running for a period of time, the temperature of the high-voltage battery and the temperature of the DC-DC components will increase

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