Electric vehicle high voltage power distribution system power on and off control method
A technology for high-voltage power distribution and electric vehicles, applied in electric vehicles, vehicle components, electrical devices, etc., can solve problems such as lack of coordination, damage to high-voltage components, and insurance burnout, and achieve the effect of improving relevance and controllability
Active Publication Date: 2022-01-21
HUNAN CSR TIMES ELECTRIC VEHICLE
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Problems solved by technology
Since the battery manufacturer and the control assembly manufacturer are usually not the same company, the two systems generally only work according to their own conditions when they are matched. Without effective cooperation, it is easy to cause the contactor to be sucked, the fuse to be burned, and other high-voltage components to be damaged. and other phenomena
[0003] In addition, during normal operation, the repeated switching of the ignition key may cause the battery management system and the control assembly to be powered on and off repeatedly, and the frequency of voltage and current mutations is large, which will cause damage to the high-voltage components of the entire system
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[0049] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0050] The core of the present invention is to provide a method for improving the correlation between the battery management system and the control assembly in power-on and power-off control, and reducing the damage to high-voltage components caused by repeated switching of the ignition key.
[0051] Please refer to figure 1 and figure 2 , figure 1 The connection diagram of the control circuit based on the control method provided by the present invention; ...
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The invention discloses a power-on / off control method for a high-voltage power distribution system of an electric vehicle, comprising: step S1: VCU and BMS control the closing of the main positive contactor and the main negative contactor according to preset closing conditions; step S2: the VCU controls the supporting capacitor Precharge and judge whether the precharge is completed, if so, execute step S3; step S3: VCU controls the main contactor to close; step S4: VCU judges whether the ignition key is in the ON position, if not, execute step S5; step S5: VCU controls the The output of the assembly is processed to limit the speed and power and collect the current in the main contactor; Step S6: When the current in the main contactor meets the preset cut-off conditions, the VCU controls the main contactor to disconnect and judges whether the ignition key is in the ON gear. If no, execute step S7; if yes, execute step S2 after a preset time delay; step S7: VCU sends a power-off command to the BMS. The method can improve the correlation between the battery management system and the control assembly in power-on and power-off control, and reduce damage to high-voltage components caused by repeated switching of the ignition key.
Description
technical field [0001] The invention relates to the technical field of high-voltage power distribution of electric vehicles, in particular to a method for controlling power on and off of a high-voltage power distribution system of electric vehicles. Background technique [0002] When electric vehicles use high-voltage electricity, the battery management system and the control assembly's respective controllers have their own up-and-down point process to provide high-voltage for electrical equipment. Since the battery manufacturer and the control assembly manufacturer are usually not the same company, the two systems generally only work according to their own conditions when they are matched. Without effective cooperation, it is easy to cause the contactor to be sucked, the fuse to be burned, and other high-voltage components to be damaged. And so on. [0003] In addition, during normal operation, the repeated switching of the ignition key may cause the battery management sys...
Claims
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IPC IPC(8): B60L3/00
CPCB60L3/00
Inventor 黄志勇彭再武王征宇陈竹张新林刘毅沈泽华夏一帆朱思维周稳
Owner HUNAN CSR TIMES ELECTRIC VEHICLE