New energy automobile low-voltage power supply management system and management method

Abstract

The invention discloses a new energy automobile low-voltage power supply management system and management method. The system comprises a DCDC controller, a DCDC converter, a whole vehicle controller,a vehicle body controller, a battery management system, a whole vehicle low-voltage load, an emergency power supply and a relay, wherein the DCDC controller is connected with the DCDC converter through a control signal line, the DCDC converter is connected with a power battery pack through a high-voltage wire harness, the whole vehicle controller is connected with the relay through a control signal line, the DCDC controller, the whole vehicle controller, the vehicle body controller, the battery management system and the whole vehicle low-voltage load are connected in parallel through low-voltage lines and are connected in series with the DCDC converter through low-voltage lines as a whole, an emergency power supply and the relay are connected in series through a low-voltage line and are connected in parallel with a vehicle control unit through a low-voltage line as a whole, and the DCDC controller and the vehicle body controller are connected in parallel through a low-voltage line andare connected in series with the emergency power supply through the low-voltage line as a whole. The system is advantaged in that the low-voltage power supply capability of the whole vehicle after anOFF gear can be improved, and cost performance of the new energy vehicle is improved.

Description

technical field [0001] The invention belongs to the field of new energy vehicles, and in particular relates to a low-voltage power supply management system and a management method for new energy vehicles. Background technique [0002] The intelligentization, electrification, networking and sharing of automobiles require more electronic and electrical equipment on the automobile, and the vehicle is required to be able to meet the growing demand for low-voltage power consumption of the "four modernizations" of automobiles in the OFF gear. The low-voltage power supply architecture that relies on lead-acid batteries to realize the start and standstill functions of the vehicle can no longer meet the needs of the "four modernizations" of automobiles. However, the low-voltage power supply architecture using intelligent supplementary power + lead-acid battery needs to continuously activate the high voltage, that is, the lead-acid battery provides the low-voltage load of the vehicle ...

AI Technical Summary

Problems solved by technology

The low-voltage power supply architecture that relies on lead-acid batteries to realize the start and standstill functions of the vehicle can no longer meet the needs of the "four modernizations" of automobiles

However, the low-voltage power supply architecture using intelligent supplementary power + lead-acid battery needs to continuously activate the high voltage, that is, the lead-acid battery provides the low-voltage load of the vehicle with the power required for sleep and startup. Convert and supply power to the low-voltage load of the vehicle. When it is detected that the power of the lead-acid battery is low, it is necessary to control the high-voltage system of the vehicle to power on and recharge the lead-acid battery. This will lead to low power conversion efficiency of the power battery and the electrical The cost is also high; in addition, if the vehicle is left standing for a long time, it is easy to cause the lead-acid battery to lose power, resulting in the failure of the vehicle to start, and the lead-acid battery will also bring a greater burden to the environment

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