Battery overcurrent protection method

Abstract

The invention relates to a battery overcurrent protection method, and belongs to the technical field of vehicles. The method comprises the steps that when a driving mode is a power assisting mode, the maximum power assisting torque of a starting integrated motor is determined on the basis of the current maximum allowable discharging power of a 48V battery and the current required power of a DCDC, the output torque is determined on the basis of the maximum power assisting torque of the starting integrated motor, and the starting integrated motor is controlled to carry out power output through the output torque; when the driving mode is a recovery mode, the maximum recovery torque of the heuristic integrated motor is determined based on the current maximum allowable charging power of the 48V battery and the current required power of the DCDC, the recovery torque is determined based on the maximum recovery torque of the heuristic integrated motor, and the heuristic integrated motor is controlled to generate power at the recovery torque. By the adoption of the method and device, the battery overcurrent phenomenon can be prevented under the condition that the vehicle runs normally, the safety of the vehicle is improved, and the use experience of a user is enhanced.

Description

technical field [0001] The present application relates to the technical field of vehicles, in particular to a battery overcurrent protection method. Background technique [0002] With the rapid development of the automobile industry, the problem of energy shortage is becoming more and more serious. In order to save energy, 48V light hybrid systems are gradually emerging. The 48V mild hybrid system includes a 48V battery, a DCDC (Direct Current, DC step-down converter) and an Inspired integrated motor. The 48V battery can supply power to the DCDC and the Inspired integrated motor, and the DCDC is also electrically connected to each load in the vehicle. When the vehicle is in normal mode, the 48V battery can supply power to the DCDC, which converts high voltage to low voltage, and then supplies power to various loads. When the vehicle is in booster mode, the 48V battery can supply power to the DCDC and at the same time supply power to the Inspired integrated motor, so that th...

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Problems solved by technology

[0004] However, when the relay is disconnected, the 48V battery will report a serious fault, which will cause the vehicle system to fail to operate normally, which will bring serious safety hazards. At the same time, this disconnection method will cause the 48V battery to be irreparable and can only be replaced. The new battery is solved, which seriously affects the user experience

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