Bus current control method, device, system, and storage medium

A bus current control method, comprising:

• obtaining a data set comprising a motor speed, an actual current and an actual torque corresponding to a current time point;
• determining a limit current at the current time point according to the motor speed,
• wherein the determining the limit current at the current time point according to the motor speed comprises:
• determining a limit current reference value at the current time point according to the motor speed, the limit current reference value being less than a target current value corresponding to a maximum allowable current of a bus;
• determining a motor speed change rate at the current time point based on the motor speed and a motor speed at a second historical time point adjacent to the current time point;
• and
• determining the limit current based on the motor speed change rate and the limit current reference value;
• determining an updated limit current at the current time point based on the limit current and a preset current value;
• in response to the limit current or updated limit current being less than the actual current, determining a deviation value at the current time point according to the limit current or updated limit current and the actual current;
• determining a target requested torque based on the deviation value and the actual torque, wherein the determining the target requested torque comprises:
• determining a torque correction value at the current time point according to the deviation value, a preset time parameter, and at least one preset correction coefficient;
• determining a limit available torque based on the actual torque and the torque correction value;
• obtaining a vehicle requested torque at the current time point;
• and
• determining the target requested torque as a minimum of the limit available torque and the vehicle requested torque;
• and
• determining the bus current according to the target requested torque to limit an overcurrent of the bus.