Motor control method for electric vehicle, control unit and vehicle

Abstract

The invention provides a motor control method for an electric vehicle, a control unit and a vehicle, and belongs to the technical field of motor control. The method comprises the steps that a corresponding relation table among the rotating speed, the demand torque and the adjustment code of a motor of each vehicle type is established, the adjustment code is three-digit data, the number of the highest digit of the adjustment code represents a torque limiting mode, the number of the middle digit of the adjustment code represents a driving torque adjustment coefficient, and the number of the lowest digit of the adjustment code represents a feedback torque adjustment coefficient; obtaining vehicle type information of a target vehicle, a current demand torque, and a current available torque and a rotating speed of a motor; according to the vehicle type information, the current required torque and the current rotating speed, a corresponding adjustment code is obtained in a corresponding relation table; calculating an output torque limit value of the motor according to the numerical value of the adjustment code, the middle digit and the lowest digit of the adjustment code and the current available torque; controlling the motor to work according to the output torque limit value. The control method provided by the invention can reduce the risk of over-discharge of the battery.

Description

technical field [0001] The invention belongs to the technical field of motor control, and in particular relates to a motor control method, a control unit and a vehicle for an electric vehicle. Background technique [0002] The main energy source of new energy vehicles is the battery. Due to the temperature of the battery itself, the change of SOC (State of Charge, state of charge) and the change of SOH (State Of Health, battery health) after long-term use, there is a work that needs to limit the discharge power of the battery. condition. Usually, the configuration management of the vehicle is based on the current available power given by the battery, and the vehicle control module distributes the high-voltage energy based on the available power of the battery, covering all the high-voltage electrical loads of the electric vehicle or hybrid vehicle. For example: loss of DCDC converter, high-voltage air conditioner, drive motor, and battery and high-voltage load distribution ...

AI Technical Summary

Problems solved by technology

When performing power management, it is necessary to consider the output power and consumption under each load condition. In the process of acceleration and deceleration changes, the speed is a change based on the current state, and the torque output is based on an output given by the control. When the speed is increasing, the actual output of the power will be larger than the given control power after the torque is executed based on the previous state. For this reason, power limitation is required.

[0003] In the energy management of the battery, especially the driving loss is the battery discharge power as the main loss power. If the driving part is not managed properly, it will affect the discharge characteristics of the battery and affect the battery life, and even cause the battery life to end due to over-discharge.

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