Method for controlling operating speed and torque of electric motor

A method for controlling an operating speed and the torque of an electric motor in an operational model, wherein the operational model comprises a plurality of operation positions of the electric motor and an predetermined optimal operation region of the electric motor, each operation position corresponding to indicating at least a value for a speed parameter, a torque parameter and an operating efficiency parameter of the electric motor:

• the optimal operation region includes one or more of the operation positions, the method being implemented by a central processing unit (CPU) configured to execute machine-readable instructions the method comprising:
• receiving, from a sensor, by the CPU, a current speed parameter and a current torque parameter corresponding to a current operation position of the electric motor in the operational model;
• receiving, from a driving input system, by the CPU, a target speed parameter and a target torque parameter corresponding to a target operation position of the electric motor in the operational model;
• determining, by the CPU, whether the current operation position is located in the predetermined optimal operation region of the operational model according to the current speed parameter and the current torque parameter of the electric motor;
• if the current operation position is not located in the optimal operation region, determining, by the CPU, whether to select an intermediate operation position in the optimal operation region or directly move the current operation position to the target operation position without selecting an intermediate operation position in the optimal operation region;
• and
• in response to determining the intermediate operation position in the optimal operation region is to be selected:
• generating a first instruction, by the CPU, for adjusting at least one of the current speed parameter and the current torque parameter along a first path to move the current operation position to the intermediate operation position which corresponds to an intermediate speed parameter and an intermediate torque parameter and is located in the optimal operation region;
• and
• in response to the current speed parameter and the current torque parameter having been adjusted to the intermediate speed parameter and an intermediate torque parameter further generating a second instruction, by the CPU, for adjusting the current speed parameter and the current torque parameter to move the current operation position to the target operation position along a second path.

An electric vehicle comprising:

• an electric drive motor;
• a battery configured to power the electric drive motor;
• and
• an electric vehicle motor controller including a processor and a memory with an operational model stored therein, the operational model including a predetermined optimal operation region of the electric drive motor, and the processor configured to:
• detect, by a sensor, a current speed parameter and a current torque parameter of the electric drive motor;
• determine a current operation position of the electric drive motor in the operational model based on the current speed parameter and the current torque parameter;
• determine, from a driving input system, by the processor, a target speed parameter and a target torque parameter corresponding to a target operation position of the electric motor in the operational model;
• determine whether the current operation position is located in the predetermined optimal operation region;
• if the current operation position is not located in the predetermined optimal operation region, determine whether to select an intermediate operation position in the optimal operation region or directly move the current operation position to the target operation position without selecting an intermediate operation position in the optimal operation region;
• and
• send control signals configured to transition the electric drive motor from the current operation position to the target operation position in the operational model.