Method for controlling operating speed and torque of electric motor

A method for implementing an electric vehicle motor controller device, the method being implemented by a central processing unit (CPU), the method comprising:

• detecting, by a sensor, a current speed parameter and a current torque parameter of the electric motor;
• determining, by an operational model which includes a plurality of operation positions of the electric motor and an optimal operation region of an electric motor, each operation position indicating at least a value for a speed parameter, wherein the optimal operation region includes one or more of the operation positions, a torque parameter, an operating efficiency parameter of the electric motor, and a current operation position of the electric motor in the operational model based on the current speed parameter and the current torque parameter;
• determining, 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;
• calculating power requirements for two transition paths connecting the current operation position and the target operation position in the operational model, the two transition paths including a first path consisting of one vector, and a second path consisting of two vectors;
• selecting one of the two transition paths for controlling the electric motor based at least in part on the calculated power requirements;
• generating a first instruction to adjust at least one of the current speed parameter and the current torque parameter along the selected path to move the current operation position to an intermediate operation position corresponding to an intermediate speed parameter and an intermediate torque parameter and located in the optimal operation region;
• generating a second instruction to adjust the intermediate speed parameter and the intermediate torque parameter to move the intermediate operation position to the target operation position along the selected path;
• and
• executing the first and second instructions to adjust the current operation position to the target operation position.

An electric vehicle comprising:

• an electric motor;
• a motor controller device in communication with the electric motor;
• a central processing unit (CPU) in communication with the motor controller;
• and
• a storage device including an operational model stored thereon, the operational model including a plurality of operation positions of the electric motor and an optimal operation region of an electric motor, each operation position indicating at least a value for a speed parameter, wherein the optimal operation region includes one or more of the operation positions, a torque parameter and an operating efficiency parameter of the electric motor;
• wherein the CPU is configured to:
• detect, by a sensor, a current speed parameter and a current torque parameter of the electric motor;
• determine a current operation position of the electric motor in the operational model based on the current speed parameter and the current torque parameter;
• determine, 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;
• calculate power requirements for two transition paths connecting the current operation position and the target operation position in the operational model, the two transition paths including a first path consisting of one vector, and a second path consisting of two vectors;
• select one of the two transition paths for controlling the electric motor based at least in part on the calculated power requirements;
• generate a first instruction to adjust at least one of the current speed parameter and the current torque parameter along the selected path to move the current operation position to an intermediate operation position corresponding to an intermediate speed parameter and an intermediate torque parameter and located in the optimal operation region;
• generate a second instruction to adjust the intermediate speed parameter and the intermediate torque parameter to move the intermediate operation position to the target operation position along the selected path;
• and
• execute the first and second instructions to adjust the current operation position to the target operation position.