Method for controlling operating speed and torque of electric motor
First Claim
1. A method for controlling the operating speed and torque of an electric motor, wherein the operational model comprises a plurality of operation positions of the electric motor, each operation position indicating at least a value for a speed parameter, a torque parameter and an operating efficiency parameter of the electric motor, 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 of the electric vehicle 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 optimal according to the current speed parameter and the current torque parameter of the electric motor; and
if the current operation position is not optimal;
adjusting at least one of the current speed parameter and the current torque parameter by moving the current operation position to the target operation position along via an intermediate operation position; and
amending the operation model by revising an efficiency parameter on a selected position in the operational model according to a calculated efficiency parameter on the target operation position.
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Accused Products
Abstract
Systems and methods for controlling the operating speed and the torque of an electric motor using an operational model are described. An operational model for the electric motor, including a plot of engine performance parameters, is used for reference, and a most efficient output path, which may pass through an optimal operation region in the operational model, is selected. The most efficient output path may be determined, for example, according to locations of a current output state and a to-be-reached target state in the operational model, enabling the operating state of the motor to reach the target state from the current operating state. By selecting a more efficient output path, the operating efficiency of the motor may be optimized, the life of a battery improved and/or the operating mileage of the vehicle may be increased, without significantly reducing the driving experience.
53 Citations
11 Claims
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1. A method for controlling the operating speed and torque of an electric motor, wherein the operational model comprises a plurality of operation positions of the electric motor, each operation position indicating at least a value for a speed parameter, a torque parameter and an operating efficiency parameter of the electric motor, the method being implemented by a central processing unit (CPU) configured to execute machine-readable instructions the method comprising:
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receiving, from a sensor, by the CPU, a current speed of the electric vehicle 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 optimal according to the current speed parameter and the current torque parameter of the electric motor; and if the current operation position is not optimal; adjusting at least one of the current speed parameter and the current torque parameter by moving the current operation position to the target operation position along via an intermediate operation position; and amending the operation model by revising an efficiency parameter on a selected position in the operational model according to a calculated efficiency parameter on the target operation position. - View Dependent Claims (2, 3, 4, 5)
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6. 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, each operation position indicating at least a value for a speed parameter, a torque parameter and an operating efficiency parameter of the electric motor, the method being implemented by a central processing unit (CPU) configured to execute machine-readable instructions the method comprising:
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receiving, from a sensor, by the CPU, a current speed of the electric vehicle 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 optimal according to the current speed parameter and the current torque parameter of the electric motor; if the current operation position is not optimal, determining, by the CPU, whether to select an intermediate operation position 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; adjusting at least one of the current speed parameter and the current torque parameter by moving the current operation position to the target operation position along via an intermediate operation position; and amending the operation model by revising an efficiency parameter on a selected position in the operational model according to a calculated efficiency parameter on the target operation position.
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7. An electric vehicle comprising:
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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 the electric vehicle; determine a current operation position of the electric drive motor in the operational model based on the current speed of the electric vehicle; 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 optimal to the current speed parameter and the current torque parameter of the electric motor; if the current operation position is not optimal, determine whether to select an intermediate operation position or directly move the current operation position to the target operation position without selecting an intermediate operation position in the optimal operation region; send control signals configured to transition the electric drive motor from the current operation position to the target operation position in the operational model; and amend the operational model by adjusting at least one of the current speed parameter and the current torque parameter by moving the current operation position to the target operation position along via an intermediate operation position. - View Dependent Claims (8, 9, 10, 11)
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Specification