Method for controlling operating speed and torque of electric motor
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H02P-001/00
H02P-023/00
H02P-006/08
B60L-011/18
B60L-015/20
B60W-010/08
H02P-031/00
H02P-007/285
출원번호
US-0826217
(2015-08-14)
등록번호
US-9866163
(2018-01-09)
발명자
/ 주소
Lai, Sheng-Fu
출원인 / 주소
THUNDER POWER NEW ENERGY VEHICLE DEVELOPMENT COMPANY LIMITED
대리인 / 주소
Kilpatrick Townsend & Stockton LLP
인용정보
피인용 횟수 :
0인용 특허 :
20
초록▼
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 pas
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.
대표청구항▼
1. A method for controlling an operating speed and 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 corres
1. A method for controlling an operating speed and 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; andif the current operation position is not located in the predetermined optimal operation region: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 an intermediate operation position corresponding to an intermediate speed parameter and an intermediate torque parameter and located in the optimal operation region; andin response to the current speed parameter and the current torque parameter having been adjusted to the intermediate speed parameter and the 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. 2. The method of claim 1, further comprising: Selecting, by the CPU, an optimal intermediate operation position in the optimal operation region as the intermediate operation position. 3. The method of claim 2, wherein: the optimal intermediate operation position is selected as a position having a shortest linear distance from the optimal operation region to the current operation position in the operational model. 4. The method of claim 1, wherein: at least one of the current operation position is moved to the intermediate operation position and the intermediate operation position is moved to the target operation position by changing a driving voltage and a driving current applied to the electric motor. 5. The method of claim 1, further comprising: amending, by the CPU, an efficiency parameter on a selected position in the operational model according to a calculated efficiency parameter on the target operation position. 6. The method of claim 5, wherein: amending, by the CPU, the efficiency parameter on a selected position in the operational model according to the calculated efficiency parameter on the target operation position comprises: detecting, by the CPU, the input voltage and current of the motor at the target operation position;calculating, by the CPU, an actual operating efficiency of the motor at the target operation position according to the torque and the speed of the motor at the target operation position and the detected input voltage and current at the target operation position;calculating, by the CPU, a correction coefficient according to the operating efficiency corresponding to the target operation position in the operational model and the calculated actual operation efficiency of the motor at the target operation position;selecting, by the CPU, at least one position to be corrected close to the target operation position;calculating, by the CPU, the distance between the target operation position and the position to be corrected;calculating, by the CPU, a correction quantity according to the calculated correction coefficient calculated and the calculated distance;correcting, by the CPU, the position of the position to be corrected in the operational model according to the correction quantity. 7. 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; andin 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; andin 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. 8. An electric vehicle comprising: an electric drive motor;a battery configured to power the electric drive motor; andan 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; andsend control signals configured to transition the electric drive motor from the current operation position to the target operation position in the operational model. 9. The vehicle of claim 8, wherein the processor is further configured to: in response to determining the intermediate operation position in the optimal operation region is to be selected: adjust 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; andin 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 adjust the current speed parameter and the current torque parameter to move the current operation position to the target operation position along a second path. 10. The vehicle of claim 9, wherein the processor is further configured to: select an optimal intermediate operation position in the optimal operation region as the intermediate operation position, wherein the optimal intermediate operation position is selected as a position having a shortest linear distance from the optimal operation region to the current operation position. 11. The vehicle of claim 8, wherein the control signals are configured to transition the electric drive motor from the current operation position to the target operation position on the operational model by changing at least one of the driving voltage and the driving current applied to the electric motor such that the current operation position at any time during the transition to the target operation position is on a transition path in the operational model. 12. The vehicle of claim 8, wherein the processor is further configured to: amend an efficiency parameter on a selected position in the operational model according to a calculated efficiency parameter on the target operation position. 13. The vehicle of claim 12, wherein: amending the efficiency parameter on a selected position in the operational model according to the calculated efficiency parameter on the target operation position comprises:detecting the input voltage and current of the motor at the target operation position;calculating the actual operating efficiency of the motor at the target operation position according to the torque and the speed of the motor at the target operation position and the detected input voltage and current at the target operation position;calculating a correction coefficient according to the operating efficiency corresponding to the target operation position in the operational model and the calculated actual operation efficiency of the motor at the target operation position;selecting at least one position to be corrected close to the target operation position;calculating the distance between the target operation position and the position to be corrected;calculating a correction quantity according to the calculated correction coefficient calculated and the calculated distance;correcting the position of the position to be corrected in the operational model according to the correction quantity.
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