Systems and methods for managing torque capability in electric motor systems
First Claim
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1. A method for operating an electric motor, comprising the steps of:
- receiving a torque request in an electronic control system;
determining, in the electronic control system, long term torque capabilities and short term torque capabilities of the electric motor;
generating, in the electronic control system, a torque command based on the torque request and at least one of the long term torque capabilities or the short term torque capabilities;
controlling the electric motor in accordance with the torque command; and
calculating temperature reduction factors,wherein the determining step includes selecting nominal short term torque capabilities and limiting the nominal short term torque capabilities based on the temperature reduction factors, andwherein the determining step includes selecting nominal long term torque capabilities and limiting the nominal long term torque capabilities based on the temperature reduction factors.
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Abstract
A method for operating an electric motor is provided. The method includes receiving a torque request; determining long term torque capabilities and short term torque capabilities of the electric motor; generating a torque command based on the torque request and at least one of the long term torque capabilities or the short term torque capabilities; and controlling the electric motor in accordance with the torque command.
14 Citations
19 Claims
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1. A method for operating an electric motor, comprising the steps of:
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receiving a torque request in an electronic control system; determining, in the electronic control system, long term torque capabilities and short term torque capabilities of the electric motor; generating, in the electronic control system, a torque command based on the torque request and at least one of the long term torque capabilities or the short term torque capabilities; controlling the electric motor in accordance with the torque command; and calculating temperature reduction factors, wherein the determining step includes selecting nominal short term torque capabilities and limiting the nominal short term torque capabilities based on the temperature reduction factors, and wherein the determining step includes selecting nominal long term torque capabilities and limiting the nominal long term torque capabilities based on the temperature reduction factors. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 17, 18, 19)
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9. An electronic control system configured to operate an electric motor, comprising:
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a torque controller configured to determine long term torque capabilities and short term torque capabilities associated with the electric motor; a vehicle controller coupled to the torque controller and configured to receive a torque request and to generate a torque command based on the torque request and at least one of the long term torque capabilities or the short term torque capabilities; and an inverter module coupled to the vehicle controller and configured to receive the torque command and to drive the electric motor according to the torque command, wherein the short term torque capabilities received by the vehicle controller are modified short term torque capabilities and the long term torque capabilities received by the vehicle controller are modified long term torque capabilities, and wherein the torque controller is configured to select nominal short term torque capabilities and nominal long term torque capabilities, calculate at least one of temperature reduction factors or cooling system reduction factors, and limit the nominal short term torque capabilities and the nominal long term torque capabilities based on the at least one of temperature reduction factors or cooling system reduction factors to produce the modified short term torque capabilities and the modified long term torque capabilities. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification