Increased motor torque capability through time-based thermal derating
AssigneeGM Global Technology Operations LLC
InventorsMichael Mayberry, Brent Steven Gagas, Daniel J. Berry
Life of this patent
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Abstract
A vehicle includes a system that performs a method of derating a motor of the vehicle. The system includes a timer and a processor. The processor is configured to start the timer when a temperature of a stator of the motor exceeds a high temperature threshold, select a blend ratio based on a time value on the timer, determine, using the blend ratio, an intermediate derating curve for the motor by interpolating between a first derating curve associated with a first target temperature and a second derating curve associated with a second target temperature greater than the first target temperature, and derate the motor along the intermediate derating curve.
Claims20
A method of derating a motor of a vehicle, comprising:
- starting a timer when a temperature of a stator of the motor exceeds a high temperature threshold;
- selecting a blend ratio based on a time value on the timer;
- determining, using the blend ratio, an intermediate derating curve for the motor by interpolating between a first derating curve associated with a first target temperature and a second derating curve associated with a second target temperature greater than the first target temperature;
- and
- derating the motor along the intermediate derating curve.
A system for derating a motor of a vehicle, comprising:
- a timer;
- a processor configured to:
- start the timer when a temperature of a stator of the motor exceeds a high temperature threshold;
- select a blend ratio based on a time value on the timer;
- determine, using the blend ratio, an intermediate derating curve for the motor by interpolating between a first derating curve associated with a first target temperature and a second derating curve associated with a second target temperature greater than the first target temperature;
- and
- derate the motor along the intermediate derating curve.
A vehicle, comprising:
- a timer;
- a processor configured to:
- start the timer when a temperature of a stator of a motor exceeds a high temperature threshold;
- select a blend ratio based on a time value on the timer;
- determine, using the blend ratio, an intermediate derating curve for the motor by interpolating between a first derating curve associated with a first target temperature and a second derating curve associated with a second target temperature greater than the first target temperature;
- and
- derate the motor along the intermediate derating curve.
Dependencies are inferred from the claim text.