Control strategy for an electric motor using real time predictions of motor capability based on thermal modeling and measurements
First Claim
1. A system for controlling an electric motor in a motor vehicle,comprising:
- at least one controller for receiving and processing a plurality of system input signals;
a first strategy embodied within the at least one controller for determining a maximum energy amount that can be put into the motor before the temperature of the motor is caused to rise to a maximum allowable temperature;
a second strategy embodied within the at least one controller for determining a motor power assist value that the motor can provide in a predetermined time period before the motor reaches said maximum allowable temperature; and
means for outputting said motor power assist value to a vehicle system controller.
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Accused Products
Abstract
A system and method for controlling an electric motor using real time predictions of motor capability based on thermal modeling and measurements is provided. The invention includes controllers for receiving and processing system input signals, strategies for: determining a maximum energy amount that can be put into the motor before the motor reaches a maximum allowable temperature; determining a motor power assist value that the motor can provide in a predetermined period of time before the motor reaches the maximum allowable temperature; determining a battery power assist value; determining a maximum power assist value that is the minimum of the motor power assist value and the battery power assist value; and comparing the maximum power assist value to a driver demand signal. Strategy outputs can be sent to a vehicle system controller and/or a power assist gauge.
33 Citations
30 Claims
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1. A system for controlling an electric motor in a motor vehicle,comprising:
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at least one controller for receiving and processing a plurality of system input signals;
a first strategy embodied within the at least one controller for determining a maximum energy amount that can be put into the motor before the temperature of the motor is caused to rise to a maximum allowable temperature;
a second strategy embodied within the at least one controller for determining a motor power assist value that the motor can provide in a predetermined time period before the motor reaches said maximum allowable temperature; and
means for outputting said motor power assist value to a vehicle system controller. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for controlling an electric motor in an hybrid electric vehicle, comprising the steps of:
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monitoring and processing a plurality of system input signals;
determining a maximum energy amount that can be put into the motor before the temperature of the motor rises to a maximum allowable temperature; and
determining a motor power assist value that the motor can provide in a predetermined period of time before the motor temperature rises to said maximum allowable temperature. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. An article of manufacture, comprising:
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a computer readable storage device; and
a plurality of strategies in computer readable format embodied in said computer readable storage device for directing a computer to control the steps of monitoring and processing a plurality of system input signals, said strategies comprising a determination of a maximum energy amount that can be put into an electric motor before the temperature of the motor rises to a maximum allowable temperature, a determination of a motor power assist value that the motor can provide in a predetermined period of time before the motor reaches said maximum allowable temperature, determining a battery power assist value, a determination of a maximum power assist value that is the minimum of said motor power assist value and said battery power assist value, comparing said maximum power assist value to a driver demand signal, and an output of a minimum of said maximum power assist value and said driver demand signal to a vehicle system controller.
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30. A vehicle, comprising:
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a computer readable storage device; and
a plurality of strategies in computer readable format embodied in said computer readable storage device for directing a computer to control the steps of monitoring and processing a plurality of system input signals, said strategies comprising a determination of a maximum energy amount that can be put into an electric motor before the temperature of the motor rises to a maximum allowable temperature, a determination of a motor power assist value the motor can provide in a predetermined period of time before the motor temperature reaches said maximum allowable temperature, determining a battery power assist value, a determination of a maximum power assist value that is the minimum of said motor power assist value and said battery power assist value, comparing said maximum power assist value to a driver demand signal, and an output of a minimum of said maximum power assist value and said driver demand signal to a vehicle system controller.
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Specification