System and method for operating an electric motor by limiting performance
AssigneeFord Global Technologies, LLC
InventorDavid Mack
Life of this patent
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Abstract
A method and system for limiting motor performance in a hybrid electric vehicle system. During a condition in a primary drivetrain, the method limits performance of an electric motor used in an auxiliary drivetrain to control energy consumed from a battery in the auxiliary drivetrain. A calculation or measurement is made to determine available battery energy remaining in the battery after the condition. The performance of the electric motor is then limited based on the available battery energy.
Claims21
A method for use in an electrically driven vehicle having a primary drivetrain and an auxiliary drivetrain, the auxiliary drivetrain being an electric only drivetrain having capabilities to power an electric motor used to drive the vehicle with energy from a limited supply of stored energy, the method comprising:
- controlling a driving characteristic of the auxiliary drive train based on a first performance limiting strategy, the first performance limiting strategy based in part on future availability of the primary drivetrain;
- and
- switching control of the driving characteristic to a second performance limiting strategy associated with future unavailability of the primary drivetrain, the second performance limiting strategy associated with controlling power consumption of the electric motor in such a manner as to limit consumption of the stored energy for all motor power demands and not only motor power demands associated with particular vehicle speeds.
A method of limiting power consumption of an electric motor used to drive a vehicle when a fuel supplied primary power source is unavailable to power the motor, the method comprising:
- powering the motor with energy from an electric only auxiliary powertrain, the electric only auxiliary powertrain having capabilities to power the electric motor with energy from a limited supply of stored energy;
- and
- limiting power consumption of the electric motor in such as manner as to limit consumption of the stored energy as a function of motor power demands determined as a function of vehicle speed, load, and acceleration.
A vehicle controller configured for:
- controlling a driving characteristic of an auxiliary drivetrain based on a first performance limiting strategy, the first performance limiting strategy based in part on future availability of the primary drivetrain;
- and
- switching control of the driving characteristic to a second performance limiting strategy associated with future unavailability of the primary drivetrain, the second performance limiting strategy associated with controlling power consumption of an electric motor in such a manner as to limit consumption of stored energy for all motor power demands and not only motor power demands associated with particular vehicle speeds.
Dependencies are inferred from the claim text.