Control system and method for mitigating driveline torque spikes in electric vehicles
AssigneeGM Global Technology Operations LLC
InventorShaochun Ye
Life of this patent
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Abstract
A control system and method for mitigating driveline torque spikes in an electric vehicle is contemplated. The driveline torque spikes may be mitigated with a motor spike torque command generated in response to a wheel acceleration of a wheel of the vehicle exceeding a spike threshold. The motor spike torque command may be configured for controlling an electric motor of the vehicle to mitigate the driveline torque spike in a driveline configured to connect the motor to the wheel.
Claims20
A control system for an electric vehicle, the system comprising:
- a motor controller configured to control a motor of the vehicle according to one or more of a plurality of torque commands;
- and
- a motor spike controller configured to generate a motor spike torque command as one of the plurality of torque commands, the motor spike torque command being configured to mitigate driveline torque spikes in a driveline configured to connect the motor to a wheel of the vehicle;
- wherein the motor spike controller is configured to generate the motor spike torque command according to a torque spike equation, the torque spike equation being represented as:
- Tm=Jm×{dot over (N)}w×Ratio
- wherein Tm is the motor spike torque command, Jm is a motor inertia of the motor, {dot over (N)}w is a wheel acceleration of the wheel, and Ratio is a constant representing a speed ratio between the motor and the wheel.
A control method for mitigating driveline torque spikes in an electric vehicle, the method comprising:
- generating a motor spike torque command in response to a wheel acceleration of a wheel of the vehicle exceeding a spike threshold, the motor spike torque command being configured for controlling an electric motor of the vehicle to mitigate the driveline torque spike in a driveline configured to connect the motor to the wheel;
- and
- generating the motor spike torque command according to a torque spike equation, the torque spike equation being represented as:
- Tm=Jm×{dot over (N)}w×Ratio
- wherein Tm is the motor spike torque command, Jm is a motor inertia of the motor, {dot over (N)}w is the wheel acceleration, Ratio is a constant representing a speed ratio between the motor and the wheel.
A control system for an electric vehicle, the system comprising:
- a wheel slip controller configured to control wheel slip based on a wheel speed measured at a wheel of the vehicle;
- a wheel flare controller configured to control wheel flare based on a transmission output speed of an output of a transmission included as part of a driveline of the vehicle;
- and
- a motor spike controller configured to control driveline torque spikes based on a wheel acceleration of the wheel and a motor inertia of a motor connected via the driveline to the wheel;
- wherein the motor spike controller is configured to generate a motor spike torque command for controlling the motor to mitigate the driveline torque spike;
- and
- wherein the motor spike controller is configured to generate the motor spike torque command according to a torque spike equation, the torque spike equation being represented as:
- Tm=Jm×{dot over (N)}w×Ratio
- wherein Tm is the motor spike torque command, Jm is a motor inertia of the motor, {dot over (N)}w is the wheel acceleration, and Ratio is a constant representing a speed ratio between the motor and the wheel.
Dependencies are inferred from the claim text.