US 7,024,290 B2 · Active motor damping to mitigate electric vehicle driveline oscillations

Abstract

A system and method for actively damping driveline oscillations in a motor vehicle having a traction motor to drive a vehicle's drive wheels and an antilock brake system (ABS). A traction motor controller controls a torque output signal of the motor to effectively to dampen driveline oscillations during an ABS operation. A proportional, a proportional derivative, or a derivative controller may be used to generate the torque output signal based on at least one of motor speed, an average of the drive wheel speeds, a difference in the two speeds, a motor angular acceleration, an average wheel angular acceleration, and a difference in the angular accelerations. Motor speed signals and average drive wheel speed signals may be filtered to eliminate high frequency components of each speed signal. Additionally, amplitude of the torque output signal may be limited within a positive upper and a negative lower active motor damping limit.

Claims18

Dependent claims

A method for actively dampening driveline oscillations comprising a motor torque output driven by an electric machine in a motor vehicle having an antilock brake system comprising the steps of:

providing a motor torque output during a drive operation via the electric machine to drive at least two drive wheels on a motor vehicle;
and
continuously controlling the motor torque output via a motor torque signal to effectively dampen driveline oscillations comprising the motor torque output during an antilock brake system operation that occurs when the antilock brake system is active at at least one of the at least two drive wheels.

A method for actively dampening driveline oscillations comprising a traction motor in a motor vehicle having an antilock brake system, comprising the steps of:

providing a torque output during drive operation via the traction motor that drives at least two drive wheels on a motor vehicle;
using at least one of a proportional controller, a proportional derivative controller, and a derivative controller to control the torque output via a torque output signal to effectively dampen driveline oscillations comprising the traction motor torque output during an antilock brake system operation that occurs when the antilock brake system is active at at least one of the at least two drive wheels.

Dependencies are inferred from the claim text.

Active motor damping to mitigate electric vehicle driveline oscillations

Life of this patent

Active motor damping to mitigate electric vehicle driveline oscillations

Life of this patent

Abstract

Claims18