Quadrant dependent active damping for electric power steering
First Claim
1. An electric power steering system including:
- a steering wheel,an electric assist motor operatively coupled to the steering wheel, andan electronic controller operatively coupled to the assist motor for receiving a first signal representative of torque applied to the steering wheel, and a second signal representative of angular velocity of the assist motor;
the electronic controller producing an active damping motor command signal as a function of the first and second signals;
wherein the active damping motor command signal is scaled by a first scaling factor if the first and second signals are both positive, or if the first and second signals are both negative, to provide a scaled motor command signal;
wherein the active damping motor command signal is scaled by a second scaling factor if the first signal is positive and the second signal is negative, or if the first signal is negative and the second signal is positive, to provide the scaled motor command signal.
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0 Petitions
Accused Products
Abstract
An electric power steering system includes a steering wheel, an electric assist motor operatively coupled to the steering wheel, and an electronic controller operatively coupled to the motor for receiving a first signal representative of torque applied to the steering wheel, and a second signal representative of angular velocity of the motor. The electronic controller produces an active damping motor command signal according to a function of the first and second signals. The active damping motor command signal is scaled by a first factor if the first and second signals are both positive, or if the first and second signals are both negative, to provide a scaled motor command signal. The active damping motor command signal is scaled by a second factor if the first signal is positive and the second signal is negative, or if the first signal is negative and the second signal is positive, to provide the scaled motor command signal. The scaled motor command signal is applied to the motor.
210 Citations
20 Claims
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1. An electric power steering system including:
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a steering wheel, an electric assist motor operatively coupled to the steering wheel, and an electronic controller operatively coupled to the assist motor for receiving a first signal representative of torque applied to the steering wheel, and a second signal representative of angular velocity of the assist motor;
the electronic controller producing an active damping motor command signal as a function of the first and second signals;wherein the active damping motor command signal is scaled by a first scaling factor if the first and second signals are both positive, or if the first and second signals are both negative, to provide a scaled motor command signal; wherein the active damping motor command signal is scaled by a second scaling factor if the first signal is positive and the second signal is negative, or if the first signal is negative and the second signal is positive, to provide the scaled motor command signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 18, 19, 20)
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11. A method for controlling an electric power steering system comprising a steering wheel, an electric assist motor operatively coupled to the steering wheel, and an electronic controller operatively coupled to the assist motor, the method including:
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receiving a first signal representative of torque applied to the steering wheel, receiving a second signal representative of angular velocity of the assist motor, producing an active damping motor command signal as a function of the first and second signals, scaling the active damping motor command signal by a first scaling factor if the first and second signals are both positive, or if the first and second signals are both negative, to provide a scaled motor command signal; scaling the active damping motor command signal by a second scaling factor if the first signal is positive and the second signal is negative, or if the first signal is negative and the second signal is positive, to provide the scaled motor command signal. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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Specification