Wheel speed velocity variation scaling system
First Claim
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1. A control system for a power steering system, comprising:
- a scaling module for calculating a scale factor based on a wheel frequency; and
a command module that evaluates a wheel disturbance based on a wheel speed sensed by a wheel speed sensor and determines a wheel disturbance cancel amount based on the wheel speed, the command module further generates an assist command output to control the power steering system, the assist command is based on the wheel disturbance cancel amount and the scale factor, the scaling module further determines the scale factor based on a current magnitude, the current magnitude being based on a filtered wheel speed.
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Abstract
A control system for a power steering system is provided. The control system includes a scaling module for calculating a scale factor based on a wheel frequency. The control system also includes a command module that evaluates a wheel disturbance based on a wheel speed and that determines a wheel disturbance cancel amount based on the wheel speed. The command module generates an assist command to the power steering system based on the wheel disturbance cancel amount and the scale factor.
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Citations
17 Claims
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1. A control system for a power steering system, comprising:
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a scaling module for calculating a scale factor based on a wheel frequency; and a command module that evaluates a wheel disturbance based on a wheel speed sensed by a wheel speed sensor and determines a wheel disturbance cancel amount based on the wheel speed, the command module further generates an assist command output to control the power steering system, the assist command is based on the wheel disturbance cancel amount and the scale factor, the scaling module further determines the scale factor based on a current magnitude, the current magnitude being based on a filtered wheel speed. - View Dependent Claims (2, 3, 4, 5, 10, 12, 13)
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6. A control system for a power steering system, comprising:
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a scaling module for calculating a scale factor based on a wheel frequency; and a command module that evaluates a wheel disturbance based on a wheel speed sensed by a wheel sensor and determines a wheel disturbance cancel amount based on the wheel speed, the command module further generates an assist command output to control the power steering system, the assist command is based on the wheel disturbance cancel amount and the scale factor and wherein the scaling module further determines the scale factor based on a current magnitude, wherein the current magnitude is based on a filtered wheel speed, the current magnitude being sent to a rate limiter and compared to an auto scale target value, wherein the auto scale target value represents a maximum allowed variation in the wheel speed. - View Dependent Claims (7, 8, 9)
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11. A control system for a power steering system, comprising:
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a scaling module for calculating a scale factor based on a wheel frequency; and a command module that evaluates a wheel disturbance based on a wheel speed sensed by a wheel speed sensor and determines a wheel disturbance cancel amount based on the wheel speed, the command module further generates an assist command output to control the power steering system, the assist command is based on the wheel disturbance cancel amount and the scale factor, the scale factor being based on an angular velocity (VAV) amplitude and an auto scale target value, wherein the auto scale target value is divided by the VAV amplitude, wherein the auto scale target value represents an allowed variation in the wheel speed.
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14. A control system for a power steering system, comprising:
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a frequency estimation module for calculating a wheel frequency based on a wheel speed sensed by a wheel speed sensor; a scaling module for calculating a scale factor based on the wheel frequency; a command module that evaluates a wheel disturbance based on the wheel speed sensed by the wheel speed sensor and determines a wheel disturbance cancel amount based on the wheel speed, the command module generates an assist command output to control the power steering system, the assist command is based on the wheel disturbance cancel amount and the scale factor, the scaling module determining the scale factor based on a current magnitude, the current magnitude is based on a filtered wheel speed, the current magnitude is sent to a rate limiter and compared to an auto scale target value, the auto scale target value represents an allowed variation in the wheel speed. - View Dependent Claims (15, 16, 17)
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Specification