Vehicle steering control system with derivative gain adjusting capability
First Claim
1. A steering control system for a vehicle, comprising:
- actuating means for varying an actual first wheel steer angle of the vehicle in response to a control signal representing a desired first wheel steer angle;
sensing means for sensing a driver'"'"'s steering operation and producing a steering input signal representing a steering input; and
controlling means for producing said control signal in accordance with said steering input signal, said controlling means comprising basic control means for determining said desired first wheel steer angle in accordance with a product resulting from multiplication of a derivative gain and a predetermined order derivative of said steering input with respect to time, and derivative gain adjusting means for decreasing said derivative gain when the time rate of change of said steering input is smaller than a predetermined reference value.
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Accused Products
Abstract
A steering control system for controlling either or both of the front and rear wheel steer angles of a vehicle includes a steering input sensor for sensing a steering input such as a steering wheel angle and an electronic control unit which includes a basic control section for calculating a desired steer angle in accordance with the sensed steering input and a time derivative of the steering input. In order to improve the vehicle stability by eliminating unstable vehicle response to driver'"'"'s unconscious fluctuating steering operation, the control unit further includes a gain adjusting section for discriminating unconscious operation from intentional steering operation by comparing the time rate of change of the steering input with a predetermined reference level, and for decreasing the gain by which the derivative of the steering input is multiplied in determining the desired steer angle when the time rate of change of the steering input is smaller than the reference level.
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Citations
9 Claims
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1. A steering control system for a vehicle, comprising:
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actuating means for varying an actual first wheel steer angle of the vehicle in response to a control signal representing a desired first wheel steer angle; sensing means for sensing a driver'"'"'s steering operation and producing a steering input signal representing a steering input; and controlling means for producing said control signal in accordance with said steering input signal, said controlling means comprising basic control means for determining said desired first wheel steer angle in accordance with a product resulting from multiplication of a derivative gain and a predetermined order derivative of said steering input with respect to time, and derivative gain adjusting means for decreasing said derivative gain when the time rate of change of said steering input is smaller than a predetermined reference value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification