Vehicle steering control system
First Claim
1. A steering control system for a vehicle, comprising:
- steering input means;
a steering mechanism for steering steerable wheels;
a powered actuator for actuating said steering mechanism according to a steering input signal from said steering input means;
means for evaluating a response of said vehicle to said steering input signal; and
compensation means interposed between said steering input means and said powered actuator for modifying said steering input signal based on an output of said evaluating means so that a desired vehicle response to said steering input signal will be obtained by the steering control system.
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Abstract
In a "steer-by-wire" vehicle steering control system which steers steerable wheels with a powered actuator according to an input signal obtained from a sensor associated with a steering wheel, to the end of achieving an optimum vehicle response to a steering input, a compensatory transfer function is introduced between the steering wheel and the powered steering actuator. The compensatory transfer function can be obtained by suitable manipulation of the transfer functions of the hardware involved and a desired overall transfer function. The frequency domain compensatory transfer function is transformed into a time-domain input-output relationship, and the steering mechanism is actuated accordingly as a real time operation. By suitable selection of the desired overall transfer function, it is possible to achieve a vehicle response both stable and favorable.
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Citations
15 Claims
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1. A steering control system for a vehicle, comprising:
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steering input means; a steering mechanism for steering steerable wheels; a powered actuator for actuating said steering mechanism according to a steering input signal from said steering input means; means for evaluating a response of said vehicle to said steering input signal; and compensation means interposed between said steering input means and said powered actuator for modifying said steering input signal based on an output of said evaluating means so that a desired vehicle response to said steering input signal will be obtained by the steering control system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A steering control system for a vehicle, comprising:
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steering input means; a steering mechanism for steering steerable wheels; a powered actuator for actuating said steering mechanism according to a steering input signal from said steering input means; means for evaluating a response of said vehicle to said steering input signal; and compensation means interposed between said steering input means and said powered actuator for modifying said steering input signal based on an output of said evaluating means, said compensation means having a transfer function
space="preserve" listing-type="equation">G.sub.C (s)=f(s)/G.sub.r (s)G.sub.A (s)where f.sub.(s) is a desired transfer function of a dynamic vehicle response to a steering input signal from said steering input means, Gr (s) is a transfer function of said dynamic vehicle response to a steering input from said steerable wheels, and GA (s) is a transfer function of an output of said powered actuator to said steering input signal from said steering input means. - View Dependent Claims (14, 15)
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Specification