Steering control apparatus for vehicle
First Claim
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1. A steering control apparatus for a vehicle, comprising:
- (A) a transmission ratio varying mechanism capable of varying the amount of angular rotation of an output shaft relative to the amount of angular rotation of an input shaft connected to a steering handle, said mechanism including an actuator for driving said mechanism by applying a torque thereto; and
(B) a steering control device that controls transmission ratio by driving said actuator, said device determining a force applied to said steering handle and controlling the torque of said actuator based on the force applied to said steering handle.
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Abstract
A hand-off state determination section 73 estimates torque Th exerted on the steering handle by a driver. When the steering handle is in the hand-off state in which the torque is small, switching is effected to the side of compensator 75 having smaller gains set, so as to stabilize a steering control system.
34 Citations
8 Claims
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1. A steering control apparatus for a vehicle, comprising:
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(A) a transmission ratio varying mechanism capable of varying the amount of angular rotation of an output shaft relative to the amount of angular rotation of an input shaft connected to a steering handle, said mechanism including an actuator for driving said mechanism by applying a torque thereto; and
(B) a steering control device that controls transmission ratio by driving said actuator, said device determining a force applied to said steering handle and controlling the torque of said actuator based on the force applied to said steering handle. - View Dependent Claims (2, 3, 4)
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5. A steering control apparatus for a vehicle comprising:
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(A) a transmission ratio varying mechanism capable of varying the amount of angular rotation of an output shaft relative to the amount of angular rotation of an input shaft connected to a steering handle, said mechanism including an actuator for driving said mechanism by applying a torque thereto; and
(B) a steering control device that controls transmission ratio by driving said actuator, said device controlling the torque of said actuator based on a force applied to said steering handle;
wherein said device sets the amount of torque supplied when said force is less than a predetermined value to an amount that is less than the amount of torque supplied when said force is larger than said predetermined value. - View Dependent Claims (6)
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7. A steering control apparatus for vehicle comprising a transmission ratio varying mechanism for varying a transmission ratio between a steering angle of a steering handle and a turn angle of a wheel by driving force of an actuator, said steering control apparatus comprising:
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steering angle detecting means for detecting the steering angle of the steering handle;
turn angle detecting means for detecting the turn angle of the wheel;
target turn angle setting means for setting a target turn angle of the wheel according to the steering angle, based on a transmission ratio set according to a running condition of a vehicle;
first control means for controlling a torque produced by said actuator, according to a deviation between said target turn angle and the turn angle detected by said turn angle detecting means; and
second control means for controlling the magnitude of the torque produced by said actuator with respect to said deviation to a smaller value than that by said first control means when it is determined that an operator keeps the hands off said steering handle. - View Dependent Claims (8)
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Specification