System and method for controlling a steering reaction force imposed on a steering wheel
First Claim
1. A system for controlling a steering reaction force for a vehicle, comprising:
- (a) first means for estimating at least motion state variable of the vehicle, when a steering wheel of the vehicle is operated, on the basis of a vehicle model representing a mathematical model of the vehicle having a desired motion performance;
(b) second means for determining a target value of the steering reaction force imposed on a steering wheel on the basis of an estimation value of the motion state variable estimated by the first means; and
(c) third means for generating the steering reaction force imposed on the steering wheel which is substantially equal to the target value of the steering reaction force of the steering wheel determined by the second means.
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Accused Products
Abstract
A system and method for controlling a steering reaction force in which at least one of motion state variables of a vehicle is estimated when a steering wheel of the vehicle is operated on the basis of a vehicle model which represents a mathematical model of the vehicle having a desired performance of motion, a target value of the steering reaction force imposed on a steering wheel is determined on the basis of the estimated value of the motion state variable, and the steering reaction force imposed on the steering wheel is generated so as to become substantially equal to the target value. The steering reaction force control system achieves the generation of the steering reaction force on the steering wheel on the basis of a vehicle turning motion information as motion state variables such as a lateral acceleration of the vehicle and/or yaw rate of the vehicle.
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Citations
18 Claims
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1. A system for controlling a steering reaction force for a vehicle, comprising:
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(a) first means for estimating at least motion state variable of the vehicle, when a steering wheel of the vehicle is operated, on the basis of a vehicle model representing a mathematical model of the vehicle having a desired motion performance; (b) second means for determining a target value of the steering reaction force imposed on a steering wheel on the basis of an estimation value of the motion state variable estimated by the first means; and (c) third means for generating the steering reaction force imposed on the steering wheel which is substantially equal to the target value of the steering reaction force of the steering wheel determined by the second means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for controlling a steering reaction force, comprising the steps of:
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(a) setting a vehicle model representing a mathematical model of a vehicle having a desired performance of motion; (b) estimating at least one motion state variable of the vehicle on the basis of the vehicle model set in the step (a); (c) determining a target value of the steering reaction force imposed on a steering wheel on the basis of an estimation value of the motion state variable estimated in the step (b); and (d) generating a steering reaction force imposed on the steering wheel so as to become substantially equal to the target value of the steering reaction force of the steering wheel determined in the step (c). - View Dependent Claims (14, 15, 16)
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17. A system, comprising:
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a vehicle having a wheels and a steering wheel for determining a driving angle to be assumed by said wheels; means for determining a steering angle of said steering wheel; means for determining an estimated value of at least one motion state variable of said vehicle based on said steering angle; means for determining an appropriate steering reaction force based on said estimated value of said state variable; and power assist means for providing a power assist to said steering wheel to aid in moving said wheels to said driving angle, said power assist means being response to said steering reaction force determining means for making an actual steering reaction force at said steering wheel substantially equal to said estimated value when said wheels are at said driving angle determined by said steering wheel.
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18. A method, comprising:
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determining a driving angle of wheels of a vehicle based on a steering angle of a steering wheel; determining an estimated value of at least one motion state variable of said vehicle based on said steering angle; determining an appropriate steering reaction force based on said estimated value of said state variable; and providing a power assist to said steering wheel to aid in moving said wheels to said driving angle and modifying said power assist in response to said steering reaction force determining means to make an actual steering reaction force at said steering wheel substantially equal to said estimated value when said wheels are at said driving angle determined by said steering wheel.
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Specification