STEERING CONTROL METHOD AND SYSTEM FOR REAR-WHEEL STEERING
First Claim
1. A steering control method for rear-wheel steering, the method comprising:
- a calculation step in which a controller receives a vehicle speed and a front-wheel turning angle and calculates a rear-wheel same/inverse-phase control amount;
an estimation step in which the controller estimates tire slip angles on the basis of factors showing a driving state of a vehicle when the vehicle is driven such that the rear wheels are controlled with the same phase;
a compensation step in which the controller calculates a final rear-wheel turn control value by reflecting a control weight proportioned to the tire slip angle estimation value to the rear-wheel same-phase control amount; and
a rear-wheel control step in which the controller turns the rear wheels by controlling a rear-wheel turn actuator on the basis of the final rear-wheel turn control value.
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Accused Products
Abstract
The present disclosure provides a steering control method and system for rear-wheel steering that improves driving stability and yaw responsiveness of a vehicle by controlling rear wheels on the basis of a driving state of a vehicle. The method and system receives a vehicle speed and a front-wheel turning angle and calculates a rear-wheel same/inverse-phase control amount; estimates tire slip angles when the vehicle is driven such that the rear wheels are controlled with the same phase; calculates a final rear-wheel turn control value by reflecting a control weight proportioned to the tire slip angle estimation value to the rear-wheel same-phase control amount; and turns the rear wheels on the basis of the final rear-wheel turn control value.
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Citations
8 Claims
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1. A steering control method for rear-wheel steering, the method comprising:
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a calculation step in which a controller receives a vehicle speed and a front-wheel turning angle and calculates a rear-wheel same/inverse-phase control amount; an estimation step in which the controller estimates tire slip angles on the basis of factors showing a driving state of a vehicle when the vehicle is driven such that the rear wheels are controlled with the same phase; a compensation step in which the controller calculates a final rear-wheel turn control value by reflecting a control weight proportioned to the tire slip angle estimation value to the rear-wheel same-phase control amount; and a rear-wheel control step in which the controller turns the rear wheels by controlling a rear-wheel turn actuator on the basis of the final rear-wheel turn control value. - View Dependent Claims (2, 3, 4)
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5. A steering control method for rear-wheel steering, the method comprising:
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a calculation step in which a controller receives a vehicle speed and a front-wheel turning angle and calculates a rear-wheel same/inverse-phase control amount; an estimation step in which the controller estimates tire slip angles on the basis of factors showing a driving state of a vehicle; a compensation step in which the controller calculates a final rear-wheel turn control value by reflecting a control weight proportioned to a tire slip angle estimation value to the rear-wheel same-phase control amount; and a rear-wheel control step in which the controller turns the rear wheels by controlling a rear-wheel turn actuator on the basis of the final rear-wheel turn control value.
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6. A steering control system for rear-wheel steering, the system comprising:
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a same/inverse-phase control amount calculator that receives a vehicle speed and a front-wheel turning angle and calculates a rear-wheel same/inverse-phase control amount; a vehicle state estimator that estimates tire slip angles on the basis of factors showing a driving state of a vehicle when the vehicle is driven such that the rear wheels are controlled with the same phase; and a rear-wheel turn controller that calculates a final rear-wheel turn control value by reflecting a control weight proportioned to a tire slip angle estimation value to the rear-wheel same-phase control amount and turns the rear wheels by controlling a rear-wheel turn actuator on the basis of the final rear-wheel turn control value. - View Dependent Claims (7, 8)
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Specification