STEERING CONTROL DEVICE
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Accused Products
Abstract
A steering control device suppresses response delay to stabilize a behavior of a vehicle during turning braking. The steering control device includes a steer-by-wire system that controls an actuator that detects displacement of a steering angle when a steering wheel is steered and operates a turning mechanism that turns a turning wheel separated from the steering wheel based on a detection result; a vehicle yaw angle detector; a steering angle detector; a turning state detector that detects a turning state of the vehicle based on the yaw angle; a braking state detector that detects a braking state of the vehicle; and a yaw angle controller that controls the actuator to suppress a yaw angle deviation before and after braking when the turning state of the vehicle is detected by the turning state detector and when the braking state of the vehicle is detected by the braking state detector.
62 Citations
45 Claims
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1-26. -26. (canceled)
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27. A steering control device comprising:
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a steer-by-wire system configured to control an actuator configured to detect displacement of a steering angle when a steering wheel is steered and to operate a turning mechanism that turns a turning wheel separated from the steering wheel based on a detection result; a yaw angle detector configured to detect a yaw angle of a vehicle; a steering angle detector configured to detect the steering angle of the steering wheel; a turning state detector configured to detect a turning state of the vehicle; a traveling state detector configured to detect a braking state or an acceleration state of the vehicle; and a yaw angle controller configured to control the actuator to suppress a yaw angle deviation before and after braking or acceleration in a state where the steering wheel maintains steering, when the turning state of the vehicle is detected by the turning state detector and when the braking state or the acceleration state of the vehicle is detected by the traveling state detector, wherein the yaw angle controller including a target turning amount calculator configured to select, when the turning state of the vehicle is detected by the turning state detector and when the state change due to the acceleration state or braking state is detected, a corresponding target turning amount characteristic line from among a plurality of target turning amount characteristic lines indicating the relationship between the vehicle velocity and the yaw angle where a target turning amount of the actuator is used as a parameter, based on the vehicle velocity after state change and the yaw angle after state change after detecting the state change, and calculates the target turning amount depending on the state change based on the selected target turning amount characteristic line, and to control the actuator so that a turning amount of the turning wheel due to the actuator becomes the target turning amount. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34)
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35. A steering control device comprising:
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a steer-by-wire system configured to control an actuator that detects displacement of a steering angle when a steering wheel is steered and to operate a turning mechanism configured to turn a turning wheel separated from the steering wheel based on a detection result; a yaw angle detector configured to detect a yaw angle of a vehicle; a steering angle detector configured to detect the steering angle of the steering wheel; a turning state detector configured to detect a turning state of the vehicle; a traveling state detector configured to detect a braking state or an acceleration state of the vehicle; and a yaw angle controller configured to control the actuator to suppress a yaw angle deviation before and after braking or acceleration in a state where the steering wheel maintains steering, when the turning state of the vehicle is detected by the turning state detector and when the braking state or the acceleration state of the vehicle is detected by the traveling state detector, wherein the yaw angle controller selects, when the turning state of the vehicle is detected by the turning state detector and when the braking state of the vehicle is detected by a braking state detector, a steering angle characteristic line where a yaw angle at the same vehicle velocity as the vehicle velocity after braking is smaller than the yaw angle after braking based on the vehicle velocity after braking and the yaw angle after braking after the braking state is detected with reference to a target value calculation map having a plurality of steering angle characteristic lines where the steering angle is used as a parameter and indicating the relationship between the vehicle velocity and the yaw angle, calculates a target turning amount from a deviation between a steering angle and a steering angle after braking of the selected steering angle characteristic line, and controls the actuator so that the turning amount of the turning mechanism becomes the target turning amount.
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36. A steering control device comprising:
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a steer-by-wire system configured to control an actuator configured to detect displacement of a steering angle when a steering wheel is steered and operates a turning mechanism that turns a turning wheel separated from the steering wheel based on a detection result; a yaw angle detector configured to detect a yaw angle of a vehicle; a steering angle detector configured to detect the steering angle of the steering wheel; a turning state detector configured to detect a turning state of the vehicle; a traveling state detector configured to detect a braking state or an acceleration state of the vehicle; and a yaw angle controller configured to control the actuator to suppress a yaw angle deviation before and after braking or acceleration in a state where the steering wheel maintains steering, when the turning state of the vehicle is detected by the turning state detector and when the braking state or the acceleration state of the vehicle is detected by the traveling state detector, wherein the yaw angle controller selects a closest steering angle characteristic line where a yaw angle at the same vehicle velocity as the vehicle velocity after acceleration is larger than the yaw angle after acceleration based on the vehicle velocity after acceleration and the yaw angle after acceleration with reference to a target value calculation map having a plurality of steering angle characteristic lines where the steering angle is used as a parameter and indicating the relationship between the vehicle velocity and the yaw angle, and calculates the target steering amount from a deviation between a steering angle of the selected steering angle characteristic line and a steering angle after acceleration.
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37. A steering control device comprising:
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a steer-by-wire system configured to control an actuator configured to detect displacement of a steering angle when a steering wheel is steered and operates a turning mechanism configured to turn a turning wheel separated from the steering wheel based on a detection result; a vehicle yaw angle detector configured to detect a yaw angle of a vehicle; a steering angle detector configured to detect the steering angle of the steering wheel; a vehicle velocity detector configured to detect a vehicle velocity of the vehicle, a turning state detector configured to detect a turning state of the vehicle based on the yaw angle; an acceleration state detector configured to detect an acceleration state of the vehicle; a braking state detector configured to detect a braking state of the vehicle; and a yaw angle controller including a target yaw angle calculator configured to calculate, when the turning state of the vehicle is detected by the turning state detector and when a state change due to the acceleration state or the braking state is detected, a target yaw angle depending on the state change based on the vehicle velocity and the yaw angle after the state change is detected, and to control the actuator so that a yaw angle control amount due to the actuator becomes the target yaw angle, wherein the yaw angle controller including a target turning amount calculator configured to select, when the turning state of the vehicle is detected by the turning state detector and when the state change due to the acceleration state or braking state is detected, a corresponding target turning amount characteristic line from among a plurality of target turning amount characteristic lines indicating the relationship between the vehicle velocity and the yaw angle where a target turning amount of the actuator is used as a parameter, based on the vehicle velocity after state change and the yaw angle after state change after detecting the state change, and calculates the target turning amount depending on the state change based on the selected target turning amount characteristic line, and to control the actuator so that a turning amount of the turning wheel due to the actuator becomes the target turning amount. - View Dependent Claims (38, 39, 40, 41, 42, 43)
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44. A steering control device comprising:
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a steer-by-wire system configured to control an actuator configured to detect displacement of a steering angle when a steering wheel is steered and to operate a turning mechanism configured to turn a turning wheel separated from the steering wheel based on a detection result; a yaw angle detector configured to detect a yaw angle of a vehicle; a steering angle detector configured to detect the steering angle of the steering wheel; a turning state detector configured to detect a turning state of the vehicle; a traveling state detector configured to detect a braking state or an acceleration state of the vehicle; a yaw angle controller configured to control the actuator to suppress a yaw angle deviation before and after braking or acceleration in a state where the steering wheel maintains steering, when the turning state of the vehicle is detected by the turning state detector and when the braking state or the acceleration state of the vehicle is detected by the traveling state detector; an engine brake detector configured to detect an engine braking state of the vehicle; an engine brake controller configured to adjust a braking force of right and left wheels to change a steering characteristic of the vehicle to a neutral steering characteristic; and a straight traveling stability control start delaying section configured to delay start of a straight traveling stability control in the engine brake controller for a predetermined delay time when the engine braking state is detected by the engine brake detector and when the change from the turning state to the straight traveling state is detected by the turning state detector, wherein the yaw angle controller includes a yaw angle control start delaying section configured to delay control start of the yaw angle controller by a predetermined time when a change from a straight traveling state of the vehicle to the turning state of the vehicle is detected by the turning state detector.
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45. A steering control device comprising:
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a steer-by-wire system configured to control an actuator configured to detect displacement of a steering angle when a steering wheel is steered and operates a turning mechanism that turns a turning wheel separated from the steering wheel based on a detection result; a yaw angle detector configured to detect a yaw angle of a vehicle; a steering angle detector configured to detect the steering angle of the steering wheel; a turning state detector configured to detect a turning state of the vehicle; a traveling state detector configured to detect a braking state or an acceleration state of the vehicle; a yaw angle controller configured to control the actuator to suppress a yaw angle deviation before and after braking or acceleration in a state where the steering wheel maintains steering, when the turning state of the vehicle is detected by the turning state detector and when the braking state or the acceleration state of the vehicle is detected by the traveling state detector; lateral force detectors configured to individually detect lateral forces acting on the right and left turning wheels; and a vehicle velocity detector configured to detect a vehicle velocity of the vehicle, an engine brake controller configured to adjust a braking force of right and left wheels to change a steering characteristic of the vehicle to a neutral steering characteristic; wherein the yaw angle controller includes a yaw angle control start delaying section configured to delay control start of the yaw angle controller by a predetermined time when a change from a straight traveling state of the vehicle to the turning state of the vehicle is detected by the turning state detector, and wherein an engine brake controller includes a braking force controller configured to select a corresponding steering angle characteristic line from among a plurality of steering angle characteristic lines indicating the relationship between the vehicle velocity and the lateral forces, in which a target steering angle is used as a parameter, based on the vehicle velocity and the lateral forces, calculates a reference lateral force based on the selected steering angle characteristic line, and to control braking forces with respect to the right and left wheels so that the calculated reference lateral force and the lateral forces match each other.
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Specification