Device for controlling traveling of vehicle
First Claim
1. A traveling control apparatus for a vehicle, comprising:
- vehicle position acquisition means for acquiring a position of the vehicle;
curve information acquisition means for acquiring information of a curve of a road on which the vehicle is traveling, the information of the curve being acquired from map information;
vehicle speed acquisition means for acquiring a speed of the vehicle; and
deceleration control means for executing deceleration control which decreases the speed of the vehicle when the vehicle passes through the curve, on the basis of the position of the vehicle, the curve information, and the speed of the vehicle, the traveling control apparatus being characterized by comprising;
actual turning state quantity acquisition means for acquiring an actual turning state quantity which represents an actual turning state of the vehicle;
first execution judgment means for determining, on the basis of the actual turning state quantity, whether execution of the deceleration control is to be permitted or prohibited and for outputting, as a result of the determination, an output which is brought into an enabled state in which execution of the deceleration control is enabled or a disabled state in which execution of the deceleration control is disabled,wherein the deceleration control means executes the deceleration control when the determination result of the first execution judgment means is in the enabled state, and does not execute the deceleration control when the determination result of the first execution judgment means is in the disabled state;
wherein the first execution judgment means comprises heading angle computation means for computing a heading angle of the vehicle, the heading angle being an angle of a traveling direction of the vehicle at the position of the vehicle, in relation to a direction of the straight section before an entrance of the curve, by integrating an actual yaw rate of the vehicle, detected by a yaw rate sensor, from the curve entrance, and by resetting the computed heading angle to zero when an absolute value of a steering wheel angle or of a front wheel steering angle is equal to or less than a predetermined value;
wherein the first execution judgment means sets the determination result to the disabled state when the heading angle is smaller than a first predetermined value, and changes the determination result from the disable state to the enabled state when the heading angle becomes equal to or greater than the first predetermined value; and
wherein the first execution judgment means performs the determination while the vehicle is travelling in an approaching transition curve section of the curve, and, when the determination result of the first execution judgment means is set to the enabled state, the deceleration control means starts the deceleration control while the vehicle is travelling within the approaching transition curve section.
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Accused Products
Abstract
After a vehicle has entered a curve, a deviation (Sch) between a target turning state quantity Td and an actual turning state quantity Ta is computed. In a stage in which Sch does not reach a predetermined value after the vehicle has entered the curve, the possibility of the vehicle traveling in the curve is judged to be low, and the reliability of the curve information Rc, Pc is judged to be low. In this case, a determination for prohibiting execution of control (So=0) is made. In a stage after Sch has reached the predetermined value, the possibility of the vehicle traveling in the curve is judged to be high, and the reliability of the curve information Rc, Pc is judged to be high. In this case, a determination for permitting execution of the control (So=1) is made. Deceleration control is started and executed only when a control start condition is satisfied, and the determination for permission is made. Accordingly, even when the control start condition is satisfied, the deceleration control is not started, if the prohibition determination is made. Thus, the reliability of the curve information based on map information on the vehicle is evaluated reliably, and the deceleration control within the curve can be prevented from being unnecessarily executed on the basis of curve information whose reliability is low.
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Citations
3 Claims
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1. A traveling control apparatus for a vehicle, comprising:
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vehicle position acquisition means for acquiring a position of the vehicle; curve information acquisition means for acquiring information of a curve of a road on which the vehicle is traveling, the information of the curve being acquired from map information; vehicle speed acquisition means for acquiring a speed of the vehicle; and deceleration control means for executing deceleration control which decreases the speed of the vehicle when the vehicle passes through the curve, on the basis of the position of the vehicle, the curve information, and the speed of the vehicle, the traveling control apparatus being characterized by comprising; actual turning state quantity acquisition means for acquiring an actual turning state quantity which represents an actual turning state of the vehicle; first execution judgment means for determining, on the basis of the actual turning state quantity, whether execution of the deceleration control is to be permitted or prohibited and for outputting, as a result of the determination, an output which is brought into an enabled state in which execution of the deceleration control is enabled or a disabled state in which execution of the deceleration control is disabled, wherein the deceleration control means executes the deceleration control when the determination result of the first execution judgment means is in the enabled state, and does not execute the deceleration control when the determination result of the first execution judgment means is in the disabled state; wherein the first execution judgment means comprises heading angle computation means for computing a heading angle of the vehicle, the heading angle being an angle of a traveling direction of the vehicle at the position of the vehicle, in relation to a direction of the straight section before an entrance of the curve, by integrating an actual yaw rate of the vehicle, detected by a yaw rate sensor, from the curve entrance, and by resetting the computed heading angle to zero when an absolute value of a steering wheel angle or of a front wheel steering angle is equal to or less than a predetermined value; wherein the first execution judgment means sets the determination result to the disabled state when the heading angle is smaller than a first predetermined value, and changes the determination result from the disable state to the enabled state when the heading angle becomes equal to or greater than the first predetermined value; and wherein the first execution judgment means performs the determination while the vehicle is travelling in an approaching transition curve section of the curve, and, when the determination result of the first execution judgment means is set to the enabled state, the deceleration control means starts the deceleration control while the vehicle is travelling within the approaching transition curve section. - View Dependent Claims (2, 3)
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Specification