JP5083075B2 - Collision prevention device - Google Patents

Description

  The present invention relates to a collision prevention device, and in particular, when an obstacle enters an operation region set in front of the host vehicle, either avoiding a collision between the obstacle and the host vehicle or reducing damage from the collision is performed. The present invention relates to a collision prevention apparatus.

  2. Description of the Related Art Conventionally, an apparatus for recognizing a front obstacle that is highly likely to collide with the host vehicle, avoiding a collision between the obstacle and the host vehicle, and reducing damage from the collision has been proposed. In such a device, it is required to recognize an obstacle at an early stage and quickly perform a collision prevention operation.On the other hand, if a roadside object or the like on a curve is erroneously recognized as an obstacle that collides with the own vehicle, There is a possibility of performing an unnecessary collision prevention operation.

Therefore, for example, Patent Literature 1 discloses a collision prediction apparatus including a collision prediction ECU that estimates the presence state of a front obstacle detected by a radar sensor. This collision prediction ECU estimates the presence state of a front obstacle based on road shape data such as a curve supplied from a GPS (Global Positioning System) navigation device. The collision prediction ECU excludes, for example, a vehicle traveling in the opposite lane of the curve or a signboard installed on the opposite lane of the curve from the obstacle based on the value corrected by the road shape data or the like. To make a collision prediction.
JP 2004-355474 A

  However, it is known that the positioning of the vehicle by GPS has an error. Therefore, it is difficult to accurately determine whether or not the host vehicle is traveling on a curve. On the other hand, a method of determining whether or not the vehicle is traveling along the vehicle curve from the state quantity of the vehicle such as the steering angle and the yaw rate (rotational angular velocity around the center of gravity of the vehicle) is also conceivable. However, in this method, after the rudder angle and the yaw rate fluctuate, it is determined that the host vehicle is traveling on the curve, and therefore it may be delayed to determine that the host vehicle is traveling on the curve. Therefore, there is a demand for a collision prevention device that more accurately determines that the host vehicle is traveling on a curve, and that achieves both reduction in unnecessary operations and improvement in the collision prevention operation speed in the collision prevention device.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a collision prevention apparatus capable of achieving both reduction of unnecessary operations and improvement of the operation speed of collision prevention.

  The present invention performs either obstacle detection means for detecting an obstacle present in front of the host vehicle, avoidance of collision between the obstacle detected by the obstacle detection means and the host vehicle, or reduction of collision damage. A collision prevention means that operates for the purpose, road information acquisition means for acquiring road information relating to the shape of the road on which the host vehicle travels, and vehicle state quantity acquisition means for acquiring a vehicle state quantity that is information relating to the turning state of the host vehicle. The anti-collision means suppresses the operation when it is determined that the host vehicle is traveling on the curve compared to when it is determined that the host vehicle is not traveling on the curve, and the host vehicle is positioned at the curve entrance. Is determined based on the road information acquired by the road information acquisition means, and whether the host vehicle is located at the curve exit is determined based on the vehicle state quantity acquired by the vehicle state quantity acquisition means. Anti-collision device A.

  According to this configuration, in the collision prevention apparatus including the collision prevention unit that operates to either avoid the collision between the obstacle detected by the obstacle detection unit and the host vehicle or reduce the damage of the collision, When the vehicle is determined to be traveling on a curve, the prevention means suppresses the operation compared to when it is determined that the vehicle is not traveling on the curve. Can do. In addition, whether or not the host vehicle is located at the entrance of the curve is determined based on predetermined road information acquired by the road information acquisition means, so that the host vehicle travels the curve after the rudder angle or yaw rate fluctuates. Compared with the case where it is determined that the operation is being performed, an unnecessary operation due to a delay in the determination can be prevented. Furthermore, whether or not the host vehicle is located at the curve exit is determined based on the vehicle state quantity that is information relating to the turning state of the host vehicle acquired by the vehicle state quantity acquisition means, and therefore the host vehicle is not turning. It is possible to release the suppression of the operation at a relatively early time when this is detected, and to improve the effect of preventing a collision on a straight road. Therefore, it is possible to achieve both reduction of unnecessary operations and improvement of the operation speed for preventing collision.

  In this case, when the probability that the obstacle detected by the obstacle detection means collides with the own vehicle is equal to or higher than the threshold, the collision prevention means avoids the collision between the obstacle and the own vehicle and reduces the damage caused by the collision. A vehicle that operates to do any of the above and when the vehicle information is determined by the road information acquired by the road information acquisition means that the host vehicle is located at the entrance of the curve, the threshold is increased and the vehicle acquired by the vehicle state quantity acquisition means When it is determined that the host vehicle is located at the exit of the curve based on the state quantity, the threshold value can be decreased.

  According to this configuration, the collision prevention unit operates depending on whether or not the probability that the obstacle and the host vehicle collide is equal to or higher than the threshold, and the host vehicle is located at the entrance of the curve by the road information acquired by the road information acquiring unit. When it is determined that the vehicle is located, the operation condition is tightened by increasing the threshold value, so that unnecessary operations caused by roadside objects on the curve can be reduced. Further, when it is determined that the host vehicle is located at the exit of the curve based on the vehicle state quantity acquired by the vehicle state quantity acquisition means, the threshold is decreased to reduce the operating condition. Can be improved.

  Alternatively, the collision prevention means sets an operation area in front of the own vehicle, and when the obstacle detected by the obstacle detection means enters the operation area, the collision prevention between the obstacle and the own vehicle is avoided and the collision is prevented. When it is determined that the host vehicle is located at the entrance of the curve based on the road information acquired by the road information acquisition means, the operation area is reduced and the vehicle state quantity is acquired. When it is determined that the host vehicle is located at the exit of the curve based on the vehicle state quantity acquired by the means, the operating area can be expanded.

  According to this configuration, the collision prevention means operates depending on whether or not the obstacle enters the set operation region, and it is determined that the host vehicle is located at the entrance of the curve based on the road information acquired by the road information acquisition means. Sometimes, the operating area is reduced to tighten the operating conditions, so that unnecessary operations due to roadside objects on the curve can be reduced. In addition, when it is determined that the host vehicle is located at the exit of the curve based on the vehicle state quantity acquired by the vehicle state quantity acquisition means, the operation area is expanded and the operating conditions are relaxed. The effect can be improved.

  In this case, when it is determined that the host vehicle is traveling on a curve, it is preferable to change the operation region based on the shape of the road estimated by the vehicle state quantity acquired by the vehicle state quantity acquisition unit.

  According to this configuration, when it is determined that the host vehicle is located within the curve, the collision prevention unit operates based on the shape of the road estimated by the vehicle state quantity acquired by the vehicle state quantity acquisition unit. In order to change the area, the collision prevention means changes the operation area in accordance with the shape of the road estimated by the vehicle state quantity having excellent responsiveness in the curve, thereby reducing unnecessary operations and preventing collisions. The speed can be improved more effectively.

  The road information acquisition means measures the position of the host vehicle on the map, and obtains road information on the shape of the road on which the host vehicle travels based on the position of the host vehicle on the map and the road shape on the map. The acquisition and the collision prevention means preferably determine that the host vehicle is located at the entrance of the curve when the entrance of the curve is included in the range of the positioning error of the road information acquisition means.

  According to this configuration, the road information acquisition means measures the position of the host vehicle on the map, and the shape of the road on which the host vehicle travels based on the determined position of the host vehicle on the map and the road shape on the map. There is a positioning error since the road information is acquired. However, the collision prevention means determines that the own vehicle is located at the entrance of the curve when the entrance of the curve is included within the range of the positioning error of the road information acquisition means, and the own vehicle enters the entrance of the curve. Sometimes, even if positioning error is taken into account, the host vehicle enters the curve after that, so even if the operation is suppressed by road information, the collision prevention operation is hardly delayed, and the operation is suppressed by the curve, Unnecessary operations due to roadside objects on the curve can be reduced.

  The vehicle state quantity acquisition means acquires either the steering angle or the yaw rate of the host vehicle as a vehicle state quantity, and the collision prevention means includes the steering angle of the host vehicle in the vehicle state quantity acquired by the vehicle state quantity acquisition means. When any one of the yaw rates is less than the threshold value, it is preferable to determine that the host vehicle is located at the exit of the curve.

  According to this configuration, when either the steering angle or the yaw rate of the host vehicle is less than the threshold, it is highly likely that the host vehicle has finished turning. It is possible to determine that it is located.

  Further, the collision prevention means determines whether or not the host vehicle is located at the curve exit based on both the road information acquired by the road information acquisition means and the vehicle state quantity acquired by the vehicle state quantity acquisition means, When either the road information or the vehicle state quantity indicates that the host vehicle is located at the exit of the curve, it is preferable to determine that the host vehicle is located at the exit of the curve.

  According to this configuration, even if it is not determined that the host vehicle is located at the exit of the curve based on the vehicle state quantity, it can be determined from the road information that the host vehicle is located at the exit of the curve. Therefore, the certainty of operation can be improved.

  Further, the road information acquisition means measures the position of the host vehicle on the map, and obtains road information on the shape of the road on which the host vehicle travels based on the position of the host vehicle on the map and the road shape on the map. Preferably, the collision prevention means determines that the own vehicle is located at the exit of the curve when the exit of the curve is not included from within the range of the positioning error of the own vehicle of the road information acquisition means. It is.

  According to this configuration, the road information acquisition means measures the position of the host vehicle on the map, and the shape of the road on which the host vehicle travels based on the determined position of the host vehicle on the map and the road shape on the map. There is a positioning error since the road information is acquired. However, the collision prevention means determines that the own vehicle is located at the exit of the curve when the exit of the curve is not included within the range of the positioning error of the road information acquisition means. It is possible to prevent erroneous determination that the host vehicle is located at the exit of the curve despite the fact that the vehicle is located at.

  According to the collision prevention apparatus of the present invention, it is possible to achieve both reduction of unnecessary operations and improvement of the operation speed of collision prevention.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 is a block diagram illustrating a collision prevention apparatus according to an embodiment. The collision prevention apparatus 10 according to the present embodiment detects an obstacle existing on a road on which the host vehicle travels, and when the obstacle enters an operation region set in front of the host vehicle, the obstacle and the host vehicle are detected. It is configured to avoid collisions and reduce the damage caused by collisions. As shown in FIG. 1, the collision prevention apparatus 10 of this embodiment includes a millimeter wave radar sensor 11, an image sensor 12, a vehicle speed sensor 13, a steering angle sensor 14, a yaw rate sensor 15, a GPS 21, a collision prevention ECU 30, a display 41, and a speaker. 42, an occupant protection device 43, and a vehicle control actuator 44 are provided.

  The millimeter wave radar sensor 11 is attached to the front part of the host vehicle, transmits a millimeter wave in front of the host vehicle, and receives a reflected wave from an obstacle on the road. The presence / absence of an object, the distance to the obstacle, and the relative position are detected. The image sensor 12 detects the presence / absence of an obstacle ahead of the host vehicle, the distance from the obstacle, and the relative position using a stereo camera or the like attached to the front of the host vehicle. The millimeter wave radar sensor 11 and the image sensor 12 function as obstacle detection means described in the claims.

  The vehicle speed sensor 13 is provided on the axle of the host vehicle, and detects the vehicle speed of the host vehicle by measuring the rotation speed of the axle. The steering angle sensor 14 is provided on the front wheel of the host vehicle and detects the steering angle of the front wheel of the host vehicle. The yaw rate sensor 15 detects a rotational angular velocity around the center of gravity of the host vehicle as a yaw rate.

  The GPS 21 measures the absolute position on the ground surface of the host vehicle by GPS (Global Positioning System). The absolute position on the ground surface of the host vehicle measured by GPS is collated with separately stored map information. Thereby, GPS11 specifies the position on the map of the own vehicle.

  The ECU 30 includes a road information acquisition unit 31, a vehicle state quantity acquisition unit 32, a course prediction unit 33, an operation region calculation unit 34, and a collision prevention control unit 35. The road information acquisition unit 31 acquires road information related to the road on which the host vehicle travels from the position on the map of the host vehicle specified by the GPS 21. The road information acquisition unit 31 functions as road information acquisition means described in the claims.

  The vehicle state quantity acquisition unit 32 acquires a vehicle state quantity that is information related to turning of the vehicle such as the vehicle speed, the steering angle, and the yaw rate of the host vehicle from the detection signals output from the vehicle speed sensor 13, the steering angle sensor 14, and the yaw rate sensor 15. To do. The vehicle state quantity acquisition unit 32 functions as vehicle state quantity acquisition means described in the claims.

  The course prediction unit 33 predicts the course of the host vehicle using the vehicle state quantities such as the vehicle speed, the steering angle, and the yaw rate of the host vehicle acquired by the vehicle state quantity acquisition unit 32. The course prediction unit 33 corrects and changes the course of the host vehicle predicted by the vehicle speed, the steering angle, and the yaw rate of the host vehicle according to the road shape included in the road information acquired by the road information acquisition unit 31.

  The operation area calculation unit 34 calculates the operation area of the collision prevention control unit 35 from the road information acquired by the road information acquisition unit 31 and the vehicle state quantities such as the vehicle speed, the steering angle, and the yaw rate of the host vehicle acquired by the vehicle state quantity acquisition unit 32. Is set in front of the vehicle.

  The collision prevention means 35 is used when the obstacle detected by the millimeter wave radar sensor 11 and the image sensor 12 enters the operation area in front of the host vehicle set by the operation area calculation unit 34 or by the course prediction unit 33. When it is determined that the course of the own vehicle intersects with the obstacle, the display 41, the speaker 42, the occupant protection device 43, and the vehicle control actuator 44 are prevented from colliding with the obstacle and the own vehicle. Perform actions to mitigate.

  The display 41 notifies the driver of the host vehicle that an obstacle may collide with the host vehicle based on the displayed video. The speaker 42 informs the driver of the own vehicle that there is a possibility that an obstacle may collide with the own vehicle.

  The occupant protection device 43 is for reducing the damage caused by the collision with the occupant or the host vehicle at the time of collision with an obstacle. The occupant protection device 43 includes a seat belt device that prevents the occupant from leaving the seat at the time of collision with an obstacle, a device such as an air bag for mitigating the impact on the occupant, such as an air bag, and an impact energy absorbing load. A device that changes the position of the operation pedal, a device that cuts off the power supply to other than the traveling control system of the host vehicle, and the like.

  The vehicle control actuator 44 includes a brake actuator that automatically decelerates the vehicle speed of the host vehicle, a device that assists the driver's brake pedal force during sudden braking, and a steering actuator that automatically causes the host vehicle to avoid obstacles. Consists of. The display 41, the speaker 42, the occupant protection device 43, the vehicle control actuator 44, the course prediction unit 33, the operation region calculation unit 34, and the collision prevention control unit 35 function as a collision prevention unit described in the claims.

  Hereinafter, the operation of the collision prevention apparatus 10 of the present embodiment will be described. FIG. 2 is a flowchart showing the operation of the collision prevention apparatus 10 according to the embodiment, and FIG. 3 is a plan view showing the situation of a road with a curve to which the collision prevention apparatus 10 of the embodiment is applied. As shown in FIG. 3, the following description will be made assuming a situation in which the host vehicle V is approaching a curved road.

  As shown in FIG. 2, the measurement value is input from each sensor to the collision prevention ECU 30 (S101). From the millimeter wave radar sensor 11 and the image sensor 12, the presence / absence of an obstacle, the distance to the obstacle, and the relative position with the obstacle are input. From the vehicle speed sensor 13, the steering angle sensor 14, and the yaw rate sensor 15, the vehicle speed, the steering angle, and the yaw rate of the host vehicle are input. From the GPS 21, the position of the host vehicle on the map is input.

  When the road shape acquisition unit 31 does not detect the curve entrance S due to the road shape on which the host vehicle V travels (S102), since the host vehicle V is traveling on a straight road, the operation region calculation unit 34 is The operation area A is maintained in an enlarged state (S103). When the road shape acquisition unit 31 detects the curve entrance S based on the road shape on which the host vehicle travels (S102), the operation region calculation unit 34 reduces the operation region A by the method described in detail below ( S104 to S107).

  As shown in FIG. 4, when the operation area A is not changed at the curve entrance S, the roadside object O that is not in the traveling direction of the host vehicle V enters the operation area A, and the collision between the host vehicle V and the obstacle occurs. The collision prevention control unit 35 performs an unnecessary operation such as avoiding a collision, despite the fact that there is no problem.

  Here, as shown in FIG. 5, when the host vehicle V enters the curve entrance S, the operation region A bends so as to overlap the curve shape of the road, and it is unnecessary operation to expand in the traveling direction of the host vehicle V. Ideal in terms of reduction. However, when the curve shape of the road is determined from the state quantity of the host vehicle V such as the rudder angle and yaw rate, it is determined that the host vehicle V is traveling on the curve after the rudder angle and yaw rate fluctuate. The determination that the vehicle V is traveling on a curve is delayed, and as a result, the change of the operation region A may be delayed.

On the other hand, this embodiment determines that the host vehicle V is traveling on a curve by measuring the position of the host vehicle V on the map by the GPS 21. In this case, since there is a positioning error in the GPS 21, the region where the host vehicle V may be located is a margin length l that is an error range of the GPS 21 in the traveling direction of the host vehicle V as shown in FIG. _It is in the margin area M having M.

Therefore, in this embodiment, as shown in FIG. 7, the operation region calculation unit 34 changes the operation region A before the host vehicle V reaches the curve entrance S even if the positioning error by the GPS 21 is maximum. As described above, when the curve entrance S is included in the positioning error range of the host vehicle V by the GPS 21, that is, when it is determined that the curve entrance S is ahead of the margin length l _M / 2 of the host vehicle V, It is determined that the host vehicle V is located at the curve entrance S, and the operation area A is changed.

  Returning to FIGS. 2 and 3, for the above reason, when the operation area calculation unit 34 detects the curve entrance S by the road shape acquisition unit 31 by the GPS 21 (S <b> 102), after the host vehicle V enters the margin area M (S103), the operation area calculation unit 34 reduces the operation area A (S105). Thereafter, the host vehicle V enters the curve (S106).

  In the curve, the operation region calculation unit 34 calculates the curve shape of the road of the host vehicle V based on the steering angle and yaw rate of the host vehicle V acquired by the vehicle state quantity acquisition unit 32, and the curve shape and the operation region A are calculated. The operation area A is changed so that the area overlapping with the maximum becomes (S107).

  When the road shape acquisition unit 31 and the vehicle state quantity acquisition unit 32 detect the curve exit E (S108), the operation region calculation unit 34 expands the operation region A by a method described in detail below (S109 to S109). S110).

  As described above, when the curve shape of the road is determined from the state amount of the host vehicle V such as the rudder angle and yaw rate, it is determined that the host vehicle V is traveling on the curve after the rudder angle and yaw rate fluctuate. Therefore, there is a possibility that it is delayed to determine that the host vehicle V is traveling on a curve. However, when the vehicle exits from the curve, the operating area A is widened from a narrow range, so the delay is allowed. The Therefore, in the present embodiment, as shown in FIG. 8, when the host vehicle V exits the curve exit E, the rudder angle and the yaw rate are less than predetermined threshold values, and it is determined that the host vehicle V is traveling straight. The operating region calculation unit 34 enlarges the operating region A.

  On the other hand, in the present embodiment, in a road where left and right curves are mixed, a situation in which it is difficult to determine the curve exit E of the road by only the state amount of the host vehicle V such as a steering angle and a yaw rate is considered. Also, the curve exit E is detected.

As described above, since the GPS 21 has a positioning error, the region where the host vehicle V may be located is a margin region having a margin length l _M that is an error range of the GPS 21 in the traveling direction of the host vehicle V. Within M. Here, if the operation area A is enlarged in the curve, the roadside object O in the curve easily enters the operation area A, and the collision prevention control unit 35 easily performs an unnecessary operation.

Therefore, as shown in FIG. 9, in this embodiment, the operation region calculation unit 34 changes the operation region A after the host vehicle V reaches the curve exit E even if the positioning error by the GPS 21 is the maximum. As described above, when the curve exit E is not included in the positioning error range of the host vehicle V by the GPS 21, that is, it is determined that the curve exit E is not included behind the margin length l _M / 2 of the host vehicle V. When it is determined that the host vehicle V is located at the curve exit E, the operation region calculation unit 34 changes the operation region A.

  2 and 3, for the above reason, when the operation region calculation unit 34 detects the curve exit E based on the vehicle state amount by the vehicle state amount acquisition unit 32 (S108), the operation region calculation unit 34 operates the operation region A. Is enlarged (S110). On the other hand, when the operation area calculation unit 34 detects the curve exit E by the road shape acquisition unit 31 by the GPS 21, the own vehicle V enters the margin area M (S109), and then the operation area calculation unit 34 operates the operation area A. Is enlarged (S110).

  Thereafter, when an obstacle on the road approaches (S111), an obstacle enters the expanded operation area A, so that the collision prevention control unit 35 quickly activates the occupant protection device 43 and the like against the obstacle. It will be operated (S112).

  According to the present embodiment, the collision prevention apparatus 10 including the collision prevention control unit 35 that avoids collision between the obstacle detected by the millimeter wave radar sensor 11 and the image sensor 12 and the own vehicle V and reduces collision damage. In this case, when the collision prevention control unit 35 determines that the host vehicle V is traveling on a curve, the collision prevention control unit 35 suppresses the operation compared to when it is determined that the vehicle V is not traveling on the curve. Unnecessary operations due to can be reduced. Further, whether or not the host vehicle V is located at the curve entrance S is determined based on the predetermined road information acquired by the road information acquiring unit 31. Therefore, the host vehicle V is changed after the rudder angle or the yaw rate is changed. Compared with the case where it is determined that the vehicle is traveling on a curve, unnecessary operations due to a determination delay can be prevented. Further, whether or not the host vehicle V is located at the curve exit E is determined based on the vehicle state quantity that is information related to the turning state of the host vehicle V acquired by the vehicle state quantity acquisition unit 32. It is possible to release the suppression of the operation at a relatively early time when it is detected that the vehicle is not turning, and to improve the collision prevention effect on the straight road. Therefore, it is possible to achieve both reduction of unnecessary operations and improvement of the operation speed for preventing collision.

  That is, according to the present embodiment, the system can be operated at a more optimal timing by setting the operating conditions of the system in accordance with the road shape. Moreover, according to this embodiment, the influence of the positioning error by GPS21 which arises in that case can be suppressed. As a result, according to the present embodiment, it is possible to reduce damage due to traffic accidents and the like.

  In addition, according to the present embodiment, the collision prevention control unit 35 operates depending on whether an obstacle enters the operation area A set by the operation area calculation unit 34, and the road information acquired by the road information acquisition unit 31. Therefore, when it is determined that the host vehicle V is located at the curve entrance S, the operation area A is reduced to tighten the operation conditions, so that unnecessary operations due to the roadside object O or the like on the curve can be reduced. Further, when it is determined that the host vehicle V is located at the curve exit E based on the vehicle state quantity acquired by the vehicle state quantity acquisition unit 32, the operating area A is expanded to ease the operating conditions. The effect of collision prevention can be improved.

  Furthermore, according to the present embodiment, when it is determined that the host vehicle V is located within the curve, the operation region calculation unit 34 is estimated based on the vehicle state quantity acquired by the vehicle state quantity acquisition unit 32. In order to change the operation region A based on the shape of the road, the operation region calculation unit 34 changes the operation region A according to the shape of the road estimated by the vehicle state quantity having excellent responsiveness in the curve. Accordingly, it is possible to more effectively realize reduction of unnecessary operations and improvement of the operation speed for preventing collision.

  On the other hand, according to this embodiment, the road information acquisition part 31 measures the position on the map of the own vehicle V based on the positioning result of GPS21, and the position on the map of the measured own vehicle V and the road on the map Since road information related to the shape of the road on which the host vehicle V travels is acquired based on the shape, there is a positioning error. However, when the curve entrance S is included in the range of the positioning error by the GPS 21 of the road information acquisition unit 31, the operation region calculation unit 34 determines that the host vehicle V is located at the curve entrance S, and the host vehicle When V enters the curve entrance S, even if positioning error is taken into consideration, the vehicle V enters the curve after that, so even if the operation is suppressed by road information, the collision prevention operation is less likely to be delayed, and the curve By suppressing the operation, unnecessary operations caused by roadside objects on the curve can be reduced.

  Further, according to the present embodiment, when either the steering angle or the yaw rate of the host vehicle V is less than the threshold value, it is highly likely that the host vehicle V has finished turning. It becomes possible to determine that V is located at the curve exit E.

  In addition, according to the present embodiment, even if it is not determined that the host vehicle V is located at the curve exit E based on the vehicle state quantity, the host vehicle V is located at the curve exit E based on the road information. Since the determination can be made, the certainty of the operation can be improved.

  Furthermore, according to this embodiment, the road information acquisition part 31 measures the position on the map of the own vehicle V, and the own vehicle based on the position on the map of the measured own vehicle V and the road shape on the map. Since road information related to the shape of the road on which V runs is acquired, a positioning error exists. However, when the curve exit E is not included in the positioning error range of the road information acquisition unit 31, the operation region calculation unit 34 determines that the host vehicle V is located at the curve exit E. It is possible to prevent erroneous determination that the host vehicle is located at the curve exit E even though the vehicle V is located within the curve.

  It should be noted that the present invention is not limited to the above-described embodiment, and it is needless to say that various modifications can be made without departing from the gist of the present invention. For example, in the embodiment described above, the aspect of reducing the operation region A in order to suppress the operation of the collision prevention control unit 35 has been described, but the present invention is not limited to this. For example, when the probability that the obstacle detected by the millimeter wave radar sensor 11 and the image sensor 12 collides with the host vehicle V is equal to or greater than a threshold, the collision prevention control unit 35 causes the collision between the obstacle and the host vehicle V. It can act to either avoid or reduce collision damage. In this case, when the collision prevention control unit 35 determines that the host vehicle V is located at the curve entrance S based on the road information acquired by the road information acquisition unit 31, the collision prevention control unit 35 increases the threshold value for collision determination. When it is determined that the host vehicle V is located at the curve exit E based on the vehicle state amount acquired by the state amount acquisition unit 32, the threshold for collision determination can be decreased.

  Alternatively, the collision prevention control unit 35 may suppress the operation by increasing the existence probability of the obstacle detected by the millimeter wave radar sensor 11 and the image sensor 12 and the threshold value for detecting the obstacle.

It is a block diagram which shows the collision prevention apparatus which concerns on embodiment. It is a flowchart which shows operation | movement of the collision prevention apparatus which concerns on embodiment. It is a top view which shows the condition of the road with the curve to which the collision prevention apparatus of embodiment is applied. It is a top view which shows the condition when not changing an operation area | region in a curve entrance. It is a top view which shows the condition at the time of changing an operation area | region ideally in a curve entrance. It is a top view which shows the relationship between the error of the position measurement by GPS, and a margin area | region. It is a top view which shows the condition at the time of actually changing an operation area | region in the curve entrance. It is a top view which shows the condition at the time of a curve exit detecting a curve exit with a vehicle state quantity, and changing an operation area | region. It is a top view which shows the condition at the time of a curve exit, detecting a curve exit by GPS and changing an operation area | region.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Collision prevention apparatus, 11 ... Millimeter wave radar sensor, 12 ... Image sensor, 13 ... Vehicle speed sensor, 14 ... Steering angle sensor, 15 ... Yaw rate sensor, 21 ... GPS, 30 ... Collision prevention ECU, 31 ... Road information acquisition part 32 ... Vehicle state quantity acquisition unit, 33 ... Course prediction unit, 34 ... Operation region calculation unit, 35 ... Collision prevention control unit, 41 ... Display, 42 ... Speaker, 43 ... Passenger protection device, 44 ... Vehicle control actuator.

Claims (5)

Obstacle detection means for detecting obstacles existing in front of the host vehicle;
Collision prevention means that operates to either avoid avoidance of collision between the obstacle detected by the obstacle detection means and the host vehicle or to reduce damage from collision,
Road information acquisition that measures the position of the host vehicle on the map and acquires road information related to the shape of the road on which the host vehicle travels based on the determined position of the host vehicle on the map and the road shape on the map Means,
Vehicle state quantity acquisition means for acquiring a vehicle state quantity that is information relating to the turning state of the host vehicle;
With
The collision preventing means is
When it is determined that the host vehicle is traveling on a curve, the operation is suppressed compared to when it is determined that the vehicle is not traveling on a curve ,
It is determined whether or not the host vehicle is located at a curve entrance based on the road information acquired by the road information acquisition means, and the curve entrance is included in the range of the positioning error of the road information acquisition means. When it is determined that the vehicle is located at the entrance of the curve,
It is determined whether or not the host vehicle is located at a curve exit based on both the road information acquired by the road information acquisition unit and the vehicle state quantity acquired by the vehicle state quantity acquisition unit, and the road When either the information or the vehicle state quantity indicates that the host vehicle is located at the exit of the curve, it is determined that the host vehicle is located at the exit of the curve, and the road information acquisition means A collision prevention apparatus that determines that the host vehicle is located at an exit of a curve when the exit of the curve is not included within a range of positioning error of the host vehicle .   When the probability that the obstacle detected by the obstacle detection means collides with the host vehicle is equal to or greater than a threshold, the collision prevention unit avoids the collision between the obstacle and the host vehicle and damages the collision. When the vehicle information is determined by the road information acquired by the road information acquisition means to be located at the entrance of a curve, the threshold is increased, and the vehicle The collision prevention device according to claim 1, wherein the threshold value is decreased when it is determined that the host vehicle is located at an exit of a curve based on the vehicle state amount acquired by the state amount acquisition unit.   The collision prevention means sets an operating area in front of the host vehicle, and the obstacle detected by the obstacle detecting means collides with the host vehicle when the obstacle enters the operating area. When the vehicle is determined to be located at the entrance of a curve based on the road information acquired by the road information acquisition means, the operation is performed. 2. The operation area is expanded according to claim 1, wherein the area is reduced and the operation area is enlarged when it is determined that the host vehicle is located at an exit of a curve based on the vehicle state quantity acquired by the vehicle state quantity acquisition unit. Anti-collision device.   When the collision prevention means determines that the host vehicle is traveling on a curve, the collision prevention means changes the operating region based on the shape of the road estimated by the vehicle state quantity acquired by the vehicle state quantity acquisition means. The collision preventing apparatus according to claim 3. The vehicle state quantity acquisition means acquires either the steering angle or yaw rate of the host vehicle as the vehicle state quantity,
The collision preventing means is located at an exit of a curve when either the steering angle or the yaw rate of the own vehicle in the vehicle state quantity acquired by the vehicle state quantity acquiring means is less than a threshold value. It is with judges, collision avoidance device according to any one of claims 1-4.

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