Vehicle Collision Avoidance Equipment and Method

• US 20080243389A1
• Filed: 01/17/2008
• Published: 10/02/2008
• Est. Priority Date: 03/26/2007
• Status: Abandoned Application

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Sakamoto, Hiroshi, Monji, Tatsuhiko, Yoshida, Tatsuya, Nishigaito, Takaomi, Ueyama, Mikio, Yamauchi, Shin, Inoue, Takeshi
• Application Number:
  US12/015,782
• Publication Number:
  US 20080243389A1
• Time in Patent Office: Days
• US Class Current: 701/301
• CPC Class Codes: G08G 1/165 for passive traffic, e.g. including static obstacles, trees
• CPC Class Codes: G08G 1/166 for active traffic, e.g. moving vehicles, pedestrians, bikes
• CPC Class Codes: G08G 1/167 Driving aids for lane monitoring, lane changing, e.g. blind spot detection

Abstract

An object recognizing means obtains a relative physical value between a movable body and an object such as at least one of the other movable body, an object on the ground, a position on the ground, a topographical feature and a regional information around the movable body, and a safety keeping area calculator calculates an imaginary safety keeping area around the movable body from the relative physical value, and an object intrusion judging means decides as to at least one of whether or not the object is within the safety keeping area and whether or not the object will be within the safety keeping area to perform at least one of controlling for preventing a collision between the movable body and the object and outputting an alarm, when deciding the at least one of that the object is within the safety keeping area and that the object will be within the safety keeping area.

Claims

1. A collision avoidance apparatus comprising,

an input device for receiving a relative physical value between a movable body and an object such as at least one of the other movable body, an object on the ground, a position on the ground, a topographical feature and a regional information around the movable body,

a safety keeping area determining device for determining an imaginary safety keeping area around the movable body in accordance with the relative physical value,

an object intrusion judging device for deciding as to at least one of whether or not the object is within the safety keeping area and whether or not the object will be within the safety keeping area, and

an output device for performing at least one of controlling for preventing a collision between the movable body and the object and outputting an alarm, when the at least one of that the object is within the safety keeping area and that the object will be within the safety keeping area is decided by the object intrusion judging device.

2. The collision avoidance apparatus according to claim 1, further comprising a relative physical value calculating device for calculating the relative physical value, wherein the input device receives the relative physical value calculated by the relative physical value calculating device.

3. The collision avoidance apparatus according to claim 2, wherein the relative physical value calculating device calculates the relative physical value from a signal generated by an object recognizing device including at least one of a radar and a camera.

4. The collision avoidance apparatus according to claim 2, wherein the relative physical value calculating device calculates from a signal generated by a navigation device a position, velocity and a traveling direction of the movable body as the relative physical value.

5. The collision avoidance apparatus according to claim 2, wherein the relative physical value calculating device calculates from a signal generated by at least one of a direction indicator, a steering angle sensor and a navigation device indicating a predetermined traveling coarse a traveling direction of the movable body as the relative physical value.

6. The collision avoidance apparatus according to claim 1, wherein the safety keeping area determining device changes a size of the safety keeping area in accordance with the relative physical value.

7. The collision avoidance apparatus according to claim 1, wherein the input device receives the relative physical value between the movable body and each of a plurality of the objects, and the safety keeping area determining device determines the imaginary safety keeping area for each of the objects.

8. The collision avoidance apparatus according to claim 1, wherein the safety keeping area determining device expands the safety keeping area to increase a width of the safety keeping area in a radially outward direction from the movable body.

9. The collision avoidance apparatus according to claim 8, wherein the movable body has a door at its side, and the safety keeping area determining device determines a minimum width of the safety keeping area to be equal to a transverse width of the movable body obtained when the door is opened.

10. The collision avoidance apparatus according to claim 8, wherein the safety keeping area determining device determines a width of the safety keeping area in accordance with an operating tendency for steering wheel by a driver of the movable body.

11. The collision avoidance apparatus according to claim 1, wherein the safety keeping area determining device increases a width of the safety keeping area and changes a ratio of the width of the safety keeping area/an absolute value of a velocity of the movable body so that the greater the absolute value of the velocity of the movable body is, the smaller the ratio is.

12. The collision avoidance apparatus according to claim 1, wherein the safety keeping area determining device determines a length of the safety keeping area in a traveling direction of the movable body in accordance with at least one of a velocity of the movable body with respect to the ground and a relative velocity between the movable body and the object.

13. The collision avoidance apparatus according to claim 12, wherein the safety keeping area determining device determines the length of the safety keeping area in accordance with a time period of free-running of the movable body and a maximum deceleration of the movable body.

14. The collision avoidance apparatus according to claim 13, wherein the maximum deceleration is 0.2 G.

15. The collision avoidance apparatus according to claim 1, wherein the safety keeping area determining device is prevented from determining the safety keeping area for the object moving away from the movable body.

16. The collision avoidance apparatus according to claim 1, wherein the safety keeping area determining device determines for the object moving away from the movable body the safety keeping area to have a minimum value.

17. The collision avoidance apparatus according to claim 1, wherein the output device is prevented from performing for the object moving away from the movable body the at least one of controlling for preventing the collision between the movable body and the object and outputting the alarm.

18. The collision avoidance apparatus according to claim 1, wherein the safety keeping area determining device determines a width of the safety keeping area at a side thereof facing to the object in accordance with a relative velocity in transverse direction between the movable body and the object.

19. The collision avoidance apparatus according to claim 1, wherein when the movable body moves from a traffic lane to another traffic lane, the safety keeping area determining device increases a width of the safety keeping area at a side thereof facing to the another traffic lane.

20. The collision avoidance apparatus according to claim 1, wherein the safety keeping area determining device determines a traveling direction of the movable body from a signal generated by at least one of a direction indicator, a steering angle sensor and a navigation device indicating a predetermined traveling coarse, and expands the safety keeping area in the traveling direction.

21. The collision avoidance apparatus according to claim 20, wherein when the movable body turns at a traffic intersection to pass a pedestrian crossing, the safety keeping area determining device expands the safety keeping area to cover the pedestrian crossing.

22. The collision avoidance apparatus according to claim 1, wherein when the movable body proceeds along a curved coarse, the safety keeping area determining device deforms the safety keeping area to be curved.

23. The collision avoidance apparatus according to claim 1, wherein the safety keeping area determining device rotates the safety keeping area in accordance with a steering angle to follow a change in orientation of the movable body ordered by the steering angle.

24. The collision avoidance apparatus according to claim 1, wherein the safety keeping area determining device modifies the safety keeping area in accordance with a steering angle to be expanded in a traveling direction of the movable body ordered by the steering angle.

25. The collision avoidance apparatus according to claim 1, wherein the object intrusion judging device forecasts a future traveling coarse of the other object, and when the future traveling coarse of the other object is at least partially covered by the safety keeping area, the object intrusion judging device decides that the object will be within the safety keeping area.

26. The collision avoidance apparatus according to claim 1, wherein when the object intrusion judging device decides that the object will be within the safety keeping area, the output device calculates a deceleration of the movable body from a combination of an offset rate and a relative velocity and distance between the movable body and the object which combination is obtained when the object reaches the safety keeping area, and outputs the deceleration to the movable body to prevent the collision between the movable body and the object.

27. The collision avoidance apparatus according to claim 26, wherein when the object intrusion judging device decides that each of a plurality of the objects will be within the safety keeping area, the output device calculates a deceleration of the movable body from a combination of an offset rate and a relative velocity and distance between the movable body and each of the objects which combination is obtained when each of the objects reaches the safety keeping area, and the output device outputs the greatest one in absolute value of the decelerations to the movable body.

28. The collision avoidance apparatus according to claim 1, wherein when the object intrusion judging device decides that the object will be within the safety keeping area, the output device outputs a signal for ordering a steering angle to rotate the safety keeping area in accordance with the steering angle so that the object is prevented from proceeding into the safety keeping area.

29. The collision avoidance apparatus according to claim 28, wherein when the object intrusion judging device decides that each of a plurality of the objects will be within the safety keeping area, the output device calculates the signal for ordering the steering angle to rotate the safety keeping area in accordance with the steering angle so that each of the objects is prevented from proceeding into the safety keeping area, and the output device outputs the greatest one of the steering angles

30. The collision avoidance apparatus according to claim 1, wherein the output device outputs a signal for showing on a display at least one of the safety keeping area, the object which is within the safety keeping area, the object which will be within the safety keeping area.

31. The collision avoidance apparatus according to claim 1, wherein the safety keeping area extends vertically.

32. The collision avoidance apparatus according to claim 1, wherein the safety keeping area determining device expands the safety keeping area in a direction opposite to a traveling direction of the movable body when the object exists behind the movable body and moves toward the movable body, and when the object intrusion judging device decides the at least one of that the object is within the safety keeping area and that the object will be within the safety keeping area, the output device outputs a signal for accelerating the movable body.

33. The collision avoidance apparatus according to claim 1, wherein the safety keeping area determining device expands the safety keeping area in a traveling direction of the movable body when the movable body moves on a downward slope, and shortens the safety keeping area along the traveling direction of the movable body when the movable body moves on an upward slope.

34. The collision avoidance apparatus according to claim 1, wherein the safety keeping area determining device expands the safety keeping area when at least one of an increase in absolute value of deceleration ordered by a driver for the movable body, an increase in time period for a response by the driver, and an increase in fatigue of the driver.

35. The collision avoidance apparatus according to claim 1, wherein the safety keeping area determining device determines the safety keeping area on the basis of information of the object received from at least one of an infra-communication and a communication between the movable object and the other movable object.

36. A method for avoiding a collision, comprising the steps of:

receiving a relative physical value between a movable body and an object such as at least one of the other movable body, an object on the ground, a position on the ground, a topographical feature and a regional information around the movable body,

determining an imaginary safety keeping area around the movable body in accordance with the relative physical value,

performing at least one of controlling for preventing the collision between the movable body and the object and outputting an alarm, when deciding the at least one of that the object is within the safety keeping area and that the object will be within the safety keeping area.