Vehicle Driving Assistance System

• US 20080288140A1
• Filed: 01/09/2008
• Published: 11/20/2008
• Est. Priority Date: 01/11/2007
• Status: Active Grant

• Current Assignee: Subaru Corp.
• Original Assignee: Fuji Heavy Industries Limited (Subaru Corp.)
• Inventors: Matsuno, Koji
• Granted Patent: US 8,060,307 B2
• Time in Patent Office: Days
• US Class Current: 701/41
• CPC Class Codes: B60T 8/17551 determining control parameters related to vehicle stability used in the regulation, e.g. by calculations involving measured or detected parameters
• CPC Class Codes: B60T 8/17558 specially adapted for collision avoidance or collision mitigation road vehicle drive control systems for collision avoidance otherwise than by controlling a particular sub-unit B60W30/09
• CPC Class Codes: B60W 10/18 including control of braking systems
• CPC Class Codes: B60W 10/20 including control of steering systems
• CPC Class Codes: B60W 2420/408 Radar; Laser, e.g. lidar
• CPC Class Codes: B60W 40/04 Traffic conditions
• CPC Class Codes: B62D 15/0265 Automatic obstacle avoidance by steering
• 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

A riskiness reference value Riskm is corrected and calculated for each target object according the a road surface friction coefficient based on a vehicle-to-target time and a collision allowance time, and a riskiness Riskm (ΔAm) for each three-dimensional object is set based on the riskiness reference value Riskm with a range which uses a probability distribution given in an azimuthal angle direction where each target object exists, whereby a riskiness Risk (ΔA) is set for each azimuthal angle. Then, alarming and brake controlling are made to be executed according to a riskiness Risk (0) at an azimuthal angle of 0, and a steering angle control amount θstrt is obtained from the current riskiness Risk (ΔA) of each azimuthal angle and an estimated riskiness Risk (ΔA)e of each azimuthal angle after a set time period.

Claims

1. A vehicle driving assistance system comprising:

driving environment recognition means for recognizing a driving environment ahead of a subject vehicle so as to detect objects;

driving condition detection means for detecting a driving condition of the subject vehicle;

object riskiness setting means for setting an object collision riskiness of the subject vehicle against each of the objects with a range given in an azimuthal direction where each of objects exists as the basis for the subject vehicle based on each of the objects and the driving condition; and

azimuthal angle riskiness setting means for setting an azimuthal angle collision riskiness with the objects when the subject vehicle advances in each azimuthal direction based on a maximum value of the object collision riskiness in each azimuthal direction.

2. The vehicle driving assistance system as set forth in claim 1, wherein

the object riskiness setting means sets the object collision riskiness based on at least either of a reciprocal of a vehicle-to-target time which is calculated by dividing a distance to each of the objects by a speed of the subject vehicle and a reciprocal of a collision allowance time which is calculated by dividing a distance to each of the objects by a relative speed with each of the objects.

3. The vehicle driving assistance system according to claim 1, wherein

the object riskiness setting means corrects the object collision riskiness according to a road surface friction coefficient.

4. The vehicle driving assistance system according to claim 1, wherein

at least any of alarm control, automatic brake control and automatic steering control is executed based on the azimuthal angle collision riskiness.

5. The vehicle driving assistance system according to claim 4, wherein

the system detects riskiness least points where the azimuthal angle collision riskiness shifts from decrease to increase, and the zero points are points where the azimtuhal angle riskiness become zero on both left-hand side and right-hand side of the subject vehicle in a traveling direction thereof, and

executes automatic steering control by calculating an automatic steering control amount according to a target point set by the azimuthal angle collision riskiness on the left-hand side and an absolute value of the azimuthal angle on the left-hand side at a point among riskiness least points and zero points detected on the left-hand side which lies nearest from the center of the subject vehicle, and the azimuthal angle collision riskiness on the right-hand side and an absolute value of the azimuthal angle on the right-hand side at a point among riskiness least points and zero points detected on the right-hand side which lies nearest from the center of the subject vehicle.

6. The vehicle driving assistance system according to claim 5, wherein

the system estimates, as an estimated object collision riskiness, the object collision riskiness of each of objects after set time period with a range given in the azimuthal angle where each of objects is estimated to exist as the basis of the subject vehicle according to the object collision riskiness and the driving condition of the subject vehicle,

calculates an estimated azimuthal angle collision riskiness in each azimuthal angle according to the estimated object collision riskiness, and

corrects the automatic control steering amount by the estimated azimuthal angle collision riskiness

7. The vehicle driving assistance system according to claim 6, wherein

the system sets a predetermined collision riskiness for a position which is blind from the subject vehicle based on at least the current each information of the objects.

8. The vehicle driving assistance system according to claim 6, wherein

the system is unexecuted the automatic steering control in the event that the estimated azimuthal angle collision riskiness at the control target point becomes larger a set value than the current azimuthal angle collision riskiness.

9. The vehicle driving assistance system according to claim 6, wherein

the system is unexecuted the automatic steering control in the event that the estimated azimuthal angle collision riskiness at the control target point shows a tendency to increase when the subject vehicle is steered in a direction associated with the azimuthal direction.