Method For Correctly Carrying Out Autonomous Emergency Braking In A Road Vehicle

• US 20120095660A1
• Filed: 05/03/2010
• Published: 04/19/2012
• Est. Priority Date: 07/09/2009
• Status: Active Grant

• Current Assignee: ZF CV Systems Europe BV (Zeppelin - Stiftung der Stadt Friedrichshafen)
• Original Assignee: Wabco GmbH (Wabco Holdings Incorporated)
• Inventors: Breuer, Karsten, Dieckmann, Thomas, Hoffmann, Guido
• Granted Patent: US 9,428,163 B2
• Time in Patent Office: Days
• US Class Current: 701/70
• CPC Class Codes: B60T 2201/02 Active or adaptive cruise control system; Distance control
• CPC Class Codes: B60T 2201/024 Collision mitigation systems
• CPC Class Codes: B60T 2210/36 Global Positioning System [GPS]
• CPC Class Codes: B60T 2250/04 Vehicle reference speed; Vehicle body speed
• CPC Class Codes: B60T 2270/413 Plausibility monitoring, cross check, redundancy
• CPC Class Codes: B60T 7/18 operated by wayside apparatus
• CPC Class Codes: B60T 7/22 initiated by contact of vehicle, e.g. bumper, with an external object, e.g. another vehicle , or by means of contactless obstacle detectors mounted on the vehicle
• CPC Class Codes: B60T 8/172 Determining control parameters used in the regulation, e.g. by calculations involving measured or detected parameters B60T8/17551 takes precedence

Abstract

The invention proposes a method for correctly carrying out autonomous emergency braking in a road vehicle (1) in order to reduce the severity of an accident, the speed of the vehicle being determined during the autonomous emergency braking. According to the method, a determination of speed which is independent of the wheel rotational speeds of the vehicle is additionally used. By this means, the vehicle speed can be determined sufficiently accurately even in the cases in which, as a result of sharp autonomous braking, the vehicle speed is higher than the wheel rotational speeds.

Claims

1. A method for correctly carrying out autonomous emergency braking in a road vehicle (1) for preventing a rear end accident or for reducing the severity of an accident, wherein the speed of the vehicle (1) is determined by means of wheel sensors (14, 15) during the autonomous emergency braking, and wherein the space in front of the vehicle (1) is monitored at least by means of a distance sensor (4), characterized by additional determination of the speed which is carried out independently of the wheel speeds.

2. The method as claimed in claim 1, characterized in that a radar sensor is used as a distance sensor (4).

3. The method as claimed in one or more of claims 1 to 2, characterized in that a LIDAR sensor is used as a distance sensor (4).

4. The method as claimed in one or more of claims 1 to 3, characterized in that the space in front of the vehicle (1) is additionally monitored with a video camera (3).

5. The method as claimed in one or more of claims 1 to 4, characterized in that the additional determination of the speed is carried out by means of an optical sensor (5) which is mounted on the vehicle (1) and which scans the surface (6) of the road in a contactless fashion.

6. The method as claimed in one or more of claims 1 to 5, characterized in that the additional determination of the speed is carried out by means of a GPS sensor (7).

7. The method as claimed in claim 6, characterized in that the phase shifts of the carrier frequencies of the GPS are evaluated.

8. The method as claimed in one or more of claims 1-7, characterized in that the additional determination of the speed is carried out by evaluating the images of the video camera (3).

9. The method as claimed in one or more of claims 1-8, characterized in that the additional determination of the speed is carried out by evaluating the signals of the distance sensor (4).

10. A road vehicle (1), characterized by the use of a method as claimed in one or more of claims 1 to 9.