Method for determining an initiation threshold value for an automatic braking process

• US 6,470,986 B2
• Filed: 05/25/2001
• Issued: 10/29/2002
• Est. Priority Date: 11/07/1997
• Status: Expired due to Term

• Current Assignee: Daimler AG (Mercedes-Benz Group AG)
• Original Assignee: DaimlerChrysler AG (Mercedes-Benz Group AG)
• Inventors: Knoff, Bernd, Kiesewetter, Wolfgang, Fuchs, Alexander, Lauer, Carsten, Steiner, Manfred, Maack, Lorenz, Pfeifle, Eberhard
• Primary Examiner(s): Johnson, Brian L.
• Assistant Examiner(s): FISCHMANN, BRYAN R
• Application Number:
  US09/864,162
• Publication Number:
  US 20020011366A1
• Time in Patent Office: 522 Days
• Field of Search: 180/167, 180/168, 180/169, 180/275, 701/79, 701/83, 701/300, 701/301, 701/93, 701/96, 340/903, 340/436, 303/113.3, 303/114.3, 303/155, 303/193, 188/DIG.1
• US Class Current: 180/169
• CPC Class Codes: B60T 2230/04 Jerk, soft-stop; Anti-jerk, reduction of pitch or nose-dive when braking
• CPC Class Codes: B60T 7/12 for automatic initiation; for initiation not subject to will of driver or passenger limiting speed of vehicles other than rail vehicles B60K31/00
• 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 8/3275 Systems with a braking assistant function, i.e. automatic full braking initiation in dependence of brake pedal velocity

Abstract

A method for determining an initiation threshold value for an automatic braking process, in which an automatic braking process is used and a brake pressure is produced which is greater than the brake pressure which corresponds to the operation of the brake pedal by the driver. Short distances between vehicles increase the risk of accidents. If a driver operates the brakes when there is a short distance between the vehicle and the preceding vehicle, in the vast majority of cases, the driver of the following vehicle is often required to perform an emergency braking due to the short distance between the vehicles. To improve the safety of vehicles, an emergency braking is performed, as quickly as possible, when the distance between vehicles is short. This emergency braking, within what is physically possible, ensures rapid deceleration of the vehicle and thus helps to avoid rear-impact accidents. While performing the automatic braking process, the method incorporates a reduction of the initiation threshold value if it is determined that the distance to a preceding vehicle is less than a predetermined limit.

Claims

1. A method for performing an automatic braking process, comprising the steps of:

producing a first brake pressure, during the automatic braking process, which is greater than a second brake pressure which corresponds to an actual position of a brake pedal;

detecting a distance to a preceding vehicle; and

initiating the automatic braking process with a brake pressure reaching the locking limit on at least one vehicle wheel if the distance to the preceding vehicle is less than a limit value.

2. The method according to claim 1, wherein the automatic braking process is terminated if the distance to the preceding vehicle is greater than a predetermined value.

3. The method according to claim 1, wherein the automatic braking process is terminated if a driver has released the brake pedal.

4. The method according to claim 1, wherein the automatic braking process is terminated if a vehicle becomes stationary.

5. The method according to claim 2, wherein the automatic braking process is terminated if the vehicle becomes stationary.