Driver assistance system in a motor vehicle

Patent metadata

Field	Value
Publication number	US-11235764-B2
Application number	US-201715784370-A
Country	US
Kind code	B2
Filing date	Oct 16, 2017
Priority date	Apr 17, 2015
Publication date	Feb 1, 2022
Grant date	Feb 1, 2022

Abstract

A driver assistance system is provided in a motor vehicle, which driver assistance system executes at least active transverse guidance interventions. The driver assistance system can be activated while decoupled from the activation of a longitudinal control system but can also be active both, with and without longitudinal control, and includes both a traffic jam assistance sub-function and a track guiding assistant sub-function. The two sub-functions can be jointly activated and deactivated by a single on-/off-button. The driver assistance system is characterized by a special combination of the sub-functions track guiding assistance and traffic jam assistance. They each take turns depending on the presence of conditions, which are defined differently for each sub-function.

First claim

What is claimed is:

1. A driver assistance system in a motor vehicle that carries out at least active lateral guidance interventions and is activatable in a manner decoupled from activation of a longitudinal control system but is activatable both with and without longitudinal control, the driver assistance system comprising:
a traffic jam assistant subfunction of the driver assistance system;
a lane guidance assistant subfunction of the driver assistance system;
a single on/off button by which the traffic jam assistant subfunction and the lane guidance assistant subfunction are configured to be jointly enabled and disabled, wherein
the two subfunctions move from a standby mode to an active mode in response to identified lane markings while the motor vehicle speed exceeds a predefined upper speed threshold and while a vehicle traveling ahead is not identified.

2. The driver assistance system as claimed in claim 1 , wherein
the traffic jam assistant subfunction is activatable when the motor vehicle speed lies below a predefined lower speed threshold, which is below the predefined upper speed threshold, and the vehicle traveling ahead is identified at the same time, and
the traffic jam assistant subfunction performs corrective steering interventions in respect of the vehicle traveling ahead in the form of laterally guided following travel.

3. The driver assistance system as claimed in claim 2 , further comprising:
a safety system for haptic side collision prevention necessarily coupled to the traffic jam assistant subfunction.

4. The driver assistance system as claimed in claim 2 , wherein
the lane guidance assistant subfunction is activatable:
when the motor vehicle speed lies below the predefined lower speed threshold and no vehicle traveling ahead is identified at the same time, and
when the motor vehicle speed lies above the predefined lower speed threshold, and

the lane guidance assistant subfunction carries out corrective steering interventions in respect of a center of the lane.

5. The driver assistance system as claimed in claim 4 , wherein
when the motor vehicle speed lies in a moderate speed range above the predefined lower speed threshold and below the predefined upper speed threshold, the lane guidance assistant subfunction is oriented to the vehicle traveling ahead for a predefined limited period of time when identification of the lane markings is not possible, the vehicle traveling ahead is identified, and only when the lane guidance assistant subfunction is providing active lateral guidance.

6. The driver assistance system as claimed in claim 5 , wherein
the orienting of the lane guidance assistant subfunction to the vehicle traveling ahead for the predefined limited period of time is in a form of a time-limited lane identification bridging operation.

7. The driver assistance system as claimed in claim 4 , wherein
a setpoint trajectory is calculated for the steering interventions from the following parameters, depending on current availability:
lateral distance between the motor vehicle being driven and a left-hand or right-hand lane boundary and/or a center of the vehicle traveling ahead,
angle between the longitudinal axis of the motor vehicle and an identified lane boundary,
bend curvature of the identified lane, and/or
position and movement history of the vehicle traveling ahead in relation to the motor vehicle.

8. The driver assistance system as claimed in claim 1 , wherein
when the driver assistance system is activated, further safety systems are automatically switched on, and
the further safety systems either being fixedly predefinable on a system side or being preselectable by a setup operator control menu on a driver side.

9. The driver assistance system as claimed in claim 4 , wherein
when the driver assistance system is activated, but only when the motor vehicle speed lies above a lower threshold, a check is made by way of a capacitive sensor which is incorporated in a steering wheel to determine whether a driver is touching the steering wheel by way of at least one hand.

10. The driver assistance system as claimed in claim 9 , wherein
in response to the driver letting go of the steering wheel, a request is output to the driver to touch the steering wheel after a relatively short time interval and
a request to take over control of the motor vehicle is output to the driver after a relatively long time interval, wherein
at least the relatively long time interval is predefined depending on the motor vehicle speed.

11. The driver assistance system as claimed in claim 10 , wherein
the relatively long time intervals for the takeover request are predefined to be shorter with increasing speed of the motor vehicle in a moderate speed range, which is below the predefined upper speed threshold and above the predefined lower speed threshold.

12. A driver assistance system in a motor vehicle that carries out at least active lateral guidance interventions and is activatable in a manner decoupled from activation of a longitudinal control system but is activatable both with and without longitudinal control, the driver assistance system comprising:
a traffic jam assistant subfunction of the driver assistance system;
a lane guidance assistant subfunction of the driver assistance system;
a single on/off button by which the traffic jam assistant subfunction and the lane guidance assistant subfunction are configured to be jointly enabled and disabled, wherein
in response to the driver letting go of the steering wheel, a request is output to the driver to touch the steering wheel after a relatively short time interval and a request is output to the driver to take over control of the motor vehicle after a relatively long time interval, which is longer than the relatively short time interval, wherein
the relatively long time interval:
becomes correspondingly shorter as the motor vehicle speed increases over a moderate speed range; and
becomes constant once the motor vehicle speed exceeds a predefined upper speed threshold defined by an upper limit of the moderate speed range and remains constant even as the motor vehicle speed continues to increase beyond the predefined upper speed threshold, and
remains greater than the relatively short time interval for the request to touch the steering wheel.

13. The driver assistance system as claimed in claim 10 , wherein
the two subfunctions move to the standby mode when one of the following conditions is met:
(1) the motor vehicle speed is below the predefined lower speed threshold, the vehicle traveling ahead is no longer identified, and the lane markings are not identified,
(2) the motor vehicle speed is above the predefined lower speed threshold, lane markings are not identified, and the vehicle traveling ahead is not identified to temporarily bridge the lateral guidance interventions,
(3) the motor vehicle speed exceeds the predefined upper speed threshold and no lane marking for lane identification is identified,
(4) a minimum lane width is undershot,
(5) other vehicle systems cause an interruption,
(6) a driver exceeds the permissible hands-of duration (TOR), and
(7) the driver operates an indicator.

14. The driver assistance system as claimed in claim 1 , wherein
in order to indicate the different states of the two subfunctions, the following display concept with different displays, which are usable individually or with one another in any desired combination, is provided:
a. a first display for the standby mode,
b. a second display for corrective steering interventions in respect of the center of a lane,
c. a thir

Assignees

• Bayerische Motoren Werke Ag

Inventors

• Bogner Andreas
• Mueller Andreas
• Simmermacher Daniel
• Hank Hans-Peter
• Paul Manfred
• Froehlich Martin
• Farid Mehdi
• Kaempchen Nico
• Hauke Norman
• Barmeyer Thomas

Classifications

• B60K35/23

  Head-up displays [HUD] (optical aspects of head-up displays G02B27/01) · CPC title

• B60W50/082 Primary

  Selecting or switching between different modes of propelling · CPC title

• B60W30/165

  Automatically following the path of a preceding lead vehicle, e.g. "electronic tow-bar" · CPC title

• B60W30/12 Primary

  Lane keeping · CPC title

• B60W2554/406

  Traffic density · CPC title