US 12,371,036 B2
Method for operating a motor vehicle using an error brake safety system
Frank Bärecke, Wolfsburg (DE); and Hauke Christian Schlimme, Braunschweig (DE)
Assigned to VOLKSWAGEN AKTIENGESELLSCHAFT, Wolfsburg (DE)
Filed by Volkswagen Aktiengesellschaft, Wolfsburg (DE)
Filed on Aug. 31, 2021, as Appl. No. 17/462,142.
Claims priority of application No. 10 2020 211 022.0 (DE), filed on Sep. 1, 2020.
Prior Publication US 2022/0063645 A1, Mar. 3, 2022
Int. Cl. B60W 50/04 (2006.01); B60W 10/04 (2006.01); B60W 10/18 (2012.01); B60W 50/038 (2012.01); B60W 60/00 (2020.01); G01C 21/34 (2006.01)
CPC B60W 50/038 (2013.01) [B60W 10/04 (2013.01); B60W 10/18 (2013.01); B60W 60/0025 (2020.02); G01C 21/3438 (2013.01); B60W 2556/45 (2020.02)] 14 Claims
OG exemplary drawing
 
1. A method for operating a motor vehicle, comprising: monitoring a main brake system for a critical error, the critical error corresponding to a loss of a service brake function of the main brake system;
detecting the critical error;
in response to detecting the critical error, switching the motor vehicle from a normal mode to an error mode in which a performance of a drive unit of the motor vehicle is reduced, comprising in the error mode: activating at least one navigation function of the motor vehicle; activating an additional function of the motor vehicle;
switching an error brake system, separate from the main brake system, to an error operating mode so that the error brake system provides at least a part of the service brake function;
and defining the performance of the drive unit of the motor vehicle according to a performance of the error brake system of the motor vehicle;
wherein the main brake system comprises a first onboard system of the motor vehicle operable to reduce the rotating speed of one or more wheels of the motor vehicle;
wherein the error brake system comprises a second onboard system of the motor vehicle operable to reduce the rotating speed of one or more wheels of the motor vehicle;
and wherein an additional critical error in the error brake system triggers an emergency standstill operation using a second error brake system comprising a third onboard system of the motor vehicle separate from the main brake system and the error brake system, the second error brake system operable to reduce the rotating speed of one or more wheels of the motor vehicle;
wherein the additional critical error corresponds to a loss of the service brake function in the error brake system;
and wherein normal operation of the main brake system provides more braking power than the error brake system and operation of the error brake system provides more braking power than the second error brake system.