US 12,377,851 B2
Method for supporting a traction vehicle in the event of traction loss
Johannes Heseding, Hannover (DE); and Janik Ricke, Uetze (DE)
Assigned to ZF CV Systems Global GmbH, Bern (CH)
Filed by ZF CV Systems Global GmbH, Bern (CH)
Filed on Jan. 18, 2022, as Appl. No. 17/577,682.
Application 17/577,682 is a continuation of application No. PCT/EP2020/069208, filed on Jul. 8, 2020.
Claims priority of application No. 10 2019 119 786.4 (DE), filed on Jul. 22, 2019.
Prior Publication US 2022/0135041 A1, May 5, 2022
Int. Cl. B60W 30/18 (2012.01); B60R 16/023 (2006.01); B62D 59/04 (2006.01)
CPC B60W 30/18172 (2013.01) [B60R 16/0231 (2013.01); B62D 59/04 (2013.01); B60W 2300/14 (2013.01); B60W 2510/18 (2013.01); B60W 2520/22 (2013.01); B60W 2520/263 (2013.01); B60W 2520/266 (2013.01); B60W 2530/10 (2013.01); B60W 2530/203 (2020.02); B60W 2540/10 (2013.01); B60W 2710/083 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for assisting a towing vehicle in the event of a loss of traction via a trailer vehicle, the method comprising:
determining a differential slip between at least one driven wheel and at least one driveless wheel of the towing vehicle via a brake control unit of the towing vehicle, wherein the differential slip lies above a predefined threshold value;
generating an acceleration demand in a manner dependent upon the determined differential slip in the brake control unit mounted on the towing vehicle;
transmitting the acceleration demand to a trailer brake control unit mounted on the trailer vehicle;
generating an activation signal for an electric drive of the trailer vehicle in a manner dependent upon the acceleration demand in the trailer brake control unit;
transmitting the activation signal from the trailer brake control unit to the electric drive of the trailer vehicle;
generating at least one drive torque via the electric drive of the trailer vehicle in a manner dependent on the activation signal;
determining a trailer vehicle differential slip between at least two wheels of the trailer vehicle which are driven via the electric drive; and,
increasing an activation torque for generating the drive torque via the electric drive from a predefined starting value in stepped fashion or continuously up to a maximum torque value as long as the trailer vehicle differential slip of the driven wheels of the trailer vehicle lies below a further predefined threshold value; and,
wherein the activation signal corresponds to or includes the maximum torque value.