Trailer resetting
system (100) in a vehicle (10) for automatically adjusting the
vehicle dynamics while the vehicle (10) is coupled to a trailer (50, 450) to reduce the probability of trailer (50, 450) jackknifing, wherein the trailer resetting
system (100) comprises a control (34) configured as follows: To obtain trailer profile information (201, 404); to obtain a
dynamic vehicle steering angle, δ, (203, 412) and a dynamic trailer
coupling articulation angle, θ, while the vehicle (10) is moving backwards; continuously maintains a maximum safe vehicle speed, v max, (207, 306, 414) to calculate with which reversing is possible without buckling, based on the trailer profile information (201, 404), of δ, of θ, a predetermined safe time until buckling, TTJ_ne, (410) and a maximum trailer
coupling articulation angle, θ FK , (209, 406), where TTJ_ne is a calibratable time value that specifies a time
safety margin before the occurrence of a buckling state is predicted; a current vehicle longitudinal speed, v, (211) with v max to compare; to automatically generate a speed correction
signal (213) to cause the vehicle (10) to reduce speed below v max to slow down when v the v max exceeds; and to send the speed correction
signal (213) to a vehicle
motion control system to instruct the vehicle
motion control system to adjust v below v maxto reduce, wherein the vehicle
motion control system controls suitable vehicle actuators to reduce v, wherein the trailer profile information (201, 404) includes a vehicle
wheelbase, L, a distance, d, between the rear axle of the vehicle (10) and the
coupling point, and a trailer rear axle spacing, D, wherein: V max = LTTJ _ ne ⋅ E ln ( | [ ( C − B ) tan θ JK 2 + ( A − E ) ] [ ( C − B ) tan θ JK 2 + ( A + E ) ] [ ( C − B ) tan θ 2 + ( A + E ) ] [ ( C − B ) tan θ 2 + ( A − E ) ] | ) , A = LD , B = d D tan δ , C = tan δ , E = A 2 + B 2 − C 2 , d θ dt = VL [ tan δ ( 1 + d D cos θ ) + LD sin θ ] , if d θ dt If positive, then θ JK = θ JK , and if d θ dt If negative, then θ JK = -θ JK .