Method for operating a motor vehicle and motor vehicle

Abstract

The invention relates to a method for operating a motor vehicle (10), in which the motor vehicle (10) has two vehicle axles (12, 14) arranged one after the other in the vehicle's longitudinal direction, namely a first vehicle axle (12) and a second vehicle axle (14) following the first vehicle axle (12) towards the rear in the vehicle's longitudinal direction. The first vehicle axle (12) comprises two vehicle wheels (18, 20), namely a first vehicle wheel (18) and a second vehicle wheel (20). The second vehicle axle (14) comprises two vehicle wheels (22, 24), namely a third vehicle wheel (22) and a fourth vehicle wheel (24). The third vehicle wheel (22) is mounted on a chassis of the motor vehicle (10) via an associated first bearing (32). The fourth vehicle wheel (24) is mounted on the chassis via an associated second bearing (34).

Claims

[1] Method for operating a motor vehicle (10), in which: - the motor vehicle (10) has two vehicle axles (12, 14) arranged one after the other in the vehicle's longitudinal direction, namely a first vehicle axle (12) and a second vehicle axle (14) following the first vehicle axle (12) towards the rear in the vehicle's longitudinal direction; - the first vehicle axle (12) has two vehicle wheels (18, 20), namely a first vehicle wheel (18) and a second vehicle wheel (20); - the second vehicle axle (14) has two vehicle wheels (22, 24), namely a third vehicle wheel (22) and a fourth vehicle wheel (24); - the third vehicle wheel (22) is mounted on a chassis of the motor vehicle (10) via an associated first bearing (32); - the fourth vehicle wheel (24) is mounted on the chassis via an associated second bearing (34); - the respective vehicle wheels (18, 20, 22, 24) of the respective vehicle axle (12, 14) are arranged on opposite sides of the motor vehicle (10) in the transverse direction of the vehicle; - the motor vehicle (10) has a steering system (40) associated with the vehicle wheels (18, 20) of the first vehicle axle (12), by means of which the vehicle wheels (18, 20) of the first vehicle axle (12) can be pivoted and thus steered in order to steer the motor vehicle (10); - the steering system (40) has a steering handle (42) which can be actuated and thereby moved by a person, by means of which the vehicle wheels (18, 20) of the first vehicle axle (12) can be steered for steering the motor vehicle (10) and by actuating the steering handle (42); and - the motor vehicle (10) has a drive device (44) assigned to the second vehicle axle (14), by means of which the vehicle wheels (22, 24) of the second vehicle axle (14) can be driven; characterized by , that: - an actuation of the steering handle (42) designed to cause the motor vehicle (10) to corner is detected, wherein the motor vehicle (10) corners during cornering and: ◯ one of the vehicle wheels (22, 24) of the second vehicle axle (14) is a vehicle wheel (22) on the inside of the curve; and ◯ the other vehicle wheel (24) of the second vehicle axle (14) is a vehicle wheel (24) on the outside of the curve; - depending on the detected actuation of the steering handle (42), the bearings (32, 34) designed as active bearings are controlled, whereby a respective bearing stiffness of the respective active bearing (32, 34) is reduced; and - depending on the detected actuation of the steering handle (42), the drive device (44) is operated in such a way that the drive device (44) exerts a driving torque on the vehicle wheel (24) on the outside of the curve and simultaneously exerts a braking torque on the vehicle wheel (22) on the inside of the curve. [2] Method according to claim 1, characterized by that an actuation of the steering handle (42) causing a maximum possible steering angle of the vehicle wheels (18, 20) of the first vehicle axle (12) is detected as the actuation. [3] Method according to claim 1 or 2, characterized by , that: - the drive device (44) has a first electric machine (52) associated with the third vehicle wheel (22); - the drive device (44) has a second electric machine (54) associated with the fourth vehicle wheel (24); - the third vehicle wheel (22) can be driven by means of the first electric machine (52) bypassing the second electric machine (54) and bypassing the fourth vehicle wheel (24); - the fourth vehicle wheel (24) can be driven by means of the second electric machine (54) bypassing the first electric machine (52) and bypassing the third vehicle wheel (22); and - depending on the detected actuation of the steering handle (429), the electric machines (52, 54) are operated in such a way that one of the electric machines (52, 54) exerts the driving torque on the vehicle wheel (24) on the outside of the curve and, at the same time, the other electric machine (52) exerts the braking torque on the vehicle wheel (22) on the inside of the curve. [4] Method according to one of the preceding claims, characterized by , that: - before reducing the respective bearing stiffness, the respective bearing stiffness has a respective first value; and - by reducing the respective bearing stiffness, the respective bearing stiffness is reduced to a respective second value which is lower than the respective first value. [5] Method according to one of the preceding claims, characterized by that when it is detected that the actuation of the steering handle (42) falls below a threshold value, the active bearings (32, 34) are controlled, whereby the respective bearing stiffness of the respective active bearing (32, 34) is increased. [6] Method according to claim 5, characterized by that by increasing the respective bearing stiffness, the respective bearing stiffness is increased to the first value. [7] Method according to one of the preceding claims, characterized byin that the respective vehicle wheel (22, 24) of the second vehicle axle (14) is mounted in an articulated manner on the chassis via at least one respective associated wheel guide (56, 58), wherein the respective wheel guide (56, 58) is mounted on the chassis via the respective bearing (32, 34) assigned to the respective vehicle wheel (22, 24) which is mounted on the chassis via the respective associated wheel guide (56, 58). [8] Motor vehicle (10) which is designed to carry out a method according to one of the preceding claims.

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