Assistance system for a motor vehicle comprising a chassis component

Abstract

The invention relates to an assistance system for a motor vehicle (10), comprising an active chassis device and a detection device by means of which a functional state of a steering system (22) of the vehicle can be recognized, wherein the assistance system is designed to control the active chassis device in the event of a faulty functional state of the steering system (22) in order to transfer the motor vehicle (10) to a safe driving state. Components and systems that generate a yaw moment (104) on the motor vehicle (10) are used as active chassis devices, whereby the function of the damaged steering system (22) can be partially replaced. An active chassis device can in particular comprise an active roll stabilization system (18, 20) on the front and / or rear axle, a braking system (28) with wheel brakes (30), or a steering system on the rear axle.

Claims

[1] Assistance system for a motor vehicle (10), comprising at least one active chassis device and a detection device by means of which a faulty functional state of a steering system (22) of the vehicle can be detected, characterized by that the assistance system is designed to control the at least one active chassis device in the event of a faulty functional state of the steering system (22) in order to transfer the motor vehicle (10) into a safe driving state. [2] Assistance system for a motor vehicle (10) according to claim 1, characterized by that the faulty functional state of the steering system (22) can be recognized by a sudden increase or decrease in an input torque and / or an input speed on a steering handle (36). [3] Assistance system for a motor vehicle (10) according to claim 1 or 2, characterized byin that the motor vehicle (10) comprises a steering shaft, wherein the steering handle (36) is fastened to a first end of the steering shaft and an input torque and / or steering speed applied by the steering handle (36) to the steering shaft is detected. [4] Assistance system for a motor vehicle (10) according to one of the preceding claims, characterized by that a driver-intended yaw rate is determined and an actual yaw rate (104) of the motor vehicle (10) is detected, wherein the faulty functional state of the steering system can be recognized by a divergence between the driver-intended yaw rate and the actual yaw rate (104). [5] Assistance system for a motor vehicle (10) according to one of the preceding claims, characterized by that the driver-intended yaw rate is determined based on a position of the steering handle (36). [6] Assistance system for a motor vehicle (10) according to one of the preceding claims, characterized bythat the motor vehicle (10) is only transferred to a safe driving state if the divergence is above a threshold value. [7] Assistance system for a motor vehicle (10) according to one of the preceding claims, characterized by that the motor vehicle (10) has a steer-by-wire steering system, preferably the motor vehicle (10) has a wheel angle adjustment unit (24) which steers at least one vehicle wheel (16) in relation to the yaw rate intended by the driver. [8] Assistance system for a motor vehicle (10) according to one of the preceding claims, characterized by that the transition to the safe driving state is based on a measure to generate a yaw moment in order to compensate for a yaw moment of the faulty steering system (22). [9] Assistance system for a motor vehicle (10) according to one of the preceding claims, characterized bythat before the active landing gear system is activated, the active landing gear systems are checked for faultless function. [10] Assistance system for a motor vehicle (10) according to one of the preceding claims, characterized by that the assistance system comprises a radar sensor which monitors an area around the motor vehicle (10) for obstacles, wherein in the event of an obstacle the active chassis component is controlled in such a way that the motor vehicle (10) does not collide with it. [11] Assistance system for a motor vehicle (10) according to one of the preceding claims, characterized by that before the active landing gear system is activated, the required yaw moment for transferring to the safe driving state is calculated, whereby a maximum yaw moment that can be applied by the active landing gear system is calculated before the activation. [12] Assistance system for a motor vehicle (10) according to one of the preceding claims, characterized bythat in addition to the active landing gear system, further landing gear systems are controlled if the required yaw moment of an active landing gear system is not sufficient to transfer to the safe driving state. [13] Assistance system for a motor vehicle (10) according to one of the preceding claims, characterized by that the active chassis device is a roll stabilisation system (18, 20). [14] Assistance system for a motor vehicle (10) according to one of the preceding claims, characterized by that the active chassis device is a braking device (28) with at least one wheel brake (30), wherein the braking device (28) controls the at least one wheel brake (30) in such a way that one or more vehicle wheels (16) of the motor vehicle (10) are decelerated. [15] Assistance system for a motor vehicle (10) according to one of the preceding claims, characterized bythat the active chassis device is a control unit which is designed to control one or more wheel-individual drive devices (109), wherein one or more vehicle wheels (16) of the motor vehicle (10) are accelerated. [16] Assistance system for a motor vehicle (10) according to one of the preceding claims, characterized by that the active chassis system is a rear-axle steering system. [17] Assistance system for a motor vehicle (10) according to one of the preceding claims, characterized by that the safe driving condition is assessed at least on the basis of a roll, pitch or yaw rate of the motor vehicle (10), preferably on the basis of the driver-intended yaw rate. [18] Assistance system for a motor vehicle (10) according to one of the preceding claims, characterized bythat in the event of intervention by the assistance system, a particularly optical and / or acoustic signal can be generated to warn other road users. [19] Assistance system for a motor vehicle (10) according to one of the preceding claims, characterized by that when the assistance system intervenes, the engine control unit limits the engine power of the motor vehicle (10). [20] Assistance system for a motor vehicle (10) according to one of the preceding claims, characterized by that the faulty functional state consists of a detected hardware error or a detected functional error of the steering system (22). [21] Motor vehicle (10) with a steering system comprising an assistance system according to one of claims 1 to 20. [22] Method for operating a motor vehicle (10), comprising the steps: - Provision of an active chassis device, - detecting an actual yaw rate (104) of the motor vehicle (10), - determining a driver-intended yaw rate and an input torque on a steering handle (36), - Determination of a steering divergence between the driver's intended yaw rate and the actual yaw rate (104), - Controlling the active chassis device in order to transfer the motor vehicle (10) into a safe driving condition if: - the steering divergence exceeds a limit, and / or - the input torque increases or decreases more suddenly.

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