TRANSPORT KEY FOR A STEER-BY-WIRE STEERING SYSTEM FOR MOTOR VEHICLES

Abstract

A steer-by-wire steering system for motor vehicles may include a primary steering level with a steering transmission device, which is arranged to subject wheels of the motor vehicle to a desired setpoint steering effect, and a secondary steering level with a safety device that provides predefined functions, so that in the case of a malfunction of the primary steering level, steering the wheels remains possible during an emergency mode. The steer-by-wire steering system may also include an authentication system with a communications interface for communications with the safety device. The authentication system may be arranged so that in the case of a successful authorization, the secondary steering level of the steer-by-wire steering system is also available after the emergency mode.

Claims

1.-12. (canceled)

13. A steer-by-wire steering system for a motor vehicle comprising: a primary steering level with a steering transmission device, which is arranged to subject wheels to be steered of the motor vehicle with a desired setpoint steering effect; a secondary steering level with a safety device that provides predefined functions so that if the primary steering level malfunctions, steering the wheels remains possible in an emergency mode until the motor vehicle is turned off; and an authentication system with a communications interface for communications with the safety device, wherein the authentication system is arranged such that after a successful authorization the secondary steering level is available also after the motor vehicle is turned off following the emergency mode.

14. The steer-by-wire steering system of claim 13 wherein the authentication system comprises a terminal for authentication.

15. The steer-by-wire steering system of claim 14 wherein the terminal is external and is connectable to the communications interface.

16. The steer-by-wire steering system of claim 14 wherein the authentication system is configured to check a key or a code that is input by way of the terminal.

17. The steer-by-wire steering system of claim 13 wherein the authentication system is configured to check a key or a code.

18. A steer-by-wire steering system for a motor vehicle comprising: a primary steering level with a steering transmission device, which is arranged to subject wheels to be steered of the motor vehicle with a desired setpoint steering effect; a secondary steering level with a safety device that provides predefined functions so that if the primary steering level malfunctions, steering the wheels remains possible in an emergency mode; and an authentication system with a communications interface for communications with the safety device, wherein the authentication system is arranged such that after a successful authorization the secondary steering level is available following the emergency mode, wherein an authentication method performed by the authentication system is combined with a location query.

19. The steer-by-wire steering system of claim 18 wherein the authentication system is configured so that specified locations for the location query are pre-approved.

20. The steer-by-wire steering system of claim 18 wherein the authentication system is configured so that specified geographic locations for the location query are pre-approved.

21. The steer-by-wire steering system of claim 18 wherein the authentication system is configured so that the location query is GPS-based.

22. The steer-by-wire steering system of claim 18 wherein the secondary steering level has an electrical form or an electronic form.

23. The steer-by-wire steering system of claim 18 wherein the communications interface is configured to be unidirectional.

24. The steer-by-wire steering system of claim 18 wherein the authentication system comprises a terminal for authentication.

25. The steer-by-wire steering system of claim 24 wherein the terminal is external and is connectable to the communications interface.

26. The steer-by-wire steering system of claim 24 wherein the authentication system is configured to check a key or a code that is input by way of the terminal.

27. The steer-by-wire steering system of claim 18 wherein the authentication system is configured to check a key or a code.

28. A terminal for authentication of the steer-by-wire steering system of claim 18.

Description

[0018] Preferred embodiments of the invention are described in detail below using the drawings. Similar or equivalent components are denoted in the figures with the same reference characters. In the figures:

[0019] FIG. 1: shows a schematic representation of a fault tolerant steer-by-wire steering system in the operating state,

[0020] FIG. 2: shows a schematic representation of the steer-by-wire steering system of FIG. 1 in the faulty state, and

[0021] FIG. 3: shows a schematic representation of the steer-by-wire steering system of FIG. 1 in which maneuverability is restored in the faulty state with a special key.

[0022] In FIG. 1, a motor vehicle 1 with a steer-by-wire steering device is represented, in which the driver controls the motor vehicle with a steering wheel 2 or the vehicle is controlled by means of an automatic program. During steering, the steering movement 3 is transmitted via a steering transmission device 4 to a mechanical actuation system 5, which subjects the wheels 6 to the desired setpoint steering effect via track rods. A safety device 7 with measurement lines and control lines 71, 72 forms the fallback level and enables fault redundancy.

[0023] In the case of a fault or a disruption 8 in the steering system, as shown in FIG. 2, the safety device 7 can provide certain functions, using which the vehicle can still be driven to the side of the road and stopped. However, it is conceivable and possible that even such functions can no longer be permitted for safety reasons or can no longer be displayed for technical reasons. Accordingly, the connection to the mechanical actuation system 5 is interrupted and the vehicle can no longer be maneuvered.

[0024] So that the vehicle remains maneuverable, an authentication system 9 is provided, using which safety functions can be bypassed and thus a mechanical coupling that was provided as a fallback level can be replaced by a direct electrical intervention, for example. The authentication system 9 comprises a communications interface to the steer-by-wire steering system of the motor vehicle and a terminal for authentication, for example a multifunction display or similar, which enables the input of a workshop key or a code. By means of the communications interface, the workshop key or the code can be transferred to the safety device 7 and can be analyzed there. In a different embodiment, the authentication system 9 can be used as a control unit for direct input of the steering movement that is transmitted to the mechanical actuation system 5. The authentication system 9 ensures that the steer-by-wire steering system is exclusively accessible only to a certain group of people. In a different embodiment, the workshop key or code is already stored in the terminal. Furthermore, it is conceivable that instead of a workshop key or code a different known authentication method can be used, such as biometric fingerprint systems for example.

[0025] To increase safety, a location query, for example by means of GPS location, can be additionally provided in the authentication system 9 or in the safety device 7. Locations can thus be pre-approved for the authentication system 9. It can thereby be provided that the approval can be carried out for a known geographic region in order to prevent misuse or theft. It is also conceivable to approve locations on request.

[0026] The steer-by-wire steering system can thus be reactivated by an authorized person skilled in the art. The still functional fallback level is thereupon set in a mode that enables driving the vehicle. For safety reasons, said transition state can be restricted to low vehicle speeds. In said mode, the vehicle can for example be carried on a tow truck by a recovery specialist or can be maneuvered by a mechanic in the workshop.

[0027] In the situation described above of a vehicle that is steered by means of steer-by-wire without a primary steering level, the fallback level, using which the vehicle was brought to a safe standstill, is still available. The present invention provides a technical solution as to how such a vehicle continues to remain maneuverable for authorized persons. This represents a significant simplification of the handling of a motor vehicle with a steer-by-wire steering system when towing, but also in the workshop.