EP3817966A1 - Verfahren zum lenken eines kraftfahrzeugs - Google Patents
Verfahren zum lenken eines kraftfahrzeugsInfo
- Publication number
- EP3817966A1 EP3817966A1 EP19730134.4A EP19730134A EP3817966A1 EP 3817966 A1 EP3817966 A1 EP 3817966A1 EP 19730134 A EP19730134 A EP 19730134A EP 3817966 A1 EP3817966 A1 EP 3817966A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- steering
- actuator
- force
- input values
- values
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D6/00—Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits
- B62D6/008—Control of feed-back to the steering input member, e.g. simulating road feel in steer-by-wire applications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/001—Mechanical components or aspects of steer-by-wire systems, not otherwise provided for in this maingroup
- B62D5/005—Mechanical components or aspects of steer-by-wire systems, not otherwise provided for in this maingroup means for generating torque on steering wheel or input member, e.g. feedback
Definitions
- the invention relates to a method for steering a motor vehicle and a system for steering a motor vehicle.
- a steering system for a motor vehicle is generally designed as an auxiliary steering system with a mechanical connection between a steering wheel as an operating element and a steering actuator of a mechatronic steering system, for example a steering gear. It is possible that actuating forces that act on the control element are influenced by the steering actuator. With such a steering system and / or such a steering system, safety objectives are or are provided, according to which both too low and too high actuation forces are to be avoided. The safety goals are set on the steering actuator due to the mechanical connection between the steering wheel and the steering gear.
- a manual power actuator sets an actuating force on the steering wheel in accordance with a total tie rod force and other boundary conditions, for example a steering wheel angle, a speed of the motor vehicle, etc.
- the safety goals with regard to the actuation forces also remain with the steer-by-wire system. If the steering actuator is still responsible for fulfilling these safety goals, the safety goals are transferred to, among other things, recording the Tie rod total forces, since fault detection can lead to impermissibly high or low hand forces on the steering wheel. Furthermore, the safety goals are transferred to the communication network between the steering actuator and the manual power actuator, which can result in technical and financial expenses.
- the publication DE 10 2009 048 092 A1 describes a control method for a steering system with electrical assistance.
- An electro-hydraulic steering system for a motor vehicle is known from the document DE 199 29 427 A1.
- a hydraulic steering system for a mobile machine is described in the document DE 10 2011 106 276 A1.
- the method according to the invention is intended for steering a motor vehicle with a steering system, the steering system having, for example, a manually operable control element or a manually actuable actuating element, a manual force actuator or manual force actuator, a steering actuator or steering actuator, at least one transmission element and a steering feel function ,
- the steering actuator is connected via the at least one transmission link to at least one steerable wheel of the motor vehicle, the
- Actuating element and the manual power actuator are mechanically connected to each other.
- operating values of a total transmission force which acts on the at least one transmission element, are transmitted to the steering feel function with the ones determined from the Operating values for the entire transmission force
- Input values of a manual force for the manual force actuator are determined.
- the input values are transmitted to a system function for limiting and / or plausibility checking of the input values and are compared by the system function with a predefined or defined maximum value for the actuating force and a predefined or defined minimum value for the actuating force.
- the system function determines output values for the manual force and predetermines the manual force actuator in response to the operating values for the total actuating force, the actuating or operating element being dependent on these initial values by the manual force actuator for the hand force is moved and a mechanical feedback or a mechanical feedback about a movement of the at least one wheel is provided to a driver of the vehicle.
- an input value and an output value resulting therefrom are set on the one hand at least or at least as large as the minimum value or a lower limit and on the other hand at most or at most as large as the maximum value or an upper limit.
- the hand force is kept above the lower limit and below the upper limit.
- the method is carried out for a steering system in which the at least one transmission link is designed as at least one tie rod between the steering actuator and the at least one wheel, with a total tie rod force acting on the at least one tie rod being determined as the total transmission force.
- the actuating or operating element is usually designed as a steering wheel.
- the steering actuator is usually assigned to a steerable axle of the motor vehicle, which as a rule has two steerable wheels which can be steered synchronously or individually.
- the steering actuator is connected to a wheel via a respective transmission link, ie, for example, via at least one transmission link, for example, a tie rod.
- a transmission force thus acts on at least one transmission member between each wheel and the steering actuator, from which in turn the total transmission force is determined.
- the steering actuator prefferably be assigned at least one sensor which is designed to determine a respective transmission force and thus also the entire transmission force.
- the method is carried out for a steering system which has a communication network which has at least one connection, for example a radio-based or wireless connection or a physical or wired line, with the manual power actuator and the steering actuator via the communication network Exchange of signals are interconnected.
- the communication network is usually provided as the only connection between the manual power actuator and the steering actuator.
- a mechanical connection via which forces could be transmitted is generally not provided here, which is why the method is intended for a steer-by-wire steering system.
- the system function and the steering feel function are carried out using software.
- the system according to the invention is designed for steering a motor vehicle with a steering system, the steering system having a steering wheel as a manual actuating element, an electromechanical manual power actuator, an electromechanical steering actuator, at least one mechanical transmission element and a steering function, the steering actuator being provided with the at least one transmission link is connected to at least one steerable wheel of the motor vehicle, the actuating element and the manual force actuator being mechanically connected to one another.
- This system has a system function for limiting and / or checking the plausibility of input values.
- operating values of a total transmission force which acts on the at least one transmission member, are transmitted to the steering feel function and / or can be transmitted, the steering feeling function being designed to derive input values from the determined operating values for the entire transmission force
- the input values being transmitted to the system function for limiting and / or making the input values plausible, or to be transmitted and / or to be transmitted.
- the system function is designed to compare the input values with a predefined or defined maximum value and a predefined or defined minimum value for the actuating force and thereby reduce input values that are greater than the maximum value to at least the maximum value or an upper limit and input values which are less than or less than the minimum value must be raised to at least the minimum value or a lower limit.
- the system function is also designed to determine output values for the manual force from the input values controlled, for example limited, by the system function and to predefine the manual force actuator, the manual force actuator being designed to move the actuating element depending on these initial values for the manual force, what can be felt manually by the driver.
- the system has a control unit in which the system function is implemented, the control unit being designed to perform or execute the system function.
- the steering feel function is implemented in the control device, the control device being designed to also perform the steering feel function.
- the functional architecture of the system function is proposed to meet the security goals. With this functional architecture, it is possible to use the system function to limit the input values to the output values and / or to check the plausibility of the input values at the end of a rule chain, the system function being designed to relate the set and / or predefined input values for the manual force with respect to a assess any violation of the security objectives. If the safety goals are exceeded, an operating parameter, in one embodiment the actuating force, is limited to a maximum possible value or the maximum value or an upper limit. If the safety targets and / or the actuating force, which usually acts on the steering wheel, are undershot, a corresponding reaction is also made and the manual force or the actuating force is kept above a lower limit and thus above a minimum possible value or minimum value.
- the steering system for a motor vehicle is an auxiliary steering system with an electrical connection, for example a line or radio-based connection, for exchanging signals between the steering wheel as an actuating or operating element and the steering actuator or steering actuator of the mechatronic steering system, which is usually a steering gear has trained.
- an electrical connection for example a line or radio-based connection
- the steering actuator or steering actuator of the mechatronic steering system which is usually a steering gear has trained.
- actuating forces which, starting from the manual force actuator or manual force actuator, act on the steering wheel as an operating element, the manual forces acting on the Act control element, are influenced by the steering actuator.
- safety objectives are provided, according to which both too low and too high actuation forces are to be avoided, which is possible with the method and system.
- the security objectives are set or set by the system function.
- signals are communicatively transmitted between the steering actuator and the actuating or operating element, wherein there is no mechanical connection between the steering actuator and the actuating or operating element for transmitting forces is.
- the manual force actuator is assigned to the actuating element.
- the steering actuator and the manual power actuator are connected to one another via the communication network in a wired or wireless manner, for example by radio. Via this communication network, for example, the tie rod total force detected by the steering actuator is communicated to the control unit as the total transmission force and, after its revision, to the manual force actuator in accordance with one embodiment of the method.
- the manual force actuator sets the manual force on the steering wheel as an actuating force that can be felt and / or felt manually by the driver due to a movement of the actuating element, which is usually designed as a steering wheel.
- the safety goals regarding the actuation forces can also be guaranteed for the steer-by-wire system. This prevents impermissibly high or low hand forces on the steering wheel.
- Figure 1 shows a schematic representation of an embodiment of the system according to the invention for performing an embodiment of the method according to the invention.
- FIG. 1 shows a schematic representation of a motor vehicle 2, of which a steerable axle 4 is shown here, to which wheels 6 are assigned.
- a steering actuator 8 or steering actuator is each via a tie rod 10 as
- FIG. 1 also shows a steering wheel 12 as an actuating element for a driver of motor vehicle 2, which is connected to a manual power actuator 14 or manual power actuator. Furthermore, the steering actuator 8 and the manual power actuator 14 are connected to one another via at least one line 16 as a connection of a communication network. It is provided here that the steering actuator 8, the tie rods 10, the steering wheel 12, the manual power actuator 14 and also the line 16 are designed as components of a steering system 18 of the motor vehicle 2 which is wired here.
- the embodiment of the system 20 comprises a control unit 22 and a further line 24 as a connection via which the control unit 22 is connected to the steering actuator 8. It is also possible that at least one of the components of the steering system 18 presented above is also formed as part of the system 20.
- a steering feel function 26 and a system function 28 are implemented in the control unit 22, with a characteristic map 30 for values, here for input values 32 and output values, in the system function 28 44, a hand force or steering force is implemented.
- This system function 28 is designed to limit input values 32 and / or to make the input values 32 plausible.
- operating values of a tie rod total force are determined as the total transmission force between the steering actuator 8 and the wheels 6 and are transmitted via the further line 24 from the steering actuator 8 to the steering feel function 26 and thus also to the control unit 22. It is provided that the steering feel function 26 from the determined operating values for the
- Tie rod total force Input values 32 for the manual force are determined, for example calculated, an input value 32 depending on the steering feel function 26 depending on the detected, for example sensor-measured, operating value of the tie rod total force as the total transmission force. The input values 32 continue to be sent to the
- the characteristic diagram 30 for the system function 28 here comprises an abscissa 34 along which the time is plotted and an ordinate 36 along which the input values 32 for the hand force are plotted. Since a plurality of operating values of the tie rod total force are determined during the operation of the steering system 18, and input values 32 for the manual force are in turn determined therefrom with the steering feel function 26, a curve 38 correspondingly results for a time course of the input values 32.
- the system function 28 is used. It is taken into account here that a minimum value 40 and a maximum value 42 for output values 44 of the manual force are provided and / or defined in the characteristic diagram.
- the input values 32 for the manual force are limited or limited taking into account the minimum value 40 and the maximum value 42.
- the original input values 32 become Output values 44 are provided, wherein a maximum output value 44 corresponds at most or at most to the maximum value 42 and a minimum output value 44 at least or at least corresponds to the minimum value 40.
- an input value 32 that is smaller than the minimum value 40 is raised to the minimum value 40.
- An input value 32 which is at least as large as the minimum value 40 and at most as large as the maximum value 42, is transmitted with the system function 28 directly and unchanged to an output value 44.
- the result is that output values 44 for the manual force are at least as large as the minimum value 40 and at most as large as the maximum value 42.
- the output values 44 are in turn transmitted from the control unit 22 via an additional line 46 as a connection to the manual force actuator 14.
- the manual force actuator 14 is acted upon and the steering wheel 12 is acted upon as feedback of the tie rod total force as the total transmission force for the driver of the vehicle 2.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Steering Control In Accordance With Driving Conditions (AREA)
- Power Steering Mechanism (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102018210916.8A DE102018210916A1 (de) | 2018-07-03 | 2018-07-03 | Verfahren zum Lenken eines Kraftfahrzeugs |
| PCT/EP2019/064836 WO2020007564A1 (de) | 2018-07-03 | 2019-06-06 | Verfahren zum lenken eines kraftfahrzeugs |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP3817966A1 true EP3817966A1 (de) | 2021-05-12 |
Family
ID=66826963
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19730134.4A Withdrawn EP3817966A1 (de) | 2018-07-03 | 2019-06-06 | Verfahren zum lenken eines kraftfahrzeugs |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US11738801B2 (de) |
| EP (1) | EP3817966A1 (de) |
| CN (1) | CN112424056B (de) |
| DE (1) | DE102018210916A1 (de) |
| WO (1) | WO2020007564A1 (de) |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19650475C1 (de) | 1996-12-05 | 1998-04-16 | Daimler Benz Ag | Fahrzeuglenkung |
| DE19907792C2 (de) * | 1999-02-24 | 2001-03-08 | Daimler Chrysler Ag | Regelungssystem |
| DE19929427A1 (de) | 1999-06-26 | 2000-12-28 | Bosch Gmbh Robert | Elektrohydraulisches Lenksystem für Kraftfahrzeuge |
| DE10107279A1 (de) * | 2001-02-16 | 2002-08-22 | Zahnradfabrik Friedrichshafen | Lenksystem |
| JP3935409B2 (ja) * | 2002-08-27 | 2007-06-20 | 富士重工業株式会社 | 電動式パワーステアリング装置 |
| DE102008021973A1 (de) * | 2008-05-02 | 2009-11-05 | Bayerische Motoren Werke Aktiengesellschaft | Fahrzeug- Lenksystem der by-wire-Bauart |
| DE102009048092A1 (de) | 2009-10-02 | 2011-04-07 | Thyssenkrupp Presta Ag | Sicherheitseinrichtung für elektrische Servolenkung |
| DE102011106276A1 (de) | 2011-07-01 | 2013-01-03 | Robert Bosch Gmbh | Hydraulische Lenkung |
| DE102016014294A1 (de) * | 2016-12-01 | 2018-06-07 | Thyssenkrupp Ag | Lenksystem für halbautonom und/oder autonom fahrende Kraftfahrzeuge mit einer Beweissicherungseinrichtung zur Aufzeichnung von Unfall-Daten |
| JP2019127237A (ja) * | 2018-01-26 | 2019-08-01 | 株式会社ジェイテクト | 操舵制御装置 |
| US11084526B2 (en) * | 2018-05-24 | 2021-08-10 | GM Global Technology Operations LLC | System for passively and actively monitoring and evaluating an electric power steering system |
| US20190367083A1 (en) * | 2018-05-29 | 2019-12-05 | Jtekt Corporation | Steering control apparatus |
-
2018
- 2018-07-03 DE DE102018210916.8A patent/DE102018210916A1/de not_active Withdrawn
-
2019
- 2019-06-06 EP EP19730134.4A patent/EP3817966A1/de not_active Withdrawn
- 2019-06-06 CN CN201980044897.9A patent/CN112424056B/zh active Active
- 2019-06-06 WO PCT/EP2019/064836 patent/WO2020007564A1/de not_active Ceased
- 2019-06-06 US US16/972,697 patent/US11738801B2/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN112424056B (zh) | 2023-04-04 |
| US20210253163A1 (en) | 2021-08-19 |
| DE102018210916A1 (de) | 2020-01-09 |
| WO2020007564A1 (de) | 2020-01-09 |
| US11738801B2 (en) | 2023-08-29 |
| CN112424056A (zh) | 2021-02-26 |
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