# US 11,993,326 B2 · Adjustment of the steering feel subject to the steering speed > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,993,326 B2 - Document ID: US11993326B2 - Status: Granted - Kind: B2 - Application number: 17/269,034 - Filed: 2019-09-13 - Published: 2021-08-26 - Granted: 2024-05-28 - Earliest claimed: 2018-09-21 - Assignees: Thyssenkrupp Presta AG; thyssenkrupp AG - Applicants: thyssenkrupp Presta AG; thyssenkrupp AG - Inventors: Imre Szepessy - Web page: https://patentgrep.com/patent/US11993326B2 ## CPC - B62D 6/008: {Control of feed-back to the steering input member, e.g. simulating road feel in steer-by-wire applications} - B62D 5/0463: {calculating assisting torque from the motor based on driver input} - B62D: MOTOR VEHICLES; TRAILERS (steering, or guiding on a desired track, of agricultural machines or implements A01B69/00; wheels, castors, axles, increasing wheel adhesion B60B; vehicle tyres, tyre inflation or tyre changing B60C; connections between vehicles of a train or the like B60D; vehicles for use on rail and road, amphibious or convertible vehicles B60F; suspension arrangements B60G; heating, cooling, ventilating or other air treating devices B60H; windows, windscreens, non-fixed roofs, doors or similar devices, protective coverings for vehicles not in use B60J; propulsion plant arrangements, auxiliary drives, transmissions, controls, instrumentation or dashboards B60K; electric equipment or propulsion of electrically-propelled vehicles B60L; power supply for electrically-propelled vehicles B60M; passenger accommodation not otherwise provided for B60N; adaptations for load transportation or to carry special loads or objects B60P; arrangement of signalling or lighting devices, the mounting or supporting thereof or circuits therefor, for vehicles in general B60Q; vehicles, vehicle fittings or vehicle parts not otherwise provided for B60R; servicing, cleaning, repairing, supporting, lifting, or manoeuvring, not otherwise provided for, B60S; brake arrangements, brake control systems or parts thereof B60T; air-cushion vehicles B60V; motor-cycles, accessories therefor B62J, B62K; testing of vehicles G01M) ## Abstract A method for operating a motor vehicle steering system may involve generating a steering feel, with a steering force assistance or a countertorque that is introduced by a feedback actuator into a steering handle, in a manner that is dependent on a driver-side manual torque applied to the steering handle. The steering feel may be represented by way of a characteristic curve that is adapted in a manner that is dependent on steering speed in the case of steering speeds above 100°/s such that an adapted characteristic curve has a smaller maximum change of the gradient than the characteristic curve in the case of lower steering speeds. ## Claims ### Claim 1 A method for operating a steering system of a motor vehicle, the method comprising: generating a steering feel wherein a characteristic curve represents the steering feel; and adapting the characteristic curve based on a steering speed, wherein the characteristic curve is adapted for steering speeds above 150°/s such that an adapted characteristic curve has a smaller maximum change of gradient than the characteristic curve for steering speeds below 150°/s. ### Claim 2 (depends on 1) The method of claim 1 wherein the characteristic curve is adapted for steering speeds above 200°/s. ### Claim 3 (depends on 1) The method of claim 1 wherein the characteristic curve is adapted for steering speeds in a range from 200°/s to 300°/s. ### Claim 4 (depends on 1) The method of claim 1 wherein adapting the characteristic curve comprises resealing an X-axis. ### Claim 5 (depends on 1) The method of claim 1 wherein adapting the characteristic curve comprises resealing an X-axis in a region of a zero crossing of the characteristic curve. ### Claim 6 (depends on 1) The method of claim 1 wherein the characteristic curve and the adapted characteristic curve are base functions. ### Claim 7 (depends on 1) The method of claim 1 wherein the steering system is an electromechanical steering system, wherein the characteristic curve is a base torque curve or a steering column torque control curve. ### Claim 8 (depends on 1) The method of claim 1 wherein the steering system is a steer-by-wire steering system, wherein the characteristic curve represents dependence of a steering force assistance or a countertorque provided by a feedback actuator on a steering angle. ### Claim 9 (depends on 8) The method of claim 8 wherein adapting the characteristic curve comprises adding a constant. ### Claim 10 (depends on 9) The method of claim 9 wherein the constant depends on the steering speed. ### Claim 11 A steer-by-wire steering system for a motor vehicle, the steer-by-wire steering system comprising: a steering actuator that acts on steered wheels, that is regulated electronically based on a driver's steering request, and that acts on the steered wheels by way of a rack and pinion steering gear; and a feedback actuator that transmits feedback effects of a road to a steering wheel, the feedback actuator configured to provide a steering torque based on a steering angle by way of a first characteristic curve and a second characteristic curve, wherein the first characteristic curve is provided for higher steering speeds and the second characteristic curve is provided for lower steering speeds, with the first characteristic curve having a smaller maximum change of gradient than the second characteristic curve, wherein the first characteristic curve is calculatable by way of the second characteristic curve, and wherein calculating the second characteristic curve based on the first characteristic curve requires adding a constant. ### Claim 12 (depends on 11) The steer-by-wire steering system of claim 11, wherein the constant depends on steering speed. ### Claim 13 An electromechanical steering system for a motor vehicle, the electromechanical steering system comprising: a steering pinion that is connected to a lower steering shaft and is engaged with a rack that is mounted in a housing such that the rack is displaceable along a longitudinal axis, for steering wheels; and an electric motor for steering force assistance, wherein the steering force assistance is defined by a first characteristic curve and a second characteristic curve that are base torque curves or steering column torque control curves, wherein the first characteristic curve is provided for higher steering speeds and the second characteristic curve is provided for lower steering speeds, with the first characteristic curve having a smaller maximum change of gradient than the second characteristic curve, wherein the first characteristic curve is calculatable by way of the second characteristic curve by way of scaling an X-axis. ### Claim 14 (depends on 13) The electromechanical steering system of claim 13, wherein either the first and second characteristic curves are base torque curves and the X-axis is stretched, or the first and second characteristic curves are steering column torque control curves and the X-axis is compressed.