# US 11,299,194 B2 · Steer-by-wire system and method for operating a steer-by wire system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,299,194 B2 - Document ID: US11299194B2 - Status: Granted - Kind: B2 - Application number: 16/642,889 - Filed: 2018-07-05 - Published: 2020-11-05 - Granted: 2022-04-12 - Earliest claimed: 2017-09-05 - Assignees: Volkswagen Aktiengesellschaft - Applicants: Volkswagen Aktiengesellschaft - Inventors: Johannes Maria Schäfer - Web page: https://patentgrep.com/patent/US11299194B2 ## CPC - B62D 5/0457: {characterised by control features of the drive means as such} - B62D 5/0463: {calculating assisting torque from the motor based on driver input} - B62D 5/006: {power actuated} - B62D 6/008: {Control of feed-back to the steering input member, e.g. simulating road feel in steer-by-wire applications} - B62D 15/025: {Active steering aids, e.g. helping the driver by actively influencing the steering system after environment evaluation (B62D1/28 takes precedence)} - 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 The invention relates to a steer-by-wire system, that includes a steering mechanism, a sensor for detecting a driver request, a steering control device, power electronics, an electric servomotor, a steering rack that can be moved by the servomotor and an actor for generating a feedback torque (MFF) at the steering mechanism as a function of a steering rack position, wherein the steering control unit is configured in such a way so as to subtract, based on the feedback torque (MFF), at least a portion from a driver request determined based on sensor data, and a method for operating a steer-by-wire system. ## Claims ### Claim 1 A steer-by-wire system, comprising: a steering mechanism; a sensor for detecting a steering request; a steering rack, configured to be moved by a servomotor; and an actor for generating a feedback torque (MFF) at the steering mechanism as a function of a changeable steering rack position, a steering control unit, configured to detect requirements (FAS) of a driver assistant system, determine a hand torque and the generated feedback torque, and subtract at least a portion of feedback torque (MFF) from the hand torque (MH) from the steering request to reduce haptic feedback on the steering mechanism. ### Claim 2 (depends on 1) The steer-by-wire system according to claim 1, wherein the subtraction occurs before or after a driver assistance function. ### Claim 3 (depends on 1) The steer-by-wire system according to claim 1, wherein the requirements (FAS) are configured to change a steering angle. ### Claim 4 (depends on 3) The steer-by-wire system according to claim 3, wherein changes (φFAS) to the steering rack position due to requirements (FAS) are subtracted for the determination of the feedback torque (MFF). ### Claim 5 (depends on 1) The steer-by-wire system according to claim 1, wherein the steering control unit is configured to detect requirements (FAS) by a driver assistant system. ### Claim 6 (depends on 5) The steer-by-wire system according to claim 5, wherein the requirements (FAS) comprise a reset torque (MFASAs) that is subtracted from the hand torque (MH) by the steering control unit. ### Claim 7 A method of operating a steer-by-wire system, comprising: detecting, via a sensor, a steering request at a steering mechanism; generating, via an actor, a feedback torque (MFF) at the steering mechanism as a function of a changeable steering rack position; detecting, via the steering control unit, requirements (FAS) of a driver assistant system; determining, via a steering control unit, a hand torque and the generated feedback torque, (MFF); and subtracting, via the steering control unit, at least a portion of feedback torque (MFF) from the hand torque (MH) from the steering request to reduce haptic feedback on the steering mechanism. ### Claim 8 (depends on 7) The method according to claim 7, wherein the subtraction occurs before or after a driver assistance function. ### Claim 9 (depends on 7) The method according to claim 7, wherein the requirements (FAS) are configured to change a steering angle. ### Claim 10 (depends on 9) The method according to claim 9, wherein changes (φFAS) to the steering rack position due to requirements (FAS) are subtracted for the determination of the feedback torque (MFF). ### Claim 11 (depends on 7) The method according to claim 7, further comprising detecting, via the steering control unit, requirements (FAS) by a driver assistant system. ### Claim 12 (depends on 11) The method according to claim 11, wherein the requirements (FAS) comprise a reset torque (MFASAs) that is subtracted from the hand torque (MH) by the steering control unit. ### Claim 13 A method of operating a steer-by-wire system, comprising: detecting, via a sensor, a steering request at a steering mechanism of a driver-assisted system; detecting, via a steering control unit, requirements (FAS) of the driver-assisted system; generating, via an actor, a feedback torque (MFF) at the steering mechanism as a function of a changeable steering rack position; determining, via the steering control unit, a hand torque and the generated feedback torque, (MFF); and subtracting, via the steering control unit, at least a portion of feedback torque (MFF) from the hand torque (MH) from the steering request to reduce haptic feedback on the steering mechanism. ### Claim 14 (depends on 13) The method according to claim 13, wherein the subtraction occurs before or after a driver assistance function. ### Claim 15 (depends on 13) The method according to claim 13, wherein the requirements (FAS) are configured to change a steering angle. ### Claim 16 (depends on 15) The method according to claim 15, wherein changes (φFAS) to the steering rack position due to requirements (FAS) are subtracted for the determination of the feedback torque (MFF). ### Claim 17 (depends on 13) The method according to claim 13, further comprising detecting, via the steering control unit, requirements (FAS) by a driver assistant system. ### Claim 18 (depends on 17) The method according to claim 17, wherein the requirements (FAS) comprise a reset torque (MFAS) that is subtracted from the hand torque (MH) by the steering control unit.