# US 8,464,829 B2 · Method for operating a steering system

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- Number: US 8,464,829 B2
- Document ID: US8464829B2
- Status: Granted
- Kind: B2
- Application number: 13/186,980
- Filed: 2011-07-20
- Published: 2012-02-02
- Granted: 2013-06-18
- Earliest claimed: 2010-07-27
- Assignees: Dr. Ing. h.c. F. Porsche Aktiengesellschaft
- Applicants: Georg Von Tardy-Tuch; Daniel Lunkeit
- Inventors: Georg Von Tardy-Tuch; Daniel Lunkeit
- Web page: https://patentgrep.com/patent/US8464829B2

## CPC

- B62D 5/0466: {for returning the steering wheel to neutral position}
- 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 steering system and such a steering system are presented. The steering system includes a steering wheel which acts on a steering rack via a steering pinion of a steering column, wherein a steering torque is transmitted to the steering rack by means of the steering wheel. Furthermore, a steering assistance unit is provided, by means of which a steering assistance torque can be applied to the steering rack. A control circuit with which the steering assistance torque is regulated, is used, wherein the control circuit takes into account the mass inertia of the steering column.

## Claims

### Claim 1

A method for operating a steering system including a steering wheel which acts on a steering rack via a steering pinion of a steering column, said method comprising the steps of: (i) transmitting a steering torque to the steering rack by means of the steering wheel, (ii) calculating, by means of a control circuit, a steering assistance torque as a function of a mass inertia of the steering column, and (iii) applying the steering assistance torque to the steering rack by means of a steering assistance unit.

### Claim 2 (depends on 1)

The method as claimed in claim 1 further comprising the step of calculating the steering assistance torque as a function of a mass inertia of the steering assistance unit.

### Claim 3 (depends on 1)

The method as claimed in claim 1 further comprising the step of calculating the steering assistance torque as a function of a mass inertia of the steering wheel.

### Claim 4 (depends on 1)

The method as claimed in claim 1 further comprising the step of determining a manual torque of a driver.

### Claim 5 (depends on 1)

The method as claimed in claim 1 further comprising the step of observing an acceleration of the steering column.

### Claim 6

A steering system comprising:
a steering wheel which acts on a steering rack via a steering pinion of a steering column, wherein a steering torque is transmitted to the steering rack via the steering wheel,
a control circuit that is configured to calculate a steering assistance torque as a function of a mass inertia of the steering column, and
a steering assistance unit by means of which the steering assistance torque is applied to the steering rack.

### Claim 7 (depends on 6)

The steering system as claimed in claim 6, in which the steering assistance unit comprises an electric motor.