US 6,854,558 B2Granted

Overlay steering system and method for motor vehicles

AssigneeBayerische Motoren Werke Aktiengesellschaft

InventorsAxel Pauly, Goetz Baumgarten

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Abstract

An overlay steering system for a vehicle includes a mechanical steering apparatus for the transfer of a steering torsional moment at a predetermined transfer ratio to at least one steered wheel, a wheel angle sensor connected to at least one steered wheel for generating a wheel angle signal corresponding to an angle of the at least one steered wheel, a comparison device for comparing the steering angle signal and the wheel angle signal as well as for generating a comparison signal based on the steering angle and the wheel angle, and an electromechanical converter for generating the overlay torsional moment, if the comparison signal indicates the presence of a deviation from the predetermined relation between the steering angle and the wheel angle of the at least one steered wheel, resulting in a reduction of the deviation.

Claims23

Dependent claims

An overlay steering system for a motor vehicle comprising:

a mechanical steering apparatus for the transfer of a steering torsional moment with a predetermined transfer ratio to at least one steered wheel,
an overlay actuator between the steering apparatus and the at least one steered wheel for overlay of the steering torsional moment,
an overlay torsional moment in relation to a wheel torsional moment,
a steering angle sensor connected to the steering apparatus for generating a steering angle signal corresponding to an angle of the steering apparatus,
a wheel angle sensor connected to at least one steered wheel for generating a wheel angle signal that corresponds to an angle of the at least one steered wheel,
a comparison device for comparing the steering angle signal and the wheel angle signal and for the generation of a comparison signal based on the steering angle and wheel angle, and
an electromechanical converter for generating the overlay torsional moment, wherein the comparison signal indicates the presence of a deviation from the predetermined relation between the steering angle and wheel angle of the at least one steered wheel, resulting in a reduction of the deviation.

4 more elements

An overlay steering system for a motor vehicle comprising:

at least one steered wheel;
a steering apparatus for the transfer of a steering torsional moment with a predetermined transfer ratio to the steered wheel;
an overlay actuator disposed between the steering apparatus and the steered wheel for overlay of the steering torsional moment;
a steering angle sensor connected to the steering apparatus for generating a steering angle signal that corresponds to a steering angle of the steering apparatus;
a wheel angle sensor connected to the steered wheel for generating a wheel angle signal that corresponds to an angle of the steered wheel;
a comparison device connected to the steering angle sensor and the wheel angle sensor, the comparison device comparing the steering angle signal and the wheel angle signal to generate a comparison signal, wherein the comparison signal indicates the presence of a deviation from a predetermined relation between the steering angle arid the wheel angle;
and
an electromechanical converter connected to the comparison device and the overlay actuator, the electromechanical converter receiving the comparison signal and generating an overlay torsional moment on the basis of the comparison signal, wherein the overlay torsional moment is applied to at least one of the steering apparatus and steered wheel to reduce the deviation.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/106,830Filed 27 Mar 2002
Priority: DE 101 15 80230 Mar 2001
Published: US 2002/0157893 A131 Oct 2002
Granted: 15 Feb 2005
Term ends: Not estimatedThe source records don’t support an estimate.

Classification3 codes

B62D 6/002
Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits: computing…
B62D 5/008
Power-assisted or power-driven steering: changing the transfer ratio between the steering wheel and the steering gear by variable supply of…
B62D
Motor vehicles