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Estimating the rack force in a steer-by-wire system

A technology of steering by wire and rack force, which is applied to steering mechanisms, steering rods, mechanical steering gears, etc. It can solve the problems of lack of precision, lack of consideration, and inability to predict rack force, so as to improve quality and steering feel , to ensure the predicted effect

Active Publication Date: 2019-11-01
THYSSENKRUPP PRESTA AG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This model has proven to be disadvantageous because it does not take into account other disturbing influences such as road conditions and therefore does not have the desired accuracy
Also, the rack force cannot be predicted if the gear is not moving and the rack force is in the range of stiction

Method used

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  • Estimating the rack force in a steer-by-wire system
  • Estimating the rack force in a steer-by-wire system
  • Estimating the rack force in a steer-by-wire system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0031] figure 1 A steer-by-wire system 1 is shown. Attached to the steering shaft 2 is a rotation angle sensor (not shown) which detects the driver's steering angle imparted by rotation of a steering input device 3, in the example in the form of a steering wheel. In addition, however, a steering torque can also be detected. The joystick can be used as a steering input device. Also attached to the steering shaft 2 is a feedback actuator 4 for simulating the reaction effect of the road 71 on the steering wheel 3 and thus providing feedback to the driver about the steering and driving characteristics of the vehicle. Such as figure 2As shown in , the driver's steering request is transmitted to the feedback actuator monitor unit 10 via the signal line by means of the rotation angle α of the steering shaft 2 measured by the rotation angle sensor. The feedback actuator monitor unit 10 communicates the driver's steering request to the control unit 60 . The feedback actuator moni...

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PUM

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Abstract

The invention relates to a method for determining a rack force (Fr, estcomplrack) for a steer-by-wire steering system (1) for a motor vehicle, wherein the rack force (Fr, estcomplrack) is determined from two components, wherein a first component of the rack force (Fr, estvehicle) is generated in a module for the vehicle model-based estimation of the rack force (15) by means of a vehicle model, anda second component of the rack force (Fr, estrack) is generated in a module for the steering-mechanism-model-based estimation of the rack force (16) by means of a steering-mechanism model.

Description

technical field [0001] The invention relates to a method having the features of the preamble of claim 1 for determining a rack force of a steer-by-wire system of a motor vehicle, and the invention relates to a method having the features of the preamble of claim 11 for controlling a steer-by-wire system and the invention relates to a steer-by-wire system having the features of the preamble of claim 13 . Background technique [0002] In steer-by-wire systems, the position of the steered wheels is not directly coupled to a steering input device such as a steering wheel. There is a connection between the steering wheel and the steered wheels by means of electrical signals. The driver's steering request is picked up by a steering angle sensor and the position of the steered wheels is controlled by means of the steering actuator in a manner dependent on the driver's steering request. No mechanical connection to the wheels is provided so that no direct force feedback is transmitt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B62D6/00
CPCB62D6/008B62D3/12B62D5/006B62D5/0463
Inventor 马努埃尔·罗尔莫泽
Owner THYSSENKRUPP PRESTA AG
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