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Characterization of stick-slip condition in steering system

A steering system, stick-slip technology, applied to steering mechanisms, electric steering mechanisms, power steering mechanisms, etc., can solve problems such as increased steering force and reduced steering resistance

Active Publication Date: 2016-12-21
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although all types of EPS systems generally work well under most driving conditions, certain driving conditions may manifest themselves as a momentary phenomenon of a sudden increase in required steering effort followed by a sudden decrease in steering resistance

Method used

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  • Characterization of stick-slip condition in steering system
  • Characterization of stick-slip condition in steering system
  • Characterization of stick-slip condition in steering system

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0014] Referring to the drawings, wherein like reference numerals refer to like parts throughout the several views, figure 1 An exemplary steering test system 10 is schematically shown in FIG. The testing system 10 includes a steering system 20 of the type described above together with steering control hardware 40 and a controller (C) 50 programmed to use the control hardware 40 to execute the logic embodying the testing method 100 . Execution of the method 100 achieves the following reference to Figure 2A to Figure 3 The characterization of a steering stick-slip condition in the steering system 20 is further detailed.

[0015] The steering system 20 may embody an electrically assisted steering system of the type well known in the art, for example, a dual pinion electric power steering (EPS) as shown or alternatively a pinion EPS system or a column EPS system. thus, figure 1 The steering system 20 includes an elongated toothed rack 22 having a rack axis 17 , a first end 33...

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PUM

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Abstract

A method for characterizing a stick-slip condition in a steering system includes transmitting a periodic steering control signal to a rotary actuator to cause rotation of a steering shaft, through a torsion bar and inertia wheel, over a range of steering angles, and applying an axial force to a rack to resist rack displacement from a centered position. A steering torque output value is measured via a torque transducer. A control action is executed when a measured difference between a maximum value of a steering torque required to initiate rack motion / torque breakaway and a minimum value of the steering torque after breakaway for start-up or subsequent steering reversal exceeds a calibrated threshold. A system includes the rotary actuator, a steering system, a torque transducer, a torsion bar, an inertia wheel, a linear actuator(s) providing an axial force along the rack axis to resist rack displacement from a centered position, and controller programmed as noted above.

Description

technical field [0001] The present invention relates to the characterization of stick-slip conditions in steering systems. Background technique [0002] Automotive rack and pinion steering systems include an elongated spur gear or rack having teeth that mesh with mating teeth of a rotating pinion. The pinion is rotatably mounted on the steering shaft. When the steering angle is sent to the steering shaft by the rotation of the steering wheel, the pinion translates along the rack through engagement with the rack teeth. This in turn moves the rack in the corresponding steering direction. A tie rod disposed at the distal end of the rack is connected to the front wheel of the vehicle through a corresponding steering arm. Thus, a rack and pinion steering system efficiently converts rotational motion relative to the steering shaft into linear motion relative to the rack, while also providing a suitable level of gear reduction. [0003] In some designs, the steering function pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M17/06B62D5/04
CPCB62D5/0481B62D5/0409B62D5/0421B62D5/0457B62D5/0463B62D6/00G01M17/06
Inventor I·Y·华
Owner GM GLOBAL TECH OPERATIONS LLC