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Determination of maximum adhesion coefficient

An adhesion coefficient, maximum technology, applied in the direction of input parameters of external conditions, registration/indication of vehicle operation, instruments, etc., can solve problems such as loss of control of motor vehicles, wheel slip or yaw, danger, etc.

Active Publication Date: 2021-09-10
ZF FRIEDRICHSHAFEN AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the force to be transmitted between the wheel and the ground exceeds the maximum force that can be transmitted, the wheel is subject to slip or yaw and the end result is the risk of loss of control of the motor vehicle

Method used

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  • Determination of maximum adhesion coefficient
  • Determination of maximum adhesion coefficient
  • Determination of maximum adhesion coefficient

Examples

Experimental program
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Embodiment Construction

[0025] figure 1 Tire 100 on ground 105 is shown in side and top views. The ground 105 is here the surface that the tire comes into contact with. The floor 105 can be covered by an intermediate medium, for example an ice surface, a wet sheet, a slippery layer or the like. The intermediate medium is thus applied on the ground 105 and affects the surface properties of the ground 105 . The tire 100 is generally included by a wheel; however, in this description, the friction characteristics between the tire 100 and the ground 105 are mainly discussed, so in order to observe, for example, the driving characteristics of a motor vehicle, the tire 100 can be regarded as a synonym for a wheel.

[0026] Circumferential velocity 110 and longitudinal velocity 115 are marked in the side view. The longitudinal velocity 115 extends in a longitudinal direction 120 that is perpendicular to the axis of rotation of the tire 100 and generally parallel to the ground surface 105 . The difference...

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Abstract

The present invention relates to a tire (100) that rolls on the ground (105). The invention also relates to a method (600) for providing a maximum coefficient of adhesion between a tire (100) and the ground (105) on which the tire (100) rolls, the method comprising the steps of: obtaining the relative instantaneous slip rate at the ground (105); obtain instantaneous adhesion coefficient; form a tuple (410, 510) from slip rate and instantaneous adhesion coefficient; vary from a plurality of predetermined features based on the tuple (410, 510) A characteristic change curve (205, 305) is selected from the curves (205, 305), wherein these characteristic change curves (205, 305) respectively describe the adhesion characteristics of the tire (100) or the corresponding characteristic change curve slope; The selected characteristic curve (205, 305) determines the maximum adhesion coefficient; and provides the maximum adhesion coefficient.

Description

technical field [0001] The invention concerns the determination of the maximum adhesion coefficient indicating the maximum transmittable force between the tire and the ground. Background technique [0002] Motor vehicles travel on the ground. Ground here means the surface that the tire comes into contact with. Here, the ground can be covered by an intermediate medium, such as ice, a wet sheet, a slippery layer or the like. If there are longitudinal forces acting between one of the wheels and the ground, especially acceleration or braking forces, the peripheral speed of the wheels can differ from the speed of motion of the vehicle and result in longitudinal slip. If there is a lateral force acting on the wheel, such as when the vehicle is driving through a curve, the plane of rotation of the wheel does not coincide with its direction of motion and there is a slip angle. Lateral forces can act in both directions, and slip angles can occur on steered or non-steered wheels. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60T8/172
CPCB60T8/172B60T2210/12B60W2556/10B60W2552/40B60W40/064B60W40/068B60W2520/16B60W2520/26B60C11/246B60W2555/20G01N19/02G07C5/008B60T2240/03B60W40/12B60W50/14G07C5/0808B62D15/029B60W2556/45
Inventor 罗伯特·兹迪赫海因茨-约阿希姆·吉尔斯多夫福尔克尔·瓦格纳乌尔里克·迈尔拉拉·露特·特纳朱利安·金
Owner ZF FRIEDRICHSHAFEN AG
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