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Estimation of absolute wheel roll radii and estimation of vertical compression value

A technology of rolling radius and compression value, applied in the direction of brakes, tire measurement, vehicle components, etc., can solve the problems of error-prone system determination, errors, etc.

Active Publication Date: 2019-05-03
NIRA DYNAMICS AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the absolute wheel rolling radius is not known, this determination is error-prone and subject to systematic determination errors
Furthermore, this approach requires precise knowledge of nominal or reference values ​​for relative radius estimates

Method used

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  • Estimation of absolute wheel roll radii and estimation of vertical compression value
  • Estimation of absolute wheel roll radii and estimation of vertical compression value
  • Estimation of absolute wheel roll radii and estimation of vertical compression value

Examples

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Embodiment Construction

[0069] figure 1 A side view of the wheel 12a and the wheel 12b is schematically shown, wherein the nominal rolling radius 20r and the absolute rolling radius 22r are different.

[0070] In dashed lines, the geometry of the wheel 12a without load or deformation is shown as a shape 20 having a radius 20r and a center 20c. Generally, a wheel includes a tire and a rim on which the tire is mounted. In the absence of load and deformation, the wheel has a circular outer perimeter.

[0071] The radius 2Or of the wheel 12a may be referred to as the "nominal radius" of the tire or wheel. exist figure 1 , the nominal radius 20r is shown by a dashed line pointing vertically upward from the geometric center 20c of the wheel 12a.

[0072] Typically, due to static parameters (e.g. manufacturing tolerances of the tire and / or rim, even material distribution in the tire material, imperfections in the tire tread, etc.) Due to driving conditions such as air, friction, acceleration / decelerati...

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Abstract

Methods, apparatuses and computer program products for estimating absolute wheel roll radii and / or a vertical compression value of wheels of a vehicle are disclosed, wherein yaw rates of the vehicle,wheel speeds of first and second wheels, and optionally lateral acceleration of the vehicle are measured and used as a basis for the estimation.

Description

technical field [0001] The present invention generally relates to estimating a wheel roll radius of a wheel of a vehicle and estimating a vertical compression value of a wheel of a vehicle. Background technique [0002] For comfort and safety, cars include various monitoring and stability systems that detect and potentially control current driving characteristics, from the engine to the condition of the tires. Tire or wheel conditions such as pressure monitoring, loose wheel detection or tire stiffness determination are of particular concern because tires and wheels form the main contact points with the road and are subject to severe abrasive forces. [0003] Rolling radius estimation has become a valuable tool for monitoring tire or wheel condition. In particular, relative roll radius estimation aims to identify deviations from nominal or reference values. In contrast, absolute roll radius estimation aims to identify the actual absolute value of the roll radius. [0004]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C23/06B60W40/12B60W40/13B60T8/1755G01G19/08
CPCB60C23/061B60T8/17551G01G19/086B60T2240/06B60W40/12B60W2520/14B60W2520/28B60W2520/125B60W2520/10B60W2510/0657B60W2520/30B60W2520/26B60W2530/20B60W2510/182B60W2510/22B60W2552/40B60W2555/20B60W2556/50B60W40/13G01B21/12G01B21/32
Inventor 罗伯特·约翰逊
Owner NIRA DYNAMICS AB