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Method for estimating a friction coefficient of a roadway by means of a motor vehicle, control device and motor vehicle

A technology for controlling equipment and friction values, applied in control devices, brakes, brake components, etc., and can solve problems such as inaccurate estimation

Active Publication Date: 2019-07-23
VOLKSWAGEN AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Camera-based methods have the disadvantage that they provide only partially valid values, since camera-based system estimates are very inaccurate
For this, however, estimates exist in advance of

Method used

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  • Method for estimating a friction coefficient of a roadway by means of a motor vehicle, control device and motor vehicle

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Embodiment Construction

[0022] The example explained subsequently relates to a preferred embodiment of the invention. In this exemplary embodiment, the described components of an embodiment each present a corresponding individual feature of the invention which can be considered independently of one another, which also respectively improve the invention independently of one another and can thus also be individually or differently The combinations shown are considered to be part of the invention. Furthermore, the described embodiments can also be supplemented by further features of the invention which have already been described.

[0023] The figure shows a motor vehicle 10 , which can be, for example, a motor vehicle, in particular a passenger car or a truck. Shown are front wheels 11 , rear wheels 12 , vehicle front 13 , control unit 14 , damper adjustment 15 for a front axle with front wheels 11 , for rear axle with rear wheels 12 The shock absorber adjustment device 16 , the slip adjustment devic...

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Abstract

The invention relates to a method for estimating a friction coefficient (30) of a roadway (24) by means of a motor vehicle (10), wherein a control device (14) of the motor vehicle (10) receives, froma traction control system (17), a first estimated value of a maximum horizontal force (28) that can be transmitted to the roadway (24) by means of a wheel (11) of the motor vehicle (10). The inventionprovides that the control device (14) receives, from a damper controller (15), a second estimated value of a wheel contact-patch force (26) of the wheel (11), and calculates the friction coefficient(30) as a vehicle-independent friction coefficient (30) on the basis of the estimated values from the wheel contact-patch force (26) and the horizontal force (28).

Description

technical field [0001] The invention relates to a method for estimating a friction value of a roadway with or from a motor vehicle. The method is carried out by a control device which is also part of the invention. Finally, a motor vehicle with a control device according to the invention also belongs to the invention. Background technique [0002] The estimation of the friction value of a roadway is described in DE 10 2009 041 566 A1. It follows from this that the knowledge or estimation of the friction value is useful in order to be able to operate a driving dynamics control system, for example a slip control system (ESC—Electronic Stability Control). According to this publication, friction value information is also ascertained based on map and location data. Furthermore, it is known to divide the estimation of friction values ​​into several categories. For the case in which the driver's driving style is responsible for operating the tires of the motor vehicle at the ad...

Claims

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Application Information

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IPC IPC(8): B60T8/172
CPCB60T8/172B60T2210/122B60T2210/36B60T2260/022B60T2260/06B60W2552/40B60W10/20B60W10/22B60W40/068B60W2720/26B60W2420/403
Inventor F.贝雷克
Owner VOLKSWAGEN AG