Method for estimating road adhesion coefficient according to on-line modified automobile state parameter

A technology for road adhesion coefficient and state parameters, applied in the field of automotive active safety systems, can solve problems such as filter divergence, inaccurate models, and complex tire models, and achieve the effects of improving online estimation accuracy, solving high costs, and reducing usage.

Inactive Publication Date: 2015-02-18
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
View PDF5 Cites 28 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the mathematical model does not match the actual physical process very well, and the tire model is complex, in the process

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for estimating road adhesion coefficient according to on-line modified automobile state parameter
  • Method for estimating road adhesion coefficient according to on-line modified automobile state parameter
  • Method for estimating road adhesion coefficient according to on-line modified automobile state parameter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0028] The present invention will be further described below in conjunction with accompanying drawing.

[0029] In order to achieve accurate multi-parameter estimation, start from the real-time adjustment of model parameters, and continuously feed back the estimation results to the initial model to make the model relatively more accurate, better prevent nonlinear filtering from diverging, and improve estimation accuracy.

[0030] Specific steps include:

[0031] In the car turning driving condition, the algorithm is as follows:

[0032] Lateral Dynamics Model:

[0033] ma y = ( k 1 + k 2 ) β + ( ak 1 - bk 2 ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention provides a method for estimating a road adhesion coefficient according to an on-line modified automobile state parameter. The method comprises the following steps: carrying out on-line identification on related parameters; transmitting a modified parameter to a state estimator; feeding back an estimation value obtained through the state estimator to a parameter modification part; then estimating the cornering force of a tire according to the estimation value, the identified parameter values and signals obtained through all sensors; transmitting the estimation result to a road adhesion coefficient estimator; finally, estimating the road adhesion coefficient; feeding back the result to a cornering force estimating module, thereby enabling the estimation result to be more accurate. The method adopts a parameter real-time modification function during the state estimation process, and feeds back the estimation value for re-modification, so that the problem of high filter divergence possibility during the state estimation process due to error caused by linearization of a non-linear model is solved, on-line renewal and modification of model parameters are realized, self-adaption of the estimation effect can be realized, and on-line estimation accuracy can be improved.

Description

technical field [0001] The invention relates to the field of automobile active safety systems, in particular to a method for estimating road surface adhesion coefficient by using online corrected automobile state parameters. Background technique [0002] With the growing of China's auto industry and the substantial increase in car ownership, more and more casualties are caused by traffic accidents in my country every year, and more and more people pay attention to the safety of cars. In recent years, automobile safety has also been developed rapidly. The active safety system of automobiles is mainly guaranteed by different electronic control systems. For example, the anti-lock brake system (ABS) can ensure that the car can stop safely in the shortest distance during emergency braking, and ensure that the steering wheels do not lose their steering ability; The electronic stability program (ESP) can keep the car on the expected driving track and avoid serious accidents such a...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): B60W40/064
CPCB60W40/064
Inventor 谷霄月赵万忠王春燕
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap