Method for estimating pavement peak attachment coefficients of distributed driving electric vehicle

Abstract

The invention relates to a method for estimating pavement peak attachment coefficients of a distributed driving electric vehicle. The method comprises the following steps of: acquiring a driving force signal, a longitudinal vehicle speed signal, a vehicle-mounted longitudinal acceleration sensor signal, and a wheel speed signal; estimating slip rate and utilization attachment coefficients in real time respectively by using the longitudinal dynamics and tire dynamics of the vehicle; transmitting an estimated slip rate value to a simplified tire model, so as to obtain utilization attachment coefficient estimation values of a group of different pavements; and comparing the utilization attachment coefficient estimation values with the utilization attachment coefficients of pavements, selecting a value with the minimum error, and solving a peak value by using the simplified tire model, so as to obtain the peak attachment coefficients. The method is simple in solving process, quick in operation, short in convergence time, high in robustness, and applicable to real-time estimation of the peak attachment coefficients of the various pavements in the running process of the vehicle.

Description

Technical field [0001] The invention relates to a method for estimating the peak adhesion coefficient of the road surface during vehicle driving (the peak adhesion coefficient of the road surface refers to the maximum value of the ratio of the longitudinal force to the vertical force of the tire under different slip rates), in particular to a Estimation method of road peak adhesion coefficient for distributed driving electric vehicles. Background technique [0002] Distributed electric drive vehicles install the drive motor in or near each wheel. It has the advantages of fast response, short transmission chain, efficient transmission, and compact structure. It makes full use of the characteristics of precise observation and fast controllability of the motor. It is an important development direction in the field of electric vehicles. [0003] The current driving force control system of distributed driving electric vehicles improves the adhesion ability of the vehicle and increases ...

AI Technical Summary

Problems solved by technology

[0005] Therefore, aiming at the inaccurate estimation of the existing road surface peak adhesion coefficient, the purpose of the present invention is to provide a method for estimating the road surface peak adhesion coefficient of distributed drive electric vehicles, which is used to accurately estimate the road surface conditions and improve the adhesion of the driving force control system. Control capability for safer driving

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