To provide a friction coefficient calculation device which can accurately calculate an estimation maximum value of a friction coefficient.SOLUTION: A friction coefficient calculation device for estimating an estimation friction maximum value μp includes: a calculation part 10 for calculating a slip rate and a friction coefficient; and a maximum friction estimation part 20 for calculating an estimation friction maximum value, using a tire brush model expression which has a plurality of parameters changing the inclination and calculates an estimation friction coefficient in which the slip rate is in a fine region, which is a function of slip rate of tire brush model, a calculation slip rate Sc and a calculation friction coefficient μc. The maximum friction estimation part includes: a model calculation part 21 for calculating a tire model friction μm; and a parameter estimation part 23 for estimating the values of the parameters. The parameter estimation part includes a parameter restriction part 232 which eliminates the value of the parameter in which the tire brush model expression becomes a linear function and a quadratic function, and determines the value of the parameter which can make the inclination of an inflection point of the tire brush model expression close to 0.SELECTED DRAWING: Figure 1
【課題】精度良く摩擦係数の推定最大値を算出可能な摩擦係数演算装置を提供すること。【解決手段】推定摩擦最大値μpを推定する摩擦係数演算装置は、スリップ率および摩擦係数を算出する演算部10と、タイヤブラシモデルのスリップ率に関する関数であって、傾きを変化させる複数のパラメータを有し、スリップ率が微小領域の推定の摩擦係数を算出するタイヤブラシモデル式と、算出スリップ率scおよび算出摩擦係数μcと、を用いて推定摩擦最大値を算出する最大摩擦推定部20と、を備える。最大摩擦推定部は、タイヤモデル摩擦μmを算出するモデル演算部21と、パラメータの値を推定するパラメータ推定部23とを有する。パラメータ推定部は、タイヤブラシモデル式が一次関数および二次関数となるパラメータの値を排除し、タイヤブラシモデル式の変曲点の傾きを0に近付けることを可能とするパラメータの値を求めるパラメータ制約部232を含む。【選択図】図1
FRICTION COEFFICIENT CALCULATION DEVICE
摩擦係数演算装置
2024-02-08
Patent
Electronic Resource
Japanese
IPC: | B60W CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION , Gemeinsame Steuerung oder Regelung von Fahrzeug-Unteraggregaten verschiedenen Typs oder verschiedener Funktion / G01M TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES , Prüfen der statischen oder dynamischen Massenverteilung rotierender Teile von Maschinen oder Konstruktionen |
European Patent Office | 2018
|European Patent Office | 2024
|ROAD SURFACE FRICTION COEFFICIENT CALCULATION DEVICE AND METHOD
European Patent Office | 2016
|Calculation of Average Coefficient of Friction During Braking
SAE Technical Papers | 1999
|