Device and method for testing road surface peak attachment coefficient

Abstract

The invention discloses a device and method for testing a road surface peak attachment coefficient and belongs to the technical field of vehicle control. The method comprises the steps that 1, the car mass center accelerated speed ax, car speed v, wheel rotating speed wi, wheel cylinder pressure pi and driving torque Ti obtained by wheels are collected; 2, according to the accelerated speed ax, the state of a car is judged, the longitudinal force of the wheels is obtained, and the driving force or braking force of the wheels is calculated; 3, the slip rate of the wheels of the car is calculated according to car speed v and wheel rotating speed wi information; 4, the normal load of the wheels is calculated according to the accelerated speed ax; 5, the attachment coefficient (please see the formula in the description) is calculated according to the longitudinal force and normal load of the wheels; 6, according to the slip rate and attachment coefficient of the wheels, two approximate road surfaces R1 and R2 are selected from prestored calibration curves, and wheel attachment coefficients (please see the formula in the description) corresponding to the two approximate road surfaces and road surface peak coefficients mu1 and mu2 are obtained; 7, the approximation degree lambda of the approximate road surfaces is calculated; 8, the peak attachment coefficient mu max of the current road surface is calculated. The device and method are simple and effective, wide in application range and high in efficiency, and vehicles can be controlled well.

Description

technical field [0001] The invention belongs to the technical field of vehicle control, and relates to a method for testing road surface peak adhesion coefficient. Background technique [0002] Vehicle stability control technology is of great significance in ensuring the active safety of vehicles, and has become one of the research focuses in the automotive industry. The automobile tire-road adhesion coefficient can provide important information for maintaining the stability margin of the vehicle, and is an important reference for designing the parameters of the vehicle stability controller. It is one of the key technologies required for vehicle stability control to conduct real-time online observation of tire-road adhesion coefficient by vehicle-mounted sensors. When the coefficient of adhesion of the road surface is unknown, the performance of active safety systems usually cannot be fully utilized. If the road surface peak adhesion coefficient can be estimated in real ti...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of poor real-time performance, cumbersome calculation and low efficiency of existing road surface adhesion coefficient test methods, the present invention proposes a more concise and efficient road surface peak adhesion coefficient test method

Images