Abstract: In this paper, a distributed measurement and control system based on CAN/PCI bus is established for a dual-drum inertia test bench, which can be used to test and check vehicle security and power performance. Based on the designed inertia test bench, an algorithm for calculating the peak adhesion coefficients in different road conditions by changing the placement angle between wheel and dual drums is proposed. Based on dynamic analysis of single wheel during braking process, the dynamic model of single-wheel test bench system is established. According to the dynamic model, the equivalent adhesion mechanism of road adhesion with variable placement angle and peak adhesion coefficient is obtained. By Matlab/Simulink, the simulation model of single-wheel test bench system is built and the algorithm of equivalent road adhesion coefficient is verified. Through the designed single wheel-test bench system, the real-time longitudinal force and sliding rate of the wheel in small sliding area are obtained and the equivalent peak adhesion coefficient is estimated in real time based on Slip-slope theory. The results show the validity and feasibility of the proposed mechanism and the algorithm.

Key words: inertia test bench, variable placement angle, peak adhesion coefficient, equivalent adhesion mechanism