Compensation of inertia error in brake dynamometer testing

Abstract

Loss in terms of air resistance and bearing friction is an important origin of inertia error that must be compensated in brake dynamometer testing, the acquisition of which has always been a troublesome problem. An indirect method of loss measurement using the speed data under zero pipeline pressure is described in this paper. A mathematical model of the resistance torque or the energy loss is calculated by regression of the collected speed data using statistical software. Error compensation of the two inertia-simulating methods, namely the torque control method and the energy compensation method, is discussed. Experiments using the former method are conducted on an NT11 brake dynamometer, which proves this method to be effective in eliminating inertia error.

Models of Two-Axle Driving Vehicle Used for Dynamometer Test Bench

“…When doing a performance test on DTB, the control system get kinetic solutions of vehicle's every drive axles through model of vehicle with considering the current vehicle driving situation and current road conditions. Then control system controls dynamometer motors to load under test bench simulation technology (Electrical inertia simulation) to make the real dynamic process of driving axles match the calculated kinetic solutions [7][8][9]. And this is the reason that the different model of vehicle causes the different result of simulation on DTB.…”