The statistical dispersion of results of examination of selected vehicle subsystems tested in different technical inspection stations

International Automotive Conference 2018

Maczak, R.^1 ; laski, G.^1

Poznan University of Technology, Maria Sklodowska-Curie Square 5, Poznan

60-965, Poland^1

关键词: Air fuel ratios;    Coefficient of variation;    Statistical dispersion;    Test stands;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/421/3/032017/pdf
DOI  :  10.1088/1757-899X/421/3/032017

来源: IOP

【 摘 要 】

The paper presents results of an experiment taken to find out if the results of examination of selected subsystems performed in many technical inspection station (TIS) for the same car will be different and what will be a statistical dispersion of obtained results. Obtained results show that sometimes the results of examinations in different TIS stations are very different. For example, obtained coefficient of variation (CV) for results of braking force measurements has a value of around 20%, for EUSAMA coefficient obtained CV has value about 8% and for air-fuel ratio (λ) CV has a value over 60%. Some observations concerning also the correctness of examination procedures performed in tested TIS stations are presented in this paper. General conclusion for obtained results is that it is reasonable to require periodical technical inspections for test stands used in technical inspections stations.