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

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 sometim...

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Published in:IOP conference series. Materials Science and Engineering 2018-09, Vol.421 (3), p.32017
Main Authors: Mańczak, R, Ślaski, G
Format: Article
Language:English
Subjects:
Air-fuel ratio
Coefficient of variation
Dispersion
Force measurement
Inspection
Stations
Subsystems
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description 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.
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subjects Air-fuel ratio
Coefficient of variation
Dispersion
Force measurement
Inspection
Stations
Subsystems
title The statistical dispersion of results of examination of selected vehicle subsystems tested in different technical inspection stations
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