Tag Archives: vehicle

533–539 H. Marušková and K. Pluhař
Quantitative research SME and STK in the Czech Republic
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Quantitative research SME and STK in the Czech Republic

H. Marušková* and K. Pluhař

Czech University of Life Sciences Prague, Faculty of Engineering, Department of
Vehicles and Ground Transport, Kamýcká 129, CZ 165 21 Prague 6, Czech Republic
*Correspondence: maruskova@tf.czu.cz

Abstract:

The article deals with the emission control stations (SME) and technical inspection stations (STK) in the Czech Republic. The increasing number of vehicles and their operational age has significant impact on these stations. The nowadays situation in the both stations does not react adequately to the changing conditions. The use of quantitative research, which was conducted through an Internet poll in September 2015, obtained responses from SME and STK staff, as well as from the public. The questionnaire didn’t show substantial dissatisfaction with the current controls on SME and STK and there is no urgent need for immediate and major changes, but rather the need for continuous improvement and better control on SMEs, at least as at STK, i.e. the introduction of a central information database (preferably shared by STK and SME) and a camera system for better control. The cardinal question is not whether the existing emission checks on vehicles in no-load mode of the engines are able to detect all faults.

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1601-1608 M. Hruška and P. Jindra
Ability to Handle Unfamiliar Systems in Passenger Cars According to Driver Skills
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Ability to Handle Unfamiliar Systems in Passenger Cars According to Driver Skills

M. Hruška¹* and P. Jindra²

¹Czech University of Life Sciences, Faculty of Engineering, Department of Technological Equipment of Building, Kamýcká 129, CZ 16521 Praha 6, Czech Republic
²Czech University of Life Sciences, Faculty of Engineering, Department of Vehicles and Ground Transport, Kamýcká 129, CZ 165 21 Praha 6, Czech Republic
*Correspondence: jabko@tf.czu.cz

Abstract:

This paper addresses the ability of drivers to intuitively control special passenger car systems that they have as yet not encountered in the course of their driving practice and therefore have no experience of them. The study described in this paper was conducted on a sample group of drivers without any prior experience of the tested model or of any other model of the same brand, and the functions and systems selected for testing were unique for the brand and model in question. The reason for conduction of this study was the endeavour to recreate the common situation in which a driver is forced to drive a car with whose controls he/she has not yet had the opportunity to become acquainted. Based on statistical evaluation of the obtained data, it proved that the initial hypothesis claiming the existence of a correlation between driver parameters such as age, gender or length and quality of driver experience and his/her ability to adapt to completely unknown car control systems could be confirmed. The results in this paper may be applied in the cabin and car control system design process, thereby enhancing the user-friendliness of passenger car controls, thereby also indirectly increasing road traffic safety.

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1332-1341 M. Kotek, P. Jindra and J. Mařík
Speed limits and their impact on emissions production and fuel consumption
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Speed limits and their impact on emissions production and fuel consumption

M. Kotek, P. Jindra* and J. Mařík

Czech University of Life Science Prague, Faculty of Engineering, Department of Vehicles and Ground Transport, Kamýcká 129, CZ16521 Prague, Czech republic
*Correspondence: jindrap@tf.czu.cz

Abstract:

The article deals with emissions and fuel consumption of road vehicles in real traffic conditions. The aim of this study was to prove or disprove correctness of the decision of Prague city government to change the speed limits from 70 km h-1 to 50 km h-1 on the parts of one main road leading to/from Prague. For measurements in real traffic conditions was used 2 typical Czech cars Skoda with manual transmission (Fabia 1.2 MPI with petrol engine and Octavia 2.0 TDI with diesel engine). Measurements were performed on both of directions on defined road segment.

At speed 50 km h-1 the measurement was repeated 5 times at 3rd and 5 times on 4th gear. Similarly at speed 70 km h-1 the measurement was repeated 5 times at the 4th and 5th gear. The aim was to operate the vehicle in the normal engine loads.
The results demonstrate the fundamental assumption that at the higher allowed vehicle speed the engine is more loaded and therefore produces a higher amount of emissions, but according to a higher vehicle speed the emissions are produced on the defined segment for the shorter time. A similar trend is evident even in fuel consumption. The results also indicate the depending on the power reserve of specific vehicle. When the vehicle is more powerful, higher permitted speed is preferable.

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