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Vehicle coast-down method as a tool for calculating total resistance for the purposes of type-approval fuel consumption

Šarkan B., Skrúcaný T., Semanová Š., Madleňák R., Kuranc A., Sejkorová M., Caban J.

Zeszyty Naukowe. Transport / Politechnika Śląska

2018

z. 98

161--172

A coast-down test is carried out in cases when there is a need for the exact expression of the forces acting on a road vehicle during its coast-down. These forces act mainly against the vehicle’s movement due to air and tyre rolling resistance. Knowledge of the course of these forces throughout the vehicle’s movement range is also a requirement when measuring fuel consumption with a roller performance dynamometer. The reason is that this device has to load the rollers by force or performance corresponding to the given vehicle, while testing it during various driving cycles. For approval purposes, the requirements for this type of test are described in the applicable regulations, i.e., UNECE Regulations No. 83 and No. 101, or the newly developed Worldwide Harmonized Light Vehicles Test Procedure (WLTP). Slovak Technical Standard STN 30 0556 also contains detailed procedures for carrying out the test. The authors of this paper have taken into account both types of technical regulations in order to conduct coast-down tests on chosen vehicles. The results are usable in terms of measuring fuel consumption on a roller dynamometer. Furthermore, the vehicle’s economic performance in normal operation mode can be also assumed with these results.

Analiza oporu toczenia kół jezdnych samochodu podczas jazdy po różnych nawierzchniach drogowych

Luty W., Zwierzyński M., Taryma S.

Prace Naukowe Politechniki Warszawskiej. Transport

2016

z. 112

247--259

W pracy została podjęta problematyka zmiany oporu toczenia kół jednych samochodu w zależności od typu nawierzchni drogowej. Przeprowadzono badania eksperymentalne samochodu ciężarowego podczas jazdy po różnych nawierzchniach drogowych. Podczas badań wyznaczano charakterystyki wybiegu pojazdu. Na podstawie utworzonych charakterystyk wybiegu wyznaczono długości drogi wybiegu oraz uśrednione wartości współczynnika oporu toczenia kół pojazdu. Oceniono wpływ typu nawierzchni drogowej na uzyskane wartości współczynnika oporu toczenia kół pojazdu oraz wynikające z tego zmiany zużycia paliwa.

The paper shows the issue of changing the rolling resistance of the car wheels depending on the type of road surface. The experimental study was performed on a truck whilst driving on different road surfaces. During the research vehicle coast-down characteristics have been created. Based on established vehicle coast-down characteristics were estimated the length of the road and average values of rolling resistance coefficient of the wheels. It was estimated how big had been the influence of the type of road surface on the received values of the coefficient of rolling resistance of the vehicle wheels and changes of the fuel consumption.