Effects of Tire Rolling Resistance on Vehicle Fuel Consumption

1975 ◽  
Vol 3 (1) ◽  
pp. 3-15 ◽  
Author(s):  
W. B. Crum ◽  
R. G. McNall
Keyword(s):  
Fuel Consumption ◽  
Fuel Economy ◽  
Aerodynamic Drag ◽  
Rolling Resistance ◽  
Measurement Precision ◽  
Test Results ◽  
Control Measurement ◽  
Definition Of ◽  
And Control ◽  
Reliable Testing

Abstract Variation in the effects of tire rolling resistance on passenger car fuel consumption seldom exceeds ten percent. The definition of these effects is therefore a problem in experimental design and control, measurement precision, and careful accounting for uncontrolled variables. A rolling resistance test conducted on a road surface with a fully instrumented tire test trailer is described and the test results presented. Fuel “economy” test techniques are discussed with emphasis on precautions and recommendations for reliable testing and test results presented. When aerodynamic drag is taken into account with wind tunnel measurements, the results are suggestive of engine characteristic curves.

The Study of Fuel-Saving Technology of GSI

2014 ◽  
Vol 1070-1072 ◽  
pp. 392-397
Author(s):  
Jun Hui Xu ◽  
Ming Qiu Gao ◽  
Ji Qiang Gao ◽  
Xiang Bao
Keyword(s):  
Fuel Consumption ◽  
Fuel Economy ◽  
Rolling Resistance ◽  
Fuel Saving ◽  
Pressure Monitoring ◽  
Tire Pressure ◽  
Engine Efficiency ◽  
Tire Pressure Monitoring System ◽  
The Eu

In the background of the main technologies of fuel economy in automobiles developed to a certain stage, it is necessary to reduce fuel consumption and increase the engine efficiency by developing other auxiliary technologies such as improving the ratio of pure energy drive, low rolling resistance tires, tire pressure monitoring system and gear shift indicators (GSI). This article introduces the principle of GSI, analyses how GSI works in improving engine efficiency, and then evaluates the method for determination of the relative saving rate of fuel consumption, which method was introduced in the EU regulation EC No. 65/2012.

Method to Reduce Drag Coefficient for Fuel Efficiency in Semi-Truck Trailer and Trailer Stability

2018 ◽  
Author(s):  
Anu R. Nair ◽  
Fred Barez ◽  
Ernie Thurlow ◽  
Metin Ozen
Keyword(s):  
Drag Coefficient ◽  
Fuel Consumption ◽  
Aerodynamic Drag ◽  
Fuel Efficiency ◽  
Rolling Resistance ◽  
Ansys Fluent ◽  
Improve Fuel Efficiency ◽  
Area Of Interest ◽  
Streamlined Body ◽  
External Forces

Heavy commercial vehicles due to their un-streamlined body shapes are aerodynamically inefficient due to higher fuel consumption as compared to passenger vehicles. The rising demand and use of fossil fuel escalate the amount of carbon dioxide emitted to the environment, thus more efficient tractor-trailer design becomes necessary to be developed. Fuel consumption can be reduced by either improving the driveline losses or by reducing the external forces acting on the truck. These external forces include rolling resistance and aerodynamic drag. When driving at most of the fuel is used to overcome the drag force, thus aerodynamic drag proves an area of interest to study to develop an efficient tractor-trailer design. Tractor-trailers are equipped with standard add-on components such as roof defectors, boat tails and side skirts. Modification of these components helps reduce drag coefficient and improve fuel efficiency. The objective of this study is to determine the most effective geometry of trailer add-on devices in semi-truck trailer design to reduce the drag coefficient to improve fuel efficiency and vehicle stability. The methodology consisted of CFD analysis on Mercedes Benz Actros using ANSYS FLUENT. The simulation was performed on the tractor-trailer at a speed of 30m/s. The analysis was performed with various types of add-on devices such as side skirts, boat tail and vortex generators. From the simulation results, it was observed that addition of tractor-trailer add-on devices proved beneficial over modifying trailer geometry. Combination of add-on devices in the trailer underbody, rear and front sections was more beneficial in reducing drag coefficient as compared to their individual application. Improving fuel efficiency by 17.74%. Stability of the tractor-trailer is improved due to the add-on devices creating a streamlined body and reducing the low-pressure region at the rear end of the trailer.

Esso Energy Award Lecture, 1984 - A new tyre polymer improving fuel economy and safety

1985 ◽  
Vol 399 (1816) ◽  
pp. 1-24 ◽  
Keyword(s):  
Fuel Consumption ◽  
Fuel Economy ◽  
Dynamic Properties ◽  
Rolling Resistance ◽  
Road Surface ◽  
Vehicle Testing ◽  
Wet Grip ◽  
New Hypothesis ◽  
Tyre Industry

A new philosophy, relating to both rolling resistance (fuel consumption) and wet grip (safety), has been developed, based on measurements of the dynamic properties of tread compounds in the laboratory under conditions approaching those existing at the tyre-road surface interface under both rolling and wet sliding conditions. The generally accepted wet grip theories used throughout the tyre industry lead to the conclusion that when wet grip is improved, there is an increase in rolling resistance. The new philosophy enabled a tailor-made polymer to be developed that broke away from convention and gave a reduced rolling resistance while improving wet grip. Extensive laboratory and vehicle testing was performed on tyres made with the new polymer, to verify the new hypothesis and to ensure that the polymer was a commercial proposition before it was officially announced and introduced into commercial tyres during late 1981.

scholarly journals Current knowledge and attitudes of nurses: Technicians regarding hospital aquired infections

2021 ◽  
Vol 24 (82) ◽  
pp. 28-33
Author(s):  
Jelena Marjanović ◽  
Sanja Šumonja ◽  
Hajnalka Požar
Keyword(s):  
Nosocomial Infections ◽  
Work Experience ◽  
Healthcare Professionals ◽  
Preventive Measures ◽  
Current Knowledge ◽  
Test Results ◽  
Knowledge And Attitudes ◽  
Control And Prevention ◽  
Definition Of ◽  
And Control

Introduction: Intrahospital infections have a great impact on the mortality rate and morbidity of hospitalized patients. The importance of nosocomial infections makes it important for nurses to know and implement preventive measures during provision of nursing care. Objective: To analyze knowledge and attitudes of nurses about nosocomial infections. Material and methods: The research was conducted on a population of nurses and technicians employed at the General Hospital in Subotica. The sample included 44 participants. The research instrument was a questionnaire designed for the purposes of the research. Data were analyzed using descriptive statistics and hi-square test. Results: The definition of nosocomial infections was known to 68% of respondents, but only 50% of respondents knew that the hands of healthcare professionals were the most common way of spreading nosocomial infections. Basic preventive measures against nosocomial infections were familiar to 82% of respondents, and 95% of the respondents thought that nurses have important role in the control and prevention of nosocomial infections. Significantly more respondents who have more than 20 years of work experience thought that nurses do not have contribution in prevention and control of nosocomial infections (p=0.011). Conclusion: Most participants were familiar with the definition of nosocomial infections and basic preventive measures. It is necessary to improve the knowledge about the ways of spreading and the risks for the occurrence of nosocomial infections.

CFD Analysis of Aerodynamic Drag Reduction in Heavy Vehicles by Changing its Frontal Area: Techinical Note

2019 ◽  
Vol 11 (5) ◽  
Author(s):  
D. Hasen ◽  
S. Elangovan ◽  
M. Sundararaj ◽  
K.M. Parammasivam
Keyword(s):  
Fuel Consumption ◽  
Aerodynamic Drag ◽  
Fuel Efficiency ◽  
Rolling Resistance ◽  
Aerodynamic Performance ◽  
Frontal Area ◽  
Heavy Vehicles ◽  
Design Engineers ◽  
Ansys Cfx ◽  
Aerodynamic Drag Reduction

Nowadays, fuel efficiency of heavy vehicles became an ultimate issue to the manufacturing and design engineers. The best approach to reduce the fuel consumption is to improve the aerodynamic performance of vehicle. This can be achieved by reducing the drag, because drag coefficient is directly proportional with the fuel consumption. Design engineers trying to improve the heavy vehicle’s performance by manipulating various parameters such as engine parameters, weigh, rolling resistance and aerodynamic drag. In this project, efforts were made to increase the aerodynamic performance by changing the frontal area of the container. Computational analysis was carried out at various velocities (50km/hr, 60km/hr, and 70km/hr) by changing the frontal area of the container in heavy vehicles. Different truck geometries were done using CATIA V5 and the simulations were done using ANSYS CFX software. Results were obtained and comparative studies were made. As a result of comparisons between various designs, the cowl of 2h dimension shows better results in reducing the drag when compared with the other designs.

Design and Simulation of Power System for Hybrid Sweeper Truck

2013 ◽  
Vol 389 ◽  
pp. 435-440
Author(s):  
Bing Li Zhang ◽  
Lun Zhen Wang ◽  
Fu Bin Xiao ◽  
Xin Ying Ou
Keyword(s):  
Power System ◽  
Simulation Model ◽  
Fuel Consumption ◽  
Hybrid System ◽  
Fuel Economy ◽  
Control Strategy ◽  
Hybrid Power System ◽  
Hybrid Power ◽  
Simulation Results ◽  
And Control

A hybrid system scheme was designed for the sweeper truck, to solve the problems of high fuel consumption and poor emission performance of traditional sweeper. The control strategy was determined for the hybrid power system. The simulation model of hybrid sweeper truck was built with Matlab/Simulink, and off-line simulation was completed to verify the power system scheme and control strategy, the simulation results indicate that the hybrid sweep truck can realize functions of sweeper and improve the fuel economy.

Rolling resistance, vertical load and optimal number of wheels in human-powered vehicle design

2016 ◽  
Vol 231 (1) ◽  
pp. 33-42 ◽  
Author(s):  
Paolo Baldissera ◽  
Cristiana Delprete
Keyword(s):  
Aerodynamic Drag ◽  
Rolling Resistance ◽  
Resistance Coefficient ◽  
Optimal Number ◽  
Vehicle Design ◽  
Definition Of ◽  
Human Powered ◽  
The Relationship ◽  
Resistance Coefficients ◽  
Strict Definition

Even if it makes a smaller contribution than aerodynamic drag, rolling resistance plays a non-negligible role in the efficiency of human-powered vehicles, whether they are designed for daily commuting or to set speed records. The literature, experimental evidence and models show that the rolling resistance coefficient of cycling wheels strongly depends on the supported load, suggesting that the number of wheels and the load distribution could play a role in vehicle design and in road-test data analysis. Starting with an in-depth look at the relationship between a single wheel and overall vehicle rolling resistance coefficients, an analysis is proposed and discussed with the aim of minimizing the rolling resistance of a vehicle. Finally, a parametric surface response model for rolling resistance is obtained as a function of wheel size and the number of wheels. The overall analysis overturns the popular assumption according to which ‘the more wheels, the more rolling resistance’, at least according to a strict definition of the phenomenon.

scholarly journals Evaluation of Fuel Consumption in Road Freight Transport

2013 ◽  
Vol 16 (1) ◽  
pp. 18-21 ◽  
Author(s):  
Mário Szabó ◽  
Radoslav Majdan ◽  
Zdenko Tkáč ◽  
Rastislav Čápora ◽  
Ľubomír Hujo
Keyword(s):  
Fuel Consumption ◽  
Fuel Economy ◽  
Aerodynamic Resistance ◽  
Rolling Resistance ◽  
Freight Transport ◽  
Pressure Reduction ◽  
Inflation Pressure ◽  
Fuel Savings ◽  
Tyre Pressure ◽  
Road Freight

Abstract This paper deals with the importance of fuel economy in road freight transport. It provides the calculation of financial savings for fuel savings of 0.5 l per 100 km. In the subsequent part, some factors that influence the fuel consumption are specified, e.g. aerodynamic resistance, rolling resistance, and tyre inflation pressure. The effect of tyre inflation pressure on fuel economy has been tested on four selected towing vehicles. Based on the results obtained, it can be stated that tyre pressure has a great impact on fuel consumption. A one-bar pressure reduction of tyres can increase the fuel consumption by 0.5 l per 100 km.

scholarly journals Do Changes in Temperature and Inflation Pressure Affect Rolling Resistance during Road and Track Testing for Fuel Economy of Class 8 Tractor-Trailers?

2018 ◽  
Vol 46 (2) ◽  
pp. 93-104 ◽  
Author(s):  
L. J. Bachman
Keyword(s):  
Fuel Consumption ◽  
Fuel Economy ◽  
Rolling Resistance ◽  
Resistance Force ◽  
Inflation Pressure ◽  
Tire Pressure ◽  
Air Cavity ◽  
Warm Up ◽  
The Relationship ◽  
Resistance Tests

ABSTRACT Data from air cavity thermistors, tire pressure–monitoring systems (TPMS), and SAE J1269 rolling resistance tests were analyzed to evaluate the significance of changes in tire pressure on rolling resistance during fuel economy tests of class 8 tractor trailers. Thermistor data show that air cavity temperatures vary, with the main increase happening during the warm-up run and measurable cooling during the fuel measurement breaks between runs. Inflation pressure also increases by 50–70 kPa during the warm-up run, but once the tire has warmed up, the pressure is more stable, rarely varying by more than 20 kPa during a test run. Results of SAE J1269 rolling resistance tests allow estimation of rolling resistance force for any specified load and inflation pressure. Using the test weight of the truck, the rolling resistance force was estimated for inflation pressures ranging from 550 to 860 kPa. The relationship between the inflation pressure and rolling resistance was roughly linear. The relationship was then used to estimate changes in fuel consumption due to changes in inflation pressure normalized to the cold inflation pressure. For each change of relative inflation pressure of 5%, rolling resistance would change by about 1%. Using a common return factor of a 1% change in fuel consumption for every 5% change in rolling resistance, a change in relative inflation pressure of 5% would result in a change of fuel consumption of about 0.2%. The precision of the J1321 fuel economy tests was measured to be plus or minus about 1%. This suggests that the warm-up run provided for the test method stabilizes the tire pressure and rolling resistance and that interference due to changes in rolling resistance during a test run or between runs is a concern only for tests that measure small changes in fuel consumption. While the results obtained here are used to assess the effect of inflation pressure on the SAE J1321 test and apply only to the particular tires tested, the method of analysis may be useful in the assessment of the effect of over- or underinflated tires on fuel consumption in the wider long-haul trucking fleet.

Sign in / Sign up

Export Citation Format

Share Document