scholarly journals Assessing the Impact of the Change in the Tire Pressure on the Rolling Resistance and Fuel Consumption

2020 ◽  
Vol 14 (3) ◽  
pp. 100-106
Author(s):  
František Synák ◽  
Alica Kalašová
Keyword(s):  
Fuel Consumption ◽  
Rolling Resistance ◽  
Tire Pressure ◽  
The Impact

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.

Potential impact of active tire pressure management on fuel consumption reduction in passenger vehicles

2018 ◽  
Vol 233 (4) ◽  
pp. 961-975 ◽  
Author(s):  
Stefano d’Ambrosio ◽  
Roberto Vitolo
Keyword(s):  
Fuel Consumption ◽  
Working Conditions ◽  
Management Strategies ◽  
Rolling Resistance ◽  
Pressure Control ◽  
Inflation Pressure ◽  
Pressure Management ◽  
Tire Pressure ◽  
Vehicle Performance ◽  
Passenger Vehicles

Active tire pressure management, through an automatic, electro-pneumatic, central tire inflation system, is here proposed as a means of improving fuel consumption in passenger vehicles, as well as safety and drivability. A brief description of the active tire pressure control system, which has been set up at the Politecnico di Torino, is provided as a reference. Different strategies, aimed at reducing rolling resistance, through inflation pressure management, under specific vehicle working conditions, are then illustrated. The fuel benefits that can be achieved by adopting these strategies in passenger vehicles are studied by means of computer simulations using a proprietary software for vehicle performance and fuel consumption estimation. Coast-down coefficients, evaluated experimentally during deceleration tests on a closed track, are generally available at the reference tire pressure prescribed by the original equipment manufacturer of the vehicle. These fixed coefficients can then be used to describe the vehicle in simulation environments. LaClair’s relation, which illustrates the influence of tire inflation pressure on rolling resistance, has therefore been used to recalculate the coast-down coefficients as functions of the tire pressure. This has allowed fuel consumption simulations to be performed on the reference B-segment passenger car under different working conditions. In particular, the following pressure management strategies have been studied: adaptation of the inflation pressure to the vertical load, variation of the inflation pressure during tire warm-up, and adjustment of the inflation pressure, according to the average speed (urban/highway driving). The performed simulations have demonstrated that if the standard tire pressure is maintained, fuel consumption could be reduced by up to 2% in real-world driving; further advantages could be obtained by varying the target pressure as a function of the current working conditions of the vehicle.

scholarly journals Roughness-Induced Pavement–Vehicle Interactions

2015 ◽  
Vol 2525 (1) ◽  
pp. 62-70 ◽  
Author(s):  
Arghavan Louhghalam ◽  
Mehdi Akbarian ◽  
Franz-Joseph Ulm
Keyword(s):  
Fuel Consumption ◽  
Mechanistic Model ◽  
Rolling Resistance ◽  
Thermodynamic Quantity ◽  
Surface Characteristics ◽  
Density Parameter ◽  
Pavement Roughness ◽  
Power Spectral ◽  
Roughness Index ◽  
The Impact

Pavement roughness affects rolling resistance and thus vehicle fuel consumption. When a vehicle travels at constant speed on an uneven road surface, the mechanical work dissipated in the vehicle's suspension system is compensated by vehicle engine power and results in excess fuel consumption. This dissipation depends on both road roughness and vehicle dynamic characteristics. This paper proposes, calibrates, and implements a mechanistic model for roughness-induced dissipation. The distinguishing feature of the model is its combination of a thermodynamic quantity (energy dissipation) with results from random vibration theory to identify the governing parameters that drive the excess fuel consumption caused by pavement roughness, namely, the international roughness index (IRI) and the waviness number, w (a power spectral density parameter). It is shown through sensitivity analysis that the sensitivity of model output, that is, excess fuel consumption, to the waviness number is significant and comparable to that of IRI. Thus, introducing the waviness number as a second roughness index, in addition to IRI, allows a more accurate quantification of the impact of surface characteristics on vehicle fuel consumption and the corresponding greenhouse gas emissions. This aspect is illustrated by application of the roughness–fuel consumption model to two road profiles extracted from FHWA's Long-Term Pavement Performance database.

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.

Stochastic Analysis of Rolling Resistance Energy Dissipation for a Tractor-Trailer Model

2019 ◽  
Vol 2673 (11) ◽  
pp. 593-603 ◽  
Author(s):  
Seunggu Kang ◽  
Hasan Ozer ◽  
Imad L. Al-Qadi ◽  
Billie F. Spencer
Keyword(s):  
Analytical Solution ◽  
Fuel Consumption ◽  
Aerodynamic Drag ◽  
Rolling Resistance ◽  
Quarter Car Model ◽  
High Speeds ◽  
Road Roughness ◽  
Quantitative Manner ◽  
New Generation ◽  
The Impact

Rolling resistance because of road roughness is often the largest contributor to energy consumption in the environmental assessment of pavement life cycle. Although fuel consumption of passenger vehicles caused by roadway roughness is well studied, further research is needed for truck fuel consumption models utilizing mechanistic approaches. Existing models estimating trucks’ excess fuel consumption because of rolling resistance are based on empirical models or simplified mechanistic models such as the quarter car model. Such approaches may not fully capture the complex dynamic motion of a tractor-trailer. This study suggests a stochastic method utilizing the analytical solution based on a tractor-trailer model to calculate excess truck fuel consumption because of roughness and speed. The illustrative examples show that excess truck fuel consumption tends to increase nonlinearly with roughness; fuel consumption increases with speed but drops after 104 km/h (65 mph) because of a rapid increase in aerodynamic drag at very high speeds. The effect of new generation wide-base tires (NG-WBT) in lieu of the standard dual tire assembly was studied using the introduced model. Results indicate that NG-WBT reduced excess fuel consumption because of roughness by 11% and 8% at 56 km/h and 80 km/h (35 mph and 50 mph), respectively. Finally, Monte Carlo simulation was conducted at two speeds and the simulation results were in agreement with the analytical solution. The results from the developed model and the validation using illustrative examples confirm the impact of roughness and speed on truck fuel consumption in a quantitative manner.

On-Road Fuel Consumption Testing to Determine the Sensitivity Coefficient Relating Changes in Fuel Consumption to Changes in Tire Rolling Resistance

2013 ◽  
Vol 41 (1) ◽  
pp. 2-20 ◽  
Author(s):  
Calvin R. Bradley ◽  
Arnaud Delaval
Keyword(s):  
Fuel Consumption ◽  
Real World ◽  
Rolling Resistance ◽  
Sensitivity Coefficient ◽  
Fuel Savings ◽  
Passenger Vehicles ◽  
The World ◽  
Label Information ◽  
The Impact ◽  
Measured Sensitivity

ABSTRACT: Tire rolling resistance is one of the primary forces opposing motion on passenger vehicles. New regulations appearing around the world will provide information on tire rolling resistance to consumers. The linear relationship between fuel savings and rolling resistance has been previously demonstrated. Extensive testing in real-world driving conditions has validated previous models. The result is a measured sensitivity coefficient for North American usage, which relates the changes in vehicle fuel consumption of E10 gasoline to changes in rolling resistance. This sensitivity coefficient is shown to not be significantly different between a compact car, a medium-sized sedan, and a full-sized pickup truck. Results provide a simple and robust way for end consumers to predict the impact of tire choice on their fuel consumption and CO2 emissions using tire label information.

Light-Weight Tire Concept

1996 ◽  
Vol 24 (2) ◽  
pp. 119-131
Author(s):  
F. Lux ◽  
H. Stumpf
Keyword(s):  
Fuel Consumption ◽  
Automobile Industry ◽  
Rolling Resistance ◽  
Performance Standards ◽  
Light Weight ◽  
Production Methods ◽  
Lower Fuel Consumption ◽  
Material Resources ◽  
The Past ◽  
Tire Production

Abstract Current demands by the consumer, the automobile industry, and the environment have determined the basis of this investigation. In the past, the requirements—ever faster, ever sportier—were accepted as decisive parameters for the development of our study. In the future, rational and safety-related tire characteristics as well as environmental consciousness will increase, whereas purely performance-related parameters will diminish in their importance. Through our light-weight tire project, we have paved the way for future tire generations. The first priority is the minimal use of material resources; this means a reduction of materials and energy in tire production by using advanced design and production methods without sacrificing performance standards. This benefits the consumer—the final judge of all of our activities—by considerably reducing the rolling resistance, leading to lower fuel consumption. Further design targets include the improvement of rolling behavior and increased comfort by reducing tire weight, and therefore a reduction in unsprung masses on the vehicle.

Highly epoxidized soybean oil in replacement of mineral oil for high performance on silica-filled tread rubber compounds

2021 ◽  
pp. 009524432110290
Author(s):  
Leandro Hernán Esposito ◽  
Angel José Marzocca
Keyword(s):  
Soybean Oil ◽  
High Performance ◽  
Rolling Resistance ◽  
Wear Test ◽  
Mineral Oil ◽  
Epoxidized Soybean Oil ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Rubber Compound ◽  
The Impact

The potential replacement of a treated residual aromatic extract mineral oil (TRAE) by a highly epoxidized soybean oil (ESO) into a silica-filled styrene-butadiene rubber compound was investigated. In order to determine if ESO compounds performance are suitable for tread tire applications, processing properties cure and characteristics were evaluated. The impact of ESO amount on the silica dispersion was confirmed by Payne Effect. The presence of chemical or physical interactions between ESO and silica improves the filler dispersion, enabling the compound processability and affecting the cure kinetic rate. An adjusted rubber compound with 2 phr of ESO and 2 phr of sulfur presented the higher stiffness and strength values with lower weight loss from a wear test compared with TRAE compound at an equal amount of oil and curing package. Furthermore, wet grip and rolling resistance predictors of both compounds gave comparable results, maintaining a better performance and reducing the dependence of mineral oil for tire tread compounds.

scholarly journals Management of Chipping Operations in Polish Forests

2020 ◽  
Vol 3 (1) ◽  
pp. 56
Author(s):  
Arkadiusz Gendek ◽  
Monika Aniszewska ◽  
Witold Zychowicz ◽  
Tadeusz Moskalik ◽  
Jan Malaťák ◽  
...  
Keyword(s):  
Fuel Consumption ◽  
Travel Distance ◽  
Operating Efficiency ◽  
Site Location ◽  
Work Shift ◽  
Work Site ◽  
The Mean ◽  
The Impact ◽  
Machine Base

The aim of the research was to verify the impact of selected parameters on the efficiency and organization of chipper operations. The paper analyzes chipping operations in Polish forests with a focus on work site location, overnight chipper location, chipper workload per site, fuel consumption, and work shift duration, as all of these factors may affect operating efficiency. The mean chipper travel distance between sites during a shift ranged from 4.74 km to 9.5 km (chippers moved on average every other day). The mean work shift duration was 12.4 h. At the end of a shift, the chippers traveled on average from 4.2 km to 6.3 km to an overnight location. At the beginning of a workday, the chippers were dispatched to sites at a distance of 2.5 km to 4.0 km. The average fuel consumption of the forwarder-mounted chippers was 16 L/h and that of the truck-mounted chipper was 7.7 L/h. It was found that the following actions have a decisive influence on the effectiveness of the operation of the chippers: determination of the size of individual tasks and the deployment of successive forest areas, indication of the proper location of the machine base, and the method of accessing the forest area.

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