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.

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 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.

Influence of Inflation Pressure of a Tire on Rolling Resistance and Fuel Consumption

2017 ◽  
Author(s):  
Arthur Braga Thiriet ◽  
Fabrício José P. Pujatti ◽  
Paulo César S. Araújo
Keyword(s):  
Fuel Consumption ◽  
Rolling Resistance ◽  
Inflation Pressure

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 Effect of water ballast levels in the rear tires on tractor performance using disc plough on heavy clay soil: تأثير مستويات وزن الماء في العجلات الخلفية على أداء الجرار باستخدام المحراث القرصي في أرض طينية ثقيلة

2020 ◽  
Vol 4 (2) ◽  
Author(s):  
Omar Alnoor Ali Mohammed Zain
Keyword(s):  
Fuel Consumption ◽  
Clay Soil ◽  
Block Design ◽  
Rolling Resistance ◽  
Resistance Force ◽  
Randomized Block Design ◽  
Heavy Clay ◽  
Draft Force ◽  
Spss Software ◽  
And Training

This experiment was carried out at Masaad Center Farm for Technology Transfer and Training in Al-Gezira State in Sudan on heavy clay soil with a moisture content of 15.41%. To evaluate the effect of three levels of water ballast in the rear tires 25%, 50% and 75% and the effect of three different plowing depths 10, 15 and 20 cm with pressure constant (25 psi) in the rear tires. It was linked with disc plough of three discs. The split plot was used with three replications according to Randomized Block Design (RBD). The results were statistically analyzed using SPSS software. Rolling resistance force, draft force and fuel consumption were highly significantly affected (on 1% level) by the addition of different water ballast levels and tillage depth. The slippage ratio decreased by 15% when increasing the level of water ballast from 25% to 75% at a depth of tillage 15 cm. The rolling resistance increased by 43%, when increasing the water ballast levels from 25% to 75% at a depth of 20 cm. The water ballast levels increased from 25% to 75% at the depth of 10 cm the draft force was increased by 22%. Fuel consumption increased by 26%, when increasing the water ballast levels from 25% to 75% at the depth of tillage of 20 cm. The study showed that the addition of 75% water ballast level in the rear tires improves the performance of the tractor. The study showed that when the water ballast levels increased the fuel consumption, rolling resistance force and draft force were increased and slippage was decreased. As the depth of tillage increased, the slippage, fuel consumption, rolling resistance force and draft force were increased.

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