Measurement of Piston Frictional Force in Actual Operating Diesel Engine

Furuhama, Shoichi; Takiguchi, Masaaki

doi:10.4271/790855

Cited by 92 publications

(25 citation statements)

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“…Piston friction forces were measured in order to estimate the piston lubrication eondition. In order to measure piston friction, the fioating liner method [2] was used. The floating liner method is a way of measuring piston friction forces, which was developed by Furuhama.…”

Section: Experimental Methodsmentioning

confidence: 99%

A Study of the Effects of Biofuel Use on Piston Lubrication During Fuel Post Injection in a Direct Injection Diesel Engine

Kikuhara

Shibata

Ito

et al. 2012

Journal of Engineering for Gas Turbines and Power

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The reduction of both exhaust gases and carbon dioxide emissions is necessaiy to meet future emissions regulations for diesel engines. Exhaust after-treatment devices are gradually being apptied to diesel engines to reduce exhaust gases. Diesel particulate filters (DPF), an after-treatment device for diesel engines, in some cases require fuel post injection for regeneration. Post injection is usually conducted at the midpoint of the expansion stroke, and therefore causes fuel adhesion to the cylinder wall. However, using biofuels in a diesel engine is an effective way of reducing carbon dioxide emissions. It is well known that biofuels are chemically unstable, but the effects of biofuels on piston lubrication condition have not been thoroughly studied. In this study, piston lubrication condition during post injection in a single cylinder DI diesel engine using biofuel was investigated. Piston and ring friction forces were measured under engine operating conditions by means of a floating liner device to investigate the lubrication condition of the piston and rings. Both light fuel oil and biofuel were used in the measurements, with rapeseed methyl ester (RMEj being used as the biofuel. Lubricating oil on the cylinder wall was also sampled under engine operating conditions, and the effect of post injection on fuel adhesion to the cylinder wall was analyzed. It was found that the effect of post injection on fuel adhesion to the cylinder wall was remarkable around the top dead center (TDC), and the fuel dilution rate reached approximately 90%. The results of the measurement of the piston friction forces showed that post injection caused an increase in the friction forces at the compression TDC (CTDC) in the cases of both RME and light fuel oil, and the friction forces at CTDC increased according to the delay of the post injection timing.

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Section: Experimental Methodsmentioning

confidence: 99%

A Study of the Effects of Biofuel Use on Piston Lubrication During Fuel Post Injection in a Direct Injection Diesel Engine

Kikuhara

Shibata

Ito

et al. 2012

Journal of Engineering for Gas Turbines and Power

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“…9 from Fig. 6 below serves as the frictional force F excluding each error factor from Fa in a formula (1). Fig.…”

Section: Test Conditionsmentioning

confidence: 99%

“…In this method, although the shape of the cylinder bore is different from that of a multi-cylinder engine which is desired to be actually evaluated, it is possible to measure the frictional force for each crank angle at each stroke. Tokyo City University has measurement technology developed for the purpose of reducing friction loss in engines, and it has also developed several types of measuring devices for the floating liner method [1][2][3]. Automobile development companies and component manufacturers also have the similar type of test equipment, and floating liner apparatus that uses three-component (triaxial) force sensors [4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Improvement in Accuracy of Piston Frictional Force Measurement Using Floating Liner Engine

2017

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The frictional force measuring method of a piston-piston ring cylinder system at engine operation condition by using floating liner method has some device structures, such as using plural one dimensional load cells (load washer) and six or eight three-component (triaxial) force sensors method. However, in some cases the qualitative and quantitative values of the measured data differed due to differences in the structure of the device, differences in settings and differences in the method of processing the measured data. This research described a typical device structure of the floating liner engine, and described the case of the operation data processing method of piston frictional force, the reproducibility of data, and the zero point of frictional force. Furthermore, by the combustion pressure seal method of the floating liner, it showed clearly that momentary swing back force occurs in a frictional force curve and considered the cause.

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“…as an example, researchers are working on the application of coatings, such as DLC and MoS2, surface modification and texturing (dimple) [4][5][6][7][8][9], as well as reducing the area of the piston skirt and lowering the tension of the piston ring pack. Methods for evaluating the benefits of friction reduction include the motoring test method [10], the indicator diagram method [11,12], the instantaneous Indicated Mean Effective Pressure method [13], and the floating liner method [14][15][16][17]. The floating liner method can measure the changes in frictional force based on load, speed, and temperature, which vary based on crank angle, as reported in many research papers.…”

Section: Solving Major Issuesmentioning

confidence: 99%

Research Trend of Friction Loss Reduction in Internal Combustion Engines

Mihara

2017

Tribology Online

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According to the International Energy Agency (IEA), it is predicted that internal combustion engines (ICEs) will function as important power sources for plug-in hybrid vehicles or hybrid electric vehicles until 2050. To improve ICE performance, the utilization of technology that is focused on reducing heat loss and friction loss is critical. To achieve friction reduction, the application of low-viscosity oil for pistons and the realization of lower coefficients of friction between piston rings and cylinders serve as effective boundary conditions. The application of these conditions generates high seizure resistance as well. Many research and evaluation studies have been performed using the single cylinder floating liner engine method. However, there are no engines for which a quantitative evaluation is possible, so the causes behind friction losses are difficult to determine, and a mechanical analysis is difficult to perform. In this study, the trend of power sources analyzed by the IEA, prediction of the reduction in the coefficient of friction in automobiles by the European research center, and the concepts of each engine sliding surface condition are introduced. In addition, the difficulty of quantitative evaluation is also described, and the importance of a standard for the floating liner engine is explained.

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Measurement of Piston Frictional Force in Actual Operating Diesel Engine

Cited by 92 publications

References 0 publications

A Study of the Effects of Biofuel Use on Piston Lubrication During Fuel Post Injection in a Direct Injection Diesel Engine

A Study of the Effects of Biofuel Use on Piston Lubrication During Fuel Post Injection in a Direct Injection Diesel Engine

Improvement in Accuracy of Piston Frictional Force Measurement Using Floating Liner Engine

Research Trend of Friction Loss Reduction in Internal Combustion Engines

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