PIFFO - Piston Friction Force Measurements During Engine Operation

Koch, Franz; Geiger, Uwe; Hermsen, Franz-Gerd

doi:10.4271/960306

Cited by 32 publications

(24 citation statements)

References 4 publications

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“…In addition to the work referenced above on research into the measurement of total engine friction, a number of researchers have also investigated friction losses in individual engine components (such as valve trains [14][15][16][17][18][19][20][21][22] and the piston assembly [23][24][25][26][27][28][29][30] ).…”

Section: Mixed/boundary Friction In Different Engine Componentsmentioning

confidence: 99%

How much mixed/boundary friction is there in an engine — and where is it?

Taylor

Morgan

Mainwaring

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part J:

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Automotive engines are believed to operate predominantly in the hydrodynamic regime, as evidenced by the (1) the successful strategy of reducing lubricant viscosity to reduce engine friction and improve vehicle fuel consumption, and (2) for most engine operating conditions, direct measurements of engine friction (either motored or fired) find that engine friction increases with increasing engine speed. However, certain components in an engine are known to operate mainly in the mixed/boundary lubrication (e.g. the valve train) and other components (such as the piston rings) operate in the mixed/boundary regime for a portion of the time. In order to quantify the amount of mixed/boundary lubrication in an engine, and in the individual components of the engine, motored and fired friction tests have been carried out for a range of lubricants (of differing viscosity grade, and with/without friction modifier additives). A full discussion of the implications of this work, which includes the impact of fuel dilution and “running-in” is included with insights given into how the work reported here guides the development of future fuel-efficient engine lubricants.

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Section: Mixed/boundary Friction In Different Engine Componentsmentioning

confidence: 99%

How much mixed/boundary friction is there in an engine — and where is it?

Taylor

Morgan

Mainwaring

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…In road vehicles, many load-bearing contacting components in relative motion can contribute to frictional losses. The interfaces between piston rings/piston skirt and the cylinder liner have been found to have one of the largest contributions to engine frictional losses [6][7][8][9][10] amongst other friction losses due to valve trains, engine bearings and timing gears, chains, and other auxiliaries. Cylinder friction was reported to represent 40% to 55% of the total engine friction, which can be divided into contributions from the piston rings, the piston and the connecting rod.…”

Section: Introductionmentioning

confidence: 99%

A Critical Review of Approaches to the Design of Floating-Liner Apparatus for Instantaneous Piston Assembly Friction Measurement

et al. 2021

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Several approaches have been developed to measure instantaneous friction between the piston assembly and cylinder in internal combustion (IC) engines, such as floating-liner, reciprocating liner, instantaneous mean effective pressure (IMEP), fixed sleeve, and (P-ω) method and tribological bench tests. However, the “floating-liner method” and the “(IMEP) method” are the most common methods used to measure instantaneous friction between the piston assembly and IC engines. This paper critically evaluates different approaches to the design of the “floating-liner”. The paper begins by discussing piston assembly frictional losses and their significance and then discuss the development of instantaneous piston-friction measurements. After that, it reviews the main design challenges in the floating-liner approach. “Methods of cylinder sealing” and “force balancing methods” are also reviewed. Design challenges associated with firing operation were presented. Floating-liner designs were classified into different categories with a detailed presentation of the features of each. The paper ends by presenting a range of broad recommendations for further work which would benefit future designs.

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“…Various solutions have been presented, see e.g. (1,2,3) . Application of such floating liner engine for the measurement and analysis of liner offset engine designs is the topic of this paper.…”

Section: Introductionmentioning

confidence: 99%

Reduction of Friction Losses by Means of Cylinder Liner Offset in a Floating Liner Single Cylinder Engine

Winklhofer

Loesch

Satschen

et al. 2018

IJAE

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Piston to liner friction is responsible for a significant part (up to 50%) of total engine friction losses. Engine manufacturers use liner offset designs to address this issue and potentially reduce friction losses as is to be expected from theoretical considerations. A "floating liner" single cylinder engine was used to directly measure the effect of such liner offset design on the friction losses. Results show benefits to be gained at moderate speeds where cylinder pressure effects are the main drivers of piston to liner contact forces. At high engine speed this trend reverses due to piston inertia effects.

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PIFFO - Piston Friction Force Measurements During Engine Operation

Cited by 32 publications

References 4 publications

How much mixed/boundary friction is there in an engine — and where is it?

How much mixed/boundary friction is there in an engine — and where is it?

A Critical Review of Approaches to the Design of Floating-Liner Apparatus for Instantaneous Piston Assembly Friction Measurement

Reduction of Friction Losses by Means of Cylinder Liner Offset in a Floating Liner Single Cylinder Engine

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