Friction Modelling for Internal Combustion Engines

Dowson, D.; Taylor, C. M.; Yang, Lisheng

doi:10.1016/s0167-8922(08)70793-4

Cited by 12 publications

(11 citation statements)

References 14 publications

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“…This is done because simulation models for predictive wear calculations without a number of iterations are not available at the moment in practice which can guaranty sufficient accuracy compared to measurements. For inital engine design and layout stages, helpful design tools have been developed for friction modelling based on analytical and empirical component models to support the engineers e.g., in [9,10,29,30]. Without detailed informations regarding the increased friction losses of the valve train at gasoline engine 1 due to its different design one may come to the result, that the whole base engine shows disadvantageous friction performance.…”

Section: Overview Base Engine Friction Losses and Discussionmentioning

confidence: 99%

“…From literature detailed friction loss investigations on single cylinder engines are available [6][7][8]. Also a number of reasearchers have investigated the friction losses of passenger car engines both for gasoline [9][10][11] and diesel engines [12][13][14][15]. Furthermore, individual comparisons between modern diesel and gasoline engine friction losses focusing on lubricant sensitivities [16], a comparison of two gasoline engines for passenger car applications [17] and a comparison of two diesel engines for passenger car applications [18] are available in literature.…”

Section: Introductionmentioning

confidence: 99%

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Investigations of the Friction Losses of Different Engine Concepts. Part 2: Sub-Assembly Resolved Friction Loss Comparison of Three Engines

et al. 2019

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In this work, friction loss investigations and comparisons of three different four-cylinder engines for passenger car applications are presented, using a recently developed combined approach. By merging extensive experimental with reliable and predictive journal bearing simulation results, a sub-assembly-resolved friction loss analysis of the piston group, crankshaft journal bearings and valve train is conducted for all three engines. The engines have been chosen individually based on their specific power output and crank train geometry. The measurement program covers a wide range of corresponding engine operation points (identical speed, load and thermal boundary conditions). In addition, the investigations are carried out for different engine media supply temperatures ranging from 70 ∘ C to 110 ∘ C for a comprehensive consideration of the friction losses at reduced lubricant viscosity. For reasons of comparability, all investigations conducted in this work have been carried out using the same modern SAE 5W30 lubricant. This is done to exclude influences from different lubricant properties which may have significant effects on the tribological behaviour of the engines’ sub-assemblies. While the diesel engine showed a friction reduction potential over the entire engine operation range when increasing the engine media supply temperatures, the gasoline engines showed a different behaviour. For the gasoline engines, disadvantages arise especially at low engine speeds. By using the developed combined approach, it was possible to assign mixed lubrication regimes at the valve train systems and at the piston groups.

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Section: Overview Base Engine Friction Losses and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigations of the Friction Losses of Different Engine Concepts. Part 2: Sub-Assembly Resolved Friction Loss Comparison of Three Engines

et al. 2019

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“…His main interest and most of his contributions were in the tribology of biological systems, particularly in the endo-articular joints; the hip and knee (Section 2.3). However, he also contributed significantly to applications of EHL and hydrodynamic theories for the prediction of tribological conditions in internal combustion (IC) engines and other powertrain subsystems (such as gearing systems [11,52,53]), with the aim of improving their energy efficiency [54,55]. With regard to IC engines, Dowson conducted research in all the major tribological conjunctions, including cam-follower pairs, which are subject to EHL [56,57].…”

Section: Engine and Powertrainmentioning

confidence: 99%

Tribology and Dowson

2020

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It is with great sadness that we note the passing of Professor Duncan Dowson on 6th January 2020. Duncan was an esteemed member of the Editorial Board of this journal. He will be remembered as one of the founding fathers of tribology and as a true gentleman. He was the last living member of the Jost Committee, set up by the UK Government (1964–1966) to investigate the state of lubrication education and research, and to establish the requirements of industry in this regard [1]. This committee coined the term “tribology”.Duncan contributed to many areas of tribological research and established many of them, including elastohydrodynamic theory and biotribology.[...]

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“…Following detailed studies by Thring (1992) and Dowson et al (1996), the mean effective friction traction may be determined from: …”

Section: Latin American Journal Of Solids and Structures 13 (2016) 10mentioning

confidence: 99%

Experimentally Validated Combustion and Piston Fatigue Life Evaluation Procedures for the Bi-Fuel Engines, Using an Integral-Type Fatigue Criterion

Shariyat

Sola

Jazayeri

2016

Lat. Am. j. solids struct.

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A relatively complete procedure for high cycle fatigue life assessment of the engine components is outlined in the present paper. The piston is examined as a typical component of the engine. In this regard, combustion process and transient heat transfer simulations, determination of the instantaneous variations of the pressure and temperature in the combustion chamber, kinematic and dynamic analyses of the moving parts of the engine, thermoelastic stress analyses, and fatigue life analyses are accomplished. Results of the simulation are compared with the test data to verify the results. The heat transfer results are validated by the experimental results measured by the Templugs. The nonlinear multipoint contact constraints are modeled accurately. Results of the more accurate available fatigue criteria are compared with those of a fatigue criterion recently proposed by the first author. These results are also evaluated by comparing them with the experimental durability tests. The presented procedure may be used, e.g., to decide whether it is suitable to convert a gasoline-based engine to a bi-fuel one. Results of the various thermomechanical fatigue analyses performed reveal that the piston life decreases considerably when natural gas is used instead of gasoline.

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Friction Modelling for Internal Combustion Engines

Cited by 12 publications

References 14 publications

Investigations of the Friction Losses of Different Engine Concepts. Part 2: Sub-Assembly Resolved Friction Loss Comparison of Three Engines

Investigations of the Friction Losses of Different Engine Concepts. Part 2: Sub-Assembly Resolved Friction Loss Comparison of Three Engines

Tribology and Dowson

Experimentally Validated Combustion and Piston Fatigue Life Evaluation Procedures for the Bi-Fuel Engines, Using an Integral-Type Fatigue Criterion

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