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    A Boundary Lubrication Friction Model Sensitive to Detailed Engine Oil Formulation in an Automotive Cam/Follower Interface

    Source: Journal of Tribology:;2011:;volume( 133 ):;issue: 004::page 42101
    Author:
    Rupesh Roshan
    ,
    Martin Priest
    ,
    Anne Neville
    ,
    Ardian Morina
    ,
    Xin Xia
    ,
    Chris P. Warrens
    ,
    Marc J. Payne
    DOI: 10.1115/1.4004880
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: Theoretical studies have shown that in severe operating conditions, valve train friction losses are significant and have an adverse effect on fuel efficiency. However, recent studies have shown that existing valve train friction models do not reliably predict friction in boundary and mixed lubrication conditions and are not sensitive to lubricant chemistry. In these conditions, the friction losses depend on the tribological performance of tribofilms formed as a result of surface–lubricant additive interactions. In this study, key tribological parameters were extracted from a direct acting tappet type Ford Zetec SE (Sigma) valve train, and controlled experiments were performed in a block-on-ring tribometer under conditions representative of boundary lubrication in a cam and follower contact. Friction was recorded for the tribofilms formed by molybdenum dithiocarbamate (MoDTC), zinc dialkyldithiophosphate (ZDDP), detergent (calcium sulfonate), and dispersant (polyisobutylene succinimide) additives in an ester-containing synthetic polyalphaolefin (PAO) base oil on AISI E52100 steel components. A multiple linear regression technique was used to obtain a friction model in boundary lubrication from the friction data taken from the block-on-ring tribometer tests. The model was developed empirically as a function of the ZDDP, MoDTC, detergent, and dispersant concentration in the oil and the temperature and sliding speed. The resulting friction model is sensitive to lubricant chemistry in boundary lubrication. The tribofilm friction model showed sensitivity to the ZDDP–MoDTC, MoDTC–dispersant, MoDTC–speed, ZDDP–temperature, detergent–temperature, and detergent–speed interactions. Friction decreases with an increase in the temperature for all ZDDP/MoDTC ratios, and oils containing detergent and dispersant showed high friction due to antagonistic interactions between MoDTC–detergent and MoDTC–dispersant additive combinations.
    keyword(s): Friction , Temperature , Detergents , Plasticizers , Boundary lubrication , Tribological films , Engines AND Petroleum ,
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      A Boundary Lubrication Friction Model Sensitive to Detailed Engine Oil Formulation in an Automotive Cam/Follower Interface

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    http://yetl.yabesh.ir/yetl1/handle/yetl/147676
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    contributor authorRupesh Roshan
    contributor authorMartin Priest
    contributor authorAnne Neville
    contributor authorArdian Morina
    contributor authorXin Xia
    contributor authorChris P. Warrens
    contributor authorMarc J. Payne
    date accessioned2017-05-09T00:47:06Z
    date available2017-05-09T00:47:06Z
    date copyrightOctober, 2011
    date issued2011
    identifier issn0742-4787
    identifier otherJOTRE9-28786#042101_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/147676
    description abstractTheoretical studies have shown that in severe operating conditions, valve train friction losses are significant and have an adverse effect on fuel efficiency. However, recent studies have shown that existing valve train friction models do not reliably predict friction in boundary and mixed lubrication conditions and are not sensitive to lubricant chemistry. In these conditions, the friction losses depend on the tribological performance of tribofilms formed as a result of surface–lubricant additive interactions. In this study, key tribological parameters were extracted from a direct acting tappet type Ford Zetec SE (Sigma) valve train, and controlled experiments were performed in a block-on-ring tribometer under conditions representative of boundary lubrication in a cam and follower contact. Friction was recorded for the tribofilms formed by molybdenum dithiocarbamate (MoDTC), zinc dialkyldithiophosphate (ZDDP), detergent (calcium sulfonate), and dispersant (polyisobutylene succinimide) additives in an ester-containing synthetic polyalphaolefin (PAO) base oil on AISI E52100 steel components. A multiple linear regression technique was used to obtain a friction model in boundary lubrication from the friction data taken from the block-on-ring tribometer tests. The model was developed empirically as a function of the ZDDP, MoDTC, detergent, and dispersant concentration in the oil and the temperature and sliding speed. The resulting friction model is sensitive to lubricant chemistry in boundary lubrication. The tribofilm friction model showed sensitivity to the ZDDP–MoDTC, MoDTC–dispersant, MoDTC–speed, ZDDP–temperature, detergent–temperature, and detergent–speed interactions. Friction decreases with an increase in the temperature for all ZDDP/MoDTC ratios, and oils containing detergent and dispersant showed high friction due to antagonistic interactions between MoDTC–detergent and MoDTC–dispersant additive combinations.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleA Boundary Lubrication Friction Model Sensitive to Detailed Engine Oil Formulation in an Automotive Cam/Follower Interface
    typeJournal Paper
    journal volume133
    journal issue4
    journal titleJournal of Tribology
    identifier doi10.1115/1.4004880
    journal fristpage42101
    identifier eissn1528-8897
    keywordsFriction
    keywordsTemperature
    keywordsDetergents
    keywordsPlasticizers
    keywordsBoundary lubrication
    keywordsTribological films
    keywordsEngines AND Petroleum
    treeJournal of Tribology:;2011:;volume( 133 ):;issue: 004
    contenttypeFulltext
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