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Victor W. Wong. Chiou, Casey (Casey Jianzhi) Massachusetts Institute of Technology. Department of Mechanical Engineering. Massachusetts Institute of Technology. Department of Mechanical Engineering 2013-10-24T17:33:12Z 2013-10-24T17:33:12Z 2013 2013 http://hdl.handle.net/1721.1/81596 858865075 Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2013. Cataloged from PDF version of thesis. Includes bibliographical references (p. 93-95). Diesel particulate filters (DPF) are devices that trap hazardous particulate matter from diesel engine exhaust in order to meet increasingly strict particle emissions regulations. Diesel exhaust particulates mainly include soot and ash. Soot, carbon particles derived from incomplete fuel combustion, can be oxidized into carbon dioxide after being trapped by the DPF through a catalytic heating process called regeneration. Ash, however, derived from metallic additives in the engine lubricant required for robust engine operation, is an incombustible material and remains within the DPF following regeneration. As ash accumulates over time, exhaust airflow through the filter becomes restricted and an engine backpressure results. Engine performance and fuel economy are reduced, requiring the DPF to be cleaned or replaced. While the detrimental effects of ash on DPF performance and therefore fuel economy can be illustrated and quantified, there is much to be understood about the specific factors that govern ash properties like distribution, permeability, and morphology. Several different parameters, such as engine operating conditions and DPF design, have been found to significantly impact ash characteristics, and the ultimate goal is to be able to control these parameters to reduce detrimental ash effects to a minimum and improve DPF service life and performance. This work addresses the source of ash directly and investigates the effect of lubricant additive chemistry on ash characteristics and DPF performance. Three lubricant formulations, that differ only in the type of additives present, are tested and compared using a controlled, accelerated DPF loading system. Filter pressure drop response and resulting ash property data collected using an array of experimental and analytical techniques show that very little difference exists between the tested oils of differing additive content. by Casey Chiou. S.M. 102 p. eng Massachusetts Institute of Technology M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/7582 Mechanical Engineering. Individual and synergistic effects of lubricant additive (Ca, Mg, Zn) combinations on ash characteristics and DPF performance Individual and synergistic effects of lubricant additive (Ca, Mg, Zn) combinations on ash characteristics and diesel particulate filters performance Thesis application/pdf false Publication unknown unknown <Publication xmlns="https://www.openaire.eu/cerif-profile/1.1/" id="370a9325-e744-4fd1-8e22-2c61bc791ba8"> <Type xmlns="https://www.openaire.eu/cerif-profile/vocab/COAR_Publication_Types">http://purl.org/coar/resource_type/c_1843</Type> <Language>eng</Language> <Title>Individual and synergistic effects of lubricant additive (Ca, Mg, Zn) combinations on ash characteristics and DPF performance</Title> <Subtitle>Individual and synergistic effects of lubricant additive (Ca, Mg, Zn) combinations on ash characteristics and diesel particulate filters performance</Subtitle> <PublishedIn> <Publication> </Publication> </PublishedIn> <PublicationDate>2013</PublicationDate> <Authors> <Author> <DisplayName>Chiou, Casey (Casey Jianzhi)</DisplayName> <Affiliation> <OrgUnit> </OrgUnit> </Affiliation> </Author> </Authors> <Editors> </Editors> <Publishers> <Publisher> <DisplayName>Massachusetts Institute of Technology</DisplayName> <OrgUnit /> </Publisher> </Publishers> <License>http://dspace.mit.edu/handle/1721.1/7582</License> <Keyword>Mechanical Engineering.</Keyword> <Abstract>Diesel particulate filters (DPF) are devices that trap hazardous particulate matter from diesel engine exhaust in order to meet increasingly strict particle emissions regulations. Diesel exhaust particulates mainly include soot and ash. Soot, carbon particles derived from incomplete fuel combustion, can be oxidized into carbon dioxide after being trapped by the DPF through a catalytic heating process called regeneration. Ash, however, derived from metallic additives in the engine lubricant required for robust engine operation, is an incombustible material and remains within the DPF following regeneration. As ash accumulates over time, exhaust airflow through the filter becomes restricted and an engine backpressure results. Engine performance and fuel economy are reduced, requiring the DPF to be cleaned or replaced. While the detrimental effects of ash on DPF performance and therefore fuel economy can be illustrated and quantified, there is much to be understood about the specific factors that govern ash properties like distribution, permeability, and morphology. Several different parameters, such as engine operating conditions and DPF design, have been found to significantly impact ash characteristics, and the ultimate goal is to be able to control these parameters to reduce detrimental ash effects to a minimum and improve DPF service life and performance. This work addresses the source of ash directly and investigates the effect of lubricant additive chemistry on ash characteristics and DPF performance. Three lubricant formulations, that differ only in the type of additives present, are tested and compared using a controlled, accelerated DPF loading system. Filter pressure drop response and resulting ash property data collected using an array of experimental and analytical techniques show that very little difference exists between the tested oils of differing additive content.</Abstract> <Access xmlns="http://purl.org/coar/access_right" > </Access> </Publication>