{"id":{"repo_id":"wvu","oai_identifier":"oai:researchrepository.wvu.edu:etd-2292"},"canonical_url":"https://search.dev.ndltd.org/etd/wvu/oai:researchrepository.wvu.edu:etd-2292","repository":{"repo_id":"wvu","name":"West Virginia University","base_url":"https://researchrepository.wvu.edu/do/oai/"},"display":{"title":"Characterization of infield duty cycles and exhaust emissions from diesel powered off-road heavy-duty equipment","abstract":"The objective of study was to design, develop, and evaluate techniques to measure exhaust emissions from diesel-powered off road equipment. Emissions data was collected from a Komatsu hydraulic excavator and a Caterpillar track-type tractor.;For the excavator, data was logged during in-field operation, and test cycles were created on a dynamometer test bed using this data. For the tractor, on-board emissions measurement equipment collected mass emissions rate data in field.;Vast differences were found between transient and 8-mode brake-specific test results. Transient cycle HC, CO, CO2, NO, and PM emissions were 50%, 65%, 10%, 35%, and 50% lower than 8-Mode results, respectively. Data collected from the tractor during a 360 second test was 5062 g/cycle CO2, 67.7 g/cycle NOx, and 0.349 g/cycle DPM.;The study concluded that exhaust emissions are vehicle and task specific in nature, and that 8-Mode test results lack the ability to realistically estimate actual in-use engine emissions.","abstract_html":"The objective of study was to design, develop, and evaluate techniques to measure exhaust emissions from diesel-powered off road equipment. Emissions data was collected from a Komatsu hydraulic excavator and a Caterpillar track-type tractor.;For the excavator, data was logged during in-field operation, and test cycles were created on a dynamometer test bed using this data. For the tractor, on-board emissions measurement equipment collected mass emissions rate data in field.;Vast differences were found between transient and 8-mode brake-specific test results. Transient cycle HC, CO, CO2, NO, and PM emissions were 50%, 65%, 10%, 35%, and 50% lower than 8-Mode results, respectively. Data collected from the tractor during a 360 second test was 5062 g/cycle CO2, 67.7 g/cycle NOx, and 0.349 g/cycle DPM.;The study concluded that exhaust emissions are vehicle and task specific in nature, and that 8-Mode test results lack the ability to realistically estimate actual in-use engine emissions.","abstract_has_math":false,"creators":["Rohrbaugh, Jeremiah Christopher"],"institution":null,"degree_name":"MS","degree_level":"Thesis","degree_discipline":"Mechanical and Aerospace Engineering","degree_department":null,"school":null,"contributors":["Mridul Gautam."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2002,"date_issued":"2002-12-01T08:00:00Z","date_published":"2002-12-01T08:00:00Z","updated_at":"2026-07-24T06:15:31Z","subjects":["Mechanical engineering","Environmental engineering"],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["https://researchrepository.wvu.edu/etd/1289"],"render_values":[{"text":"https://researchrepository.wvu.edu/etd/1289","href":"https://researchrepository.wvu.edu/etd/1289","code":true}]}]},"links":{"outbound_url":"https://doi.org/10.33915/etd.1289","outbound_label":"DOI","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Mridul Gautam."]},{"key":"dc:creator","label":"Author","values":["Rohrbaugh, Jeremiah Christopher"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.available","label":"Dc Date Available","values":["2019-01-17T08:00:00Z"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Mechanical and Aerospace Engineering"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["MS"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Mechanical engineering","Environmental engineering"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://doi.org/10.33915/etd.1289","https://researchrepository.wvu.edu/etd/1289"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["The objective of study was to design, develop, and evaluate techniques to measure exhaust emissions from diesel-powered off road equipment. Emissions data was collected from a Komatsu hydraulic excavator and a Caterpillar track-type tractor.;For the excavator, data was logged during in-field operation, and test cycles were created on a dynamometer test bed using this data. For the tractor, on-board emissions measurement equipment collected mass emissions rate data in field.;Vast differences were found between transient and 8-mode brake-specific test results. Transient cycle HC, CO, CO2, NO, and PM emissions were 50%, 65%, 10%, 35%, and 50% lower than 8-Mode results, respectively. Data collected from the tractor during a 360 second test was 5062 g/cycle CO2, 67.7 g/cycle NOx, and 0.349 g/cycle DPM.;The study concluded that exhaust emissions are vehicle and task specific in nature, and that 8-Mode test results lack the ability to realistically estimate actual in-use engine emissions."]},{"key":"dc:title","label":"Title","values":["Characterization of infield duty cycles and exhaust emissions from diesel powered off-road heavy-duty equipment"]}]}],"canonical_facts":{"dc:contributor":["Mridul Gautam."],"dc:creator":["Rohrbaugh, Jeremiah Christopher"],"dc:date.available":["2019-01-17T08:00:00Z"],"dc:description.abstract":["The objective of study was to design, develop, and evaluate techniques to measure exhaust emissions from diesel-powered off road equipment. Emissions data was collected from a Komatsu hydraulic excavator and a Caterpillar track-type tractor.;For the excavator, data was logged during in-field operation, and test cycles were created on a dynamometer test bed using this data. For the tractor, on-board emissions measurement equipment collected mass emissions rate data in field.;Vast differences were found between transient and 8-mode brake-specific test results. Transient cycle HC, CO, CO2, NO, and PM emissions were 50%, 65%, 10%, 35%, and 50% lower than 8-Mode results, respectively. Data collected from the tractor during a 360 second test was 5062 g/cycle CO2, 67.7 g/cycle NOx, and 0.349 g/cycle DPM.;The study concluded that exhaust emissions are vehicle and task specific in nature, and that 8-Mode test results lack the ability to realistically estimate actual in-use engine emissions."],"dc:identifier":["https://doi.org/10.33915/etd.1289","https://researchrepository.wvu.edu/etd/1289"],"dc:subject":["Mechanical engineering","Environmental engineering"],"dc:title":["Characterization of infield duty cycles and exhaust emissions from diesel powered off-road heavy-duty equipment"],"thesis:degree_discipline":["Mechanical and Aerospace Engineering"],"thesis:degree_level":["Thesis"],"thesis:degree_name":["MS"]},"updated_at":"2026-07-24T06:15:31Z"}