{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,4]],"date-time":"2026-06-04T11:21:25Z","timestamp":1780572085610,"version":"3.54.1"},"reference-count":33,"publisher":"MDPI AG","issue":"17","license":[{"start":{"date-parts":[[2021,8,27]],"date-time":"2021-08-27T00:00:00Z","timestamp":1630022400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IJERPH"],"abstract":"<jats:p>Nitrogen oxides are considered significant pollutants because of their effects on ecosystems and human health. The amount of NOx emitted by internal combustion engines can be reduced, mostly by acting on the conditions in which combustion takes place, respectively by lowering the peak flame temperature, reducing the excess of oxygen, etc. The homogeneous charge compression ignition (HCCI) engine represents a new technology that can simultaneously reduce NOx emissions and fuel consumption. This article presents these benefits of the HCCI engine by comparing the emissions and fuel consumption of a monocylinder engine when it is operated in a conventional way, with spark ignition, with those obtained when the engine is running in the HCCI mode. Moreover, since engine simulation has become an important tool for investigating the HCCI process and for developing new control strategies for it, this was used in this study to determine the effects of the exhaust gas recirculation on the combustion quality, respectively, on emissions.<\/jats:p>","DOI":"10.3390\/ijerph18179075","type":"journal-article","created":{"date-parts":[[2021,8,29]],"date-time":"2021-08-29T21:45:16Z","timestamp":1630273516000},"page":"9075","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Important Contributions to Reducing Nitrogen Oxide Emissions from Internal Combustion Engines"],"prefix":"10.3390","volume":"18","author":[{"given":"Daniela Laura","family":"Buruiana","sequence":"first","affiliation":[{"name":"Interdisciplinary Research Centre in the Field of Eco-Nano Technology, Advance Materials CC-ITI, Faculty of Engineering, \u201cDunarea de Jos\u201d University of Galati, 47 Domneasca, 800008 Galati, Romania"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Adrian","family":"Sachelarie","sequence":"additional","affiliation":[{"name":"Faculty of Mechanical Engineering, \u201cGheorghe Asachi\u201d Technical University of Iasi, 61\u201363 Mangeron Blvd, 700050 Iasi, Romania"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Claudiu","family":"Butnaru","sequence":"additional","affiliation":[{"name":"Faculty of Mechanical Engineering, \u201cGheorghe Asachi\u201d Technical University of Iasi, 61\u201363 Mangeron Blvd, 700050 Iasi, Romania"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3650-1021","authenticated-orcid":false,"given":"Viorica","family":"Ghisman","sequence":"additional","affiliation":[{"name":"Interdisciplinary Research Centre in the Field of Eco-Nano Technology, Advance Materials CC-ITI, Faculty of Engineering, \u201cDunarea de Jos\u201d University of Galati, 47 Domneasca, 800008 Galati, Romania"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2021,8,27]]},"reference":[{"key":"ref_1","unstructured":"WHO (2021, May 25). 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