Influence of the road slope on NOx emissions during start up

Paúl Andrés Molina Campoverde, Néstor Diego Rivera Campoverde, Joselyn Elizabeth Morales Espinoza, Gabriel Moisés Rodriguez Fernandez, Gina Pamela Novillo

Research output: Contribution to journalConference articlepeer-review

4 Scopus citations


This paper has the purpose of estimating the NOx (Nitrous Oxides) emissions of vehicles equipped with ignition engines caused during the start-up of road slope. Studies currently carried out are scarce on driving right after start-up and its influence on NOx emissions. For the selection of the test route, the methodology proposed in the Real Driving Emission Test (RDE) was used, for which, there is a Data Logger device that acquires the data from the On Board Diagnostic port (OBD) and geolocation with the help of its Global Positioning System (GPS). Using the Random Forest technique, it is estimated that the most important variable in NOx production is engine revolutions. When the startup is carried out on road slopes ranging from 2.5% to 6.4%, there is an increase of 60.45% in NOx polluting emissions. In another situation, there is a decrease in the values of NOx polluting emissions by 87%, when the start-up occurs during the descent of road slopes in the range from -4.9% to -0.9%.

Original languageEnglish
Pages (from-to)8-15
Number of pages8
JournalMaterials Today: Proceedings
StatePublished - 2022
Event1st International Virtual Conference on Mechanical Engineering Trends, MET 2021 - Virtual, Online, Ecuador
Duration: 24 Mar 202126 Mar 2021

Bibliographical note

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© 2022 Elsevier Ltd. All rights reserved.


  • NOx
  • PEMS
  • RDE test
  • Road slope
  • Start up


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