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Impact of low NOx strategies on holistic emission reduction from a CI engine over transient conditions

van Niekerk, Adriaan; Drew, Benjamin; Larsen, Neil; Kay, Peter

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Authors

Benjamin Drew Benjamin.Drew@uwe.ac.uk
Senior Lecturer in Mechanical & Motor Sport Engineering

Neil Larsen Neil.Larsen@uwe.ac.uk
AHOD in Mechanical and Aerospace

Peter Kay Peter2.Kay@uwe.ac.uk
AHOD in Mechanical and Automative



Abstract

The use of biofuels to replace fossil fuels as well as more stringent emission regulations for internal combustion engines cause a challenge for the engine manufacturers to build engines that can cope with a wide range of fuels, but still offer low exhaust emissions with no detriment to performance. In this work a test bed with a compression ignition engine has been used to measure emissions when using a ternary fuel blend between diesel, biodiesel and ethanol together with exhuast gas recirculation (EGR) and different fuel delivery techniques. EGR with biofuels have the potential to significantly reduce NOx over conventional diesel combustion. The fuel used, B2E9 achieves a 10% renewable content as set out in the UK government’s Renewable Energy Directive. Most studies reported in the literature evaluates emissions reduction technologies by only changing one factor-at-a-time at steady state conditions. This paper addresses these issues and presents a methodology utilising a Central Composite Design (CCD) analysis to optimise four engine parameters which include EGR percentage, main injection SOI, pilot injection SOI and pilot injection open duration over a transient drive cycle (WLTP) which makes the results more applicable to real world driving conditions. The optimisation of the CCD showed that NOx emissions decreases by 25% when the maximum exhaust gas recirculation is set to 45%, the main injection is retarded by 2 CADs, the pilot injection dwell time is set to 21 CADs and 24% of the fuel is delivered through the pilot injection. CO emissions increase by approximately 47% as a result of the decrease in NOx emissions.

Citation

van Niekerk, A., Drew, B., Larsen, N., & Kay, P. (in press). Impact of low NOx strategies on holistic emission reduction from a CI engine over transient conditions. International Journal of Engine Research, https://doi.org/10.1177/1468087420973887

Journal Article Type Article
Acceptance Date Oct 1, 2020
Online Publication Date Nov 24, 2020
Deposit Date Nov 30, 2020
Publicly Available Date Dec 3, 2020
Journal International Journal of Engine Research
Print ISSN 1468-0874
Electronic ISSN 2041-3149
Publisher SAGE Publications
Peer Reviewed Peer Reviewed
DOI https://doi.org/10.1177/1468087420973887
Keywords Mechanical Engineering; Ocean Engineering; Automotive Engineering; Aerospace Engineering
Public URL https://uwe-repository.worktribe.com/output/6906297

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