A Review of Particulate Number (PN) Emissions from Gasoline Direct Injection (GDI) Engines and Their Control Techniques

Mohsin Raza, Longfei Chen, Felix Leach and Shiting Ding
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Mohsin Raza: School of Energy and Power Engineering, Energy and Environment International Center, Beihang University, Beijing 100191, China
Longfei Chen: School of Energy and Power Engineering, Energy and Environment International Center, Beihang University, Beijing 100191, China
Felix Leach: Department of Engineering Science, University of Oxford, Oxford OX1 3PJ, UK
Shiting Ding: School of Energy and Power Engineering, Energy and Environment International Center, Beihang University, Beijing 100191, China

Energies, 2018, vol. 11, issue 6, 1-26

Abstract: Particulate Matter (PM) emissions from gasoline direct injection (GDI) engines, particularly Particle Number (PN) emissions, have been studied intensively in both academia and industry because of the adverse effects of ultrafine PM emissions on human health and other environmental concerns. GDI engines are known to emit a higher number of PN emissions (on an engine-out basis) than Port Fuel Injection (PFI) engines, due to the reduced mixture homogeneity in GDI engines. Euro 6 emission standards have been introduced in Europe (and similarly in China) to limit PN emissions from GDI engines. This article summarises the current state of research in GDI PN emissions (engine-out) including a discussion of PN formation, and the characteristics of PN emissions from GDI engines. The effect of key GDI engine operating parameters is analysed, including air-fuel ratio, ignition and injection timing, injection pressure, and EGR; in addition the effect of fuel composition on particulate emissions is explored, including the effect of oxygenate components such as ethanol.

Keywords: PM emissions; GDI engines; particulate; particle number; fuel effects; biofuels; oxygenates (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (14)

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