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External Exhaust Gas Recirculation

  • P. Sahaya Surendira BabuEmail author
  • P. Kumar
Chapter
Part of the Energy, Environment, and Sustainability book series (ENENSU)

Abstract

In diesel engines, NOx (Oxides of Nitrogen) forms when the flame temperature in the combustion chamber exceeds 2000 K. Late injection of fuel into the combustion chamber decreases NOx at the cost of fuel efficiency by 10–15%. Recirculating a part of the exhaust gas into the combustion chamber is termed as exhaust gas recirculation (EGR) which helps in reducing NOx with a particulate trade off. Diesel oxidation catalyst and a particulate filter are, therefore, necessary to reduce the particulate. In this chapter, the complex interactions between the EGR, turbocharger, EGR cooler, air fuel ratio, combustion efficiency and pumping work are described. It is shown that EGR provides an effective means for reducing flame temperatures and NOx emissions, particularly under lower air fuel ratio conditions. Combustion deterioration is predominant at higher load, low speed and lower boost conditions due to a substantial reduction of air fuel ratio with EGR.

Abbreviations

EGR

Exhaust gas recirculation

EMF

Exhaust manifold

IMF

Intake manifold

HCCI

Homogeneously charged compression ignition engines

EMS

Engine management system

SULEV

Semi ultra-low emitting vehicle

EDC

Electronic diesel control

EMS

Electronic management system

ECU

Electronic control unit

Chemical Formulae

NOx

Oxides of nitrogen

NO

Nitric oxide

NO2

Nitrogen dioxide

O2

Oxygen

CO2

Carbon dioxide

CO

Carbon monoxide

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Copyright information

© Springer Nature Singapore Pte Ltd. 2020

Authors and Affiliations

  1. 1.Ashok Leyland LtdChennaiIndia
  2. 2.Volvo EicherIndoreIndia

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