Improving Exhaust Temperature Management At Low-loaded Diesel Engine Operations Via Internal Exhaust Gas Recirculation

Year 2019, Volume: 21 Issue: 61, 125 - 135, 15.01.2019

Hasan Üstün Başaran

Abstract

Modern on-road automotive vehicles
mostly utilize exhaust after-treatment (EAT) systems to meet the stringent
emission regulations. Although those systems are generally effective to reduce
emission rates, they are ineffectual at low loads due to low exhaust
temperatures (below 250^oC). This study demonstrates on a diesel
engine model that exhaust temperatures can be increased above 250^oC
at light loads through internal exhaust gas recirculation (IEGR). Engine system
operates at 1700 RPM engine speed and within 2.5-4.5 bar brake mean effective
pressure (BMEP) engine load. IEGR increases the amount of in-cylinder hot
residual exhaust gases and thus causes a considerable exhaust temperature rise
(up to 70^oC). Warmer exhaust system keeps EAT emission conversion
efficiency mostly above 90 % and accelerates EAT catalyst bed warm-up through
increased (up to 142 %) heat transfer rates. IEGR is not as fuel-consuming as conventional
EAT warming techniques and can keep the fuel consumption rise below 5 %.

Keywords

Diesel engines, Exhaust Gas Temperature, Exhaust After-treatment Management, Internal Exhaust Gas Recirculation

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