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The goal of EGR is thus to reduce NO x production by reducing the combustion temperatures. In modern diesel engines, the EGR gas is usually cooled with a heat exchanger to allow the introduction of a greater mass of recirculated gas. However, uncooled EGR designs do exist; these are often referred to as hot-gas recirculation (HGR).
Exhaust gas recirculation (EGR), on diesel engines, can be used to achieve a richer fuel to air mixture and a lower peak combustion temperature. Both effects reduce NO x emissions, but can negatively impact efficiency and the production of soot particles.
Catalytic converter, which also catalyzes NO x conversion but does not use urea or ammonia; Diesel exhaust fluid (DEF) or AdBlue; Exhaust gas recirculation versus selective catalytic reduction; Environmental engineering; Selective non-catalytic reduction (SNCR) NOx adsorber (LNT) Vehicle emissions control
Cummins Inc. (NYSE: CMI) is testing the same technology that boosts fuel economy in passenger vehicles to see whether it can dramatically reduce smog-forming oxides of nitrogen (NOx) emissions ...
In 2007, Caterpillar developed the C13 and C15 Acert engines which used VVT technology to reduce NOx emissions, to avoid the use of EGR after 2002 EPA requirements. [16] [17] In 2010, Mitsubishi developed and started mass production of its 4N13 1.8 L DOHC I4, the world's first passenger car diesel engine that features a variable valve timing ...
A NO x adsorber is designed to reduce oxides of nitrogen emitted in the exhaust gas of a lean burn internal combustion engine. Lean burn engines, particularly diesels , present a special challenge to emission control system designers because of the relatively high levels of O 2 (atmospheric oxygen ) in the exhaust gas.
The main drawback of lean-burning is that a complex catalytic converter system is required to reduce NOx emissions. Lean-burn engines do not work well with modern 3-way catalytic converter —which require a pollutant balance at the exhaust port so they can carry out oxidation and reduction reactions—so most modern engines tend to cruise and ...
To aid in economy, emissions, and reduce NVH, it has a high-pressure common-rail fuel injection system and piezo injectors that can spray up to five different injections per compression event. It has a water-cooled EGR system to reduce the temperature of the exhaust gas before being recirculated through the intake.