What are the Disadvantages of EGR?

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Disadvantages of EGR:

Since EGR reduces the available oxygen within the cylinder, the assembly of particulates (fuel which has only partially combusted) is increased when EGR is applied. This has traditionally been an issue with diesel engines, where the trade-off between NOx and particulates could be a familiar one to calibrators.

The deliberate reduction of the oxygen available within the cylinder will reduce the height of power available from the engine. For this reason, the EGR is sometimes shut off when full power is demanded, therefore the EGR approach to controlling NOx fails during this situation.

The EGR valve cannot respond instantly to changes in demand, and therefore the exhaust gas takes time to flow around the EGR circuit. This makes the calibration of transient EGR behavior particularly complex- traditionally the EGR valve has been closed during transients then re-opened once a gentle state is achieved. However, the spike in NOx / particulate related to poor EGR control makes transient EGR behavior of interest.

 

Difficulties of EGR:

The recirculated gas is often introduced into the intake system before the intakes divide in a very multi-cylinder engine. Despite this, perfect mixing of the gas is impossible to attain in any respect engine speeds/loads and particularly during transient operation. As an example, poor EGR distribution cylinder-to-cylinder may end in one cylinder receiving an excessive amount of EGR, causing high particulate emissions, while another cylinder receives deficient, leading to high NOx emissions from that cylinder.

Although the term EGR usually refers to deliberate, external EGR, there’s also A level of internal EGR. this happens because the residual combustion gas remaining within the cylinder at the tip of the exhaust stroke is mixed with the incoming charge. There’s therefore a proportion of internal EGR which must be taken under consideration when planning EGR strategies. The scavenging efficiency will vary with engine load, and in an engine fitted with variable valve timing, an extra parameter must be considered.

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