Exhaust Gas Recirculation

What is the function of EGR?

The Exhaust Gas Recirculation (EGR) system works by diverting part of the exhaust gases to the intake manifold, lowering combustion temperatures and therefore reducing the amount of NOx emitted. The EGR valve is the main component of the EGR system and it’s normally closed.

Does EGR affect performance?

It can be observed that 15% EGR rate is found to be effective to reduce NOx emission substantially without deteriorating engine performance in terms of thermal efficiency, BSFC, and emissions. At lower loads, EGR reduces NOx without deteriorating performance and emissions.

What are disadvantages of EGR?

Exhaust gas recirculation (EGR) is an effective strategy to control NOx emissions from diesel engines. NOx emissions may be further reduced by cooling the EGR stream. Drawbacks of EGR include increased particulate matter emissions and increased fuel consumption.

Can you drive with EGR valve disconnected?

You should not drive your car with a disconnected EGR vacuum hose because the engine control unit will reduce power. This is done to motivate diesel operators to keep the Advanced Emissions Systems in working order.

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