Exhaust Gas Recirculation System (EGRS) — carengineered.com

Introduction

Ever wonder, what if we could develop a system in which we could just utilize the exhaust gas in a way to assist the car to run. Exhaust Gas Recirculation System (EGRS), by its name is a circulatory system in an automobile that uses the exhaust gas for its power production and adding up some of the advantages to its usage to counter larger drawbacks of its nitrogen oxide emissions.

This system is employed in both the gasoline engines as well as the diesel engines, but majorly is constituted in a diesel engine because of the reason that as the major part of the diesel engine emission is the nitrogen at peak temperatures inside a combustion chamber.

In Exhaust Gas Recirculation System, 10–15% of the exhaust gas after the combustion with large amounts of nitrogen oxides and oxygen are reintroduced into the combustion chamber via the intake manifold.

The fact that the exhaust gas exiting from the exhaust port has high temperature, an intercooler(heat exchanger) is employed along the circulatory system to cool down the warm exhaust before entering the combustion chamber.

Types of Exhaust Gas Recirculation System

Exhaust Gas Recirculation system Internal — In this system the exhaust gas is sucked back into the combustion chamber at the time of valve overlap, intake valve during the suction stroke and the exhaust valve at the time of the exhaust stroke.

Exhaust Gas Recirculation System External — In this system the exhaust gas is recirculated back into the combustion chamber with prior introducing it into the intake manifold.

Components for EGR System

• EGR Valve
• EGR Cooler or Intercooler (Optional)
• EGR Cooler bypass (Optional)
• Intake Throttle Valve

Advantages of EGR

Reduced Nitrogen Oxide Emission

Reduction of Throttling losses in Gasoline engines at part loads.

Increase the life of the cylinder or particularly the exhaust Valve.

Disadvantages of EGR

As this system reduces the oxygen content in the cylinder, thus the amount of particulates increases.

The EGR valve does not immediately respond o the need of the situation, and thus to calibrate the system becomes more complex.

Originally published at https://www.carengineered.com on October 12, 2020.