This document is a student project report on exhaust gas recirculation in two-wheeler engines. It summarizes that exhaust gas recirculation works by recirculating a portion of an engine's exhaust gas back into the cylinders to reduce nitric oxide emissions. It does this by lowering the peak combustion temperature since nitric oxide formation increases at high temperatures. The report concludes that exhaust gas recirculation is an effective and reliable method for reducing air pollution from vehicles and improving human health.

1. SIDDARTHA INSTITUTE OF SCIENCE AND TECHNOLOGY
(An ISO 9001:2008 Certified Institution)
(Approved by AICTE ,New Delhi & Affiliated to JNTUA,Ananthapuram)
Siddartha Nagar,Narayanavanam Road,PUTTUR-517583.
2013-2017
DEPARTMENT OF MECHANICAL ENGINEERING
B.Tech (2013-2017)

2. EXHAUST GAS RE-CIRCULATION IN S.I
ENGINES-TWO WHEELERS
BY
M.Lakshmipathi
(134E1A0327)
M.Bheemalinga chowdary
(134E1A0309)
P.Jayachandra Reddy
(134E1A0319)
B.Konda Reddy
(134E1A0323)
UNDER THE GUIDANCE OF
Mr. S. Bala Anki Reddy M.Tech
Assistant Professor in Mechanical Engineering

3. ABSTRACT
• Every Human Welfare organisation in the world are looking
forward for some method to control pollution .
• When we discuss air pollution,the major contribution of
pollutants are from the automobile.
• Among the pollution control system available ,we found that a
system based on exhaust gas recirculation(EGR).
• We hope that prescribed system might be implemented in
motorcycles to be launched in future.

4. INTRODUCTION
• Major problem faced by today’s world is environmental pollution.
• For which, vehicular traffic is a major contributor.
• Exhaust gases from vehicles includes CO, CO2 ,HC ,Nox etc.
• Exhaust gas recirculation is a Nox (nitrogen oxide and nitrogen dioxide)
reduction technique used in S.I.engines
• Since the use of S.I.engines (i.e.two wheelers) is rapidly increasing in
this era,the implementation of this technique in two wheelers could be
a possible solution to reduce pollution.

5. PRINCIPLE OF EGR
• EGR works by recirculating a portion of an engine’s exhaust
gas back to the engine cylinders.
• The exhaust gas also increases the specific heat capacity of
the mix lowering the peak combustion temperature.
• Because Nox formation progresses much faster at high
temperatures, EGR serves to limit the generation of Nox.
• Nox is primarily formed when a mix of nitrogen and oxygen is
subjected to high temperatures.

7. S.No Exhaust Constituent Disease Caused
1 Hydrocarbons(HC) Lung diseases
2 Lead(Pb) Blood Cancer
3 Carbon Monoxide(CO) Heart-Blood Circulation Problem
4 Nitrogen Oxides(NO) Asthma
5 Particulate matter (Suspended) Bronchitis/Asthma
MAIN DISEASES CAUSES IN HUMAN HEALTH

8. CONCLUSION
• Using Exhaust Gas Recirculation Technique in engines, the
emissions are very much controlled due to lesser amounts of NOx
entering the atmosphere.
• Exhaust Gas Recirculation is a very simple method. It has proven to
be very useful and it is being modified further to attain better
standards.
• This method is very reliable in terms of fuel consumption
• EGR is the most effective method for reducing the nitrous oxide
emissions from the engine exhaust.

9. THANK YOU