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How exhaust gas recirculation system works - Must watch
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- čas přidán 10. 12. 2014
- Hi this video explains about the Exhaust gas recirculation system, watch the entire video and lean it
This is a technology employed on engines to reduce the amount of harmful nitrogen oxides been pumped out from the exhaust of an engine. As the pollution norms are strict in many parts of the world such new initiatives will be seen in future also to protect our environment.
Exhaust gas recirculation system is a nitrogen oxide reduction technique used in petrol and Diesel engines. This works by recirculation a portion of the engine exhaust gas back to the engine cylinder.
Before going into exhaust gas re-circulation system let's learn about some basics of these oxides and how they are formed.
O2 or oxygen - two oxygen atoms are required to create oxygen.
N2 or nitrogen - two nitrogen atoms are required to create nitrogen.
NO or oxide of nitrogen - one nitrogen atom and one oxygen atom is required to create oxide of nitrogen.
NO2 or nitrous oxide - one nitrogen atom and two oxygen atoms are required to create nitrous oxide.
NOx or oxides of nitrogen - one nitrogen atom and three or more oxygen atoms are required to make oxides of nitrogen. ( “x” stands for unknown number of oxygen atoms )
CO or carbon monoxide - one carbon atom and one oxygen atom creates carbon monoxide.
CO2 or carbon dioxide - one carbon atom and two oxygen atoms.
EGR works by diluting the nitrogen with the inert gas carbon dioxide, to act as an absorbent of combustion heat to reduce high cylinder temperature. At a very high temperature only NOx is produced. So what EGR does is - it reduces the temperature by reducing the chance of NOx been created (but this heat reduction will definitely affect the engine efficiency) almost all the new generation engines used EGR to meet the emission standards.
EGR valve opens up when it get a back pressures from the engine exhaust and channels it back to the combustion chamber.The exhaust gas is channeled back to the engine cylinder because it's is much hotter than intake air.
As mentioned above NOx is created at very higher temperature, as the exhaust gas get mixes up with the intake air, as the percentage of oxygen in the mixture reduces. This will reduce the combustion ability and results the fuel to burn at lower temperature.
In some EGR system it will employ a cooler before the exhaust getting mixed with the inlet gas. So the fuel mixed with exhaust burns cooler and the chances of NOx production reduce.
Other than NOx reduction EGR is also used to:
1. To impart the knock resistance and reduce the need of high load fuel enrichment in SI engines.
2. Improving the ignition quality of difficult to ignite fuels in Diesel engines.
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everything's fine but why that fake accent??
Mallu
nice..it's very useful
Wow nice job.goodluck
Truly useful information for all of mech./automobile engineerin students,thanks alot for a brilliant faculty.
GOT CLEAR ABOUT egr SYSTEM, THANX A LOT
+Prabhu S
We are honored by that comment.
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TechTrixInfo.com
Super
Thanks for the comment
Great video..must watch before any examination.
GOOD ATTEMPT...EXPECTING MORE,.,.
Thanks a lot! very well explained!!
Thanks for the comment.
Very good explanation, thank you
Very Good explanation - Thanks. Takes me a few years (quite a few) back to chemistry class.
Very well explained.
Very well explained
thankyou for giving basic idea on Egr
Great explenation sir...
Very well explained.
Thank you.
Thanks for your team to share your knowldge....it will very usefull to all.
Thanks & very nice explained
Thanks. Understand better
Thanx for sharing ur knowledge
thanks alot
Thank you for your explanation and I got an information about EGR and could you please explain about valve variable timing
He seems pretty smart, but I have no clue what he's saying....
Great ..& Thank You..
hi, good to see your video.i am doing a project on this for two wheelers. so. can u tell me that what is the air-fuel ratio during cumbustion
nice explanation! thank you so much!
👍gud work bro
thanks a lot
really nice !!!
I am confused! How the connections will be present, if both EGR and Turbo/Super charger is present? As both of them needs the exhaust air to workout?
I like Ur doubt
thanks, excelent.
Good explanation !!! need some more infromaton
thnx a lot
+sandeep tomar
Thanks for the comment
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The main point to highlight here is that the O2 (from air inlet) is replaced/diluted with CO2 (from exhaust gas). CO2 has a higher heat capacity than O2 which therefore reduces peak temperatures in the cylinder. Cooling the exhaust gas does help reduce the overall reduction in combustion temperature but the main principle is the introduction of CO2.
how to determine if EGR is choked/ not working / totally out of order. is there any method to repair it again for Tata Indigo eCS CR4 ?? please answer all points ,i am trying to copingup with all these problems nowadays besides a lot of labor charges by mechanics but can't concluding if the EGR is really out of order/ replacing a new one???
very nyc
can you make a video showing how PCV valve system work? As well as how Catalyatic Converter work?
Does the EGR cooler uses the engine coolant?
+7150285
We have a video on catalytic converter
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TechTrixInfo.com I added ur number, if we have anything question related to automotive, we can u thru whatsapp? I'm currently a student studying in automotive
Thanks bro,
Tnx 👌👌👌
thank you it's great
+Hagana
Thanks for the comment
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does the existing air fuel mixture in the combustion chamber gets contaminated by recirculating the exhaust gases?
How does the ECM measure the amount of NOX to know how to control EGR valve?
Sir jis car me turbo charger hoga to os may egr kaha mount hoga turbo charger say phely ya os kay baad or turbo charger jab boost pressure bnaeyga intake manifold may to egr valve ka diaphragm jo intake manifold may pipe say connect hoga wo kesy open hoga gas recirculate krny kay liey kion kay turbo charger ki badolat inlet manifold may positive pressure built up ho jaey ga jo suck krny ky bjaey push kryga to os surat may egr valve kesy kaam karyga.... Plz reply
How egr works at idle?is it open or closed...and when engine run to 2000 rpm.what happen to egr is it closed or open?
So will an egr off do any harm to the engine?
Very well explained. Thank you sir :)
+Urvaksh Bhathena
Thanks for the comment
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how can u say that ???
Sir looks like a Malayalam hero
Hi Sir, Its really help me to under stand the working principle of EGR system. But after watching this video, i have one question. It would be great if you could answer my question. My question is,
Once the EGR start working, the intake air will contains normal air (O2+N2) and NOx as cooled air. What will happen to this NOx after combustion? Because we do this to reduce the NOx emission but the intake air itself contain the NOx.
there will be a catalytic converter placed between the exhaust valve and muffler so that NOx is reduced to nitrogen and oxygen
In case of using EGR system, we are focusing on reducing NOx emissions. But what is the influence of this system on HC and CO emissions?? Brief them please...
+Ravi Ganesh
The impact is on Nox,
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Sir through egr ...Can NOX emssions could be completely stopped ?
at wat temp. dose EGR open
Does it make any damage to car if we remove egr frm engine??
How it will compensate engine output?
Very informative. I wonder how they figured out that this system would reduce NOx
+richard michaud pretty simple if you talk about figuring out this thing. Basically Nox gases occur at very high temperatures (approx 2500 degree C) i.e. combustion temp , this is the threshold temp for the prod of Nox gases , hence the idea of lowering down that peak temp is what form the only basis to reduce nox. there is no rocket science.
regards
+Sahib Singh
Well explained
Thanks for the comment
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thanks :)
good explanation, but where is the function of Turbo? Most of the Diesel engines has turbo chargers which is somehow connected with EGR system as well.
Can you tell me how the exhaust should look if I need the sound to be as low as possible? Engine is from lawnmower 3,5HP 4 stroke, gas powered.
Make sure you have a resonator and muffler to allow maximum quietness
So how does that exhaust ges get to my cylinder when my turbo is blowing 25psi into the intake manifold?
could you plz tell the difference between egr and eghr ?
What is the function of exhaust gas bypass ?
How to very percentage of ex. Gas for engine intake system.?
Why not also cool the air before it enters the combustion process in the intake manifold?
+Kyle K for air it has intercooler that receive air from compressor and ambient. The function of intercooler is to cool the air before go to intake manifold to reduce the hot spot in combustion chamber. so the EGR make additIonal cool the gas in intake valve that reduce the NOx
like it
Thankx a lot
+Ajay Azad
Thanks for the comment
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Where u now....
Egr is generally used in GDI engines (and air assisted fuel injection) rgt where we can attain high compressing ratio due to efficient cooling of cylinder by absorbing latent heat by fuel. (Where temp rise during combustion will be very high due to which large possibilty of NOx emissions as well as the stratified mixture create which will also accelerate NOx emissions)
So this exhaust gas will reduce the temperature during ignition time only rgt as engine is already at normal condition .so how come it helps in reducing knocking .
Or if it cool the engine further at initial condition there may be chances of over cooling of engine rgt so how will you account for tat .
Just a doubt may be foolishness.please clarify my doubt
I don't know how exhaust gas recirculation can lower cylinder temperature when you got hot gases entering the intake port.
cooled no2 and co2 won't cool the engine it just replaces some part of oxygen and nitrogen and dilute the fresh charge since oxygen is less fuel air mixture will ignite slowly hence reducing engine peak temperature their by reducing nitrous oxide emissions since oxygen and nitrogen combines at higher temperature and also exhaust gas does not support any combustion since exhaust gas is mixed with cold air intake that is fresh charge which will increases inlet temperature and hence density of fresh charge will drops hence performance is also drops so thats why we need to cool exhaust gas before diluting into fresh charge and cooled exhaust don't cool the engine as you mentioned in this video don't mislead the people.
Because more amount of work is done on compression of the charge which is already hot
"Nitrous oxates"🤣🤣🤣🤣 Do you even know chemistry?
sir crank sancer ko maltimeatr se kasa check karta hi
Sir...
Low Pressure EGR system kya hota he..??
normal EGR or low pressure EGR me kya difference he..??🤔🤔
I want temperature in coolant and out side temperature
SIR PLEASE UPLOAD A VIDEO OF THE JCB T3 SILENCER
Wait a minute what the hell is this? The dude instead of talking about the operation of the EGR valve; instead he talks about the chemistry of what goes on in the combustion.
1.30 If u re-circulate hotter exhaust gas back to the cylinder how will NOx reduce
3.23 - NOx doesnt mean more Oxygen Atoms and harmful. NOx means all Oxides of Nitrogen which includes NO, NO2, N2O, N2O5 etc.
ya... thnx a lot...
+Nishant Khalde
Thanks for the comment
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well egr valve recirculating hot nox,co2,no2 gases but we need to well understood about Hindi, so plz I req. for Hindi version to reload this
instead of EGR what if a little amount of exhaust gas remains in the combustion chamber. it would give the same effect as EGR. and it can happen if scavenging rate is reduced !!
+Nishant Khalde Your are forgetting that the main aim is to lower the combustion temperature , how can the unscavenged exhaust gases ( which are are at high temp) accomplish our purpose ? We need some kinda mechanism ( here, a coolant system , like a radiator) to lower down the temp of exhaust gases so that they can be used again. simple !
hope it helps.
regards
Then why we should not install an air cooler directly to the air intake ? Then no circulation process is required.
Looks like you chewing bubblegum and singing a Indian song but great video bro :)
how can i solve the problem
why can we just cool intake air in place of exhaust gas?
would greatly reduce engine efficiency
+purushottam kumar thermal efficiency of the engine would lower down fourfold. read IC engines and thermal efficiency for greater details.
+JAYANTH joseph
Yes good observation
Thanks for the comment
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mine doesn't work like that !!!!!!
sir 2 egr fillter name?
everything is good but word pronunciation feel hard to understand.
Sir ji hindi me b samjha do egr
EGR is a joke for the environment! Don't get me wrong, it does reduce nox once it leaves from the pipe, but like myself, I'm a truck driver, And in the real world, egr engines push more nox than a none Egr engine, egr engine will have to inject more fuel (due to lack oxygen)to get the same power than a none egr engine example : let have two trucks with Detroit engine 60 series, one has egr and the other does not, both trucks(bobtail, similar weight) travel 500 miles,
The none egr truck will do above 10 mpg(I experienced it myself)
While the egr truck will do 6.8mpg or less, so this truck wasted more fuel, and more fuel=more exhaust.
So the question is... did the truck with egr really reduce nox during the 500 miles?
PS: the none egr used 50 gallons desiel
And the egr truck 73.52 gallons, that's 23.52 more desiel than the none egr at 500 miles.
Fuel consumption has almost nothing to do with NOX. NOX is formed when oxygen and nitrogen are heated beyond a certain temperature. By reducing the peak combustion temperature inside the cylinder that temperature is either not reached or isn't reached for as long reducing the formation of NOX.
EGR diesels do consume more fuel, are less efficient, are less powerful and produce slightly more soot and carbon dioxide BUT they do emit less NOX.
You realise that when they test this stuff they do run the engines too right?
You're experience with MPG has pretty much zero relevance to NOX emissions. If the EGR diesel is doing that much worse I would suspect that there may be a problem. When I blanked the EGR on my diesel the fuel economy didn't improve by 32% more like 10%. How old are these trucks, is the egr Computer controlled or is it a dumb system?
Leviticus Rodriguez with respect....
by taking out catalytic conver we can save fuel too but think about environment ,u burn millions of gallons no one cares unless no harmful gases are in exhaust.
without EGR
more fuel =more exhaust with more harmful gases
with EGR
more fuel =more exhaust but with less harmful gases
give cleaner environment to your kids and all of us so we all can breathe .
Zia Din I'm sorry to desagree, no egr= better fuel saving
Egr=very bad fuel milage
I should know, my wife and I been on the road for so many years driving are own trucks
Leviticus Rodriguez You miss the point.
We agree that EGR does reduce your mileage! It absolutely increases your fuel consumption! We agree with that.
What EGR does and why it was mandated was too reduce NOX emissions to reduce acid rain and the like.
As Zia said if you remove the catalytic converter you also improve fuel economy, that doesn't mean that you should though as it means that the exhaust gases are more toxic. It isn't just about CO2 and fuel economy.
+Leviticus Rodriguez the more I think about the silliness of the EGR system the more I think it must have been desing by the oil industry !!!!!!!!
would have been better if he had spoken in his natural english accent...otherwise its tough to understand
He spoke in his natural English accent which happens to be Malyali accent. Most indians have their regional language accent when they speak English.
hello
NOx doesn't produce with the reaction of atmospheric nitrogen, it forms due to the presence of nitrogen in the fuel
NO means nitric oxide not nitrogen oxide at around 4 minutes
Why u cut the video after every sentence?
try to make video smooth. too much breaks.
I can't understand a word. I just see a guy moving his mouth and bunch of noise coming out.
seriously dude it was a total waste of 7.01 minutes..I was literally waiting for a perfect and to the point operation of EGR system which was missing. you just kept pondering upon one and the same thing, Instead of telling a story you should have only focus on its functionality...don't get me wrong but i'm trying to give you a followup which I guess will help you in future videos...thanks!
baakwaas
What's with his accent?
Please speak clearly
Don't be fake in ur ascent
é PhÚńĎíŤ THýŃé PhŮņđÎt MéŘâĆhŘěÂđ ĶhÂâB AřĆh-BhéĶřÉêĐ ThÔóMb ¿ ¿ ❌ ❌ ✔
abe hindi main samjha .
So u got the cat transforming the gases (exost fumes ) environmental friendly ..why in the f u have to run the fumes back in the chambers. That's wher u get : 1 carbon build up , ,2 low engine performance, 3 is reducing the life of ur oil extremely (the carbon gose thru piston rings in the oil-thats wher black gunky oil comes from) 4 distroing the life of un engine (bad friction due bad oil mixed with carbon) etc So at 150000 look for other car allready . Imagine a clean fuel +oxygen mix, no trash in it . If u worried about environment ,put another cat converter in ther . Feel sorry for truck drivers , this system messing up theyr work and capital .I'm talking thousands spent in repair on that kind of "technology". Needs un update .
Bhai Hindi style me English bol bahaut Ganda English bol rha hai copy Sahi SE nhi Kar paa rha tu