Grasping Low Pressure EGR

[jeepoch]

Paul,

Unfortunately I can't answer your questions. I had left Chyrsler when they merged with Daimler quite a while ago. I floated my resume and landed in Broomfield CO with Sun Microsystems. I did indeed implement EGR software but not on the current 3.0L Diesel.

Sorry.
Jay

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[AC77]

EGR (Exhaust Gas Recirculation) in practice is primarily used to lower NOx (Nitrous Oxide) emissions. It does this by recirculating (reintroducing) some amount of exhaust gas back into the O2 stream of the piston's input cycle. Since the exhaust gas is now essentially inert (incombustible) it displaces a fraction of the volume of overall combustible oxygen entering the piston chamber. This then lowers the amount of heat at combustion, due to lesser amount of O2 that would otherwise typically be present. Nitrogen N and Oxygen O form NOx only at very high peak temperatures. Thus, the small amount of exhaust recirculated back into the air input lowers the combustion temperature which reduces (but not totally eliminates) NOx production.

And yes, I used to be a Chrysler Powertrain Software Engineer that helped developed the Engine Controller code to manage the EGR Valve.

Jay

Just a side note- NOx is nitric Oxide not to be confused with NOS = which is nitrogen Oxide in a bottle - ?