chapter 13.7 exhaust gas re-circulation valve. egr cooler e – exhaust g – gas r –...
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CHAPTER 13.7Exhaust Gas Re-Circulation Valve
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EGR Cooler
• E – Exhaust • G – Gas• R – Recirculation
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The ABC’s OfExhaust Gas Recirculation (EGR)
OVERVIEW
In general, the higher the engine temperature, the more efficient the engine.
Which results in:
1) Good Performance
2) Good Fuel Economy
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The ABC’s OfExhaust Gas Recirculation (EGR)
When peak temperatures are high enough for long
enough periods of time, the nitrogen and oxygen in the
air combine to form new compounds, primarily NO and
NO2. These are normally referred to collectively as
“NOx – Nitrogen Oxide”
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The ABC’s OfExhaust Gas Recirculation (EGR)
• Too much NOx in the atmosphere contributes
to the production of smog.• In October of 2002, new NOx standards required the
diesel engine industry to introduce additional
technology to meet the new standards.• EGR COOLER
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The ABC’s OfExhaust Gas Recirculation (EGR)
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How Can NOx Be Reduced?
• Since high cylinder temperatures cause
NOx, NOx can be reduced by lowering
cylinder temperatures. Charge air coolers
are already commonly used for this
reason.
• Reducing the amount of oxygen in the
cylinder, inhibits the combustion process
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How Can NOx Be Reduced?
• The best way to reduce NOx is to limit the
amount of oxygen in the cylinder. Which
results in lower cylinder temperatures.
• This is done by recirculation of exhaust
gas (EGR) into the cylinder.
• This technique lowers cylinder
temperature, reducing NOx, But it also
reduces fuel economy and performance,
and creates excess soot.
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The ABC’s OfExhaust Gas Recirculation (EGR)
• When EGR is required, the engine’s electronic controls open the EGR valve.
• Turbocharger & EGR Valve (1)
1
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Exhaust Gas Recirculation (EGR)
• The exhaust gases flow through this pipe to the EGR cooler. (2)
2
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The ABC’s OfExhaust Gas Recirculation (EGR)
• The exhaust gases are cooled by water from the engine cooling system. (3)
3
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The ABC’s OfExhaust Gas Recirculation (EGR)
• The cooled exhaust gases
then flow through the EGR
transfer pipe into the
intake manifold. (4)
• Which then lowers the
cylinder temperature
• Results in lower NOx
production.
4
4
Intake Manifold
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Regeneration SystemWhat is its job ?
• The system's job is to capture and burn off
(regenerate) the particulate matter (soot) in the
engine exhaust gas .
• It does this using a Diesel Oxidation Catalyst (DOC)
and a Diesel Particulate Filter (DPF). By monitoring
exhaust gas temperature and system back pressure,
Detroit Diesel Electronic Control determines when
and how additional help is needed to ensure
complete regeneration of the soot captured in the
DPF.
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Types of Regeneration
• There are two types of Regeneration ?
1. Active
2. Stationary.
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Types of Regeneration
1. Active Regeneration • During normal driving the Intake Throttle is
electronically actuated to help increase the
After treatment System temperature while the
unit is running.
• The Dosing Valve injects a mist of diesel fuel
into the exhaust system to further increase the
After treatment System temperature until
satisfactory regeneration is complete.
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Types of Regeneration
2. Stationary Regeneration
• Depending on engine duty or application, the
Detroit Diesel Electronic Control (DDEC) may
notify the driver that stationary regeneration is
necessary.
• After the driver begins the manual activation of
the regeneration process, the RPM’s go up to
1650 (High Idle is 1400 RPM’s)
• Regeneration take about 20-30 minutes.
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Stationary Regeneration Manual Activation
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Manual Regeneration Switches
Regen Request
Regen Inhibit
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Regeneration Manual Switch Position
Regen Switch UP
Hold Regen Request Switch up for 5 – 10 sec.
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Regeneration Location
Regeneration Valve
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Regeneration Trouble Shooting
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References
• Detroit Diesel Engine Manual
• www.detroitdiesel.com
• Firefighter Chris Adams
Station 13C