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Mack, EPA2010 Emissions Solution 245
Exhaust Aftertreatment System Components
and
Selective Catalytic Reduction (SCR)
Selective Catalytic Reduction (SCR) is an
emissions-reduction technology with the
ability to deliver near-zero emissions of
nitrogen oxides (NOx), a smog-causing
pollutant and greenhouse gas. SCR’s
performance has been proved in millions
of miles of real-world trucks in other
countries, as well as in long-term field
tests in the U.S.
SCR reduces NOx emissions to very low
levels, while at the same time delivering
excellent fuel economy and reliability.
The system doesn’t change the design
or of the basic engine. Rather, SCR is
an aftertreatment system which converts
NOx in the exhaust stream into harmless
gases. Modern diesels already use exhaust
aftertreatment systems, called diesel
particulate filters, to control emissions of
another pollutant, soot (also known as
particulate matter or PM).
SCR works by injecting Diesel Exhaust
Fluid (DEF) into the exhaust. DEF is a
solution of ultra-pure water and urea. DEF
works with the heat of the exhaust and a
catalyst to convert NOx into nitrogen and
water vapor - two harmless and natural
components of the air we breathe. The
end result is cleaner air, excellent fuel
efficiency and a reliable emissions control
system for today’s modern diesel engine.
W2031651
System Operation
1 Diesel engine optimized for high
performance, low particle emissions
and low fuel consumption.
2
Aftertreatment DEF tank
3
The Aftertreatment Control Module
(ACM) continuously monitors and
adjusts the DEF injection rate.
4
DEF is injected into the exhaust gases
in between the Aftertreatment DPF (5)
and the SCR catalyst (6).
5 Aftertreatment Diesel Particulate Filter
(DPF).
6
In the SCR catalyst, nitrogen oxides
are transformed into harmless nitrogen
gas and water.
7 The system notifies the driver when it
is time to refill tank with DEF.
Summary of Contents for Granite GU Series
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Page 44: ...SAFETY INFORMATION 33 Advisory Label Locations On Vehicle Labels Found on Chassis C0029831 ...
Page 45: ...34 SAFETY INFORMATION C0028958 ...
Page 46: ...SAFETY INFORMATION 35 C0028959 ...
Page 47: ...36 SAFETY INFORMATION C0029013 1 Right Side Frame Rail 2 Hood Prop ...
Page 48: ...SAFETY INFORMATION 37 C0029014 ...
Page 49: ...38 SAFETY INFORMATION Labels Found on Driver Side Sun Visor C0029832 ...
Page 50: ...SAFETY INFORMATION 39 C0029016 ...
Page 58: ...SAFETY INFORMATION 47 C0029833 ...
Page 60: ...SAFETY INFORMATION 49 C0029834 ...
Page 62: ...SAFETY INFORMATION 51 C0029835 ...
Page 72: ...INSTRUMENTS AND CONTROLS 61 Panel B W3056238 ...
Page 81: ...70 INSTRUMENTS AND CONTROLS C0029141 ...
Page 82: ...INSTRUMENTS AND CONTROLS 71 Diagnostics W3036575 W3036576 W3036583 ...
Page 84: ...INSTRUMENTS AND CONTROLS 73 C0029144 ...
Page 113: ...102 INSTRUMENTS AND CONTROLS C0029240 C0029241 ...
Page 235: ...224 OPERATION C0029351 ...
Page 241: ...230 OPERATION C0029352 ...
Page 284: ...MAINTENANCE AND LUBRICATION 273 C0029851 C0029852 1 Towhook Access ...
Page 305: ...294 MAINTENANCE AND LUBRICATION C0029434 1 Front 2 Back ...
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