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Fig. 10 Principle of treatment devices
1
Engine control unit (ECU)
a
Common rail system
2
Engine block
3
Exhaust gas return valve (EGR)
4
Inlet throttle
5
Intercooler
6
Cooler exhaust gas return (EGR)
7
Air flow meter
8
Turbocharger
b
System exhaust gas treatment
9
Diesel oxidation catalytic converter (DOC)
10
Sensors
Exhaust gas recirculation (EGR)
At high combustion temperatures, increasingly damaging nitrogen oxides (NOx) develop in the en‐
gine. To reduce these levels, the combustion temperature must be lowered. The exhaust gas recir‐
culation circulates a portion of the exhaust gas back to the inlet side of the engine where it is added
to the inlet air. This reduces the available oxygen volume and thus the combustion temperature.
Both measures reduce the development of nitrogen oxides.
Exhaust gas recirculation occurs only in the partial load area of the engine because the engine
runs particularly lean in this area. Exhaust gas recirculation is not practical in cold start, warm-up
and full load.
Diesel oxidation catalytic converter (DOC)
The diesel oxidation catalytic converter has a catalytic surface converting the pollutants in the ex‐
haust gas into harmless substances. Carbon monoxides and non-burned hydrocarbons are forced
to react with oxygen and converted to carbon dioxide and water. In addition, the nitrogen monox‐
ides are converted to nitrogen oxides. To achieve a high efficiency, temperatures must be higher
than 482 °F.
4.8 Options
The options available for your machine are described below.
4
Design and Function
4.8
Options
No.: 901765 05 USE
Operator Manual Screw Compressor
M114 SIGMA CONTROL SMART
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