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.
Exhaust gas turbo-charging:
The performance of the combustion engine can be enhanced by means of turbo-charging. A turbo‐
charger compresses the air to allow more oxygen to flow into the combustion chamber. As a result,
more fuel can be combusted and the engine performance increases accordingly. The turbocharger
is driven by exhaust gas which makes turbo-charged engines very efficiently.
4.7.2 Exhaust gas treatment system
The exhaust gas treatment system primarily contributes to limiting the exhaust gas emissions of
the machine.
Fig. 13 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
Exhaust gas treatment system
9
Diesel oxidation catalytic converter (DOC)
10
Diesel particulate filter (DPF)
11
Sensors
12
SIGMA CONTROL SMART controller
Diesel oxidation catalytic converter (DOC):
The diesel oxidation catalytic converter uses the fuel which has not been burnt during final injection
for the active regeneration of the diesel particulate filter. The diesel oxidation catalytic converter
serves a source of heat for the regeneration of the diesel particulate filter.
4
Design and Function
4.7
Exhaust gas after-treatment
44
Operator Manual Portable Rotary Screw Compressor
MOBILAIR M58utility SIGMA CONTROL SMART
No.: 901779 08 USE
