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Development of an Active Regeneration System
Based OnCatalytic Combustion
Active regeneration Based on secondary fuel injection and catalytic combustion
0
10
20
30
40
50
60
150 200 250 300 350 400 450
Inlet Temperature (°C)
Soot
Oxi
datio
n R
ate
(g/h
r)
4.8 g/L
2.4 g/L
0.6 g/L
Soot oxidation rate
0
50
100
150
200
250
300
350
400
600 620 640 660 680
DPF Inlet Temperature (°C)
So
ot
Ox
ida
tio
n R
ate
(g
/h
r)
NO2 Regeneration
2NO2+C => 2NO +CO2
O2 Regeneration
O2+C => CO2
Active regeneration Based on secondary fuel injection and catalytic combustion
Fuel consumption
0
100
200
300
400
500
0 25 50 75 100 125
Power output (kW)
Expe
cted
Tem
p In
crea
se
(°C)
150 kg/hr
700 kg/hr
1200 kg/hr
0
30
60
90
120
150
0 50 100 150 200 250
Fuel Injection Rate (cm3/min)Po
wer
out
put (
kW)
Active regeneration systemSystem description
- Based on secondary fuel injection
- Catalytic combustion
- Controlled Regeneration
- Ensures required Soot oxidation Rates.
Active regeneration systemMain components
- Fuel supply
- Injection manifold
- Electronic control unit
Control Algorithm
Regeneration start parameters
• Max soot loading is reached.
• And/or min. regeneration time interval reached.
• Acceptable exhaust temperature
Control Algorithm
Regeneration stop parameters
• Injection time has elapsed.
• Engine switched off.
• Temperature after catalyst under low limit over time.
• Temperature after catalyst over high limit.
• System error.
Active regeneration system Field trial
System descriptionInjection manifold / Dosing unit
Combustion catalyst
Fuel delivery system
DPF
Field trial resultsExample of regeneration event
Engine speed
Engine load
Fuel pressure
Air pressure
After catalyst
Before DPF
Exhaust pipe
Before catalyst
After DPF
Field trial resultsExample with regeneration triggered by exhaust back pressure
Exhaust back pressure
Temperatures
After catalystBefore catalyst
140 mbar
Field trial resultsDPF performance
• Low temperature application
• High PM application
• Controlled regeneration
• Succesful regeneration
• Clean tailpipe
Safety features
Control system safety functions• Injection, air pressure and fuel pressure stop at system error.
• System error at high catalyst outlet temp
• System error at hi/lo Fuel and air pressure.
• System error at Injection (PWM) feed back error.
• System error at EGR error (if used)
• Fuel pressure only in injection mode