The chosen model approach contains modeling of {TAIL ~ an external exhaust gas recycling system}, variable inlet systems and {HEAD ~ systems} with variable control valves 
The chosen model approach contains modeling of { TAIL ~ an external exhaust gas recycling system } , variable inlet systems and { HEAD ~ systems } with variable control valves
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH