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