Exhaust Gas Temperature Sensor (EGTS) #1 / #2 is each installed on upstream of LNT and upstream of DPF. EGTS monitors the temperature of exhaust gas that flows to E-VGT and DPF. ECM uses exhaust gas to burn off the soot accumulated in DPF when DPF regeneration condition is met. The exhaust gas temperature is one of the essential factor on engine operation.

Exhaust gas temperature sensor #1 (T4) : The post 1 injection increases exhaust gas temperature directly. EGTS #1 monitors successful post 1 injection with EGTS #1 and prevent excessive temperture increase.

Exhaust gas temperature #2 (T5) : The post 2 injection supplies HC(un-burned fuel) to oxidation catalyst converter. The HC(un-burned fuel) that supplied to oxidation catalyst converter is chemically reacted and increases the temperature of DPF and burn off the soot. EGTS #2 monitors temperature of DPF to prevent damage of DPF.