EMISSION CONTROL SYSTEM


  1. FUNCTION OF MAIN COMPONENTS


    1. The main components of the emission control system are as follows:

      Component Function
      ECM Controls the emission control system based on signals from each sensor.
      Electric EGR Control Valve Assembly*1 Actuated by the ECM, this valve controls the flow rate of EGR gas.
      EGR Valve Position Sensor (Built into Electric EGR Control Valve Assembly)*1 Detects the EGR valve position.
      Diesel Throttle Valve Actuated by the ECM, this valve controls the flow rate of intake air.
      No. 1 EGR Cooler*2 Cools EGR gas.
      No. 2 EGR Valve Assembly*2 Switches the flow passage of EGR gas in 2 stages.
      Differential Pressure Sensor*3 Monitors the differential pressure before and after the DPF to detect whether the DPF is clogged.
      Exhaust Fuel Addition Injector Assembly*3 Injects fuel into the exhaust manifold according to signals from the ECM.
      Exhaust Gas Temperature Sensor*3 Detects the exhaust gas temperature.
      No. 2 Exhaust Gas Temperature Sensor*3
      No. 3 Exhaust Gas Temperature Sensor*3
      Air Fuel Ratio Sensor*3 Detects the oxygen concentration in exhaust gas.

      *1: Models with EGR system

      *2: Models with EGR cooler

      *3: Models with catalyst support control

  2. FUNCTION


    1. The main function of the emission control system is as follow:

      Function Outline
      EGR Control*1 This system is designed to help reduce and control NOx formation due to a reduction of peak temperature in the engine combustion chamber, which is accomplished by the introduction of an amount of inert gas into the intake manifold.
      Catalyst Support Control*2 Determines the DPF catalyst conditions based on various signals, controls the injector assembly and exhaust fuel addition injector assembly, and controls the DPF catalyst conditions.

      *1: Models with EGR system

      *2: Models with catalyst support control