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 Actuated by the ECM, this valve controls the flow rate of EGR gas.
      EGR Valve Position Sensor (Built into Electric EGR Control Valve Assembly) 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 Cools EGR gas.
      No. 2 EGR Valve Assembly Switches the flow passage of EGR gas in 2 stages.
      Differential Pressure Sensor Monitors the differential pressure before and after the DPF to detect whether the DPF is clogged.
      Exhaust Fuel Addition Injector Assembly Injects fuel into the exhaust manifold according to signals from the ECM.
      Exhaust Gas Temperature Sensor Detects the exhaust gas temperature.
      No. 2Exhaust Gas Temperature Sensor
      No. 3 Exhaust Gas Temperature Sensor
      Air Fuel Ratio Sensor Detects the oxygen concentration in exhaust gas.

  2. FUNCTION


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

      Function Outline
      EGR Control 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 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.