СИСТЕМА СНИЖЕНИЯ ТОКСИЧНОСТИ ОТРАБОТАВШИХ ГАЗОВ


  1. FUNCTION OF MAIN COMPONENTS


    1. The main components of the catalyst regeneration control are as follows:

      Components Quantity Function
      ECM 1 Based on the signals received from the sensors, the ECM determines the injection volume, injection timing and diesel throttle valve opening angle.
      Differential Pressure Sensor Assembly 1 Monitors the differential pressure before and after the DPF catalyst to detect whether the DPF catalyst is clogged.
      Exhaust Gas Temperature Sensor 2 Detects the temperature of the exhaust gas.
      Air Fuel Ratio Sensor 2 Detects the oxygen concentration in the exhaust gas. For details, see the 1WW Engine Control section.
      Injector Assembly 4 Injects the fuel to the cylinder. For details, see the 1WW Fuel section.

      Diesel Throttle Body Assembly


      • Diesel Throttle Valve

      • Throttle Control Motor

      		 1 Actuated by the ECM, the diesel throttle valve controls the flow rate of intake air. For details, see the 1WW Engine Control section and 1WW Intake / Exhaust section.

  2. SYSTEM CONTROL


    1. The ECM judges the NSR catalyst condition based on the fuel injection volume, intake air mass, and exhaust gas temperature to control the injector assemblies for NSR catalyst regeneration control.

    2. The ECM judges the DPF catalyst condition based on signals from the exhaust gas temperature sensor, differential pressure sensor assembly and air fuel ratio sensor to control the throttle control motor and injector assemblies for DPF catalyst regeneration control.

  3. FUNCTION


    1. NSR catalyst regeneration control optimally regulates the fuel injection volume and fuel injection timing in order to reduce the NOx stored in the NSR catalyst.

    2. DPF catalyst regeneration control optimally regulates the fuel injection volume, fuel injection timing and opening of the diesel throttle valve in order to burn Particulate Matter (PM) captured in the DPF catalyst.

    3. The ECM calculates the amount of NOx in the NSR catalyst based on fuel injection volume, intake air mass and exhaust gas temperature, and operates the injectors for NOx reduction control.

    4. As a result of the operation of these injectors, the air fuel ratio in the exhaust gas becomes rich to purify the NOx.

    5. The ECM judges the DPF catalyst condition based on signals from various sensors. When the ECM determines that PM has accumulated in the DPF catalyst, the ECM activates regeneration control.

    6. To reduce PM, the ECM controls the injection timing and the injection frequency of the injectors. In addition, the ECM controls the opening of the diesel throttle valve to maintain the exhaust gas temperature required to burn PM.

    7. At the same time, the filter substrate temperature becomes high and PM reacts with active oxygen and changes into CO2 for purification.