СИСТЕМА СНИЖЕНИЯ ТОКСИЧНОСТИ ОТРАБОТАВШИХ ГАЗОВ


  1. 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 CO2for purification.