СИСТЕМА СНИЖЕНИЯ ТОКСИЧНОСТИ ОТРАБОТАВШИХ ГАЗОВ


  1. FUNCTION OF MAIN COMPONETS


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

      Component Outline Quantity Function
      ECM 32-bit CPU 1 Effects overall control of the emission control system to suit the operating conditions of the engine in accordance with the signals provided by the sensors.
      EGR Valve DC Motor Type 1 Actuated by the ECM and controls the flow rate of EGR gas.
      EGR Cooler Water-cooled Type 1 Cools EGR gas.
      Exhaust Fuel Addition Injector Solenoid Type 1 Injects fuel into the exhaust port.
      Differential Pressure Sensor Semiconductor Strain Gauge Type 1 Monitors the differential pressure before and after the DPNR catalyst to detect whether the DPNR catalyst is clogged.
      Exhaust Gas Temperature Sensors Thermistor Type 2 Located before and after the DPNR catalyst and detect the temperature of the DPNR catalyst.
      Air Fuel Ratio Sensor Heated Type (Planar Type) 1 Detects the oxygen concentration in the exhaust gas.

  2. SYSTEM CONTROL


    1. The emission control system has the following systems:

      System Outline
      D-CAT System

      Based on the signals received from the sensors, the ECM controls the exhaust fuel addition injector to purify the NOx, HC, CO, and Particulate Matter (PM).
      Air Fuel Ratio Sensor Heater Control Maintains the temperature of the air fuel ratio sensor at an appropriate level to increase accuracy of detection of the oxygen concentration in exhaust gas.
      EGR Control Based on the signals received from the sensors, the ECM determines the EGR volume via the EGR valve and EGR cooler bypass valve in accordance with the engine condition.

  3. FUNCTION


    1. D-CAT System


      1. The ECM judges the exhaust manifold converter condition based on signals from the mass air flow meter, engine coolant temperature sensor, 2 exhaust gas temperature sensors, differential pressure sensor and air fuel ratio sensor to control the injectors and exhaust fuel addition injector for catalyst support control.

      2. The catalyst support control consists of a NOxreduction control, PM reduction control and sulfur poison recovery control.

    2. EGR Control


      1. This system is designed to help reduce and control NOxformation due to a reduction of peak temperature in the engine combustion chamber, which is accomplished by the introduction of amount of inert gas into the intake manifold.