EMISSION CONTROL SYSTEM


  1. OUTLINE


    1. Exhaust Emission Control System


      1. Three-Way Catalytic converters (TWCs) are used in order to reduce exhaust emissions.

      2. The ECM controls fuel injection volume based on the signals from the air fuel ratio sensor and oxygen sensor, optimizing the exhaust emissions.

    2. Evaporative Emission Control System


      1. Except Models for Korea


        • The evaporative emission control system prevents the fuel vapor that is created in the fuel tank assembly from being released directly into the atmosphere.

        • The canister stores the fuel vapor that has been created in the fuel tank assembly.

        • This system consists of a purge VSV, canister and ECM.

        • The ECM controls the purge VSV in accordance with the driving conditions in order to direct the fuel vapor into the engine, where it is burned.

      2. Models for Korea


        • The evaporative emission control system prevents the fuel vapor that is created in the fuel tank assembly from being released directly into the atmosphere. This system has the following controls:


          • Purge flow control

          • Onboard Refueling Vapor Recovery (ORVR)

          • Evaporative emission (EVAP) leak check

        • The charcoal canister assembly stores the fuel vapor that has been created in the fuel tank assembly.

        • This system consists of a purge VSV, charcoal canister assembly, leak detection pump sub-assembly and ECM.

        • The ECM controls the purge VSV in accordance with the driving conditions in order to direct the fuel vapor into the engine, where it is burned.

        • In this system, the ECM checks for evaporative emission leaks and stores Diagnostic Trouble Codes (DTCs) in the event of a malfunction. An evaporative emission leak check consists of an application of vacuum to the evaporative emission system and the ECM monitoring the system for changes in pressure in order to detect a leak.

        • A canister pressure sensor is included in the leak detection pump sub-assembly.

        • A No. 1 charcoal canister filter is provided on the fresh air line. This No. 1 charcoal canister filter is maintenance-free.

    3. Exhaust Gas Recirculation (EGR) System (Models with EGR System)


      1. EGR control, together with the high efficiency EGR cooler, offers high fuel efficiency and power output. In addition, the vacuum sensor assembly detects the intake manifold pressure. This information is used to adjust the EGR volume to its optimum level.