EMISSION CONTROL SYSTEM(except Korea)


  1. FUNCTION OF MAIN COMPONENTS


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

      Component Function
      Charcoal Canister Assembly Contains activated charcoal to adsorb the fuel vapor that is created in the fuel tank assembly.
      Purge VSV (No. 1 Vacuum Switching Valve Assembly) Opens in accordance with the signals from the ECM when the system is purging in order to send the fuel vapor that was adsorbed by the charcoal canister assembly into the intake manifold.
      ECM Controls the purge VSV (No. 1 vacuum switching valve assembly) in accordance with the signals from various sensors in order to achieve a purge volume that suits the driving conditions.

  2. SYSTEM CONTROL


    1. Purge Flow Control


      1. When the engine has reached a predetermined state [closed loop, engine coolant temperature above 75°C (167°F), etc.], stored fuel vapor is purged from the charcoal canister assembly whenever the purge VSV (No. 1 vacuum switching valve assembly) is opened by the ECM.

      2. The ECM will change the duty ratio cycle of the purge VSV (No. 1 vacuum switching valve assembly), controlling purge flow volume. Purge flow volume is determined by the intake manifold pressure and the duty ratio cycle of the purge VSV (No. 1 vacuum switching valve assembly). Atmospheric pressure is allowed into the canister to ensure that purge flow is constantly maintained whenever purge vacuum is applied to the charcoal canister assembly.

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