EMISSION CONTROL SYSTEM


  1. SYSTEM CONTROL


    1. In order to regenerate the DPF, the temperature of the DPF is increased to combust the accumulated PM in the DPF, expelling it as CO2 and H2O.

    2. The ECM monitors the engine condition and calculates the total amount of accumulated PM. In addition, the ECM calculates the amount of combusted PM according to the engine speed, fuel injection volume and the injection volume of the exhaust fuel addition injector assembly. The amount of accumulated PM in the DPF is calculated based on the calculated total amount of accumulated PM and the amount of combusted PM. The ECM urges the driver to perform PM automatic or manual regeneration according to the level of accumulated PM.

    3. When automatic or manual regeneration is performed, the injection of the exhaust fuel addition injector assembly and the engine combustion condition are controlled, increasing the temperature of the DPF. As a result, the temperature of the DPF becomes approximately 600°C to 700°C and PM is combusted.

    4. When the vehicle is continuously driven with a high exhaust temperature such as at high speeds, the temperature of the DPF is sufficiently increased and PM is spontaneously combusted. At this time, no special control such as exhaust fuel addition injector assembly control, etc. is performed.

    5. When the vehicle is continuously driven while the temperature of the DPF is not high enough for PM combustion such as when driving for a short distance or driving for a short time, catalyst performance is decreased. As a result, PM is accumulated in the DPF. When the amount of accumulated PM exceeds the threshold (for automatic regeneration), the ECM performs automatic regeneration until the amount of PM reaches zero.

    6. If the vehicle continues to be driven for a short distance even after automatic regeneration is performed, more PM is accumulated. When the amount of accumulated PM exceeds the threshold (for manual regeneration), a message is displayed on the multi-information display*1 or the DPF warning light*2 illuminates or blinks to urge the driver to perform manual regeneration.


      • *1: Models with multi-information display

      • *2: Models without multi-information display

    7. Automatic Regeneration


      1. When automatic regeneration is being performed, the ECM controls the fuel injection of the exhaust fuel addition injector assembly and the engine combustion condition, increasing the temperature of the DPF to combust the PM. Idle up is performed while the vehicle is stopped.

        Tech Tips

        The end of automatic regeneration is calculated by the ECM according to the amount of accumulated PM.

    8. Manual Regeneration


      1. The following methods are used to perform manual regeneration. For details of manual regeneration operation, refer to the Repair Manual.


        1. Driving Method*1


          • Drive for 20 to 30 minutes at 65 km/h or higher to perform manual regeneration.

        2. DPF Switch Operation Method*2


          • Stop the vehicle and press the DPF switch to perform manual regeneration.

            Tech Tips

            Operating the accelerator pedal (models with an automatic transmission) or operating the clutch pedal and accelerator pedal (models with a manual transmission) while regeneration is being performed temporarily stops regeneration.


            • *1: Models without DPF switch

            • *2: Models with DPF switch

        3. Global TechStream (GTS) Operation Method


          • Stop the vehicle and operate the Global TechStream (GTS) to perform manual regeneration.

      2. When manual regeneration is being performed, the ECM controls the fuel injection of the exhaust fuel addition injector assembly and the engine combustion condition and performs idle up, increasing the temperature of the DPF to combust the PM.

        Tech Tips

        The end of manual regeneration is calculated by the ECM according to the amount of accumulated PM.

    9. Fail-safe


      1. If manual regeneration is performed when the amount of accumulated PM is beyond the threshold, the DPF may get damaged. Therefore, when the amount of accumulated PM exceeds the threshold (for the fail-safe function), the injection volume is controlled to a minimum level to cancel regeneration control. As a result, manual regeneration cannot be performed properly. At the same time, the MIL illuminates and a message is displayed on the multi-information display*1 or the DPF warning light*2 blinks to notify the driver of a malfunction.

        Figure 1. Relationship between MIL, Message on Multi-information Display*1, DPF Warning Light*2 and Regeneration Control (Conceptual Diagram)

        B005L02E01
        Text in Illustration MIL DPF Warning Light*2 Massage on Multi-information Display*1
        A - - -
        B - - -
        C - Illuminate DPF FULL SEE OWNER'S MANUAL*3 / DPF FULL MANUAL REGENERATION REQUIRED SEE OWNER'S MANUAL *4
        D - Blink DPF FULL VISIT YOUR DEALER
        E Illuminate Blink DPF FULL VISIT YOUR DEALER

        • *1: Models with multi-information display

        • *2: Models without multi-information display

        • *3: Models without DPF switch

        • *4: Models with DPF switch

        B005L0DC01
        *A LHD Models *B RHD Models
        *C Models without Multi-information Display *D Models with Multi-information Display
        *E Models with DPF Switch - -
        *1 MIL *2 DPF Warning Light
        *3 Multi-information Display *4 DPF Switch