Document ID: chunk:federal_register_of_legislation:F2023L00129:reg:10:p121
Version: federal_register_of_legislation:F2023L00129
Segment Type: reg
Provision Reference: reg 10 (pt 121/150)
Character Range: 1060165–1063303

counter after a period when its value has been frozen
A.2.5.  Illustration of the activation and deactivation and counter mechanisms
A.2.5.1. This paragraph illustrates the activation and deactivation and counter mechanisms for some typical cases. The figures and descriptions given in paragraphs A.2.4.2., A.2.4.3. and A.2.4.4. are provided solely for the purposes of illustration in this annex and should not be referenced as examples of either the requirements of this Regulation or as definitive statements of the processes involved. For simplification purposes, for example, the fact that the warning system will also be active when the inducement system is active has not been mentioned in the illustrations given.
A.2.5.2. Figure 2 illustrates the operation of the activation and deactivation mechanisms when monitoring the reagent availability for five cases:
                  (a) Use case 1: the driver continues operating the vehicle in spite of the warning until vehicle operation is disabled;
                  (b) Repair case 1 ("adequate" refilling): the driver refills the reagent tank so that a level above the 10 per cent threshold is reached. Warning and inducement are de-activated;
                  (c) Repair cases 2 and 3 ("inadequate" refilling): the warning system is activated. The level of warning depends on the amount of available reagent;
                  (d) Repair case 4 ("very inadequate" refilling): the low-level inducement is activated immediately.
       Figure 2
       Reagent availability
A.2.5.3. Figure 3 illustrates three cases of wrong urea quality:
                  (a) Use case 1: the driver continues operating the vehicle in spite of the warning until vehicle operation is disabled;
                  (b) Repair case 1 ("bad" or "dishonest" repair): after disablement of the vehicle, the driver changes the quality of the reagent, but, soon after, changes it again for a poor quality one. The inducement system is immediately reactivated and vehicle operation is disabled after 2 engine operating hours;
                  (c) Repair case 2 ("good" repair): after disablement of the vehicle, the driver rectifies the quality of the reagent. However, some time afterwards, he refills again with a poor quality reagent. The warning, inducement, and counting processes restart from zero.
           Figure 3
           Filling with poor reagent quality
A.2.5.4. Figure 4 illustrates three cases of failure of the urea dosing system. This figure also illustrates the process that applies in the case of the monitoring failures described in paragraph 9. of this annex:
                  (a) Use case 1: the driver continues operating the vehicle in spite of the warning until vehicle operation is disabled;
                  (b) Repair case 1 ("good" repair): after disablement of the vehicle, the driver repairs the dosing system. However, some time afterwards, the dosing system fails again. The warning, inducement, and counting processes restart from zero;
                  (c) Repair case 2 ("bad" repair): during the low-level inducement time (torque reduction), the driver repairs the