Document ID: chunk:federal_register_of_legislation:F2023L00129:reg:10:p148
Version: federal_register_of_legislation:F2023L00129
Segment Type: reg
Provision Reference: reg 10 (pt 148/150)
Character Range: 1137736–1141003

may not have to be added if, by increasing the lubricant consumption as described in paragraph 2.4.4.8.4., the needed lubricant consumption is already achieved with the conduction of the corresponding thermal accumulation schedule consisting of the performance of NTS thermal sequences or modified thermal sequences.

              2.4.4.8. Development of the lubricant consumption accumulation schedule

              2.4.4.8.1. The lubricant consumption accumulation schedule shall consist of a number of lubricant consumption sequences repeated several times, each lubricant consumption sequence being alternated with each thermal sequence or each modified thermal sequence.

              2.4.4.8.2. Each lubricant consumption sequence shall consist of a steady mode at constant load and speed, the load and the speed being selected in such a way that the lubricant consumption is maximized and effective thermal aging is minimized. The mode shall be determined by the manufacturer in agreement with the Type Approval Authority, based on best engineering judgement.

              2.4.4.8.3. The duration of each lubricant consumption sequence shall be determined as follows:

              2.4.4.8.3.1. The engine shall be run for an appropriate period of time at the load and speed determined by the manufacturer in accordance with paragraph 2.4.4.8.2. and the lubricant consumed, in g/h, shall be determined using any suitable method, as for example the drain and weigh procedure described in Appendix 7. Lubricant changes are to be completed at the recommended intervals.

              2.4.4.8.3.2. The duration of each lubricant consumption sequence shall be calculated by applying the following equation:

              Equation 8:

              Where:

              tLS = the duration, in hours, of a single lubricant consumption sequence LCRWHTC = lubricant consumption rate, in g/h determined as set out in paragraph 2.2.15.

              tWHTC = equivalent number of hours corresponding to the vehicle category for which the replacement pollution control device is intended, obtained from Table 1.

              LCRTAS = lubricant consumption rate, in g/h, determined as set out in paragraph 2.4.4.2.

              LCRLAS = lubricant consumption rate, in g/h, determined as set out in paragraph 2.4.4.8.3.1.

              tTS = duration, in hours, of a single thermal sequence, as set out in Appendix 4, or modified thermal sequence, as set out in paragraph 2.4.3.2.

              NTS = total number of thermal sequences or modified thermal sequences to be carried out during the service accumulation schedule.

              2.4.4.8.4. The lubricant consumption rate shall always remain below 0.5 per cent of the engine fuel consumption rate in order to avoid excessive ash accumulation on the front face of the replacement pollution control device.

              2.4.4.8.5. It is allowed to add the thermal ageing due to the conduction of the lubricant consumption sequence to the AE calculated in equation 4.

              2.4.5. Development of the complete service accumulation schedule

              2.4.5.1. The service accumulation schedule shall be built up alternating a thermal or a modified thermal sequence, as appropriate, with