Document ID: chunk:federal_register_of_legislation:F2024L00446:reg:23:p14
Version: federal_register_of_legislation:F2024L00446
Segment Type: reg
Provision Reference: reg 23 (pt 14/15)
Character Range: 1935334–1938453

requires use of an ageing bench with an engine as the source of feed gas for the system.

               During the SDBC, the regeneration/desulphurisation strategies of the system shall remain in normal operating condition.

              2. The SDBC reproduces the engine speed and load conditions that are encountered in the SRC cycle as appropriate to the period for which durability is to be determined. In order to accelerate the process of ageing, the engine settings on the test bench may be modified to reduce the system loading times. For example the fuel injection timing or EGR strategy may be modified.

              3. Ageing bench equipment and procedures

              3.1. The standard ageing bench consists of an engine, engine controller, and engine dynamometer. Other configurations may be acceptable (e.g. whole vehicle on a dynamometer, or a burner that provides the correct exhaust conditions), as long as the after-treatment system inlet conditions and control features specified in this appendix are met.

               A single ageing bench may have the exhaust flow split into several streams provided that each exhaust stream meets the requirements of this appendix. If the bench has more than one exhaust stream, multiple after-treatment systems may be aged simultaneously.

              3.2. Exhaust system installation. The entire after-treatment system, together with all exhaust piping which connects these components, will be installed on the bench. For engines with multiple exhaust streams (such as some V6 and V8 engines), each bank of the exhaust system will be installed separately on the bench.

               The entire after-treatment system will be installed as a unit for ageing. Alternatively, each individual component may be separately aged for the appropriate period of time.

              In case of exhaust after-treatment system using reagent, the whole injection system shall be fitted and working for ageing.

Annex C4 - Appendix 3

Standard Road Cycle (SRC)
              1. Introduction

               The Standard Road Cycle (SRC) is a kilometre accumulation cycle on VH. The vehicle may be run on a test track or on a kilometre accumulation dynamometer.

               The cycle consists of 7 laps of a 6 km course. The length of the lap may be changed to accommodate the length of the mileage accumulation test track.

       Standard road cycle

     Lap       Description                       Typical acceleration rate m/s²
     1         (start engine) idle 10 seconds    0
     1         Moderate acceleration to 48 km/h  1.79
     1         Cruise at 48 km/h for ¼ lap       0
     1         Moderate deceleration to 32 km/h  -2.23
     1         Moderate acceleration to 48 km/h  1.79
     1         Cruise at 48 km/h for ¼ lap       0
     1         Moderate deceleration to stop     -2.23
     1         Idle 5 seconds                    0
     1         Moderate acceleration to 56 km/h  1.79
     1         Cruise at 56 km/h for ¼ lap       0
     1         Moderate deceleration to 40 km/h  -2.23
     1         Moderate acceleration to 56