Document ID: chunk:federal_register_of_legislation:F2023C00229:reg:5:p24
Version: federal_register_of_legislation:F2023C00229
Segment Type: reg
Provision Reference: reg 5 (pt 24/36)
Character Range: 487289–490378

range 275 K to 303 K (2 °C to 30 °C) (**) (***), and
            —      engine coolant temperature within the range 343 K to 373 K (70 °C to 100 °C).

          6.1.5.5.        An auxiliary emission control strategy (AECS) may be installed to an engine, or on a vehicle, provided that the operation of the AECS is included in the applicable type-approval test and is activated according to section 6.1.5.6.

          6.1.5.6.        The AECS is activated:

            —      only by on-board signals for the purpose of protecting the engine system (including air-handling device protection) and/or vehicle from damage,

       or

            —      for purposes such as operational safety, permanent emission default modes and limp-home strategies, or
            —      for such purposes as excessive emissions prevention, cold start or warming-up, or
            —      if it is used to trade-off the control of one regulated pollutant under specific ambient or operating conditions in order to main- tain control of all other regulated pollutants within the emission limit values that are appropriate for the engine in question. The overall effects of such an AECS is to compensate for naturally occurring phenomena and do so in a manner that provides accept- able control of all emission constituents.

          6.1.6.            Requirements for torque limiters

          6.1.6.1.        A torque limiter will be permitted if it complies with the requirements of section 6.1.6.2. or 6.5.5. In all other cases, a torque limiter shall be considered to be a defeat strategy.

          6.1.6.2.        A torque limiter may be installed to an engine, or on a vehicle, provided that:

            —      the torque limiter is activated only by on-board signals for the purpose of protecting the powertrain or vehicle construction from damage and/or for the purpose of vehicle safety, or for power take-off activation when the vehicle is stationary, or for measures to ensure the correct functioning of the deNOx system,

       and

            —      the torque limiter is active only temporarily, and
            —      the torque limiter does not modify the emission control strategy (ECS), and
            —      in case of power take-off or powertrain protection the torque is limited to a constant value, independent from the engine speed, while never exceeding the full-load torque,

       and

            —      is activated in the same manner to limit the performance of a vehicle in order to encourage the driver to take the necessary mea- sures in order to ensure the correct functioning of NOx control measures within the engine system.

          6.1.7.            Special requirements for electronic emission control systems

          6.1.7.1.        Documentation requirements

         The manufacturer shall provide a documentation package that gives access to any element of design and emission control strategy (ECS), and torque limiter of the engine system and the means by which it controls its output variables, whether that control is direct or indirect. The