Document ID: chunk:federal_register_of_legislation:F2023L00129:reg:99:p20
Version: federal_register_of_legislation:F2023L00129
Segment Type: reg
Provision Reference: reg 99 (pt 20/39)
Character Range: 1208151–1212235

PEMS test, whether a PEMS test at certification or a PEMS test when checking and demonstrating the conformity of in-service engines and vehicles, should be determined on the basis of the actual GER calculated from the fuel consumption measured over the on-road test.

               However, in absence of a robust way to measure the gas or the diesel fuel consumption, the manufacturer is allowed to use the GERWHTC determined on the hot part of the WHTC and calculated according to this annex.

              6. Demonstration requirements

              6.1. Dual-fuel engines shall be subject to the laboratory tests specified in Table 1.

Table 1
Laboratory tests to be performed by a dual-fuel engine
                           Type 1A                          Type 1B                          Type 2A                               Type 2B                               Type 3B
                                                            Dual-fuel mode:                                                        Dual-fuel mode:
WHTC                       NMHC; CH4; CO; NOx; PM; PN; NH3                                   THC; NMHC; CH4; CO; NOx; PM; PN; NH3                                        THC; CO; NOx; PM; PN; NH3
                                                            NMHC; CH4; CO; NOx; PM; PN; NH3                                        THC; NMHC; CH4; CO; NOx; PM; PN; NH3
Diesel mode:               Diesel mode:

THC; CO; NOx; PM; PN; NH3  THC; CO; NOx; PM; PN; NH3
                                                            Dual-fuel mode:                                                        Dual-fuel mode:
WHSC                       no test                                                           NMHC; CO; NOx; PM; PN; NH3                                                  THC; CO; NOx; PM; PN; NH3
                                                            no test                                                                NMHC; CO; NOx; PM; PN; NH3
Diesel mode:               Diesel mode:

THC; CO; NOx; PM; PN; NH3  THC; CO; NOx; PM; PN; NH3
                                                            Dual-fuel mode:                                                        Dual-fuel mode:
WNTE laboratory test       no test                                                           [HC]; CO; NOx; PM                                                           THC; CO; NOx; PM
                                                            no test                                                                [HC]; CO; NOx; PM
Diesel mode:               Diesel mode:

THC; CO; NOx; PM           THC; CO; NOx; PM

6.2. Demonstrations in case of installation of type-approved HDDF engines
              In addition to the requirements of this Regulation related to the installation of an engine that is type-approved as separate technical unit, a demonstration of the correct installation on a vehicle of a dual-fuel engine shall be done on the basis of appropriate elements of design, results of verification tests, etc. It shall address the conformity of the following elements to the requirements of this annex:

                  (a) The dual-fuel indicators and warnings as specified in this annex (pictogram, activation schemes, etc.);

           (b) The fuel storage system;

           (c) The performance of the vehicle in service mode.

              Correct indicator illumination and warning system activation will be checked.  But any check shall not force dismounting the engine system (e.g. an electric disconnection may be selected).

              6.3. Demonstration requirements in case of a Type 2 engine

              The manufacturer shall present the Type Approval Authority with evidence showing that the GERWHTC span of all members of the dual-fuel engine family remains within the percentage specified in paragraph 3.1.1. (for example, through algorithms, functional analyses, calculations, simulations, results of previous tests, etc.).

              6.4. Additional demonstration requirements in case of a universal fuel