Document ID: chunk:federal_register_of_legislation:F2023L00129:reg:99:p26
Version: federal_register_of_legislation:F2023L00129
Segment Type: reg
Provision Reference: reg 99 (pt 26/39)
Character Range: 1226206–1230118

HDDF engines and vehicles - illustration of the definitions and requirements

              Appendix 2 Activation and deactivation mechanisms of the counter(s), warning system, operability restriction, service mode in case of dual fuel engines and vehicles- Description and illustrations

              Appendix 3 HDDF dual-fuel indicator, warning system, operability restriction - Demonstration requirements

       Appendix 4 Additional emission test procedure requirements for dual-fuel engines

              Appendix 5 Additional PEMS emission test procedure requirements for dual-fuel engines

              Appendix 6 Determination of molar component ratios and ugas values for dual-fuel engines

                   Annex 15 - Appendix 1 Types of HDDF engines and vehicles - illustration of the definitions and main requirements
                                                                                                   GERWHTC1                     Idle on diesel               Warm-up on diesel             Operation on diesel solely              Operation in absence of gas  Comments
Type 1A                                                                                            GERWHTC ≥ 90 %               NOT Allowed                  Allowed only on service mode  Allowed only on service mode            Service mode
Type 1B                                                                                            GERWHTC ≥ 90 %               Allowed only on Diesel mode  Allowed only on diesel mode   Allowed only on diesel & service modes  Diesel mode
Type 2A                                                                                            10 % < GERWHTC < 90 %        Allowed                      Allowed only on service mode  Allowed only on service mode            Service mode                 GERWHTC ≥ 90 % allowed
Type 2B                                                                                            10 % < GERWHTC < 90 %        Allowed                      Allowed only on diesel mode   Allowed only on diesel & service modes  Diesel mode                  GERWHTC ≥ 90 % allowed
Type 3A                                                                                            NEITHER DEFINED NOR ALLOWED
Type 3B                                                                                            GERWHTC ≤ 10 %               Allowed                      Allowed only on diesel mode   Allowed only on diesel & service modes  Diesel mode
   1 This average Gas Energy Ratio GERWHTC is calculated over the hot part of the WHTC test-cycle

                  Annex 15 - Appendix 2 Activation and deactivation mechanisms of the counter(s), warning system, operability restriction, service mode in case of dual-fuel engines and vehicles - Description and illustrations
              A.2.1. Description of the counter mechanism

       A.2.1.1. General

              A.2.1.1.1. To comply with the requirements of this annex, the system shall contain a counter to record the number of hours during which the engine has been operated while the system has detected a malfunctioning gas supply.

              A.2.1.1.2. This counter shall be capable of counting up to 30 minutes operating time. The counter intervals shall be no longer than 3 minutes. When reaching its maximum value permitted by the system, it shall hold that value unless the conditions allowing the counter to be reset to zero are met.

       A.2.1.2. Principle of the counter mechanism

       A.2.1.2.1. The counters shall operate as follows:

              A.2.1.2.1.1.  If starting from zero, the counter shall begin counting as soon as a malfunctioning gas supply is detected according to paragraph 7.2 of this annex and the corresponding diagnostic trouble code (DTC) has the status confirmed and active.

              A.2.1.2.1.2.  The counter shall halt and hold its current