Document ID: chunk:federal_register_of_legislation:F2008C00323:reg:12:p1
Version: federal_register_of_legislation:F2008C00323
Segment Type: reg
Provision Reference: reg 12 (pt 1/7)
Character Range: 351177–354335

12            23           20.2          23           35.4

                                         24           35.6

 __________
Annex 8

TYPE VI TEST
          (Verifying the average exhaust emissions of carbon monoxideand hydrocarbons after a cold start at low ambient temperature)

        1. INTRODUCTION

        This Annex applies only to vehicles with positive-ignition engines. It describes the equipment required and the procedure for the Type VI test defined in paragraph 5.3.5 of this Regulation in order to verify the emissions of carbon monoxide and hydrocarbons at low ambient temperatures. Topics addressed in this Regulation include:

         1. equipment requirements;
         2. test conditions;
         3. test procedures and data requirements.

        2.  TEST EQUIPMENT

        2.1.  Summary

        2.1.1. This chapter deals with the equipment needed for low ambient temperature exhaust emission tests of positive-ignition engined vehicles. Equipment required and specifications are equivalent to the requirements for the Type I test as specified in Annex 4, with appendices, if specific requirements for the Type VI test are not prescribed. Paragraphs 2.2. to 2.6. describe deviations applicable to Type VI low ambient temperature testing.

        2.2.  Chassis dynamometer

        2.2.1. The requirements of paragraph 4.1. of Annex 4 apply. The dynamometer shall be adjusted to simulate the operation of a vehicle on the road at 266 K (–7 C). Such adjustment may be based on a determination of the road load force profile at 266 K
        (–7 C). Alternatively the driving resistance determined according to Appendix 3 of Annex 4 may be adjusted for a 10 per cent decrease of the coast-down time. The technical service may approve the use of other methods of determining the driving resistance.

        2.2.2. For calibration of the dynamometer the provisions of Appendix 2 to Annex 4 apply.

        2.3.  Sampling system

        2.3.1. The provisions of paragraph 4.2. of Annex 4 and Appendix 5 to Annex 4 apply. Paragraph 2.3.2. of Appendix 5 is modified to read:

        "The piping configuration, flow capacity of the CVS, and the temperature and specific humidity of the dilution air (which may be different from the vehicle combustion air source) shall be controlled so as to virtually eliminate water condensation in the system (a flow of 0.142 to 0.165 m3/s is sufficient for most vehicles)."

        2.4. Analytical equipment

        2.4.1. The provisions of paragraph 4.3. of Annex 4 apply, but only for carbon monoxide, carbon dioxide, and hydrocarbon testing.

        2.4.2. For calibrations of the analytical equipment the provisions of Appendix 6 to Annex 4 apply.

        2.5.  Gases

        2.5.1. The provisions of paragraph 4.5. of Annex 4 apply, where they are relevant.

        2.6. Additional equipment

        2.6.1. For equipment used for the measurement of volume, temperature, pressure and humidity the provisions in paragraphs 4.4. and 4.6. of Annex 4 apply.

        3. TEST SEQUENCE AND FUEL

        3.1. General requirements

        3.1.1. The test sequence in Figure 8/1 shows