Document ID: chunk:federal_register_of_legislation:F2011C00805:reg:3:p10
Version: federal_register_of_legislation:F2011C00805
Segment Type: reg
Provision Reference: reg 3 (pt 10/18)
Character Range: 323655–326427

the soak area. The vehicle is parked for a minimum of 12 hours and a maximum of 36 hours. The engine oil and coolant temperatures shall have reached the temperature of the area or within  3 K of it at the end of the period.

          5.4.  Dynamometer test

          5.4.1.  After conclusion of the soak period the vehicle is driven through a complete Type I test drive as described in Annex 4 (cold start urban and extra urban test). Then the engine is shut off. Exhaust emissions may be sampled during this operation but the results shall not be used for the purpose of exhaust emission type approval.

          5.4.2. Within two minutes of completing the Type I test drive specified in paragraph 5.4.1. above the vehicle is driven a further conditioning drive consisting of one urban test cycle (hot start) of a Type I test. Then the engine is shut off again. Exhaust emissions need not be sampled during this operation.

          5.5. Hot soak evaporative emissions test

          5.5.1. Before the completion of the test run the measuring chamber shall be purged for several minutes until a stable hydrocarbon background is obtained. The enclosure mixing fan(s) shall also be turned on at this time.

          5.5.2.  The hydrocarbon analyser shall be zeroed and spanned immediately prior to the test.

          5.5.3.  At the end of the driving cycle the engine bonnet shall be completely closed and all connections between the vehicle and the test stand disconnected. The vehicle is then driven to the measuring chamber with a minimum use of the accelerator pedal. The engine shall be turned off before any part of the vehicle enters the measuring chamber. The time at which the engine is switched off is recorded on the evaporative emission measurement data recording system and temperature recording begins. The vehicle's windows and luggage compartments shall be opened at this stage, if not already opened.

          5.5.4.  The vehicle shall be pushed or otherwise moved into the measuring chamber with the engine switched off.

          5.5.5.  The enclosure doors are closed and sealed gas-tight within two minutes of the engine being switched off and within seven minutes of the end of the conditioning drive.

          5.5.6. The start of a 60  0.5 minute hot soak period begins when the chamber is sealed. The hydrocarbon concentration, temperature and barometric pressure are measured to give the initial readings CHCi, Pi and Ti for the hot soak test. These figures are used in the evaporative emission calculation, paragraph 6. below. The ambient  temperature T of the enclosure shall not be less than 296 K and no more than 304 K during the 60-minute hot soak period.

          5.5.7.  The hydrocarbon analyser shall be zeroed and spanned