Regulation (EC) No 1222/2009 of the European Parliament and of the CouncilShow full title

[F1 4.2.2 Equipment U.K.

4.2.2.1 Tow vehicle and trailer or tyre test vehicle U.K.

• The tow vehicle or the tyre test vehicle shall have the capability of maintaining the specified speed of 65 ± 2 km/h even under the maximum braking forces.

• The trailer or the tyre test vehicle shall be equipped with one place where the tyre can be fitted for measurement purposes hereafter called ‘ test position ’ and the following accessories:

  (i)

  equipment to activate brakes in the test position;

  (ii)

  a water tank to store sufficient water to supply the road surface wetting system, unless external watering is used;

  (iii)

  recording equipment to record signals from transducers installed at the test position and to monitor water application rate if the self-watering option is used.

• The maximum variation of toe-settings and camber angle for the test position shall be within ± 0,5 ° with maximum vertical load. Suspension arms and bushings shall have sufficient rigidity necessary to minimise free play and ensure compliance under application of maximum braking forces. The suspension system shall provide adequate load-carrying capacity and be of such a design as to isolate suspension resonance.

• The test position shall be equipped with a typical or special automotive brake system which can apply sufficient braking torque to produce the maximum value of braking test wheel longitudinal force at the conditions specified.

• The brake application system shall be able to control the time interval between initial brake application and peak longitudinal force as specified in section 4.2.7.1.

• The trailer or the tyre test vehicle shall be designed to accommodate the range of candidate tyre sizes to be tested.

• The trailer or the tyre test vehicle shall have provisions for adjustment of vertical load as specified in section 4.2.5.2.

4.2.2.2 Measuring equipment U.K.

• The test wheel position on the trailer or the tyre test vehicle shall be equipped with a rotational wheel velocity measuring system and with transducers to measure the braking force and vertical load at the test wheel.

• General requirements for measurement system: The instrumentation system shall conform to the following overall requirements at ambient temperatures between 0 °C and 45 °C:

  (i)

  overall system accuracy, force: ± 1,5 % of the full scale of the vertical load or braking force;

  (ii)

  overall system accuracy, speed: ± 1,5 % of speed or ± 1,0 km/h, whichever is greater.

• Vehicle speed: To measure vehicle speed, a fifth wheel or non-contact precision speed-measuring system should be used.

• Braking forces: The braking force-measuring transducers shall measure longitudinal force generated at the tyre–road interface as a result of brake application within a range from 0 % to at least 125 % of the applied vertical load. The transducer design and location shall minimise inertial effects and vibration-induced mechanical resonance.

• Vertical load: The vertical load-measuring transducer shall measure the vertical load at the test position during brake application. The transducer shall have the same specifications as described previously.

• Signal conditioning and recording system: All signal conditioning and recording equipment shall provide linear output with necessary gain and data reading resolution to meet the specified previous requirements. In addition, the following requirements apply:

  (i)

  The minimum frequency response shall be flat from 0 Hz to 50 Hz (100 Hz) within ± 1 % full scale.

  (ii)

  The signal-to-noise ratio shall be at least 20/1.

  (iii)

  The gain shall be sufficient to permit full-scale display for full-scale input signal level.

  (iv)

  The input impedance shall be at least 10 times larger than the output impedance of the signal source.

  (v)

  The equipment shall be insensitive to vibrations, acceleration, and changes in ambient temperature.]

Textual Amendments

F1 Inserted by Commission Regulation (EU) No 228/2011 of 7 March 2011 amending Regulation (EC) No 1222/2009 of the European Parliament and of the Council with regard to the wet grip testing method for C1 tyres (Text with EEA relevance).