Document ID: chunk:federal_register_of_legislation:F2014C01109:body:0:p34
Version: federal_register_of_legislation:F2014C01109
Segment Type: other
Provision Reference: 
Character Range: 99500–102367

Understeer information.  An outline description of the pertinent inputs to the computer that control ESC system hardware and how they are used to limit vehicle understeer.

       4. TEST CONDITIONS

       4.1. Ambient conditions

       4.1.1. The ambient temperature is between 0 °C and 45 °C.

       4.1.2. The maximum wind speed is no greater than 10 m/s for vehicles with SSF > 1.25, and 5 m/s for vehicles with SSF ≤ 1.25.

       4.2. Road test surface

       4.2.1. Tests are conducted on a dry, uniform, solid-paved surface.  Surfaces with irregularities and undulations, such as dips and large cracks, are unsuitable.

       4.2.2. The road test surface has a nominal [3]/ peak braking coefficient (PBC) of 0.9, unless otherwise specified, when measured using either:

       4.2.2.1. The American Society for Testing and Materials (ASTM) E1136 standard reference test tyre, in accordance with ASTM Method E1337‑90, at a speed of 40 mph; or

       4.2.2.2. The k-test method specified in Appendix 2 – Attachment 5 of this standard.

       4.2.3. The test surface has a consistent slope between level and 1 per cent.

       4.3. Vehicle conditions

       4.3.1. The ESC system is enabled for all testing.

       4.3.2. Vehicle mass.  The vehicle is loaded with the fuel tank filled to at least 75 per cent of capacity, and a total interior load of 168 kg comprised of the test driver, approximately 59 kg of test equipment (automated steering machine, data acquisition system and the power supply for the steering machine), and ballast as required to make up for any shortfall in the weight of test drivers and test equipment.  Where required, ballast shall be placed on the floor behind the passenger front seat or if necessary in the front passenger foot well area.  All ballast shall be secured in a way that prevents it from becoming dislodged during testing.

       4.3.3. Tyres.  The tyres are inflated to the vehicle manufacturer's recommended cold inflation pressure(s) e.g. as specified on the vehicle's placard or the tyre inflation pressure label.  Tubes may be installed to prevent tyre de-beading.

       4.3.4. Outriggers.  Outriggers may be used for testing if deemed necessary for test drivers' safety.  In this case, the following applies for vehicles with a Static Stability Factor (SSF) ≤ 1.25:

       4.3.4.1. Vehicles with a mass in running order under 1,588 kg shall be equipped with "lightweight" outriggers.  Lightweight outriggers shall be designed with a maximum mass of 27 kg and a maximum roll moment of inertia of 27 kg∙m2.

       4.3.4.2. Vehicles with a mass in running order between 1,588 kg and 2,722 kg shall be equipped with "standard" outriggers.  Standard outriggers shall be designed with a maximum mass of 32 kg and a maximum roll moment of inertia of 35.9 kg∙m2.

       4.3.4.3. Vehicles with a mass in