Document ID: chunk:federal_register_of_legislation:F2018C00341:body:0:p35
Version: federal_register_of_legislation:F2018C00341
Segment Type: other
Provision Reference: 
Character Range: 102095–105060

characteristics.  This explanation shall include the outline description of the system's capability to apply braking torques at each wheel and how the system modifies propulsion torque during ESC system activation, and show that the vehicle yaw rate is directly determined even under the conditions where no wheel speed information is available.  The explanation shall also specify the vehicle speed range and the driving phases (acceleration, deceleration, coasting, during activation of the ABS or traction control) under which the ESC system can activate.

       3.7.3. Logic diagram.  This diagram supports the explanation provided under paragraph 3.7.2.

       3.7.4. 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 [4]/ 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 7 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 90 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