Document ID: chunk:federal_register_of_legislation:F2018C00341:body:0:p28
Version: federal_register_of_legislation:F2018C00341
Segment Type: other
Provision Reference: 
Character Range: 83119–86269

The braking functions have priority and shall be maintained in the normal and failed modes. The transmission of running gear information shall not delay braking functions. The power supply, provided by the ISO 7638 connector, shall be used exclusively for braking and running gear functions and that required for the transfer of trailer related information not transmitted via the electric 'Control Line'.

        However, in all cases, whenever power supplied by the ISO 7638:2003 connector is used for the functions defined in this paragraph above, the braking system shall have priority and be protected from an overload external to the braking system. This protection shall be a function of the braking system. The power supply for all other functions shall use other measures. Whenever power supplied by the ISO 7638:1997 connector is used for the functions defined above, the braking system shall have priority and be protected from an overload external to the braking system. This protection shall be a function of the braking system.

APPENDIX 2
Special Provisions for vehicles incorporating an Electronic Stability Control System and a Brake Assist System where required by Clause 4.1.1.1.

       The following is a modified form of Annex 9 of UNECE Regulation No. 13-H– UNIFORM PROVISIONS CONCERNING THE APPROVAL OF PASSENGER CARS WITH REGARD TO BRAKING, incorporating supplement 14 to the 00 series of amendments.

0.                                          DEFINITIONS
       0.1.                           "Ackerman steer angle" means the angle whose tangent is the wheelbase divided by the radius of the turn at a very low speed.
       0.2.                           "Electronic Stability Control System" or "ESC System" means a system that has all of the following attributes:
       0.3.                           That improves vehicle directional stability by at least having the ability to automatically control individually the braking torques of the left and right wheels on each axle [1]/ to induce a correcting yaw moment  based on the evaluation of actual vehicle behaviour in comparison with a determination of vehicle behaviour demanded by the driver;
       0.4.                           That is computer controlled with the computer using a closed-loop algorithm to limit vehicle oversteer and to limit vehicle understeer based on the evaluation of actual vehicle behaviour in comparison with a determination of vehicle behaviour demanded by the driver;
       0.5.                           That has a means to determine directly the value of the vehicle's yaw rate and to estimate its side-slip or side-slip derivative with respect to time;
       0.6.                           That has a means to monitor driver steering inputs; an
       0.7.                           That has an algorithm to determine the need, and a means to modify propulsion torque, as necessary, to assist the driver in maintaining control of the vehicle.
       0.8.                           "Lateral acceleration" means the component of the acceleration vector of a point in the vehicle perpendicular to the vehicle x axis (longitudinal)