Document ID: chunk:federal_register_of_legislation:F2014C01109:body:0:p40
Version: federal_register_of_legislation:F2014C01109
Segment Type: other
Provision Reference: 
Character Range: 115226–118391

be determined by computer simulation.

       1. USE OF THE SIMULATION

       1.1. The vehicle stability function shall be able to be demonstrated by the vehicle manufacturer to the 'Administrator' by simulating the dynamic manoeuvres of paragraph 5.9. of Appendix 2.

       1.2. The simulation shall be a means whereby the vehicle stability performance shall be demonstrated with:
            (a) The yaw rate, one second after completion of the Sine with Dwell steering input (time T0 + 1);
            (b) The yaw rate, 1.75 seconds after completion of the Sine with Dwell steering input;
            (c) The lateral displacement of the vehicle centre of gravity with respect to its initial straight path.

       1.3. The simulation shall be carried out with a validated modelling and simulation tool and using the dynamic manoeuvres of paragraph 5.9. of Appendix 2 under the test conditions of paragraph 4. of Appendix 2.

        The method by which the simulation tool is validated is given in Attachment 2 to this appendix.

     Appendix 2 - Attachment 2

         The following is a modified form of Annex 9 – Appendix 2 of UNECE Regulation No. 13-H– UNIFORM PROVISIONS CONCERNING THE APPROVAL OF PASSENGER CARS WITH REGARD TO BRAKING, incorporating supplement 7 and corrigendum to supplement 7 of the 00 series of amendments.

     DYNAMIC STABILITY SIMULATION TOOL AND ITS VALIDATION

       1. SPECIFICATION OF THE SIMULATION TOOL

       1.1. The simulation method shall take into account the main factors which influence the directional and roll motion of the vehicle.  A typical model may include the following vehicle parameters in an explicit or implicit form:
        (a) Axle/wheel
        (b) Suspension
        (c) Tyre
        (d) Chassis/vehicle body
        (e) Power train/driveline, if applicable
        (f) Brake system
        (g) Pay load

       1.2. The Vehicle Stability Function shall be added to the simulation model by means of:
        a) A subsystem (software model) of the simulation tool; or
        b) The electronic control box in a hardware-in-the-loop configuration.

       2. VALIDATION OF THE SIMULATION TOOL

       2.1. The validity of the applied modelling and simulation tool shall be verified by means of comparisons with practical vehicle tests.  The tests utilised for the validation shall be the dynamic manoeuvres of paragraph 5.9. of Appendix 2.

        During the tests, the following motion variables, as appropriate, shall be recorded or calculated in accordance with ISO 15037 Part 1:2005: General conditions for passenger cars or Part 2:2002: General conditions for heavy vehicles and buses (depending on the vehicle category):
        (a) Steering-wheel angle (H)
        (b) Longitudinal velocity (vX)
        (c) Sideslip angle () or lateral velocity (vY);(optional)
        (d) Longitudinal acceleration (aX); (optional)
        (e) Lateral acceleration (aY)
        (f) Yaw velocity (d/dt)
        (g) Roll velocity (d/dt)
        (h) Pitch velocity (d/dt)
        (i) Roll angle ()
        (j) Pitch angle ()

       2.2. The objective is to show that the simulated vehicle behaviour