Document ID: chunk:federal_register_of_legislation:F2025C00107:reg:4:p20
Version: federal_register_of_legislation:F2025C00107
Segment Type: reg
Provision Reference: reg 4 (pt 20/26)
Character Range: 142390–146052

and response);
               15.       Gearbox characteristic(s);
               16.       Drive train option(s) (e.g. retarder, regenerative braking, auxiliary propulsion system);
               17.       Brake characteristic(s);
               18.        'Antilock System' configuration;
               19.        'Wheelbase';
               20.         Track width;
               21.       Centre of gravity height;
               22.       Lateral acceleration sensor position;
               23.     Yaw rate sensor position; and
               24.       Loading.
     1.                            The 'Vehicle Stability Function' must be added to the simulation model by means of:
            1.       A subsystem (software model) of the simulation model; or
            1.       The electronic control box in a hardware-in-the-loop configuration.

 1.                                  Validation of the dynamic stability simulation
     1.                            The validity of the applied simulation and modelling must be verified by means of comparisons with practical vehicle tests.  The tests utilised for the validation must be the J-Turn test procedures of clause 6 of Annex 1 to this appendix.  The objective is to show that the simulated vehicle behaviour and operation of the 'Vehicle Stability Function' is comparable with that seen in practical vehicle tests.
     2.                            During the vehicle tests utilised for validation, the following motion variables, as appropriate, shall be recorded or calculated in accordance with ISO 15037 Part 2:2002 – General conditions for heavy vehicles and buses:
            1.       Steering-wheel angle (H);
            2.       Longitudinal velocity (vX);
            3.       Lateral acceleration (aY);
            4.       Yaw velocity (d/dt);
            5.       Roll velocity (d/dt);
            6.        Pitch velocity (d/dt);
            7.       Roll angle (); and
            8.       Pitch angle ().
     3.                            A simulator will be deemed to be validated, if its output is comparable to the practical test results produced by a given vehicle type during each of the dynamic manoeuvres specified in clause 6 of Annex 1 to this appendix.
         1.                     The simulation tool may only be used with regard to features for which a comparison has been made between real vehicle tests and simulation tool results.
         2.                     Comparisons must be carried-out in the fully laden condition for at least one variant of the vehicle type certified/approved with each of the following:
                1.       the shortest 'Wheelbase';
                2.       the longest 'Wheelbase'; and
                3.       the highest centre of gravity.
         3.                     In the case of a dynamic J-Turn manoeuvre, the relationship of activation and sequence of the 'Vehicle Stability Function' in the simulation and in the practical vehicle test shall be the means of making the comparison.
         4.                     The physical parameters that are different between the reference vehicle and simulated vehicle configurations must be modified accordingly in the simulation.
         5.                     The suitability of the simulation tool for use with any other parameters not validated by a practical vehicle test may be demonstrated by conducting simulations with varied parameter values.  The results of these simulations shall be checked to be logical and similar in comparison to the results of known practical vehicle tests.

APPENDIX 3 – Annex 3

    'Vehicle Stability Function' simulation