Division 2.1 F1

Only vehicles which are identical with respect to all the following characteristics are permitted to be part of the same ATCT Family:

1. (a)

   Powertrain architecture (i.e. internal combustion, hybrid, fuel cell, or electric);

2. (b)

   Combustion process (i.e. two stroke or four stroke);

3. (c)

   Number and arrangement of cylinders;

4. (d)

   Method of engine combustion (i.e. indirect or direct injection);

5. (e)

   Type of cooling system (i.e. air, water, or oil);

6. (f)

   Method of aspiration (i.e. naturally aspirated, or charged);

7. (g)

   Fuel for which the engine is designed (i.e. petrol, diesel, NG, LPG, etc.);

8. (h)

   Catalytic converter (i.e. three-way catalyst, lean NO_x trap, SCR, lean NO_x catalyst or other(s));

9. (i)

   Whether or not a particulate trap is installed; and

10. (j)

    Exhaust gas recirculation (with or without, cooled or non-cooled).

In addition the vehicles shall be similar with respect to the following characteristics:

1. (k)

   The vehicles shall have a variation in engine cylinder capacity of no more than 30 % of the vehicle with the lowest capacity; and

2. (l)

   Engine compartment insulation shall be of a similar type regarding material, amount and location of the insulation. Manufacturers shall provide evidence (e.g. by CAD drawings) to the approval authority that for all vehicles in the family, the volume and weight of the insulation material which will be installed is greater than 90 % of that of the ATCT measured reference vehicle.

Difference in insulation material and location may also be accepted to be part of a single ATCT family under the condition that the test vehicle can be demonstrated as being the worst case with regards to engine compartment insulation.