Division 2.3.4 Cold temperature operation

An auxiliary emission control strategy may be activated on an engine equipped with exhaust gas recirculation (EGR) irrespective of the control conditions in point 2.4 if the ambient temperature is below 275 K (2 °C) and one of the two following criteria is met:

1. (a)

   intake manifold temperature is less than or equal to the temperature defined by the following equation: IMT_c = P_IM/15,75 + 304,4, where: IMT_c is the calculated intake manifold temperature, K and P_IM is the absolute intake manifold pressure in kPa;

2. (b)

   engine coolant temperature is less than or equal to the temperature defined by the following equation: ECT_c = P_IM/14,004 + 325,8, where: ECT_c is the calculated engine coolant temperature, K and P_IM is the absolute intake manifold pressure, kPa.