Arduino-based GUI for active grille block

[Piwoslaw]

Originally Posted by CigaR007

I have been observing the coolant temperature for the past few days. With the shutters SHUT, at constant speeds, as soon as the coolant temp reaches 95-96C, it stabilizes and gradually drops to 91C. The cycle repeats every 5 minutes or so.

This leads me to consider that the Radiator fan is running on low speed and the trigger temp seems to be around 96C.

This is a good example why knowing when the radiator fan is ON is useful.

That does seem correct. My turbodiesel's fan turns on at 98C and off when the temp drops below 90 or 91C.
The fan goes into 2nd stage, or high, if the coolant temp rises above 104C, iirc.

Ecodriving goal: Drive so efficiently that the engine does not waste enough energy to heat up to 96C.

[CigaR007]

Question then becomes : which of the following has a higher penalty ? The aero drag with shutters half-open or the increased electrical load to power the Rad Fan at low speed ?

Considering the vehicle has no alternator, the engine load might not change much given that the Hybrid DC-DC converter ultimately provides the power through the small 12V battery...

Soon enough, with colder temperatures, the coolant will probably not reach 95-96C.