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I looked at my Fiesta last night and the "reserve bottle" is pressurized like the rest of the system. I also though about measuring pressure and using it as the control signal since it would take some work to build a float in a pressurized reservoir.
Since you are heating the coolant in a closed system, it's logical to think the pressure in the reservoir would be directly proportional to the expansion of the coolant so with that understood I think measuring the pressure could perform the same function.
It just seems to me, and I would bet the manufacturers are looking at this idea, that the precision of measuring the rise in coolant levels would allow the system to anticipate the rise in coolant level and perform corrective actions with a radiator or grille block to keep the whole cooling system at a precisely consistent level, which would mean you could maintain that average temperature at the ideal level for maximum efficiency.
You would not eliminate the thermostat or cooling fan actuation as was discussed in the1916 document. You are controlling the huge variation in average cooling system temperature depending on ambient temperature in current systems.
This would eliminate the losses incurred when winter temps cause the exit coolant temperature to plummet and the first cylinders that coolant hits are colder than the last cylinder. That potential 100 degree variation in exit coolant temperatures makes the thermostat close to restrict coolant flow,which only serves to exacerbate the problem. The system I am proposing would eliminate temp variation, improve efficiency, reduce pollution and made the heater work exactly the same in winter as it would in summer. Not saying that you would use it in summer.
regards
mech
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