Process for monitoring the coolant level in a cooling system
AssigneeMercedes-Benz AG
InventorsWerner Salzer, Herbert Wieszt
Life of this patent
Estimating the term…
Abstract
A process for monitoring the coolant level in a cooling system, in particular in a motor vehicle in which the relative pressure and the temperature of the coolant are measured on the high-pressure side of the coolant circuit, using the measured pressure value. A temperature assigned to the pressure value is established on the basis of a coolant specific function (temperature=f (pressure)) and the undercooling of the coolant is then determined by subtracting the measured temperature from the assigned temperature, which undercooling is analyzed as a measure for the coolant level.
Claims14
Process for monitoring the amount of coolant in a cooling system of a motor vehicle, the relative pressure and the temperature T.sub.G of the coolant being measured on the high-pressure side of the coolant circuit, comprising:
- deriving the coolant temperature T from the measured pressure value on the basis of a stored coolant-specific function;
- determining undercooling U of the coolant by subtracting the measured coolant temperature T.sub.G from the derived coolant temperature T, the undercooling U providing values as a measure of the amount of coolant;
- comparing the undercooling U with at least one predetermined value;
- and
- at least one of activating an alarm signal and switching off the cooling system when the comparing of the undercooling U with the at least one pre-determined value indicates one of an overfilling and an underfilling of coolant in the cooling system.
Dependencies are inferred from the claim text.