Method of determining the thermal state of a substance in cold condition
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United States of America Patent
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Aug 1, 2017
Grant Date -
Jan 15, 2015
app pub date -
Jul 15, 2014
filing date -
Jul 15, 2013
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Abstract
A method of determining a thermal state or a thermal state transition of a substance based on how much liquid phase is available is disclosed. The method includes: (a) determining a current thermal state of the substance when the internal combustion engine is switched on based on a tank temperature and on a time interval during which the engine is switched off; and (b) calculating a percentage of the liquid phase in case the thermal state is a mixture of solid phase and liquid phase based on a total mass of the substance in the tank, a heat amount supplied to the tank, a heat exchange of the tank with an external environment; and (c) detecting the thermal state transitions based on said tank temperature and its time derivative and on said percentage of the liquid phase.
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