Patent ID: 8948920
Filing Date: 2015-02-03
Classification: G05D

Abstract:
1. A method of controlling temperature in a refrigerated transport container, the refrigerated transport container comprising at least a transport volume, a control unit, and a cooling space, one or more fans providing an air flow through the cooling space, where air passing through the cooling space passes at least a return air temperature sensor for measuring a return air temperature (Tret), a cooling unit, and a supply air temperature sensor for measuring a supply air temperature (Tsup), wherein the method comprises: controlling supply air temperature (Tsup) to bring temperatures in the transport volume within a desired temperature range around a first temperature set point (Tset); controlling the supply air temperature (Tsup) or a time-averaged function thereof to reach a temperature below said first temperature set point (Tset) during a first limited period of time; increasing the supply air temperature (Tsup) during a second limited period of time following said first period of time, so that the supply air temperature (Tsup) or a time-averaged function thereof at the end of said second period of time is within said desired temperature range; controlling the supply air temperature (Tsup) or a time-averaged function thereof to a supply air temperature set point (Tset_slave); setting the supply air temperature set point (Tset_slave) during said first period of time to a value below said first temperature set point (Tset); and increasing the supply air temperature set point (Tset_slave) during said second period of time, so that the supply air temperature set point (Tset_slave) at the end of said second period of time is equal to said first temperature set point (Tset).