Patent attributes
The invention relates to a method for real-time performance check of transport refrigeration units comprising the steps of:comparing via controller temperature sensors by pairs and determining from these comparisons by pairs if one or more temperature sensors are defective or in some extent deviates from expected temperature readings;at the same time measuring/monitoring the mass flow of cooling agent through a compressor and through an evaporator expansion valve Vexp which the controller by comparison determines if mass flow through the compressor do not deviate more than 25% from the mass flow through that evaporator expansion valve Vexp;if said deviation of mass flow through the compressor is more than 25% different from said mass flow through the expansion device Vexp, an error signal is provided.
