Method and apparatus for monitoring a transport...

G - Physics – 05 – D

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G05D 23/19 (2006.01) B60P 3/20 (2006.01) F25D 29/00 (2006.01)

Patent

CA 2023980

55,503 ABSTRACT OF THE DISCLOSURE A monitor for a transport refrigeration unit in which the temperature of the air discharged by the unit into a load space is compared with the temperature of air returning to the unit, to provide a signal DI responsive to the algebraic difference. Signal DI, which represents the actual conditioning mode, is compared with a commanded conditioning mode signal provided by a thermostat associated with the transport refrigeration unit, and also with predetermined reference values, to detect incorrect operating modes, as well as significant loss of refrigerant capacity. Timers initiate resettable time delays in response to such detections, after which warning and shut-down signals are respectively provided when certain time delays are allowed to expire. Logic signals provided by the monitor are logically related when the monitor shuts the system down to drive a diagnostic display which indicates the cause of shut down.

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