Periodic system diagnostic of a transport refrigeration system
AssigneeThermo King Corporation
InventorOmosola Waidi Olaleye
Life of this patent
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Abstract
Methods and systems for periodic system diagnostic of a TRS are provided. In particular, a TRS controller is configured to periodically activate an engine control unit (ECU) of a genset to acquire engine sensor information while the engine is not running. The TRS controller is configured to determine an efficient time to bring the ECU out of a minimum electrical power consumption stage into a medium power consumption stage in order to determine a next action of the TRS.
Claims19
A method for periodic system diagnostic of a transport refrigeration system for a refrigerated transport unit, the transport refrigeration system including a transport refrigeration unit controlled by a transport refrigeration system controller and powered by an electrically controlled engine having an engine control unit, the method comprising:
- the transport refrigeration system controller sending a medium electrical power consumption stage activation signal, via a keyswitch connection, to an electronic control unit when the electronically controlled engine is set to an engine operating mode in which the electronically controlled engine is not running, the medium electrical power consumption stage activation signal instructing the electronic control unit to activate and operate at a medium electrical power consumption stage;
- the transport refrigeration system controller obtaining engine sensor data from the electronic control unit via a Controller Area Network (CAN) communication interface bus;
- the transport refrigeration system controller determining a periodic system diagnostic time period based on the engine sensor data obtained from the electronic control unit.
A transport refrigeration system for a refrigerated transport unit, the transport refrigeration system comprising:
- an electronically controlled engine including an electronic control unit;
- a transport refrigeration unit attached to the refrigerated transport unit, the transport refrigeration unit including a transport refrigeration system controller;
- a Controller Area Network (CAN) communication interface bus configured to connect the transport refrigeration system controller to the electronic control unit, wherein the transport refrigeration system is programmed to receive engine sensor data from the electronic control unit via the CAN communication interface bus;
- and
- a keyswitch connection configured to connect the transport refrigeration system controller to the electronic control unit;
- wherein the transport refrigeration system controller is programmed to determine a periodic system diagnostic time period based on the engine sensor data obtained from the electronic control unit.
Dependencies are inferred from the claim text.