Method of operating a transport refrigeration unit

Details Method of operating a transport refrigeration unit Method of operating a transport refrigeration unit

1991-07-11

1992-08-25

Wayner, William E.

Refrigeration

Processes

Compressing, condensing and evaporating

62126, 622283, 1231425R, 731172, F02N 1702

Patent

active

051408260

ABSTRACT:
A method of operating a transport refrigeration system having a refrigerant compressor driven by an internal combustion engine. Microprocessor based electrical control maintains the temperature of a conditioned space at a desired set point via heating, cooling and null cycles, with the engine being started and stopped, as required. During the engine starting process, a suction line modulation valve, if used, is closed, engine pre-heat time is selected, including using engine temperature to access a look-up table, and current draw is checked during pre-heat. Excessive current terminates pre-heat. Control diagnostics checks the voltage level on both sides of a refrigerant high pressure switch, before initiating engine cranking. Prior to stopping the engine, a control option initiates a heating cycle for a short time when null is being entered from a cooling cycle, to warm the evaporator and prevent premature starting of the engine.

REFERENCES:
patent: 4050297 (1977-09-01), Pettingell et al.
patent: 4419866 (1983-12-01), Howland
patent: 4663725 (1987-05-01), Truckenbrod et al.
patent: 4878465 (1989-11-01), Hanson et al.
patent: 4918932 (1990-04-01), Gustafson et al.
patent: 4977751 (1990-12-01), Hanson
patent: 4977752 (1990-12-01), Hanson
patent: 5063513 (1991-11-01), Shank et al.

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