Method and apparatus for changing operational modes of a transpo

Details Method and apparatus for changing operational modes of a transpo Method and apparatus for changing operational modes of a transpo

1998-09-18

2000-02-22

Bennett, Henry

Automatic temperature and humidity regulation

Thermostatic

Hot and cold

62209, 165291, G05D 2300

Patent

active

060270314

ABSTRACT:
A method and apparatus for changing operational modes of a transport refrigeration unit, where the unit is capable of operating in a continuous heating/cooling mode or an automatic start/stop heating/cooling mode. A supply air temperature sensor measures the temperature of the air exiting the unit, a return air temperature sensor measures the temperature of the air returning to the unit, and an ambient air temperature sensor measures the temperature of the ambient air outside the unit. A controller electrically connected to the sensors determines if the ambient air temperature is above or below a pre-determined setpoint temperature, determines if the temperature differential across the return and supply air sensors is above or below a pre-determined upper threshold or a pre-determined lower threshold, and then changes the operational mode of the unit based upon such determinations and the prior operational mode of the unit.

REFERENCES:
patent: 4211089 (1980-07-01), Mueller et al.
patent: 4250716 (1981-02-01), Huffman
patent: 4460036 (1984-07-01), Yoshimi et al.
patent: 4509586 (1985-04-01), Watabe
patent: 4899549 (1990-02-01), Berge et al.
patent: 5209072 (1993-05-01), Truckenbrod et al.
patent: 5860594 (1999-01-01), Reason et al.

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