Method of controlling the capacity of a transport refrigeration

Details Method of controlling the capacity of a transport refrigeration Method of controlling the capacity of a transport refrigeration

1989-05-24

1990-04-24

Wayner, William E.

Refrigeration

Processes

Circulating external gas

62209, 62229, 236 78D, F25B 100

Patent

active

049189328

ABSTRACT:
A method of controlling a refrigeration system by determining an average air temperature by sensing and averaging evaporator return and discharge air temperatures, and developing an average error by using the average air temperature and a selected set point temperature. The average air temperature is then used to calculate a proportional error and an integral error, and the discharge air temperature is used to calculate a floor error. The proportional error, integral error and floor error are weighted by predetermined gain factors and then summed to provide an error signal which is used to modulate the capacity of the refrigeration system, with the control mode depending upon the location of the error signal relative to set point.

REFERENCES:
patent: 2396204 (1946-03-01), Pearce
patent: 3581986 (1971-06-01), Magri
patent: 3973618 (1976-08-01), Naley et al.
patent: 4355760 (1982-10-01), Ruby
patent: 4589060 (1980-05-01), Zinsmeyer
patent: 4663725 (1987-05-01), Truckenbrod
patent: 4715190 (1987-12-01), Han et al.

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