Rate of change temperature control for transport refrigeration s

Details Rate of change temperature control for transport refrigeration s Rate of change temperature control for transport refrigeration s

1988-08-26

1990-02-27

Tanner, Harry B.

Refrigeration

Automatic control

Refrigeration producer

62157, 62229, 236 1EA, F25B 4900

Patent

active

049035029

ABSTRACT:
Methods and apparatus for controlling the load temperature of a transport refrigeration system to a selected set point temperature by operating modes which include a high capacity cooling mode and a lower capacity cooling mode. The rate of change of the load temperature is monitored by time and temperature integration when the lower capacity cooling mode is entered, to insure that the lower capacity cooling mode has adequate capacity to reduce the load temperature to set point within an acceptable period of time. If the set point temperature is not reached within a period of time which is a function of time, load temperature relative to set point, and the rate of change of load temperature relative to set point, a signal is provided which forces the system to the higher capacity cooling mode until the set point temperature is reached.

REFERENCES:
patent: 4143707 (1979-03-01), Lewis et al.
patent: 4265299 (1981-05-01), Harnosh
patent: 4325224 (1982-04-01), Howland
patent: 4338791 (1982-07-01), Stamp, Jr. et al.
patent: 4345714 (1982-08-01), Kojima
patent: 4419866 (1983-12-01), Howland
patent: 4467616 (1984-08-01), Kitauchi
patent: 4519215 (1985-05-01), Barnett
patent: 4539821 (1985-09-01), Tamura
patent: 4616485 (1986-10-01), Gillett et al.
patent: 4663725 (1987-05-01), Truckenbrod et al.

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