Transport refrigeration system with control for top freezing avo

Details Transport refrigeration system with control for top freezing avo Transport refrigeration system with control for top freezing avo

1984-02-14

1985-01-15

Tanner, Harry

Refrigeration

With indicator or tester

Operatively correlated with automatic control

62158, 622285, 62229, 340588, 374103, F25B 4900, G05D 2319

Patent

active

044931913

ABSTRACT:
The circuit arrangement includes a first voltage divider including a temperature sensitive resistance 18 and resistor R1 which feed an analog signal through line 30 to comparators CP1-4, which also receive reference voltages from a second voltage divider comprising R2-5. CP1 goes high with a falling temperature of 26.degree. F. or lower, CP2 goes high when the temperature falls below 22.degree. F. and CP3 goes high when the temperature falls below 18.degree. F. A first timer 20 is turned on when any of the comparators are turned on and counts pulses from an R-C circuit including R8-11 and C1. Whether R8 and 9 are in the oscillator circuit depends upon whether the bilateral switches S2 and S3 controlled by the comparator CP2 and CP3 have shunted them out. Accordingly, the counting is speeded up as the temperature drops. When the variable timer 20 times out the flip-flop 28 is clocked, and the refrigerating capacity is reduced through relay 22 and a duration timer 26 is turned on to time the duration of the reduced refrigerating capacity. At the expiration of the fixed time, the refrigerating capacity is restored, and the timer 20 is turned back on if the discharge air temperature is sufficiently low to call for it to be on. The comparator CP4 functions to detect a shorted sensor 18, and keep the system from working if there is a short.

REFERENCES:
patent: 4187093 (1980-02-01), Boratgis et al.
patent: 4251999 (1981-02-01), Tanaka
patent: 4313308 (1982-02-01), Boratgis et al.
patent: 4407139 (1983-10-01), Ide et al.

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