Control system for variable-capacity compressor in air condition

Details Control system for variable-capacity compressor in air condition Control system for variable-capacity compressor in air condition

Filed on

1991-05-31

Date issued

1992-09-22

Examiner

Wayner, William E.

Patent Class

Refrigeration

SubClass

Automatic control

SubSubClass

Refrigeration producer

Other Related Categories

236 78D, 318603, 364161, G05B 1302

Type

Patent

Status

active

Patent number

051486857

Description

ABSTRACT:
In an air conditioner including a variable-capacity compressor, a control system performs a PI calculation based on a temperature deviation between the actual temperature of the air downstream of an evaporator and its target temperature, thereby determining a control amount for controlling the capacity of the compressor. It is judged whether or not the sum of a proportional control component and an integral control component exceeds a limit value of the control amount corresponding to the maximum capacity of the compressor. If this judgment is in the affirmative, an ordinary integral calculation is stopped, and the integral control component is determined by subtracting the proportional control component from this limit value.

REFERENCES:
patent: 3938017 (1976-02-01), Hayes
patent: 4236202 (1980-11-01), Giles et al.
patent: 4918932 (1990-04-01), Gustafson et al.

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