A SYSTEM AND METHOD FOR CONTROLLING A REFRIGERATION SYSTEM

摘要

A method and system for operating a CO2 refrigeration system (20) is provided. Two pressures are controlled by two controllers (28) through two valves (30, 40) in this system. A first valve (30, 40) is actuated by a first controller (28) using a first transfer function in response to the first measured pressure. A second valve (30, 40) is actuated by a second controller (28) using a second transfer function in response to the second measured pressure. When it is determining the second valve (30, 40) failed to operate correctly, the first valve (30, 40) is actuated by a third controller (28) using a third transfer function.