ADAPTIVE ERROR CORRECTION CONTROL SYSTEM FOR OPTIMIZING STIRLING REFRIGERATOR OPERATION

摘要

An adaptive control includes a digital error correction system (DECS) (51) to re duce control system error to near zero by anticipating a problem and feeding forward in time a correction to deal with the problem before it happens. The adaptive control is used in a controlled system of the kind which is cyclical in operation and wh ich operates in response to repetitive cycle commands so that the operation of the system is substantially predictable for a significa nt number of cycles of operation. The adaptive control is incorporated in a refrigerator system in which two Stirling cycle refrigerators are mounted in opposition to one another. The adaptative control permits accurate control of the command waveform frequency and shape, enables the refrigerator system to be more thermodynamically efficient, and enables the two refrigerators to exactly cancel each other's vibration.