ADAPTIVE ERROR CORRECTION CONTROL SYSTEM FOR OPTIMIZING STIRLING REFRIGERATOR OPERATION

摘要

An adaptive control includes a digital error correction system (DECS) (51) to reduce control system error to near zero byanticipating a problem and feeding forward in time a correction to deal with the problem before it happens. The adaptive controlis used in a controlled system of the kind which is cyclical in operation and which operates in response to repetitive cycle commandsso that the operation of the system is substantially predictable for a significant number of cycles of operation. Theadaptive control is incorporated in a refrigerator system in which two Stirling cycle refrigerators are mounted in opposition to oneanother. The adaptative control permits accurate control of the command waveform frequency and shape, enables the refrigeratorsystem to be more thermodynamically efficient, and enables the two refrigerators to exactly cancel each other's vibration.