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With the development of automobile technology, the refrigeration compressor of automotive air conditioning has been controlled by the original pure mechanical compressor, and developed to the internal control of variable displacement of machinery, and then to the current variable displacement compressor technology. Electronically controlled variable displacement compressor is more adaptable and adaptable to a variety of models as long as the control program is changed, and it can realize the stepless regulation, more oil saving and no impact. At present, the technology is used more and more in the domestic model, and many maintenance technicians are often helpless when they meet the model of the variable displacement compressor. The following is a brief introduction to the principle and troubleshooting of variable displacement compressor.