关键词: 长城哈弗 M6；自动空调制冷系统；压缩机；鼓风机；散热风扇；故障案例

Abstract: With the improvement of people's requirements for car ride comfort and the integration of electronic technology, sensor technology, computer control and network technology, automatic air conditioning system has been widely used in some middle and high-end passenger cars, and its control principle has great changes compared with traditional manual air conditioning. Taking the Great Wall Harvard M6 as an example, this paper introduces the composition, basic refrigeration principle and control circuit principle of automatic air conditioning and refrigeration system, combined with typical fault cases such as automatic air conditioning system not cooling, and demonstrates from the aspects of fault phenomenon, fault cause analysis, fault diagnosis, principle hypothesis, principle verification, fault troubleshooting, summary reflection and so on. Through typical fault cases, the control principle of automatic air conditioning and refrigeration system is verified, the theoretical application ability is improved, the diagnostic ideas are established, and certain references are provided for teachers, students and maintenance technicians of automotive majors in vocational colleges.

Key words: Great Wall Harvard M6; automatic air conditioning refrigeration system; compressor; blower; cooling fan; fault case