关键词: 故障诊断, 数据压缩, LZW算法, 现场可编程门阵列（FPGA）

Abstract: To address the problem in excavator remote fault diagnosis system terminal that a huge amount of data collected can not be real-time transferred to remote diagnosis center. A variety of lossless data compression method is studied. Combined with the characteristics of the hardware resources, using the method Hash lookup dictionary, LZW compression algorithm is improved to increase the speed of data compression, and it is implemented in the FPGA. Simulation results show that the compression ratio is almost equal to the case of hardware than software, but the compression speed has been greatly improved, so that real-time fault diagnosis is guaranteed.

Key words: fault diagnosis, data compression, LZW algorithm, Field Programmable Gate Array（FPGA）