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介绍了一种利用东风4型机车原有的转速传感器结合8031单片微机测量东风4型机车柴油机转速的新方法。现场使用证明，与其它测速方法相比，该方法具有操作简便，测量精度高，系统工作稳定可靠等优点，是国产东风4型机车柴油机转速测量中较理想的一种测速方法。
A new method of measuring the rotational speed of DF4 locomotive diesel engine by using the original speed sensor of Dongfeng 4 locomotive combined with 8031 single chip microcomputer is introduced. Compared with other speed measurement methods, this method has the advantages of simple operation, high measurement accuracy and stable and reliable system operation compared with other speed measurement methods. It is an ideal speed measurement method for the domestic diesel engine speed measurement of the Dongfeng 4 locomotive.