利用小波包分析法,通过柴油机缸盖振动信号能量图诊断出喷油泵渗漏故障,并以此为依据,利用“能量-故障”模式,以柴油机缸盖振动信号为依据对喷油泵渗漏故障进行诊断。对缸盖正常和故障的能量图进行归一化,划分出各个频段的能量图,分析缸盖振动特征频带的能量图判断喷油泵是否渗漏,结果显示故障特征更加明显,表明该方法能够有效检测喷油泵渗漏故障。 Using wavelet packet analysis method, we can diagnose the leakage fault of injection pump through the vibration signal energy diagram of cylinder head of diesel engine. Based on this, we use “energy - fault” mode to detect the vibration of pump cylinder head Leakage fault diagnosis. The energy diagram of the normal and faulty cylinder head is normalized, the energy diagram of each frequency band is divided, and the energy diagram of the vibration characteristic band of the cylinder head is analyzed to judge whether the injection pump leaks. The result shows that the fault characteristic is more obvious, which shows that the method is effective Detection of injection pump leakage failure.