Because of the complexity of ICE, the general mechanical fault diagnosis techniques are difficult to be applied in the diagnosis of ICE, so the condition monitoring and fault diagnosis techniques must be developed to fit in the characteristics of ICE.

• 而由于内燃机的复杂性,一般的机械故障诊断技术也难以直接应用于内燃机故障诊断,因此,必须发展针对内燃机特点的状态监测和故障诊断技术。