随着汽车保有量的增加,汽车发动机诊断技术也在不断发展。目前,发动机的诊断方法很多,但大多数方法都只能对已发生的故障进行诊断,而不能对即将发生的故障进行预测。这样,在一般情况下只有当故障明显暴露——即发生恶性损坏之后才能进行修理,增加了维修费用、维修时间,造成人力、物力的浪费。例如,曲轴轴颈与轴承,活塞与缸套,活塞销与铜套等配合件,在液体润滑条件下,机械损伤与磨损都很小。如果上述磨 As car ownership increases, automotive engine diagnostics are also evolving. At present, there are many ways of diagnosing engines, but most of them can only diagnose the faults that have occurred and can not predict the impending faults. In this way, under normal circumstances, only when the obvious fault - that is, after the vicious damage can be repaired, an increase of maintenance costs, repair time, resulting in the waste of manpower and material resources. For example, the crankshaft journal and bearing, piston and cylinder liner, piston pin and copper sleeve and other fittings, under liquid lubrication conditions, mechanical damage and wear are small. If the above mill