原子吸收光谱法在发动机异响检测中的应用

现有的人工经验听诊法和仪器辅助诊断法都难以快速诊断发动机异响故障原因，为此创新性地提出了利用原子吸收光谱法对汽车发动机异响故障进行检测。对行驶里程分别为2 000～70 000 km，取样间隔约为2 000 km，35批次的奥迪A6发动机润滑油中的主要金属Fe，Al，Cu，Cr，Pb含量利用原子吸收光谱法进行检测，建立同一车型发动机不同行驶里程数润滑油主要金属含量的数据库。研究结果表明主要金属含量随着汽车行驶里程数在某一范围内波动。在实际工程应用中，通过测定有异响发动机的润滑油中主要金属含量，将其与含量变化趋势图进行比对，在不解体状态下帮助检测维修人员确定发动机异响的类型和部位，降低汽车维修成本，提高了发动机异响故障诊断的准确性。

Application of Atomic Absorption Spectrometry in the Engine Knock Detection

Because existing human experience diagnosis method and apparatus for auxiliary diagnosis method are difficult to diagnose quickly engine knock. Atomic absorption spectrometry was used to detect the automobile engine knock in an innovative way. After having determined Fe, Al, Cu, Cr and Pb content in the 35 groups of Audi A6 engine oil whose travel course is 2 000~70 000 kilometers and whose sampling interval is 2 000 kilometers by atomic absorption spectrometry，the database of primary metal content in the same automobile engine at different mileage was established. The research shows that the main metal content fluctuates within a certain range. In practical engineering applications，after the determination of engine oil main metal content and comparison with its database value，it can not only help to diagnose the type and location of engine knock without the disintegration and reduce vehicle maintenance costs and improve the accuracy of engine knock fault diagnosis.