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首页> 外文期刊>Diffusion and Defect Data. Solid State Data, Part B. Solid State Phenomena >Investigations of the vibroacoustic signals sensitivity to mechanical defects not recognised by the OBD system in diesel engines
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Investigations of the vibroacoustic signals sensitivity to mechanical defects not recognised by the OBD system in diesel engines

机译：偶联信号对柴油发动机的OBD系统无法识别的机械缺陷的敏感性

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Operations of the on board diagnostic (OBD) system, is directed to ensuring the correct engine operation in respect of toxicity exhaust gases. Thus, when the parameters analysed by this system are within the permissible values, the system controls them in such a way as to obtain the optimal working conditions from the point of view of the exhaust gases toxicity. The user can be completely unaware of any problem occurring until exceeding of the limiting values causes the MIL lamp to switch on or the system transfers into the failure mode operation or even engine shut-down. The previous investigations indicated explicitly that there is such group of defects (mainly mechanical), at which the OBD system performing self-regulation does not provide the user with the information concerning a defect and, in addition, weakens typical external symptoms such as e.g. power drop. Current works of the authors [1] performed for petrol engines indicated that there is representation between VA signal symptoms and mechanical defects, which at their initial phases are not detected by the OBD system. Thus, the authors decided to verify the sensitivity to VA signals of Diesel Engines.
机译：在轨道诊断（OBD）系统的操作，旨在确保毒性废气的正确发动机操作。因此，当通过该系统分析的参数在允许值内时，系统以这样的方式控制它们，从而从废气毒性的角度获得最佳工作条件。用户可以完全没有意识到发生的任何问题，直到超过限制值会导致MIL灯打开或系统转移到故障模式操作甚至发动机关闭。先前的调查明确表明，有这样的缺陷组（主要是机械），其中表现自我调节的OBD系统不提供有关缺陷的信息，并且此外，削弱典型的外部症状，例如典型的外部症状。电源下降。对汽油发动机进行的作者[1]的当前作品表明，VA信号症状与机械缺陷之间存在表示，其在其初始阶段不会被OBD系统检测到。因此，作者决定验证柴油发动机的VA信号的敏感性。

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