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首页> 外文会议>Mechatronic systems, mechanics and materials >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：对柴油发动机OBD系统无法识别的机械缺陷的振动声信号敏感性的研究

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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：车载诊断（OBD）系统的运行旨在确保有毒废气方面的发动机正确运行。因此，当由该系统分析的参数在允许值之内时，该系统以从废气毒性的观点获得最佳工作条件的方式控制它们。用户可能完全不知道会发生任何问题，直到超出限制值导致MIL灯点亮或系统进入故障模式运行甚至关闭发动机为止。先前的研究明确指出存在这样的一组缺陷（主要是机械缺陷），在该组缺陷处，进行自我调节的OBD系统不会为用户提供有关缺陷的信息，此外还会削弱典型的外部症状，例如：功率下降。作者[1]的当前工作是为汽油发动机进行的，表明VA信号症状和机械缺陷之间存在表示关系，OBD系统无法在其初始阶段对其进行检测。因此，作者决定验证柴油发动机对VA信号的敏感性。

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