Method and device for fault diagnosis of diesel engine

A technology of fault diagnosis and diesel engine, applied in the direction of internal combustion engine testing, etc., can solve problems such as low accuracy of fault type diagnosis and untimely fault judgment, and achieve the effects of easy access, reduced fault incidence, and improved reliability

Active Publication Date: 2015-10-07
WEICHAI POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the above technical problems, the embodiment of the present invention provides a diesel engine fault diagnosis method and device, which solves the problem of untimely fault judgment by analyzing the angle domain, and further solves the problem of low accuracy of fault type diagnosis question

Method used

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  • Method and device for fault diagnosis of diesel engine
  • Method and device for fault diagnosis of diesel engine
  • Method and device for fault diagnosis of diesel engine

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Embodiment 1

[0043] see figure 1 , which is a method flow chart of a diesel engine fault diagnosis method of the present invention, the method may include the following steps:

[0044] S101: When the diesel engine is running in various fault modes, the electronic control unit ECU monitors the running state of the diesel engine in advance and collects the speed pulse signal of the crankshaft gear plate of the diesel engine under the running state; obtains the angular displacement signal through the speed pulse signal; the diagonal displacement The order analysis of the signal is carried out to obtain the frequency domain characteristic quantity of the torsional vibration frequency domain amplitude signal corresponding to various failure modes under the monitored operating state, and the monitored operating state and the frequency domain characteristic quantity under the operating state are combined with each The corresponding relationship between the failure modes is saved.

[0045] Throug...

Embodiment 2

[0057] see figure 2 , which is another method flowchart of a diesel engine fault diagnosis method of the present invention, when the current working state of the obtained diesel engine is any fault mode, the method also includes the following steps:

[0058] For S201 to S206, please refer to S101 to S106 in Embodiment 1.

[0059] S207: The ECU collects parameters of the diesel engine's water temperature, engine oil pressure, engine oil temperature, intake pressure, and intake temperature.

[0060] S208: The ECU combines the collected parameters with the failure mode of the diesel engine to determine the subtype of the failure mode.

[0061] For example, if Figure 5 Shown is the change diagram of torsional vibration amplitude of the diesel engine transmission shaft when the injector wears 5%. by right Figure 5 According to the analysis of the torsional vibration frequency domain amplitude diagram of the shafting of the diesel engine, the power of the diesel engine increa...

Embodiment 3

[0064] see Image 6 , which is a system structure diagram of a diesel engine fault diagnosis system of the present invention, including a self-learning unit 601, a detection unit 602, a first acquisition unit 603, a conversion unit 604, an analysis unit 605 and a matching unit 606:

[0065] The self-learning unit 601 is used for when the diesel engine is running in various failure modes, the electronic control unit ECU pre-collects the speed pulse signals of the crankshaft gear plate of the diesel engine under various failure modes; through the speed pulse signals, the angular displacement signal is obtained ; The order analysis of the angular displacement signal is carried out to obtain the frequency domain characteristic quantity of the torsional vibration frequency domain amplitude signal corresponding to various failure modes, combined with the operating conditions of the diesel engine in various failure modes, and the correspondence of various failure modes The correspond...

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Abstract

The embodiment of the invention discloses a method and device for diagnosing failure of a diesel engine. The method comprises the steps of: firstly, aiming at self-learning phases under different failure modes, monitoring an operation state of the diesel engine by an ECU (Electronic Control Unit), acquiring a rotating speed pulse signal of a crank shaft fluted disc of the diesel engine under the operation state by the ECU, obtaining an angular displacement signal by the ECU through the rotating speed pulse signal, carrying out order analysis on the angular displacement signal by the ECU to obtain a frequency domain characteristic quantity of a crank shaft torsional vibration frequency domain amplitude signal under the monitored operation state, and matching the monitored operation state and the frequency domain characteristic quantity under the operation state with a prestored correspondence by the ECU to obtain a current working state of the diesel engine. It can be perceived that the diesel engine is monitored in real time by using angle domain signal analysis on a shafting line of the diesel engine, so that the failure type of the diesel engine can be accurately judged, the failure rate of the diesel engine is effectively lowered, and the reliability of the diesel engine is improved.

Description

technical field [0001] The invention relates to the field of fault diagnosis, in particular to a diesel engine fault diagnosis method and device. Background technique [0002] With the continuous improvement of domestic and international diesel engine emission regulations, electronically controlled diesel engines have become the main models of current and later development. Diesel engines using crank-connecting rod mechanisms have complex structures and discontinuous work processes of cylinders. The inertial force and cylinder gas The force has a strong impact and broadband excitation effect; in addition, the diesel engine includes many systems and components, which all have a variety of forces, and the resulting vibration of the diesel engine is multi-vibration source, broadband and complex of. [0003] Conventional fault diagnosis methods usually use sensors to collect various temperature and air pressure parameters of the diesel engine, and perform fault diagnosis based ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M15/05
Inventor 韩峰李云强黄国龙文志永田新伟
Owner WEICHAI POWER CO LTD
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