Method and device of improving online monitoring accuracy of engine oil metal abrasive particles

Abstract

The invention discloses a method and a device of improving online monitoring accuracy of engine oil metal abrasive particles, designing a detection device capable of improving the online monitoring accuracy of the metal abrasive particles in engine oil and integrating an absolute electromagnetic detection technology, a differential motion electromagnetic detection technology and an array electromagnetic detection technology. According to the method and the device disclosed by the invention, online dynamic detection is carried out on the metal abrasive particles in the engine oil by adopting an integrated combination detection mode of absolute electromagnetic detection, differential motion electromagnetic detection and array electromagnetic detection, so that antijamming capability, monitoring accuracy and monitoring sensitivity of the device are improved, quality of the metal abrasive particles which pass through an oil return pipeline of an engine can be effectively measured in real time, and material quality is simultaneously separated by utilizing the characteristics that magnetic conductivity and electric conductivity of metal abrasive particles of copper abrasive particles, aluminum abrasive particles, iron abrasive particles and the like are different, so that the abrasion condition of the engine is judged, and alarm is sent out when abrasion loss reaches a preset upper limit threshold value, thereby timely eliminating safety hidden dangers due to abrasion of the engine and ensuring normal work of the engine.

Description

technical field [0001] The invention relates to a non-destructive detection method and device, in particular to a method and device for improving the online monitoring accuracy of engine oil metal abrasive particles. Background technique [0002] An engine is a machine that can convert other forms of energy into another energy. It is a mechanical device that generates power. Engines are widely used in various transportation vehicles, such as airplanes, ships, trains, automobiles, etc. The engine belongs to the "heart" part of the transportation vehicle. The working condition of the engine will directly affect the driving and safety of the transportation vehicle. Therefore, only by monitoring and diagnosing the wear state of the engine can the normal operation of the engine be guaranteed. In the prior art, the oil detection method is usually used to detect the wear state of the engine. The oil detection method is a method for monitoring the wear state of the engine without d...

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Problems solved by technology

In the above two methods, no matter which one it is, it is necessary to extract lubricating oil from the engine, and then analyze the metal abrasive particles in the extracted lubricating oil in the laboratory, which belongs to the off-line detection of engine oil , the detection cycle of this off-line detection method is too long, and the potential safety hazards of the engine cannot be found in time

The detection speed of the online electromagnetic oil monitoring device is fast, and it is easy to realize dynamic monitoring. At present, there are a small number of online electromagnetic detection devices and methods in foreign countries, but the device method is relatively simple, and most of the designed electromagnetic detection sensors are single detection coils. The working environment is relatively harsh, so there is normal wear and tear, that is, a relatively uniform group of tiny abrasive particles is produced, and the absolute electromagnetic detection coil can detect the concentration change of the continuously passing tiny metal abrasive particle group, which is not available in the existing method. Reflect; the differential electromagnetic detection coil has a higher detection sensitivity for larger metal abrasive particles (for example, greater than 100 μm) than the absolute type, and at the same time has a stronger anti-interference ability, because the electromagnetic detection coil is very sensitive to the induction of electromagnetic fields, vibration and external electromagnetic noise will The interference signal generated is sent to the electromagnetic detector. The advantage of the differential electromagnetic detection coil group is that the secondary reflected magnetic field signal generated by the measured metal abrasive particles is very different from the interference signal. The differential electromagnetic detection coil group receives and transmits it to the electromagnetic detector. The secondary reflected magnetic field signal generated by the measured metal abrasive particles of the detector is a similar 8-shaped detection signal pattern in the impedance plane display mode of the electromagnetic detector, that is, a spliced ​​pattern of two signals with the same intensity and opposite phase. The above-mentioned symmetrical 8-shaped signal pattern will not appear in the interference signal, and the electromagnetic detector can identify and distinguish it by setting the alarm gate. It will be too large, leading to misjudgment and affecting the normal operation of the engine. Due to the above and many other reasons, the online electromagnetic oil monitoring device has not been really popularized and applied so far.

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