On-line diesel engine valve state detection method

Abstract

The invention discloses an online diesel engine gas valve state detection method, which includes: monitoring the instantaneous speed, cylinder head vibration, fuel consumption, exhaust temperature, and cooling water temperature of the diesel engine through a sensor; converting the signal collected in step 1 into a standard electrical signal input Data acquisition card: the standard electrical signal is collected and converted from analog to digital by the data acquisition card; through the coupling of the instantaneous speed of the diesel engine and the vibration of the cylinder, the vibration is transformed in the time domain into the angle domain corresponding to the crankshaft angle for order analysis; Measure the order ratio data matrix of the diesel engine under normal conditions and bring it into the formula to turn the fuel consumption x g / kWh, exhaust temperature y K and cooling water temperature z K into margin coefficients; measure the order ratio data matrix B in any state and compare it with ηA , such as B>ηA, it is judged that there is an abnormality in the valve mechanism of the diesel engine. The invention realizes pre-judgment of most failures of the air valve, thereby reminding users to perform maintenance and replacement in advance.

Description

technical field [0001] The invention relates to an online diesel engine gas valve state detection method, which belongs to the technical field of internal combustion engines and marine equipment. Background technique [0002] In fact, the core technology of diesel engine valve detection is feature extraction and feature analysis, which is the main direction of the development of intelligent diesel engines. [0003] A modern large diesel engine is a complex nonlinear system that includes multiple disciplines such as materials science, mechanics, and electronic control. It includes multiple subsystems, and each subsystem interacts. Coordinating with the electronic control unit, each component works in a certain sequence. However, with the wear of the mechanical structure or the inaccuracy or instability of the electronic control unit, each system cannot work in a timely and effective manner, and the systems are coupled to each other. A system If it is not normal, it will affe...

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Problems solved by technology

[0003] A modern large diesel engine is a complex nonlinear system that includes multiple disciplines such as materials science, mechanics, and electronic control. It includes multiple subsystems, and each subsystem interacts. Coordinating with the electronic control unit, each component works in a certain sequence. However, with the wear of the mechanical structure or the inaccuracy or instability of the electronic control unit, each system cannot work in a timely and effective manner, and the systems are coupled to each other. A system The abnormality will affect other systems and show other failure phenomena

The cause of the failure and the failure performance cannot be corresponded one-to-one, and the phenomenon of one cause with multiple effects and one effect with multiple causes appears. Therefore, every time some parts of the diesel engine are completely damaged, they will be discovered or located. At this time, it has already caused relatively large loss

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