Online diesel engine air valve state detection method

Abstract

The invention discloses an online diesel engine air valve state detection method. The method comprises the following steps: monitoring the instantaneous rotating speed, cylinder cover vibration, diesel consumption, discharge temperature and cooling water temperature of a diesel engine through a sensor; converting signals collected in the first step into standard electric signals to be input in a data acquisition card; carrying out acquisition and analog-to-digital conversion on the standard electric signals by the data acquisition card; by coupling the instantaneous speed of the diesel engineand the vibration of a cylinder, converting the vibration in a time domain into an angle domain corresponding to a crank angle for order analysis; measuring an order ratio data matrix shown in the specification of the diesel engine under normal conditions; introducing the order ratio data matrix in a formula to change the diesel consumption x g/kWh, discharge temperature y K and cooling water temperature z K into margin coefficients; and measuring an order ratio data matrix B in arbitrary conditions, and comparing B with eta A, wherein, when B is greater than eta A, an air valve of the dieselengine is abnormal. According to the method, most faults of the air valve are judged in advance, so that a user is reminded of overhauling and replacing the air valve 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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