Method and device for judging failure of coarse filter element of filter

Abstract

The invention discloses a method and a device for judging failure of a coarse filter element of a filter, and relates to the technical field of filters. The method for judging the failure of the coarse filter element of the filter comprises the following steps of monitoring coarse pressure differences in N acquisition step lengths in a coarse filter element failure monitoring state, calculating a coarse pressure difference change rate, if the coarse pressure difference change rate being smaller than a coarse pressure difference change rate threshold value, then monitoring pressure after fine filtration in M acquisition step lengths, calculating a pressure change rate after the fine filtration, wherein N and M are positive integers; and if the pressure change rate after fine filtration being smaller than the pressure change rate threshold after the fine filtration, judging that the coarse filter element being invalid. According to the method for judging the failure of the coarse filter element of the filter, a user can be assisted in finding and replacing the failed coarse filter element in time, so that the fine filter element is prevented from being further damaged, the maintenance cost is reduced, and the fault possibility of a fuel system is reduced.

Description

technical field [0001] The invention relates to the technical field of filters, in particular to a method for judging the failure of a primary filter element of a filter and a judging device thereof. Background technique [0002] During the working process of the engine, metal wear debris, dust, carbon deposits and colloidal deposits oxidized at high temperature, water, etc. are continuously mixed into the fuel. Generally, the impurities in the fuel are filtered through the fuel filter to prevent the impurities from entering the fuel injection system, which will eventually lead to failure of the fuel system. [0003] The fuel filter includes a coarse filter element and a fine filter element. The function of the coarse filter element is to separate the large particle impurities and water in the fuel, and the function of the fine filter element is to separate the small particle impurities in the fuel. The coarse filter element and the fine filter element Jointly treat the lar...

AI Technical Summary

Problems solved by technology

When the coarse filter element fails, it will increase the clogging of the fine filter element. In severe cases, the fine filter element may also fail, and impurities enter the fuel injection system, which eventually leads to failure of the entire fuel system.

In the prior art, it is judged whether the filter element is invalid by judging whether the pressure difference between inlet and outlet oil is greater than the preset upper limit of pressure difference. have failed, impurities may have entered the fuel injection system, causing the entire fuel system to fail

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