Method for detecting abnormality of fluid filter and fluid filter abnormality detecting system

Patent metadata

Field	Value
Publication number	US-10670434-B2
Application number	US-201615375157-A
Country	US
Kind code	B2
Filing date	Dec 11, 2016
Priority date	Dec 11, 2016
Publication date	Jun 2, 2020
Grant date	Jun 2, 2020

Abstract

A method for detecting an abnormality of a fluid filter includes: detecting a flow rate of a fluid in the fluid filter; detecting a pressure difference in the fluid filter; constructing an operating model of the fluid filter in accordance with a geometry of the fluid filter, a physical characteristic of the fluid, a porosity of the fluid filter, an impurity density, the flow rate and the pressure difference; obtaining an initial impurity accumulative quantity through the operating model; estimating a time dependent impurity accumulative status through a Kalman filter in accordance with the initial impurity accumulative quantity and the pressure difference; obtaining an impurity accumulative quantity in an estimated time in accordance with the time dependent impurity accumulative status, and then comparing the impurity accumulative quantity with a pre-determined value to determine if the fluid filter operates normally.

First claim

What is claimed is:

1. A method for detecting an abnormality of a fluid filter, the method comprising:
detecting a flow rate of a fluid in the fluid filter;
detecting a pressure difference in the fluid filter;
constructing an operating model of the fluid filter in accordance with a geometry of the fluid filter, a physical characteristic of the fluid, a porosity of the fluid filter, an impurity density, the flow rate and the pressure difference through an analyzer;
obtaining an initial impurity accumulative quantity through the operating model constructed by the analyzer;
estimating a time dependent impurity accumulative status through a Kalman filter in accordance with the initial impurity accumulative quantity and the pressure difference;
obtaining an impurity accumulative quantity in an estimated time in accordance with the time dependent impurity accumulative status, and then comparing the impurity accumulative quantity with a pre-determined value to determine if the fluid filter operates normally through a processor;
wherein the operating model of the fluid filter can be represented by the following equation:

m
=

k
p

⁢

A
2

⁢

ρ
P

⁢
Δ
⁢

⁢
P

μ
⁢

⁢
Q

-

k
p

⁢
A
⁢

⁢

ρ
P

⁢

L
b

k
b

-

k
p

⁢
A
⁢

⁢

ρ
P

⁢

L
f

k
f

;

where m is an impurity accumulative quantity, ΔP is a pressure difference, μ is a viscosity coefficient of the fluid, Q is a flow rate, A is a cross-sectional area of the fluid filter, κ b is an empty shell porosity, κ f is a filter cartridge porosity, κ p is an impurity porosity, ρ p is an impurity density, L p is an empty shell thickness, L f is a filter cartridge thickness.

2. The method of claim 1 , wherein the fluid is a fuel oil, an engine oil or an automatic transmission oil.

3. The method of claim 1 , wherein the pressure difference is a pressure difference between a fluid inlet and a fluid outlet of the fluid filter.

4. The method of claim 3 , wherein the pressure difference comprises an empty shell pressure difference, a filter cartridge pressure difference and an impurity pressure difference.

5. The method of claim 1 , wherein when the operation of the fluid filter is determined as abnormal, a warning sound, a warning light or a warning message is generated.

6. The method of claim 1 , wherein the empty shell porosity can be obtained through performing a quadratic regression analysis to a plurality of flow rates of the fluid.

Assignees

• Automotive Res & Testing Ct

Inventors

• Cheng Sheng-Chieh
• Ku Yong-Yuan
• Lin ke-wei
• Chiang Chia-Jui

Classifications

• B01D35/005 Primary

  Filters specially adapted for use in internal-combustion engine lubrication or fuel systems · CPC title

• B01D2201/54

  Computerised or programmable systems · CPC title

• B01D29/603

  by flow measuring · CPC title

• B01D35/143

  Filter condition indicators · CPC title

• G01F1/34 Primary

  by measuring pressure or differential pressure · CPC title