EP4058769A1 - Vorrichtung und verfahren zur leckageerkennung bei einem hydraulikzylinder - Google Patents
Vorrichtung und verfahren zur leckageerkennung bei einem hydraulikzylinderInfo
- Publication number
- EP4058769A1 EP4058769A1 EP20824503.5A EP20824503A EP4058769A1 EP 4058769 A1 EP4058769 A1 EP 4058769A1 EP 20824503 A EP20824503 A EP 20824503A EP 4058769 A1 EP4058769 A1 EP 4058769A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pressure
- hydraulic cylinder
- pressure sensor
- norm
- leak
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 238000000034 method Methods 0.000 title claims description 23
- 238000011156 evaluation Methods 0.000 claims abstract description 33
- 230000002950 deficient Effects 0.000 claims description 15
- 238000010801 machine learning Methods 0.000 claims description 14
- 238000005259 measurement Methods 0.000 claims description 14
- 238000012549 training Methods 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 9
- 238000013528 artificial neural network Methods 0.000 claims description 7
- 238000006073 displacement reaction Methods 0.000 claims description 5
- 239000012530 fluid Substances 0.000 description 9
- 230000008901 benefit Effects 0.000 description 5
- 238000011161 development Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000013017 mechanical damping Methods 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000007619 statistical method Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/32—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators
- G01M3/3236—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators by monitoring the interior space of the containers
- G01M3/3272—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators by monitoring the interior space of the containers for verifying the internal pressure of closed containers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
- F15B19/005—Fault detection or monitoring
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
- F15B19/007—Simulation or modelling
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1447—Pistons; Piston to piston rod assemblies
- F15B15/1452—Piston sealings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
- F15B20/005—Leakage; Spillage; Hose burst
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/63—Electronic controllers
- F15B2211/6303—Electronic controllers using input signals
- F15B2211/6306—Electronic controllers using input signals representing a pressure
- F15B2211/6313—Electronic controllers using input signals representing a pressure the pressure being a load pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/80—Other types of control related to particular problems or conditions
- F15B2211/857—Monitoring of fluid pressure systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/80—Other types of control related to particular problems or conditions
- F15B2211/87—Detection of failures
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/025—Details with respect to the testing of engines or engine parts
Definitions
- the present invention relates to a device and a method for leak detection in a hydraulic cylinder, in particular a differential cylinder.
- Hydraulic seals especially piston seals, are subject to one
- the device for detecting leaks in a hydraulic cylinder comprises a first pressure sensor for detecting a pressure value in a first pressure chamber of a hydraulic cylinder, a second pressure sensor for detecting a pressure value in a second pressure chamber of the hydraulic cylinder, and an evaluation unit for continuously detecting the pressure values from the first Pressure sensor and the second pressure sensor, wherein the evaluation unit is designed to detect a leakage deviating from the standard, preferably internal leakage, of the hydraulic cylinder based on the detected pressure values of the first pressure sensor and the second pressure sensor.
- the hydraulic cylinder can be a double-acting hydraulic cylinder which has a pressure sensor provided for this purpose for each pressure chamber.
- the evaluation unit is now able to analyze the pressure values obtained from the two pressure sensors connected to the two pressure chambers and to evaluate them with regard to an abnormally high leakage. Both at least one pressure value from the first pressure sensor and at least one pressure value from the second pressure sensor are included in the evaluation.
- the evaluation unit uses a neural network or is a neural network for evaluating the detected pressure values of the first pressure sensor and the second pressure sensor.
- a neural network given appropriate training data, develops its own criteria or classification parameters on the basis of which it recognizes whether a hydraulic cylinder has a leak or not.
- specifications on the basis of which the neural network should make decisions.
- the evaluation unit is designed to use machine learning to generate combinations of pressure values of the to classify the first pressure sensor and the second pressure sensor as lying within the norm or outside the norm.
- the recorded pressure values can be evaluated while the hydraulic cylinder is in operation, so that the hydraulic cylinder is continuously monitored during operation.
- the evaluation unit can be designed to use machine, unsupervised learning (also called: unsupervised learning) to form the classification parameters for recognizing a leak in the hydraulic cylinder that deviates from the norm.
- unsupervised learning also called: unsupervised learning
- the grouping of data is in the foreground.
- the basis for this are usually statistical methods so that dependencies in the supplied data can be recognized.
- specific values of pressure value combinations of the two pressure sensors, or of sequences thereof are linked with normal operation of the hydraulic cylinder or with a state deviating from the norm.
- An anomaly detection is also possible, which by suitable formation of clusters (classification parameters) determines which data sets correspond to the norm and which are more conspicuous.
- the evaluation is preferably also based on rules and relationships created by the machine. It is thus possible that a leaky piston in the hydraulic cylinder can be detected at an early stage.
- the evaluation unit is designed to perform a combination to subject the pressure values of the two pressure sensors to a plausibility check based on the principle of monitored learning.
- the invention also relates to a method for leak detection in a hydraulic cylinder, in which method pressure values of a first pressure sensor, which measures the pressure in a first chamber of a hydraulic cylinder, and pressure values of a second pressure sensor, which measures the pressure in a second chamber of the hydraulic cylinder, continuously are recorded, and a leakage deviating from the norm, preferably internal leakage, is concluded on the basis of the recorded pressure values.
- An internal leak in a hydraulic cylinder is a flow of hydraulic fluid across the piston from one pressure chamber to the other pressure chamber. Such a flow is prevented by an intact piston seal.
- the deviation from the norm occurs through the classification of pressure values of the two chambers measured at the same time or a series of pressure values of the two chambers measured at the same time.
- the data measured by the pressure sensors at a point in time form a data record or part of a data record, which is checked for abnormalities by the evaluation unit.
- the data record can, for example, also be linked to a displacement state of the piston, so that a
- Movement deviation of the piston is detected with inconspicuous pressure values.
- the data records generated can also represent data records from a certain time sequence, so that the evaluation does not have to be limited to a specific point in time and circumstances that change over time also become visible.
- machine learning is used to assess whether there is a deviation from the norm, in particular unsupervised machine learning, preferably by taking measurement data from the first pressure sensor and the second pressure sensor from a defective hydraulic cylinder as well as measurement data from the first Pressure sensor and the second pressure sensor can be used by a non-defective hydraulic cylinder for a training sequence of machine unsupervised learning.
- the peculiarity of unsupervised learning is that the expected output is not known at the beginning of the learning process.
- the data sets obtained from unsupervised learning are therefore used as labeled data sets and used as training data for subsequent monitored learning. This results in a model that can be tested with the labeled data.
- the evaluation of whether there is a leak that deviates from the standard is carried out during the operation of the hydraulic cylinder. It can further be provided that the evaluation of whether there is a leakage deviating from the norm is carried out by classifying pressure values measured at the same time in the two chambers or a chronological sequence of pressure values measured at the same time in the two chambers. It is also possible to use not only the pressure values of the two pressure sensors but also the displacement state of the hydraulic cylinder to evaluate whether there is a leak that deviates from the standard.
- a pressure value of the first pressure sensor, a pressure value of the second pressure sensor and the displacement state of the hydraulic cylinder can form a data record for a common point in time, and the evaluation of whether there is a leak that deviates from the norm on the basis of this data record or a chronological sequence of several of these data records respectively.
- the first pressure sensor and / or the second pressure sensor is / are arranged directly in the hydraulic cylinder or is / are integrated there.
- This arrangement position enables the significantly higher damping pressures to be recorded, which is an advantage because it is as high as possible
- the first pressure sensor and / or the second pressure sensor is connected to the Cylinder connections of the hydraulic cylinder or even on an upstream control block is / are in order to infer the pressure conditions inside the hydraulic cylinder.
- this arrangement position too, a conclusion about a leak in the piston seal is possible by detecting the pressure by means of the first pressure sensor and / or the second pressure sensor.
- Such an arrangement position is appropriate, for example, when the hydraulic cylinder has no mechanical damping.
- the hydraulic cylinder has mechanical damping.
- the external unit is an engine control device, is implemented in such an engine control device or is based on an engine control device.
- the advantage of integrating the evaluation unit in an engine control device is that such an engine control device is already present in a construction machine that carries a hydraulic cylinder provided with the leakage detection, so that additional hardware is no longer required.
- FIG. 1 a schematic representation of the device according to the invention on a hydraulic cylinder
- FIG. 2 a schematic representation of the device according to the invention on a hydraulic cylinder
- 1 shows a schematic representation of a differential cylinder which is divided into a first pressure chamber 3 and a second pressure chamber 4 by a piston.
- the piston has a seal 6 so that the two Pressure chambers are fluidically separated from one another. If the piston is moved, this takes place via the supply and corresponding discharge of a hydraulic fluid via the two fluid connections 7. However, if the seal 6 is defective or has already been worn beyond the permissible extent, there is a leakage 5, so that hydraulic fluid from a under high Pressurized chamber 3 flows to a chamber 4 under less pressure.
- a pressure sensor 2 is provided on each of the two pressure chambers 3, 4 in order to transmit pressure values to a computing unit 1. An evaluation then takes place in this arithmetic unit, which can detect a leak between the two chambers across the piston on the basis of the determined pressure values of the two pressure chambers.
- the piston seal is typically worn, so that there is a fluid passage between the two pressure chambers that are actually separated by the piston.
- the pressure states which clearly identify the leakage state of the hydraulic cylinder, are classified in the computing unit by means of machine learning. During the operation of the hydraulic cylinder, the pressure signals from the two chambers are evaluated and conclusions are drawn as to the operating state of the piston seal.
- S1 and S2 indicate that both a completely intact hydraulic cylinder as a reference and a defective hydraulic cylinder with a worn piston seal are required in order to generate corresponding measurement data for the two hydraulic cylinders in S3.
- S3 the pressure of a differential cylinder is recorded on the rod and piston side. The detection can take place over a certain travel path with different pressure loads on the cylinder and also access values from the displacement measuring system of the hydraulic cylinder.
- S4 form reference measurement data
- the measurement data of the defective hydraulic cylinder form measurement data of the defective cylinder (S5).
- the measurement data of the intact and the defective hydraulic cylinder are combined into a common data set in order to be used as the basis for unsupervised machine learning.
- the underlying cluster method is a density-based method that makes use of algorithms for data density and distance functions.
- the labeled data (S8) are then obtained therefrom, which are used in S9 as training data for monitored machine learning (S10).
- the neural network trained in this way forms a model (S11) on the basis thereof, which can be tested with test data (S12) obtained from the labeled data (S8) so that a tested model (S13) is obtained as a result.
- This tested model (S13) is used by the computing unit 1, so that, given the corresponding pressure values of the two pressure sensors, one can reliably infer a defect in the piston seal.
- the pressure values generated are simply continuously passed on to the arithmetic unit 1, based on the model tested can detect a leak that deviates from the standard, which is caused by a defective piston seal.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Examining Or Testing Airtightness (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102019133491.8A DE102019133491A1 (de) | 2019-12-09 | 2019-12-09 | Vorrichtung und Verfahren zur Leckageerkennung bei einem Hydraulikzylinder |
| PCT/EP2020/085359 WO2021116219A1 (de) | 2019-12-09 | 2020-12-09 | Vorrichtung und verfahren zur leckageerkennung bei einem hydraulikzylinder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4058769A1 true EP4058769A1 (de) | 2022-09-21 |
Family
ID=73835576
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP20824503.5A Withdrawn EP4058769A1 (de) | 2019-12-09 | 2020-12-09 | Vorrichtung und verfahren zur leckageerkennung bei einem hydraulikzylinder |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20230008702A1 (de) |
| EP (1) | EP4058769A1 (de) |
| DE (1) | DE102019133491A1 (de) |
| WO (1) | WO2021116219A1 (de) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102021208743A1 (de) | 2021-08-11 | 2023-02-16 | Herbert Hänchen GmbH | Verfahren zur Detektion einer Leckage von Hydraulikmedium |
| CN115450990B (zh) * | 2022-11-14 | 2023-02-03 | 山东天力润滑油有限公司 | 用于对液压油泄漏进行检测的方法和设备 |
| CN116183117B (zh) * | 2023-04-28 | 2023-08-04 | 山东福阳液压科技有限公司 | 一种基于位移的液压缸密封性测试装置 |
| CN116818207B (zh) * | 2023-08-30 | 2023-12-08 | 济宁鲁威液压科技股份有限公司 | 一种液压元件的气密性性能检测装置及方法 |
| CN116989955B (zh) * | 2023-09-26 | 2024-01-09 | 山东宇飞传动技术有限公司 | 一种基于流体检测的液压缸密封性检测装置 |
| CN117386694B (zh) * | 2023-10-30 | 2025-12-12 | 合肥工业大学 | 一种液压缸磨损演化与泄露监测的方法及其数字孪生系统 |
| CN118959394B (zh) * | 2024-08-16 | 2025-09-30 | 中交第二航务工程局有限公司 | 一种打桩船桩架主油缸密封状态检测系统及检测方法 |
Family Cites Families (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1109001B1 (de) * | 1999-12-15 | 2005-03-16 | Kistler Holding AG | Verfahren zur Bestimmung des oberen Totpunktes einer Brennkraftmaschine mit neuronalem Lernen |
| US6968826B2 (en) * | 2002-11-08 | 2005-11-29 | Ford Global Technologies, Llc | Control system parameter monitor |
| AU2003221352B2 (en) * | 2003-03-12 | 2006-08-17 | Toyota Jidosha Kabushiki Kaisha | Suspension system for motor vehicle |
| AU2003250921A1 (en) * | 2003-07-09 | 2005-01-28 | Peter Wolters Surface Technologies Gmbh And Co. Kg | Holder for flat workpieces, in particular semiconductor wafers for mechanochemical polishing |
| US7043975B2 (en) * | 2003-07-28 | 2006-05-16 | Caterpillar Inc | Hydraulic system health indicator |
| US20070045067A1 (en) * | 2005-08-26 | 2007-03-01 | Husco International, Inc. | Hydraulic circuit with a pilot operated check valve for an active vehicle suspension system |
| KR101377802B1 (ko) * | 2012-04-25 | 2014-03-25 | 현대제철 주식회사 | 유압 설비의 성능 변화 모니터링 장치 |
| DE102013018281B4 (de) * | 2013-10-31 | 2019-05-02 | Zeppelin Systems Gmbh | Volumetrische Dosiereinheit |
| US20170211600A1 (en) * | 2014-04-02 | 2017-07-27 | Sikorsky Aircraft Corporation | System and method for heatlh monitoring of servo-hydraulic actuators |
| US10337172B2 (en) * | 2015-01-27 | 2019-07-02 | Volvo Construction Equipment Ab | Hydraulic control system |
| JP2017025982A (ja) * | 2015-07-21 | 2017-02-02 | オークマ株式会社 | サーボ駆動油圧ユニット |
| US10352814B2 (en) * | 2015-11-10 | 2019-07-16 | Phyn Llc | Water leak detection using pressure sensing |
| CN105386953B (zh) * | 2015-12-25 | 2017-04-19 | 上海交通大学 | 数字配流恒流量径向柱塞泵 |
| EP3196623A1 (de) * | 2016-01-25 | 2017-07-26 | Primetals Technologies Germany GmbH | Einfache leckagebestimmung bei einer hydraulikzylindereinheit |
| US20180187498A1 (en) * | 2017-01-03 | 2018-07-05 | General Electric Company | Systems and methods for early well kick detection |
| JP6821614B2 (ja) * | 2018-02-16 | 2021-01-27 | 日本電信電話株式会社 | モデル学習装置、モデル学習方法、プログラム |
| US11466429B2 (en) * | 2020-01-23 | 2022-10-11 | Stanley Black & Decker, Inc. | Prime mover mountable hydraulic tool and related monitoring systems and methods |
-
2019
- 2019-12-09 DE DE102019133491.8A patent/DE102019133491A1/de not_active Withdrawn
-
2020
- 2020-12-09 WO PCT/EP2020/085359 patent/WO2021116219A1/de not_active Ceased
- 2020-12-09 EP EP20824503.5A patent/EP4058769A1/de not_active Withdrawn
- 2020-12-09 US US17/783,243 patent/US20230008702A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| WO2021116219A1 (de) | 2021-06-17 |
| DE102019133491A1 (de) | 2021-06-10 |
| US20230008702A1 (en) | 2023-01-12 |
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