CN105065085B - The machine oil quality on-line monitoring system and its method of a kind of multi-sensor information fusion - Google Patents
The machine oil quality on-line monitoring system and its method of a kind of multi-sensor information fusion Download PDFInfo
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Abstract
The invention discloses the machine oil quality on-line monitoring system and its method of a kind of multi-sensor information fusion.The system is made up of test oil passage control valve, metal worn particle detection means, integrated quality detection means, viscosity detecting device, machine oil cooler, data processing module, STM32 measurement and control host computers, human-computer dialogue module etc..Wherein viscosity detecting device is made up of machine oil sampler, thermostatical oil bath cabinet, heater, constant flow pump, liquid level sensor, oil bath temperature sensor, probe temperature sensor, pressure sensor, balanced flow sensor and pressure-control valve.The system is installed on the downstream of lubricating oil way of automobile engine lubricating oil pump, the change of the integrated qualities such as engine oil viscosity, the acid-base value of the content of metal worn particle and machine oil, water content can be monitored on-line, and use multi-sensor information fusion technology comprehensive analysis oil conditions, oil conditions information is shown by display, sends pre-warning signal if necessary.
Description
Technical field
The present invention relates to technical field of vehicle, the machine oil quality of specifically a kind of multi-sensor information fusion is supervised online
Examining system and its method.
Background technology
According to statistics, automobile engine oil is accounted for less than one thousandth in the use cost of automobile, but to the aging effects of automobile
Much larger than 10%, reasonable lubrication can reduce the 25% of vehicle maintenance cost.Machine oil in use for some time, due to extraneous miscellaneous
Matter be mixed into and reason, its quality such as the oxidation of machine oil itself, decomposition and cohesion change, greasy property declines, and causes
Parts wear aggravates, and engine power performance declines, and causes vehicle that catastrophe failure occurs when serious.Therefore, to machine oil
The monitoring of quality is very necessary, can so determine the rational replacing construction of machine oil, reduce caused by machine oil is rotten therefore
Barrier or due to machine oil is less than lifetime and the wasting of resources caused by changing.
Current most domestic user still continues to use the traditional mode of " observation is changed oil " or " changing oil on schedule " to automobile oil, i.e.,
Observation and subjective judgement or determine the moment of changing oil according to lubricating oil service life by rule of thumb.In addition, it is exactly the oil sampled offline
Liquid method for monitoring and analyzing, i.e., mode and sampling interval time carry out the collection of machine oil sample as defined in standard, then will collection
Machine oil sample be sent to specialty detection department, it is analyzed by department professional.However, offline sampling analysis needs
Using the precision instrument of costliness, and there is the problem of significant limitation, whether ageing and sampling fluid is representative.
So, do not pinpoint the problems in time really not only, while also consumes large quantities of man power and materials.
In recent years, the on-line monitoring technique of automobile engine oil causes the concern of people, publication No. more and more：
CN203374340U, title：A kind of Chinese patent of engine motor oil warning device, is supervised respectively using viscosity and temperature sensor
The change of the viscosity and temperature of machine oil is surveyed, but the content of metal worn particle and the integrated quality change of machine oil, monitoring knot can not be detected
Fruit lacks accuracy.Notification number：CN2554632Y, title：The Chinese patent of intelligent oil quality monitoring instrument, by different sensings
Device monitors the viscosity, temperature and dielectric constant of machine oil respectively, and the integrated quality of machine oil is obtained by information fusion technology, but due to
It uses high frequency oscillation measuring circuit to be also easy to produce high-frequency magnetic field, very big so as to be caused to the measurement accuracy of capacitance sensor
Influence.Publication No.：CN10283085A, title：The Chinese patent of the device for detecting performance of engine motor oil, is passed by electric capacity
The parameters such as viscosity, moisture, acid number and the metallic content of sensor and infrared sensor monitoring machine oil, finally by display device
Feed back to user.When the above-mentioned device being related to monitors to engine oil viscosity, all do not meet 100 as defined in national standard GBT8028-2010
DEG C test temperature requirement, measuring principle existing defects, the measurement result of engine oil viscosity has very big error.
The content of the invention
The invention provides a kind of simple in construction, can under standard environment (normal temperature, normal pressure) it is online in real time
The machine oil monitored in the change of the integrated qualities such as the viscosity, metallic content and acid-base value, moisture with machine oil is supervised online
Examining system, and multi-sensor information fusion technology is used, comprehensive analysis oil conditions, judge oil pollution degree, and by aobvious
Show that device shows oil conditions information, send the machine oil quality on-line monitoring system and method for prompting and pre-warning signal if necessary.
Technical solution of the present invention is described with reference to the drawings as follows：
A kind of machine oil quality on-line monitoring system of multi-sensor information fusion, the system are installed on automotive engine lubrication
The downstream of oil circuit lubricating oil pump 1, including it is test oil passage control valve 2, metal worn particle detection means 3, integrated quality detection means 5, viscous
Spend detection means, machine oil cooler 17, data processing module 18, measurement and control host computer 19 and human-computer dialogue module；It is wherein described
Oil passage control valve 2 is tested to fill with metal worn particle detection means 3, integrated quality detection means 5, viscosity measurements successively by oil circuit
Put, machine oil cooler 17 connects；Described metal worn particle detection means 3, integrated quality detection means 5, viscosity detecting device
In liquid level sensor 8, oil bath temperature sensor 9, probe temperature sensor 10, pressure sensor 14, balanced flow sensor
15 electrically connect with data processing module 18；Data processing module 18 electrically connects with the input port of measurement and control host computer 19；Measurement and control host computer
19 output end electrically connects with human-computer dialogue module and test oil passage control valve 2；Set outside described metal worn particle detection means 3
There are the first screening arrangement 4, integrated quality detection means 5 to be externally provided with secondary shielding device 6；Described human-computer dialogue module includes pre-
Alarm device 20 and display 21.
Described test oil passage control valve 2 is arranged on the branch road in parallel with working connection 22, and one end is passed through machine oil downstream
Sampler 17；The described downstream of machine oil cooler 17 is passed through oil sump 23.
Described metal worn particle detection means 3 uses Double-coil type inductance sensor, and its structure is by induction coil L1, reference
Coil L2, resistance R1 and resistance R2 are formed；Wherein described induction coil L1 connects with resistance R1, reference coil L2 and resistance R2
Series connection, driving source both ends are followed by by the parallel connection of above-mentioned two lines road；Oil circuit to be measured, resistance R1 and resistance are full of in induction coil L1
R2 is the counter-jib of electric bridge.
Described integrated quality detection means 5 uses dielectric constant sensor, and its structure is respectively r by an interior outer radius
Formed with R pipe 25 with being close to the two halves arc-shaped electrode 26 of the outer wall of pipe 25, the material of pipe 25 is perfluoroethylene third
Alkene, the material of electrode 26 is metallic copper.
The first described screening arrangement 4 and secondary shielding device 6 are using the metal with high conductivity and low magnetic permeability
Aluminium shields shell.
Described viscosity detecting device also includes machine oil sampler 12, thermostatical oil bath cabinet 11, heater 7, constant flow pump 13
And pressure-control valve 16；Wherein described heater 7, oil bath temperature sensor 9 and machine oil sampler 12 are arranged on thermostatical oil
In bath cabinet 11, described liquid level sensor 8 and probe temperature sensor 10 are arranged in machine oil sampler 12；Described constant current
The upstream of pump 13 is passed through machine oil sampler 12；Described constant flow pump 13 according to the direction that machine oil transmits by oil circuit successively with pressure
Force snesor 14, balanced flow sensor 15 are connected with pressure-control valve 16；Described liquid level sensor 8, oil bath temperature sensing
Device 9, probe temperature sensor 10, pressure sensor 14, balanced flow sensor 15 pass through data processing module 18 and observing and controlling master
The input port of machine 19 is connected；Described constant flow pump 13, heater 7 and pressure-control valve 16 passes through data processing module 18 and observing and controlling
The output port of main frame 19 is connected.
A kind of monitoring method of the machine oil quality on-line monitoring system of multi-sensor information fusion, is comprised the following steps that：
Step 1: the detection of metal worn particle content, integrated quality and sampling：First, there is no machine oil in machine oil sampler 12,
Liquid level sensor 8 detects that the liquid level in machine oil sampler 12 is less than minimum, and liquid level sensor 8 passes through this information
Measurement and control host computer 19 is delivered to after the processing of data processing module 18, the control of measurement and control host computer 19 is tested at the turn-on data of oil passage control valve 2
Module 18 is managed, lubricating oil pump 1 conveys the machine oil in oil sump 23 to the downstream of branch road；When machine oil flows through metal worn particle detection means
When 3, Double-coil type inductance sensor detects the metal worn particle content for flowing through induction coil, and the signal detected is passed through into data
Measurement and control host computer 19 is delivered to after the processing of processing module 18, the content of metallic is calculated in measurement and control host computer 19；Machine oil then flows
Through integrated quality detection means 5, at this moment, tubular capacitor sensor by detection flow through the dielectric constant values of 26 machine oil of electrode come
Judge the integrated quality of machine oil, and measurement and control host computer 19 passed to after the signal detected is handled by data processing module 18,
The integrated quality of machine oil is calculated in measurement and control host computer 19；Machine oil flows through metal worn particle detection means 3 and integrated quality detection means 5
Afterwards, it is transported to along oil circuit in machine oil sampler 12, when liquid level sensor 8 detects the liquid level in machine oil sampler 12
When highly reaching maximum, the control test oil passage control valve 2 of measurement and control host computer 19 is closed, and sampling process terminates；
Step 2: build normal temperature：After sampling process terminates, heater 7 is started working, and oil bath temperature sensor 9 is real
When monitor oil bath temperature, the real-time monitoring machine oil sample oil temperature of probe temperature sensor 10, when oil bath temperature not yet reaches 150 DEG C,
And machine oil sample oil temperature has been when having reached 100 DEG C, probe temperature sensor 10 by the machine oil sample oil temperature signal collected via
Data processing module 18 is transported to measurement and control host computer 19, and measurement and control host computer 19 is recognized after this temperature signal reaches threshold value, control heating
Device 7 is stopped；When oil bath temperature reaches 150 DEG C, and machine oil sample oil temperature is not up to 100 DEG C, oil bath temperature sensor 9 will be adopted
The oil bath temperature signal collected is transported to measurement and control host computer 19 via data processing module 18, and measurement and control host computer 19 recognizes this temperature letter
After number reaching threshold value, control heater 7 is stopped, and now, 150 DEG C of oil bath is by not yet reaching 100 DEG C of machine oil sample oil
Heated, until probe temperature sensor 10 detects that machine oil sample oil temperature reaches 100 DEG C；
Step 3: simulation operating pressure：When probe temperature sensor 10 detects that machine oil sample oil temperature reaches 100 DEG C,
Measurement and control host computer 19 controls constant flow pump 13 and pressure-control valve 16 to start working, and constant flow pump 13 is by machine oil sampler 12
100 DEG C of machine oil sample oil downstream transport, due to the effect of constant flow pump 13 and pressure-control valve 16, the machine oil quilt in pipeline therebetween
At normal atmospheric pressure, pressure sensor 14 monitors pipeline inner engine oil pressure, and Real-time Feedback is to measurement and control host computer 19, by oil circuit for control
Stress control under the pressure of simulated engine machine oil real work i.e. at normal atmospheric pressure；
Step 4: engine oil viscosity detects：When machine oil flows through balanced flow sensor 15, balanced flow sensor 15 detects
Oil flow rate signal, and this signal is delivered to measurement and control host computer 19, measurement and control host computer 19 after data processing module 18 is handled
According to relational model formula：
V (x)=- 0.002x3+1.0769x2- 203.22x+14210 calculates the kinematic viscosity value of machine oil,
Wherein, v is that x is oil flow rate in the kinematic viscosity value with machine oil；
And according to calculation formula：
Wherein viIn the kinematic viscosity value with machine oil, to be tried to achieve by formula V (x)；V0For the kinematic viscosity value of fresh oil, it is
Known quantity；η is the kinematic viscosity rate of change of machine oil, and carries out com-parison and analysis with existing standard, and it is qualified to determine whether；
Step 5: cooling for reflux：Machine oil flows through machine oil cooler 17, and oil sump 23 is flowed back to after being cooled down；
Step 6: information fusion：Measurement and control host computer 19 is by engine oil viscosity information, metallic content under the standard state of storage
Information, integrated quality information carry out data fusion by BP network algorithms, using one-level BP blending algorithms, from multi information angle pair
Oil conditions are judged and classified, and compared with examination criteria, draw the current state of machine oil；
Step 7: display, early warning：It is defeated by display 21 after the state current to machine oil of measurement and control host computer 19 judges
Go out judged result, judged result has：Normally, light contamination, seriously pollute and scrap, when judged result seriously to pollute or scrap
When, prior-warning device 20 will send alarm of changing oil.
Beneficial effects of the present invention are：(1) present invention is measured using multisensor to many index of machine oil, is passed through
Information fusion technology carries out overall merit to machine oil quality；(2) present invention detects to metallic detection means and integrated quality
Device installs screening arrangement additional, masks the interference of magnetic field and electric field to sensor, reduces measurement error；(3) present invention can be built
Go out to change oil specified in standard 100 DEG C of temperature environment, and engine oil viscosity is measured in this environment, machine oil is improved and glues
The accuracy of detection of degree.STM32 measurement and control host computers are passed to after the information monitored is handled by data processing module, finally
User is fed back to by display and prior-warning device.
Brief description of the drawings
Fig. 1 is the structural representation of the machine oil quality on-line monitoring system of multi-sensor information fusion of the present invention；
Fig. 2 is the machine oil quality on-line monitoring system dielectric constant sensor cross section of multi-sensor information fusion of the present invention
Schematic diagram；
Fig. 3 is that the machine oil quality on-line monitoring system metallic detection means of multi-sensor information fusion of the present invention detects
Basic circuit diagram；
Fig. 4 is the multi-sensor information fusion knot of the machine oil quality on-line monitoring system of multi-sensor information fusion of the present invention
Composition；
Fig. 5 is the workflow of the monitoring method of the machine oil quality on-line monitoring system of multi-sensor information fusion of the present invention
Figure.
In figure, 1, lubricating oil pump；2nd, oil passage control valve is tested；3rd, metal worn particle detection means；4th, the first screening arrangement；5th, it is comprehensive
Close quality inspection device；6th, secondary shielding device；7th, heater；8th, liquid level sensor；9th, oil bath temperature sensor；10th, sample
Temperature sensor；11st, thermostatical oil bath cabinet；12nd, machine oil sampler；13rd, constant flow pump；14th, pressure sensor；15th, balanced flow
Sensor；16th, pressure-control valve；17th, machine oil cooler；18th, data processing module；19th, measurement and control host computer；20th, prior-warning device；
21st, display；22nd, working connection；23rd, oil sump；24th, collecting filter；25th, pipe；26th, electrode.
Embodiment
Refering to Fig. 1, a kind of machine oil quality on-line monitoring system of multi-sensor information fusion, the system is installed on automobile hair
The downstream of motivation lubricant passage way lubricating oil pump 1；Including test oil passage control valve 2, metal worn particle detection means 3, integrated quality detection
Device 5, viscosity detecting device, machine oil cooler 17, data processing module 18, measurement and control host computer 19 and human-computer dialogue module；Its
Described in test oil passage control valve 2 by oil circuit successively with metal worn particle detection means 3, integrated quality detection means 5, viscosity
Detection means, machine oil cooler 17 connect；Described metal worn particle detection means 3, integrated quality detection means 5, viscosity inspection
Liquid level sensor 8, oil bath temperature sensor 9, probe temperature sensor 10, pressure sensor 14, the balanced flow surveyed in device
Sensor 15 electrically connects with data processing module 18；Data processing module 18 electrically connects with the input port of measurement and control host computer 19；Survey
The output end for controlling main frame 19 electrically connects with human-computer dialogue module and test oil passage control valve 2；Described metal worn particle detection means 3
It is provided with the first screening arrangement 4 outside, integrated quality detection means 5 is externally provided with secondary shielding device 6；Described human-computer dialogue module
Including prior-warning device 20 and display 21.
Measurement and control host computer 19 selects model STM32.
Described test oil passage control valve 2 is arranged on the branch road in parallel with working connection 22, and one end is passed through machine oil downstream
Sampler 17, the break-make of this branch road is controlled by test oil passage control valve 2；The described downstream of machine oil cooler 17 is passed through oil
Drain pan 23.
Refering to Fig. 3, described metal worn particle detection means 3 is used for detecting metallic content in machine oil, using twin coil
Formula inductance sensor, its structure are made up of induction coil L1, reference coil L2, resistance R1 and resistance R2；Wherein described sensing
Coil L1 is connected with resistance R1, and reference coil L2 connects with resistance R2, and the parallel connection of above-mentioned two lines road is followed by into driving source both ends；
Oil circuit to be measured, resistance R1 and the counter-jib that resistance R2 is electric bridge are full of in induction coil L1.
Its Cleaning Principle is：Due to the effect of electromagnetic induction, metal worn particle passes through meeting during the magnetic field of inductance type spiral winding
Cause the change of coil magnetic conductivity, so that its inductance value changes, and then causes the induced signal of induction coil to change, become
Change amplitude is relevant with the cumulative volume of metal worn particle, thus the content of the metal worn particle by spiral winding is determined, by data
Processing module 18 is delivered to measurement and control host computer 19.When oil circuit to be measured flows through without metallic, output electromotive force e is zero；Therefore, when
When having the metallic to flow through in oil circuit to be measured, induction coil L1 inductance will change, and cause to export electromotive force e and become
Change.
Refering to Fig. 1, provided with the secondary shielding device for shielding external signal, its material uses high conductivity and low magnetic conductance
The metallic aluminium of rate, to reach the shielding purpose to high frequency magnetic field and low frequency electric field.
Refering to Fig. 2, described integrated quality detection means 5 is used for detecting the integrated quality of machine oil, such as：Acid-base value, water
Point content, iron content etc., using dielectric constant sensor, its structure by an interior outer radius be respectively r and R pipe 25 with it is tight
The two halves arc-shaped electrode 26 for pasting the outer wall of pipe 25 forms, and two halves circular arc pole plate inner surface forms capacitor, machine oil during use
Flowed through by pipe inner chamber.This sensor construction has advantages below：First, columnar structure is easily straight with oil line pipe
Connect in succession, installation is simple, is just monitored on-line with realizing；Second, pipe separates machine oil and pole plate, machine oil will not be with metal polar plate
Contact, reduces the corrosiveness to pole plate；Finally, due to the weak attached power of parent of machine oil and nonmetallic tube wall, in certain main oil gallery
Under interior oil pressure, flow velocity effect, the oil film and deposit that are deposited in pipe are easy to be rinsed, it is therefore prevented that traditional dielectric constant senses
Deposit is attached to the drawbacks of influence measurement sensitivity on pole plate in device.
The material of pipe 25 is perfluoroethylene-propylene (FEP), and perfluoroethylene-propylene has following properties：It is 1. easy to process
Property：Melt-processable, it is easy to make；2. resistant of high or low temperature：Influence change to temperature is little, and temperature range scope is wide, long-term use of
Temperature is -195 DEG C~200 DEG C；It is 3. corrosion-resistant：Perfluoroethylene-propylene is hardly corroded by any chemical reagents；4. hypotonicity：
Gas and liquid are extremely low by the permeability of perfluoroethylene-propylene；5. high-lubricity：With coefficient of friction minimum in plastics
(0.04)；6. surface non-stick：It on the surface, is a kind of minimum solid material of surface energy that known solid material, which can not all adhere to,
Material；The above characteristic of polytetrafluoroethylene (PTFE), fully meet requirement of the dielectric constant sensor to tube wall.
The material of electrode 26 is metallic copper, because metallic copper has, good processing technology, cost are low, temperature coefficient is low,
Good toughness, it is wear-resistant the advantages that.
The outside of integrated quality detection means 5 is provided with the secondary shielding device for being used for shielding external signal, and its material is using high
The metallic aluminium of electrical conductivity and low magnetic permeability, to reach the shielding purpose to high frequency magnetic field and low frequency electric field.
Its Cleaning Principle is：When machine oil goes bad, hydrocarbon partial is oxidized, and its molecular polarity changes.Such as：
After having water entrance, OH is produced-And H+Ion；Organic acid is penetrated into, RCOO can be produced-And H+Ion；Into metallic, just have
Free electron produces.When the machine oil containing polar molecule flows through dielectric constant sensor, the capacitance of dielectric constant sensor
Increase εrTimes.By the variable quantity for measuring electric capacity, it is possible to reflect wherein dielectric permittivity εrSituation of change.Cause
This is when the dielectric using machine oil as dielectric constant sensor, by measuring εrChange, the deterioration journey of machine oil can be reflected
Degree.
Refering to Fig. 1, described viscosity detecting device includes machine oil sampler 12, thermostatical oil bath cabinet 11, heater 7, perseverance
Flow pump 13, liquid level sensor 8, oil bath temperature sensor 9, probe temperature sensor 10, pressure sensor 14, balanced flow sensing
Device 15 and pressure-control valve 16；Wherein described heater 7, oil bath temperature sensor 9 and machine oil sampler 12 are arranged on constant temperature
In oil bath case 11, described liquid level sensor 8 and probe temperature sensor 10 are arranged in machine oil sampler 12；Described perseverance
The upstream of stream pump 13 is passed through machine oil sampler 12；Described constant flow pump 13 according to the direction that machine oil transmits by oil circuit successively with
Pressure sensor 14, balanced flow sensor 15 are connected with pressure-control valve 16；Described liquid level sensor 8, oil bath temperature pass
Sensor 9, probe temperature sensor 10, pressure sensor 14, balanced flow sensor 15 pass through data processing module 18 and observing and controlling
The input port of main frame 19 is connected；Described constant flow pump 13, heater 7 and pressure-control valve 16 is by data processing module 18 with surveying
The control output port of main frame 19 is connected.Wherein, thermostatical oil bath cabinet 11 is sought by the machine oil heating in machine oil sampler 12 to 100 DEG C
Produce the environment of normal temperature；Subsequent constant flow pump 13 is operated, and pressure-control valve 16 is started working, in constant flow pump 13 and Stress control
In the presence of valve 16, the machine oil environment (simulated engine machine oil actual working pressure environment) of a standard atmospheric pressure is built,
Pressure sensor 14 between constant flow pump 13, pressure-control valve 16 monitors engine oil pressure in real time, and it is big to keep it in standard
Under air pressure.
Machine oil cooler is arranged on pressure-control valve downstream along oil feed line, for the machine oil of sampling suitably to be cooled down
After flow back to oil sump.
Refering to Fig. 4, a kind of monitoring method of the machine oil quality on-line monitoring system of multi-sensor information fusion, specific steps
It is as follows：
Step 1: the detection of metal worn particle content, integrated quality and sampling：First, there is no machine oil in machine oil sampler 12,
Liquid level sensor 8 detects that the liquid level in machine oil sampler is less than minimum, and this information is passed through into data processing mould
Measurement and control host computer 19 is delivered to after the processing of block 18, and the control test oil passage control valve 2 of measurement and control host computer 19 opens (the now not work of constant flow pump 13
Make), lubricating oil pump 1 conveys the machine oil in oil sump 23 by the downstream of the backward branch road of preliminary filtering of collecting filter 24, works as machine oil
When flowing through metal worn particle detection means 3, Double-coil type inductance sensor passes through inductance quantitative change between induction coil and reference coil
The difference of change flows through the metal worn particle content of induction coil to detect, and by the signal detected by data processing module 18 at
Measurement and control host computer 19 is delivered to after reason, the content of metallic is calculated in measurement and control host computer 19；Machine oil then flows through integrated quality inspection
Device 5 is surveyed, at this moment, tubular capacitor sensor flows through the dielectric constant values of machine oil between pole plate to judge the synthesis of machine oil by detection
Quality (acid-base value, moisture, iron content etc.), and passed to after the signal detected is handled by data processing module 18
The integrated quality of machine oil is calculated in measurement and control host computer 19, measurement and control host computer 19.Machine oil flows through metal worn particle detection means 3 and comprehensive product
After quality detecting device 5, it is transported to along oil circuit in machine oil sampler 12, when liquid level sensor 8 detects machine oil sampling dress
When putting the liquid level in 12 and reaching maximum, the control test oil passage control valve 2 of measurement and control host computer 19 is closed, and sampling process terminates.
Step 2: build normal temperature：After sampling process terminates, heater 7 is started working.In thermostatical oil bath cabinet 11
Oil bath temperature sensor 9 monitor oil bath temperature in real time, the probe temperature sensor 10 in machine oil sampler 12 is real-time
Monitoring machine oil sample oil temperature, it now will appear from two kinds of possibilities.The first possibility：Oil bath temperature not yet reaches 150 DEG C, and machine
Oil sample oil temperature has reached 100 DEG C, and at this moment, probe temperature sensor 10 is by the machine oil sample oil temperature signal collected via number
Measurement and control host computer 19 is transported to according to processing module 18, and measurement and control host computer 19 is recognized after this temperature signal reaches threshold value, controls heater 7
It is stopped；Second of possibility：When oil bath temperature reaches 150 DEG C, and machine oil sample oil temperature is up to 100 DEG C, to prevent from continuing
Heating cause dimethicone vaporize or flash burn, now oil bath temperature sensor 9 by the oil bath temperature signal collected via number
Measurement and control host computer 19 is transported to according to processing module 18, and measurement and control host computer 19 is recognized after this temperature signal reaches threshold value, controls heater 7
It is stopped, now, 150 DEG C of oil bath will heat to the machine oil sample oil for not yet reaching 100 DEG C, until probe temperature senses
Device 10 detects that machine oil sample oil temperature reaches 100 DEG C.
Step 3: simulation operating pressure：When probe temperature sensor 10 detects that machine oil sample oil temperature reaches 100 DEG C,
STM32 measurement and control host computers 19 control constant flow pump 13 and pressure-control valve 16 to start working, and constant flow pump 13 is by machine oil sampler 12
In 100 DEG C of machine oil sample oil downstream transport.Due to the effect of constant flow pump 13 and pressure-control valve 16, the machine in pipeline therebetween
Oil is controlled in normal atmosphere pressure, and pressure sensor 14 monitors pipeline inner engine oil pressure, and Real-time Feedback is to measurement and control host computer 19, and one
Denier oil pressure is unstable, and measurement and control host computer 19 can be made by controlling constant flow pump 13 and pressure-control valve 16 to adjust the oil pressure in pipeline
Machine oil is kept at normal atmospheric pressure.
Step 4: engine oil viscosity detects：When machine oil flows through balanced flow sensor 15, balanced flow sensor 15 detects
Oil flow rate signal, and this signal is delivered to measurement and control host computer 19, measurement and control host computer 19 after data processing module 18 is handled
According to relational model formula：
V (x)=- 0.002x3+1.0769x2- 203.22x+14210 calculates the kinematic viscosity value of machine oil,
Wherein, v is that x is oil flow rate in the kinematic viscosity value with machine oil；
And according to calculation formula：
Further obtain the kinematic viscosity rate of change of machine oil.Wherein viIn the kinematic viscosity value with machine oil, to pass through formula V (x)
Try to achieve；V0It is known quantity for the kinematic viscosity value of fresh oil；η is the kinematic viscosity rate of change of machine oil, and is divided with existing standard
Analysis is compared, and it is qualified to determine whether；
Step 5: cooling for reflux：Machine oil flows through machine oil cooler 17, and oil sump 23 is flowed back to after being cooled down；
Step 6: information fusion：Because artificial intelligence neural networks can fully approach arbitrarily complicated non-linear relation, hold
Mistake is good, and measurement and control host computer 19 is by engine oil viscosity information, metallic content information, integrated quality information under the standard state of storage
Data fusion is carried out by BP network algorithms, because the system is to detect engine oil viscosity under normal temperature (100 DEG C), not deposited
The temperature-compensating to engine oil viscosity and gamma correction the problem of, therefore one-level BP blending algorithms are used, from more letters
Breath angle is judged and classified to oil conditions, and compared with examination criteria, draws the current state of machine oil.
Refering to Fig. 4, the core concept of BP algorithm is：By output error with some form by hidden layer to input layer successively
Anti-pass, error distribution is given to all units of each layer, to correct the weights of each unit, that is, a kind of " positive biography of signal
Broadcast ", " backpropagation of error " process, the forward-propagating process of signal is：Input sample->Input layer->Each hidden layer->
Output layer；The back-propagation process of error is：Error represents in each layer with some form, each layer unit weights is corrected, until net
Untill the error of network output is reduced to acceptable degree.Before system use, it is necessary to using MATLAB neutral net instruments
Case is trained to sample data；
Step 7: display, early warning：After the state current to machine oil of measurement and control host computer 19 judges, exported by display
Judged result (normal, light contamination, seriously pollutes and scrapped), when judged result is seriously pollutes or scrapped, prior-warning device
Alarm of changing oil will be sent.
The present invention can under standard environment (normal temperature, normal pressure) on-line real time monitoring with the viscosity of machine oil,
The machine oil on-line monitoring system of the integrated quality such as metallic content and acid-base value, moisture change, and use sense more
Device information fusion technology, comprehensive analysis oil conditions, judge oil pollution degree, and show that oil conditions are believed by display
Breath, prompting and pre-warning signal are sent if necessary.
Claims (6)
1. the machine oil quality on-line monitoring system of a kind of multi-sensor information fusion, it is characterised in that the system is installed on automobile
The downstream of engine oil gallery lubricating oil pump (1), including test oil passage control valve (2), metal worn particle detection means (3), synthesis
Quality inspection device (5), viscosity detecting device, machine oil cooler (17), data processing module (18), measurement and control host computer (19) and
Human-computer dialogue module；Wherein described test oil passage control valve (2) by oil circuit successively with metal worn particle detection means (3), comprehensive
Close quality inspection device (5), viscosity detecting device, machine oil cooler (17) connection；Described metal worn particle detection means
(3), the liquid level sensor (8) in integrated quality detection means (5), viscosity detecting device, oil bath temperature sensor (9), sampling
Temperature sensor (10), pressure sensor (14), balanced flow sensor (15) electrically connect with data processing module (18)；Data
Processing module (18) electrically connects with the input port of measurement and control host computer (19)；The output end of measurement and control host computer (19) and human-computer dialogue module
With test oil passage control valve (2) electrical connection；The first screening arrangement (4), comprehensive is provided with outside described metal worn particle detection means (3)
Close quality inspection device (5) and be externally provided with secondary shielding device (6)；Described human-computer dialogue module includes prior-warning device (20) and shown
Show device (21)；Described test oil passage control valve (2) is arranged on the branch road in parallel with working connection (22), and one end is passed through downstream
Machine oil sampler (17)；Described machine oil cooler (17) downstream is passed through oil sump (23).
2. a kind of machine oil quality on-line monitoring system of multi-sensor information fusion according to claim 1, its feature exist
In described metal worn particle detection means (3) uses Double-coil type inductance sensor, and its structure is by induction coil L1, reference line
L2, resistance R1 and resistance R2 is enclosed to form；Wherein described induction coil L1 connects with resistance R1, and reference coil L2 and resistance R2 goes here and there
Connection, driving source both ends are followed by by the parallel connection of above-mentioned two lines road；Oil circuit to be measured, resistance R1 and resistance R2 are full of in induction coil L1
For the counter-jib of electric bridge.
3. a kind of machine oil quality on-line monitoring system of multi-sensor information fusion according to claim 1, its feature exist
In described integrated quality detection means (5) uses dielectric constant sensor, and its structure is respectively r and R by an interior outer radius
Pipe (25) be close to pipe (25) outer wall two halves arc-shaped electrode (26) form, the material of pipe (25) is poly- perfluor
Second propylene, the material of electrode (26) is metallic copper.
4. a kind of machine oil quality on-line monitoring system of multi-sensor information fusion according to claim 1, its feature exist
In described the first screening arrangement (4) and secondary shielding device (6) are using metallic aluminium shielding shell.
5. a kind of machine oil quality on-line monitoring system of multi-sensor information fusion according to claim 1, its feature exist
In described viscosity detecting device also includes machine oil sampler (12), thermostatical oil bath cabinet (11), heater (7), constant flow pump
And pressure-control valve (16) (13)；Wherein described heater (7), oil bath temperature sensor (9) and machine oil sampler (12) are set
Put in thermostatical oil bath cabinet (11), described liquid level sensor (8) and probe temperature sensor (10) is arranged on machine oil sampling dress
Put in (12)；The upstream of described constant flow pump (13) is passed through machine oil sampler (12)；Described constant flow pump (13) is according to machine oil
The direction of transmission by oil circuit successively with pressure sensor (14), balanced flow sensor (15) and pressure-control valve (16) phase
Even；It is described liquid level sensor (8), oil bath temperature sensor (9), probe temperature sensor (10), pressure sensor (14), flat
Weighing apparatus flow sensor (15) is connected by data processing module (18) with measurement and control host computer (19) input port；Described constant flow pump
(13), heater (7) and pressure-control valve (16) are connected by data processing module (18) with measurement and control host computer (19) output port.
A kind of 6. machine oil quality on-line monitoring system of multi-sensor information fusion according to any one of claim 1-5
The monitoring method of system, it is characterised in that comprise the following steps that：
Step 1: the detection of metal worn particle content, integrated quality and sampling：First, there is no machine oil, liquid in machine oil sampler (12)
The liquid level that level sensor (8) detects in machine oil sampler (12) is less than minimum, and liquid level sensor (8) is by this information
Measurement and control host computer (19), measurement and control host computer (19) control test oil passage control valve are delivered to after being handled by data processing module (18)
(2) turn-on data processing module (18), lubricating oil pump (1) convey the machine oil in oil sump (23) to the downstream of branch road；Work as machine oil
When flowing through metal worn particle detection means (3), Double-coil type inductance sensor detects the metal worn particle content for flowing through induction coil, and
Measurement and control host computer (19) is delivered to after the signal detected is handled by data processing module (18), measurement and control host computer (19) calculates
To the content of metallic；Machine oil then flows through integrated quality detection means (5), and at this moment, tubular capacitor sensor passes through detection
Flow through the dielectric constant values of machine oil between electrode (26) to judge the integrated quality of machine oil, and by the signal detected by data at
Measurement and control host computer (19) is passed to after reason module (18) processing, the integrated quality of machine oil is calculated in measurement and control host computer (19)；Machine oil stream
After metal worn particle detection means (3) and integrated quality detection means (5), machine oil sampler (12) is transported to along oil circuit
In, when liquid level sensor (8) detect machine oil sampler (when the liquid level in 12 reaches maximum, measurement and control host computer (19)
Control test oil passage control valve (2) is closed, and sampling process terminates；
Step 2: build normal temperature：After sampling process terminates, heater (7) is started working, and oil bath temperature sensor (9) is real
When monitor oil bath temperature, probe temperature sensor (10) monitoring machine oil sample oil temperature in real time, when oil bath temperature not yet reaches 150
DEG C, and when machine oil sample oil temperature has reached 100 DEG C, machine oil sample oil temperature signal that probe temperature sensor (10) will collect
Measurement and control host computer (19) is transported to via data processing module (18), measurement and control host computer (19) recognizes this temperature signal and reaches threshold value
Afterwards, heater (7) is controlled to be stopped；When oil bath temperature reaches 150 DEG C, and machine oil sample oil temperature is not up to 100 DEG C, oil bath temperature
The oil bath temperature signal collected is transported to measurement and control host computer (19), observing and controlling by degree sensor (9) via data processing module (18)
Main frame (19) is recognized after this temperature signal reaches threshold value, and control heater (7) is stopped, and now, 150 DEG C of oil bath will be right
Not yet reach 100 DEG C of machine oil sample oil to be heated, until probe temperature sensor (10) detects that machine oil sample oil temperature reaches
100℃；
Step 3: simulation operating pressure：When probe temperature sensor (10) detects that machine oil sample oil temperature reaches 100 DEG C, survey
Control main frame (19) control constant flow pump (13) and pressure-control valve (16) is started working, constant flow pump (13) is by machine oil sampler
(12) inner 100 DEG C of machine oil sample oil downstream transport, due to the effect of constant flow pump (13) and pressure-control valve (16), is managed therebetween
Machine oil in road is controlled in normal atmosphere pressure, and pressure sensor (14) monitoring pipeline inner engine oil pressure, Real-time Feedback is to survey
Main frame (19) is controlled, the i.e. normal atmosphere pressure under the pressure of simulated engine machine oil real work by the Stress control of oil circuit；
Step 4: engine oil viscosity detects：When machine oil flows through balanced flow sensor (15), balanced flow sensor (15) detection
Oil flow rate signal, and this signal is delivered to measurement and control host computer (19), measurement and control host computer after data processing module (18) processing
(19) according to relational model formula：
V (x)=- 0.002x3+1.0769x2- 203.22x+14210 calculates the kinematic viscosity value of machine oil,
Wherein, v is that x is oil flow rate in the kinematic viscosity value with machine oil；
And according to calculation formula：
<mrow>
<mi>&eta;</mi>
<mo>=</mo>
<mfrac>
<mrow>
<msub>
<mi>v</mi>
<mi>i</mi>
</msub>
<mo>-</mo>
<msub>
<mi>v</mi>
<mn>0</mn>
</msub>
</mrow>
<msub>
<mi>v</mi>
<mn>0</mn>
</msub>
</mfrac>
<mo>&times;</mo>
<mn>100</mn>
<mi>%</mi>
</mrow>
Wherein viIn the kinematic viscosity value with machine oil, to be tried to achieve by formula V (x)；V0It is known for the kinematic viscosity value of fresh oil
Amount；η is the kinematic viscosity rate of change of machine oil, and carries out com-parison and analysis with existing standard, and it is qualified to determine whether；
Step 5: cooling for reflux：Machine oil flows through machine oil cooler (17), and oil sump (23) is flowed back to after being cooled down；
Step 6: information fusion：Measurement and control host computer (19) believes engine oil viscosity information, metallic content under the standard state of storage
Breath, integrated quality information carry out data fusion by BP network algorithms, using one-level BP blending algorithms, from multi information angle to oil
Product state is judged and classified, and compared with examination criteria, draws the current state of machine oil；
Step 7: display, early warning：It is defeated by display (21) after measurement and control host computer (19) state current to machine oil judges
Go out judged result, judged result has：Normally, light contamination, seriously pollute and scrap, when judged result seriously to pollute or scrap
When, prior-warning device (20) will send alarm of changing oil.
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| DE112018001248T5 (en) * | 2017-03-08 | 2019-12-12 | Cummins Filtration Ip, Inc. | LUBRICATION MAINTENANCE SYNCHRONIZATION |
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| CN108204847B (en) * | 2017-12-27 | 2020-04-07 | 中国航发四川燃气涡轮研究院 | Aero-engine lubricating oil liquid level and oil product integrated measurement sensor and method |
| CN108333084B (en) * | 2018-04-27 | 2023-07-07 | 北京信息科技大学 | Oil abrasive particle online detection test bed and detection method |
| CN108613899B (en) * | 2018-06-15 | 2023-12-22 | 昆明理工大学 | Strain type self-adaptive oil viscosity measurement device and method |
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| CN110206530B (en) * | 2019-04-26 | 2022-11-29 | 中国石油集团西部钻探工程有限公司 | Data processing and metering method and system in oil testing operation |
| CN110554172A (en) * | 2019-06-06 | 2019-12-10 | 上海传一电子科技有限公司 | Portable lubricating oil state check out test set |
| CN110206612A (en) * | 2019-07-03 | 2019-09-06 | 天津大学 | The online attemperation apparatus of machine oil and its method |
| CN110389168B (en) * | 2019-07-23 | 2022-11-22 | 电子科技大学 | Engine metal scrap detection method based on magnetic detection principle and inductance method |
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