CN2554632Y - Intelligence oil quality monitoring instrument - Google Patents
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- CN2554632Y CN2554632Y CN 02261839 CN02261839U CN2554632Y CN 2554632 Y CN2554632 Y CN 2554632Y CN 02261839 CN02261839 CN 02261839 CN 02261839 U CN02261839 U CN 02261839U CN 2554632 Y CN2554632 Y CN 2554632Y
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Abstract
The utility model discloses an oil product quality state monitor, which is used for the evaluation of the lubricating oil or the hydraulic oil. The monitor comprises parts of a viscosity detector, a temperature sensor, a capacitance-grate type capacitor, a sensor circuit, an 89 C52 single-chip microcomputer, a communication interface circuit, a man-machine dialogue module (comprising a keyboard input module, a display module and an alarm circuit), etc., and can not only monitor the oil viscosity, the dielectric constant and the changing of the oil temperature, but also obtain the state of the oil product by infusing the viscosity, the temperature and the dielectric constant which are detected and by utilizing the multi-sensor information fusion technology, thereby greatly improving the accuracy of the oil product quality detection. The utility model can transfer the monitoring data into an upper computer through a serial port for further analysis.
Description
One, affiliated field
The utility model relates to a kind of instrument and equipment, specifically a kind of intelligent oil quality monitor that is used for lubricating oil or detection of hydraulic oil oil quality and evaluation.
Two, background technology
Oil product in use for some time, owing to the intrusion of foreign impurity and the reasons such as oxidation, cohesion, hydrolysis and decomposition of oil itself, make deterioration of oil product and oil dope consumption, cause the change of oily physicochemical property, with the prolongation of service time, the performance of oil is tending towards deterioration.As continuing to use this rotten oil can cause that sediment sharply increases, power performance descends, component wear aggravation, so that system's generation catastrophic failure.
Therefore, the quality monitoring of oil is necessary, evaluates the degradation of oil by certain Monitoring Data, reasonably changes, and does like this, in serviceable life that on the one hand can proper extension oil, saves the cost of changing oil; On the other hand, can reduce the fault of the system that causes because of deterioration of oil product.
The state of lubricating oil assessed mainly contain dual mode: two kinds of online and off-lines.At present, in engineering is used, use the offline inspection technology that performance, the state of oil product are monitored mostly, the oil sample of collection in worksite is delivered to the test of carrying out physicochemical property after the monitoring center, instrument commonly used has kinematic viscosity analyzer, naphthaometer, mechanical impurity analyzer, moisture teller etc. to analyze instrument, these instruments have the advantage of measuring accuracy height, test method conforms standard, but it is bulky to have the following disadvantages (1), only be adapted at carrying out off-line analysis in the laboratory environment, be not suitable for on-the-spot test; (2) process need from the spot sampling to the lab analysis takes a long time, and can not satisfy the requirement of real-time; (3) instrument cost height, the technology that maintenance and operation requires is higher, can not use widely at the scene.
The lubricating oil product monitoring method of online use mainly contains flash spotting, constant current component analysis method and capacitance method etc.Flash spotting utilizes the shading characteristic of pollutant directly to monitor the solid particle in the fluid, representative is the automatic abrasive particle counter of hyperchannel that U.S. HIAC/ROYCO company releases, and flash spotting only is fit to analyze the more shallow oil lower with dustiness of color.Chinese patent [2,454,774 1 kinds of turbine oil dustinesss of authorization notification number detector, authorization date: October 17 calendar year 2001], introduced a kind of turbine oil dustiness detector, this detector is based on photovoltaic principals, pass through via the gap between the parallel transparent thin board at detected turbine oil, light beam penetrates oil reservoir between the thin plate through small holes, lay a photo-electric conversion element at the opposite side of thin plate, when light beam is radiated on the photo-electric conversion element through oil reservoir, can produce certain electric signal, signal level is directly proportional with grain size, after the Microcomputer Detecting classification, can judge the pollution level of oil
Constant current component analysis method utilization oil flows through filter membrane in constant rate, the dustiness of fluid is determined in the variation that pressure reduction by monitoring filter membrane two ends reaches the pressure reduction at filter membrane two ends in the time of a certain predetermined value or the monitoring schedule time, as the portable contamination monitor of DCA of U.S. DIGNETICS company release etc.Capacitance method is extrapolated the pollution level of fluid according to changes in capacitance.For example people such as Zhao Fang uses the capacitance-grid type capacitive transducer that the quality of oil product is estimated, designed appearance grid shape capacitive transducer is relatively more responsive to the moisture in the lubricating oil, and relatively poor to the susceptibility of metal worn particle.
The novel oil quality determining instrument of Chinese patent 92226404[, authorization date: on July 3rd, 1993], introduced a kind of oil quality determining instrument, this detector is locked in oscillator on one on the standard frequency all the time with an adaptive phase-locked loop feedback circuit, and the feedback signal of its phase-locked loop just can directly reflect the variation of tested oil quality.
Above these instruments of introducing only can be monitored the single index of oil product, can carry out monitoring equipment that multiple parametric synthesis analyzes seldom, the method that these utilize single information source information that oil quality is monitored, shortage is to collaborative utilization, the overall treatment of multi-source information, thus aspect reliability, accuracy and practicality defectives of various degrees all.
Three, summary of the invention
Defective or deficiency at above-mentioned prior art existence, the utility model utilizes neural network characteristics such as " fully approaching any complex nonlinear concern; zmodem; fraction cloth parallel processing ", set up neural network oil quality status monitoring model, developed a kind of intelligent oil quality monitor, not high enough in order to overcome traditional fault recognition rate, rely on engineering technical personnel's problems such as analysis experience, have certain practical significance improving fluid operation maintenance and technology management level.
At the construction field (site),, judge, can cause false-alarm and fail to report with the information of single-sensor because the sensor that badly often makes of environment is damaged.Therefore, comprehensive (integrated and fusion) by the multiple sensors data, to obtain than each single-sensor more information, make resource obtain to share, and can when a certain sensor breaks down, utilize other sensor and redundant signals processor to compensate, realize message complementary sense between the sensor, even certain sensor failure, system still can obtain correct result, has improved system survivability greatly.
For satisfying the needs of accuracy, reliability, must organically combine sensor technology, microelectric technique and computer technology etc., develop a cover intellectual monitoring instrument, this device should have following characteristics:
A. measuring process robotization
Have automatically patrol and examine, automatic diagnosis, automatic warning function.That is to say in observation process, can monitor and show and detect the viscosity number of oil product 40 ℃ under, the dielectric constant values of oil and oil temperature, and data such as demonstration failure code.
B. realize that multiparameter detects and information fusion
On the basis of carrying out the multiparameter detection, correlation properties according to each road information, realize the multi-sensor information fusion of detection system, thereby improve reliability and the fault-tolerance that detects, information such as the viscosity that records, temperature, specific inductive capacity are merged the state that draws oil product.
C. intelligent data is handled
When follow-on test, cross sticking and environment temperature is crossed operating mode such as low and can compensate and adjust, have the ability of the temperature variation of conforming, can not report and fail to report phenomenon by mistake because of above-mentioned reason generation to the oil body that occurs at any time.
D. communication function
The on-line monitoring instrument should have the ability of carrying out communication with PC, and parameter value or the failure message measured are in time sent into host computer, for remote monitoring and the diagnosis that realizes the oil liquid monitoring system provides the basis.
To achieve these goals, the technical scheme that the utility model is taked is: a kind of intelligent oil quality monitor comprises the circuit that is provided with in an Instrument shell and the housing; Circuit part comprises: with a single-chip microcomputer 1 is the microprocessor of core, it is characterized in that single-chip microcomputer 1 is connected with oscillatory circuit 5, electric capacity freq converting circuit 6, temperature sensor 7, supervisory circuit 8, keyboard load module 9, serial led driver 10, communication module 12 and storer 13; Oscillatory circuit 5 is connected with to be measured with viscosity sensor 2 with reference to using quartz crystal 3, and electric capacity freq converting circuit 6 is connected with capacitive transducer 4, and serial led driver 10 is connected with light-emitting diode display 11.
Some other characteristics of the present utility model are, described measurement be a QCM (Quartz Crystal Microbalance) with viscosity sensor 2, and version employing single face touches the liquid type; Described oscillatory circuit 5 adopts MAX913, and its output is the Transistor-Transistor Logic level signal, is convenient to the collection of single-chip microcomputer.
The model of described communication module 12 is MAX232; The model of described storer 13 is 24C04.
The model of described temperature sensor 8 is DS1820; The model of described serial led driver is Max7219.
The utility model not only can be monitored the variation of oil viscosity, specific inductive capacity and oil temperature, also utilize the information fusion technology of multisensor, the viscosity, temperature, the specific inductive capacity that measure are merged the state that draws oil product, judge the pollution level of oil, improved the accuracy that oil quality detects greatly.Can import Monitoring Data into host computer by serial ports, so that further analyzing and processing.
Four, description of drawings
Fig. 1 is the overall system block diagram of the utility model intelligence oil quality monitor;
Fig. 2 is the utility model intelligence oil quality monitor work general flow chart
Fig. 3 is the structural representation of the utility model intelligence oil quality monitor embodiment 1 viscosity probe;
Fig. 4 is the structural representation of the utility model intelligence oil quality monitor embodiment 2 viscosity probe;
Fig. 5 is the utility model qcm sensor metering circuit schematic diagram;
Fig. 6 is the utility model capacitive sensor configuration diagram;
Fig. 7 is the utility model dielectric constant metering circuit block diagram;
Fig. 8 is the utility model dielectric constant metering circuit schematic diagram;
Fig. 9 is the utility model oil quality monitoring fusion structure diagrammatic sketch.
Five, embodiment
Understand the utility model for clearer, the utility model is described in further detail below in conjunction with drawings and Examples.
Referring to Fig. 1, shown in Figure 1 is the overall system block diagram of the utility model intelligence oil quality monitor, in Fig. 1, the 1st, the AT89C52 single-chip microcomputer, the 2nd, measure and use viscosity sensor, the 3rd, with reference to using quartz crystal sensor, the 4th, capacitive transducer, the 5th, oscillatory circuit, the 6th, electric capacity freq converting circuit, the 7th, the DS1820 temperature sensor, the 8th, Max813 supervisory circuit, the 9th, keyboard load module, the 10th, Max7219 serial led driver, the 11st, led driver, the 12nd, MAX232 communication module.
Intelligent oil quality on-line monitoring instrument of the present utility model can be divided into following a few part: (1) Single Chip Microcomputer (SCM) system; (2) viscosity measurement module; (3) dielectric constant measurement module; (4) temperature-measuring module; (5) man-machine conversation module (comprising keyboard load module, display module and warning circuit); (6) communication module.Fully adopt the newest fruits and the low power dissipation design thought of integrated circuit, make the circuit board volume little, low in energy consumption.
This intelligence oil quality monitor comprises, the circuit that is provided with in an Instrument shell and the housing; Circuit part comprises: with a single-chip microcomputer 1 is the microprocessor of core, be characterized in that it is the communication module 12 of MAX232 and the storer 13 that model is 24C04 that single-chip microcomputer 1 is connected with oscillatory circuit 5, electric capacity freq converting circuit 6, temperature sensor 7, supervisory circuit 8, keyboard load module 9, serial led driver 10, model; Oscillatory circuit 5 is connected with to be measured with viscosity sensor 2 with reference to using quartz crystal 3, and electric capacity freq converting circuit 6 is connected with capacitive transducer 4, and serial led driver 10 is connected with light-emitting diode display 11.
The workflow of intelligence oil quality monitor as shown in Figure 2.At first, instrument carries out self check, from storer 24C04, read setup parameter again and carry out initialization, monitor is in holding state then, wait command, enter different program circuits respectively according to different orders, comprise temperature monitoring, viscosity monitoring, specific inductive capacity monitoring, merge and the flow process that resets, after carrying out each diffusing turn of tidal stream journey, this monitor is in time sent the correlation parameter that collects into host computer by serial communication mode, carry out warehouse-in work, continue then to carry out original diffusing carryover preface, till new order is arranged.
1 Single Chip Microcomputer (SCM) system
The CPU of monitor adopts the 89C52 controller that carries 8k byte electric erasable formula program storage, ratio of performance to price height; In order to guarantee work reliably steady in a long-term, native system has adopted the μ P monitoring chip Max813 of excellent performance, and it collects reset controller, and WatchDog Timer has strengthened the integrated level and the reliability of system; In addition, storer 24C04 is used for the storage of model parameter.
2 show and warning circuit
This system has selected the very high Max7219 display driver module of integrated level for use, it is a kind of novel, Multi-bit LED driver module, adopt simple three-way SPI interface, inner clock circuit, need not characteristics such as any peripheral cell, Presentation Function variation, compare with the display driver circuit of system in the past, it simplifies hardware configuration, saved the resource of Single Chip Microcomputer (SCM) system, systemic-function also is improved; Warning circuit mainly is made up of hummer and light emitting diode, is used for the systematic parameter warning of crossing the border.
3 communication modules
For temperature, viscosity and the dielectric constant values of the oil product that will be measured deposits in the host computer database, native system adopts MAX232 to realize communication between AT89C52 Single Chip Microcomputer (SCM) system and the industrial computer.
4 viscosity measurement modules
(1) measuring principle
At present the most frequently used viscosity is in respect of the cylinder rotary viscosimeter, ultrasonic viscometer, capillary pressuring difference formula viscosity meter, falling ball viscometer etc., their complex structures, and sample reach a conclusion and spent chronic from oil product, real-time is relatively poor, only be suitable for lab analysis, be difficult to the viscosity of oil product is carried out effective on-line monitoring.In order to overcome the deficiency of classic method, the utility model proposes a kind of new method of carrying out online oil viscosity monitoring based on QCM (QCM (Quartz Crystal Microbalance)), this method structure is also uncomplicated, and real-time is very strong, satisfies the requirement of the online viscosity analysis of oil product.
QCM plates layer of metal as the two poles of the earth on the two sides of the white sheet of quartz crystal, an electronic oscillating circuit by the outside drives, when adding certain electric field at the two poles of the earth, can cause QCM with certain hunting of frequency, this frequency is to be determined by the viscosity of quality on the electrode and liquid and density.When Kanazawa and Gordon derived quartz crystal and contact with the liquid single face, the fundamental relation formula of liquid viscosity and density and crystal oscillation frequency skew was as follows:
Here η
lBe the absolute viscosity of liquid, ρ
lIt is density of liquid.Δ f is the oscillation frequency skew of crystal, ρ
qAnd μ
qBe respectively the density and the elastic modulus of quartz crystal.So Δ f and (ρ
lη
l) square root linear.Utilize this relation, we can obtain oil viscosity.When installing at the scene, must select the slow position of oil speed, avoid the impact of oil sensing probe.
(2) design of qcm sensor and oscillatory circuit thereof
Quartz crystal oscillator plate with AT cut type has low zero-temperature coefficient, therefore we have selected for use the AT of 2.4M to cut the probe that the quartz crystal oscillator plate is made sensor, in order to delay electrode oxidation in oil, adopted gold-plated electrode, wafer is contacted with oily single face, and the probe synoptic diagram as shown in Figure 3 and Figure 4.What native system was developed is the oscillator of core with the Max913 chip, and its output is the Transistor-Transistor Logic level signal, is convenient to the collection of single-chip microcomputer.Adopt sort circuit, solved the shortcoming of oscillatory circuit driving force difference in the past, make the starting of oscillation that QCM can be stable in liquid, concrete oscillatory circuit as shown in Figure 5.
Quartz crystal and oscillatory circuit thereof in use all have temperature float, the time phenomenon of floating, in use for some time, because the measured value that sensor and circuit self thereof cause changes, this is an error very important in the measuring system, the error that self parameter that the utility model has adopted the method for reference piezoid to eliminate sensor and amplifying circuit changes and brought, guarantee data accurately and reliable.From measuring D end and the CLK end that the two-way square-wave signal of exporting with the QCM oscillatory circuit with QCM oscillatory circuit and reference enters difference frequency device 74LS74 respectively, the difference frequency signal that obtains enters the TO mouth of single-chip microcomputer and counts.
5 dielectric constant measurements
(1) sensing principle
Ignore the influence of impurities in the oil, wet oil can be similar to the mixing of regarding pure oil and pure water two media as, and its effective specific inductive capacity can be used formula (2) expression:
In the formula, ε
rBe the effective dielectric constant of blending agent, ε
1Be the specific inductive capacity of pure water, ε
2Specific inductive capacity for pure oil.Because the specific inductive capacity of oil and water differs greatly, pure oily specific inductive capacity is mostly between 2～7, and the specific inductive capacity of water is 80, than order of magnitude of innage, the variation of Water in oil amount will influence the dielectric constant values of oil product significantly, and therefore the measurement by specific inductive capacity can reflect indirectly whether the content of W/O exceeds standard.In the operational process of machine, make for a certain reason under the situations such as sneaking into moisture in the lubricating oil and all can make the specific inductive capacity generation obvious variation of lubricating oil, thereby cause the variation of sensor capacitance.In other words, in fact the variation of sensor capacitance has reflected the variation of water cut in the fluid.At the requirement of lubricating oil on-line monitoring, capacitive sensor is cheaply adopted in the measurement of the specific inductive capacity of oil.
The capacitive sensor structure as shown in Figure 6, it is to be made of one group of parallel pole in the same plane, wherein S is an emitting electrode, R is a receiving electrode.When the structure and physical dimension one timing of capacitive transducer, electric capacity is
In C=k * ε (3) formula, ε is the specific inductive capacity of medium, and k is a constant, by structure, shape, the size decision of capacitor.
When on-load voltage between emitting electrode and receiving electrode, testing circuit is a changes in capacitance with the change transitions of lubricating oil specific inductive capacity just, and then changes the variation of frequency again into.Can obtain the situation of oil product deterioration by the big or small and variation of analysis frequency.
(2) the detection principle of metering circuit
The variation of the specific inductive capacity of oil is converted to the change amount of electric capacity by capacitive sensor, utilizes the electric capacity freq converting circuit that the conversion of electric capacity is converted to the change of frequency again, and the collection of frequency can be gathered by the counter of 89C52 single-chip microcomputer.The metering circuit of capacitive sensor has bridge type, operational amplifier formula and pulse-width-modulating type etc., and this monitor adopts pulse-width-modulating type, measures computing circuit and is made of pulse producer, monostable circuit, pulse-detecting circuit and monolithic counter.Pulse-width-modulating type Measuring Dielectric Constant schematic block circuit diagram as shown in Figure 7.
Wherein pulse producer and monostable circuit are made of time base circuit NE556, and circuit theory diagrams such as Fig. 8 include two identical integrated timer IC1a, IC1b.By outward element R1, R2, C1 and timer IC1a constitute an astable multivibrator, and its oscillator frequency is
f＝1.44/[(R1+2R2)C1] (4)
The oscillation frequency that calculates the 5 pin output of IC1a according to formula 4 is 60Hz, constitutes a pulse producer, and output connects 8 pin of IC1b.By outward element R3, Cx and timer IC1b constitute an one shot multivibrator, and Cx is exactly the capacitive sensor that detects usefulness, because changes in capacitance, the monostable time-delay of circuit is different, and duty of ratio depends on the capacitance of sensor, and the oscillator frequency of its output is
f＝1.1/(R3Cx) (5)
After R4, C4 carried out low-pass filtering to output signal, frequency signal entered the counter mouth of single-chip microcomputer 89C52 and handles.Therefore the specific inductive capacity of oil is
ε＝Cx/k＝1.1/(R3fk)＝K/f (6)
6 temperature surveys
In the hydraulic system or lubricating system of main equipment, it is not enough only carrying out the single-point temperature survey, should detect the temperature of multiple spot fluid, and therefore selecting for use a plurality of DS1820 to constitute the measurement and control of temperature network is very easily.In the monitoring in real time of the temperature of the utility model oil product in the oil quality intelligent analytical instrument, adopted new digital temperature sensor DS1820.It is a kind of unibus system digital temperature sensor, and the unibus system system is meant on a bus can articulate a main frame, a plurality of slave, and the DS1820 sensor is exactly the slave in the unibus system.System that DS1820 forms has abandoned temperature sensor in the past need add the form of being made up of a lot of components and parts that ADC converts digital quantity to, constitutes the high single bus interface of a kind of cost performance.
7 Multi-source Information Fusion
In the parameter of oil quality monitoring, temperature all has considerable influence to oil viscosity and specific inductive capacity, therefore use the data fusion technology of multisensor, can reduce the susceptibility of system to defect sensor, do not need too high precision, do not need complicated signal Processing yet, can also improve the accuracy of judgement.
The utility model merges the data of the sensor that records, and be divided into two processes: the first order is that the characteristic parameter that influences output signal is carried out fusion treatment, draws the index that can reflect diagnosis object, and as the basis of subsequent treatment.The second level is the information fusion diagnosis, and it is that a plurality of dissimilar sensor signals are carried out information fusion, and the state from a plurality of information viewpoints judgement diagnosis objects has improved the utilization factor of information and the accuracy of state recognition, and fusion structure figure as shown in Figure 9.
(1) first order merges
The viscosity of fluid and specific inductive capacity all can change with the variation of oil temperature, therefore, improve measuring accuracy, must carry out the gamma correction of medium temperature compensation and multiparameter.Common detection oil viscosity carries out under constant temperature, still, if increase thermostat, will inevitably increase the complicacy and the cost of instrument.Theoretical study results shows that the input/output relation of any complicated function all can approach with a multi-layer perception network more than three layers or three layers.Therefore, can utilize neural network to set up corresponding network model,, send into neural metwork training through training the relation of finding out between oil viscosity and temperature, specific inductive capacity and the temperature as instrument.The first order merges two 3 layers feed-forward type ANN network of employing, and each network of network structure is 2-8-1, and the output of two networks is respectively 40 ℃ of following oil viscosity values and dielectric constant values (normalized value), and its learning algorithm adopts error backpropagation algorithm.
(2) merge the second level
After drawing 40 ℃ of following oil viscosity values, oil temperature, specific inductive capacity, utilize the BP network that the running status of oil product is classified, can draw the present state of oil product (normal, light contamination, report to the police and scrap).The utility model adopts off-line training, the mode of on-line operation, the training of neural network is carried out on microcomputer, use Matlab Neural Network Toolbox commonly used on the engineering that sample data is trained, after training finishes, the network parameter that obtains is deposited among the 24C04 of intelligent oil quality on-line monitoring instrument, utilize single-chip microcomputer to monitor in real time.
The utility model has used QCM (Quartz Crystal Microbalance) (QCM) as the viscosity measurement sensor, this method in principle, structure and uncomplicated, and real-time is very strong satisfies the requirement that the online viscosity of oil product is analyzed.Introduce the data fusion technology, set up the neural network model of oil quality analysis-by-synthesis, improved the measurement reliability of intelligent oil quality monitor widely.Along with the continuous increase of sample data and the research of oil product degradation mechanism, this model will be more perfect, and oil quality analysis is from now on realized that further robotization has great significance.
In order to implement the utility model, the inventor has provided following embodiment.
Fig. 3, Fig. 4 are two kinds of concrete embodiments of the utility model viscosity probe.
The design of QCM probe must be satisfied the requirement of stable oscillation stationary vibration in the fluid environment.The structure of sensor probe is very big to the performance impact of oscillator, will follow following principle to the design of probe:
A. make every effort to sensor and have smaller volume and quality, and be convenient to on-the-spot the installation.
B. reduce the fluid damping that wafer is subjected to, make crystal be easy to starting of oscillation.
C. guaranteeing that oil does not infiltrate under another surperficial prerequisite of wafer, should reduce the influence of packing forms as much as possible, reduce encapsulation stress the crystal oscillation parameter.
In order to reduce damping, the QCM probe of present embodiment design adopts single face to touch the liquid type, and the structure of probe can have two kinds according to the difference of wafer installation site, respectively as shown in Figure 3, Figure 4, wherein, the 14th, end cap, the 15th, quartz crystal oscillator plate, the 16th, electrode, the 17th, binding post, the 18th, bakelite housing.Probing shell adopts the bakelite material of oil resistant, the method of adopt glueing joint is fixed on wafer on the housing with epoxy resin, notices that resin must evenly spread upon between wafer and the housing, binding post and wire bonds together after, must seal with epoxy resin, prevent that oil immersion from going in the lead.Adopt this single face to touch liquid type structure, two electrodes of qcm sensor are isolated on electric mutually, and, reduced the damping of fluid, make the easy starting of oscillation of crystal piezoid because wafer has only one side to contact with fluid.Because the quartz crystal oscillator plate is thinner, thus should guarantee that when mounted quartz crystal is vertical mutually with the bakelite housing, and make the electrode of wafer be in the center of cylindrical shell.
Claims (8)
1. an intelligent oil quality monitor comprises, the circuit that is provided with in an Instrument shell and the housing; Circuit part comprises: with a single-chip microcomputer [1] is the microprocessor of core, it is characterized in that single-chip microcomputer [1] is connected with oscillatory circuit [5], electric capacity freq converting circuit [6], temperature sensor [7], supervisory circuit [8], keyboard load module [9], serial led driver [10], communication module [12] and storer [13]; Oscillatory circuit [5] is connected with to be measured with viscosity sensor [2] with reference to using quartz crystal [3], and electric capacity freq converting circuit [6] is connected with capacitive transducer [4], and serial led driver [10] is connected with light-emitting diode display [11].
2. intelligent oil quality monitor according to claim 1 is characterized in that: described measurement is a QCM (Quartz Crystal Microbalance) with viscosity sensor [2], and version adopts single face to touch the liquid type; The model of described oscillatory circuit [5] adopts MAX913, and its output is the Transistor-Transistor Logic level signal, is convenient to the collection of single-chip microcomputer.
3. intelligent oil quality monitor according to claim 1 is characterized in that: described capacitive transducer [4] is a capacitive sensor.
4. intelligent oil quality monitor according to claim 1 is characterized in that: the model of described communication module [12] is MAX232.
5. intelligent oil quality monitor according to claim 1 is characterized in that: the model of described storer [13] is 24C04.
6. intelligent oil quality monitor according to claim 1 is characterized in that: the model of described temperature sensor [7] is DS1820.
7. intelligent oil quality monitor according to claim 1 is characterized in that: the model of described serial led driver [10] is Max7219.
8. intelligent oil quality monitor according to claim 1 is characterized in that: the model of described supervisory circuit [8] is Max813.
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