CN101251503A - Method for automatic detection of vehicle engine oil dirtiness - Google Patents
Method for automatic detection of vehicle engine oil dirtiness Download PDFInfo
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- CN101251503A CN101251503A CNA2007101724693A CN200710172469A CN101251503A CN 101251503 A CN101251503 A CN 101251503A CN A2007101724693 A CNA2007101724693 A CN A2007101724693A CN 200710172469 A CN200710172469 A CN 200710172469A CN 101251503 A CN101251503 A CN 101251503A
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Abstract
The invention relates to a method for automatic detection of the automobile engine oil contamination level. The invention is characterized in that: two electrodes of a capacitance sensor are arranged inside an engine oil medium, and critical failure capacitance values of various engine oils used by vehicles are stored into a singlechip; the capacitance sensor and the singlechip form a detection system which integrates detection and alarm into a whole through a control circuit; when the sensed capacitance value of a capacitor which is arranged inside the engine oil medium reaches an allowable engine oil critical failure value which is stored in the singlechip due to use contamination of vehicle engine oils, alarm is initiated for replacement of clean engine oils. Automatic on-line test of the automatic engine oil contamination level can be realized without extraction of an engine oil sample from an automobile sump under the condition of parking and without the necessity of detection of specialized technical personnel; the engine oil contamination level and an engine oil failure alarm signal can be provided in time, and the detection precision and the detection efficiency are improved. Moreover, the method is convenient in replacement of the engine oils according to the quality and maintenance and saves resources and the maintenance cost, and simultaneously can guarantee normal lubrication of an engine. Because a detection system is measured and controlled by the singlechip, the volume is small; the cost is low; the structure is simple; the use is simple and convenient; the detection system is convenient to realize.
Description
Technical field
The present invention relates to a kind of method of automatic detection automobile engine oil dustiness, belong to automobile engine oil detection technique class.
Background technology
Along with the China's economic prosperity development, the raising of family income, the decline of vehicle price, increasing average family begins to buy automobile, and the maintenance of automobile also just more and more comes into one's own.Usually, automobile engine oil descends owing to reasons such as oil oxidation, pollution can make the quality of himself in use for some time, loses the lubrication protection effect to engine.At present, the management of the automobile engine oil of China is the traditional mode of continuing to use " observation is changed oil " or " on schedule changing oil " basically, promptly with observation, experience and subjective judgement or according to definite oil changing interval of the cycle of machine oil use.Will inevitably cause the waste of fluid resource like this, shorten maintenance period.The replacement cycle of machine oil should be determined on a case-by-case basis in fact.Though method is to be about 5000km the drain period in general, must be in conjunction with specification and quality, the situation of engine and the factors such as environment for use of automobile of machine oil itself, take all factors into consideration and suitably shorten or prolong the replacement cycle.She Ji the pick-up unit that is directed to the automobile engine oil quality is fewer at home, if want to obtain to detect comparatively accurately data, then needs the stripping oil fluid samples, again through special detection means measure, and so process very inconvenience for traveling automobile.If the simple foreign technology strength that relies on, then price is very expensive, runs counter to original intention.
Summary of the invention
Purpose of the present invention is intended to: a kind of novel automobile engine oil intelligent on-line detection method is provided, do not need to extract the sample of automobile engine oil, insert as long as when using for the first time sensor is detected the hole from automobile engine oil, just can realize the online product that detects the automobile engine oil pollution level; It can measure automobile easily, accurately at the dustiness with machine oil, so that the car owner in time changes oil by matter.Reach and both save resource and upkeep cost, can ensure normal working of engine again.
The present invention reaches the purpose of foregoing invention by following approach:
The method of this automatic detection automobile engine oil dustiness is characterized in that: the two poles of the earth of a capacitive transducer 1 are placed the machine oil medium, and the borderline failure capacitance of the various machine oil of vehicles is stored in the single-chip microcomputer 5; Then capacitive transducer 1 and single-chip microcomputer 5 are formed a detection system that integrates detection and report to the police by control circuit, treat because the sensed capacitance of automotive engine oil through use polluting the back, causing the capacitor that places the machine oil medium when reaching the machine oil borderline failure value that is stored in permission in the single-chip microcomputer 5, cause and report to the police, machine oil is cleaned in changing of announcement.
Described control circuit comprises: capacitive transducer 1, oscillatory circuit 2, amplifying circuit 3, waveform changing circuit 4, single-chip microcomputer 5, display circuit 6, warning circuit 7 and keyboard circuit 8; Capacitive transducer 1 links to each other with transformer 9 primary inductances in the oscillatory circuit 2, forms the LC self-maintained circuit; Oscillatory circuit 2 is delivered to amplification in the amplifying circuit 3 with the voltage that obtains under stable status after the starting of oscillation; Amplified analog signal is converted to the waveform signal that single-chip microcomputer 5 can be accepted through waveform changing circuit 4; 5 pairs of waveform signals of single-chip microcomputer are analyzed, and judge whether machine oil lost efficacy, simultaneously display circuit 6 display machines oil contamination information; Keyboard circuit 8 links to each other with single-chip microcomputer 5, is used to import the brand and model of detected machine oil that automobile uses and adjusts pre-deposit data; Output terminal by single-chip microcomputer connects the warning circuit warning.
The method of this automatic detecting machine oil contamination degree that proposes according to above technical scheme, not be used in and from the automobile engine oil case, take out the machine oil oil sample under the dead ship condition, do not need the professional and technical personnel to detect yet, just can realize the on-line automatic test of automobile engine oil dustiness; Oil pollution degree and machine oil Failure Alarm signal be can provide in time, accuracy of detection and detection efficiency improved.Both be convenient to change oil and maintain, save resource and upkeep cost, and can have ensured that also engine lubrication was normal simultaneously by matter.Because detection system adopts scm observe and control, volume is little, price is low, and is simple in structure, and easy to use being convenient to realized.
Description of drawings
Fig. 1 is a theory diagram of the present invention;
Fig. 2 is a liquid crystal display circuit part schematic diagram of the present invention;
Fig. 3 is a film key circuit part schematic diagram of the present invention;
Fig. 4 is a warning circuit part schematic diagram of the present invention;
Fig. 5 is an oscillatory circuit part schematic diagram of the present invention;
Fig. 6 is a signal amplification circuit part schematic diagram of the present invention;
Fig. 7 is a waveform changing circuit part schematic diagram of the present invention;
Fig. 8 is a software flow pattern of the present invention;
Fig. 9 is an integrated circuit schematic diagram of the present invention.
Wherein: 1. capacitive transducer, 2. oscillatory circuit, 3. amplifying circuit, 4. waveform changing circuit, 5. single-chip microcomputer, 6. display circuit, 7. warning circuit, 8. keyboard circuit, 9. transformer, 10. schmidt trigger circuit, 11. frequency dividing circuits.
Embodiment
The present invention is further described below in conjunction with drawings and Examples.
The method of this automatic detection automobile engine oil dustiness is characterized in that: the two poles of the earth of a capacitive transducer 1 are placed the machine oil medium, and the borderline failure capacitance of the various brand and model machine oil of vehicles is stored in the single-chip microcomputer 5; Then capacitive transducer 1 and single-chip microcomputer 5 are formed a detection system that integrates detection and report to the police by control circuit, treat because the sensed capacitance of automotive engine oil through use polluting the back, causing the capacitor that places the machine oil medium when reaching the machine oil borderline failure value that is stored in permission in the single-chip microcomputer 5, cause to report to the police accuse, replacings clean machine oil.
Described control circuit comprises: capacitive transducer 1, oscillatory circuit 2, amplifying circuit 3, waveform changing circuit 4, single-chip microcomputer 5, display circuit 6, warning circuit 7 and keyboard circuit 8; Capacitive transducer 1 links to each other with transformer 9 primary inductances in the oscillatory circuit 2, forms the LC self-maintained circuit; Oscillatory circuit 2 is delivered to amplification in the amplifying circuit 3 with the voltage that obtains under stable status after the starting of oscillation; Amplified analog signal is converted to the waveform signal that single-chip microcomputer 5 can be accepted through waveform changing circuit 4; 5 pairs of waveform signals of single-chip microcomputer are analyzed, and judge whether machine oil lost efficacy, simultaneously display circuit 6 display machines oil contamination information; Keyboard circuit 8 links to each other with single-chip microcomputer 5, is used to import the brand and model of detected machine oil that automobile uses and adjusts pre-deposit data; Output terminal by single-chip microcomputer connects the warning circuit warning.
Described waveform conversion circuit 4 comprises schmidt trigger circuit 10 and frequency dividing circuit 11, the signal of amplifying circuit 3 outputs obtains the square wave of waveform rule after schmidt trigger circuit 10 conversions, again with this square wave interruption input signal as single-chip microcomputer 5 after frequency dividing circuit 11 frequency divisions.
Described pick-up unit comprises warning circuit 7, and described warning circuit 7 links to each other with single-chip microcomputer 5, when single-chip microcomputer 5 is judged signal averaging frequency that sampling obtains greater than the certain value of built-in machine oil borderline failure frequency of the same race, starts warning circuits 7 by single-chip microcomputer 5 and reports to the police.
Described frequency dividing circuit 11 is the three frequency division circuit.
Described amplifying circuit 3 comprises triode Q3, the Q3 base stage is connected between biasing resistor R4 and the R6, resistance R 4 and R6 are connected between power supply and the ground, resistance R e2 is connected between Q3 emitter and the ground, resistance R 5 is connected between power supply and the collector, the Q3 collector is by capacitor C 2 output signals, and resistance R L is connected between output and the ground.
Described emitter resistance Re2 is in parallel with capacitor C e2, with the AC signal bypass, to reduce the interchange negative feedback of (Re2).
9 levels of transformer in the described oscillatory circuit 2 link to each other with resistance R 2, and the centre tap of resistance R 2 links to each other with triode Q2 base stage by capacitor C b1.
Described single-chip microcomputer 5 adopts the AT89C52 chip.
The LCDs of described display circuit 6 adopts YEJHD12864A series LCDs.
When this method of use, capacitive transducer is detected the hole from automobile engine oil to be put into the machine oil pond and immerses the machine oil certain depth, send into single-chip microcomputer behind signal process oscillator, wave filter, amplifier and the shaping circuit that capacitive transducer receives, single chip computer measurement is sent into the frequency of signal, has stored the borderline failure frequency that various brand and model machine oil utilize this detecting instrument to measure in the single-chip microcomputer in advance; Single-chip microcomputer is comparing with the frequency of machine oil and built-in brand machine oil borderline failure frequency of the same race detected again, such process repeats 10 minutes, if it is detected when surpassing certain value greater than the number of times of borderline failure frequency in 10 minutes with the frequency of machine oil, single-chip microcomputer will be made decision and be thought and losing efficacy with machine oil, automobile needs more change engine oil, alarm sends chimes of doom, shows on the display screen that machine oil lost efficacy.
As the described a kind of embodiment of accompanying drawing, wherein pick-up unit with automobile storage battery as power supply.As shown in Figure 1, pick-up unit obtains the original capacitance value by capacitive transducer.Inductance in capacitive transducer and the oscillatory circuit is formed the LC self-maintained circuit.Oscillatory circuit is delivered to the voltage that obtains again under the stable status after starting of oscillation and is amplified 4-5 in the amplifying circuit doubly, amplified analog signal is converted to the waveform signal that single-chip microcomputer can be accepted through schmidt trigger circuit and frequency dividing circuit again, single-chip microcomputer carries out analysis of accounts to this signal, if when the signal frequency that obtains of sampling reaches certain value greater than the number of times of built-in machine oil borderline failure frequency of the same race in 10 minutes, single-chip microcomputer will start warning circuit reports to the police, and display circuit shows the machine oil fail message simultaneously.Single-chip microcomputer among the present invention adopts the AT89C52 chip.
Fig. 2 is a liquid crystal display circuit, and LCDs adopts YEJHD12864A series LCDs, and main effect is that the oil pollution information that single-chip microcomputer is exported is presented on the LCDs.
Fig. 3 is a key circuit, and button wherein adopts film key, before the start detection device detects, needs the brand and model of the detected machine oil that automobile uses of input earlier, so that call corresponding data in the database.
Fig. 4 is a warning circuit, and warning circuit adopts buzzer warning, and when the oil pollution degree surpassed critical value, the Micro Controller Unit (MCU) driving hummer sent alerting signal.
Fig. 5 is an oscillatory circuit, transformer adopting radio I.F.T. among the figure.The capacitive transducer elementary with in parallel of transformer has constituted the LC self-excitation resonant circuit of frequency-selecting effect.The secondary of transformer provides positive feedback signal to amp.in.During energized, faint transient current can occur in the LC loop, but have only frequency and loop resonance frequency f
0Identical electric current could produce higher voltage at the two ends, loop, this voltage is got back to transistorized base stage again by elementary, the secondary coupling of transformer.Transformer feedback formula oscillatory circuit is realized coupling and feedback by mutual inductance, is easy to realize impedance matching and reaches the starting of oscillation requirement, so efficient is higher.
Fig. 6 is an amplifying circuit, because the output of the fixed ampllitude of oscillatory circuit has only about 1V, doubly send single-chip microcomputer to handle again so need to amplify 4-5, and this circuit has been selected the amplifying circuit of partial pressure type Current Negative Three-Point Capacitance biasing for use.The advantage of this circuit is that the mode of the Current Negative Three-Point Capacitance that can produce by base resistance dividing potential drop and emitter resistance Re2 is stablized quiescent point.For preventing Current Negative Three-Point Capacitance to also generation effect of AC signal, and reduce enlargement factor, capacitor C e2 in parallel produces the bypass effect to AC signal, to reduce the interchange negative feedback of Re2 on emitter resistance Re2.
Fig. 7 is a waveform changing circuit, and waveform changing circuit comprises schmidt trigger circuit 10 and frequency dividing circuit 11.After the schmidt trigger circuit conversion, obtain the square wave of waveform rule from the signal of amplifier output, again with this square wave through after frequency dividing circuit three frequency division as the input signal of the external interrupt INTO of single-chip microcomputer.
Fig. 8 is the main flow chart of scm application system software design.Sensor signal is through being converted into the stable signal that can be discerned by single-chip microcomputer behind the testing circuit, and single-chip microcomputer carries out data processing and alarm indication by application systems software to resulting signal.Single-chip microcomputer carries out as follows to the measurement of frequency, the T0 of single-chip microcomputer is used as timer, regularly 1 second, T1 is as counter, testing circuit is handled the square-wave signal that obtains afterwards directly receive single-chip microcomputer T1 external pulse input end, in the timing of T0 1 second, the pulse of T1 input end is counted, regularly the umber of pulse that counted to get in 1 second that is to say needs the frequency number measured.Circulation is measured 600 times, and just whole measuring process is 10 minutes, if machine oil be underproof number of times greater than 300 times, then point out machine oil to lose efficacy, otherwise, show that machine oil is qualified.
Fig. 9 shows integrated circuit schematic diagram of the present invention.
Claims (2)
1, a kind of method of automatic detection automobile engine oil dustiness is characterized in that: the two poles of the earth of a capacitive transducer (1) are placed the machine oil medium, and the borderline failure capacitance of the various machine oil of vehicles is stored in the single-chip microcomputer (5); Then capacitive transducer (1) and single-chip microcomputer (5) are formed a detection system that integrates detection and report to the police by control circuit, treat to cause the replacing of the announcement of reporting to the police and clean machine oil because the sensed capacitance of automotive engine oil through use polluting the back, causing the capacitor that places the machine oil medium reaches when being stored in the machine oil borderline failure value that allows single-chip microcomputer (5) in.
2, the method for a kind of automatic detection automobile engine oil dustiness as claimed in claim 1, it is characterized in that: described control circuit comprises: capacitive transducer (1), oscillatory circuit (2), amplifying circuit (3), waveform changing circuit (4, single-chip microcomputer (5), display circuit (6), warning circuit (7) and keyboard circuit (8); Capacitive transducer (1) links to each other with transformer (9) primary inductance in the oscillatory circuit (2), forms the LC self-maintained circuit; Oscillatory circuit (2) is delivered to amplification in the amplifying circuit (3) with the voltage that obtains under stable status after the starting of oscillation; Amplified analog signal is converted to the waveform signal that single-chip microcomputer (5) can be accepted through waveform changing circuit (4); Single-chip microcomputer (5) is analyzed waveform signal, judges whether machine oil lost efficacy, simultaneously display circuit (6) display machines oil contamination information; Keyboard circuit (8) links to each other with single-chip microcomputer (5), is used to import the brand and model of detected machine oil that automobile uses and adjusts pre-deposit data; Output terminal by single-chip microcomputer connects the warning circuit warning.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101724693A CN101251503A (en) | 2007-12-18 | 2007-12-18 | Method for automatic detection of vehicle engine oil dirtiness |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101724693A CN101251503A (en) | 2007-12-18 | 2007-12-18 | Method for automatic detection of vehicle engine oil dirtiness |
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| CN101251503A true CN101251503A (en) | 2008-08-27 |
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| CNA2007101724693A Pending CN101251503A (en) | 2007-12-18 | 2007-12-18 | Method for automatic detection of vehicle engine oil dirtiness |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101655457B (en) * | 2009-09-22 | 2011-01-12 | 孟国营 | Detection method and sensor for overloading gear oil dustiness |
| CN102830085A (en) * | 2012-08-30 | 2012-12-19 | 浙江吉利汽车研究院有限公司杭州分公司 | Detection device for engine oil performance of engine |
| CN102103107B (en) * | 2009-12-16 | 2013-01-02 | 上海神开石油化工装备股份有限公司 | Detection instrument for detecting quality of lubricating oil by capacity effect and detection method thereof |
| CN102998360A (en) * | 2012-12-25 | 2013-03-27 | 重庆勤智科技有限公司 | Online testing method for aging of transformer insulating oil based on electric field induction |
| CN103884742A (en) * | 2014-01-27 | 2014-06-25 | 綦升军 | Pollution level detector for vegetables and fruits |
| CN105143877A (en) * | 2013-03-15 | 2015-12-09 | 玛斯特股份有限公司 | Multi-modal fluid condition sensor platform and system thereof |
| CN105143879A (en) * | 2013-03-15 | 2015-12-09 | 玛斯特股份有限公司 | Multi-modal fluid condition sensor platform and system thereof |
| CN106151169A (en) * | 2015-04-01 | 2016-11-23 | 徐工集团工程机械股份有限公司 | A kind of oil product detection devices and methods therefor |
| CN112697663A (en) * | 2020-11-16 | 2021-04-23 | 中国石油天然气股份有限公司 | Liquid purity monitoring device and method |
-
2007
- 2007-12-18 CN CNA2007101724693A patent/CN101251503A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101655457B (en) * | 2009-09-22 | 2011-01-12 | 孟国营 | Detection method and sensor for overloading gear oil dustiness |
| CN102103107B (en) * | 2009-12-16 | 2013-01-02 | 上海神开石油化工装备股份有限公司 | Detection instrument for detecting quality of lubricating oil by capacity effect and detection method thereof |
| CN102830085A (en) * | 2012-08-30 | 2012-12-19 | 浙江吉利汽车研究院有限公司杭州分公司 | Detection device for engine oil performance of engine |
| CN102998360A (en) * | 2012-12-25 | 2013-03-27 | 重庆勤智科技有限公司 | Online testing method for aging of transformer insulating oil based on electric field induction |
| CN102998360B (en) * | 2012-12-25 | 2015-03-04 | 重庆勤智科技有限公司 | Online testing method for aging of transformer insulating oil based on electric field induction |
| CN105143877A (en) * | 2013-03-15 | 2015-12-09 | 玛斯特股份有限公司 | Multi-modal fluid condition sensor platform and system thereof |
| CN105143879A (en) * | 2013-03-15 | 2015-12-09 | 玛斯特股份有限公司 | Multi-modal fluid condition sensor platform and system thereof |
| CN103884742A (en) * | 2014-01-27 | 2014-06-25 | 綦升军 | Pollution level detector for vegetables and fruits |
| CN106151169A (en) * | 2015-04-01 | 2016-11-23 | 徐工集团工程机械股份有限公司 | A kind of oil product detection devices and methods therefor |
| CN106151169B (en) * | 2015-04-01 | 2018-07-17 | 徐工集团工程机械股份有限公司 | A kind of oil product detection device and its method |
| CN112697663A (en) * | 2020-11-16 | 2021-04-23 | 中国石油天然气股份有限公司 | Liquid purity monitoring device and method |
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Application publication date: 20080827 |