CN108845002A - A kind of methanol gasoline concentration detection apparatus and method - Google Patents
A kind of methanol gasoline concentration detection apparatus and method Download PDFInfo
- Publication number
- CN108845002A CN108845002A CN201810690391.2A CN201810690391A CN108845002A CN 108845002 A CN108845002 A CN 108845002A CN 201810690391 A CN201810690391 A CN 201810690391A CN 108845002 A CN108845002 A CN 108845002A
- Authority
- CN
- China
- Prior art keywords
- methanol concentration
- type sensor
- capacitance type
- methanol
- pole plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
- G01N27/226—Construction of measuring vessels; Electrodes therefor
Abstract
The invention discloses a kind of methanol gasoline concentration detection apparatus and methods.Detection device includes measurement module, signal processing module and display module.Wherein measurement module is made of arc-shaped capacitance type sensor, and arc-shaped capacitance type sensor is placed in methanol gasoline mixed fuel；Signal processing module is made of capacitance-voltage circuit, Freescale single-chip microcomputer, RS232 serial port circuit and CAN bus telecommunication circuit, signal processing module is by methanol concentration signal, the processing of conversion and single-chip microcontroller through capacitance-voltage circuit is sent to display module by serial ports and is communicated by CAN bus telecommunication circuit with general control system；Display module dynamically shows the concentration of methanol in current methanol gasoline mixed fuel.The present invention can rapidly and precisely measure the concentration of methanol in methanol gasoline mixed fuel, and can display in real time this concentration information.
Description
Technical field
The present invention relates to methanol concentration detections, and in particular to a kind of detection device of methanol gasoline mixed fuel methanol concentration
And method.
Background technique
The new-energy automobile of burning methanol gasoline mixed fuel, can be used methanol gasoline, can also be when adding oil plant
Pure gasoline is added, fuel delivery mode is more flexible, but needs according to the actual concentrations of methanol in interior fuel combination come dynamic
Change the fuel injection amount of engine, to guarantee the dynamic property of automobile.The concentration of methanol in real-time accurate detection fuel combination,
The fuel injection amount for changing engine for automobile ECU dynamic provides reference frame.
On the new-energy automobile of existing filling methanol gasoline mixed fuel, current automobile power is usually perceived by driver
Situation, and the fuel injection amount of manual adjustment engine, this easily causes the waste of fuel and the damage of engine.
Methanol concentration detection device utilizes the dielectric constant property that there is some difference of different methanol concentration fuel combinations,
The methanol concentration in fuel combination is detected by the capacitance type sensor that a pair of plates (pole plate) is constituted.Although can be
The adjusting of fuel injection amount provides reference frame, but since testing result precision is poor, effectively can not guarantee automobile power
While, reduce the unnecessary consumption of fuel.
Summary of the invention
Measurement accuracy to solve the problems, such as methanol concentration in methanol gasoline mixed fuel is insufficient, and the present invention provides one kind
Methanol gasoline concentration detection apparatus and method.
In order to achieve the above objectives, the invention adopts the following technical scheme：
A kind of methanol concentration detection device, the detection device include measurement module, and the measurement module includes that condenser type passes
Sensor, the capacitance type sensor use arc pole plate.
Preferably, the arc pole plate includes ontology and uniform fold made of metallic copper in the resistance to of the body surface
Insulating materials (such as green oil) layer of corrosion, the insulation material layer with a thickness of 0.05-0.1mm.
Preferably, the capacitance type sensor includes two opposite arc pole plates, and the shape of arc pole plate is that radian is
120 ° of arc surface, cambered surface internal diameter are 10mm, the length (i.e. the distance between two curved edge of pole plate) and thickness of arc pole plate
Respectively 80mm and 0.5mm, the maximum spacing of two arc pole plates are 10mm.
Preferably, the capacitance type sensor is set in the spray bar of fuel combination automobile to be measured, the spray bar packet
The section for installing arc pole plate is included, the internal diameter of the section is 20mm, and length is that 100mm (is longer than arc pole plate length, is convenient for
Substrate installation, also improves detection accuracy).
Preferably, the arc pole plate is arranged symmetrically along the spray bar central axis, the concave side of two arc pole plates
Relatively, it is fixed between the convex side of arc pole plate and the oil spout inside pipe wall by nylon mounting bracket.
Preferably, the detection device further includes signal processing module and display module, and the signal processing module includes
Capacitance-voltage conversion circuit, single-chip microcontroller, display interface circuit and dual CAN bus telecommunication circuit；The capacitance-voltage conversion
Circuit includes the oscillator, limiting amplifier and frequency discriminator being sequentially connected, and oscillator is connected with the capacitance type sensor, frequency discrimination
Device, display interface circuit and dual CAN bus telecommunication circuit are connected with single-chip microcontroller respectively, and display module includes and display interface electricity
The connected touch screen in road.
A kind of methanol concentration detection method, includes the following steps：
1) above-mentioned capacitance type sensor is placed in the spray bar of fuel combination automobile to be measured；
2) it is measured using methanol concentration of the capacitance type sensor to fuel combination in spray bar, utilizes above-mentioned electricity
The measurement result of capacitance type sensor is converted to voltage signal by appearance-voltage conversion circuit；
3) methanol concentration is calculated according to voltage signal using above-mentioned single-chip microcontroller, then communicates electricity using above-mentioned dual CAN bus
Road is output on automobile CAN-bus.
Preferably, the step 2) specifically includes following steps：
2.1) methanol concentration of fuel combination is converted into corresponding frequency first with above-mentioned oscillator and capacitance type sensor
The oscillator signal of rate；
2.2) shaping is carried out to oscillator signal using above-mentioned limiting amplifier, eliminates high-frequency interferencing signal；
2.3) voltage signal is converted to by the oscillator signal of shaping by what step 2.2) obtained using above-mentioned frequency discriminator, it should
The size of signal reflects the concentration of methanol.
Preferably, the step 3) is further comprising the steps of：Simultaneously using above-mentioned display interface circuit and touch screen to first
Determining alcohol is shown.
The beneficial effects of the present invention are embodied in：
The capacitance type sensor that the present invention uses arc pole plate to constitute, effectively increases polar plate area, has and preferably surveys
Measure sensitivity, not only can in real time in accurate detection fuel combination methanol concentration, also improve methanol concentration detection accuracy,
The fuel injection amount that engine can be changed for automobile ECU dynamic provides more accurate reference frame, has effectively achieved and is protecting
While demonstrate,proving automobile power, reduce the unnecessary consumption of fuel.The present invention passes condenser type using capacitance-voltage conversion circuit
The measurement result of sensor carries out signal processing, can obtain accurate methanol concentration signal.
Further, capacitance-voltage conversion circuit proposed by the present invention, using oscillation, shaping, frequency discrimination Implement of Function Module
Detection to methanol concentration signal, improves detection accuracy.
Further, display interface circuit and dual CAN bus telecommunication circuit proposed by the present invention, it is dense to may be implemented methanol
The real-time display of degree and accurate, timely methanol concentration information is provided for automotive control system (ECU).
Detailed description of the invention
Fig. 1 is system structure diagram of the invention；
Fig. 2 is the structural schematic diagram of the arc pole plate (electrode) of capacitance type sensor of the present invention；
Fig. 3 is the side schematic view of arc pole plate (electrode) of the present invention；
Fig. 4 a is the circuit diagram of signal processing module of the present invention；
Fig. 4 b is the circuit diagram of frequency discriminator of the present invention, limiting amplifier and oscillator；
Fig. 5 is the schematic diagram of dual CAN bus telecommunication circuit of the present invention；
Fig. 6 is the connected mode schematic diagram of capacitance type sensor and the original-pack spray bar of automobile；
Fig. 7 is scheme of installation of the capacitance type sensor in spray bar；
In figure：1 is the oil spout tube section for being equipped with capacitance type sensor；2 be the original-pack oil spout tube section of automobile retained；3
For spray bar；4 be capacitance type sensor；5 be bracket；6 be conducting wire.
Specific embodiment
It elaborates with reference to the accompanying drawings and examples to the present invention.
Referring to Fig. 1, methanol concentration detection device of the present invention is made of upper computer and lower computer, and all detection functions are equal
It is to be controlled to complete by slave computer, is then transmitted to host computer again and carries out display output.Methanol is dense in the next machine testing fuel combination
Degree, and is handled concentration signal, and according to treated, signal calculates methanol concentration and is sent to host computer；Host computer receives
The signal of slave computer simultaneously shows methanol concentration information, and the host computer is communicated with slave computer by ModBus agreement.
The host computer is made of display module, and display module uses the Kunlun on-state touch screen, and MCGS built in touch screen is embedding
Enter formula configuration software, the concentration of methanol in current fuel combination can be displayed in real time.Slave computer is by measurement module and signal
Manage module composition.The touch screen receives the methanol concentration information that signal processing module is issued, and real-time display fuel combination
The concentration information of middle methanol.The signal processing module obtains and (utilizes measurement module), handles methanol concentration signal, and exports first
Determining alcohol information.
The measurement module includes arc-shaped capacitance type sensor 4, and the arc-shaped capacitance type sensor 4 is actually using
When, sensor is completely placed in spray bar 3.Referring to Fig. 6, the installation method of sensor is：By the one of the original-pack spray bar 3 of automobile
The segment pipe that inside is fixed with sensor is connect 3 indentation, there of spray bar formed after truncation, fixes sensor by section truncation
In 3 middle position of automobile spray bar.When automobile engine oil spout, the arc-shaped capacitance type sensor 4 can be completely submerged in
In methanol gasoline mixed fuel.
The signal processing module includes capacitance-voltage conversion circuit, and capacitance-voltage conversion circuit is to methanol concentration signal
It is converted.Signal processing module further includes Freescale single-chip microcomputer, and Freescale single-chip microcomputer counts analog voltage signal
Wordization conversion calculates methanol concentration according to voltage-concentration formula and shows, it is wide then to calculate broadening according to concentration-pulsewidth formula
Degree, for successively controlling fuel injection signal, while starting CAN bus and being communicated.Signal processing module further includes RS232 serial interface
Mouth circuit, the interface circuit (display interface circuit) that RS232 serial interface circuit is communicated as host computer with slave computer.At signal
Reason module further includes dual CAN bus telecommunication circuit, and dual CAN bus telecommunication circuit is for signal processing module and automobile master control system
Communication between system effectively increases the reliability of system communication.
Referring to fig. 2, Fig. 3 and Fig. 7, the arc-shaped capacitance type sensor 4 include a pair of pole plate staggered relatively.It is described
The material of pole plate is metallic copper, and the two poles of the earth plate surface uniform fold green oil is used as insulating materials, two pole plate phase back sides (outside)
The cylinder bracket 5 of four nylon materials (nylon has good corrosion resistance to methanol) is fixed on 3 inner wall of spray bar.It is described
The shape of pole plate is arc-shaped (partial cylindrical surface circumferentially intercepted), is outwardly protruded, and radian is 120 °, the length is
80mm, cambered surface diameter 10mm, with a thickness of 0.5mm, two-plate maximum spacing is the 10mm (capacitance sensing being made of arc pole plate
Device is known as arc-shaped capacitance type sensor, by effectively increasing polar plate area, has better measurement sensitivity).The circular arc
Shape capacitance type sensor 4 is placed in automobile spray bar 3.The section that the automobile spray bar 3 places sensor is to be fabricated separately,
Its internal diameter is 20mm, length 100mm.Each pole plate draws a conducting wire 6, and material is metallic copper, and conductive line surfaces are whole
Cover green oil.
The capacitor model of circular arc electrode is as follows：
In formula, c is capacitance, and ε is the dielectric constant of methanol gasoline, is determined by methanol concentration.As can be seen from the above equation, electric
Capacitance is directly proportional to dielectric constant.
A referring to fig. 4, the capacitance-voltage conversion circuit include oscillator, limiting amplifier and frequency discriminator.The circle
4 two-plate of arc capacitance type sensor is respectively connected to oscillator by conducting wire 6, and the oscillator is connected with limiting amplifier,
The limiting amplifier is connected with frequency discriminator, and the frequency discriminator is connected with Freescale single-chip microcomputer, the Freescale list
Piece machine is connected with RS232 serial interface circuit.The Serial Port Line DB9 and RS232 serial interface that the touch screen passes through a nine kinds of needles
Mouth circuit is connected.The Freescale single-chip microcomputer type selecting is MC9S12XEP100.The RS232 serial interface circuit is selected
As core devices, the periphery MAX232 is received by configuring capacitor C1, C2, C3, C4 of 4 1uF for stablizing transmitting MAX232
Signal.
B referring to fig. 4, by chip 555 and resistance RA、RBAnd circular arc capacitor C (corresponding arc-shaped capacitance type sensor) is constituted
Oscillating circuit.Output waveform cycle T is by RA、RBIt is determined with circular arc capacitor C：
T=0.7* (RA+2RB)*C
In limiting amplifier, impedance inverter circuit is formed by amplifier OP07.
Filter circuit is formed by resistance R1, R2, R6 and capacitor C1, C2, C4, Amplitude Comparison is formed by resistance R3, capacitor C3
Circuit.
Analog voltage signal is exported by 1 foot of LM331.R5, C3 form charging circuit, and R3, R4 form bleeder circuit.
Referring to Fig. 5, the methanol concentration detection device is mounted on automobile, utilizes CAN bus telecommunication circuit and automobile ECU
Turn-key system communication.Since MC9S12XEP100 has 5 tunnel CAN modules, double CAN communications are used in order to improve anti-interference ability
Mode is driven using TJA1050 for CAN, while being configured with 120 ohm of build-out resistor for eliminating end reflection.
The testing principle of above-mentioned methanol concentration detection device is：
In actual measurement, arc-shaped capacitance type sensor 4 is completely submerged in methanol gasoline mixed fuel, while circular arc
Two pole plates of shape capacitance type sensor 4 are linked into the oscillator circuits of capacitance-voltage conversion circuit, referring to fig. 4 a, Fig. 4 b.
After detection device is powered, oscillator can carry out charge and discharge to arc-shaped capacitance type sensor 4 and generate rectilinear oscillation, fuel combination
The concentration of middle methanol is different, then corresponding dielectric constant, capacitor are different, and the frequency of oscillator signal caused by oscillator is not yet
Together.Oscillator signal carries out shaping by the limiting amplifier in capacitance-voltage conversion circuit, and the signal after shaping passes through frequency discriminator
It is converted into voltage signal, this voltage signal is analog signal.Analog voltage signal is sent to Freescale single-chip microcomputer, by flying
Think karr single-chip microcontroller and analog voltage signal is converted into digital signal, calculates methanol concentration according to voltage-concentration formula, and lead to
It crosses RS232 serial interface circuit and is sent to touch screen, touch screen shows methanol concentration information after receiving signal.
In short, structure of the invention design is rationally, function division is clear.Each mutually coordinated cooperation of functional module, can it is accurate,
The methanol concentration in fuel combination is rapidly detected, and concentration information can be displayed in real time.
Claims (9)
1. a kind of methanol concentration detection device, it is characterised in that：The detection device includes measurement module, and the measurement module includes
Capacitance type sensor (4), the capacitance type sensor (4) use arc pole plate.
2. a kind of methanol concentration detection device according to claim 1, it is characterised in that：The arc pole plate includes by metal
Ontology and uniform fold made of copper in the corrosion resistant insulation material layer of the body surface, the insulation material layer with a thickness of
0.05-0.1mm。
3. a kind of methanol concentration detection device according to claim 1, it is characterised in that：Capacitance type sensor (4) packet
Two opposite arc pole plates are included, arc pole plate is the arc surface that radian is 120 °, and cambered surface internal diameter is 10mm, the length of arc pole plate
Degree and thickness are respectively 80mm and 0.5mm, and the maximum spacing of two arc pole plates is 10mm.
4. a kind of methanol concentration detection device according to claim 1, it is characterised in that：The capacitance type sensor (4) sets
It is placed in the spray bar (3) of fuel combination automobile to be measured, the spray bar (3) includes the section for installing arc pole plate, should
The internal diameter of section is 20mm, length 100mm.
5. a kind of methanol concentration detection device according to claim 1, it is characterised in that：The arc pole plate is along the oil spout
Pipe (3) central axis is arranged symmetrically, and passes through nylon mounting bracket (5) between convex side and spray bar (3) inner wall of arc pole plate
It is fixed.
6. a kind of methanol concentration detection device according to claim 1, it is characterised in that：The detection device further includes signal
Processing module and display module, the signal processing module include capacitance-voltage conversion circuit, single-chip microcontroller, display interface circuit
And CAN bus telecommunication circuit；The capacitance-voltage conversion circuit includes the oscillator, limiting amplifier and mirror being sequentially connected
Frequency device, oscillator are connected with the capacitance type sensor (4), frequency discriminator, display interface circuit and CAN bus telecommunication circuit point
It is not connected with single-chip microcontroller, display module includes the touch screen being connected with display interface circuit.
7. a kind of methanol concentration detection method, it is characterised in that：Include the following steps：
1) capacitance type sensor (4) is placed in the spray bar (3) of fuel combination automobile to be measured, capacitance type sensor (4) uses
Arc pole plate；
2) methanol concentration of fuel combination in spray bar (3) is measured using capacitance type sensor (4), by capacitive sensing
The measurement result of device (4) is converted to voltage signal；
3) methanol concentration is calculated according to voltage signal, be then output in the CAN bus of the automobile.
8. a kind of methanol concentration detection method according to claim 7, it is characterised in that：The step 2) specifically includes following
Step：
2.1) methanol concentration of fuel combination is converted to the vibration of respective frequencies first with oscillator and capacitance type sensor (4)
Swing signal；
2.2) shaping is carried out to oscillator signal using limiting amplifier；
2.3) oscillator signal Jing Guo shaping is converted into voltage signal using frequency discriminator.
9. a kind of methanol concentration detection method according to claim 7, it is characterised in that：The step 3) further includes following step
Suddenly：Methanol concentration is shown simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810690391.2A CN108845002A (en) | 2018-06-28 | 2018-06-28 | A kind of methanol gasoline concentration detection apparatus and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810690391.2A CN108845002A (en) | 2018-06-28 | 2018-06-28 | A kind of methanol gasoline concentration detection apparatus and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108845002A true CN108845002A (en) | 2018-11-20 |
Family
ID=64200849
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810690391.2A Pending CN108845002A (en) | 2018-06-28 | 2018-06-28 | A kind of methanol gasoline concentration detection apparatus and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108845002A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3027726A1 (en) * | 1979-07-23 | 1981-01-29 | Nissan Motor | ELECTROSTATIC FUEL MEASURING DEVICE |
| CN1063361A (en) * | 1991-01-11 | 1992-08-05 | 清华大学 | Capacitance-type two-phase flowing observance concentration meter and measuring method thereof |
| CN2129012Y (en) * | 1992-04-09 | 1993-03-31 | 中国人民解放军35401部队67分队 | Speed quality testing instrument for liquid luboil |
| CN201561949U (en) * | 2009-11-25 | 2010-08-25 | 上海华普汽车有限公司 | Fuel ingredient identifying sensor |
| CN102364420A (en) * | 2010-08-24 | 2012-02-29 | 天津大学 | High-precision ECT (Electrical Capacitance Tomography) intelligent sensor |
| CN103234879A (en) * | 2013-03-28 | 2013-08-07 | 重庆大学 | Dust concentration monitoring apparatus based on alternating electric field charge induction and method |
-
2018
- 2018-06-28 CN CN201810690391.2A patent/CN108845002A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3027726A1 (en) * | 1979-07-23 | 1981-01-29 | Nissan Motor | ELECTROSTATIC FUEL MEASURING DEVICE |
| CN1063361A (en) * | 1991-01-11 | 1992-08-05 | 清华大学 | Capacitance-type two-phase flowing observance concentration meter and measuring method thereof |
| CN2129012Y (en) * | 1992-04-09 | 1993-03-31 | 中国人民解放军35401部队67分队 | Speed quality testing instrument for liquid luboil |
| CN201561949U (en) * | 2009-11-25 | 2010-08-25 | 上海华普汽车有限公司 | Fuel ingredient identifying sensor |
| CN102364420A (en) * | 2010-08-24 | 2012-02-29 | 天津大学 | High-precision ECT (Electrical Capacitance Tomography) intelligent sensor |
| CN103234879A (en) * | 2013-03-28 | 2013-08-07 | 重庆大学 | Dust concentration monitoring apparatus based on alternating electric field charge induction and method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102594327B (en) | Capacitive sensing key and key detection method | |
| CN103900661B (en) | Segmented liquid level sensor based on capacitance-to-digital conversion technology | |
| CN106324048B (en) | A kind of soil humidity sensor and its working method based on oscillation circuit | |
| CN102589644B (en) | Capacitance type liquid level sensor | |
| CN101551264B (en) | Capacitance electronic type fuel sensor | |
| CN108845002A (en) | A kind of methanol gasoline concentration detection apparatus and method | |
| CN102980630B (en) | A kind of intelligent digital capacitive liquid level sensor | |
| CN103064049A (en) | Three-dimensional standard magnetic field generating device based on phase synchronization | |
| CN104897239A (en) | Non-contact liquid level sensor and intelligent water cup comprising the same | |
| CN206178042U (en) | Non -contact fluid impedance measurement device based on virtual inductance technique that is in harmonious proportion is separated to numeral phase sensitivity | |
| CN108051485A (en) | Soil moisture measurement method and soil moisture sensor | |
| CN202548139U (en) | Handheld universal rotating speed measuring instrument of automobile engine | |
| CN201740566U (en) | Water level detection device of water heater | |
| CN207717584U (en) | A kind of heat-resistance type high sensitivity condenser type carbon dust PM rapid measurement devices | |
| CN109238401A (en) | Liquid level detection device and method | |
| CN201859000U (en) | Capacitive liquid level transmitter | |
| CN202837318U (en) | Engine rotating speed measuring device based on magnetic encoder | |
| CN103399189B (en) | A kind of Multifunction AC circuit parameter testing and characteristic demonstration device | |
| CN109297563A (en) | One kind being used for small space hydraulic oil measurement method and its device | |
| CN107037267A (en) | A kind of inductance detection device and detection method | |
| CN1100387C (en) | CMOS capacitor type proximity switch | |
| CN201237577Y (en) | LC oscillation form industrial metal detector using period detection | |
| CN203396451U (en) | Automobile oil level monitoring device | |
| CN105466606B (en) | A kind of ultrasonic calorimeter blank pipe detecting system and method | |
| CN2484572Y (en) | Capacitance-date collection sensor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20181120 |