Mixed fuel identification device and methanol engine

Abstract

The invention provides a mixed fuel recognition device and a methanol engine. The mixed fuel recognition device comprises a fuel channel, a mainboard, a capacitor, a temperature sensor, an acoustic transmitter and an acoustic receiver. The fuel channel is used for mixed fuel to flow through; the capacitor is arranged in the fuel channel and is in communication connection with the mainboard so as to measure the dielectric constant of the mixed fuel in the fuel channel; the temperature sensor is in communication connection with the main board and is used for measuring the temperature of the mixed fuel in the fuel channel; the sound emitter is in communication connection with the main board and is used for emitting sound pulses to the mixed fuel in the fuel channel; the sound receiver is in communication connection with the main board, and the sound receiver is used for receiving sound pulses and transmitting pulse electric signals to the main board; wherein the mainboard determines the methanol concentration of the mixed fuel based on the measured dielectric constant, temperature and pulse electric signal of the mixed fuel. The problem of how to improve the measurement precision of the methanol engine on the methanol concentration in the mixed fuel in the prior art is solved.

Description

Technical Field

[0001] The present application relates to the field of engine technology, and in particular to a mixed fuel identification device and a methanol engine. Background Art

[0002] In engine-related technologies, the use of methanol as an alternative fuel has become a research and development direction in the field. Considering that there are currently few methanol filling stations and it is inconvenient to fill methanol, methanol engines that use a mixture of methanol and gasoline as fuel have been developed in the prior art, so that vehicles can use methanol and gasoline as fuel in any proportion.

[0003] When a methanol engine uses a mixed fuel with methanol and gasoline as components, due to the difference between the chemical equivalent air-fuel ratio of gasoline and the chemical equivalent air-fuel ratio of alcohols, the engine control module needs to obtain the concentration of methanol in the fuel, and thus control the fuel pump and fuel injector to supply different volumes of fuel according to the different concentrations of methanol in the fuel, which is conducive to the complete combustion of the fuel and the methanol engine to exert its efficiency and performance.

[0004] Therefore, how to improve the measurement accuracy of the methanol concentration in the mixed fuel by the methanol engine has become an important technical problem to be solved by those skilled in the art. Summary of the invention

[0005] In view of this, the present application provides a mixed fuel identification device and a methanol engine to solve the problem in the prior art of how to improve the measurement accuracy of the methanol concentration in the mixed fuel by the methanol engine.

[0006] In order to achieve the above objectives, this application provides the following technical solutions:

[0007] A mixed fuel identification device, comprising:

[0008] a fuel passage for allowing the mixed fuel to flow through;

[0009] Motherboard;

[0010] a capacitor disposed in the fuel channel, the capacitor being communicatively connected to the main board to measure a dielectric constant of the mixed fuel in the fuel channel;

[0011] a temperature sensor, connected to the main board for measuring the temperature of the mixed fuel in the fuel channel;

[0012] an acoustic transmitter, communicatively connected to the main board and used to emit acoustic pulses to the mixed fuel in the fuel channel;

[0013] An acoustic receiver, connected to the main board for communication, and configured to receive the sound pulses and transmit pulse electrical signals to the main board;

[0014] Wherein, the main board determines the methanol concentration of the mixed fuel based on the measured dielectric constant, the temperature and the pulse electrical signal of the mixed fuel.

[0015] Optionally, the capacitor comprises:

[0016] A first electrode plate, arranged on the inner wall of the fuel channel;

[0017] The second electrode plate is arranged on the inner wall of the fuel channel, and the first electrode plate and the second electrode plate are arranged opposite to each other with respect to the center line of the fuel channel and have opposite polarities.

[0018] Optionally, both the first electrode plate and the second electrode plate are arc-shaped plates and are closely connected to the inner wall of the fuel channel.

[0019] Optionally, the central angles of the first electrode plate and the second electrode plate are both 120°-150°.

[0020] Optionally, surfaces of the first electrode plate and the second electrode plate are both provided with a platinum black coating.

[0021] Optionally, the fuel channel is constructed of an insulating tube, the first pole plate and the second pole plate are both metal parts, and the first pole plate and the second pole plate are both integrally formed with the insulating tube by injection molding.

[0022] Optionally, a first mounting hole for mounting the temperature sensor is provided on the first electrode plate, and the first mounting hole is communicated with the fuel channel;

[0023] A second mounting hole for mounting the sound transmitter is formed on one of the first electrode plate and the second electrode plate, and a third mounting hole for mounting the sound receiver is formed on the other electrode plate, and both the second mounting hole and the third mounting hole are connected to the fuel channel.

[0024] Optionally, a mounting seat is provided on the side of the first electrode plate and the second electrode plate facing away from the fuel channel, and the first mounting hole, the second mounting hole and the third mounting hole are all located in the corresponding mounting seat.

[0025] Optionally, the fuel channel is constructed by an insulating tube, the inner wall of the insulating tube is formed with a first mounting groove and a second mounting groove, the first electrode plate is consistent with the first mounting groove, and the second electrode plate is consistent with the second mounting groove;

[0026] The insulating tube is formed with a matching hole that matches the mounting seat, and the matching hole allows the mounting seat to be exposed on the outer wall of the insulating tube.

[0027] Optionally, the mounting bases of the first electrode plate and the second electrode plate are both provided with wiring pins.

[0028] Optionally, it further includes a shell, in which an insulating tube constituting the fuel channel is passed through, and the main board is encapsulated in the shell.

[0029] A methanol engine comprises any one of the mixed fuel identification devices mentioned above.

[0030] The mixed fuel identification device provided in the present application includes a fuel channel, a main board, a capacitor, a temperature sensor, an acoustic transmitter and an acoustic receiver; the fuel channel is used for allowing the mixed fuel to flow through; the capacitor is arranged in the fuel channel, and the capacitor is communicatively connected to the main board to measure the dielectric constant of the mixed fuel in the fuel channel; the temperature sensor is communicatively connected to the main board and is used to measure the temperature of the mixed fuel in the fuel channel; the acoustic transmitter is communicatively connected to the main board and is used to transmit sound pulses to the mixed fuel in the fuel channel; the acoustic receiver is communicatively connected to the main board, and the acoustic receiver is used to receive the sound pulses and transmit pulse electrical signals to the main board; wherein the main board determines the methanol concentration of the mixed fuel based on the measured dielectric constant, temperature and pulse electrical signal of the mixed fuel. In this way, the basic fact that the dielectric constants of methanol and gasoline are quite different is used as the design basis. The present application takes into account that impurities and additives are inevitable in the actual mixed fuel of methanol and gasoline, so the influence of impurities and additives on the measurement result of the dielectric constant is inevitable. Therefore, the mixed fuel identification device provided by the present application measures the dielectric constant by the capacitance method, and is assisted by the temperature sensor, the sound transmitter and the sound receiver. Among them, due to the characteristics of sound propagation and the short-distance propagation scenario in the fuel channel, the propagation of sound in the mixed fuel is basically negligible by the influence of impurities and additives, so the sound speed is only affected by the solution density of the mixed fuel and is a function of the bulk elastic modulus of the fuel. Therefore, the main board can measure the sound speed through the pulse electrical signal, and the sound speed indirectly reflects the methanol concentration, thereby correcting the methanol concentration of the mixed fuel and improving the measurement accuracy of the methanol concentration. It not only makes up for the poor accuracy caused by impurities and additives, but also effectively makes up for the poor accuracy caused by low ambient temperature and fuel stratification, solving the problem of how to improve the measurement accuracy of the methanol concentration in the mixed fuel by the methanol engine in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0032] Figure 1 A schematic diagram of the explosion structure of the mixed fuel identification device provided in an embodiment of the present application;

[0033] Figure 2 for Figure 1 Sectional view at A in the middle;

[0034] Figure 3 A cross-sectional view of a fuel channel provided in an embodiment of the present application;

[0035] Figure 4 A cross-sectional view of a first electrode plate provided in an embodiment of the present application;

[0036] Figure 5 A cross-sectional view of a second electrode plate provided in an embodiment of the present application;

[0037] Figure 6 A schematic diagram of the central angle α of the first electrode plate and the second electrode plate provided in an embodiment of the present application;

[0038] Figure 7 A diagram showing the working principle of the mixed fuel identification device provided in an embodiment of the present application.

[0039] exist Figure 1-Figure 6 middle:

[0040] 1. Fuel channel; 2. Main board; 3. First plate; 4. Second plate; 5. Temperature sensor; 6. Sound transmitter; 7. Sound receiver; 8. Mounting seat; 9. Wiring pins; 10. Open box; 11. Cover plate; 12. Platinum black coating;

[0041] 101. first mounting groove; 102. second mounting groove; 103. matching hole;

[0042] 301, first mounting hole; 302, second mounting hole;

[0043] 401. A third mounting hole. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0045] like Figure 1-Figure 7As shown, an embodiment of the present application provides a mixed fuel identification device, which is used in a vehicle engine. The mixed fuel identification device includes a fuel channel 1, a main board 2, a capacitor, a temperature sensor 5, an acoustic transmitter 6 and an acoustic receiver 7; the main board 2 is also called a PCB board; the fuel channel 1 is used for the mixed fuel to flow through, and the mixed fuel is a liquid; the capacitor is arranged in the fuel channel 1, and the capacitor is communicatively connected to the main board 2 to measure the dielectric constant of the mixed fuel in the fuel channel 1; the temperature sensor 5 is communicatively connected to the main board 2, at least the probe part of the temperature sensor 5 is exposed in the fuel channel 1, and is used to measure the temperature of the mixed fuel in the fuel channel 1; the acoustic transmitter 6 is communicatively connected to the main board 2, at least the transmitting head of the acoustic transmitter 6 is exposed in the fuel channel 1, and is used to transmit sound pulses to the mixed fuel in the fuel channel 1; the acoustic receiver 7 is communicatively connected to the main board 2, at least the receiving head of the acoustic receiver 7 is exposed in the fuel channel 1, and the acoustic receiver 7 is used to receive the sound pulse and transmit the pulse electrical signal to the main board 2; wherein the main board 2 determines the methanol concentration of the mixed fuel based on the measured dielectric constant, temperature and pulse electrical signal of the mixed fuel.

[0046] In this way, the basic fact that the dielectric constants of methanol and gasoline are quite different is used as the design basis. The present application takes into account that impurities and additives are inevitable in the actual mixed fuel of methanol and gasoline, so the influence of impurities and additives on the measurement result of the dielectric constant is inevitable. Therefore, the mixed fuel identification device provided by the present application measures the dielectric constant by the capacitance method, and is assisted by the temperature sensor 5, the sound transmitter 6 and the sound receiver 7. Among them, due to the characteristics of sound propagation and the short-distance propagation scenario in the fuel channel 1, the propagation of sound in the mixed fuel is basically negligible by the influence of impurities and additives, so the sound velocity is only affected by the solution density of the mixed fuel and is a function of the bulk elastic modulus of the fuel. Therefore, the main board 2 can measure the sound velocity through the pulse electrical signal, and the sound velocity indirectly reflects the methanol concentration, thereby correcting the methanol concentration of the mixed fuel and improving the measurement accuracy of the methanol concentration, which not only makes up for the poor accuracy caused by impurities and additives, but also effectively makes up for the poor accuracy caused by low ambient temperature and fuel stratification, solving the problem of how to improve the measurement accuracy of the methanol concentration in the mixed fuel by the methanol engine in the prior art.

[0047] More specifically, regarding the working principle of the mixed fuel identification device provided in this application, please refer to Figure 7 , make the following explanation: Figure 1As shown, a mixed fuel composed of methanol and gasoline passes through a fuel channel 1 of a mixed fuel identification device. When the mixed fuel flows through the fuel channel 1, it passes through a capacitor. The capacitor detects the capacitance of the mixed fuel. The main board 2 calculates the dielectric constant. At the same time, since the dielectric constants of methanol and gasoline change due to temperature changes, the temperature of the mixed fuel is measured by a temperature sensor 5 to compensate for the dielectric constant. Moreover, the acoustic transmitter 6 sends a sound pulse to the mixed fuel in the fuel channel 1, and the acoustic receiver 7 receives the pulse signal. Since the transmission and reception intervals are known, the speed of sound can be accurately calculated through the pulse electrical signal. It has been found through known research that the speed of sound in a liquid is related to the density of the solution and is a function of the bulk elastic modulus of the fuel. Since the propagation speed of sound in methanol mixtures of different concentrations is different, the methanol concentration can be indirectly reflected through the speed of sound. The main board 2 obtains the methanol concentration of the mixed fuel based on the compensated dielectric constant, and combines the methanol concentration correction obtained by measuring the speed of sound to obtain the final methanol concentration in the mixed fuel. The main board 2 calculates a methanol concentration MAP diagram and feeds it back to the engine control module (also called ECU). In this way, the engine control module can control the fuel pump and fuel injector to supply different volumes of fuel according to the methanol concentration in the current mixed fuel, that is, the mixing ratio of methanol to gasoline, which is conducive to the complete combustion of the fuel and the efficiency and performance of the methanol engine.

[0048] It should be noted that the acoustic transmitter 6 and the acoustic receiver 7 are both existing conventional electrical components, wherein the acoustic transmitter 6 may also be referred to as a crystal transmitter. The mainboard 2 performs the determination of the dielectric constant based on the capacitor and compensates for the dielectric constant based on the temperature measured by the temperature sensor 5, which are both technologies known to those skilled in the art, and will not be described in detail here. Reference may be made to the disclosed CN116696568A (mixed fuel ratio measurement sensor, measurement method, engine system and vehicle). In addition, for those skilled in the art, in terms of the correlation between the speed of sound in the liquid and the density of the solution, the methanol concentration in the mixed fuel is obtained by the sound velocity measurement value, which is obtained based on the existing and available relationship diagram between the mixing ratio of methanol and gasoline and the propagation speed of sound therein, and is an existing data model, so it will not be described in detail herein.

[0049] It should be noted that the cross section of the fuel channel 1 can be circular, elliptical, polygonal, etc.

[0050] In some optional embodiments, the two electrode bodies of the capacitor are in the form of plate-like bodies, and the capacitor includes a first electrode plate 3 and a second electrode plate 4, the first electrode plate 3 is arranged on the inner wall of the fuel channel 1; the second electrode plate 4 is arranged on the inner wall of the fuel channel 1, the first electrode plate 3 and the second electrode plate 4 are arranged relative and symmetrically about the center line of the fuel channel 1, and the polarities of the first electrode plate 3 and the second electrode plate 4 are opposite, that is, one of the first electrode plate 3 and the second electrode plate 4 is a cathode electrode plate, and the other is an anode electrode plate. The first electrode plate 3 and the second electrode plate 4 are both connected to the main board 2 for communication.

[0051] In this arrangement, the first electrode plate 3 and the second electrode plate 4 occupy a local area of ​​the inner wall of the fuel channel 1, the plate-shaped electrode body is easy to produce and connect with the fuel channel 1, and the manufacturing process is easy; moreover, the space between the first electrode plate 3 and the second electrode plate 4 is consistent with the sufficient passing area provided by the fuel channel 1 for the mixed fuel, and will not cause obstruction and disturbance to the flow of the mixed fuel, thereby ensuring measurement accuracy.

[0052] In addition, it is also feasible to set the capacitor as a concentrically arranged cathode tube and anode tube with different diameters, distribute the cathode tube and anode tube inside and outside, and pass the mixed fuel through the annular space between the cathode tube and the anode tube for measurement.

[0053] Since the fuel channel 1 is usually configured as a channel with a circular cross-section, in some optional embodiments, it is preferred that the first electrode plate 3 and the second electrode plate 4 are both arc-shaped plates, that is, the cross-section is arc-shaped, and the first electrode plate 3 and the second electrode plate 4 are both fitted and connected to the inner wall of the fuel channel 1.

[0054] With such arrangement, the arc-shaped first electrode plate 3 and the second electrode plate 4 are easy to cooperate with the circular fuel channel 1, and the fitting connection arrangement has the advantages of large contact area and stable connection, which is helpful to assist in ensuring the measurement accuracy of the capacitor.

[0055] In addition, the first electrode plate 3 and the second electrode plate 4 can also be configured to have a cross section of an elliptical arc or a multi-segment arc; in addition, when the fuel channel 1 is a square channel, it is also feasible to configure the first electrode plate 3 and the second electrode plate 4 as straight plates.

[0056] Further, in some specific embodiments, the central angle α of the first electrode plate 3 and the second electrode plate 4 is 120°-150°, including the endpoint values ​​at both ends, that is, the central angle corresponding to the arc of the cross section of the first electrode plate 3 and the second electrode plate 4.

[0057] With such arrangement, after tests and verification, if the central angle of the first electrode plate 3 and the second electrode plate 4 is smaller than the above-mentioned angle range, the area of ​​the first electrode plate 3 and the second electrode plate 4 contacting the mixed fuel will be too small, which is not conducive to measurement, and will cause inconvenience in the tooling to take and install the first electrode plate 3 and the second electrode plate 4; if the central angle of the first electrode plate 3 and the second electrode plate 4 is larger than the above-mentioned angle range, the distance between the first electrode plate 3 and the second electrode plate 4 is too close and there is a risk of short circuit; therefore, setting the central angle of the first electrode plate 3 and the second electrode plate 4 to the above-mentioned angle range is the result of multiple tests and adjustments and comprehensive selection of multiple factors, and has implementation advantages in many aspects.

[0058] In some other preferred embodiments, the two electrode bodies of the capacitor are provided with a platinum black coating 12. Specifically, the first electrode plate 3 and the second electrode plate 4 are both metal parts, which can be but not limited to stainless steel, and the surfaces of the first electrode plate 3 and the second electrode plate 4 are provided with a platinum black coating 12. Specifically, platinum metal is plated on the surfaces of the first electrode plate 3 and the second electrode plate 4 by an electrochemical deposition method, and then the platinum is converted into platinum black by a high temperature treatment method.

[0059] With such a configuration, the present application takes into account that, on the one hand, the electrical conductivity of the solution will accelerate the dissolution of the metal material surface of the first electrode plate 3 and the second electrode plate 4, causing corrosion and peeling; on the other hand, the first electrode plate 3 and the second electrode plate 4 are in the solution, and the action of the electric field involved in the working process will lead to a polarization effect, and charges will accumulate on the surfaces of the first electrode plate 3 and the second electrode plate 4. Impurities will increase the electrical conductivity of the solution and affect the measurement accuracy; and through the design of the platinum black coating 12, the corrosion resistance and stability of the first electrode plate 3 and the second electrode plate 4 are improved, the influence of the conductivity change caused by the solution impurities on the capacitance test is reduced, and the test accuracy of the mixed fuel identification device is improved.

[0060] In some other preferred embodiments, the fuel channel 1 is constructed of an insulating tube, the inner cavity of the insulating tube is the fuel channel 1, the insulating tube is a methanol-resistant insulating material, the first pole plate 3 and the second pole plate 4 are both metal parts, and the first pole plate 3 and the second pole plate 4 are both integrally molded with the insulating tube by injection molding to form an embedded structure.

[0061] With such arrangement, when the insulating tube is formed by injection molding, the first electrode plate 3 and the second electrode plate 4 are fixed to the inner wall of the insulating tube by using a mold and one-piece molding technology, and the first electrode plate 3 and the second electrode plate 4 are tightly connected to the fuel channel 1 by injection molding; moreover, the assembly consistency of the first electrode plate 3 and the second electrode plate 4 can be ensured by manufacturing the tooling mold, thereby helping to improve the test accuracy; furthermore, in this manner, in conjunction with the implementation method in which the first electrode plate 3 and the second electrode plate 4 are arranged in an arc shape, the first electrode plate 3 and the second electrode plate 4 are tightly attached to the inner wall of the fuel channel.

[0062] In the above embodiment, compared with the capacitor in the form of pole tubes distributed inside and outside, the assembly process of the first pole plate 3 and the second pole plate 4 is simple, the consistency is good, and the durability and reliability are improved; at the same time, the first pole plate 3 and the second pole plate 4 are injection molded as one with the fuel channel, avoiding the sealing problem caused by the packaging of the pole tubes distributed inside and outside; moreover, it also avoids the oil blocking and oil disturbance defects caused by the fuel passing through the annular area between the pole tubes, thereby avoiding measurement fluctuations.

[0063] In some specific embodiments, a first mounting hole 301 for mounting the temperature sensor 5 is provided on the first electrode plate 3, and the first mounting hole 301 is communicated with the fuel channel 1, that is, the first mounting hole 301 radially penetrates the first electrode plate 3; a second mounting hole 302 for mounting the sound transmitter 6 is provided on one of the first electrode plate 3 and the second electrode plate 4, and a third mounting hole 401 for mounting the sound receiver 7 is provided on the other, and the second mounting hole 302 and the third mounting hole 401 are both communicated with the fuel channel 1, that is, the second mounting hole 302 and the third mounting hole 401 radially penetrate the corresponding first electrode plate 3 or the second electrode plate 4. It should be noted that when the temperature sensor 5, the sound transmitter 6 and the sound receiver 7 are installed and connected, they can be threadedly connected with the first electrode plate 3 or the second electrode plate 4, and the first mounting hole 301, the second mounting hole 302 and the third mounting hole 401 are sealed by corrosion-resistant O-rings.

[0064] With such arrangement, since the first electrode plate 3 and the second electrode plate 4 originally need to be machined, the mounting holes for the temperature sensor 5, the sound transmitter 6 and the sound receiver 7 can be machined on the first electrode plate 3 and the second electrode plate 4 at one time, thereby reducing the number of machining steps.

[0065] Exemplarily, the temperature sensor 5 is installed in the first installation hole 301 of the cathode plate; the sound transmitter 6 is installed in the second installation hole 302 of the cathode plate, and the sound receiver 7 is installed in the third installation hole 401 of the anode plate.

[0066] In some other preferred embodiments, a mounting seat 8 is provided on the side of the first electrode plate 3 and the second electrode plate 4 facing away from the fuel channel 1, and the first mounting hole 301, the second mounting hole 302 and the third mounting hole 401 are all located in the corresponding mounting seat 8. The mounting seat 8 and the electrode plate itself are made of the same material. In this way, since the first electrode plate 3 and the second electrode plate 4 are both relatively thin, the length and installation space of the first mounting hole 301, the second mounting hole 302 and the third mounting hole 401 are lengthened by the provision of the mounting seat 8, which is beneficial to the stability of the installation of the temperature sensor 5, the sound transmitter 6 and the sound receiver 7.

[0067] In some other specific embodiments, the fuel channel 1 is constructed of an insulating tube, and the inner wall of the insulating tube is formed with a first mounting groove 101 and a second mounting groove 102, the first pole plate 3 is consistent with the first mounting groove 101, and the second pole plate 4 is consistent with the second mounting groove 102; the insulating tube is formed with a matching hole 103 that is consistent with the mounting seat 8, and the matching hole 103 allows the mounting seat 8 to be exposed on the outer wall of the insulating tube.

[0068] In this way, the design of the first mounting groove 101 and the second mounting groove 102 is conducive to ensuring that the first electrode 3 and the second electrode 4 are embedded in the inner wall of the insulating tube; the matching hole 103 reserved in the insulating tube is for the mounting seat 8 to extend out, so that the wires of the temperature sensor 5, the sound transmitter 6 and the sound receiver 7 are electrically connected to the mainboard 2.

[0069] In some specific embodiments, the mounting bases 8 of the first electrode plate 3 and the second electrode plate 4 are both provided with connection pins 9, which can also be called connection hooks, so that the first electrode plate 3 and the second electrode plate 4 are electrically connected to the mainboard 2 through the connection pins 9 to transmit the test signal to the mainboard 2.

[0070] In some other preferred embodiments, the mixed fuel identification device further includes a housing, the insulating tube constituting the fuel channel 1 is passed through the housing, and the main board 2 is encapsulated in the housing. Specifically, the housing includes an open box body 10 and a cover plate 11 sealed on the open box body 10, and the open box body 10 and the cover plate 11 are detachably connected, which can be but not limited to a snap connection or a fastener connection, for easy maintenance; the main board 2 can be arranged in parallel with the cover plate 11.

[0071] Based on the above-mentioned mixed fuel identification device, the embodiment of the present application further provides a methanol engine, which includes the above-mentioned mixed fuel identification device, and the main board 2 is communicatively connected with the engine control module. Since the methanol engine has the above-mentioned mixed fuel identification device, the beneficial effects of the mixed fuel identification device on the methanol engine can be seen in the above content, which will not be repeated here.

[0072] The basic principles of the present application are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present application. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, not for limitation, and the above details do not limit the present application to being implemented by adopting the above specific details.

[0073] The block diagrams of the devices, apparatuses, equipment, and systems involved in this application are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagram. As will be appreciated by those skilled in the art, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open words, referring to "including but not limited to", and can be used interchangeably with them. The words "or" and "and" used here refer to the words "and / or" and can be used interchangeably with them, unless the context clearly indicates otherwise. The words "such as" used here refer to the phrase "such as but not limited to", and can be used interchangeably with them.

[0074] It should also be noted that in the apparatus, device and method of the present application, each component or each step can be decomposed and / or recombined. Such decomposition and / or recombination should be regarded as equivalent solutions of the present application.

[0075] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

[0076] It should be understood that the qualifiers "first", "second", "third", "fourth", "fifth" and "sixth" used in the description of the embodiments of the present application are only used to more clearly explain the technical solutions and cannot be used to limit the scope of protection of the present application.

[0077] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. A mixed fuel identification device, characterized in that: include: A fuel channel (1) for allowing the mixed fuel to flow through; Mainboard (2); A capacitor is arranged in the fuel channel (1), the capacitor being in communication connection with the main board (2) to measure the dielectric constant of the mixed fuel in the fuel channel (1); a temperature sensor (5) connected to the main board (2) and used to measure the temperature of the mixed fuel in the fuel channel (1); an acoustic transmitter (6) which is in communication with the main board (2) and is used to transmit acoustic pulses to the mixed fuel in the fuel channel (1); an acoustic receiver (7) connected to the main board (2) for receiving the sound pulses and transmitting pulse electrical signals to the main board (2); Wherein, the main board (2) determines the methanol concentration of the mixed fuel based on the measured dielectric constant, temperature and pulse electrical signal of the mixed fuel.

2. The mixed fuel identification device according to claim 1, characterized in that: The capacitor comprises: A first electrode plate (3) arranged on the inner wall of the fuel channel (1); The second electrode plate (4) is arranged on the inner wall of the fuel channel (1); the first electrode plate (3) and the second electrode plate (4) are arranged opposite to each other with respect to the center line of the fuel channel (1) and have opposite polarities.

3. The mixed fuel identification device according to claim 2, characterized in that: The first electrode plate (3) and the second electrode plate (4) are both arc-shaped plates and are closely connected to the inner wall of the fuel channel (1).

4. The mixed fuel identification device according to claim 3, characterized in that: The center angles of the first electrode plate (3) and the second electrode plate (4) are both 120°-150°.

5. The mixed fuel identification device according to claim 2, characterized in that: The surfaces of the first pole plate (3) and the second pole plate (4) are both provided with a platinum black coating (12).

6. The mixed fuel identification device according to claim 2, characterized in that: The fuel channel (1) is constructed of an insulating tube, the first pole plate (3) and the second pole plate (4) are both metal parts, and the first pole plate (3) and the second pole plate (4) are integrally formed with the insulating tube by injection molding.

7. The mixed fuel identification device according to claim 2, characterized in that: The first electrode plate (3) is provided with a first mounting hole (301) for mounting the temperature sensor (5), and the first mounting hole (301) is connected to the fuel channel (1); A second mounting hole (302) for mounting the sound transmitter (6) is provided on one of the first electrode plate (3) and the second electrode plate (4), and a third mounting hole (401) for mounting the sound receiver (7) is provided on the other electrode plate; the second mounting hole (302) and the third mounting hole (401) are both connected to the fuel channel (1).

8. The mixed fuel identification device according to claim 7, characterized in that: A mounting seat (8) is provided on the side of the first pole plate (3) and the second pole plate (4) facing away from the fuel channel (1), and the first mounting hole (301), the second mounting hole (302) and the third mounting hole (401) are all located in the corresponding mounting seat (8).

9. The mixed fuel identification device according to claim 8, characterized in that: The fuel channel (1) is constructed of an insulating tube, the inner wall of the insulating tube is formed with a first mounting groove (101) and a second mounting groove (102), the first electrode plate (3) is matched with the first mounting groove (101), and the second electrode plate (4) is matched with the second mounting groove (102); The insulating tube is formed with a matching hole (103) that matches the mounting seat (8), and the matching hole (103) allows the mounting seat (8) to be exposed on the outer wall of the insulating tube.

10. The mixed fuel identification device according to claim 8, characterized in that: The mounting seats (8) of the first pole plate (3) and the second pole plate (4) are both provided with connection pins (9).

11. The mixed fuel identification device according to claim 1, characterized in that: It also comprises a shell, in which an insulating tube constituting the fuel channel (1) is passed, and in which the main board (2) is encapsulated.

12. A methanol engine, characterized in that: It comprises a mixed fuel identification device as described in any one of claims 1-11.

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