Detection device, vehicle and detection method

Abstract

The embodiment of the invention discloses a detection device, a vehicle and a detection method. The detection device comprises a probe and a signal processing module. The probe comprises a probe rod and a plurality of mutually insulated electrodes, the signal processing module is respectively connected with the plurality of electrodes, and the signal processing module outputs an excitation signal to at least one sending electrode in the plurality of electrodes after the probe rod is inserted into the container containing the liquid; the detection signals of the receiving electrodes corresponding to the sending electrodes loaded with the excitation signals in the multiple electrodes are collected, and then the parameters of the liquid can be determined according to the excitation signals and the detection signals collected from the receiving electrodes. According to the arrangement, the detection device with a simple structure can be adopted to detect parameters of liquid, and the effects of high detection speed, objective and accurate result and high reliability are achieved.

Description

Technical Field

[0001] The present application relates to the field of vehicle-mounted technology, and in particular to a detection device, a vehicle and a detection method. Background Art

[0002] Motor oil, also known as engine lubricant, is an important element for the normal operation of automobile engines. It can lubricate and reduce friction, assist in cooling and temperature reduction, seal and prevent leakage, prevent rust and corrosion, and reduce shock and buffer. During the normal use and operation of the engine, the motor oil will experience normal consumption and deterioration. If there is too little motor oil in the engine, the lubrication, friction reduction, shock absorption and buffering effects of the motor oil will be weakened, and the engine wear will increase, carbon deposits will increase, and the engine life and performance will be shortened. If the motor oil deteriorates, the viscosity of the motor oil will increase, and the various properties of the motor oil will be weakened. It will not be able to play the role of lubrication and cleaning normally, which will also affect the service life and performance of the engine. Therefore, how to conveniently detect parameters such as the liquid level and degree of deterioration of the motor oil has become an urgent problem to be solved. Summary of the invention

[0003] The embodiments of the present application provide a detection device, a vehicle and a detection method for conveniently detecting parameters of relevant liquids.

[0004] In the first aspect, an embodiment of the present application provides a detection device, which includes: a probe and a signal processing module. The probe includes: a probe rod and a plurality of electrodes insulated from each other, the plurality of electrodes are respectively arranged on the outer wall of the probe rod, and the plurality of electrodes are arranged at intervals along the extension direction of the probe rod. The signal processing module is respectively connected to the plurality of electrodes to realize signal transmission between each electrode. Moreover, by making the plurality of electrodes include at least one transmitting electrode and at least one receiving electrode, at least one transmitting electrode corresponds to at least one receiving electrode one by one, and the signal processing module is used to load an excitation signal to at least one of the transmitting electrodes after the probe rod is inserted into a container for liquid, and collect the detection signal of the receiving electrode corresponding to the transmitting electrode loaded with the excitation signal, and then according to the excitation signal and the detection signal collected from each receiving electrode, the parameters of the liquid can be determined. With this arrangement, a detection device with a simple structure can be used to detect the parameters of the liquid, and the detection speed is fast, the results are objective and accurate, and the reliability is high.

[0005] The detection device provided in the embodiment of the present application can detect the parameters of various liquids. Exemplarily, the detection device provided in the embodiment of the present application can be arranged in a vehicle as a vehicle-mounted detection device. Among them, the detection device can be directly fixedly arranged in certain parts of the vehicle to detect the liquid (such as engine oil) in the vehicle. Of course, the detection device can also be placed in the storage box of the vehicle. When the liquid needs to be detected, the operator can take the detection device out of the storage box and insert the probe of the detection device into the liquid for detection. At this time, the liquid detected by the detection device can be a liquid in the vehicle, such as engine oil. Alternatively, the liquid detected by the detection device can also be an industrial liquid in the industrial field.

[0006] The excitation signal in the present application may be an AC excitation signal. For example, the excitation signal u0 may be a specific amplitude U0 and a specific phase (You can ), an AC excitation signal of a specific frequency f, and the excitation signal u0 can be expressed as: u0=U0sin(2πft).

[0007] Correspondingly, the detection signal in the present application may also be an AC signal, for example, the detection signal u s The amplitude U s , Phase (You can ), an AC detection signal of frequency f, and the detection signal u s It can be expressed as:

[0008] When setting the width of the electrodes, the width of each electrode can be made the same, thereby reducing the difficulty of process preparation and improving detection accuracy.

[0009] When setting the width of the gap between two adjacent electrodes, the width of the gap between the two adjacent electrodes can be made the same, thereby reducing the difficulty of process preparation and improving the detection accuracy.

[0010] By making the probe rod include: a detection part and a port part, wherein the port part can be clamped on the outside of the container, the probe rod can be fixedly arranged to reduce shaking. In addition, by making the multiple electrodes respectively arranged on the outer wall of the detection part, and one end of the detection part is fixedly connected to the port part, and the other end of the detection part is inserted into the liquid, the liquid parameters can be detected. Exemplarily, the container will be provided with a liquid inlet, through which the solution is poured in and out, and the port part can be clamped at the liquid inlet of the container.

[0011] In the present application, the detection part can be set as a hollow tubular structure, that is, the detection part has a storage space inside, which is not solid, and the end of the detection part inserted into the liquid is a closed structure, so as to prevent the liquid from entering the detection part. Based on this, a plurality of electrode wirings insulated from each other can be set on the inner wall of the tubular structure, and the plurality of electrode wirings are respectively connected to the signal processing module. In addition, the plurality of electrode wirings correspond one-to-one with the plurality of electrodes, and the electrode wirings are connected to the corresponding electrodes through the first vias that penetrate the detection part, so as to realize the signal transmission between the signal processing module and the electrodes.

[0012] In the present application, the probe and the signal processing module can be integrated together. Alternatively, the probe and the signal processing module can be connected by a cable. Then the port portion can have multiple wiring connection ports, and the multiple wiring connection ports correspond to the multiple electrode wirings one by one, and the electrode wirings are connected to the corresponding wiring connection ports through the second vias that pass through the port portion. The detection device is also provided with a cable, and the multiple wiring connection ports are connected to the signal processing module through the cable.

[0013] In the present application, one or more determination methods may be used to determine the parameters of the liquid. For example, determining the parameters of the liquid based on the excitation signal and the detection signal collected from each receiving electrode may include: determining the conductivity corresponding to each receiving electrode based on the excitation signal and the detection signal collected from each receiving electrode, where the conductivity is the conductivity of the material in the area between the corresponding receiving electrode and the transmitting electrode. And, determining the parameters of the liquid based on the conductivity corresponding to each receiving electrode.

[0014] Since the conductivity of the liquid is different from that of the air, the liquid level and / or the degree of degradation of the liquid can be represented by the conductivity. Then, the parameters determined by the signal processing module may include: the liquid level relative to the bottom of the container and / or the degree of degradation of the liquid.

[0015] In the present application, one or more determination methods may be used to determine the liquid level according to the conductivity. For example, the liquid level is one of the following liquid level heights:

[0016] The liquid level corresponding to the first set position between the receiving electrode and the transmitting electrode corresponding to the first target conductivity, the first target conductivity is the conductivity in the first conductivity threshold interval among the conductivities corresponding to the respective receiving electrodes, the first conductivity threshold interval is (A, B), A is the conductivity of the air, and B is the conductivity of the liquid;

[0017] the liquid level corresponding to the first target sending electrode corresponding to the second target conductivity, the first target sending electrode is arranged between the corresponding receiving electrode and the bottom of the container, and the conductivity corresponding to each receiving electrode is not in the first conductivity threshold interval, the second target conductivity is the conductivity equal to the conductivity of air among the conductivities corresponding to each receiving electrode, and the first target sending electrode is the sending electrode closest to the bottom of the container among the sending electrodes corresponding to the second target conductivity;

[0018] the liquid level height corresponding to the first target receiving electrode corresponding to the third target conductivity, the first target receiving electrode is arranged between the corresponding sending electrode and the bottom of the container, and the conductivity corresponding to each receiving electrode is not in the first conductivity threshold interval, the third target conductivity is the conductivity equal to the conductivity of air among the conductivities corresponding to each receiving electrode, and the first target receiving electrode is the receiving electrode closest to the bottom of the container among the receiving electrodes corresponding to the third target conductivity;

[0019] The fourth target conductivity corresponds to the liquid level height at the second set position between the receiving electrode and the transmitting electrode. The fourth target conductivity is the conductivity that undergoes a sudden change in the conductivity corresponding to each receiving electrode when the receiving electrodes are arranged in the first direction or the second direction. The sudden change in conductivity is determined based on the difference in the conductivity corresponding to two adjacent receiving electrodes when the receiving electrodes are arranged in the first direction or the second direction. The first direction is the direction from the bottom of the container to the liquid inlet of the container, and the second direction is the direction from the liquid inlet of the container to the bottom of the container.

[0020] In the present application, one or more determination methods may be used to determine the degree of degradation of the liquid according to the conductivity. For example, the degree of degradation is the degree of degradation corresponding to the second conductivity threshold interval of the conductivity corresponding to the reference position, the reference position is between the liquid surface and the bottom of the container, and the distance between the reference position and the liquid surface satisfies 40%*H to 70%*H, where H represents the liquid surface height.

[0021] For example, the liquid may include engine oil, and the container for the liquid may include an oil pan. The parameters determined by the signal processing module may include: the height of the engine oil level relative to the bottom of the oil pan and / or the degree of deterioration of the engine oil. In addition, according to relevant research, there is a significant difference between the conductivity of air and the conductivity of engine oil (the conductivity of air is about 2*10 -15 S / m~60*10 -15 S / m, the conductivity of engine oil is about 5*10 -9 S / m~20*10 -9S / m), the difference between the two is several orders of magnitude, and its composition can be confirmed by measuring the conductivity of the engine oil. There is also a significant difference between the conductivity of the engine oil before and after deterioration (the conductivity of the engine oil before deterioration is about 5*10 -9 S / m, the conductivity of the deteriorated oil reaches 20*10 -9 S / m), so the degree of deterioration of the engine oil can also be known by measuring the conductivity. Based on this, the conductivity of the material between the sending electrode and the corresponding receiving electrode can be detected to determine the liquid level and the degree of deterioration of the engine oil. Exemplarily, the signal processing module can determine the conductivity corresponding to each receiving electrode based on the excitation signal and the detection signal of each receiving electrode collected, and the conductivity is the conductivity of the material in the area between the corresponding receiving electrode and the corresponding sending electrode. In this way, the liquid level of the engine oil can be determined based on the conductivity corresponding to each receiving electrode. Afterwards, the reference position at the height of the position in the middle and lower layers of the engine oil can be determined based on the determined liquid level of the engine oil, and the degree of deterioration of the engine oil can be determined based on the conductivity of the engine oil at the reference position.

[0022] In the present application, the transmitting electrode may be adjacent to the corresponding receiving electrode, or one, two, three or more electrodes may be arranged between the corresponding transmitting electrode and the corresponding receiving electrode.

[0023] The relative position of the transmitting electrode and its corresponding receiving electrode can be determined according to the actual application. For example, the transmitting electrode can be arranged between the corresponding receiving electrode and the bottom of the oil pan. Alternatively, the transmitting electrode can also be arranged between the corresponding receiving electrode and the liquid inlet of the container.

[0024] In some examples, loading an excitation signal on at least one transmitting electrode includes: loading an excitation signal to each of a plurality of transmitting electrodes in turn according to a first direction from the bottom of the container to the liquid inlet of the container; or, loading an excitation signal to each of a plurality of transmitting electrodes in turn according to a second direction from the liquid inlet of the container to the bottom of the container.

[0025] Exemplarily, the shape of the electrode can be annular, then the multiple electrodes can include one or more annular electrodes, and the one or more annular electrodes are arranged around the outer wall of the probe rod. Alternatively, the shape of the electrode can also be block-shaped (rectangular, circular, strip, etc.), then the multiple electrodes can include one or more block-shaped electrodes, and the one or more block-shaped electrodes are arranged in sequence along the first direction or the second direction on the outer wall of the probe rod.

[0026] In a second aspect, an embodiment of the present application further provides a vehicle, which includes: a detection device and an engine. The oil pan of the engine contains oil. The detection device is the detection device described in the first aspect or any possible implementation of the first aspect. Moreover, the detection device is used to detect the parameters of the oil contained in the oil pan of the engine. With this arrangement, a detection device with a simple structure can be used to detect the parameters of the oil, achieving the effects of fast detection speed, objective and accurate results, and high reliability.

[0027] The vehicle is usually also provided with an on-board display device, through which a user interface (UserInterface) is displayed, and the operator can interact with the management system in the vehicle through the user interface. In the present application, the signal processing module is connected to the on-board display device (for example, through a wireless or wired communication connection) to realize data transmission between the signal processing module and the on-board display device, and the signal processing module sends the parameters to the on-board display device, so that the on-board display device displays the parameters on the user interface, so that the detected parameter results can be intuitively reflected to the operator, so that the operator can promptly know the consumption and deterioration of the engine oil, and whether it needs to be replenished or replaced.

[0028] In a third aspect, an embodiment of the present application further provides a detection method, comprising: after the probe rod of the probe is inserted into a container containing liquid, an excitation signal is loaded to at least one sending electrode among the multiple electrodes in the probe, and a detection signal of a receiving electrode corresponding to the sending electrode loaded with the excitation signal is collected among the multiple electrodes, wherein the multiple electrodes are respectively arranged on the outer wall of the probe rod, and the multiple electrodes are spaced apart along the extension direction of the probe rod; the multiple electrodes include at least one sending electrode and at least one receiving electrode, and at least one sending electrode corresponds to at least one receiving electrode one by one. And, according to the excitation signal and the detection signal collected from each receiving electrode, the parameters of the liquid are determined.

[0029] Furthermore, determining the parameters of the liquid according to the excitation signal and the detection signals collected from each of the receiving electrodes may include: determining the conductivity corresponding to each receiving electrode according to the excitation signal and the detection signals collected from each receiving electrode, the conductivity being the conductivity of the material in the area between the corresponding receiving electrode and the transmitting electrode. And, determining the parameters of the liquid according to the conductivity corresponding to each receiving electrode.

[0030] Exemplarily, the above parameters may include: the height of the liquid level relative to the bottom of the container and / or the degree of degradation of the liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A schematic diagram of the structure of a vehicle provided in one embodiment of the present application;

[0032] Figure 2 A schematic diagram of the structure of an engine provided in one embodiment of the present application;

[0033] Figure 3 A schematic diagram of the structure of a detection device provided in one embodiment of the present application;

[0034] Figure 4 A schematic cross-sectional view of a detection device provided in one embodiment of the present application;

[0035] Figure 5a A schematic diagram of the structure of a detection device provided in yet another embodiment of the present application;

[0036] Figure 5b A schematic diagram of the structure of a detection device provided in yet another embodiment of the present application;

[0037] Figure 6 A schematic diagram of the structure of an equivalent circuit model of a detection device provided in one embodiment of the present application;

[0038] Figure 7 A flow chart of a detection method provided in one embodiment of the present application;

[0039] Figure 8 A flowchart of a detection method provided in yet another embodiment of the present application.

[0040] Reference numerals:

[0041] 1- vehicle; 100- powertrain system; 200- wheel; 110- engine; 111- crankcase; 112- oil pan; 113- engine oil; 114- engine oil pump; 120- probe; 121- probe rod; 1211- detection unit; 1212- port unit; 122- electrode; 123- cable; 124- electrode wiring; 125- wiring connection port; 130- signal processing module ; 1221_a / 1222_a / 1223_a / 1224_a / 1225_a / 1226_a / 1227_a / 1228_a-transmitting electrode; 1221_b / 1222_b / 1223_b / 1224_b / 1225_b / 1226_b / 1227_b / 1228_b-receiving electrode; F1-first direction; F2-second direction. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings. The reference "one embodiment" or "some embodiments" described in this specification means that one or more embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in the differences in this specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways. In addition, the words "first", "second", etc. involved in this specification are only used to distinguish the purpose of description, and cannot be understood as indicating or implying relative importance, nor can they be understood as indicating or implying order.

[0043] The terms used in the following embodiments are only for the purpose of describing specific embodiments and are not intended to be limiting of the present application. As used in the specification and appended claims of the present application, the singular expressions "a", "an", "said", "above", "the" and "this" are intended to also include expressions such as "one or more", unless there is a clear contrary indication in the context.

[0044] The detection device provided in the embodiment of the present application can be widely used to detect the parameters of various liquids. Exemplarily, the detection device provided in the embodiment of the present application can be arranged in a vehicle as a vehicle-mounted detection device. Among them, the detection device can be directly fixedly arranged in certain parts of the vehicle to detect the liquid (such as engine oil) in the vehicle. Of course, the detection device can also be placed in the storage box of the vehicle. When the liquid needs to be detected, the operator can take the detection device out of the storage box and insert the probe of the detection device into the liquid for detection. At this time, the liquid detected by the detection device can be a liquid in the vehicle, such as engine oil. Alternatively, the liquid detected by the detection device can also be an industrial liquid in the industrial field, which is not limited here. It is understandable that the detection device proposed in the embodiment of the present application is intended to include but is not limited to being applied in these and any other suitable types of equipment.

[0045] The following is a detailed description of the application of the detection device provided in the embodiment of the present application to detect the parameters of the liquid (such as engine oil) in the vehicle as an example. For the detection process of the detection device provided in the embodiment of the present application applied to the parameters of the liquid in other fields, the following detection process of the parameters of the liquid in the vehicle can be referred to, and the repeated parts will not be discussed.

[0046] Figure 1 A schematic diagram of the structure of a vehicle provided by an embodiment of the present application. Figure 1 The vehicle 1 may include a powertrain system 100, wheels 200 and other structures. The powertrain system 100 may be connected to the wheels 200 in a transmission manner to provide driving force to the wheels 200 to drive the vehicle 1 to travel. The vehicle 1 may be a fuel vehicle, and the powertrain system 100 may include components such as an engine, a reducer, and a transmission. The driving force output by the engine may be transmitted to the reducer, and then transmitted to the transmission after the deceleration and torque increase effect of the reducer, and then output to the wheels 200 after the transmission changes speed according to the gear setting of the vehicle 1 to drive the vehicle 1 to travel.

[0047] Figure 2 This is a schematic diagram of the structure of an engine provided by an embodiment of the present application. Figure 2 The engine 110 mainly includes: a crankcase 111 and an oil pan 112. A crankshaft is arranged in the crankcase 111, and the oil pan 112 contains oil 113. After the engine 110 is started, the oil pump 114 pumps the oil 113 in the oil pan 112 into the crankcase 111. After the engine 110 is not started and has been stationary for a period of time, the oil 113 will return to the oil pan 112 and remain stationary in the oil pan 112. During the operation of the engine, the oil will be normally consumed and deteriorated. If there is too little oil in the engine, the lubrication, wear reduction, shock absorption and buffering effects of the oil on the engine will be weakened, and the engine will be aggravated. The wear and carbon deposits will increase, shortening the service life and performance of the engine. If the oil is deteriorated, the viscosity of the oil will increase, the various properties of the oil will be weakened, and it will not be able to play the role of lubrication and cleaning normally, which will also affect the service life and performance of the engine. To this end, the detection device provided in the embodiment of the present application can be fixed to the oil pan 112, and the probe of the detection device can be inserted into the engine oil to conveniently detect the parameters of the engine oil.

[0048] Figure 3 A schematic diagram of the structure of a detection device provided in one embodiment of the present application, Figure 4 This is a schematic cross-sectional view of a detection device provided by an embodiment of the present application. Figure 3 and Figure 4, the detection device may include: a probe 120 and a signal processing module 130. Among them, the probe 120 may include: a probe rod 121 and a plurality of electrodes 122 insulated from each other, the plurality of electrodes 122 are arranged on the outer wall of the probe rod 121 and the plurality of electrodes 122 may be arranged at intervals along the extension direction of the probe rod 121. In some examples, the material of the probe rod 121 may include an insulating material (such as an inorganic insulating material that is insoluble in the liquid to be detected), and the material of the electrode may include a metal material (such as Al, Cu, etc.), so that the electrode can be directly arranged on the outer wall of the probe rod 121. In addition, an insulating protective layer is also provided on the side of the electrode away from the probe rod 121, and the electrode is protected by the insulating protective layer to prevent the electrode from being corroded.

[0049] The present application does not limit the width of the electrode, which can be determined according to the needs of the actual application. In addition, in order to reduce the difficulty of process preparation and improve the accuracy, the width of each electrode can be made the same. In addition, the present application does not limit the width of the gap between two adjacent electrodes, which can be determined according to the needs of the actual application. In addition, in order to reduce the difficulty of process preparation and improve the accuracy, the width of the gap between two adjacent electrodes can be made the same.

[0050] Reference Figure 3 and Figure 4 , the probe rod 121 may include: a detection part 1211 and a port part 1212, and the port part 1212 is clamped on the outside of the liquid inlet of the container, so that the probe rod 121 can be fixedly set to reduce shaking. Each of the above-mentioned electrodes is arranged at intervals on the outer wall of the detection part 1211, and one end of the detection part 1211 is fixedly connected to the port part 1212, and the other end of the detection part 1211 is inserted into the liquid. Exemplarily, the container can be an oil pan in a vehicle, and the oil pan contains engine oil, and the other end of the detection part 1211 is inserted into the engine oil. In addition, the port part 1212 is clamped on the outside of the liquid inlet of the oil pan. In order to prevent foreign matter from entering the oil pan, the port part 1212 can be sealed with the liquid inlet. It is understandable that the other end of the detection part 1211 is a closed structure, which means that the other end of the detection part 1211 is closed and has no pores. In addition, the other end of the detection part 1211 can be a plane, a spherical surface, etc., which is not limited here. Of course, another opening may be provided in the container, the detection part is inserted into the solution through the opening, and the port part is clamped on the outside of the opening.

[0051] The present application does not limit the shape of the electrode. Figure 3 and Figure 4, the shape of the electrode 122 can be annular, then the multiple electrodes can include one or more annular electrodes, and the one or more annular electrodes are arranged around the outer wall of the probe rod 121, that is, the one or more annular electrodes can be arranged around the outer wall of the detection part 1211. Alternatively, the shape of the electrode can also be block-shaped (rectangular, circular, strip, etc.), then the multiple electrodes can include one or more block electrodes, and the one or more block electrodes can be arranged in sequence on the outer wall of the probe rod along the first direction (for example, from the bottom of the oil pan to the opening of the oil pan) or the second direction (for example, from the opening of the oil pan to the bottom of the oil pan), that is, the one or more block electrodes are arranged in sequence on the outer wall of the detection part along the first direction or the second direction.

[0052] Continue to refer to Figure 3 and Figure 4 , the detection part 1211 can be set as a hollow tubular structure, that is, the detection part 1211 has a containing space inside, is not solid, and the end of the detection part 1211 inserted into the liquid is a closed structure, so as to prevent the liquid from entering the detection part. Based on this, a plurality of mutually insulated electrode traces 124 can be set on the inner wall of the tubular structure, and each electrode 122 is set in a one-to-one correspondence with each electrode trace 124, and each electrode 122 is respectively connected to the corresponding electrode trace 124 through the first via GK1 that penetrates the detection part 1211. And, by connecting each electrode trace 124 to the signal processing module 130 respectively, the electrode is connected to the signal processing module 130 through the electrode trace 124, so as to realize signal transmission.

[0053] Since the detection device is fixedly set on the oil pan, the oil pan is close to the crankcase, and more heat will be generated when the crankshaft is running. If the signal processing module 130 is set close to the oil pan, it will be affected by the heat generated by the crankshaft, resulting in reduced service life and accuracy. For this reason, the signal processing module 130 can be set at a position far away from the engine, for example, the signal processing module 130 can be set in the processing chip area of ​​the vehicle's management system. In addition, in order to achieve the connection between the signal processing module 130 and the electrode wiring 124, the detection device can be provided with a cable 123 to connect the electrode wiring 124 to the signal processing module 130 through the cable 123. Exemplarily, a plurality of routing connection ports 125 are provided at the port portion 1212, and the plurality of routing connection ports 125 correspond one-to-one to the plurality of electrode routings 124, and the electrode routings 124 are connected to the corresponding routing connection ports 125 through the second via GK2 penetrating the port portion 1212, and the plurality of routing connection ports 125 are then connected to one end of the cable 123 (the connection can be achieved by welding), and the other end of the cable 123 is then connected to the signal processing module 130, so that the signal processing module 130 is respectively connected to each electrode, thereby achieving signal transmission between the signal processing module 130 and the electrodes.

[0054] In the embodiment of the present application, any of the above electrodes can be set as a transmitting electrode, and the signal processing module 130 can output a specific amplitude U0, a specific phase U1 and a specific phase U2 to each transmitting electrode in turn. (You can ), an AC excitation signal u0 of a specific frequency f, and the excitation signal u0 can be expressed as: u0 = U0sin(2πft). And, any of the above electrodes can be set as a receiving electrode, and the signal processing module 130 can collect the amplitude U from each receiving electrode in turn. s , Phase (You can ), AC detection signal u of frequency f s , and the detection signal u s It can be expressed as: In practical applications, the transmitting electrodes and the receiving electrodes can be set in a one-to-one correspondence, and the signal processing module 130 outputs an AC excitation signal u0 to a transmitting electrode, and collects a detection signal u0 from the receiving electrode corresponding to the transmitting electrode. s After that, repeat this operation until the detection signal u on the receiving electrode corresponding to each light-emitting electrode is collected. s It is understandable that the detection signals u collected from different receiving electrodes s , may be the same, or partially the same and partially different, or may be different.

[0055] In the present application, the transmitting electrodes and receiving electrodes corresponding to each other can be arranged adjacent to each other. Figure 5a and Figure 5b , Figure 5a This is a schematic diagram of the structure of a detection device provided in another embodiment of the present application. Figure 5b A schematic diagram of the structure of a detection device provided for another embodiment of the present application. Take the electrode as a ring electrode as an example, wherein 1221_a~1228_a are set as transmitting electrodes, and 1221_b~1228_b are set as receiving electrodes, wherein the transmitting electrode 1221_a corresponds to the receiving electrode 1221_b, the transmitting electrode 1222_a corresponds to the receiving electrode 1222_b, ... the transmitting electrode 1228_a corresponds to the receiving electrode 1228_b. Then the signal processing module 130 will first output an excitation signal u0 to the transmitting electrode 1221_a, and collect the detection signal u0 on the receiving electrode 1221_b. s After that, an excitation signal u0 is output to the transmitting electrode 1222_a, and a detection signal u0 is collected on the receiving electrode 1222_b. s After that, an excitation signal u0 is output to the transmitting electrode 1223_a, and a detection signal u0 is collected on the receiving electrode 1223_b. s After that, an excitation signal u0 is output to the transmitting electrode 1224_a, and a detection signal u0 is collected on the receiving electrode 1224_b. s After that, an excitation signal u0 is output to the transmitting electrode 1225_a, and a detection signal u0 is collected on the receiving electrode 1225_b. s After that, an excitation signal u0 is output to the transmitting electrode 1226_a, and a detection signal u0 is collected on the receiving electrode 1226_b. s After that, an excitation signal u0 is output to the transmitting electrode 1227_a, and a detection signal u0 is collected on the receiving electrode 1227_b. s After that, an excitation signal u0 is output to the transmitting electrode 1228_a, and a detection signal u0 is collected on the receiving electrode 1228_b. s Of course, one, two, three or more electrodes may be arranged between the corresponding transmitting electrodes and receiving electrodes.

[0056] The relative positions of the transmitting electrode and its corresponding receiving electrode can be determined according to the actual application. For example, the transmitting electrode can be arranged between the corresponding receiving electrode and the bottom of the oil pan. Figure 5a, according to this arrangement, the excitation signal can be output to the transmitting electrodes 1221_a~1228_a in sequence according to the first direction F1 (i.e. the direction indicated by the arrow F1) from the bottom of the oil pan to the liquid inlet of the oil pan, and the detection signal on the receiving electrodes 1221_b~1228_b can be collected. Alternatively, the transmitting electrode can also be arranged between the corresponding receiving electrode and the liquid inlet of the container. For example, referring to Figure 5b With this arrangement, the excitation signals can be output to the transmitting electrodes 1221_a~1228_a in sequence, and the detection signals on the receiving electrodes 1221_b~1228_b can be collected, according to the second direction F2 (i.e., the direction indicated by the arrow F2) pointing from the liquid inlet of the oil pan to the bottom of the oil pan.

[0057] In the present application, when the probe rod 121 is inserted into the oil pan, the top of the detection part 1211 (i.e., the side of the detection part 1211 away from the port part 1212) can be made to contact the bottom of the oil pan. The top of the detection part 1211 can also be made to have a certain distance from the bottom of the oil pan. In addition, by setting a suitable number of electrodes, some electrodes can be set above the oil surface of the engine oil, and some electrodes can be set in the engine oil. Also, when the detection part 1211 is inserted into the engine oil, the electrode can be made to be in non-direct contact with the engine oil, but to form an equivalent capacitance with the engine oil through the insulating protective layer. When an excitation signal is output to a certain transmitting electrode, the excitation signal can act on the engine oil through the equivalent capacitance, and then act on the receiving electrode through the equivalent capacitance formed by the corresponding receiving electrode, so that the detection signal can be collected on the receiving electrode. The signal processing module 130 can determine the parameters of the engine oil based on the excitation signal and the detection signals of each receiving electrode collected. Therefore, the current state of the engine oil can be described based on the determined parameters of the engine oil. With this arrangement, a detection device with a simple structure can be used to detect the parameters of the engine oil, achieving the effects of fast detection speed, objective and accurate results, and high reliability.

[0058] It is understandable that when the engine is started, the engine oil will enter the crankcase. If the detection device detects the parameters of the engine oil at this time, the results obtained may be inaccurate. Therefore, the detection device in the present application detects the parameters of the engine oil after the vehicle is started (i.e., the vehicle is powered on), but the engine is not started. For example, after the vehicle is turned off and parked for a period of time (for example, a few hours or a night), the detection device of the present application can detect the parameters of the engine oil when the vehicle is started again but the engine is not started. Alternatively, the detection device of the present application can detect the parameters of the engine oil after the vehicle is not turned off, but the engine is stopped for a period of time (for example, a few hours).

[0059] The vehicle is usually also provided with an onboard display device, through which a user interface (UserInterface) is displayed, and the operator can interact with the management system in the vehicle through the user interface. In the present application, the signal processing module 130 is connected to the onboard display device (for example, through a wireless or wired communication connection) to realize data transmission between the signal processing module 130 and the onboard display device, and the signal processing module 130 sends the parameters to the onboard display device, so that the onboard display device displays the parameters on the user interface, so that the detected parameter results can be intuitively reflected to the operator, so that the operator can promptly know the consumption and deterioration of the engine oil, and whether it needs to be replenished or replaced.

[0060] At present, the method for checking the oil level is to observe the oil position attached to the dipstick and compare it with the recommended level to confirm whether the oil level is appropriate. The inspection steps are roughly divided into the following steps: 1. Stop the engine; 2. Wait for the oil to flow back to the bottom of the engine; 3. Open the hood; 4. Pull out the dipstick; 5. Wipe the dipstick; 6. Insert the dipstick back; 7. Pull out the dipstick; 8. Observe the traces of attachment on the dipstick. Although the principle of this method is simple and the result is intuitive, it also has limitations: 1. The method has many steps and is inconvenient. Ordinary vehicle drivers will not check frequently and cannot obtain oil quantity information in time; 2. When the dipstick is pulled out, there is an opening in the engine, and there is a possibility that foreign matter enters the engine; 3. It cannot be detected online in real time. Based on this, the signal processing module 130 in the embodiment of the present application determines that the parameters of the oil may include: the liquid level of the oil relative to the bottom of the oil pan. With this setting, the oil level can be measured quickly and conveniently, and the result is accurate and reliable, and can be intuitively reflected to the operator.

[0061] The detection method of engine oil degradation is more subjective. In the relevant documents, 11 indicators (kinematic viscosity, flash point, pH, dilution ratio, acid value increase, organic insoluble matter content, moisture, iron content, copper content, aluminum content, silicon content) are given to characterize the degree of engine oil degradation, but these indicators require professional equipment for detection, and require sampling from the lower layer of engine oil in the engine, and the detection method is extremely inconvenient. However, in real life, the degree of deterioration of engine oil and whether it needs to be replaced are often determined by the vehicle mileage and the subjective judgment of the vehicle maintenance technician. However, the actual degree of deterioration of engine oil is related to factors such as engine working intensity and ambient temperature, and cannot be directly characterized by mileage. Based on this, the signal processing module 130 in the embodiment of the present application determines that the parameters of the engine oil may also include: the degree of deterioration of the engine oil. With this setting, the degree of deterioration of the engine oil can be conveniently and objectively reflected, and the test results can be intuitively reflected to the operator.

[0062] According to relevant research, there is a significant difference between the conductivity of air and the conductivity of engine oil (the conductivity of air is about 2*10 -15 S / m~60*10 -15 S / m, the conductivity of engine oil is about 5*10 -9 S / m~20*10 -9 S / m), the difference between the two is several orders of magnitude, and its composition can be confirmed by measuring the conductivity of the engine oil. There is also a significant difference between the conductivity of the engine oil before and after deterioration (the conductivity of the engine oil before deterioration is about 5*10 -9 S / m, the conductivity of the deteriorated oil reaches 20*10 - 9 S / m), so the degree of deterioration of the engine oil can also be known by measuring the conductivity. Based on this, the conductivity of the material between the sending electrode and the corresponding receiving electrode can be detected to determine the liquid level and the degree of deterioration of the engine oil. Exemplarily, the signal processing module 130 can determine the conductivity corresponding to each receiving electrode based on the excitation signal and the detection signal of each receiving electrode collected, and the conductivity is the conductivity of the material in the area between the corresponding receiving electrode and the corresponding sending electrode. In this way, the liquid level of the engine oil can be determined based on the conductivity corresponding to each receiving electrode. Afterwards, the reference position at the height of the position in the lower layer of the engine oil can be determined based on the determined liquid level of the engine oil, and the degree of deterioration of the engine oil can be determined based on the conductivity of the engine oil at the reference position.

[0063] Figure 6 This is a schematic diagram of the structure of an equivalent circuit model of a detection device provided in one embodiment of the present application. Figure 5a , Figure 5b as well as Figure 6 Taking the transmitting electrode 1221_a and the receiving electrode 1221_b as an example, the signal processing module 130 outputs an excitation signal u0 to the transmitting electrode 1221_a and collects a detection signal u0 from the receiving electrode 1221_b. s . The equivalent circuit model of this process includes: an AC power supply Uu0 that outputs an excitation signal u0, an equivalent capacitor CA, an equivalent resistor Z, an equivalent capacitor CB, and a signal processing module 130. Among them, the equivalent capacitor CA represents the equivalent capacitance formed by the transmitting electrode 1221_a and the engine oil through the insulating protective layer, the equivalent capacitor CB represents the equivalent capacitance formed by the receiving electrode 1221_b and the engine oil through the insulating protective layer, and the equivalent resistor Z represents the equivalent resistance of the material in the area between the transmitting electrode 1221_a and the receiving electrode 1221_b. In addition, the equivalent resistance Z can be expressed as: Z=R+Ci, R represents the resistive part of the equivalent resistance Z and is represented by the real part, and Ci represents the capacitive part of the equivalent resistance Z and is represented by the imaginary part. The resistive part R and the capacitive part Ci can be detected by the detection signal u sThe change in amplitude and phase of the excitation signal u0 is calculated, where After obtaining the resistive part R, the conductivity σ1 of the material in the area between the transmitting electrode 1221_a and the receiving electrode 1221_b can be inferred according to the conductor conductivity model, and the conductivity σ1 is used as the conductivity of the corresponding receiving electrode 1221_b. Similarly, the conductivity σ2 of the material in the area between the transmitting electrode 1222_a and the receiving electrode 1222_b can also be obtained, and the conductivity σ2 is used as the conductivity of the corresponding receiving electrode 1222_b. The conductivity σ3 of the material in the area between the transmitting electrode 1223_a and the receiving electrode 1223_b is used as the conductivity of the corresponding receiving electrode 1223_b. ... The conductivity σ8 of the material in the area between the transmitting electrode 1228_a and the receiving electrode 1228_b is used as the conductivity of the corresponding receiving electrode 1228_b.

[0064] In the present application, one or more determination methods can be used to determine the oil level according to the conductivity σ1 to σ8. The following is a detailed description with examples. It is understandable that the following embodiments are intended to better explain the present application, but are not intended to limit the present application.

[0065] Method 1: If the material in the area between a certain transmitting electrode and its corresponding receiving electrode includes both engine oil and air, then the conductivity of the material in the area between the transmitting electrode and its corresponding receiving electrode will be greater than the conductivity of air and less than the conductivity of engine oil. Therefore, a first conductivity threshold interval (A, B) can be set, where A is the conductivity of air. Since the conductivity of air is in the interval: 2*10 -15 S / m~60*10 -15 S / m, A can be made the maximum value of the conductivity of air, so that all the conductivity of air will not be in the first conductivity threshold interval. And B is the conductivity of engine oil. Since the conductivity of engine oil is also in the interval: 5*10 -9 S / m~20*10 -9 S / m, B can be made the minimum value of the conductivity of the engine oil. With this setting, all the conductivity of the engine oil will not be in the first conductivity threshold interval. That is to say, the value in the first conductivity threshold interval (A, B) is greater than the maximum value of the conductivity of the air, and less than the minimum value of the conductivity of the engine oil. Based on this, the signal processing module 130 can compare the conductivity σ1~σ8 corresponding to each receiving electrode 1228_b~1228_b with the first conductivity threshold interval (A, B). If the conductivity σ1~σ6 and if the conductivity σ8 are not in the first conductivity threshold interval (A, B), and the conductivity σ7 is in the first conductivity threshold interval (A, B), it is equivalent to the conductivity σ7 being greater than the maximum value of the conductivity of the air (i.e. 60*10-15 S / m), and the conductivity σ7 is less than the minimum value of the conductivity of the engine oil (i.e. 5*10 -9 S / m), indicating that the substances in the area between the sending electrode 1227_a and the receiving electrode 1227_b include both engine oil and air, indicating that the liquid level of the engine oil is in the area between the sending electrode 1227_a and the receiving electrode 1227_b, then the conductivity σ7 is determined as the first target conductivity, and the liquid level height corresponding to the first set position (for example, the middle position) between the sending electrode 1227_a and the receiving electrode 1227_b is determined as the liquid level height of the engine oil.

[0066] It is understandable that the liquid level correspondence relationship can be stored in the signal processing module 130, and the liquid level correspondence relationship includes: the correspondence relationship between the first set position between multiple transmitting electrodes and their corresponding receiving electrodes and multiple liquid level heights. Thus, when the signal processing module 130 determines the first set position, the determined first set position can be compared with the stored liquid level correspondence relationship to find the liquid level corresponding to the determined first set position. Alternatively, the signal processing module 130 can also calculate the liquid level corresponding to the first set position in real time based on the determined first set position and the height from the bottom of the oil pan to the liquid inlet.

[0067] Method 2: Reference Figure 5a , the transmitting electrodes 1228_a~1228_a are arranged between the corresponding receiving electrodes 1228_b~1228_b and the bottom of the oil pan, and the signal processing module 130 compares the conductivity σ1~σ8 corresponding to each receiving electrode 1228_b~1228_b with the first conductivity threshold interval (A, B). If none of the conductivity σ1~σ8 is in the first conductivity threshold interval (A, B), it means that there is no substance including both oil and air in the area between the transmitting electrode and the corresponding receiving electrode, and the conductivity of the conductivity σ1~σ8 equal to the conductivity of air can be determined. For example, if the conductivity σ7~σ8 is equal to the conductivity of air, the conductivity σ7~σ8 is determined as the second target conductivity. Furthermore, since the transmitting electrode 1227_a corresponding to the conductivity σ7 is closer to the bottom of the oil pan than the transmitting electrode 1228_a corresponding to the conductivity σ8, the transmitting electrode 1227_a can be determined as the first target transmitting electrode, and the liquid level height corresponding to the transmitting electrode 1227_a can be determined as the liquid level height of the engine oil.

[0068] It is understandable that the conductivity corresponding to the receiving electrode is equal to the conductivity of the air, which means that the conductivity corresponding to the receiving electrode is in the conductivity interval of 2*10 -15 S / m~60*10 -15S / m. That is, the conductivity corresponding to the receiving electrode is 2*10 -15 S / m~60*10 -15 A value in S / m.

[0069] It is understandable that the liquid level correspondence relationship can be stored in the signal processing module 130, and the liquid level correspondence relationship includes: the correspondence relationship between multiple transmitting electrodes and multiple liquid level heights. Thus, when the signal processing module 130 determines the first target transmitting electrode, the determined first target transmitting electrode can be compared with the stored liquid level correspondence relationship to find the liquid level corresponding to the first target transmitting electrode. Alternatively, the signal processing module 130 can also calculate the liquid level corresponding to the first target transmitting electrode in real time based on the determined position of the first target transmitting electrode and the height from the bottom of the oil pan to the liquid inlet.

[0070] Method 3: Reference Figure 5b The receiving electrodes 1228_b-1228_b are arranged between the corresponding transmitting electrodes 1228_a-1228_a and the bottom of the oil pan, and the signal processing module 130 compares the conductivity σ1-σ8 corresponding to each receiving electrode 1228_a-1228_b with the first conductivity threshold interval (A, B). If none of the conductivity σ1-σ8 is in the first conductivity threshold interval (A, B), the conductivity σ1-σ8 equal to the conductivity of air is determined. For example, if the conductivity σ1-σ2 is equal to the conductivity of air, the conductivity σ1-σ2 is determined as the third target conductivity. Furthermore, since the receiving electrode 1222_b corresponding to the conductivity σ2 is closer to the bottom of the oil pan than the receiving electrode 1221_b corresponding to the conductivity σ1, the receiving electrode 1222_b can be determined as the first target receiving electrode, and the liquid level corresponding to the receiving electrode 1222_b can be determined as the liquid level of the engine oil.

[0071] It is understandable that the liquid level correspondence relationship can be stored in the signal processing module 130, and the liquid level correspondence relationship includes: the correspondence relationship between multiple receiving electrodes and multiple liquid level heights. Thus, when the signal processing module 130 determines the first target receiving electrode, the determined first target receiving electrode can be compared with the stored liquid level correspondence relationship to find the liquid level corresponding to the first target receiving electrode. Alternatively, the signal processing module 130 can also calculate the liquid level corresponding to the first target receiving electrode in real time based on the determined position of the first target receiving electrode and the height from the bottom of the oil pan to the liquid inlet.

[0072] Method 4: Reference Figure 5a, the signal processing module 130 arranges the receiving electrodes 1221_b~1228_b according to the first direction F1 as: receiving electrode 1221_b, receiving electrode 1222_b, ... receiving electrode 1227_b, receiving electrode 1228_b, then the difference between the conductivity σ1 corresponding to the receiving electrode 1221_b and the conductivity σ2 corresponding to the receiving electrode 1222_b is σ1-σ2, the difference between the conductivity σ2 corresponding to the receiving electrode 1222_b and the conductivity σ3 corresponding to the receiving electrode 1223_b is σ2-σ3, ... the difference between the conductivity σ6 corresponding to the receiving electrode 1226_b and the conductivity σ7 corresponding to the receiving electrode 1227_b is σ6-σ7, and the difference between the conductivity σ7 corresponding to the receiving electrode 1227_b and the conductivity σ8 corresponding to the receiving electrode 1228_b is σ7-σ8.

[0073] If the substance in the area between the receiving electrode 1221_b and the transmitting electrode 1221_a is engine oil, and the substance in the area between the receiving electrode 1222_b and the transmitting electrode 1222_a is also engine oil, then the conductivity σ1 and σ2 are in the conductivity interval 5*10 of the engine oil. -9 S / m~20*10 -9 S / m, the difference σ1-σ2 is in the interval [-15*10 -9 , 15*10 -9 ]. Similarly, the substance in the area between the receiving electrode 1223_b and the transmitting electrode 1223_a is also engine oil, and the substance in the area between the receiving electrode 1224_b and the transmitting electrode 1224_a is also engine oil, then the difference values ​​σ3-σ2 and σ4-σ3 are both in the interval [-15*10 -9 , 15*10 -9 Based on this, it can be explained that the conductivity σ1~σ4 is not much different and there is no sudden change.

[0074] If the substance in the area between the receiving electrode 1226_b and the transmitting electrode 1226_a is air, and the substance in the area between the receiving electrode 1227_b and the transmitting electrode 1227_a is also air, then the conductivity σ6 and σ7 are in the conductivity interval 2*10 of air. -15 S / m~60*10 -15 S / m, the difference σ7-σ6 is in the interval [-58*10 -15 ,58*10 -15 Similarly, if the material in the area between the receiving electrode 1228_b and the transmitting electrode 1228_a is also air, the difference σ7-σ8 is also in the interval [-58*10 -15 ,58*10 -15 Based on this, it can be explained that the conductivity σ6~σ8 is not much different and there is no sudden change.

[0075] However, if the substance in the area between the receiving electrode 1225_b and the transmitting electrode 1225_a includes both air and oil, the conductivity σ5 is greater than the maximum conductivity of the air, and the conductivity σ5 is less than the minimum conductivity of the oil, then the difference σ5-σ4 and σ6-σ5 are not in the interval [-15*10 -9 , 15*10 -9 ] and the interval [-58*10 -15 ,58*10 -15 ] Based on this, it can be explained that the conductivity σ5 is greatly different from the conductivity σ1~σ4 and the conductivity σ6~σ8, and a conductivity mutation occurs at the conductivity σ5. Therefore, the conductivity σ5 can be determined as the fourth target conductivity, and the liquid level corresponding to the second set position (for example, the middle position) between the receiving electrode 1225_b and the transmitting electrode 1225_a is determined as the liquid level of the engine oil.

[0076] It is understandable that the liquid level correspondence relationship can be stored in the signal processing module 130, and the liquid level correspondence relationship includes: the correspondence relationship between the second set position between multiple transmitting electrodes and their corresponding receiving electrodes and multiple liquid level heights. Thus, when the signal processing module 130 determines the second set position, the determined second set position can be compared with the stored liquid level correspondence relationship to find the liquid level corresponding to the determined second set position. Alternatively, the signal processing module 130 can also calculate the liquid level corresponding to the second set position in real time based on the determined second set position and the height from the bottom of the oil pan to the liquid inlet.

[0077] Method 5: Combination Figure 5b As shown, the signal processing module 130 arranges the respective receiving electrodes 1221_b~1228_b according to the second direction F2 as: receiving electrode 1221_b, receiving electrode 1222_b, ... receiving electrode 1227_b, receiving electrode 1228_b, then the difference between the conductivity σ1 corresponding to the receiving electrode 1221_b and the conductivity σ2 corresponding to the receiving electrode 1222_b is σ1-σ2, the difference between the conductivity σ2 corresponding to the receiving electrode 1222_b and the conductivity σ3 corresponding to the receiving electrode 1223_b is σ2-σ3, ... the difference between the conductivity σ6 corresponding to the receiving electrode 1226_b and the conductivity σ7 corresponding to the receiving electrode 1227_b is σ6-σ7, and the difference between the conductivity σ7 corresponding to the receiving electrode 1227_b and the conductivity σ8 corresponding to the receiving electrode 1228_b is σ7-σ8.

[0078] If the substance in the area between the receiving electrode 1221_b and the transmitting electrode 1221_a is air, the substance in the area between the receiving electrode 1222_b and the transmitting electrode 1222_a is also air, and the substance in the area between the receiving electrode 1223_b and the transmitting electrode 1223_a is also air, then the conductivity σ1~σ3 is in the conductivity interval of air 2*10 -15 S / m~60*10 -15 S / m, the difference σ2-σ1, σ3-σ2 is in the interval [-58*10 -15 ,58*10 -15 Based on this, it can be explained that the conductivity σ1~σ3 is not much different and there is no sudden change.

[0079] If the substance in the area between the receiving electrode 1225_b and the transmitting electrode 1225_a is engine oil, the substance in the area between the receiving electrode 1226_b and the transmitting electrode 1226_a is also engine oil, the substance in the area between the receiving electrode 1227_b and the transmitting electrode 1227_a is also engine oil, and the substance in the area between the receiving electrode 1228_b and the transmitting electrode 1228_a is also engine oil, then the conductivity σ5~σ8 is in the conductivity range of 5*10 of the engine oil. -9 S / m~20*10 -9 S / m, the differences σ6-σ5, σ7-σ6, σ8-σ7 are all in the interval [-15*10 -9 , 15*10 -9 Based on this, it can be explained that the conductivity σ5~σ8 is not much different and there is no sudden change.

[0080] However, if the substance in the area between the receiving electrode 1224_b and the transmitting electrode 1224_a includes both air and oil, the conductivity σ4 is greater than the maximum conductivity of the air, and the conductivity σ4 is less than the minimum conductivity of the oil, then the difference σ5-σ4 and σ4-σ3 are not in the interval [-15*10 -9 , 15*10 -9 ] and the interval [-58*10 -15 ,58*10 -15 ] Based on this, it can be explained that the conductivity σ4 is greatly different from the conductivity σ1 to σ3 and the conductivity σ5 to σ8, and a conductivity mutation occurs at the conductivity σ4. Therefore, the conductivity σ4 can be determined as the fourth target conductivity, and the liquid level corresponding to the second set position (e.g., the middle position) between the receiving electrode 1224_b and the transmitting electrode 1224_a is determined as the liquid level of the engine oil.

[0081] In the present application, the signal processing module 130 can determine the reference position between the liquid level of the engine oil and the bottom of the container according to the determined liquid level of the engine oil, and make the distance between the reference position and the liquid level of the engine oil have H0 (H0 = 40% * H ~ 70% * H), H represents the determined liquid level, and the reference position can be used as the position of the lower layer of the engine oil. After that, the conductivity σs corresponding to the reference position is determined, and then according to the one-to-one correspondence between the conductivity σs and multiple second conductivity threshold intervals and multiple degradation degrees, the degradation degree corresponding to the second conductivity threshold interval where the conductivity σs is located can be determined, and the determined degradation degree is used to characterize the current degradation degree of the engine oil. Among them, the signal processing module 130 can pre-store the one-to-one correspondence between multiple second conductivity threshold intervals and multiple degradation degrees. For example, according to the degradation degree from low to high, it is divided into: the first degradation degree, the second degradation degree, ... the Kth degradation degree, the first degradation degree corresponds to the second conductivity threshold interval [C1, C2), the second degradation degree corresponds to the second conductivity threshold interval [C2, C3), ... the Kth degradation degree corresponds to the second conductivity threshold interval [C K , C K+1 ). If the conductivity σs is in the second conductivity threshold interval [C1, C2), the first degradation degree is used to characterize the current degradation degree of the engine oil. If the conductivity σs is in the second conductivity threshold interval [C2, C3), the second degradation degree is used to characterize the current degradation degree of the engine oil. The rest is similar and will not be elaborated here.

[0082] The present application does not limit the specific value of H0, for example, H0 = 50% * H to 60% * H. Optionally, H0 can be: 40% * H, 45% * H, 50% * H, 55% * H, 60% * H, 65% * H, 70% * H, etc.

[0083] The present application does not limit the specific forms of expression of the first degree of degradation, the second degree of degradation, ... the Kth degree of degradation. For example, the first degree of degradation, the second degree of degradation, ... the Kth degree of degradation may be different percentages respectively. Alternatively, the first degree of degradation, the second degree of degradation, ... the Kth degree of degradation may be different levels respectively.

[0084] The signal processing module 130 may use one or more determination methods to determine the conductivity σs corresponding to the reference position. Figure 5a It is to be understood that the following embodiments are for better explanation of the present application, but are not intended to limit the present application.

[0085] Method 1: The signal processing module 130 can determine the transmitting electrode 1223_a and the receiving electrode 1223_b corresponding to the reference position according to the reference position, and output the excitation signal u0 to the transmitting electrode 1223_a, and collect the detection signal u0 on the receiving electrode 1223_b. s , according to the excitation signal u0 and the detection signal u s The electrical conductivity σm is determined and the electrical conductivity σm is determined as the electrical conductivity σs.

[0086] Method 2: Repeat the operation process in method 1 multiple times to obtain multiple conductivities σm, and determine the average value (such as arithmetic mean value, weighted mean value) of the determined conductivities σm as the conductivity σs.

[0087] Method three: the signal processing module 130 may determine the transmitting electrode 1223_a and the receiving electrode 1223_b corresponding to the reference position according to the reference position, and determine the conductivity σ3 corresponding to the receiving electrode 1223_b as the conductivity σs.

[0088] Method 4: The signal processing module 130 can determine the transmitting electrode 1223_a and the receiving electrode 1223_b corresponding to the reference position according to the reference position, and output the excitation signal u0 to the transmitting electrode 1223_a, and collect the detection signal u0 on the receiving electrode 1223_b. s , according to the excitation signal u0 and the detection signal u s The conductivity σm is determined. Then, the average value (eg, arithmetic mean value, weighted mean value) of the conductivity σm and the conductivity σ3 corresponding to the receiving electrode 1223_b is determined as the conductivity σs.

[0089] Method 5: Repeat the operation process in method 1 multiple times to obtain multiple conductivities σm, and determine the average value (such as arithmetic mean, weighted average value) of the determined conductivities σm and the conductivity σ3 corresponding to the receiving electrode 1223_b as the conductivity σs.

[0090] It is understandable that the signal processing module can be a field programmable gate array (FPGA), a central processing unit (CPU), a general processor, a digital signal processing (DSP), an application specific integrated circuit (ASIC), or other programmable logic devices, transistor logic devices, hardware components or any combination thereof. It can implement or execute various exemplary logic blocks, modules and circuits described in conjunction with the disclosure of this application. The above-mentioned signal processing module can also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of DSP and microprocessors, etc.

[0091] Based on the introduction of the above structure, refer to Figure 7 , Figure 7 This is a flow chart of a detection method provided by an embodiment of the present application. This embodiment of the present application also provides a power allocation method, which may include:

[0092] S10, outputting an excitation signal to at least one transmitting electrode among the multiple electrodes in the probe, and collecting a detection signal from a receiving electrode among the multiple electrodes corresponding to the transmitting electrode loaded with the excitation signal;

[0093] S20, determining the parameters of the liquid according to the excitation signal and the detection signals collected from each receiving electrode.

[0094] Combine the following Figure 5a as well as Figure 8 , the detection method provided in this application is explained. Among them, Figure 8 A flow chart of a detection method provided in another embodiment of the present application. The detection method provided in the embodiment of the present application includes:

[0095] S00, the vehicle starts, but the engine does not start.

[0096] S11, the signal processing module 130 outputs an AC excitation signal u0 to the transmitting electrode 1221_a, and collects the detection signal us on the receiving electrode 1221_b. The conductivity σ1 of the material between the transmitting electrode 1221_a and the receiving electrode 1221_b can be determined based on the AC excitation signal u0 and the detection signal us. Similarly, the conductivity σ2 of the material between the transmitting electrode 1222_a and the receiving electrode 1222_b, the conductivity σ3 of the material between the transmitting electrode 1223_a and the receiving electrode 1223_b, ... The conductivity σ8 of the material between the transmitting electrode 1228_a and the receiving electrode 1228_b is determined, thereby determining the conductivity corresponding to each receiving electrode.

[0097] S12. The signal processing module 130 arranges the receiving electrodes 1221_b to 1228_b according to the first direction F1 as follows: receiving electrode 1221_b, receiving electrode 1222_b, ... receiving electrode 1227_b, receiving electrode 1228_b. Then, the difference between the conductivity σ1 corresponding to the receiving electrode 1221_b and the conductivity σ2 corresponding to the receiving electrode 1222_b is σ1-σ2, the difference between the conductivity σ2 corresponding to the receiving electrode 1222_b and the conductivity σ3 corresponding to the receiving electrode 1223_b is σ2-σ3, ... the difference between the conductivity σ6 corresponding to the receiving electrode 1226_b and the conductivity σ7 corresponding to the receiving electrode 1227_b is σ6-σ7, and the difference between the conductivity σ7 corresponding to the receiving electrode 1227_b and the conductivity σ8 corresponding to the receiving electrode 1228_b is σ7-σ8. If the differences σ1-σ2, σ2-σ3, σ3-σ4 are all in the interval [-15*10 -9 , 15*10 -9 ], the difference values ​​σ6-σ7 and σ7-σ8 are both in the interval [-58*10 -15 ,58*10 -15 ], however, the differences σ4-σ5 and σ5-σ6 are not in the interval [-15*10 -9 , 15*10 -9 ] and the interval [-58*10 -15 ,58*10 -15 ] Based on this, it can be explained that the conductivity σ5 is greatly different from the conductivity σ1~σ4 and the conductivity σ6~σ8, and a conductivity mutation occurs at the conductivity σ5. Therefore, the conductivity σ5 can be determined as the fourth target conductivity, and the liquid level corresponding to the second set position (for example, the middle position) between the receiving electrode 1225_b and the transmitting electrode 1225_a is determined as the liquid level of the engine oil, thereby determining the liquid level of the engine oil.

[0098] S21 . The signal processing module 130 determines a reference position according to the determined oil level.

[0099] S22, the signal processing module 130 determines the transmitting electrode 1223_a and the receiving electrode 1223_b corresponding to the reference position according to the reference position, and outputs the excitation signal u0 to the transmitting electrode 1223_a, collects the detection signal us on the receiving electrode 1223_b, determines the conductivity σm according to the excitation signal u0 and the detection signal us, and determines the conductivity σm as the conductivity σs. Repeat this operation multiple times to obtain multiple conductivities σs, and determine the average value (such as arithmetic mean value, weighted average value) of the determined conductivities σm as the conductivity σs.

[0100] S23 : The signal processing module 130 determines the degradation degree of the engine oil according to the one-to-one correspondence between the conductivity σs and the plurality of second conductivity threshold intervals and the plurality of degradation degrees.

[0101] The above contents are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be covered by the protection scope of the present application.

Claims

1. A detection device, characterized in that: include: Probe and signal processing module; The probe comprises: a probe rod and a plurality of electrodes insulated from each other, wherein the plurality of electrodes are respectively arranged on the outer wall of the probe rod, and the plurality of electrodes are arranged at intervals along the extension direction of the probe rod; the plurality of electrodes comprise at least one transmitting electrode and at least one receiving electrode, and the at least one transmitting electrode corresponds to the at least one receiving electrode one by one; The signal processing module is respectively connected to the multiple electrodes, and is used to: after the probe rod is inserted into a container containing liquid, load an excitation signal to at least one of the transmitting electrodes, and collect the detection signal of the receiving electrode corresponding to the transmitting electrode loaded with the excitation signal, and determine the parameters of the liquid based on the excitation signal and the detection signals collected from each of the receiving electrodes.

2. The detection device according to claim 1, characterized in that The probe rod comprises a detection portion and a port portion, and the port portion is used for clamping on the outside of the container; The plurality of electrodes are respectively arranged on the outer wall of the detection part, and one end of the detection part is fixedly connected to the port part, and the other end is inserted into the liquid.

3. The detection device according to claim 2, characterized in that: The detection part is a hollow tubular structure, and one end of the detection part inserted into the liquid is a closed structure; the inner wall of the tubular structure is provided with a plurality of electrode wirings insulated from each other, and the plurality of electrode wirings are respectively connected to the signal processing module; The plurality of electrode wirings correspond to the plurality of electrodes one by one, and the electrode wirings are connected to the corresponding electrodes through first via holes penetrating the detection unit.

4. The detection device according to claim 3, characterized in that: The detection device further comprises: a cable; The port portion has a plurality of routing connection ports, the plurality of routing connection ports correspond one-to-one to the plurality of electrode routings, and the electrode routings are connected to the corresponding routing connection ports through a second via hole penetrating the port portion, and the plurality of routing connection ports are connected to the signal processing module through the cable.

5. The detection device according to any one of claims 1 to 4, characterized in that: Determining the parameters of the liquid according to the excitation signal and the detection signals collected from each of the receiving electrodes includes: Determine the conductivity corresponding to each of the receiving electrodes according to the excitation signal and the detection signal collected from each of the receiving electrodes, wherein the conductivity is the conductivity of a substance in a region between the corresponding receiving electrode and the transmitting electrode; The parameters of the liquid are determined according to the conductivity corresponding to each of the receiving electrodes.

6. The detection device according to any one of claims 1 to 5, characterized in that: The parameters include: the height of the liquid level relative to the bottom of the container and / or the degree of degradation of the liquid.

7. The detection device according to claim 6, characterized in that: The liquid level of the liquid is one of the following liquid level heights: a liquid level corresponding to a first set position between a receiving electrode and a transmitting electrode corresponding to a first target conductivity, wherein the first target conductivity is a conductivity in a first conductivity threshold interval among the conductivities corresponding to the respective receiving electrodes, wherein the first conductivity threshold interval is (A, B), wherein A is the conductivity of air, and B is the conductivity of the liquid; a liquid level height corresponding to a first target sending electrode corresponding to a second target conductivity, the first target sending electrode being disposed between a corresponding receiving electrode and the bottom of the container, and the conductivity corresponding to each of the receiving electrodes being not within the first conductivity threshold interval, the second target conductivity being a conductivity equal to the conductivity of the air among the conductivities corresponding to each of the receiving electrodes, and the first target sending electrode being a sending electrode closest to the bottom of the container among the sending electrodes corresponding to the second target conductivity; a liquid level height corresponding to a first target receiving electrode corresponding to a third target conductivity, the first target receiving electrode being disposed between a corresponding sending electrode and the bottom of the container, and the conductivity corresponding to each of the receiving electrodes being not within the first conductivity threshold interval, the third target conductivity being a conductivity equal to the conductivity of the air among the conductivities corresponding to each of the receiving electrodes, and the first target receiving electrode being a receiving electrode closest to the bottom of the container among the receiving electrodes corresponding to the third target conductivity; a liquid level height corresponding to a second set position between the receiving electrode and the transmitting electrode corresponding to a fourth target conductivity, wherein the fourth target conductivity is a conductivity in which a sudden change occurs in the conductivity corresponding to each of the receiving electrodes when the receiving electrodes are arranged in the first direction or the second direction, and the sudden change in conductivity is determined based on a difference in the conductivity corresponding to two adjacent receiving electrodes when the receiving electrodes are arranged in the first direction or the second direction, wherein the first direction is a direction from the bottom of the container to the liquid inlet of the container, and the second direction is a direction from the liquid inlet of the container to the bottom of the container.

8. The detection device according to claim 6 or 7, characterized in that: The degree of degradation is the degree of degradation corresponding to the conductivity corresponding to the reference position being in the second conductivity threshold interval, the reference position being between the liquid level of the liquid and the bottom of the container, the distance between the reference position and the liquid level satisfying 40%*H to 70%*H, and H represents the liquid level height.

9. The detection device according to any one of claims 1 to 8, characterized in that: The transmitting electrodes and the receiving electrodes corresponding to each other are adjacent to each other.

10. The detection device according to any one of claims 1 to 9, characterized in that: The step of applying an excitation signal to at least one of the transmitting electrodes comprises: According to a first direction from the bottom of the container to the liquid inlet of the container, sequentially applying an excitation signal to each of the plurality of electrodes; or, According to a second direction from the liquid inlet of the container to the bottom of the container, an excitation signal is sequentially applied to each of the plurality of electrodes.

11. The detection device according to any one of claims 1 to 10, characterized in that: The plurality of electrodes include one or more annular electrodes, and the one or more annular electrodes respectively surround the outer wall of the probe shaft.

12. The detection device according to any one of claims 1 to 11, characterized in that: The excitation signal is an AC excitation signal.

13. A vehicle, characterized in that: Comprising an engine and a detection device as claimed in any one of claims 1 to 12; The oil pan of the engine contains organic oil; The detection device is used to detect parameters of the engine oil contained in the oil pan of the engine.

14. The vehicle according to claim 13, characterized in that The vehicle further includes an on-board display device, and the signal processing module is connected to the on-board display device; The signal processing module is further used to send the parameters to the vehicle-mounted display device so that the vehicle-mounted display device displays the parameters.

15. A detection method, characterized in that: include: After the probe rod of the probe is inserted into a container containing liquid, an excitation signal is loaded to at least one sending electrode among a plurality of electrodes in the probe, and a detection signal of a receiving electrode among the plurality of electrodes corresponding to the sending electrode loaded with the excitation signal is collected; the plurality of electrodes are respectively arranged on the outer wall of the probe rod, and the plurality of electrodes are spaced apart along the extension direction of the probe rod; the plurality of electrodes include at least one sending electrode and at least one receiving electrode, and the at least one sending electrode corresponds to the at least one receiving electrode one by one; The parameters of the liquid are determined according to the excitation signal and the detection signals collected from the respective receiving electrodes.

16. The detection method according to claim 15, characterized in that: Determining the parameters of the liquid according to the excitation signal and the detection signals collected from each of the receiving electrodes includes: Determine the conductivity corresponding to each of the receiving electrodes according to the excitation signal and the detection signal collected from each of the receiving electrodes, wherein the conductivity is the conductivity of a substance in a region between the corresponding receiving electrode and the transmitting electrode; The parameters of the liquid are determined according to the conductivity corresponding to each of the receiving electrodes.

17. The detection method according to claim 15 or 16, characterized in that: The parameters include: the height of the liquid level relative to the bottom of the container and / or the degree of degradation of the liquid.

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