Tail gas treatment sensor

Abstract

The invention relates to a tail gas treatment sensor. A tail gas treatment sensor comprises a base provided with an accommodating cavity; the liquid pipe is arranged on the base and is provided with a first accommodating cavity; the liquid pipe is further provided with a first through hole communicating with the first containing cavity so that external liquid can enter the first containing cavity. The liquid guide structure is arranged on the base and is provided with a second accommodating cavity; the liquid guide structure is further provided with a second through hole communicating with the second containing cavity so that external liquid can enter the second containing cavity. The liquid level probe is arranged in the accommodating cavity and is opposite to the first accommodating cavity; the quality probe is arranged in the accommodating cavity and is opposite to the second accommodating cavity; and the control panel is arranged in the accommodating cavity, and the control panel is electrically connected with the liquid level probe and the quality probe. The tail gas treatment sensor provided by the invention is high in measurement result accuracy and high in reliability.

Description

Technical Field

[0001] The present application relates to the field of sensor technology, and in particular to an exhaust gas treatment sensor. Background Art

[0002] The SCR system (Selective Catalytic Reduction System) is a catalytic converter installed in the exhaust treatment system of a diesel engine. It injects a reducing agent to catalytically reduce nitrogen oxides in the exhaust gas into nitrogen and water. Currently, the SCR system has been widely used in vehicles.

[0003] The reducing agent generally used in the SCR system is urea solution, and the concentration and liquid level of the urea solution directly affect the effect of catalytic reduction. In order to measure the concentration and liquid level of the urea solution, a quality sensor and a liquid level sensor are usually set in the urea tank. The quality sensor detects the concentration of the urea solution through ultrasound, and the liquid level sensor detects the liquid level of the urea solution through ultrasound.

[0004] At present, a lot of bubbles will be produced when adding urea solution to the urea tank. The presence of bubbles will greatly affect the measurement results, resulting in inaccurate measurements. At the same time, the car will shake violently during driving, and the measurement results of the liquid level sensor will also have large errors. Summary of the invention

[0005] Based on this, it is necessary to provide an exhaust gas treatment sensor to address the problem that the above-mentioned bubbles and jitters during driving may affect the measurement results.

[0006] An exhaust gas treatment sensor, the exhaust gas treatment sensor comprising:

[0007] A base is provided with a receiving cavity;

[0008] A liquid pipe is arranged on the base and has a first accommodating cavity. The liquid pipe also has a first through hole communicating with the first accommodating cavity so as to allow external liquid to enter the first accommodating cavity.

[0009] a liquid guiding structure, which is arranged on the base and has a second accommodating cavity; the liquid guiding structure also has a second through hole communicating with the second accommodating cavity, so as to allow external liquid to enter the second accommodating cavity;

[0010] A liquid level probe is disposed in the accommodating cavity and is arranged opposite to the first accommodating cavity;

[0011] A quality probe is disposed in the accommodating cavity and is disposed opposite to the second accommodating cavity; and

[0012] A control board is arranged in the accommodating cavity, and the control board is electrically connected to the liquid level probe and the quality probe.

[0013] In one of the embodiments, the inner diameter of the first accommodating cavity of the liquid tube is 5 mm to 15 mm.

[0014] In one embodiment, the liquid pipe includes a first sleeve and a second sleeve, one end of the first sleeve is arranged on the base and is arranged opposite to the liquid level probe; at least a portion of the second sleeve is inserted into the end of the first sleeve away from the base, and the inner cavity of the second sleeve is connected to the inner cavity of the first sleeve to form the first accommodating cavity.

[0015] In one embodiment, an annular slot is formed on the inner wall of one end of the first sleeve away from the base, and the second sleeve is inserted into the annular slot.

[0016] In one of the embodiments, the exhaust gas treatment sensor further includes a first kit, which is sleeved on the outside of the liquid guiding structure; the first kit is provided with a liquid inlet hole and a discharge hole, and the liquid inlet hole and the discharge hole are both connected to the second accommodating cavity.

[0017] In one embodiment, the exhaust gas treatment sensor further includes a second set, and the second set is sleeved on the outside of the connection between the first sleeve and the second sleeve.

[0018] In one of the embodiments, the exhaust gas treatment sensor further includes a reflector, which is disposed in the second accommodating cavity and located at an end of the liquid guiding structure away from the base.

[0019] In one embodiment, the accommodating cavity is provided with a first chamber opposite to the first accommodating cavity and a second chamber opposite to the second accommodating cavity, the liquid level probe is arranged in the first chamber, and the quality probe is arranged in the second chamber.

[0020] In one embodiment, the liquid level probe includes a first transducer, and a side of the first transducer facing the liquid pipe is used to emit ultrasonic waves; the quality probe includes a second transducer, and a side of the second transducer facing the liquid guide structure is used to emit ultrasonic waves.

[0021] In one embodiment, the liquid level probe further includes a first sound absorbing member, which covers the non-ultrasonic emission surface of the first transducer; the quality probe further includes a second sound absorbing member, which covers the non-ultrasonic emission surface of the second transducer.

[0022] The exhaust gas treatment sensor is provided with a first accommodating chamber by setting a liquid pipe, and also provides a first through hole connected to the first accommodating chamber, so that the urea solution can flow into the first accommodating chamber of the liquid pipe from the first through hole. The liquid level probe is arranged relative to the first accommodating chamber, and can measure the liquid level in the first accommodating chamber. The shaking during driving has little effect on the liquid level in the first accommodating chamber, and the liquid level in the first accommodating chamber has good stability, which helps to improve the accuracy and reliability of liquid level measurement. A second accommodating chamber is provided by setting a liquid guide structure, and also provides a second through hole connected to the second accommodating chamber, so that the urea solution can flow into the second accommodating chamber of the liquid guide structure from the second through hole. The quality probe is arranged relative to the second accommodating chamber, and can measure the concentration of the solution in the second accommodating chamber. At the same time, the liquid guide structure also relatively reduces the risk of bubbles entering the concentration measurement area, which helps to improve the accuracy and reliability of concentration measurement and reduce measurement errors. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the structure of an exhaust gas treatment sensor provided in one embodiment of the present application.

[0024] Figure 2 A schematic cross-sectional view of a partial structure of an exhaust gas treatment sensor provided in one embodiment of the present application.

[0025] Figure 3 A schematic diagram of the structure of a sheath in an exhaust gas treatment sensor provided in one embodiment of the present application.

[0026] Figure 4 A schematic cross-sectional view of a sheath in an exhaust gas treatment sensor provided in an embodiment of the present application.

[0027] Figure numerals: 10, base; 11, accommodating chamber; 20, liquid pipe; 21, first accommodating chamber; 22, first sleeve; 23, second sleeve; 30, liquid guiding structure; 31, second accommodating chamber; 40, liquid level probe; 41, first transducer; 42, first sound absorbing member; 50, quality probe; 51, second transducer; 52, second sound absorbing member; 60, control panel; 70, sheath; 71, first kit; 711, liquid inlet hole; 712, outlet hole; 72, second kit; 73, third kit; 80, reflecting member; 100, liquid surface. DETAILED DESCRIPTION

[0028] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0029] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0030] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0031] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0032] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0033] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0034] As mentioned in the background technology, in the SCR system, a urea tank for storing urea solution needs to be equipped with a liquid level sensor and a quality sensor. The liquid level sensor can monitor the liquid level of the urea solution in the urea tank in real time, and the quality sensor can monitor the concentration of the urea solution in real time.

[0035] However, when there are many bubbles in the urea solution in the urea tank, it will affect the concentration measurement result of the quality sensor, making it impossible to ensure that the urea solution in the urea tank meets the use requirements of the SCR system, affecting the catalytic efficiency of the SCR system. When the car shakes violently during driving, it will affect the liquid level measurement result of the liquid level sensor, making it impossible to ensure that the SCR system has enough urea solution to carry out the reduction reaction of nitrogen oxides, and there may even be a risk that the catalytic work cannot be carried out normally due to insufficient urea solution.

[0036] To solve the above problems, the present application provides an exhaust gas treatment sensor with high measurement accuracy and strong reliability. Figure 1 and Figure 2 , Figure 1 The structure diagram of the exhaust gas treatment sensor in one embodiment of the present application is shown. Figure 2A schematic cross-sectional view of a partial structure of an exhaust gas treatment sensor in an embodiment of the present application is shown. The exhaust gas treatment sensor provided in an embodiment of the present application includes a base 10, a liquid pipe 20, a liquid guide structure 30, a liquid level probe 40, a quality probe 50 and a control board 60. The base 10 is provided with a receiving cavity 11; the liquid pipe 20 is arranged on the base 10 and is provided with a first receiving cavity 21. The liquid pipe 20 is also provided with a first through hole (not shown), which is connected to the first receiving cavity 21 so that external liquid can flow into the first receiving cavity 21 of the liquid pipe 20 through the first through hole; the liquid guide structure 30 is arranged on the base 10 and is provided with a first receiving cavity 21. The second accommodating cavity 31, the liquid-conducting structure 30 is also provided with a second through hole (not shown), the second through hole is communicated with the second accommodating cavity 31, so that the external liquid can flow into the second accommodating cavity 31 of the liquid-conducting structure 30 through the second through hole; the liquid level probe 40, the quality probe 50 and the control board 60 are all arranged in the accommodating cavity, wherein the liquid level probe 40 is arranged opposite to the first accommodating cavity 21, and the quality probe 50 is arranged opposite to the second accommodating cavity 31; the control board 60 is electrically connected to the liquid level probe 40, and the control board 60 is electrically connected to the quality probe 50.

[0037] It can be understood that the urea solution can flow from the first through hole into the first receiving chamber 21 of the liquid pipe 20, the liquid level probe 40 is arranged opposite to the first receiving chamber 21, and can measure the liquid level in the first receiving chamber 21. The shaking during driving has little effect on the liquid level 100 in the first receiving chamber 21, and the liquid level 100 in the first receiving chamber 21 has good stability, which helps to improve the accuracy and reliability of liquid level measurement. The urea solution can flow from the second through hole into the second receiving chamber 31 of the liquid guide structure 30, and the quality probe 50 is arranged opposite to the second receiving chamber 31, and can measure the concentration of the solution in the second receiving chamber 31. At the same time, the liquid guide structure 30 also relatively reduces the risk of bubbles entering the concentration measurement area, which helps to improve the accuracy and reliability of concentration measurement, reduce measurement errors, and thus help the effective operation of the SCR system.

[0038] At the same time, by arranging the liquid level probe 40, the quality probe 50 and the control panel 60 in the accommodating cavity 11 of the base 10, the volume of the exhaust gas treatment sensor can be reduced as much as possible, thereby reducing the space required when the exhaust gas treatment sensor is applied to products or equipment, so that the exhaust gas treatment sensor can be applied to small products or equipment and has a wide range of applications.

[0039] In some embodiments, the liquid pipe 20 and the liquid guiding structure 30 are arranged perpendicular to each other. On the one hand, this makes the structure of the exhaust gas treatment sensor more compact, thereby reducing the volume of the exhaust gas treatment sensor; on the other hand, it can reduce the interference between the liquid pipe 20 and the liquid guiding structure 30, which helps to improve the accuracy and reliability of detection.

[0040] In some embodiments, the control board 60 is electrically connected to the liquid level probe 40 via a first wire, and the control board 60 is electrically connected to the quality probe 50 via a second wire.

[0041] In some embodiments, the liquid level probe 40 includes a first transducer 41, which is used to transmit ultrasonic waves on a side facing the liquid pipe 20. The quality probe 50 includes a second transducer 51, which is used to transmit ultrasonic waves on a side facing the liquid guide structure 30.

[0042] When measuring the liquid level, the first transducer 41 emits an ultrasonic wave toward one side of the liquid tube 20, and the emitted ultrasonic wave propagates in the liquid tube 20; when encountering the liquid surface 100, the ultrasonic wave will be reflected back, and the reflected ultrasonic wave will be received by the first transducer 41 again and converted into an electrical signal; the control board 60 receives and processes the electrical signal transmitted by the first transducer 41, and the control board 60 transmits the data to the external device terminal to calculate the liquid level height. When measuring the concentration, the second transducer 51 emits an ultrasonic wave toward one side of the liquid guide structure 30, and the emitted ultrasonic wave propagates in the liquid guide structure 30, and the second transducer 51 receives the reflected ultrasonic wave and converts it into an electrical signal; the control board 60 receives and processes the electrical signal transmitted by the second transducer 51, and the control board 60 transmits the data to the external device terminal to calculate the concentration of the liquid. The exhaust gas treatment sensor provided in the present application realizes non-contact measurement, which is conducive to extending the service life of the exhaust gas treatment sensor.

[0043] In some embodiments, the liquid level probe 40 further includes a first sound absorbing member 42, which covers the non-ultrasonic emission surface of the first transducer 41, that is, except for the surface facing the liquid pipe 20, all outer surfaces of the first transducer 41 are covered with the first sound absorbing member 42, so as to reduce the interference of clutter signals and improve the accuracy and reliability of the exhaust gas treatment sensor when measuring the liquid level. In some embodiments, the quality probe 50 further includes a second sound absorbing member 52, which covers the non-ultrasonic emission surface of the second transducer 51, that is, except for the surface facing the liquid guide structure 30, all outer surfaces of the second transducer 51 are covered with the second sound absorbing member 52, so as to reduce the interference of clutter signals and improve the accuracy and reliability of the exhaust gas treatment sensor when measuring the concentration.

[0044] In some embodiments, the first sound absorbing member 42 and the second sound absorbing member 52 are both damping rubbers. In other embodiments, the first sound absorbing member 42 and the second sound absorbing member 52 may also be other objects that can reduce interference from clutter signals, and the present invention is not limited thereto.

[0045] In some embodiments, the accommodating chamber 11 is provided with a first chamber and a second chamber, the first chamber is arranged opposite to the first accommodating chamber 21, and the liquid level probe 40 is arranged in the first chamber; the second chamber is arranged opposite to the second accommodating chamber 31, and the quality probe 50 is arranged in the second chamber. By arranging the liquid level probe 40 and the quality probe 50 in different chambers of the accommodating chamber 11, the mutual interference between the liquid level probe 40 and the quality probe 50 can be avoided, thereby improving the detection accuracy and reliability of the exhaust gas treatment sensor.

[0046] In some embodiments, the liquid pipe 20 includes a first sleeve 22 and a second sleeve 23, one end of the first sleeve 22 is disposed on the base 10 and is disposed opposite to the liquid level probe 40. At least part of the second sleeve 23 is inserted into the end of the first sleeve 22 away from the base 10, and the inner cavity of the second sleeve 23 is connected to the inner cavity of the first sleeve 22 to form a first accommodating cavity 21.

[0047] In some embodiments, the first sleeve 22 and the second sleeve 23 are detachably connected. When the second sleeve 23 is damaged or needs maintenance, the second sleeve 23 can be removed from the first sleeve 22 for maintenance or direct replacement, which helps to extend the service life of the exhaust gas treatment sensor.

[0048] In some embodiments, an annular slot is formed on the inner wall of the end of the first sleeve 22 away from the base 10, and the second sleeve 23 is inserted into the annular slot. The annular slot provides a clear insertion position for the second sleeve 23, ensuring that the second sleeve 23 and the first sleeve 22 can be accurately aligned when connected. In addition, the contact area between the second sleeve 23 and the first sleeve 22 is increased, thereby improving the connection stability of the second sleeve 23 and the first sleeve 22.

[0049] In some embodiments, the inner diameter of the first accommodating chamber 21 of the liquid tube 20 is 5 mm to 15 mm, including but not limited to: 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm and 15 mm. For example, in this embodiment, the inner diameter of the first accommodating chamber 21 of the liquid tube 20 is 10 mm; the first accommodating chamber 21 with a smaller inner diameter makes the liquid surface 100 in the first accommodating chamber 21 form a downward arc surface under the action of surface tension, and this arc surface reduces the transmission of ultrasonic energy, making the generated echo larger and more stable, and the echo signal is easier to be captured and processed by the control board 60.

[0050] When the liquid level 100 in the first accommodating chamber 21 tilts, similarly, due to the tension between the tube wall of the liquid tube 20 and the liquid, the curved liquid level 100 shakes less and does not produce a large tilt angle, so that there is always a stable reflection surface liquid level 100 in the first accommodating chamber 21, and the echo signal is more easily captured and processed by the circuit board, so that the liquid level 100 can replace the float, and the liquid level can still be accurately measured without using the float. In addition, by using ultrasonic waves to directly measure inside the first accommodating chamber 21 of the liquid tube 20, ultrasonic waves can easily form plane waves inside the liquid tube 20, which can achieve the purpose of increasing the echo angle.

[0051] In some embodiments, the inner diameter of the first sleeve 22 and the inner diameter of the second sleeve 23 are equal, both of which are 5mm to 15mm. The smaller inner diameter of the first sleeve 22 and the second sleeve 23 makes the liquid surface 100 in the liquid tube 20 arc-shaped under the action of surface tension. When the exhaust gas treatment sensor is tilted, the liquid surface 100 in the liquid tube 20 will not produce a large inclination angle, thereby ensuring the relative stability of the liquid surface 100, helping to reduce the measurement error caused by the tilt, and improving the accuracy of the liquid level measurement. At the same time, the smaller inner diameter of the first sleeve 22 and the second sleeve 23 limits the lateral diffusion of the ultrasonic wave, so that the ultrasonic wave can be more concentrated in the first accommodating chamber 21. The ultrasonic wave is easy to form a plane wave in the first sleeve 22 and the second sleeve 23 with a smaller inner diameter, and the ultrasonic wave will be reflected when it encounters the inner wall of the first accommodating chamber 21, which helps to increase the angle and stability of the echo signal, thereby improving the measurement accuracy and reliability. The exhaust gas treatment sensor provided in the present application can still ensure the accuracy of the measurement without using a float, while also reducing the product cost.

[0052] Please also read Figure 3 and Figure 4 , Figure 3 FIG. 1 shows a schematic diagram of the structure of a sheath 70 in an exhaust gas treatment sensor in an embodiment of the present application. Figure 4A schematic cross-sectional view of a sheath 70 in an exhaust gas treatment sensor in an embodiment of the present application is shown. In some embodiments, the exhaust gas treatment sensor further includes a sheath 70; the sheath 70 includes a first sheath 71, a second sheath 72, and a third sheath 73, the first sheath 71 is sleeved on the outside of the liquid guide structure 30; the second sheath 72 is sleeved on the outside of the connection between the first sleeve 22 and the second sleeve 23, and is used to strengthen the connection stability of the first sleeve 22 and the second sleeve 23, so as to improve the overall structural stability of the liquid pipe 20; the third sheath 73 is sleeved on the outside of the base 10, the end of the second sheath 72 close to the base 10 extends in the direction close to the base 10, and is connected to the third sheath 73, and the end of the first sheath 71 close to the base 10 extends in the direction close to the base 10, and is connected to the third sheath 73. In this embodiment, the first sheath 71, the second sheath 72, and the third sheath 73 are integrally formed.

[0053] The first set 71 is provided with a liquid inlet hole 711 and a discharge hole 712, both of which are connected to the second accommodating chamber 31. The liquid inlet hole 711 is used to guide external liquid into the first set 71, and the discharge hole 712 is used to guide bubbles to be discharged from the outside. When measuring the concentration, the height of the discharge hole 712 of the first set 71 relative to the liquid surface 100 is higher than the height of the liquid inlet hole 711 relative to the liquid surface 100, and the external liquid flows into the first set 71 from the liquid inlet hole 711 of the first set 71, and then flows into the second accommodating chamber 31 from the second through hole of the liquid guide structure 30; and the bubbles that enter the first set 71 together with the external liquid have a lower density than the liquid, and under the action of buoyancy, the bubbles can be discharged from the outside through the discharge hole 712, thereby preventing the bubbles from entering the liquid guide structure 30, reducing the influence of the bubbles in the liquid on the detection results, and improving the detection accuracy and reliability of the exhaust gas treatment sensor.

[0054] In some embodiments, the first set 71 is provided with a plurality of discharge holes 712. When measuring the concentration, the heights of the plurality of discharge holes 712 relative to the liquid surface 100 are all higher than the heights of the liquid inlet holes 711 relative to the liquid surface 100. In some embodiments, the first set 71 is provided with a plurality of liquid inlet holes 711, which are arranged in a row, which helps to improve the efficiency of the external liquid flowing into the first set 71. In addition, at least one liquid inlet hole 711 is arranged opposite to the second through hole of the liquid guiding structure 30, which reduces the obstruction of the external liquid flowing into the second receiving cavity 31 of the liquid guiding structure 30, making the flow path of the external liquid smoother. When measuring, the external liquid can enter the second receiving cavity 31 of the liquid guiding structure 30 more quickly, thereby improving the detection efficiency.

[0055] In some embodiments, the exhaust gas treatment sensor further includes a reflector 80, which is disposed in the second accommodating cavity 31 and is located at an end of the liquid guide structure 30 away from the base 10. The reflector 80 includes a reflective surface (not shown), which faces the quality probe 50. When measuring the concentration, the quality probe 50 emits ultrasonic waves toward one side of the liquid guide structure 30, and the reflective surface receives and efficiently reflects the ultrasonic waves, which helps to improve the sensitivity and accuracy of concentration detection.

[0056] The exhaust gas treatment sensor provided by the present application has a compact structure, which greatly reduces the space required when the exhaust gas treatment sensor is applied to products, so that the exhaust gas treatment sensor can be applied to small products or equipment with a relatively compact volume, with a wide range of applications and strong practicality. At the same time, the liquid level measurement and concentration measurement of the exhaust gas treatment sensor are highly accurate and reliable, which contributes to the effective operation of the SCR system.

[0057] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0058] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. An exhaust gas treatment sensor, characterized in that: The exhaust gas treatment sensor comprises: A base is provided with a receiving cavity; A liquid pipe is arranged on the base and has a first accommodating cavity. The liquid pipe also has a first through hole communicating with the first accommodating cavity so as to allow external liquid to enter the first accommodating cavity. a liquid guiding structure, which is arranged on the base and has a second accommodating cavity; the liquid guiding structure also has a second through hole communicating with the second accommodating cavity, so as to allow external liquid to enter the second accommodating cavity; A liquid level probe is disposed in the accommodating cavity and is arranged opposite to the first accommodating cavity; A quality probe is disposed in the accommodating cavity and is disposed opposite to the second accommodating cavity; and A control board is arranged in the accommodating cavity, and the control board is electrically connected to the liquid level probe and the quality probe.

2. The exhaust gas treatment sensor according to claim 1, characterized in that: The inner diameter of the first accommodating cavity of the liquid tube is 5 mm to 15 mm.

3. The exhaust gas treatment sensor according to claim 1, characterized in that: The liquid pipe includes a first sleeve and a second sleeve, one end of the first sleeve is arranged on the base and is arranged opposite to the liquid level probe; at least a part of the second sleeve is inserted into the end of the first sleeve away from the base, and the inner cavity of the second sleeve is connected with the inner cavity of the first sleeve to form the first accommodating cavity.

4. The exhaust gas treatment sensor according to claim 3, characterized in that: An annular slot is formed on the inner wall of one end of the first sleeve away from the base, and the second sleeve is inserted into the annular slot.

5. The exhaust gas treatment sensor according to claim 3, characterized in that: The exhaust gas treatment sensor further comprises a first set, which is sleeved on the outside of the liquid guiding structure; the first set is provided with a liquid inlet hole and a liquid outlet hole, and both the liquid inlet hole and the liquid outlet hole are connected to the second accommodating cavity.

6. The exhaust gas treatment sensor according to claim 5, characterized in that: The exhaust gas treatment sensor further includes a second set of sleeves, and the second set of sleeves is sleeved outside the connection between the first sleeve and the second sleeve.

7. The exhaust gas treatment sensor according to claim 1, characterized in that: The exhaust gas treatment sensor further includes a reflector, which is disposed in the second accommodating cavity and located at an end of the liquid guiding structure away from the base.

8. The exhaust gas treatment sensor according to claim 1, characterized in that: The accommodating cavity is provided with a first chamber opposite to the first accommodating cavity and a second chamber opposite to the second accommodating cavity. The liquid level probe is arranged in the first chamber, and the quality probe is arranged in the second chamber.

9. The exhaust gas treatment sensor according to claim 1, characterized in that: The liquid level probe comprises a first transducer, and a side of the first transducer facing the liquid pipe is used to emit ultrasonic waves; the quality probe comprises a second transducer, and a side of the second transducer facing the liquid guide structure is used to emit ultrasonic waves.

10. The exhaust gas treatment sensor according to claim 9, characterized in that: The liquid level probe further includes a first sound absorbing member, which covers the non-ultrasonic emission surface of the first transducer; the quality probe further includes a second sound absorbing member, which covers the non-ultrasonic emission surface of the second transducer.

Images