Urea concentration measuring device and monitoring system

Abstract

The utility model relates to the technical field of vehicle control, and discloses a urea concentration measuring device and a monitoring system.The device comprises a urea concentration sensor and a urea box, a urea solution is stored in the urea box, and the urea concentration sensor is arranged in the urea box and comprises a measuring probe; the measuring probe comprises at least one measuring rod, a fixed seat arranged at one end of the measuring rod and a magnet seat arranged at the other end of the measuring rod, a spring is arranged on the fixed seat, the extension direction of the spring is parallel to the axial direction of the measuring rod, each measuring rod is sleeved with a cleaning brush, and the cleaning brush comprises a metal shell. The cleaning brush is used for removing urea bubbles attached to the measuring rod in the moving process, the moving process is formed under the action of the magnet base and the spring, in the urea concentration measuring process, the urea bubbles attached to the measuring rod are removed through the cleaning brush, the urea concentration measuring precision can be improved, torque and speed limiting of a vehicle is avoided, and the attendance rate of the vehicle is increased.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of vehicle control, and provides a urea concentration measuring device and a monitoring system. BACKGROUND

[0002] At present, a urea injection system is needed for a non-four diesel engine of a national VI standard to reduce nitrogen oxide emission of the diesel engine, so as to achieve the purpose of reducing emission pollution. In the above process, it is needed to monitor whether the urea concentration is qualified. If the urea concentration is too low, the vehicle will be limited in torque and speed. However, in the actual measurement process of the urea concentration, bubbles are often attached to the urea concentration sensor, thereby affecting the measurement accuracy of the urea concentration, causing the vehicle controller to make a wrong judgment, and even causing the vehicle to be limited in torque and speed. CONTENT OF THE UTILITY MODEL

[0003] The application provides a urea concentration measuring device and a monitoring system, so as to improve the measurement accuracy of the urea concentration, avoid the vehicle being limited in torque and speed, and improve the attendance rate of the vehicle.

[0004] The specific technical scheme provided by the application is as follows:

[0005] In a first aspect, the application provides a urea concentration measuring device, comprising a urea concentration sensor and a urea tank, wherein the urea tank stores urea solution, and the urea concentration sensor is arranged in the urea tank.

[0006] The urea concentration sensor comprises a measuring probe.

[0007] The measuring probe comprises at least one measuring rod, a fixed seat arranged at one end of the measuring rod, and a magnet seat arranged at the other end of the measuring rod, the fixed seat is provided with a spring, and the extension direction of the spring is parallel to the axial direction of the measuring rod.

[0008] A cleaning brush is sleeved on each measuring rod, the cleaning brush comprises a metal shell, and the cleaning brush is used for removing urea bubbles attached to the measuring rod in a movement process, wherein the movement process is formed under the action of the magnet seat and the spring.

[0009] Optionally, the cleaning brush further comprises a plurality of bristles, one end of the bristle is connected with the shell, and the other end of the bristle is attached to the measuring rod.

[0010] Optionally, one end of the spring is detachably connected with the fixed seat, and the other end of the spring is detachably connected with the shell.

[0011] Optionally, the magnet seat is used for generating an electromagnetic force under the condition of being electrified, and the electromagnetic force is used for driving the cleaning brush and the spring to move.

[0012] Optionally, the metal material comprises one of the following materials: iron, cobalt and nickel.

[0013] Optionally, the urea concentration sensor further comprises a measuring body fixedly connected with the measuring probe.

[0014] The measuring body is used for converting the urea solution value collected by the measuring probe into a concentration value, wherein the concentration value is an electrical signal.

[0015] Optionally, the electromagnetic valve is electrically connected with the magnet base.

[0016] The magnet base is used for generating an electromagnetic force when the electromagnetic valve is powered on, so that the cleaning brush moves from one end of the measuring rod to the other end of the measuring rod under the action of the electromagnetic force.

[0017] The spring is used for moving the cleaning brush from the other end of the measuring rod to the one end of the measuring rod when the electromagnetic valve is powered off.

[0018] Optionally, the central processing unit is connected with the urea concentration sensor and the electromagnetic valve.

[0019] The central processing unit is used for comparing the size between the concentration value collected by the urea concentration sensor and a standard concentration value; connecting the electromagnetic valve and the external power supply end to power on the electromagnetic valve when the concentration value is less than the standard concentration value; and disconnecting the electromagnetic valve and the external power supply end to power off the electromagnetic valve when the concentration value reaches the standard concentration value.

[0020] Optionally, the number of urea concentration sensors is the same as the number of measuring rods.

[0021] In the second aspect, the embodiments of the present application further provide a urea concentration monitoring system, comprising: an electronic control unit (ECU) and the urea concentration measuring device of any one of the above.

[0022] The urea concentration measuring device is used for sending the concentration value of the urea solution in the urea tank to the ECU for display.

[0023] The present application has the following advantages:

[0024] In summary, the urea concentration measuring device and monitoring system provided in the embodiments of the present application, the device comprises: a urea concentration sensor and a urea tank, wherein the urea tank stores urea solution, the urea concentration sensor is arranged in the urea tank, the urea concentration sensor comprises a measuring probe, the measuring probe comprises at least one measuring rod, a fixed seat arranged at one end of the measuring rod and a magnet seat arranged at the other end of the measuring rod, a spring is arranged on the fixed seat, the extension direction of the spring is parallel to the axial direction of the measuring rod, a cleaning brush is respectively sleeved on each measuring rod, the cleaning brush comprises a metal shell, the cleaning brush is used to remove urea bubbles attached to the measuring rod during movement, the movement is formed under the action of the magnet seat and the spring, and the urea bubbles attached to the measuring rod are removed by the cleaning brush during the urea concentration measuring process, so that the measuring precision of the urea concentration can be improved, the vehicle torque and speed limit can be avoided, and the attendance rate of the vehicle is improved.

[0025] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the present application. The objects and other advantages of the present application can be achieved and obtained by the structure particularly pointed out in the written description, claims, and drawings. BRIEF DESCRIPTION OF DRAWINGS

[0026] The drawings described herein are intended to provide further understanding of the present application, and constitute a part of the present application. The schematic embodiments of the present application and the description thereof are used to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0027] Figure 1 It is a structural schematic view of a measuring probe in the embodiments of the present application;

[0028] Figure 2 It is a front view of a measuring probe in the embodiments of the present application;

[0029] Figure 3 It is a structural schematic view of a cleaning brush in the embodiments of the present application;

[0030] Figure 4 It is a connection schematic view of the inside of a urea concentration measuring device in the embodiments of the present application;

[0031] Figure 5 It is a connection schematic view of a urea concentration monitoring system in the embodiments of the present application. DETAILED DESCRIPTION

[0032] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the present application will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments described in the present application document, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the technical solutions of the present application.

[0033] The terms "first", "second", and the like in the description, claims, and drawings of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0034] The preferred embodiments of the present application will be described in detail below in conjunction with the accompanying drawings.

[0035] In the embodiments of the present application, a urea concentration measuring device 10 specifically comprises a urea concentration sensor 100 and a urea tank, wherein the urea tank stores urea solution, and the urea concentration sensor 100 is arranged in the urea tank.

[0036] After the engine of the vehicle is started, the urea concentration of the urea solution in the urea tank is monitored in real time by the urea measuring device. The urea solution in the present application is stored in the interior of the urea tank, and the capacity value of the urea solution changes with the actual use scenario. In order to measure the above-mentioned urea concentration, the urea concentration sensor 100 needs to be arranged in the urea tank, and preferably, the urea concentration sensor 100 is completely arranged in the urea solution.

[0037] In the embodiments of the present application, the urea concentration sensor 100 comprises a measuring probe.

[0038] Referring to Figure 1 As shown in the figure, the measuring probe comprises at least one measuring rod 01, a fixed seat 02 arranged at one end of the measuring rod 01, and a magnet seat 03 arranged at the other end of the measuring rod 01.

[0039] That is, the above-mentioned measuring probe comprises the fixed seat 02 and the magnet seat 03 arranged at two ends respectively, and a plurality of measuring rods 01 connected between the fixed seat 02 and the magnet seat 03. In an embodiment, one end of the measuring rod 01 is arranged perpendicularly to the fixed seat 02, and the other end of the measuring rod 01 is arranged perpendicularly to the magnet seat 03. In order to make the measurement accuracy higher, the measuring rods 01 are arranged staggered with each other, and each measuring rod 01 is arranged parallel to each other. The other arrangements of the above-mentioned measuring rod 01, fixed seat 02 and magnet seat 03 are the same as the related art, and will not be described here.

[0040] Referring to Figure 2 As shown in the figure, the fixed seat 02 is provided with a spring 04, and the extension direction of the spring 04 is parallel to the axial direction of the measuring rod 01.

[0041] In order to drive the cleaning brush 05 to remove urea bubbles during movement, in the embodiment of the application, the fixed seat 02 is provided with a spring 04, and the number of the spring 04 is the same as that of the measuring rod 01, and the extension direction of the spring 04 is parallel to the axial direction of the measuring rod 01, so as to drag the cleaning brush 05 to move.

[0042] Preferably, one end of the spring 04 is detachably connected with the fixed seat 02, and the other end of the spring 04 is detachably connected with the shell 051.

[0043] Considering that the extension degree of the spring 04 will age with the extension of the use time, in order to facilitate the subsequent replacement of the spring 04, one end of the spring 04 is detachably connected with the fixed seat 02, and the other end of the spring 04 is detachably connected with the shell 051 of the cleaning brush 05. The specific implementation mode of the detachable connection is not limited.

[0044] It should be noted that in addition to the measuring probe, the urea concentration sensor 100 also includes a measuring body, and the measuring body is fixedly connected with the measuring probe.

[0045] The measuring body is used to convert the urea solution value collected by the measuring probe into a concentration value, wherein the concentration value is an electrical signal.

[0046] In order to measure the urea concentration of the urea solution in the urea tank, the above-mentioned urea concentration sensor 100 further includes a measuring body in addition to the measuring probe. During the measurement, the above-mentioned probe is used to collect the urea solution value in the urea tank, that is, the probe collects the physical data of the urea solution value. Preferably, in order to accurately measure the above-mentioned urea solution value, the above-mentioned urea concentration sensor 100 is usually vertically arranged in the urea tank, so as to ensure that the measuring probe can be completely immersed in the urea solution.

[0047] During the implementation process, the measuring body converts the above-mentioned collected urea solution value into a concentration value, that is, converts the above-mentioned physical data into a concentration value, and further, the concentration value is transmitted to other devices at the back end for processing.

[0048] Referring to Figure 2 and Figure 3 As shown in the figure, each measuring rod 01 is provided with a cleaning brush 05, and the cleaning brush 05 includes a metal shell 051. The cleaning brush 05 is used to remove urea bubbles attached to the measuring rod 01 during movement, wherein the movement is formed under the action of the magnet seat 03 and the spring 04.

[0049] Considering that there are often bubbles in the urea solution, the bubbles adhere to the measuring probe, thereby affecting the measurement accuracy of the urea concentration. Based on this, in the embodiments of the present application, a cleaning brush 05 is provided for each measuring rod 01, and in the process of collecting the urea solution value by the measuring probe, the movement of the cleaning brush 05 on the measuring rod 01 is used to eliminate the above-mentioned bubbles.

[0050] It should be noted that the cleaning brush 05 includes a metal shell 051, and the specific shape and size of the shell 051 can be flexibly set according to the actual scene. The metal material includes one of the following materials: iron, cobalt, nickel. The function of the shell 051 is mainly to drive the cleaning brush 05 to move under the action of the magnet seat and the spring 04.

[0051] Referring to Figure 3 The cleaning brush 05 further includes a plurality of bristles 052, wherein one end of the bristle 052 is connected with the shell 051, and the other end of the bristle 052 is attached to the measuring rod 01.

[0052] In the embodiments of the present application, the cleaning brush 05 includes a plurality of bristles 052 in addition to the shell 051, and the number and material of the bristles 052 are not limited, and preferably, the bristles 052 are adhesively connected with the shell 051, and the other end of the bristles 052 is attached to the measuring rod 01, thereby eliminating the bubbles adhering to the measuring rod 01 during movement.

[0053] Next, the magnet seat 03 will be introduced. The magnet seat 03 is used to generate electromagnetic force under the condition of being powered on, and the electromagnetic force is used to drive the cleaning brush 05 and the spring 04 to move.

[0054] During implementation, the magnet seat 03 can generate electromagnetic force when it is powered on, and the electromagnetic force attracts the shell 051 of the cleaning brush 05, thereby driving the cleaning brush 05 and the spring 04 to move towards the magnet seat 03, so that the bubbles on the measuring rod 01 can be eliminated during movement.

[0055] In addition, in order to accurately control the movement of the cleaning brush 05, the urea concentration measuring device 10 in the embodiments of the present application further includes an electromagnetic valve 200, and the electromagnetic valve 200 is electrically connected with the magnet seat 03.

[0056] The magnet seat 03 is used to generate electromagnetic force when the electromagnetic valve 200 is powered on, so that the cleaning brush 05 moves from one end of the measuring rod 01 to the other end of the measuring rod 01 under the action of the electromagnetic force.

[0057] In the embodiment of the present application, the electromagnetic valve 200 is usually connected with an external power supply end, that is, one end of the electromagnetic valve 200 is connected with the external power supply end, and the other end of the electromagnetic valve 200 is connected with the magnet base 03. In this way, when the electromagnetic valve 200 is turned on, the magnet base 03 is powered to generate an electromagnetic force, and then the cleaning brush 05 moves from one end of the measuring rod 01 to the other end of the measuring rod 01 under the action of the electromagnetic force; when the electromagnetic valve 200 is turned off, the magnet base 03 is powered off, and then the electromagnetic force disappears.

[0058] The spring 04 is used to move the cleaning brush 05 from the other end of the measuring rod 01 to the one end of the measuring rod 01 when the electromagnetic valve 200 is powered off.

[0059] When the electromagnetic valve 200 is powered off and the electromagnetic force disappears, the magnet base 03 can no longer attract the shell 051 of the cleaning brush 05. In this case, the spring 04 that has been stretched contracts to move the cleaning brush 05 from the other end of the measuring rod 01 to the one end of the measuring rod 01.

[0060] In the implementation process, the process of powering on and powering off of the electromagnetic valve 200 is repeated, so that the bristles 052 of the cleaning brush 05 move back and forth on the measuring rod 01, and the bubbles attached to the measuring rod 01 are eliminated more thoroughly.

[0061] In addition, referring to Figure 4 As shown in the figure, the urea concentration measuring device 10 also includes a central processing unit 300, which is connected with the urea concentration sensor 100 and the electromagnetic valve 200.

[0062] The central processing unit 300 is used to compare the size between the concentration value collected by the urea concentration sensor 100 and the standard concentration value; when the concentration value is less than the standard concentration value, the electromagnetic valve 200 is connected with the external power supply end to power on the electromagnetic valve 200; and when the concentration value reaches the standard concentration value, the electromagnetic valve 200 is disconnected with the external power supply end to power off the electromagnetic valve 200.

[0063] In the embodiment of the present application, the central processing unit 300 can be implemented by using a related chip of a single-chip microcomputer. The central processing unit 300 is mainly used to automatically control the connection between the external power supply end and the electromagnetic valve 200 according to the concentration value collected by the urea concentration sensor 100, so as to realize the control of the movement of the cleaning brush 05 through a circuit.

[0064] In the implementation process, a standard concentration value is pre-stored in the storage space of the central processing unit 300. The standard concentration value represents the corresponding concentration value of the measuring rod 01 without bubble interference or within an acceptable range. The central processing unit 300 compares the size between the concentration value collected by the urea concentration sensor 100 and the standard concentration value.

[0065] In one case, the concentration value is less than the standard concentration value, which means that the bubbles on the measuring rod 01 interfere with the measurement, resulting in a smaller concentration value. In this case, the central controller controls the electromagnetic valve 200 to be in communication with the external power supply, so that the electromagnetic valve 200 is powered to generate an electromagnetic force, which in turn drives the cleaning brush 05 to move to eliminate the bubbles on the measuring rod 01.

[0066] In another case, the concentration value reaches the standard concentration value, which means that the bubbles on the measuring rod 01 have little interference with the measurement, and the influence on the concentration value can be ignored. In this case, the central controller controls the electromagnetic valve 200 to be disconnected from the external power supply, so that the cleaning brush 05 stops moving after being reset by the spring 04.

[0067] In addition, in order to make the measurement of the urea concentration more accurate, the number of urea concentration sensors 100 is the same as the number of measuring rods 01. In this way, when multiple urea concentration sensors 100 all obtain concentration values, the central processor 300 can take the average of the above-mentioned multiple concentration values as the concentration value for comparison with the standard concentration value.

[0068] The process of repeatedly powering on and off the electromagnetic valve 200 can be controlled by the central processor 300. Preferably, the above-mentioned standard concentration value can be set as multiple standard concentration values of different sizes, for example, standard concentration value 1 is greater than standard concentration value 2, and standard concentration value 2 is greater than standard concentration value 3. In this way, when the concentration value collected by the urea concentration sensor 100 is less than the standard concentration value 3, the electromagnetic valve 200 can be controlled to be powered on to continue to remove the bubbles on the measuring rod 01; when the concentration value collected by the urea concentration sensor 100 reaches the standard concentration value 3 and is less than the standard concentration value 2, the electromagnetic valve 200 can be controlled to be powered on to continue to remove the bubbles on the measuring rod 01; when the concentration value collected by the urea concentration sensor 100 reaches the standard concentration value 2 and is less than the standard concentration value 1, the electromagnetic valve 200 can be controlled to be powered on to continue to remove the bubbles on the measuring rod 01; when the concentration value collected by the urea concentration sensor 100 reaches the standard concentration value 1, the electromagnetic valve 200 can be controlled to be powered off to stop removing the bubbles on the measuring rod 01.

[0069] In addition, referring to Figure 5 The embodiment of the present application provides a urea concentration monitoring system, which comprises an electronic control unit 20 (ECU) and the urea concentration measuring device 10 of any one of the above, and the urea concentration measuring device 10 is used to send the measured concentration value of the urea solution in the urea tank to the ECU for display.

[0070] In the implementation process, after the urea concentration measuring device 10 measures the concentration value of the urea solution in the urea tank, the concentration value is sent to the ECU for display, so that the relevant management personnel can add, stir and other operations to the urea solution in the urea tank in a timely manner according to the displayed concentration value.

[0071] To sum up, in the embodiment of the present application, a urea concentration measuring device and monitoring system are provided, which comprises a urea concentration sensor and a urea tank, wherein the urea tank stores urea solution, the urea concentration sensor is arranged in the urea tank, the urea concentration sensor comprises a measuring probe, the measuring probe comprises at least one measuring rod, a fixed seat arranged at one end of the measuring rod and a magnet seat arranged at the other end of the measuring rod, a spring is arranged on the fixed seat, the extension direction of the spring is parallel to the axial direction of the measuring rod, and a cleaning brush is sleeved on each measuring rod, the cleaning brush comprises a metal shell, the cleaning brush is used to remove urea bubbles attached to the measuring rod during movement, the movement is formed under the action of the magnet seat and the spring, and the urea bubbles attached to the measuring rod are removed by the cleaning brush during the urea concentration measurement, so as to improve the measurement accuracy of the urea concentration, avoid vehicle torque and speed limitation, and improve the attendance rate of the vehicle.

[0072] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system or a computer program product system. Therefore, the present application can adopt a completely hardware embodiment, a completely software embodiment or an embodiment combining software and hardware aspects. Moreover, the present application can adopt the form of a computer program product system implemented on one or more computer usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer usable program codes.

[0073] The present application is described with reference to flowcharts and / or block diagrams according to the method, equipment (system) and computer program product system of the present application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and the combination of the flows and / or blocks in the flowcharts and / or block diagrams can be realized by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing equipment to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing equipment produce a means for implementing the functions specified in the flowcharts and / or block diagrams. Figure 1 The means for implementing the functions specified in one or more flows and / or blocks. Figure 1 The means for implementing the functions specified in one or more flows and / or blocks.

[0074] These computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture including instructions which implement the flow Figure 1 The flow or flows and / or blocks Figure 1 The flow or flows and / or blocks

[0075] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions that execute on the computer or other programmable apparatus provide steps for implementing the flow Figure 1 The flow or flows and / or blocks Figure 1 The flow or flows and / or blocks

[0076] Obviously, numerous modifications and variations of the present application are possible in light of the above teachings. It is therefore to be understood that within the scope of the apparent, such modifications and variations are to be included within the scope of the application and the equivalent of such.

Claims

1. A urea concentration measuring device, characterized by, The application relates to a urea concentration sensor and a urea tank, wherein the urea tank stores urea solution, and the urea concentration sensor is arranged in the urea tank. The urea concentration sensor comprises a measuring probe. The measuring probe comprises at least one measuring rod, a fixed seat arranged at one end of the measuring rod, and a magnet seat arranged at the other end of the measuring rod, wherein a spring is arranged on the fixed seat, and the extending direction of the spring is parallel to the axial direction of the measuring rod. A cleaning brush is arranged on each measuring rod, wherein the cleaning brush comprises a metal shell, and the cleaning brush is used for cleaning urea bubbles attached to the measuring rod during movement caused by the magnet seat and the spring. The cleaning brush further comprises a plurality of bristles, wherein one end of the bristles is connected with the shell, and the other end of the bristles is attached to the measuring rod.

2. The apparatus of claim 1, wherein, One end of the spring is detachably connected with the fixed seat, and the other end of the spring is detachably connected with the shell.

3. The apparatus of claim 1, wherein, The magnet seat is used for generating an electromagnetic force under the condition of being electrified, and the electromagnetic force is used for driving the cleaning brush and the spring to move.

4. The apparatus of claim 1, wherein, The metal material comprises one of iron, cobalt and nickel.

5. The device of any one of claims 1 to 4, wherein, The urea concentration sensor further comprises a measuring body, and the measuring body is fixedly connected with the measuring probe.

6. The apparatus of claim 1, wherein, The measuring body is used for converting the urea solution value collected by the measuring probe into a concentration value, wherein the concentration value is an electric signal. The application further comprises a solenoid valve, and the solenoid valve is electrically connected with the magnet seat.

7. The apparatus of claim 6, wherein, The magnet seat is used for generating an electromagnetic force when the solenoid valve is electrified, so that the cleaning brush moves from one end of the measuring rod to the other end of the measuring rod under the action of the electromagnetic force. The spring is used for moving the cleaning brush from the other end of the measuring rod to one end of the measuring rod when the solenoid valve is de-energized. The application further comprises a central processing unit, and the central processing unit is connected with the urea concentration sensor and the solenoid valve.

8. The apparatus of claim 7, wherein, The central processing unit is used for comparing the size of the concentration value collected by the urea concentration sensor and a standard concentration value, connecting the solenoid valve with an external power supply end to energize the solenoid valve when the concentration value is smaller than the standard concentration value, and disconnecting the solenoid valve from the external power supply end to de-energize the solenoid valve when the concentration value reaches the standard concentration value. The number of the urea concentration sensors is the same as the number of the measuring rods.

9. The apparatus of claim 1, wherein, The application relates to an electronic control unit (ECU) and a urea concentration measuring device as claimed in any one of claims 1 to 9.

10. A urea concentration monitoring system characterized by, The urea concentration measuring device is used for sending the concentration value of the urea solution in the urea tank to the ECU for display. ​ ​

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