A urea concentration sensor

Abstract

The utility model relates to urea concentration technical field, specifically a kind of urea concentration sensor, including fixed disc, the upper surface of the fixed disc is fixedly connected with communication module, the utility model can be through the accurate cooperation of urea quality sensor and processor, urea solution concentration can be quickly and accurately detected, simultaneously, urea pipeline and cooling liquid pipeline around the surface of processor, cooperate with heating plate and temperature sensor, the effective control to detection ambient temperature is realized, temperature sensor real-time monitoring temperature, signal transmission is carried out to controller by sensing wire, when temperature is abnormal, controller can control heating plate to carry out temperature rise by electric signal wire, or cooling liquid flow in cooling liquid pipeline is adjusted by cooling liquid inlet, cooling liquid return liquid port to carry out temperature drop, ensure that urea solution is at optimum detection temperature, avoid the detection error caused by temperature change, greatly improve the accuracy and stability of detection.

Description

Technical Field

[0001] This utility model relates to the field of urea concentration technology, specifically a urea concentration sensor. Background Technology

[0002] In vehicle exhaust aftertreatment systems, the concentration of urea solution plays a crucial role in the efficiency of selective catalytic reduction (SCR) reactions. Accurately detecting urea concentration is an important prerequisite for ensuring that exhaust emissions meet standards. However, the physicochemical properties of urea solution are significantly affected by temperature. Temperature changes can lead to changes in parameters such as solution density and conductivity, which in turn can cause measurement errors. Currently, most urea concentration sensors on the market employ temperature compensation mechanisms to reduce the impact of temperature changes on measurement results. A common approach is to collect temperature data using a temperature sensor and then correct it using a pre-set temperature-concentration compensation algorithm. However, these methods have limitations. On one hand, some sensors have relatively simple temperature compensation algorithms that cannot accurately match the temperature change characteristics of urea solutions under complex operating conditions. On the other hand, the temperature control structure design of the sensor is not reasonable enough, and the coordination between the coolant circulation and the heating device is poor, resulting in a lag in temperature regulation and making it difficult to quickly stabilize the urea solution within the optimal detection temperature range. This makes it difficult to effectively guarantee the accuracy and stability of the detection results. Therefore, we have developed a urea concentration sensor to address these issues. Utility Model Content

[0003] The purpose of this invention is to provide a urea concentration sensor to solve the problems mentioned in the background art.

[0004] The technical solution of this utility model is: a urea concentration sensor, including a fixed plate, a communication module fixedly connected to the upper surface of the fixed plate, a coolant return port fixedly connected to the right side wall of the communication module, a controller fixedly connected to the upper surface of the fixed plate, a coolant inlet, a urea inlet, and a urea outlet fixedly connected to the right side wall of the controller, a reflux device provided on the lower surface of the fixed plate, and a detection device provided on the lower surface of the fixed plate.

[0005] Preferably, the reflux device includes a urea pipe, which is fixedly connected to the lower surface of the fixed plate. The upper end of the urea pipe passes through the lower surface of the fixed plate and extends upward. The urea pipe is fixedly connected to the controller and is in communication with the controller.

[0006] Preferably, the detection device includes a coolant pipe, which is fixedly connected to the lower surface of a fixed plate. A processor is fixedly connected to the lower end of the coolant pipe. A urea quality sensor is fixedly connected to the lower surface of the processor. Heating plates are fixedly connected to the left and right side walls of the processor. A temperature sensor is fixedly connected to the surface of the processor. A sensing wire is fixedly connected to the upper surface of the temperature sensor. The upper end of the sensing wire extends through the lower surface of the fixed plate and upwards. The upper end of the sensing wire is fixedly connected to a controller. An electrical signal wire is fixedly connected to the upper surface of the processor. The other end of the electrical signal wire is fixedly connected to a plug.

[0007] Preferably, the urea pipe surrounds the surface of the processor and is fixedly connected to the processor.

[0008] Preferably, the upper end of the coolant pipe penetrates the lower surface of the fixed disk and extends upwards, the coolant pipe is connected to the controller, and the coolant pipe is connected to the processor.

[0009] Preferably, the processor is electrically connected to the electrical signal wire, the processor is electrically connected to the urea quality sensor, the processor is electrically connected to the heating plate, and the sensing wire is electrically connected to the controller.

[0010] This invention provides an improved urea concentration sensor, which has the following improvements and advantages compared with the prior art: Firstly, this invention, through the precise cooperation of a urea quality sensor and a processor, can quickly and accurately detect the concentration of urea solution. Simultaneously, the urea pipes and coolant pipes surrounding the processor surface, along with a heating plate and temperature sensor, effectively control the ambient temperature. The temperature sensor monitors the temperature in real time, and the sensing wire transmits the signal to the controller. When the temperature is abnormal, the controller can control the heating plate to raise the temperature via electrical signal wires, or adjust the coolant flow rate in the coolant pipes through the coolant inlet and outlet to lower the temperature, ensuring the urea solution is at the optimal detection temperature. This avoids detection errors caused by temperature changes and greatly improves the accuracy and stability of the detection.

[0011] Secondly, this utility model adopts a modular design, with clear division of labor and reasonable layout of functional modules such as the communication module and controller. The communication module can realize rapid communication with external devices, which facilitates the real-time transmission of detection data and provides convenience for subsequent processing. The controller integrates interfaces such as urea inlet, urea outlet, and coolant inlet, making it easier to connect the sensor to external pipelines and simplifying installation and maintenance. In addition, the components are connected by wires and pipes, resulting in a compact structure that not only saves installation space but also reduces the difficulty of troubleshooting and improves the overall ease of use and reliability. Attached Figure Description

[0012] The present invention will be further explained below with reference to the accompanying drawings and embodiments: Figure 1 This is a front view structural diagram of the present invention; Figure 2 This is a side view structural diagram of the present invention; Figure 3 This is a schematic diagram of the plug structure of this utility model; Explanation of reference numerals in the attached figures: 1. Fixed plate; 2. Communication module; 3. Coolant return port; 4. Controller; 5. Coolant inlet; 6. Urea inlet; 7. Urea outlet; 8. Urea pipe; 9. Coolant pipe; 10. Processor; 11. Urea quality sensor; 12. Heating plate; 13. Temperature sensor; 14. Sensor wire; 15. Electrical signal wire; 16. Plug. Detailed Implementation

[0013] The present invention will now be described in detail, and the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0014] This utility model provides an improved urea concentration sensor. The technical solution of this utility model is as follows: like Figure 1 - Figure 3 As shown, a urea concentration sensor includes a fixed plate 1. A communication module 2 is fixedly connected to the upper surface of the fixed plate 1. A coolant return port 3 is fixedly connected to the right side wall of the communication module 2. A controller 4 is fixedly connected to the upper surface of the fixed plate 1. A coolant inlet 5, a urea inlet 6, and a urea outlet 7 are fixedly connected to the right side wall of the controller 4. A reflux device is provided on the lower surface of the fixed plate 1. A detection device is provided on the lower surface of the fixed plate 1.

[0015] Furthermore, the reflux device includes a urea pipe 8, which is fixedly connected to the lower surface of the fixed plate 1. The upper end of the urea pipe 8 penetrates the lower surface of the fixed plate 1 and extends upwards. The urea pipe 8 is fixedly connected to the controller 4, and the urea pipe 8 is connected to the controller 4. The urea solution can flow in an orderly manner through the interface of the controller 4 and the urea pipe 8, ensuring that fresh urea solution always flows into the detection area. At the same time, it can promptly reflux the solution after detection, avoiding the urea solution from remaining or deteriorating in the sensor, effectively ensuring the consistency and accuracy of the test samples.

[0016] Furthermore, the detection device includes a coolant pipe 9, which is fixedly connected to the lower surface of the fixed plate 1. A processor 10 is fixedly connected to the lower end of the coolant pipe 9. A urea quality sensor 11 is fixedly connected to the lower surface of the processor 10. Heating plates 12 are fixedly connected to the left and right side walls of the processor 10. A temperature sensor 13 is fixedly connected to the surface of the processor 10. A sensing wire 14 is fixedly connected to the upper surface of the temperature sensor 13. The upper end of the sensing wire 14 extends through the lower surface of the fixed plate 1 and upwards. The upper end of the sensing wire 14 is connected to the controller. 4. Fixed connection: An electrical signal wire 15 is fixedly connected to the upper surface of the processor 10. The other end of the electrical signal wire 15 is fixedly connected to a plug 16. The temperature sensor 13 senses and detects the ambient temperature in real time. The heating plate 12 can adjust the temperature as needed. With the cooling effect of the coolant pipe 9, a stable working environment is created for the urea quality sensor 11. The sensing wire 14 and the electrical signal wire 15 ensure the rapid transmission of temperature signal and concentration detection signal, making the entire detection process efficient and accurate, reducing detection errors caused by environmental factors, and improving the overall performance of the sensor.

[0017] Furthermore, the urea pipe 8 surrounds the surface of the processor 10 and is fixedly connected to the processor 10. The design of the urea pipe 8 surrounding the processor 10 ensures that the urea solution flowing through the pipe is in close contact with the processor 10 and surrounding detection components. On the one hand, the heat generated by the processor 10 during operation can be used to preheat the urea solution, assisting the temperature control system in quickly adjusting the solution temperature to the optimal detection temperature. On the other hand, it ensures that the urea solution is evenly distributed in the detection area and makes full contact with the urea quality sensor 11, thereby improving the sensitivity and accuracy of detection and optimizing the temperature adaptability and detection effect of the sensor.

[0018] Furthermore, the upper end of the coolant pipe 9 penetrates the lower surface of the fixed plate 1 and extends upwards. The coolant pipe 9 is connected to the controller 4 and the processor 10. When the ambient temperature is too high, the controller 4 can control the coolant to flow in from the coolant inlet (5), quickly remove the heat of the processor 10 and surrounding components through the coolant pipe 9, and then flow out from the coolant return port (3), forming an effective heat dissipation cycle, accurately controlling the temperature of the detection area, preventing the performance and detection results of the urea quality sensor 11 from being affected by excessively high temperature, and ensuring the stable operation of the sensor in a high-temperature environment.

[0019] Furthermore, the processor 10 is electrically connected to the electrical signal wire 15, the processor 10 is electrically connected to the urea mass sensor 11, the processor 10 is electrically connected to the heating plate 12, and the sensor wire 14 is electrically connected to the controller 4. The processor 10 can receive the concentration detection data of the urea mass sensor 11 in real time, perform analysis and processing, and at the same time, based on the temperature signal transmitted from the temperature sensor 13 to the controller 4 through the sensor wire 14, the controller 4 issues instructions to control the working state of the heating plate 12 through the electrical signal wire 15.

[0020] Working principle: First, urea solution flows in from urea inlet 6 and is transported to the detection area via urea pipeline 8. Urea quality sensor 11 works with processor 10 to quickly and accurately determine the concentration of urea solution. Temperature sensor 13 monitors the detection environment temperature in real time, and sensor wire 14 transmits the temperature signal to controller 4. If the temperature is below the optimal range, controller 4 controls the heating plate 12 to heat up via electrical signal wire 15. If the temperature is too high, the flow rate of coolant in coolant pipeline 9 is adjusted through coolant inlet 5 and coolant return port 3 to cool down the temperature, ensuring a stable detection environment temperature and reducing the impact of temperature on the measurement results. After the detection is completed, the data is transmitted to controller 4 via sensor wire 14 and then quickly transmitted to external devices via communication module 2. Controller 4 integrates multiple interfaces to achieve convenient connection with external pipelines, ensuring the inflow and outflow of urea solution and the circulation of coolant, and maintaining stable operation of the sensor. The foregoing description enables those skilled in the art to implement or use this invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this invention. Therefore, this invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A urea concentration sensor, comprising a fixed disk (1), characterized in that: A communication module (2) is fixedly connected to the upper surface of the fixed disk (1). A coolant return port (3) is fixedly connected to the right side wall of the communication module (2). A controller (4) is fixedly connected to the upper surface of the fixed disk (1). A coolant inlet (5), a urea inlet (6), and a urea outlet (7) are fixedly connected to the right side wall of the controller (4). A reflux device is provided on the lower surface of the fixed disk (1). A detection device is provided on the lower surface of the fixed disk (1). The detection device includes a coolant pipe (9), which is fixedly connected to the lower surface of a fixed plate (1). A processor (10) is fixedly connected to the lower end of the coolant pipe (9). A urea quality sensor (11) is fixedly connected to the lower surface of the processor (10). Heating plates (12) are fixedly connected to the left and right side walls of the processor (10). A temperature sensor (13) is fixedly connected to the surface of the processor (10). A sensing wire (14) is fixedly connected to the upper surface of the temperature sensor (13). The upper end of the sensing wire (14) extends through the lower surface of the fixed plate (1) and upwards. The upper end of the sensing wire (14) is fixedly connected to a controller (4). An electrical signal wire (15) is fixedly connected to the upper surface of the processor (10). A plug (16) is fixedly connected to the other end of the electrical signal wire (15).

2. The urea concentration sensor according to claim 1, characterized in that: The reflux device includes a urea pipe (8), which is fixedly connected to the lower surface of the fixed plate (1). The upper end of the urea pipe (8) passes through the lower surface of the fixed plate (1) and extends upward. The urea pipe (8) is fixedly connected to the controller (4), and the urea pipe (8) is connected to the controller (4).

3. A urea concentration sensor according to claim 2, characterized in that: The urea pipe (8) surrounds the surface of the processor (10) and is fixedly connected to the processor (10).

4. A urea concentration sensor according to claim 3, characterized in that: The upper end of the coolant pipe (9) penetrates the lower surface of the fixed plate (1) and extends upwards. The coolant pipe (9) is connected to the controller (4) and the processor (10).

5. A urea concentration sensor according to claim 4, characterized in that: The processor (10) is electrically connected to the electrical signal wire (15), the processor (10) is electrically connected to the urea quality sensor (11), the processor (10) is electrically connected to the heating plate (12), and the sensing wire (14) is electrically connected to the controller (4).

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