Electric heating urea injection system and control method thereof

Abstract

The invention provides an electric heating urea injection system and a control method thereof, and relates to the technical field of tail gas treatment. The urea heating pipe is located on the first support, a liquid inlet of the urea heating pipe is used for being communicated with a liquid outlet pipeline of a urea tank, and a liquid outlet of the urea heating pipe is provided with a nozzle; the at least two heaters are arranged in the circumferential direction of the urea heating pipe and are arranged at the two ends of the urea heating pipe, so that the urea can form finer particles in the spraying process, the urea atomization quality is remarkably improved, the coverage range is remarkably widened, and the nitrogen-oxygen conversion efficiency of a post-treatment system is improved; and the crystallization risk of a post-treatment system is reduced, and the problem of poor urea spraying atomization under the working conditions of cold start and low exhaust temperature in the prior art is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of tail gas treatment, and in particular, to an electric heating urea injection system and a control method thereof. Background Art

[0002] The electric heating urea injection system is a key technology for improving the urea injection effect in the tail gas treatment system of diesel engines. During the selective catalytic reduction (SCR) process, the urea solution is injected into the high-temperature exhaust gas. Under the action of the catalyst, the ammonia (NH3) generated by the hydrolysis of urea reacts with nitrogen oxides (NOx) to be converted into harmless nitrogen (N2) and water (H2O). However, in the prior art, in a single-stage SCR system, under low-temperature cold start or low exhaust temperature conditions, the viscosity of the urea solution increases, the atomization effect becomes poor, affecting its sufficient reaction with nitrogen oxides, and thus resulting in ineffective conversion of nitrogen oxides and exceeding the tail gas emission standard. Summary of the Invention

[0003] The main object of the present invention is to provide an electric heating urea injection system and a control method thereof to solve the problem of poor urea injection atomization under cold start and low exhaust temperature conditions in the prior art.

[0004] To achieve the above object, according to one aspect of the present invention, there is provided an electric heating urea injection system. The electric heating urea injection system includes: a first bracket; a urea heating pipe located on the first bracket, an inlet of the urea heating pipe being used for communicating with an outlet pipe of a urea tank, and a nozzle being provided at an outlet of the urea heating pipe; at least two heaters arranged circumferentially along the urea heating pipe and provided at both ends of the urea heating pipe.

[0005] Further, the at least two heaters include a first heater and a second heater, the first heater and the second heater being respectively provided at both ends of the urea heating pipe, and the first heater and the second heater being used for heating the urea solution in the urea heating pipe.

[0006] Further, a rib structure is provided inside the urea heating pipe, the rib structure being spirally arranged along the inner wall of the urea heating pipe to form a spiral urea flow channel, and a through hole is provided on the urea heating pipe, the through hole being communicatively arranged with the spiral urea flow channel.

[0007] Further, the electric heating urea injection system further includes: a second bracket arranged circumferentially along the urea heating pipe and connected to the first bracket, the second bracket having a receiving cavity communicatively arranged with the through hole; a temperature sensor, a part of the temperature sensor being located in the receiving cavity and passing through the through hole, and the temperature sensor being used for collecting temperature information of the urea solution in the urea heating pipe.

[0008] Further, the electric heating urea injection system further includes: a liquid inlet joint, one end of the liquid inlet joint is connected to the liquid inlet of the urea heating pipe, and the other end of the liquid inlet joint is communicated with the liquid outlet pipe of the urea tank; a liquid outlet joint, one end of the liquid outlet joint is connected to the liquid outlet of the urea heating pipe, and the other end of the liquid outlet joint is connected to the nozzle.

[0009] According to another aspect of the present invention, a control method for an electric heating urea injection system is provided. The control method is used to control the electric heating urea injection system in the above embodiment. The control method includes: obtaining driving condition information of a target vehicle, and the driving condition information at least includes: cold start condition, low speed condition, medium speed condition, high speed condition; collecting temperature information of the urea solution in the urea tank; generating a control strategy based on at least one of the driving condition information and the temperature information, and the control strategy is used to control the opening or closing of the coolant valve, the first heater, and the second heater.

[0010] Further, generating a control strategy based on at least one of the driving condition information and the temperature information, and the control strategy is used to control the opening or closing of the coolant valve, the first heater, and the second heater, includes: in response to the target vehicle being in a cold start condition, generating a first control strategy in the control strategy, and the first control strategy is used to control the coolant valve to open, the first heater to open, and the second heater to open.

[0011] Further, generating a control strategy based on at least one of the driving condition information and the temperature information, and the control strategy is used to control the opening or closing of the coolant valve, the first heater, and the second heater, includes: in response to the target vehicle being in a low speed condition and the temperature information being less than a preset temperature, generating a first control strategy in the control strategy, and the first control strategy is used to control the coolant valve to open, the first heater to open, and the second heater to open; in response to the target vehicle being in a low speed condition and the temperature information being greater than or equal to the preset temperature, generating a second control strategy in the control strategy, and the second control strategy is used to control the coolant valve to close, the first heater to open, and the second heater to open.

[0012] Further, generating a control strategy based on at least one of the driving condition information and the temperature information, and the control strategy is used to control the opening or closing of the coolant valve, the first heater, and the second heater, includes: in response to the target vehicle being in a medium speed condition and the temperature information being less than a preset temperature, generating a third control strategy in the control strategy, and the third control strategy is used to control the coolant valve to open, the first heater to open, and the second heater to close; in response to the target vehicle being in a medium speed condition and the temperature information being greater than or equal to the preset temperature, generating a fourth control strategy in the control strategy, and the fourth control strategy is used to control the coolant valve to close, the first heater to open, and the second heater to close.

[0013] Further, based on at least one of the driving condition information and the temperature information, a control strategy is generated. The control strategy is used to control the opening or closing of a coolant valve, a first heater, and a second heater, and includes: in response to the target vehicle being in a high-speed driving condition, generating a fifth control strategy in the control strategy, where the fifth control strategy is used to control the coolant valve to open, the first heater to close, and the second heater to close; in response to the target vehicle being in a high-speed driving condition and the ambient temperature being greater than or equal to a preset temperature, generating a sixth control strategy in the control strategy, where the sixth control strategy is used to control the coolant valve to close, the first heater to close, and the second heater to close, where the ambient temperature is used to represent the atmospheric temperature.

[0014] Applying the technical solution of the present invention, by arranging at least two heaters circumferentially along the urea heating pipe and distributing them at both ends of the heating pipe, the phenomenon of local overheating that may be caused by a traditional single heating source can be effectively avoided, ensuring that the urea solution is uniformly heated in the urea heating pipe. The heated urea solution is sprayed through a nozzle located at the liquid outlet of the urea heating pipe. The high temperature increases the vapor pressure of the urea solution, enabling the urea to form finer particles during the spraying process, significantly improving the quality and coverage range of urea atomization, enhancing the nitrogen oxide conversion efficiency of the aftertreatment system, reducing the crystallization risk of the aftertreatment system, and reducing the content of harmful substances in the emissions. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The specification drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0016] Figure 1 shows a schematic diagram of the principle of an electrically heated urea injection system according to the present invention;

[0017] Figure 2 shows a schematic structural diagram of an electrically heated urea injection system according to the present invention;

[0018] Figure 3 shows a schematic structural diagram of a nozzle of an electrically heated urea injection system according to the present invention;

[0019] Figure 4 shows a schematic structural diagram of a urea heating pipe of an electrically heated urea injection system according to the present invention;

[0020] Figure 5 shows a schematic flow diagram of a control method for an electrically heated urea injection system according to the present invention.

[0021] Among them, the above-mentioned drawings include the following reference numerals:

[0022] 10. First bracket; 11. Bolt;

[0023] 20. Urea heating tube; 21. Rib structure; 22. Through hole;

[0024] 30. Heater; 31. First heater; 32. Second heater;

[0025] 40. Nozzle; 41. Nozzle joint; 42. Sealing ring;

[0026] 50. Liquid inlet joint;

[0027] 60. Liquid outlet joint;

[0028] 70. Second bracket; 71. Accommodating cavity;

[0029] 80. Temperature sensor. Specific embodiments

[0030] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0031] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0032] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and do not necessarily need to describe a specific order or sequence. It should be understood that such terms can be interchanged under appropriate circumstances so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products, or devices.

[0033] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many different forms and should not be construed as being limited only to the embodiments set forth herein. It should be understood that these embodiments are provided so that the disclosure of the present application is thorough and complete, and the concept of these exemplary embodiments is fully conveyed to those of ordinary skill in the art. In the drawings, for clarity, the thickness of layers and regions may be exaggerated, and the same reference numerals are used to denote the same devices, and thus their description will be omitted.

[0034] It should be noted that during the operation of the diesel engine, the exhaust gas is discharged through the exhaust pipe. The urea injection system injects an aqueous urea solution into the exhaust gas flow at an appropriate position. By means of selective catalytic reduction (SCR) technology, ammonia generated by the decomposition of urea at high temperature reacts with NOx in the exhaust gas and converts it into harmless nitrogen and water, thereby reducing emission pollution.

[0035] Figure 1 This is a schematic diagram of the principle of the electric heating urea injection system of the present invention. Different heating modes are proposed for different driving conditions to reduce the system energy consumption. There are mainly three control actuators, namely, the coolant inlet valve in front of the urea tank and the pre-stage dual-temperature heater. The ECU monitors the urea temperature in the urea tank, controls the opening and closing of the coolant valve, and uses the heat of the coolant after the engine warms up to heat the urea solution in the urea tank and the urea supply metal pipe through the coolant pipeline that penetrates into the urea tank, so as to keep the outlet temperature of the urea tank maintained at 30 ± 10°C. The efficiency of heating the urea solution by the coolant is low, and the dual-temperature heater needs to be turned on according to different working conditions. The ECU monitors data such as vehicle speed and torque to judge the type of the vehicle driving condition. According to different working conditions, it controls the opening and closing of the pre-stage dual-temperature heater, seeks coordination between the system energy consumption and the heating efficiency, improves the energy conversion efficiency, better improves the atomization quality of the urea solution, enhances the nitrogen oxide conversion efficiency of the post-processor under cold conditions, reduces the crystallization risk of the post-processor, and improves the reliability of the post-treatment system.

[0036] Combined with Figures 2 to 4 As shown, according to a specific embodiment of the present invention, an electric heating urea injection system is provided.

[0037] Specifically, as Figure 1 shown, an electric heating urea injection system includes: a first bracket 10; a urea heating pipe 20, the urea heating pipe 20 is located on the first bracket 10, the liquid inlet of the urea heating pipe 20 is used for communicating with the liquid outlet pipeline of the urea tank, and a nozzle 40 is provided at the liquid outlet of the urea heating pipe 20; at least two heaters 30, the at least two heaters 30 are arranged along the circumferential direction of the urea heating pipe 20, and the at least two heaters 30 are arranged at both ends of the urea heating pipe 20.

[0038] In this embodiment, at least two heaters 30 are arranged circumferentially along the urea heating pipe 20 and distributed at both ends of the heating pipe, which can effectively avoid the local overheating phenomenon that may be caused by a traditional single heat source, ensure that the urea solution is uniformly heated in the urea heating pipe 20, and the heated urea solution is sprayed through a nozzle 40 located at the liquid outlet of the urea heating pipe 20. The high temperature increases the vapor pressure of the urea solution, enabling the urea to form finer particles during spraying, significantly improving the quality and coverage range of urea atomization, enhancing the nitrogen oxide conversion efficiency of the aftertreatment system, reducing the crystallization risk of the aftertreatment system, and reducing the content of harmful substances in the emissions.

[0039] Among them, at least two heaters 30 are electric heaters. In other embodiments, the type of the heater is not limited to this.

[0040] Among them, the liquid inlet pipeline of the urea tank is selectively connected to the coolant pipeline of the engine through a coolant valve. The urea injection device exchanges heat energy with the engine's cooling system. By opening the coolant valve, the waste heat of the coolant after the engine warms up is used to heat the urea solution in the urea tank. This is an energy-saving and effective heating method, which helps to reduce the use of heaters and lower energy consumption.

[0041] Furthermore, at least two heaters 30 include a first heater 31 and a second heater 32. The first heater and the second heater 32 are respectively arranged at both ends of the urea heating pipe 20, and the first heater 31 and the second heater 32 are used to heat the urea solution in the urea heating pipe 20.

[0042] Specifically, under low-temperature conditions, urea is prone to crystallization, clogging the injection system. Through the heating of two heaters, the temperature of the solution in the urea heating pipe 20 can be maintained within an appropriate range, effectively preventing urea crystallization and ensuring the normal operation of the urea injection system. By arranging heaters at both ends of the urea heating pipe respectively, it can ensure that the heating of the urea solution in the pipeline is more uniform, avoiding the uneven temperature distribution of the urea solution in the heating pipe that may be caused by the traditional single-end heating method. At the same time, by setting the first heater 31 and the second heater 32, when the first heater 31 fails, the second heater 32 can still maintain the heating of the urea solution, ensuring the basic functions of the system.

[0043] In one of the embodiments, both the first heater 31 and the second heater 32 can be independently controlled. According to the instructions of the ECU (Electronic Control Unit), the heating power and time are adjusted to achieve precise management of the temperature of the urea solution. This control flexibility helps to optimize the heating strategy under different driving conditions, reduce energy consumption, and ensure the best atomization effect of urea injection at the same time.

[0044] Such as Figure 4As shown, the inner part of the urea heating pipe 20 is provided with a rib structure 21. The rib structure 21 is spirally arranged along the inner wall of the urea heating pipe 20 to form a spiral urea flow channel. The urea heating pipe 20 is provided with a through hole 22, and the through hole 22 is communicatively arranged with the spiral urea flow channel.

[0045] Specifically, the spirally arranged rib structure 21 increases the inner surface area of the urea heating pipe, making the heat exchange between the urea solution and the heater 30 more sufficient and improving the heating efficiency. This structure can ensure that when the urea solution flows through the heating pipe, it has a longer contact time with the heating surface, thereby accelerating the heating speed and shortening the time required for the urea solution to reach the working temperature. Among them, the first heater 31 and the second heater 32 are symmetrically arranged along the through hole 22, and the through hole 22 is used for the temperature sensor 80 to enter.

[0046] Furthermore, the electric heating urea injection system further includes: a second bracket 70. The second bracket 70 is arranged along the circumferential direction of the urea heating pipe 20, and the second bracket 70 is connected to the first bracket 10. The second bracket 70 has a receiving cavity 71, and the receiving cavity 71 is communicatively arranged with the through hole 22; a temperature sensor 80. Part of the temperature sensor 80 is located in the receiving cavity 71 and is arranged through the through hole 22. The temperature sensor 80 is used to collect the temperature information of the urea solution in the urea heating pipe 20.

[0047] Specifically, the temperature sensor 80 can directly contact the urea solution inside the urea heating pipe 20. By passing through the through hole 22 and partially extending into the spiral urea flow channel, it can achieve real-time and accurate measurement of the temperature of the urea solution. This is for controlling the temperature of urea heating, avoiding urea decomposition caused by overheating, and ensuring that urea works at the optimal injection temperature.

[0048] In this embodiment, the second bracket 70 is arranged along the circumferential direction of the urea heating pipe 20. At the same time, the second bracket 70 is welded to the urea heating pipe 20 to increase the structural strength of the second bracket 70 containing the temperature sensor 80 and ensure the accuracy and reliability of the temperature sensor 80 for temperature acquisition. In other embodiments, the connection method between the second bracket 70 and the urea heating pipe 20 is not limited to this, and it can also be bonding.

[0049] In one of the embodiments, the receiving cavity 71 is arranged as a threaded structure, and the bottom of the temperature sensor 80 is provided with a threaded structure. The temperature sensor 80 is threadedly connected to the second bracket 70.

[0050] In this embodiment, the second bracket 70 is a polygonal structure. A plurality of side edges of the second bracket 70 are provided with positioning holes. The first bracket 10 and the second bracket 70 are connected by bolts 11. In other embodiments, the connection method between the first bracket 10 and the second bracket 70 is not limited to this, and it can also be welding, bonding, clamping, etc.

[0051] Furthermore, the electric heating urea injection system further includes: a liquid inlet connector 50, one end of the liquid inlet connector 50 is connected to the liquid inlet of the urea heating pipe 20, and the other end of the liquid inlet connector 50 is communicated with the liquid outlet pipe of the urea tank; a liquid outlet connector 60, one end of the liquid outlet connector 60 is connected to the liquid outlet of the urea heating pipe 20, and the other end of the liquid outlet connector 60 is connected to the nozzle 40.

[0052] Specifically, the liquid inlet connector 50 connects the liquid outlet pipe of the urea tank and the urea heating pipe 20 to ensure that the urea solution can flow into the heating pipe stably and continuously. The liquid outlet connector 60 connects the liquid outlet of the heating pipe and the nozzle 40 to ensure that the heated urea solution can flow smoothly to the nozzle for injection. The design of these two connectors strengthens the sealing and reliability of the internal fluid transmission of the system, prevents urea leakage, and ensures the safe operation of the system.

[0053] As Figure 3 shown, on one side of the nozzle 40, there is a nozzle connector 41, the nozzle connector 41 is connected to the liquid outlet connector 60, and on the other side of the nozzle 40, there is a sealing ring 42.

[0054] Specifically, the urea heating pipe 20, the liquid outlet connector 60, and the second bracket 70 are welded around the contact surface of the urea heating pipe 20. Since the inside of the urea heating pipe 20 needs to be filled with high-temperature and high-pressure urea aqueous solution, requirements for welding quality are needed, that is, after welding, there should be no air leakage under 14 Mpa, and at the same time, no welding impurities are allowed. The liquid inlet connector 50 is threadedly fastened to the urea heating pipe 20, the temperature sensor 80 is threadedly fastened to the second bracket 70, the first heater 31 and the second heater 32 are symmetrically arranged on both sides of the second bracket 70 and are freely assembled onto the urea heating pipe 20, and the second bracket 70 is connected to the first bracket 10 by bolts 11. Among them, the temperature sensor 80 and the first bracket 10 adopt a multi-hole design, so that they can be arbitrarily arranged at the vehicle end. After the entire system is assembled, it is necessary to ensure no air leakage under 14 Mpa and no impurities inside. The urea solution enters the urea heating pipe 20 from the liquid inlet connector 50. The connection sides of the liquid inlet connector 50, the liquid outlet connector 60 and the urea heating pipe 20 all adopt ball valve seals, and a stepped hole is formed inside with the urea heating pipe 20 to achieve self-balancing of the internal pressure of the system under high-pressure environment and ensure the reliability of the system. The urea solution is stored in the urea heating pipe 20, the urea heating pipe 20 is heated by a dual-temperature heater, and the temperature inside the urea heating pipe 20 is measured by the temperature sensor 80 to ensure that the temperature in the heating chamber is 100 ± 10 °C. The inside of the urea heating pipe 20 adopts a spiral swirl structure, as shown in the appendix Figure 3As shown in the figure, increase the heating time of the urea solution. The urea solution flows through the urea nozzle via the liquid outlet connector. The structure of the urea nozzle connector uses a ball valve for sealing and simultaneously realizes a simple multi-stage pressure reduction structure. When the urea solution flows through the urea nozzle connector, the multi-stage pressure reduction can better achieve the refinement of the urea solution particles under pressure reduction. At the same time, it uses high-temperature resistant stainless steel material, adds a silicon carbide coating resistant to high-temperature corrosion inside, and adds a fluororubber gasket resistant to high temperature for sealing on the upper layer.

[0055] According to another aspect of the present invention, a control method for an electrically heated urea injection system is provided. The control method is used to control the electrically heated urea injection system of the above embodiment, as Figure 5 shown, the control method of the electrically heated urea injection system includes:

[0056] Step S11, obtain the driving condition information of the target vehicle. The driving condition information at least includes: cold start condition, low-speed condition, medium-speed condition, high-speed condition;

[0057] Step S12, collect the temperature information of the urea solution in the urea tank;

[0058] Step S13, generate a control strategy based on at least one of the driving condition information and the temperature information. The control strategy is used to control the opening or closing of the coolant valve, the first heater, and the second heater.

[0059] By implementing the above control method, the electrically heated urea injection system can intelligently adjust the heating strategy according to the real-time temperature information of the urea solution under different driving conditions. This adaptive control strategy not only significantly improves the heating efficiency and atomization effect of the urea injection system, making the conversion rate of nitrogen oxides remain at a high level under various conditions, but also can effectively reduce energy consumption and reduce the risk of urea crystallization in the system under cold start and low exhaust temperature conditions, thereby improving the reliability and service life of the aftertreatment system.

[0060] Further, step S13, generate a control strategy based on at least one of the driving condition information and the temperature information. The control strategy is used to control the opening or closing of the coolant valve, the first heater, and the second heater, including:

[0061] Step S131, in response to the target vehicle being in the cold start condition, generate the first control strategy in the control strategy. The first control strategy is used to control the opening of the coolant valve, the opening of the first heater, and the opening of the second heater.

[0062] The above-mentioned cold start condition refers to the engine state when the vehicle restarts after a long-time stop. At this time, the engine and the aftertreatment system are at a low temperature. Especially when the ambient temperature is extremely low, the urea solution may solidify or crystallize, affecting the injection effect and the normal operation of the system.

[0063] Through the above steps, under cold start conditions, since the system temperature is relatively low, the viscosity of the urea solution will increase, and crystallization may even occur, which will directly affect the normal operation of the urea injection system and further affect the efficiency of exhaust gas treatment. The implementation of the first control strategy can quickly increase the temperature of the urea solution inside the urea heating pipe 20 by simultaneously opening the coolant valve, the first heater, and the second heater. The opening of the coolant valve introduces the heat of the engine coolant, while the first heater and the second heater provide additional heating power. Under the combined action, the urea solution can quickly reach the appropriate working temperature, reduce the viscosity of the solution, avoid crystallization, and improve the atomization effect.

[0064] Further, in step S13, based on at least one of the driving condition information and the temperature information, a control strategy is generated, and the control strategy is used to control the opening or closing of the coolant valve, the first heater, and the second heater, including:

[0065] In step S132, in response to the target vehicle being in a low-speed condition and the temperature information being less than the preset temperature, the first control strategy in the control strategy is generated, and the first control strategy is used to control the opening of the coolant valve, the opening of the first heater, and the opening of the second heater;

[0066] In step S132, the above-mentioned low-speed condition refers to a state where both the engine speed and the exhaust temperature are relatively low when the vehicle is driving at a low speed. Under such conditions, the urea injection system is prone to problems such as a decrease in urea conversion efficiency due to insufficient exhaust temperature, poor atomization of the urea solution, and an increased risk of crystallization.

[0067] The above-mentioned preset temperature is the optimal working temperature set by the system under different working conditions. Below this temperature, the system believes that the urea solution needs additional heating to achieve a good atomization effect. Usually, the preset temperature will be within the appropriate range required for urea injection, such as 30 ± 10°C. In this embodiment, the preset temperature is 28°C.

[0068] In step S133, in response to the target vehicle being in a low-speed condition and the temperature information being greater than or equal to the preset temperature, the second control strategy in the control strategy is generated, and the second control strategy is used to control the closing of the coolant valve, the opening of the first heater, and the opening of the second heater.

[0069] Through the above steps, under low-speed working conditions, due to the relatively low exhaust gas temperature, the heating requirement of the urea injection system is more urgent to ensure the atomization quality and conversion efficiency of the urea solution. The combined use of the first control strategy and the second control strategy can intelligently adjust the heating mode according to the actual temperature of the urea solution, achieving efficient and energy-saving temperature control. The first control strategy reduces the crystallization risk of the urea solution through efficient heating, while improving the atomization effect of the solution, ensuring effective contact and conversion between urea and nitrogen oxides. After the temperature of the urea solution reaches the standard, the second control strategy switches to the electric heating mode only to maintain an appropriate injection temperature, further ensuring the conversion efficiency and reducing energy consumption, reflecting the flexibility and efficiency of the system design.

[0070] Further, in step S13, based on at least one of the driving condition information and the temperature information, a control strategy is generated, and the control strategy is used to control the opening or closing of the coolant valve, the first heater, and the second heater, including:

[0071] Step S134, in response to the target vehicle being in a medium-speed working condition and the temperature information being less than the preset temperature, a third control strategy in the control strategy is generated, and the third control strategy is used to control the coolant valve to open, the first heater to open, and the second heater to close;

[0072] In step S134, the above-mentioned medium-speed working condition means that when the vehicle is driving at a medium speed, the engine speed and the exhaust gas temperature are in a state that is neither extremely low nor extremely high. In this working condition, it is necessary to balance the heating requirement and the energy consumption.

[0073] Step S135, in response to the target vehicle being in a medium-speed working condition and the temperature information being greater than or equal to the preset temperature, a fourth control strategy in the control strategy is generated, and the fourth control strategy is used to control the coolant valve to close, the first heater to open, and the second heater to close.

[0074] Through the above steps, under medium-speed working conditions, the operating state of the vehicle is between low speed and high speed, the exhaust gas temperature and the waste heat generated by the engine are relatively stable, but the heating requirement of the urea solution still exists to ensure its injection at an appropriate temperature and achieve the best conversion efficiency. Under medium-speed working conditions, the system preferentially uses the waste heat of the engine coolant to increase the temperature of the urea solution through the third control strategy. This strategy of using waste heat reduces the usage time of the electric heater, thereby saving electric energy consumption. When the temperature of the urea solution reaches the standard, the fourth control strategy reduces the system's dependence on the coolant by closing the coolant valve, avoiding unnecessary circulation and energy loss of the coolant, and reducing the burden on the cooling system.

[0075] Further, in step S13, based on at least one of the driving condition information and the temperature information, a control strategy is generated, and the control strategy is used to control the opening or closing of the coolant valve, the first heater, and the second heater, including:

[0076] Step S136: In response to the target vehicle being in a high-speed operating condition, generate a fifth control strategy in the control strategy. The fifth control strategy is used to control the coolant valve to open, the first heater to turn off, and the second heater to turn off.

[0077] In step S136, the above-mentioned high-speed operating condition means that when the vehicle is in a high-speed driving state, the engine speed and exhaust temperature are relatively high. In this operating condition, the after-treatment system can usually obtain sufficient heating to reach the optimal working state.

[0078] Step S137: In response to the target vehicle being in a high-speed operating condition and the ambient temperature being greater than or equal to a preset temperature, generate a sixth control strategy in the control strategy. The sixth control strategy is used to control the coolant valve to close, the first heater to turn off, and the second heater to turn off, where the ambient temperature is used to represent the atmospheric temperature.

[0079] Through the above steps, in a high-speed operating condition, due to the high exhaust temperature, the coolant valve can be opened through the fifth control strategy, and natural heat exchange can be carried out using the coolant, avoiding or reducing energy waste caused by electric heating and effectively saving power consumption. When the vehicle is in a high-speed operating condition and the ambient temperature is relatively high, all heating devices can be turned off through the sixth control strategy, which can prevent the decomposition or carbonization of the urea solution caused by too high temperature, protect the system from damage, and maintain the safe and stable operation of the system.

[0080] For the sake of convenience in description, spatial relative terms such as "above", "on top of", "on the upper surface", "upper" etc. can be used here to describe the spatial position relationship between a device or feature shown in the figure and other devices or features. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation described in the figure for the device. For example, if the device in the drawing is inverted, the device described as "above" or "on top of" other devices or structures will then be positioned as "below" or "beneath" other devices or structures. Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations should be made for the spatial relative descriptions used here.

[0081] In addition to the above, it should be noted that the "one embodiment", "another embodiment", "embodiment" and the like mentioned in this specification refer to the specific features, structures or characteristics described in connection with that embodiment being included in at least one embodiment generally described in this application. The same expression appearing in multiple places in the specification does not necessarily refer to the same embodiment. Further, when describing a specific feature, structure or characteristic in connection with any one embodiment, it is intended that the implementation of such feature, structure or characteristic in connection with other embodiments also fall within the scope of the present invention.

[0082] In the above embodiments, the descriptions of each embodiment have their own emphases. For parts not detailed in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

[0083] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An electric heating urea injection system, characterized in that, Comprising: A first bracket (10); A urea heating pipe (20), the urea heating pipe (20) being located on the first bracket (10), an inlet of the urea heating pipe (20) being used for communicating with an outlet pipe of a urea tank, and a nozzle (40) being provided at an outlet of the urea heating pipe (20); At least two heaters (30), at least two of the heaters (30) being arranged along a circumferential direction of the urea heating pipe (20), and at least two of the heaters (30) being provided at two ends of the urea heating pipe (20).

2. The electric heating urea injection system according to claim 1, wherein At least two of the heaters (30) include a first heater (31) and a second heater (32), the first heater (31) and the second heater (32) being respectively provided at two ends of the urea heating pipe (20), and the first heater (31) and the second heater (32) being used for heating a urea solution in the urea heating pipe (20).

3. The electric heating urea injection system according to claim 1, characterized in that, A rib structure (21) is provided inside the urea heating pipe (20), the rib structure (21) being spirally arranged along an inner wall of the urea heating pipe (20) to form a spiral urea flow channel, and a through hole (22) is provided on the urea heating pipe (20), the through hole (22) being communicatively arranged with the spiral urea flow channel.

4. The electric heating urea injection system according to claim 3, characterized in that The electric heating urea injection system further comprises: A second bracket (70), the second bracket (70) being arranged along the circumferential direction of the urea heating pipe (20), and the second bracket (70) being connected to the first bracket (10), the second bracket (70) having a receiving cavity (71), the receiving cavity (71) being communicatively arranged with the through hole (22); A temperature sensor (80), a part of the temperature sensor (80) being located inside the receiving cavity (71) and passing through the through hole (22), the temperature sensor (80) being used for collecting temperature information of the urea solution in the urea heating pipe (20).

5. The electric heating urea injection system according to claim 1, characterized in that The electric heating urea injection system further comprises: An inlet connector (50), one end of the inlet connector (50) being connected to the inlet of the urea heating pipe (20), and the other end of the inlet connector (50) being communicatively connected to the outlet pipe of the urea tank; An outlet connector (60), one end of the outlet connector (60) being connected to the outlet of the urea heating pipe (20), and the other end of the outlet connector (60) being connected to the nozzle (40).

6. A control method for an electric heating urea injection system, the control method being used to control the electric heating urea injection system according to any one of claims 1-5, characterized in that, The control method comprises: Obtaining driving condition information of a target vehicle, the driving condition information at least including: a cold start condition, a low speed condition, a medium speed condition, and a high speed condition; Collecting temperature information of the urea solution in the urea tank; Generating a control strategy based on at least one of the driving condition information and the temperature information, the control strategy being used for controlling opening or closing of a coolant valve, a first heater, and a second heater.

7. The control method of the electric heating urea injection system according to claim 6, characterized in that Generating the control strategy based on at least one of the driving condition information and the temperature information, the control strategy being used for controlling opening or closing of a coolant valve, a first heater, and a second heater, including: In response to the target vehicle being in the cold start condition, generate a first control strategy in the control strategy, where the first control strategy is used to control the coolant valve to open, the first heater to turn on, and the second heater to turn on.

8. The control method of the electric heating urea injection system according to claim 6, characterized in that, Generate the control strategy based on at least one of the driving condition information and the temperature information, where the control strategy is used to control the coolant valve, the first heater, and the second heater to open or close, including: In response to the target vehicle being in the low-speed condition and the temperature information being less than a preset temperature, generate a first control strategy in the control strategy, where the first control strategy is used to control the coolant valve to open, the first heater to turn on, and the second heater to turn on; In response to the target vehicle being in the low-speed condition and the temperature information being greater than or equal to the preset temperature, generate a second control strategy in the control strategy, where the second control strategy is used to control the coolant valve to close, the first heater to turn on, and the second heater to turn on.

9. The control method of the electric heating urea injection system according to claim 6, characterized in that, Generate the control strategy based on at least one of the driving condition information and the temperature information, where the control strategy is used to control the coolant valve, the first heater, and the second heater to open or close, including: In response to the target vehicle being in the medium-speed condition and the temperature information being less than a preset temperature, generate a third control strategy in the control strategy, where the third control strategy is used to control the coolant valve to open, the first heater to turn on, and the second heater to turn off; In response to the target vehicle being in the medium-speed condition and the temperature information being greater than or equal to the preset temperature, generate a fourth control strategy in the control strategy, where the fourth control strategy is used to control the coolant valve to close, the first heater to turn on, and the second heater to turn off.

10. The control method of the electric heating urea injection system according to claim 6, wherein, Generate the control strategy based on at least one of the driving condition information and the temperature information, where the control strategy is used to control the coolant valve, the first heater, and the second heater to open or close, including: In response to the target vehicle being in the high-speed condition, generate a fifth control strategy in the control strategy, where the fifth control strategy is used to control the coolant valve to open, the first heater to turn off, and the second heater to turn off; In response to the target vehicle being in the high-speed condition and the ambient temperature being greater than or equal to a preset temperature, generate a sixth control strategy in the control strategy, where the sixth control strategy is used to control the coolant valve to close, the first heater to turn off, and the second heater to turn off, where the ambient temperature is used to characterize the atmospheric temperature.

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