A urea fuel heating valve control pipeline, a urea fuel heating system and a vehicle

Abstract

Embodiments of the present application provide a urea fuel heating valve control pipeline, a urea fuel heating system and a vehicle. The urea fuel heating valve control pipeline comprises an engine cooling pipeline, a urea nozzle cooling pipeline, a heating pipeline and a two-position three-way valve; the heating pipeline comprises a urea heating pipeline and a fuel heating pipeline; the water outlet end of the engine cooling pipeline is connected with the water inlet end of the urea nozzle cooling pipeline; the water inlet end of the two-position three-way valve is connected with the water outlet end of the urea nozzle cooling pipeline; the first water outlet end of the two-position three-way valve is connected with the water inlet end of the heating pipeline, and the second water outlet end of the two-position three-way valve and the water outlet end of the heating pipeline are connected with the water return end of the engine cooling pipeline; when the urea fuel is heated, the first water outlet end of the two-position three-way valve is opened, and the second water outlet end is closed, so that the engine coolant flowing through the urea nozzle cooling pipeline enters the urea heating pipeline and the fuel heating pipeline, and the heating of the urea and the fuel is realized. The present application improves the heating efficiency and the control efficiency.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and in particular to a urea fuel heating valve control pipeline, a urea fuel heating system, and a vehicle. Background Technology

[0002] With increasing global awareness of environmental protection and increasingly stringent emission regulations, exhaust emission control technology for heavy-duty diesel vehicles has become an important research direction in the automotive industry. To meet the China VI emission standards' requirements for nitrogen oxide emissions, heavy-duty diesel vehicles generally employ selective catalytic reduction (SCR) technology, using urea solution as the primary reactant. This technology converts NOx into harmless nitrogen and water by injecting urea solution into the exhaust system, under the action of a catalyst. However, in low-temperature environments, the urea solution stored in the urea tank is prone to freezing, affecting the normal operation of the SCR system.

[0003] In existing technologies, urea heating is typically achieved by drawing water from the engine through a urea heating line. However, current urea heating lines are usually connected to the engine's water inlet / outlet in parallel with the urea injector cooling and fuel heating systems, utilizing the pressure generated by the engine's water pump for circulation. This parallel connection structure suffers from uneven flow distribution and low control efficiency in practical applications. Utility Model Content

[0004] This application provides a urea fuel heating valve control pipeline, a urea fuel heating system, and a vehicle to solve the problems of uneven flow distribution and low control efficiency in existing structures during practical applications.

[0005] In a first aspect, embodiments of this application provide a urea fuel heating valve control pipeline, including an engine cooling pipeline, a urea injector cooling pipeline, a heating pipeline, and a two-position three-way valve; the heating pipeline includes a urea heating pipeline and a fuel heating pipeline;

[0006] The outlet of the engine cooling pipe is connected to the inlet of the urea nozzle cooling pipe;

[0007] The inlet of the two-position three-way valve is connected to the outlet of the urea nozzle cooling pipe; the first outlet of the two-position three-way valve is connected to the inlet of the heating pipe; and the second outlet of the two-position three-way valve is connected to the return end of the engine cooling pipe.

[0008] The outlet of the heating pipe is connected to the return end of the engine cooling pipe;

[0009] When heating urea and fuel, the first outlet of the two-position three-way valve opens and the second outlet of the two-position three-way valve closes, allowing the engine coolant flowing through the urea nozzle cooling pipe to enter the urea heating pipe and fuel heating pipe in the heating pipe, thereby heating urea and fuel.

[0010] In one possible implementation, the urea heating line and the fuel heating line are connected in parallel or in series.

[0011] In one possible implementation, the urea heating pipeline and the fuel heating pipeline are connected in parallel; the urea and fuel heating valve control pipeline also includes: a water inlet tee connector;

[0012] The inlet end of the inlet tee is connected to the first outlet end of the two-position three-way valve;

[0013] The first outlet end of the inlet tee is connected to the inlet end of the urea heating pipe;

[0014] The second outlet of the water inlet tee is connected to the water inlet of the fuel heating pipe.

[0015] In one possible implementation, the urea fuel heating valve control line further includes: a return water four-way connector;

[0016] The first inlet end of the return water four-way connector is connected to the second outlet end of the two-position three-way valve;

[0017] The second inlet of the return water four-way connector is connected to the outlet of the urea heating pipe;

[0018] The third inlet of the return water four-way connector is connected to the outlet of the fuel heating pipe;

[0019] The outlet end of the return water four-way connector is connected to the return water end of the engine cooling pipe.

[0020] In one possible implementation, the two-position three-way valve is an electrically controlled two-position three-way valve, and the urea fuel heating valve control pipeline further includes: an electronic control unit; the control signal output terminal of the electronic control unit is electrically connected to the signal input terminal of the electrically controlled two-position three-way valve;

[0021] The electronic control unit is used to send control signals to the electrically controlled two-position three-way valve. The control signals are used to control the opening and closing of the first and second outlet ends of the electrically controlled two-position three-way valve.

[0022] In one possible implementation, the urea fuel heating valve control line further includes: a plurality of temperature sensors electrically connected to the electronic control unit;

[0023] Multiple temperature sensors are used to detect the relevant temperatures in the urea fuel heating valve control line and output temperature signals;

[0024] The electronic control unit is used to receive temperature signals and send control signals to the electrically controlled two-position three-way valve.

[0025] In one possible implementation, the multiple temperature sensors include a water temperature sensor, a urea temperature sensor, and an ambient temperature sensor.

[0026] Secondly, embodiments of this application provide a urea fuel heating system, including the urea fuel heating valve control pipeline as described in the first aspect and / or various possible implementations of the first aspect.

[0027] In one possible implementation, when the system includes the urea fuel heating valve control line as described in the first aspect and / or the first three possible implementations of the first aspect, the system also includes an electronic control unit and multiple temperature sensors.

[0028] The two-position three-way valve in the urea fuel heating valve control line is an electrically controlled two-position three-way valve;

[0029] The electrically controlled two-position three-way valve and multiple temperature sensors are electrically connected to the electronic control unit.

[0030] Multiple temperature sensors are used to detect the relevant temperatures in the urea fuel heating valve control line and output temperature signals;

[0031] The electronic control unit is used to receive temperature signals and send control signals to the electrically controlled two-position three-way valve in the urea fuel heating valve control line. The control signals are used to control the opening and closing of the first and second water outlets in the electrically controlled two-position three-way valve.

[0032] Thirdly, embodiments of this application provide a vehicle, including: an engine, a urea tank, a fuel tank, and a urea fuel heating system as described in the second aspect and / or various possible embodiments of the second aspect;

[0033] The urea fuel heating system is integrated with the engine's cooling system to heat the urea in the urea tank and the fuel in the fuel tank.

[0034] This application provides a urea fuel heating valve control pipeline, a urea fuel heating system, and a vehicle. By connecting the urea nozzle cooling pipeline to the outlet of the engine cooling pipeline, and then connecting the urea nozzle cooling pipeline to the heating pipeline via a two-position three-way valve, the flow direction of the coolant is controlled by the two-position three-way valve, improving control efficiency. When heating is required, the engine coolant is uniformly guided to the urea nozzle cooling pipeline and then introduced into the heating pipeline by the two-position three-way valve, solving the problem of uneven flow distribution caused by different pipeline resistances in the existing structure, thus improving heating efficiency. When heating is not required, the engine coolant is uniformly guided to the urea nozzle cooling pipeline and then introduced into the engine cooling pipeline by the two-position three-way valve, avoiding unnecessary energy loss and thus reducing the overall energy consumption of the pipeline and system. Attached Figure Description

[0035] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0036] Figure 1 This is a schematic diagram of the structure of an existing urea fuel heating pipeline provided in an embodiment of this application;

[0037] Figure 2 A schematic diagram of the urea fuel heating valve control pipeline provided in the embodiments of this application. Figure 1 ;

[0038] Figure 3 A schematic diagram of the urea fuel heating valve control pipeline provided in the embodiments of this application. Figure 2 ;

[0039] Figure 4 A schematic diagram of the urea fuel heating valve control pipeline provided in the embodiments of this application. Figure 3 ;

[0040] Figure 5 A schematic diagram of the urea fuel heating valve control pipeline provided in the embodiments of this application. Figure 4 ;

[0041] Figure 6 A schematic diagram of the urea fuel heating valve control pipeline provided in the embodiments of this application. Figure 5 ;

[0042] Figure 7 This is a schematic diagram of the structure of a urea fuel heating system provided in an embodiment of this application;

[0043] Figure 8 This is a schematic diagram of the execution flow of a urea fuel heating system provided in an embodiment of this application.

[0044] Explanation of reference numerals in the attached figures:

[0045] 1-Engine water outlet; 2-Engine water outlet pipe; 3-Engine water return pipe; 4-Engine water return outlet; 5-Urea nozzle; 6-Urea nozzle water return pipe; 7-Urea level, temperature and mass sensor; 8-Urea heating water outlet pipe; 9-Urea heating water inlet pipe; 10-Two-position three-way valve; 11-Two-position three-way valve water outlet pipe one; 12-Two-position three-way valve water outlet pipe two; 13-Return water four-way connector; 14-Water inlet three-way connector; 15-Fuel heating water inlet pipe; 16-Fuel level sensor; 17-Fuel heating water outlet pipe.

[0046] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0047] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0048] The terms "first," "second," "third," "fourth," etc. (if present) in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the present utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0049] First, let me explain the terms used in this application:

[0050] SCR system: Short for Selective Catalytic Reduction System. Through the action of a catalyst, an injectable reducing agent, ammonia or urea, is used to reduce NOx in diesel vehicle exhaust into nitrogen and water, thereby reducing NOx emission concentration.

[0051] Solenoid valve: A special electrical device installed in a pipeline to control the on / off state or flow direction of liquids or gases, such as a one-way solenoid valve or an electrically controlled two-position three-way valve.

[0052] ECU stands for Electronic Control Unit. An ECU is an embedded system used to control a vehicle's electrical systems or subsystems. Modern cars may contain multiple ECUs to manage different functions. Each ECU typically consists of a microprocessor, software, and hardware interfaces to perform specific control tasks.

[0053] Thermostat: This is an adjusting component in the engine's cooling system that automatically adjusts the coolant circulation path based on the engine coolant temperature. When the engine coolant temperature is low, the thermostat closes the large circulation channel, allowing the coolant to flow in the small circulation channel, thus accelerating the engine's warm-up rate.

[0054] Figure 1 This is a schematic diagram of the structure of an existing urea fuel heating pipeline provided in an embodiment of this application, as shown below. Figure 1 As shown, in existing technologies, the urea heating pipeline is typically connected in parallel with the urea nozzle cooling and fuel heating systems to the engine's water return four-way interface, utilizing the pressure generated by the engine's water pump for circulation. The urea heating is controlled to open and close via a solenoid valve, while the fuel tank heating in the fuel heating system is controlled to open and close via a manual valve. Specifically, urea heating prevents the urea solution from freezing at low temperatures, ensuring its proper injection in the SCR system; urea nozzle cooling prevents nozzle damage due to high temperatures, ensuring accurate urea solution metering; and the fuel heating system prevents wax buildup on low-octane diesel fuel used in cold regions, thus preventing it from affecting normal engine operation.

[0055] However, the existing structure has the following drawbacks:

[0056] (1) Uneven flow distribution: Urea nozzle cooling, urea heating and oil tank heating are connected in parallel, and the mechanical energy loss of each branch pipe is equal. Since the resistance of the urea heating pipeline is usually greater than that of the urea nozzle cooling pipeline, the flow of the urea heating pipeline is smaller. In order to meet the specified thawing requirements, the pipe diameter needs to be increased to reduce the resistance, which undoubtedly increases the cost.

[0057] (2) Low control efficiency: Urea heating and fuel tank heating are controlled by two separate water valves, resulting in a waste of resources; moreover, fuel tank heating generally uses a manual water shut-off valve, which requires the driver to manually switch it on and off, increasing the driver's operating burden; at the same time, continuous heating during driving will also increase unnecessary energy consumption.

[0058] (3) Low safety: The urea heating water valve uses a one-way solenoid valve. If the water inlet and outlet ports on the urea tank are reversed, the urea will be continuously heated, posing a risk of urea overheating. It is necessary to confirm the compatibility of the ports at both ends of the pipeline during assembly.

[0059] To address the aforementioned technical problems, this application provides a urea fuel heating valve control pipeline, a urea fuel heating system, and a vehicle. This urea fuel heating valve control pipeline connects the urea nozzle cooling pipeline to the outlet of the engine cooling pipeline, and then connects the urea nozzle cooling pipeline to the heating pipeline via a two-position three-way valve. The two-position three-way valve controls the coolant flow direction, replacing the existing dual-valve design. This simplifies the management structure, reduces costs, and improves control efficiency. When heating is required, the engine coolant is guided to the urea nozzle cooling pipeline and then introduced into the heating pipeline via the two-position three-way valve, forming a series structure between the urea nozzle cooling pipeline and the heating pipeline. This solves the problem of uneven flow distribution caused by different pipeline resistances in the existing structure, ensuring sufficient flow to the urea heating pipeline and improving heating efficiency. When heating is not required, the engine coolant is guided to the urea nozzle cooling pipeline and then introduced into the engine cooling pipeline via the two-position three-way valve, avoiding unnecessary energy loss and reducing the overall energy consumption of the pipeline and system. In addition, the two-position three-way valve has a different function from the one-way valve. It can work normally as long as the inlet and outlet are connected correctly, which can avoid the risk of urea overheating due to incorrect assembly.

[0060] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0061] Reference Figures 2 to 4 This application provides a urea fuel heating valve control pipeline, including an engine cooling pipeline, a urea injector cooling pipeline, a heating pipeline, and a two-position three-way valve; the heating pipeline includes a urea heating pipeline and a fuel heating pipeline;

[0062] The outlet of the engine cooling pipe is connected to the inlet of the urea nozzle cooling pipe;

[0063] The inlet of the two-position three-way valve is connected to the outlet of the urea nozzle cooling pipe; the first outlet of the two-position three-way valve is connected to the inlet of the heating pipe; and the second outlet of the two-position three-way valve is connected to the return end of the engine cooling pipe.

[0064] The outlet of the heating pipe is connected to the return end of the engine cooling pipe;

[0065] When heating urea and fuel, the first outlet of the two-position three-way valve opens and the second outlet of the two-position three-way valve closes, allowing the engine coolant flowing through the urea nozzle cooling pipe to enter the urea heating pipe and fuel heating pipe in the heating pipe, thereby heating urea and fuel.

[0066] In this embodiment, the engine cooling pipe can refer to the main channel for circulating engine coolant. The heat generated during engine operation is carried away by the circulation of coolant in this pipe to maintain the normal operating temperature range of the engine and prevent the engine from being damaged due to overheating.

[0067] Urea nozzle cooling lines refer to the lines used to cool urea nozzles. During operation, urea nozzles may accumulate heat due to high engine exhaust temperatures and ambient conditions. This line introduces engine coolant to dissipate this heat, ensuring the urea nozzles function properly and preventing performance degradation or damage due to overheating.

[0068] The heating system comprises two parts: a urea heating system and a fuel heating system. Since the freezing point of urea solution is around -11°C, and in winter, especially in northern regions where temperatures can reach -35°C, the urea solution will be completely frozen. Therefore, the function of the urea heating system is to heat the urea solution in the urea tank at low temperatures, preventing it from freezing and ensuring that the urea can be smoothly injected and react with nitrogen oxides in the exhaust gas, achieving the purpose of exhaust gas treatment. The fuel heating system is used to heat the fuel in the vehicle's fuel tank, improving fuel flow, especially in low-temperature environments, allowing for better fuel atomization and combustion, thus improving engine combustion efficiency and performance.

[0069] A two-position three-way valve can refer to a valve with two outlets and one inlet. In this embodiment, its inlet is connected to the outlet of the urea nozzle cooling pipe, and the two outlets are respectively connected to the inlet of the heating pipe and the return pipe of the engine cooling pipe. By controlling the opening and closing states of the two outlets in the two-position three-way valve, precise control of the coolant flow direction can be achieved, determining whether the coolant enters the heating pipe to heat the urea and fuel, or flows directly back to the engine cooling pipe.

[0070] The two-position three-way valve can be a common two-position three-way valve that opens and closes the first and second outlets mechanically or manually. For example, a spring-reset type: when there is no external force, the spring pushes the valve core to close the first outlet, and the coolant flows out only from the second outlet; when an external force is applied, the valve core compresses the spring, the first outlet opens, and the second outlet closes, thus achieving the heating function. The two-position three-way valve can also be an electrically controlled two-position three-way valve that uses electronic signals to control the position of its internal valve core, thereby opening and closing the first and second outlets. In this case, the electronic signal is generated based on a preset program and algorithm, which can be set based on experience and existing known programs. For example, a temperature threshold for triggering the generation of the electronic signal can be set based on experience. When the current temperature meets the threshold condition, an electronic signal is generated based on a known program to control the opening and closing of each outlet in the electrically controlled two-position three-way valve.

[0071] In one example, under low-temperature conditions or when heating conditions are met (such as heating conditions preset based on experience and existing procedures), the first outlet of the two-position three-way valve opens and the second outlet closes. At this time, the engine coolant flowing through the urea nozzle cooling line enters the urea heating line and fuel heating line in the heating line to heat the urea and fuel. When the temperature rises to the preset condition (such as the heating stop condition preset based on experience and existing procedures), the second outlet of the two-position three-way valve opens and the first outlet closes. At this time, the engine coolant flowing through the urea nozzle cooling line flows back to the engine cooling line through the second outlet.

[0072] The urea fuel heating valve control pipeline provided in this application guides the engine coolant to the urea nozzle cooling pipeline when heating is required. Then, a two-position three-way valve introduces the coolant into the heating pipeline, creating a series connection between the urea nozzle cooling pipeline and the heating pipeline. This solves the problem of uneven flow distribution caused by different pipeline resistances in existing structures, ensuring sufficient flow to the urea heating pipeline and improving heating efficiency. Furthermore, replacing the existing dual-valve design with a two-position three-way valve simplifies the management structure, reduces costs, and improves control efficiency. In addition, unlike a one-way valve, the two-position three-way valve only requires correct inlet and outlet connections to operate normally, avoiding the risk of urea overheating due to assembly errors.

[0073] In some embodiments, see continue to see Figure 3 and Figure 4 The urea heating pipeline and the fuel heating pipeline are connected in parallel or in series.

[0074] in, Figure 3A possible implementation method is provided for connecting urea heating lines and fuel heating lines in parallel. Further, in this parallel connection, the urea heating line and the fuel heating line each have independent channels connected to the first outlet of a two-position three-way valve and the return end of the engine cooling line. After the engine coolant flows out from the first outlet of the two-position three-way valve, it simultaneously enters both the urea heating line and the fuel heating line to heat the urea and fuel. The heated coolant then flows back to the return end of the engine cooling line. This connection method makes the heating of urea and fuel structurally relatively independent. However, because they share the same inlet and outlet, the flow distribution between the two lines depends on the flow resistance of each line, and the actual flow rate will affect each other, potentially lower than the single-line flow rate under series operation. Therefore, in the parallel connection, the heating parameters can be adjusted according to their respective needs, taking into account the overall flow distribution and resistance matching.

[0075] Figure 4 One possible implementation is provided: a urea heating line and a fuel heating line connected in series. Further, in this series connection, after the engine coolant flows out from the first outlet of the two-position three-way valve, it first enters one of the lines (e.g., the urea heating line) to heat the urea. Then, the engine coolant flowing out from that line enters the fuel heating line to heat the fuel. Finally, the heated engine coolant flows back from the fuel heating line to the return end of the engine coolant line. In this method, the heating processes of urea and fuel are performed sequentially, with the engine coolant providing heat to both in turn.

[0076] Parallel connection allows for precise control of the different heating needs of both components, improving heating efficiency and stability; series connection utilizes the waste heat of the coolant, achieving tiered energy utilization, which is more advantageous in scenarios with compact spatial layouts. It can also effectively solve the problems of urea solution freezing and poor fuel flow in low-temperature environments, improving the adaptability and reliability of the entire vehicle system in low-temperature environments.

[0077] In some embodiments, see Figure 5 The urea heating pipeline and the fuel heating pipeline are connected in parallel; the urea and fuel heating valve control pipeline may also include: a water inlet tee connector; the water inlet end of the water inlet tee connector is connected to the first water outlet end of the two-position three-way valve; the first water outlet end of the water inlet tee connector is connected to the water inlet end of the urea heating pipeline; and the second water outlet end of the water inlet tee connector is connected to the water inlet end of the fuel heating pipeline.

[0078] The inlet tee fitting refers to a pipe fitting with three connection ports. Its inlet end connects to the first outlet end of a two-position three-way valve, serving to receive the coolant flowing from the valve, ready for heating. The first outlet end connects to the inlet end of the urea heating line, guiding some coolant to the urea heating line to heat the urea. The second outlet end connects to the inlet end of the fuel heating line, introducing the remaining coolant into the fuel heating line to heat the fuel. Through this structural design, the inlet tee fitting achieves a reasonable distribution of coolant between the urea heating line and the fuel heating line.

[0079] Optionally, the inlet tee can also be integrated with a two-position three-way valve to reduce the occupancy of installation space and avoid fluid inertia delay caused by pipeline connection, thereby improving the control accuracy and space utilization of the pipeline.

[0080] By using an inlet tee connector to precisely distribute coolant to the urea heating line and the fuel heating line, both lines receive adequate heat simultaneously, effectively solving the problems of urea solution freezing and poor fuel flow in low-temperature environments. This structure not only improves heating efficiency and stability but also makes the pipeline layout more reasonable, facilitating installation and maintenance, and enhancing the reliability and practicality of the entire urea and fuel heating valve control pipeline and system.

[0081] Based on the above embodiments, see below. Figure 5 The urea fuel heating valve control line may also include: a return water four-way connector; the first inlet of the return water four-way connector is connected to the second outlet of the two-position three-way valve; the second inlet of the return water four-way connector is connected to the outlet of the urea heating line; the third inlet of the return water four-way connector is connected to the outlet of the fuel heating line; and the outlet of the return water four-way connector is connected to the return water end of the engine cooling line.

[0082] The return water four-way connector refers to a pipe fitting with four connection ports. The first inlet port connects to the second outlet port of a two-position three-way valve. When heating of urea and fuel is not required, the coolant flowing from the urea nozzle cooling pipe and exiting through the second outlet port of the two-position three-way valve enters this port. The second inlet port connects to the outlet port of the urea heating pipe to receive the coolant after urea heating. The third inlet port connects to the outlet port of the fuel heating pipe to receive the coolant after fuel heating. The outlet port connects to the return water port of the engine cooling pipe, collecting the coolant from the three pipes and returning it to the engine cooling pipe, completing the coolant circulation.

[0083] Optionally, the return water four-way connector can also be integrated with the return water end of the engine cooling pipe or other coolant ports of the corresponding system and engine cooling system in the vehicle. For example, the return water four-way connector can be integrated into the engine inlet pipe or the heater return water pipe. The engine inlet pipe is the pipe that supplies coolant from the radiator (or cryogenic cooler) to the engine water jacket, and is usually located on the front module of the engine or the water pump inlet side. The heater return water pipe is the pipe that returns the coolant that has absorbed heat from the passenger compartment in the heater core to the engine cooling system. By integrating with other components, the occupancy rate of the installation space can be reduced, and the control accuracy and space utilization of the pipes can be improved.

[0084] By introducing a four-way return connector, the circulation system of the urea-fuel heating valve control pipeline has been further improved. It efficiently collects the heated coolant (from the urea heating pipeline and the fuel heating pipeline) and the coolant that flows back directly under non-heating conditions, and accurately delivers it back to the engine cooling pipeline. This ensures smooth and stable coolant circulation, enabling orderly coolant flow throughout the entire urea-fuel heating valve control pipeline under different operating conditions, thus improving the reliability and energy efficiency of the urea-fuel heating valve control pipeline.

[0085] In some embodiments, the two-position three-way valve is an electrically controlled two-position three-way valve, and the urea fuel heating valve control pipeline further includes: an electronic control unit; the control signal output terminal of the electronic control unit is electrically connected to the signal input terminal of the electrically controlled two-position three-way valve; the electronic control unit is used to send a control signal to the electrically controlled two-position three-way valve, and the control signal is used to control the opening and closing of the first water outlet and the second water outlet in the electrically controlled two-position three-way valve.

[0086] Understandably, the electronic control unit (ECU) is responsible for monitoring preset data (such as engine temperature and urea temperature) according to pre-set programs and algorithms, analyzing and processing this data, and then sending corresponding control signals to the electronically controlled 2-position 3-way valve to achieve automated control of the coolant flow direction. Compared to ordinary 2-position 3-way valves, the electronically controlled 2-position 3-way valve features fast response and high control precision. It can quickly and accurately change the coolant flow direction according to the instructions issued by the ECU, reducing driver intervention and meeting the needs of urea and fuel heating under different operating conditions.

[0087] Based on the above embodiments, the urea fuel heating valve control pipeline further includes: multiple temperature sensors electrically connected to the electronic control unit; multiple temperature sensors for detecting the relevant temperature of the urea fuel heating valve control pipeline and outputting temperature signals; and the electronic control unit for receiving temperature signals and sending control signals to the electronically controlled two-position three-way valve.

[0088] In this embodiment, multiple temperature sensors detect the temperature of relevant parts in the urea fuel heating valve control line, enabling the electronic control unit to monitor and acquire preset data for generating control signals. For example, sensors may be included to detect urea temperature, preventing the urea solution from freezing in low-temperature environments (such as -11°C to -18°C) and affecting exhaust gas treatment; sensors may be included to detect engine coolant temperature, helping to determine the engine's operating status and whether heating needs to be started or stopped; and sensors may be included to detect fuel temperature, ensuring good fuel flow at appropriate temperatures and improving combustion efficiency. Each sensor converts the temperature information at the detected location into an electrical signal.

[0089] In some examples, 1) multiple temperature sensors continuously monitor the temperature of relevant parts in the urea-fuel heating valve control line and convert the detected temperature information into electrical signals. Each temperature sensor transmits its generated electrical signals to the electronic control unit (ECU) via wires. The ECU has multiple input interfaces and can simultaneously receive signals from different temperature sensors. 2) After receiving the temperature signals, the ECU analyzes and processes them, comparing the actual detected temperature with a set threshold according to a preset program and algorithm. For example, when the ambient temperature is low, if the urea temperature is below the temperature threshold, or if the engine coolant temperature reaches a certain level and fuel preheating is required, the ECU determines that the heating function needs to be activated. 3) If heating is required, the ECU sends a control signal to the electronically controlled two-position three-way valve through its control signal output terminal, instructing the first outlet of the electronically controlled two-position three-way valve to open and the second outlet to close. At this time, coolant flows out from the urea nozzle cooling line, and after being split by the first outlet and the inlet three-way connector of the two-position three-way valve, it enters the urea heating line and the fuel heating line respectively to heat the urea and fuel. 4) In addition, during the heating process, multiple temperature sensors continue to monitor the relevant temperatures in real time and feed the new temperature signals back to the electronic control unit (ECU). The ECU continuously determines whether the heating stop conditions have been met based on these feedback signals, such as the urea temperature being higher than the target temperature and the engine coolant temperature meeting the requirements. When the stop conditions are met, the ECU sends a control signal to the electronically controlled two-position three-way valve again, causing its first outlet to close and its second outlet to open, thus stopping the heating process.

[0090] It should be noted that the preset programs and algorithms used for detecting temperature and generating control signals in the multiple temperature sensors and electronic control units of this application can be set and determined using existing technologies and known programs.

[0091] By employing an electronically controlled two-position three-way valve, an electronic control unit, and multiple temperature sensors, real-time and accurate monitoring of the temperature of several key components in the urea and fuel heating valve control pipeline can be achieved. The electronic control unit can promptly and accurately determine the heating demand based on these temperature signals and control the operation of the electronically controlled two-position three-way valve, thereby precisely adjusting the flow direction of the coolant to ensure that urea and fuel operate at the appropriate temperature. This not only achieves intelligent control of the urea and fuel heating process but also improves the response speed and control accuracy of the urea and fuel heating valve control pipeline and system, reducing underheating or overheating, thereby improving the overall performance and operating efficiency of the vehicle.

[0092] Based on the above embodiments, the multiple temperature sensors include a water temperature sensor, a urea temperature sensor, and an ambient temperature sensor.

[0093] Furthermore, a coolant temperature sensor can be installed in the relevant piping of the engine cooling system to accurately measure the temperature of the engine coolant. The engine coolant carries away the heat generated by the engine during its circulation, and its temperature directly reflects the engine's operating thermal state. By monitoring the coolant temperature, it can be determined whether the engine is within its normal operating temperature range and whether it is necessary to start or stop the heating of urea and fuel, thus preventing the engine from being affected by overheating or overcooling, which could impact performance and lifespan.

[0094] A urea temperature sensor can be installed on the urea tank to detect the temperature of the urea solution. Urea solution is prone to freezing at low temperatures, preventing the SCR system from injecting urea and resulting in ineffective control of nitrogen oxide emissions in the exhaust gas. Therefore, this sensor can provide real-time feedback on the urea temperature to promptly activate heating when the temperature is too low (e.g., below a preset temperature threshold) to prevent the urea solution from freezing. Optionally, the urea temperature sensor can be a standalone sensor on the urea tank, or it can be a composite sensor integrated with other sensors on the urea tank, such as a urea level, temperature, and mass sensor. This composite sensor can simultaneously and collaboratively achieve multi-functional, high-precision measurement of urea level, temperature, and mass (concentration) through a single sensor interface. The high integration of this composite sensor simplifies the structural design of the urea tank, saving space and cost.

[0095] An ambient temperature sensor can be installed in a suitable location on the exterior of the vehicle, such as the front panel or near the grille, to sense the temperature of the environment in which the vehicle is located. Ambient temperature has a significant impact on the state of urea and fuel. In low-temperature environments, the risk of urea solution freezing increases, and fuel flow becomes less efficient. Therefore, by monitoring the ambient temperature, the system can predict in advance whether urea and fuel need to be heated, achieving more intelligent and efficient control.

[0096] In one example, Figure 6A schematic diagram of the urea fuel heating valve control pipeline provided in the embodiments of this application. Figure 5 ,like Figure 6 As shown, the urea fuel heating valve control pipeline provided in this application mainly includes engine cooling pipelines (such as engine outlet 1, engine outlet pipe 2, engine return pipe 3, engine return port 4), urea nozzle cooling pipelines (such as urea nozzle 5, urea nozzle return pipe 6), two-position three-way valve 10, two-position three-way valve outlet pipe one 11 and two-position three-way valve outlet pipe two 12, urea heating pipelines (such as urea heating outlet pipe 8, urea heating inlet pipe 9), fuel heating pipelines (such as fuel heating inlet pipe 15, fuel heating outlet pipe 17), return water four-way connector 13, inlet water three-way connector 14, urea liquid level temperature mass sensor 7, and fuel liquid level sensor 16 in actual application.

[0097] The outlet of the engine cooling pipe (located at the engine outlet 1) is connected to the inlet of the urea nozzle cooling pipe (located at the pipe interface of the urea nozzle 5) through the engine outlet pipe 2.

[0098] The inlet of the two-position three-way valve 10 is connected to the outlet of the urea nozzle cooling pipe (located at the pipe interface of the urea nozzle 5) through the urea nozzle return pipe 6.

[0099] The first outlet of the two-position three-way valve 10 is connected to the inlet of the inlet three-way connector 14 through the outlet pipe 11 of the two-position three-way valve 10, and the second outlet of the two-position three-way valve 10 is connected to the first inlet of the return four-way connector 13 through the outlet pipe 12 of the two-position three-way valve 10.

[0100] The first outlet of the water inlet tee connector 14 is connected to the inlet of the urea heating pipeline via the urea heating water inlet pipe 9; the second outlet of the water inlet tee connector 14 is connected to the inlet of the fuel heating pipeline via the fuel heating water inlet pipe 15.

[0101] The second inlet of the return water four-way connector 13 is connected to the outlet of the urea heating pipeline through the urea heating outlet pipe 8; the third inlet of the return water four-way connector 13 is connected to the outlet of the fuel heating pipeline through the fuel heating outlet pipe 17; and the outlet of the return water four-way connector 13 is connected to the return end of the engine cooling pipeline (located at the engine return water port 4) through the engine return water pipe 3.

[0102] In addition, the urea liquid level and temperature mass sensor 7 is fixed between the urea heating outlet pipe 8 and the urea heating inlet pipe 9 to detect the urea temperature; the fuel level sensor 16 is fixed between the fuel heating inlet pipe 15 and the fuel heating outlet pipe 17 to detect the fuel temperature.

[0103] This application also provides a urea fuel heating system, which includes: the urea fuel heating valve control pipeline provided in the above embodiment. When the urea fuel heating valve control pipeline does not include an electronic control unit and multiple temperature sensors, the system may further include an electronic control unit and multiple temperature sensors; the two-position three-way valve in the urea fuel heating valve control pipeline is an electrically controlled two-position three-way valve; the electrically controlled two-position three-way valve and multiple temperature sensors are electrically connected to the electronic control unit; the multiple temperature sensors are used to detect the relevant temperature of the urea fuel heating valve control pipeline and output temperature signals; the electronic control unit is used to receive the temperature signals and send control signals to the electrically controlled two-position three-way valve in the urea fuel heating valve control pipeline, the control signals being used to control the opening and closing of the first and second water outlets of the electrically controlled two-position three-way valve.

[0104] The structure and function of the electronic control unit and multiple temperature sensors in the urea fuel heating system are similar to those in the electronic control unit and multiple temperature sensors in the urea fuel heating valve control pipeline provided in the above embodiment, and will not be described in detail here.

[0105] In one example, after the vehicle starts, the ambient temperature sensor, coolant temperature sensor, and urea temperature sensor transmit signals of ambient temperature, engine coolant temperature, and urea temperature to the electronic control unit (ECU), respectively. If the ambient temperature is below 5°C, the engine coolant temperature is above 60°C, and the urea temperature is below the target temperature, the ECU determines that the heating conditions are met and energizes the two-position three-way valve, opening its first outlet and closing its second outlet. At this time, the engine coolant flowing through the urea nozzle cooling pipe enters the urea heating pipe and fuel heating pipe in the heating pipe to heat the urea and fuel. When the urea temperature is above the target temperature and the engine coolant temperature is above the thermostat valve opening temperature, the ECU determines that heating is complete, shuts off the energization of the two-position three-way valve, and the valve returns to its initial state. The coolant no longer enters the heating pipe but flows directly back to the engine cooling pipe through the second outlet.

[0106] By integrating the urea fuel heating valve control pipeline with the electronic control unit and multiple temperature sensors into a complete urea fuel heating system, the system can accurately sense the temperature information of the engine coolant, urea solution, and the vehicle's environment in real time, and dynamically adjust the heating strategy based on this information. This effectively avoids the problems of urea solution freezing and poor fuel flow, and improves the reliability and stability of the system.

[0107] In some embodiments, the system may further include: a main controller, an instrument, a fuel switching valve, and a fuel level sensor; an electronic control unit, an instrument, a fuel switching valve, and a fuel level sensor are electrically connected to the main controller; the fuel switching valve is used to output switching status information; the fuel level sensor is used to output a fuel level signal; the electronic control unit is also used to receive the switching status information and the fuel level signal, and output fuel tank switching prompt information; the main controller is used to transmit the switching status information and the fuel level signal to the electronic control unit; and to transmit the fuel tank switching prompt information to the instrument; the instrument is used to display the fuel tank switching prompt information.

[0108] The main controller is the core coordinating component of the entire urea fuel heating system, playing a crucial role in data relay and command issuance. It receives signals from the fuel switching valve and fuel level sensor, and transmits these signals to the electronic control unit (ECU). Simultaneously, it receives fuel tank switching prompts from the ECU and transmits them to the instrument panel for display.

[0109] The instrument panel is an important interface for the driver to interact with the system, displaying various vehicle information, such as fuel tank switching prompts output by the electronic control unit, so that the driver can understand the fuel tank status in a timely manner and take appropriate actions, such as switching fuel tanks.

[0110] A fuel switching valve is a device that can change the fuel supply path. It typically has multiple operating states and can control the output of fuel from the main fuel tank or the auxiliary fuel tank. It can also inform the system of the current fuel supply source by outputting switching status information.

[0111] A fuel level sensor is installed inside the fuel tank to monitor the fuel level in real time. It converts the fuel level information into an electrical signal output, helping the system understand the remaining fuel in the tank and thus determine whether operations such as switching fuel tanks are necessary.

[0112] In this embodiment, a fuel level sensor continuously monitors the fuel level in the fuel tank and converts the level signal into an electrical signal. The fuel switching valve outputs switching status information based on its operating state. The main controller receives this information and transmits it to the electronic control unit (ECU). Upon receiving the switching status information and the fuel level signal, the ECU analyzes the data according to its internal preset program and logic. For example, if the fuel switching valve indicates that the auxiliary fuel tank is currently supplying fuel, and the fuel level sensor detects that the main fuel tank level is higher than the alarm value, the ECU will determine that a fuel tank switching prompt is required. When a prompt is generated, the main controller receives and transmits the fuel tank switching prompt information output by the ECU to the instrument cluster. Upon receiving the fuel tank switching prompt information, the instrument cluster displays it in the corresponding display area, reminding the driver to perform the fuel tank switching operation.

[0113] Optionally, the urea fuel heating system may also include a power source and wiring; wherein the power source supplies power to the electronic control unit, the electronically controlled two-position three-way valve, multiple temperature sensors, the main controller, the instrument panel, the fuel switching valve, and the fuel level sensor via the wiring.

[0114] Figure 7 This is a schematic diagram of the structure of a urea fuel heating system provided in an embodiment of this application, as shown below. Figure 7 As shown, the instrument cluster and fuel switching valve are connected to the main controller via a bus; the fuel level sensor is connected to the main controller via a hardwired connection; the main controller is connected to the electronic control unit (ECU) via a controller area network (CAN); the water temperature sensor, urea temperature sensor, and ambient temperature sensor are each connected to the ECU via hardwired connections, and the urea temperature sensor can also be connected to the ECU via CAN; the ECU is connected to the two-position three-way valve via a DC (Driver Circuit) to control the connection of the two-position three-way valve. The urea fuel heating valve control pipeline connected to the two-position three-way valve has a similar structure to the urea fuel heating valve control pipeline provided in the above embodiment, and will not be described again here.

[0115] Based on the above embodiments, Figure 8 This is a schematic diagram of the execution flow of a urea fuel heating system provided in an embodiment of this application, as shown below. Figure 8 As shown, after the vehicle starts, the ECU obtains the current water temperature, current urea temperature and current ambient temperature through the water temperature sensor, urea temperature sensor and ambient temperature sensor respectively; based on the preset control logic and these obtained temperatures, the ECU generates and sends control signals to the electronically controlled two-position three-way valve.

[0116] Furthermore, in the application of this application, the working principle of opening the heating solenoid valve can be as follows: when the current ambient temperature is less than or equal to the ambient temperature threshold (e.g., 5°C), and the current water temperature is greater than or equal to the first water temperature threshold (e.g., 60°C), and the current urea temperature is less than or equal to the target urea temperature (e.g., T1), the heating solenoid valve is opened, that is, the ECU outputs a control signal to the two-position three-way valve to open the first water outlet and close the second water outlet; or, when the current ambient temperature is less than or equal to the ambient temperature threshold (e.g., 5°C), and the current water temperature is greater than or equal to the first water temperature threshold (e.g., 60°C), and the current urea temperature is greater than the target urea temperature (e.g., T1), and the current water temperature is less than the second water temperature threshold (e.g., T2), the heating solenoid valve is opened, that is, the ECU outputs a control signal to the two-position three-way valve to open the first water outlet and close the second water outlet.

[0117] The working principle of closing the heating solenoid valve can be as follows: when the current ambient temperature is greater than the ambient temperature threshold (such as 5℃), the heating solenoid valve is closed, that is, the ECU outputs a control signal to the two-position three-way valve to close the first water outlet and open the second water outlet.

[0118] When the current ambient temperature is less than or equal to the ambient temperature threshold (e.g., 5℃) and the current water temperature is less than the first water temperature threshold (e.g., 60℃), the heating solenoid valve is closed. That is, the ECU outputs a control signal to the two-position three-way valve to shut off the first water outlet and open the second water outlet.

[0119] In addition, during the application of this application, the ECU may also include the judgment of fuel supply to the fuel tank, for example: (1) when the current ambient temperature is less than or equal to the ambient temperature threshold (e.g., 5°C), and the current water temperature is greater than or equal to the first water temperature threshold (e.g., 60°C), and the current urea temperature is greater than the target urea temperature (e.g., T1), and the current water temperature is greater than or equal to the second water temperature threshold (e.g., T2), the switching status information is judged; (2) when the switching status information indicates that the main fuel tank is supplied with fuel, the heating solenoid valve is closed; when the switching status information indicates that the auxiliary fuel tank is supplied with fuel, the main fuel tank level corresponding to the output level signal is judged to be greater than or equal to the preset level threshold (e.g., H1); (3) when the main fuel tank level is greater than or equal to the preset level threshold (e.g., H1), fuel tank switching prompt information is generated and output, the instrument prompts the switching of the fuel tank, and the heating solenoid valve is closed; when the main fuel tank level is less than the preset level threshold (e.g., H1), the heating solenoid valve is closed.

[0120] Since the volumes of the vehicle's fuel tank and urea tank differ, the correlation between urea temperature and fuel temperature at the target coolant temperature needs to be calibrated when matching fuel and urea tanks of different volumes. This calibration determines the target urea temperature for controlling the on / off cycle of urea heating. Calibration of the target urea temperature allows for a dynamic balance between urea heating and fuel heating, preventing overheating or underheating caused by controlling a single parameter. It also makes the system adaptable to fuel / urea tanks with different volume ratios.

[0121] It should be noted that the detection and control signal generation methods in the above embodiments are common technologies in sensors and electronic control units. For example, threshold comparison algorithms are basic methods of system control. Therefore, the above embodiments are functional examples of the urea fuel heating valve control pipeline and urea fuel heating system of this application, rather than limiting the specific implementation method. The same function can be achieved through equivalent logic (such as state machine, fuzzy control). As long as the opening and closing of the first and second outlets of the two-position three-way valve are realized, the actual effect of "low temperature heating and high temperature stopping" can be achieved in practical applications.

[0122] Therefore, in the application of this application, the urea nozzle cooling inlet can be connected to the engine outlet; the urea nozzle cooling outlet can be connected to the inlet of the two-position three-way valve; the first outlet of the two-position three-way valve can be connected to the urea heating and fuel heating inlet ports through the inlet three-way connector; the urea heating and fuel heating are heated after water enters through the inlet three-way connector, and the heated coolant flows back to the engine return port through the return four-way connector; the second outlet of the two-position three-way valve can be connected to the engine return port through the return four-way connector.

[0123] Furthermore, to achieve automatic control and regulation and improve control efficiency, it is also necessary to integrate related components such as the ECU, power supply, wiring, and temperature sensors. For example, the engine thermostat's coolant temperature sensor, the urea tank's urea temperature sensor, and the ambient temperature sensor on the vehicle's front panel can be connected to the ECU. Figure 7 As shown.

[0124] The control method for a two-position three-way valve during operation can be as follows: Figure 8 As shown, after the vehicle starts, if the ambient temperature is below 5℃ and the engine coolant temperature is above 60℃, the ECU energizes the two-position three-way valve to activate the urea heater and fuel tank heater. When the urea temperature is above the target temperature T1 and the engine coolant temperature is above the thermostat valve opening temperature T2, the urea heater and fuel tank heater are deactivated. The status of the fuel switching valve is checked. If the auxiliary fuel tank is supplying fuel and the main fuel tank level is above the alarm value H1, the instrument panel prompts to switch the main fuel tank. When the urea temperature is below the target temperature T1 or the engine coolant temperature is below the thermostat valve opening temperature T2, the heating solenoid valve is activated.

[0125] Therefore, this application can increase the flow rate of the urea heating pipeline; it has low error prevention requirements, and can work normally as long as the two-position three-way pipeline is correctly connected, reducing assembly difficulty; it eliminates the fuel tank heating water shut-off valve to reduce costs and driver operation; the instrument prompts the switching of the main and auxiliary fuel tanks, avoiding premature switching that may cause fuel line blockage or waste of low-grade diesel fuel due to over-switching.

[0126] This application also provides a vehicle, which includes an engine, a urea tank, a fuel tank, and the urea fuel heating system provided in the above embodiments; the urea fuel heating system is integrated with the engine's cooling system and is used to heat the urea in the urea tank and the fuel in the fuel tank.

[0127] Furthermore, the engine cooling pipes in the urea fuel heating system can be integrated with the engine cooling system for circulating engine coolant; the urea heating pipes in the urea fuel heating system are used to heat the urea in the urea tank; and the fuel heating pipes in the urea fuel heating system are used to heat the fuel in the fuel tank.

[0128] The structure and function of the urea fuel heating system in this embodiment are similar to those of the urea fuel heating system provided in the above embodiments, and will not be described in detail here.

[0129] The embodiments described in this specification are presented in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0130] It should be noted that the embodiments referred to in the specification, such as "one embodiment," "implementation," "exemplary embodiment," and "some embodiments," may include specific features, structures, or characteristics, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when describing a specific feature, structure, or characteristic in conjunction with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0131] Generally speaking, terms should be understood at least in part by their use in context. For example, at least in part by context, the term "one or more" as used in the text can be used to describe any feature, structure, or characteristic of the singular meaning, or a combination of features, structures, or characteristics of the plural meaning. Similarly, at least in part by context, terms such as "a" or "the" can also be understood to convey either singular or plural usage.

[0132] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A urea fuel heating valve control line, characterized in that, It includes engine cooling pipes, urea injector cooling pipes, heating pipes, and a two-position three-way valve; the heating pipes include urea heating pipes and fuel heating pipes; The outlet end of the engine cooling pipe is connected to the inlet end of the urea nozzle cooling pipe; The inlet of the two-position three-way valve is connected to the outlet of the urea nozzle cooling pipe; the first outlet of the two-position three-way valve is connected to the inlet of the heating pipe; and the second outlet of the two-position three-way valve is connected to the return end of the engine cooling pipe. The outlet end of the heating pipe is connected to the return end of the engine cooling pipe; When urea and fuel are heated, the first outlet of the two-position three-way valve is opened and the second outlet of the two-position three-way valve is closed, so that the engine coolant flowing through the urea nozzle cooling pipe enters the urea heating pipe and the fuel heating pipe in the heating pipe, thereby heating the urea and fuel.

2. A urea fuel heating valve rail according to claim 1, characterized in that, The urea heating pipeline and the fuel heating pipeline are connected in parallel or in series.

3. A urea fuel heating valve rail according to claim 1, characterized in that, The urea heating pipeline and the fuel heating pipeline are connected in parallel; the urea and fuel heating valve control pipeline also includes: a water inlet tee connector; The inlet end of the inlet tee is connected to the first outlet end of the two-position tee valve; The first outlet end of the inlet tee is connected to the inlet end of the urea heating pipe; The second outlet of the inlet tee is connected to the inlet of the fuel heating pipe.

4. A urea fuel heating valve rail according to claim 3, characterised in that, The urea fuel heating valve control pipeline also includes: a return water four-way connector; The first inlet end of the return water four-way connector is connected to the second outlet end of the two-position three-way valve; The second inlet of the return water four-way connector is connected to the outlet of the urea heating pipeline; The third inlet of the return water four-way connector is connected to the outlet of the fuel heating pipe. The outlet end of the return water four-way connector is connected to the return water end of the engine cooling pipe.

5. Urea fuel heating valve rail according to any of claims 1 - 4, characterized in that, The two-position three-way valve is an electrically controlled two-position three-way valve, and the urea fuel heating valve control pipeline further includes: an electronic control unit; the control signal output terminal of the electronic control unit is electrically connected to the signal input terminal of the electrically controlled two-position three-way valve; The electronic control unit is used to send control signals to the electrically controlled two-position three-way valve, and the control signals are used to control the opening and closing of the first outlet and the second outlet of the electrically controlled two-position three-way valve.

6. A urea fuel heating valve rail according to claim 5, characterised in that, The urea fuel heating valve control pipeline also includes: multiple temperature sensors electrically connected to the electronic control unit; The plurality of temperature sensors are used to detect the relevant temperature of the urea fuel heating valve control pipeline and output temperature signals; The electronic control unit is used to receive the temperature signal and send a control signal to the electrically controlled two-position three-way valve.

7. A urea fuel heating valve rail according to claim 6, characterised in that, The multiple temperature sensors include a water temperature sensor, a urea temperature sensor, and an ambient temperature sensor.

8. A urea fuel heating system characterized by, Includes the urea fuel heating valve control line as described in any one of claims 1-7.

9. A urea fuel heating system according to claim 8, characterised in that, When the system includes the urea fuel heating valve control line as described in any one of claims 1-4, the system further includes an electronic control unit and multiple temperature sensors; The two-position three-way valve in the urea fuel heating valve control pipeline is an electrically controlled two-position three-way valve. The electrically controlled two-position three-way valve and the plurality of temperature sensors are respectively electrically connected to the electronic control unit; The plurality of temperature sensors are used to detect the relevant temperature of the urea fuel heating valve control pipeline and output temperature signals; The electronic control unit is used to receive the temperature signal and send a control signal to the electrically controlled two-position three-way valve in the urea fuel heating valve control pipeline. The control signal is used to control the opening and closing of the first and second water outlets in the electrically controlled two-position three-way valve.

10. A vehicle, characterized in that, include: An engine, a urea tank, a fuel tank, and a urea fuel heating system as described in claim 8 or 9; The urea fuel heating system is integrated with the engine cooling system and is used to heat the urea in the urea tank and the fuel in the fuel tank.

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