Urea solution heating device, engine assembly and vehicle

Abstract

The utility model discloses a urea solution heating device, an engine assembly and a vehicle, and relates to the technical field of heating devices.The urea solution heating device comprises a urea box; a gas-phase heat exchange piece is arranged in the urea box, a gas inlet of the gas-phase heat exchange piece penetrates through an engine cylinder cover through a gas inlet pipe to be communicated with an engine combustion chamber in the engine cylinder cover, or the gas inlet of the gas-phase heat exchange piece is communicated with an engine explosion pressure measuring channel through the gas inlet pipe; a gas outlet of the gas phase heat exchange piece is communicated with an exhaust pipeline of the engine through a gas outlet pipe; a first electromagnetic valve, a pressure limiting valve and a pressure reducing valve are sequentially arranged on the air inlet pipe in the air circulation direction, a second electromagnetic valve is arranged on the air outlet pipe, and the first electromagnetic valve and the second electromagnetic valve are in signal connection with the controller. The urea solution in the urea box can be rapidly heated, and the heating efficiency is improved; carbon black particles can be discharged, and the service life of a heating gas path is prolonged. Meanwhile, the utility model further discloses an engine assembly and a vehicle.

Description

TECHNICAL FIELD

[0001] The utility model relates to heating device technical field especially relates to a kind of urea solution heating device, engine assembly and vehicle. BACKGROUND

[0002] China's territory is vast, and the temperature difference between north and south is large in winter. In some areas of the three northeastern provinces, the minimum temperature in winter can drop to below -35℃, while the freezing point of urea solution is only about -11℃. In the winter of the north, such environmental temperature can cause the urea solution to completely freeze, so that the SCR system cannot normally inject urea, thereby causing the emission of nitrogen oxides to be difficult to effectively control.

[0003] To ensure the stable operation of the SCR system in winter, the main measure currently adopted is to heat and insulate the urea storage unit and related pipelines. The heating mode of the urea tank and the urea supply system is usually different. At present, the urea tank is heated by flowing cooling liquid through the heating pipe and conducting convective heat exchange with the urea. When the electronic control unit (ECU) determines that the urea needs to be thawed (i.e. the temperature is lower than the set value) according to the monitoring data of the urea tank temperature sensor and the ambient temperature sensor, the ECU will open the cooling liquid solenoid valve in the pipeline to make the cooling liquid flow into the urea tank for convective heat exchange. The supply pipeline generally uses electric heating.

[0004] Since the volume of the urea tank is relatively large, it takes a lot of energy to raise its temperature from a low value to a high level, and the water flow rate flowing into the urea tank is directly related to the running speed of the engine. When the engine speed is low, the water flow rate into the urea tank is small, and the convective heat exchange speed is slow, which can easily lead to a long thawing time of the urea tank, and even the thawing process may not be completed successfully within the 70 minutes specified by the regulations. In addition, since the volume of urea solution in the urea tank varies, the energy required for thawing the urea tank also varies.

[0005] Currently, water (cooling liquid) heating, electric heating and waste gas heating are commonly used, but the existing heating methods have the following disadvantages:

[0006] 1) The water heating mode is significantly affected by the engine speed. When the engine is running at a low speed for a long time, the water flow rate into the urea tank will decrease significantly, which will greatly reduce the convective heat exchange efficiency in the tank, thereby there is a potential risk of failure of the urea tank thawing within the specified time, which may cause the SCR system to fail to work in time, hindering the reduction process of nitrogen oxides.

[0007] 2) The amount of urea needed to be thawed in the urea tank is huge, if only relying on the electric heating method to achieve thawing, it will produce great power consumption. In this way, not only will it have an adverse effect on the normal use of the battery, shorten its service life and possibly cause vehicle start-up problems, but it will also cause the fuel economy of the vehicle to be greatly reduced, increasing the operating cost and energy consumption burden of the vehicle.

[0008] 3) The exhaust gas discharged from the turbine will gradually deposit and clog the heating gas path as it entrains a large number of carbon black particles when flowing through the heating gas path. With the passage of time, its heating efficiency for the urea tank will continue to decrease, and in severe cases, it can even cause the gas path to be completely clogged, ultimately resulting in the failure of the urea tank to thaw, causing the SCR system to be paralyzed and unable to effectively control nitrogen oxide emissions, adversely affecting the environment. Practical new type content

[0009] Therefore, the technical problem to be solved by the present application is to provide a urea solution heating device, an engine assembly and a vehicle, which can quickly warm and heat the urea solution in the urea tank, improve the heating efficiency, and facilitate the discharge of carbon black particles and prolong the service life of the heating gas path.

[0010] To solve the above technical problems, the technical scheme of the present application is:

[0011] A urea solution heating device, comprising a urea tank;

[0012] The gas phase heat exchange element is provided in the urea tank, the gas inlet of the gas phase heat exchange element is communicated with the engine combustion chamber in the engine cylinder head through the gas inlet pipe, or the gas inlet of the gas phase heat exchange element is communicated with the engine burst pressure measurement channel through the gas inlet pipe; the gas outlet of the gas phase heat exchange element is communicated with the exhaust pipe of the engine through the gas outlet pipe;

[0013] The gas inlet pipe is provided with an electromagnetic valve one, a pressure limiting valve and a pressure reducing valve in sequence along the gas flow direction, the gas outlet pipe is provided with an electromagnetic valve two, and the electromagnetic valve one and the electromagnetic valve two are respectively connected with the controller signal.

[0014] Preferably, the gas phase heat exchange element is an integral structure, the gas phase heat exchange element comprises a gas inlet section communicated with the gas inlet pipe, a gas outlet section communicated with the gas outlet pipe, and a connecting section communicated between the gas inlet section and the gas outlet section;

[0015] The gas inlet section and the gas outlet section are vertically arranged, the connecting section is arranged at the bottom of the gas inlet section and the gas outlet section, and the connecting section is arranged close to the bottom of the urea tank.

[0016] Preferably, the gas inlet section is a spiral pipeline spirally extending from the gas inlet pipe towards the connecting section, and the gas outlet section is a spiral pipeline spirally extending from the connecting section towards the gas outlet pipe.

[0017] Preferably, the connecting section is a spiral pipeline spirally extending from the gas inlet section towards the gas outlet section.

[0018] Preferably, the gas phase heat exchange member is in a U-shaped structure.

[0019] Preferably, the pressure limiting range of the pressure limiting valve is a, the compression pressure of the engine compression stroke is b, and the engine explosion pressure is c; c>a>b.

[0020] Preferably, the urea tank is provided with a urea tank temperature sensor and a urea tank liquid level gauge, and the urea tank temperature sensor and the urea tank liquid level gauge are respectively signal connected with the controller.

[0021] Preferably, the application further comprises an ambient temperature sensor, a urea pump, a urea injection amount sensor, and a nitrogen oxide sensor, and the ambient temperature sensor, the urea pump, the urea injection amount sensor, and the nitrogen oxide sensor are respectively signal connected with the controller.

[0022] The engine assembly comprises an engine body, and the engine body is provided with the urea solution heating device.

[0023] The vehicle comprises the engine assembly.

[0024] After the above technical scheme is adopted, the application has the following beneficial effects:

[0025] The application discloses a urea solution heating device, an engine assembly, and a vehicle. The urea solution heating device comprises a urea tank. A gas phase heat exchange member is arranged in the urea tank. An air inlet of the gas phase heat exchange member is communicated with an engine combustion chamber in the engine cylinder head through a gas inlet pipe, or the air inlet of the gas phase heat exchange member is communicated with an engine explosion pressure measurement channel through the gas inlet pipe. An air outlet of the gas phase heat exchange member is communicated with an engine exhaust pipeline through a gas outlet pipe. An electromagnetic valve one, a pressure limiting valve, and a pressure reducing valve are sequentially arranged on the gas inlet pipe along a gas flow direction. An electromagnetic valve two is arranged on the gas outlet pipe. The electromagnetic valve one and the electromagnetic valve two are respectively signal connected with a controller. When it is necessary to heat urea solution in the urea tank, the controller controls the electromagnetic valve one and the electromagnetic valve two to be opened at the same time. High-temperature and high-pressure gas in the engine combustion chamber is discharged into the gas inlet pipe through the engine explosion pressure measurement channel or directly into the gas inlet pipe, and then enters the gas phase heat exchange member. The urea solution is heated, warmed, and thawed by the gas phase heat exchange member. After heat exchange, the gas is discharged into the engine exhaust pipeline through the gas outlet pipe and is directly discharged or participates in work on a turbocharger.

[0026] In the process, the gas taking position of the gas phase heat exchange element is the engine combustion chamber, and the obtained gas is high-temperature and high-pressure gas, rather than exhaust gas in the engine exhaust pipeline. The high-temperature and high-pressure gas obtained by the application has a temperature and pressure greater than the temperature and pressure of the exhaust gas, so that the urea solution in the urea tank can be heated and warmed more quickly, meeting the requirement of successfully completing thawing within 70 minutes defined by regulations. Moreover, the higher pressure is more conducive to the discharge of carbon black particles, which can prolong the service life of the gas phase heat exchange element. At the same time, the installation of the pressure limiting valve and the pressure reducing valve can keep the high-temperature and high-pressure gas in the combustion chamber within a stable pressure range, which will not affect the normal compression and intake stroke of the engine, ensuring the stable operation of the engine. BRIEF DESCRIPTION OF DRAWINGS

[0027] The utility model will be further described below in combination with the drawings and examples.

[0028] Figure 1 is the structure schematic diagram of urea solution heating device of the utility model embodiment;

[0029] In the drawings:

[0030] 1, urea tank;

[0031] 2, gas phase heat exchange element;21, intake section;22, outlet section;23, connecting section;

[0032] 3, intake pipe;

[0033] 4, outlet pipe;

[0034] 51, electromagnetic valve one;52, pressure limiting valve;53, pressure reducing valve;54, electromagnetic valve two;55, controller;

[0035] 61, urea tank temperature sensor;62, urea tank liquid level gauge;

[0036] 71, ambient temperature sensor;72, urea pump;73, urea injection amount sensor;74, nitrogen oxide sensor. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical scheme and advantages of the utility model more clear, the utility model will be further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the utility model, and are not used to limit the utility model.

[0038] Example one

[0039] As Figure 1As shown, the application discloses a urea solution heating device, which comprises a urea tank 1; a gas phase heat exchange part 2 is arranged in the urea tank 1; an air inlet of the gas phase heat exchange part 2 is communicated with an engine combustion chamber in the engine cylinder cover through an air inlet pipe 3, or the air inlet of the gas phase heat exchange part 2 is communicated with an engine burst pressure measurement channel (not shown in the figure) through the air inlet pipe 3; an air outlet of the gas phase heat exchange part 2 is communicated with an engine exhaust pipe through an air outlet pipe 4; the air inlet pipe 3 is sequentially provided with a solenoid valve one 51, a pressure limiting valve 52 and a pressure reducing valve 53 along the gas flow direction; the air outlet pipe 4 is provided with a solenoid valve two 54; the solenoid valve one 51 and the solenoid valve two 54 are respectively signal connected with a controller 55.

[0040] In the application, when the urea solution in the urea tank 1 needs to be heated, the controller 55 controls the solenoid valve one 51 and the solenoid valve two 54 to be opened at the same time; high-temperature and high-pressure gas in the engine combustion chamber is discharged into the air inlet pipe 3 through the engine burst pressure measurement channel or directly enters the air inlet pipe 3, and then enters the gas phase heat exchange part 2, so as to heat and thaw the urea solution through the gas phase heat exchange part 2; the heat-exchanged gas is discharged into the engine exhaust pipe through the air outlet pipe 4, and is directly discharged or participates in the work of the turbocharger. The engine burst pressure measurement channel is a measurement channel arranged on the engine, and is in a closed state when the burst pressure is not measured; if the engine burst pressure measurement channel is used, the combustion chamber of the engine can be directly communicated with the air inlet pipe 3.

[0041] In the process of heating the urea solution, the gas taking position of the gas phase heat exchange part 2 is the engine combustion chamber, and the obtained gas is high-temperature and high-pressure gas, instead of exhaust gas in the engine exhaust pipe; the temperature and the pressure of the high-temperature and high-pressure gas obtained by the application are both greater than the temperature and the pressure of the exhaust gas, so that the urea solution in the urea tank 1 can be heated and thawed more quickly, and the requirement of successfully completing thawing within 70 minutes defined by regulations can be met; in addition, the higher pressure is more conducive to the discharge of carbon black particles, and can prolong the service life of the gas phase heat exchange part 2; at the same time, the installation of the pressure limiting valve 52 and the pressure reducing valve 53 can keep the high-temperature and high-pressure gas in the combustion chamber in a pressure stable range, and will not affect the normal compression and intake stroke of the engine, so as to ensure the stable operation of the engine.

[0042] The gas phase heat exchange part 2 is an integrated structure, and the gas phase heat exchange part 2 comprises an air inlet section 21 communicated with the air inlet pipe 3, an air outlet section 22 communicated with the air outlet pipe 4, and a connecting section 23 communicated between the air inlet section 21 and the air outlet section 22; preferably, the air inlet section 21 and the air outlet section 22 are vertically arranged, the connecting section 23 is arranged at the bottom of the air inlet section 21 and the air outlet section 22, and the connecting section 23 is arranged close to the bottom of the urea tank 1.

[0043] Preferably, the gas inlet section 21 is a spiral pipeline spirally extending from the gas inlet pipe 3 towards the connecting section 23, the gas outlet section 22 is a spiral pipeline spirally extending from the connecting section 23 towards the gas outlet pipe 4, and the connecting section 23 is a spiral pipeline spirally extending from the gas inlet section 21 towards the gas outlet section 22. By arranging the gas inlet section 21, the gas outlet section 22 and the connecting section 23 as spiral pipelines, although the path of the gas flow is increased, the contact area between the gas phase heat exchange element 2 and the urea solution is increased, the heating efficiency is improved, and the heating speed is improved. Moreover, the high-temperature and high-pressure gas in the combustion chamber has a relatively high pressure itself, and will not affect the discharge of the carbon black particles.

[0044] Alternatively, the gas phase heat exchange element 2 has a U-shaped structure, which allows the gas to quickly pass through the gas phase heat exchange element 2 without affecting the gas pressure, and facilitates the rapid heating and thawing of the urea solution with a low freezing degree.

[0045] For the pressure limiting valve 52 of the present application, the pressure limiting range of the pressure limiting valve 52 is defined as a, the compression pressure of the engine compression stroke is b, and the engine explosion pressure is c; c > a > b. Thus, the high-temperature and high-pressure gas in the combustion chamber can be obtained, which belongs to only a small section at the end of the gas combustion, and will not affect the normal compression and intake stroke of the engine. Compared with the gas taken from the rear of the turbine, the pressure is larger, the gas flow is faster, and the temperature is higher, which can heat the urea solution faster.

[0046] Preferably, the urea tank 1 is provided with a urea tank temperature sensor 61 and a urea tank liquid level gauge 62, and the urea tank temperature sensor 61 and the urea tank liquid level gauge 62 are respectively signal connected with the controller 55. The urea tank temperature sensor 61 is used to detect the temperature of the urea solution, the urea tank liquid level gauge 62 is used to detect the liquid level of the urea solution, and the controller 55 is an ECU.

[0047] It also includes an ambient temperature sensor 71, a urea pump 72, a urea injection amount sensor 73, and a nitrogen oxide sensor 74, which are respectively signal connected with the controller 55. The ambient temperature sensor 71 is used to detect the ambient temperature outside the urea tank 1, the urea pump 72 is used to inject the urea solution, the urea injection amount sensor 73 is used to detect the injection amount of the urea solution, and the nitrogen oxide sensor 74 is used to detect the nitrogen oxide content in the engine exhaust gas.

[0048] In the present application, when the vehicle is running, the ambient temperature, the temperature of the urea solution, the urea solution injection amount, the working state of the urea pump, the liquid level of the urea solution and the content of nitrogen oxides are monitored by the controller 55. If the controller 55 detects that the ambient temperature and the temperature of the urea solution are lower than the set value (for example, -18°C or -11°C), the liquid level of the urea solution is higher than the set value, the urea pump is in the working state, and the urea solution injection amount is lower than the set value (this value is related to the ECU data and can be set independently according to the emission requirements of different models), and the content of nitrogen oxides is continuously increasing, it indicates that the urea solution is currently in a frozen state. At this time, the electromagnetic valve one 51 and the electromagnetic valve two 54 are opened at the same time to introduce the high-temperature and high-pressure gas in the combustion chamber into the urea tank 1, so as to promote the rapid thawing of the solution.

[0049] When the set time is exceeded, or the engine combustion performance is affected, or in the engine speed rising stage, torque rising stage, accelerator pedal is continuously depressed, or the engine load rate exceeds the set value, it indicates that the engine needs power output at this time. The electromagnetic valve one 51 and the electromagnetic valve two 54 are closed at the same time. The set time mentioned here refers to the pre-set time for heating the urea solution.

[0050] Compared with the traditional water (cooling liquid) heating, electric heating and exhaust gas heating methods, the present application has at least the following advantages:

[0051] 1. Fast heating; the traditional water heating method is easily affected by the engine speed, while the present application directly takes the high-temperature and high-pressure gas from the combustion chamber, which is not affected by the engine speed;

[0052] 2. Low cost; it does not affect the service life of the battery and the fuel economy of the vehicle, reducing the cost and energy consumption burden;

[0053] 3. Easy to discharge carbon black particles; the present application takes gas from the combustion chamber, which contains less carbon black particles than exhaust gas. At the same time, it is high-temperature and high-pressure gas, which is beneficial to the discharge of carbon black particles and can prolong the service life of the gas phase heat exchange element 2. The high temperature can improve the heating efficiency of the urea tank 1.

[0054] Example two

[0055] The present application discloses an engine assembly, which comprises an engine body and a urea solution heating device as described in the above embodiments. The engine body is a known technology in the technical field, and its specific structure is not described here.

[0056] Example three

[0057] The present application discloses a vehicle comprising an engine assembly as described in the above embodiments.

[0058] The above merely describes the preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A urea solution heating device, characterized by, The urea tank (1) is provided with a gas phase heat exchange element (2), an air inlet of the gas phase heat exchange element (2) is communicated with an engine combustion chamber inside an engine cylinder cover through an air inlet pipe (3), or the air inlet of the gas phase heat exchange element (2) is communicated with an engine burst pressure measuring channel through the air inlet pipe (3); an air outlet of the gas phase heat exchange element (2) is communicated with an engine exhaust pipe through an air outlet pipe (4); The air inlet pipe (3) is sequentially provided with an electromagnetic valve one (51), a pressure limiting valve (52) and a pressure reducing valve (53) along a gas flow direction, the air outlet pipe (4) is provided with an electromagnetic valve two (54), the electromagnetic valve one (51) and the electromagnetic valve two (54) are respectively signal connected with a controller (55). The gas phase heat exchange element (2) is an integral structure, the gas phase heat exchange element (2) comprises an air inlet section (21) communicated with the air inlet pipe (3), an air outlet section (22) communicated with the air outlet pipe (4), and a connecting section (23) communicated between the air inlet section (21) and the air outlet section (22).

2. The urea solution heating apparatus according to claim 1, characterized by The air inlet section (21) and the air outlet section (22) are vertically arranged, the connecting section (23) is arranged at the bottom of the air inlet section (21) and the air outlet section (22), and the connecting section (23) is arranged close to the bottom of the urea tank (1). The air inlet section (21) is a spiral pipeline spirally extending from the air inlet pipe (3) to the connecting section (23), and the air outlet section (22) is a spiral pipeline spirally extending from the connecting section (23) to the air outlet pipe (4).

3. The urea solution heating apparatus according to claim 2, wherein The connecting section (23) is a spiral pipeline spirally extending from the air inlet section (21) to the air outlet section (22).

4. The urea solution heating apparatus according to claim 2, wherein The gas phase heat exchange element (2) is a U-shaped structure.

5. The urea solution heating apparatus according to claim 2, wherein The pressure limiting range of the pressure limiting valve (52) is a, the compression pressure of the engine itself compression stroke is b, and the engine burst pressure is c; c>a>b.

6. The urea solution heating apparatus according to claim 1, wherein The urea tank (1) is provided with a urea tank temperature sensor (61) and a urea tank liquid level gauge (62), and the urea tank temperature sensor (61) and the urea tank liquid level gauge (62) are respectively signal connected with the controller (55).

7. The urea solution heating apparatus according to claim 1, wherein Further comprising an ambient temperature sensor (71), a urea pump (72), a urea injection amount sensor (73) and a nitrogen oxide sensor (74), and the ambient temperature sensor (71), the urea pump (72), the urea injection amount sensor (73) and the nitrogen oxide sensor (74) are respectively signal connected with the controller (55).

8. The urea solution heating apparatus according to claim 7, wherein The engine assembly comprises an engine body, and the engine body is provided with the urea solution heating device according to any one of claims 1 to 8.

9. An engine assembly characterised in that, The engine assembly according to claim 9.

10. Vehicle, characterized in that ​

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