Method, device and vehicle for controlling the temperature of a urea solution

Abstract

The application provides a urea solution temperature control method and device and a vehicle. The method comprises the following steps: obtaining a urea solution temperature, which is the current temperature of the urea solution in a urea container; in the case that the urea solution temperature is less than a thawing threshold, controlling a first blocking valve to open until the urea solution temperature is greater than or equal to the thawing threshold, so that the exhaust gas of an engine heats the urea solution through a gas guide pipe; the thawing threshold is the minimum temperature that meets the urea solution injection requirement; in the case that the urea solution temperature is greater than a deterioration threshold, controlling a fan to open until the urea solution temperature is less than or equal to the deterioration threshold, so that the fan air-cools the urea solution; the deterioration threshold is the maximum temperature of the urea solution that does not affect the exhaust gas treatment, thereby solving the problem that the temperature of the urea solution is difficult to control in the prior art, which leads to poor exhaust gas treatment effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tail gas treatment, in particular to a urea solution temperature control method and device, a computer readable storage medium and a vehicle. BACKGROUND

[0002] The current mainstream technology is to draw the pipeline outside from the engine coolant, and the coolant is heated at the engine end and then flows to the internal pipeline of the urea tank to thaw the urea solution. In low-temperature areas, after the urea solution is thawed, the related reactions are completed through the SCR device to reduce the pollution degree of the exhaust emissions.

[0003] The current common urea thawing method is to use the coolant in the internal thawing pipeline of the urea tank to heat through the heat of the coolant. However, through observation and analysis of market vehicles, it is found that the urea cannot be thawed within the specified time, and the situation of affecting urea injection still occurs, which affects the tail gas treatment. Therefore, it can be tried to use a higher temperature heat transfer medium or install other thawing devices. In addition, due to the uncertain environment of vehicle operation, when the vehicle runs in a high-temperature area, the urea temperature is affected by the environment temperature, the high temperature causes the urea to deteriorate, and then affects the efficient treatment of nitrogen oxides in the exhaust gas. SUMMARY

[0004] The main purpose of the present application is to provide a urea solution temperature control method and device, a computer readable storage medium and a vehicle to at least solve the problem that the temperature of the urea solution is difficult to control in the prior art, which leads to poor tail gas treatment effect.

[0005] To achieve the above object, according to one aspect of the present application, a method for controlling temperature of urea solution is provided. The vehicle comprises a urea container for containing urea solution, an engine, a gas guide pipe, a first blocking valve and a fan. Two ends of the gas guide pipe are connected with an exhaust pipe of the engine respectively. A section of the gas guide pipe is located in a cavity of the urea container. The first blocking valve is arranged on the gas guide pipe and is used for controlling opening and closing of the gas guide pipe. The fan is located on one side of the urea container and is used for air cooling the urea solution in the urea container. The method comprises: obtaining a urea solution temperature, which is a current temperature of the urea solution in the urea container; in a case that the urea solution temperature is less than a thawing threshold, controlling the first blocking valve to open until the urea solution temperature is greater than or equal to the thawing threshold, so that exhaust gas of the engine heats the urea solution through the gas guide pipe. The thawing threshold is a minimum temperature meeting a urea solution injection requirement; in a case that the urea solution temperature is greater than a deterioration threshold, controlling the fan to open until the urea solution temperature is less than or equal to the deterioration threshold, so that the fan air cools the urea solution. The deterioration threshold is a maximum temperature of the urea solution which does not affect exhaust gas treatment.

[0006] Optionally, in the case that the urea solution temperature is less than the thawing threshold, controlling the first blocking valve to open until the urea solution temperature is greater than or equal to the thawing threshold comprises: in the case that the urea solution temperature is less than the thawing threshold, calculating a difference between the thawing threshold and the urea solution temperature to obtain a first temperature difference; calculating a heating heat according to the first temperature difference, the heating heat being a heat required for heating the urea solution to the thawing threshold; calculating a blocking valve opening degree according to a waste flow, a waste gas temperature, a set temperature rising time and the heating heat. The waste flow is a flow of waste gas of the gas guide pipe. The waste gas temperature is a temperature of the waste gas of the gas guide pipe. The set temperature rising time is a longest temperature rising time meeting the urea solution injection requirement; controlling the first blocking valve to open and adjusting the opening degree of the first blocking valve to the blocking valve opening degree until the urea solution temperature is greater than or equal to the thawing threshold.

[0007] Optionally, the block valve opening degree is calculated according to the waste flow, the exhaust gas temperature, the set temperature rising time and the heating heat, and the calculation includes: establishing a first mapping relationship according to historical records, the first mapping relationship being a mapping relationship of the waste flow, the exhaust gas temperature, the set temperature rising time, the heating heat and the block valve opening degree, and querying the block valve opening degree corresponding to the waste flow, the exhaust gas temperature, the set temperature rising time and the heating heat according to the first mapping relationship; or, a block valve opening degree calculation formula is established according to the historical records, and the waste flow, the exhaust gas temperature, the set temperature rising time and the heating heat are substituted into the block valve opening degree calculation formula to calculate the block valve opening degree, the block valve opening degree calculation formula being a relationship formula of the waste flow, the exhaust gas temperature, the set temperature rising time, the heating heat and the block valve opening degree.

[0008] Optionally, the vehicle further includes a cooling water pipeline and a second block valve, one end of the cooling water pipeline is connected with an outlet of cooling water of the engine, the other end of the cooling water pipeline is connected with a container of the cooling water of the engine, a section of the cooling water pipeline is located in the cavity of the urea container, the second block valve is arranged on the cooling water pipeline and is used to control the on-off of the cooling water pipeline, in the case that the urea solution temperature is less than the thawing threshold value, the first block valve is controlled to open until the urea solution temperature is greater than or equal to the thawing threshold value, and the method further includes: in the case that the urea solution temperature is less than the thawing threshold value and the first block valve has an opening failure, the first block valve is controlled to close and the second block valve is controlled to open until the urea solution temperature is greater than or equal to the thawing threshold value.

[0009] Optionally, the first block valve is controlled to open and the opening degree of the first block valve is adjusted to the block valve opening degree until the urea solution temperature is greater than or equal to the thawing threshold value, and the method includes: the first block valve is controlled to open and the opening degree of the first block valve is adjusted to the block valve opening degree; the flow of the exhaust gas of the gas guide pipe is monitored in real time to obtain an updated waste flow; and in the case that the difference between the waste flow and the updated waste flow is greater than a difference threshold value, the opening degree of the first block valve is increased.

[0010] Optionally, in the case that the urea solution temperature is less than the thawing threshold value, a first temperature difference is calculated, which is the difference between the thawing threshold value and the urea solution temperature, and the method includes: in the case that the urea solution temperature is less than the thawing threshold value, a thawing temperature greater than the thawing threshold value is calculated, and the first temperature difference is calculated, which is the difference between the thawing temperature and the urea solution temperature.

[0011] Optionally, in the case that the urea solution temperature is greater than the deterioration threshold, the controlling the fan to be turned on until the urea solution temperature is less than or equal to the deterioration threshold comprises: in the case that the urea solution temperature is greater than the deterioration threshold, calculating a second temperature difference between the urea solution temperature and the deterioration threshold; querying a first rotating speed corresponding to a set cooling time according to a second mapping relationship, the second mapping relationship being a mapping relationship among the second temperature difference, the set cooling time and the first rotating speed, the set cooling time being a longest cooling time meeting a requirement of the urea solution for exhaust treatment; querying a cooling coefficient corresponding to a third temperature difference according to a third mapping relationship, the third mapping relationship being a mapping relationship between the third temperature difference and the cooling coefficient, the third temperature difference being a difference between the urea solution temperature and an ambient temperature; calculating a product of the cooling coefficient and the first rotating speed to obtain a second rotating speed; and controlling the blocking valve to be closed and the fan to operate at the second rotating speed until the urea solution temperature is less than or equal to the deterioration threshold.

[0012] According to another aspect of the present application, a device for controlling a urea solution temperature is provided, a vehicle comprising a urea container, an engine, a gas guide pipe, a first blocking valve and a fan, the urea container being configured to hold a urea solution, two ends of the gas guide pipe being connected to an exhaust pipe of the engine respectively, a section of the gas guide pipe being located in a cavity of the urea container, the first blocking valve being arranged on the gas guide pipe and configured to control opening and closing of the gas guide pipe, the fan being located on a side of the urea container and configured to air cool the urea solution in the urea container, the device comprising: an acquisition unit configured to acquire a urea solution temperature, the urea solution temperature being a current temperature of the urea solution in the urea container; a first control unit configured to, in the case that the urea solution temperature is less than a thawing threshold, control the first blocking valve to be turned on until the urea solution temperature is greater than or equal to the thawing threshold, so that exhaust gas of the engine heats the urea solution through the gas guide pipe, the thawing threshold being a lowest temperature meeting a requirement of the urea solution for injection; and a second control unit configured to, in the case that the urea solution temperature is greater than a deterioration threshold, control the fan to be turned on until the urea solution temperature is less than or equal to the deterioration threshold, so that the fan air cools the urea solution, the deterioration threshold being a highest temperature of the urea solution not affecting exhaust treatment.

[0013] According to still another aspect of the present application, a computer readable storage medium is provided, the computer readable storage medium comprising a stored program, wherein the computer readable storage medium controls a device where the computer readable storage medium is located to perform any one of the methods when the program is executed.

[0014] According to another aspect of the present application, a vehicle is provided, comprising: a urea container, an engine, a gas guide pipe, a first blocking valve, a fan, one or more processors, a memory, and one or more programs, wherein the urea container is configured to hold a urea solution, two ends of the gas guide pipe are respectively connected to an exhaust pipe of the engine, a section of the gas guide pipe is located in a cavity of the urea container, the first blocking valve is arranged on the gas guide pipe and is configured to control the opening and closing of the gas guide pipe, the fan is located on one side of the urea container and is configured to air cool the urea solution of the urea container, the one or more programs are stored in the memory and configured to be executed by the one or more processors, and the one or more programs comprise any one of the methods.

[0015] According to the technical solution of the present application, in the above urea solution temperature control method, first, the urea solution temperature is obtained, which is the current temperature of the urea solution in the urea container; then, when the urea solution temperature is less than the thawing threshold, the first blocking valve is controlled to open until the urea solution temperature is greater than or equal to the thawing threshold, so that the exhaust gas of the engine heats the urea solution through the gas guide pipe, and the thawing threshold is the minimum temperature that meets the urea solution injection requirement; finally, when the urea solution temperature is greater than the deterioration threshold, the fan is controlled to open until the urea solution temperature is less than or equal to the deterioration threshold, so that the fan air cools the urea solution, and the deterioration threshold is the maximum temperature of the urea solution that does not affect the exhaust gas treatment. In the case where the urea solution temperature is less than the thawing threshold, the first blocking valve is controlled to open, so that the exhaust gas of the engine heats the urea solution through the gas guide pipe, realizing the thawing of the urea solution. Compared with the existing technology of using the cooling water of the engine for heating, the temperature of the exhaust gas is higher, and the thawing is faster. In the case where the urea solution temperature is greater than the deterioration threshold, the fan is controlled to open, so that the fan air cools the urea solution, avoiding the deterioration of the urea solution, thereby realizing the control of the urea solution temperature in a suitable range, ensuring the effect of the exhaust gas treatment, and solving the problem of poor exhaust gas treatment effect caused by the difficulty in controlling the temperature of the urea solution in the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 A hardware structure block diagram of a mobile terminal for executing a urea solution temperature control method according to an embodiment of the present application is shown;

[0017] Figure 2 A device connection diagram related to urea solution temperature control in a vehicle according to an embodiment of the present application is shown;

[0018] Figure 3A flow chart of a method for controlling temperature of a urea solution is shown according to an embodiment of the present application;

[0019] Figure 4 A flow chart of a method for thawing a urea solution is shown according to an embodiment of the present application;

[0020] Figure 5 A flow chart of another method for controlling temperature of a urea solution is shown according to an embodiment of the present application;

[0021] Figure 6 A structure block diagram of a device for controlling temperature of a urea solution is shown according to an embodiment of the present application.

[0022] Wherein, the above-mentioned drawings include the following reference signs:

[0023] 102, processor; 104, memory; 106, transmission device; 108, input and output device; 10, urea container; 20, air guide pipe; 21, air inlet; 22, air outlet; 30, first blocking valve; 40, fan; 50, dust cover; 60, cooling water pipeline. DETAILED DESCRIPTION

[0024] It should be noted that the embodiments and features of the embodiments in the present application can be combined with each other without conflict. The technical solutions in the embodiments of the present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0025] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should be within the scope of protection of the present application.

[0026] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, not necessarily to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not necessarily limit to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0027] As introduced in the background technology, it is difficult to control the temperature of the urea solution in the prior art, resulting in poor exhaust gas treatment effect. To solve this problem, the embodiments of the present application provide a method, device, computer-readable storage medium and vehicle for controlling the temperature of a urea solution.

[0028] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0029] The method embodiments provided in the embodiments of the present application can be executed in a mobile terminal, a computer terminal or a similar computing device. Taking running on a mobile terminal as an example, Figure 1 This is a hardware structure block diagram of a mobile terminal for a method for controlling the temperature of a urea solution according to an embodiment of the present invention. Figure 1 As shown, the mobile terminal may include one or more ( Figure 1 Only one is shown) a processor 102 (the processor 102 may include but is not limited to a microprocessor MCU or a programmable logic device FPGA and other processing devices) and a memory 104 for storing data, wherein the mobile terminal may also include a transmission device 106 and an input and output device 108 for communication functions. It will be understood by those skilled in the art that Figure 1 The structure shown is only for illustration and does not limit the structure of the mobile terminal. Figure 1 More or fewer components than shown, or with Figure 1 Different configurations shown.

[0030] The memory 104 can be used to store computer programs, such as software programs of application software and modules, such as a computer program corresponding to the display method of device information in the embodiments of the present application. The processor 102 executes various functional applications and data processing, i.e., implements the above method, by running the computer programs stored in the memory 104. The memory 104 can include a high-speed random access memory, and can further include a non-volatile memory, such as one or more magnetic storage devices, flash memories, or other non-volatile solid-state memories. In some examples, the memory 104 can further include memories remotely arranged with respect to the processor 102, which can be connected to the mobile terminal through a network. Examples of the above network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and a combination thereof. The transmission device 106 is used to receive or send data via a network. The specific examples of the above network can include a wireless network provided by a communication provider of the mobile terminal. In one example, the transmission device 106 includes a network adapter (NIC), which can be connected to other network devices through a base station so as to communicate with the Internet. In one example, the transmission device 106 can be a radio frequency (RF) module, which is used to communicate with the Internet in a wireless manner.

[0031] In the embodiments, a method for controlling temperature of urea solution running on a mobile terminal, a computer terminal or similar computing device is provided, as shown in Figure 2 The vehicle includes a urea container 10, an engine, a gas guide pipe 20, a first blocking valve 30 and a fan 40. The urea container 10 is used to hold urea solution. Two ends of the gas guide pipe 20 are respectively connected to exhaust pipes of the engine. A section of the gas guide pipe 20 is located in a cavity of the urea container 10. The first blocking valve 30 is arranged on the gas guide pipe and is used to control opening and closing of the gas guide pipe 20. The fan 40 is located on one side of the urea container 10 and is used to air cool the urea solution in the urea container 10. It should be noted that the steps shown in the flowchart can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0032] Figure 3 is a flowchart of the method for controlling temperature of urea solution according to the embodiments of the present application. As shown in Figure 3 The method includes the following steps:

[0033] In step S201, the temperature of urea solution is obtained. The temperature of urea solution is the current temperature of the urea solution in the urea container.

[0034] Specifically, the temperature of the urea solution is monitored in real time to ensure that the temperature of the urea solution is controlled within a proper range, and the urea solution can be supplied to the SCR processor at any time for exhaust treatment.

[0035] In step S202, when the temperature of the urea solution is less than a thawing threshold, the first blocking valve is controlled to open until the temperature of the urea solution is greater than or equal to the thawing threshold, so that the exhaust gas of the engine heats the urea solution through the gas guide pipe, and the thawing threshold is the minimum temperature that meets the urea solution injection requirement.

[0036] Specifically, when the temperature of the urea solution is less than the thawing threshold, it indicates that the urea solution is frozen and affects injection, as shown in FIG. 1, the first blocking valve 30 is controlled to open so that the exhaust gas of the engine enters the urea container 10 through the gas inlet 21 of the gas guide pipe 20, heats the urea solution, and is discharged through the gas outlet 22 of the gas guide pipe 20 until the temperature of the urea solution is greater than or equal to the thawing threshold, and thawing is completed. Figure 2

[0037] In step S203, when the temperature of the urea solution is greater than a deterioration threshold, the fan is controlled to open until the temperature of the urea solution is less than or equal to the deterioration threshold, so that the fan air-cools the urea solution, and the deterioration threshold is the maximum temperature of the urea solution that does not affect exhaust treatment.

[0038] Specifically, when the temperature of the urea solution is greater than the deterioration threshold, it indicates that the temperature of the urea solution is too high and may cause deterioration, as shown in FIG. 2, the fan 40 is controlled to open to air-cool the urea solution of the urea container 10 until the temperature of the urea solution is less than or equal to the deterioration threshold, so that the urea solution supplied to the SCR processor for exhaust treatment is not deteriorated, thereby ensuring the exhaust treatment effect, and in addition, the fan 40 is provided with a dust cover 50 away from one side of the urea container 10, to reduce the influence of particles in the air on the operation of the fan 40. The related circuit layout is determined according to the overall vehicle layout. Figure 2

[0039] ​​The method for controlling the temperature of the urea solution comprises the following steps: obtaining the temperature of the urea solution in the urea container; when the temperature of the urea solution is less than a thawing threshold, opening the first blocking valve until the temperature of the urea solution is greater than or equal to the thawing threshold, so that the exhaust gas of the engine heats the urea solution through the gas guide pipe, and the thawing threshold is the minimum temperature meeting the urea solution injection requirement; and when the temperature of the urea solution is greater than a deterioration threshold, opening the fan until the temperature of the urea solution is less than or equal to the deterioration threshold, so that the fan air-cools the urea solution, and the deterioration threshold is the maximum temperature of the urea solution that does not affect the exhaust gas treatment. When the temperature of the urea solution is less than the thawing threshold, the first blocking valve is opened to heat the urea solution through the gas guide pipe, so that the urea solution is thawed. Compared with the prior art, the exhaust gas has a higher temperature and is thawed faster. When the temperature of the urea solution is greater than the deterioration threshold, the fan is opened to air-cool the urea solution, so that the urea solution is prevented from deteriorating. Therefore, the temperature of the urea solution is controlled in an appropriate range, the effect of the exhaust gas treatment is ensured, and the problem that the temperature of the urea solution is difficult to control in the prior art, resulting in a poor exhaust gas treatment effect, is solved.

[0040] In order to realize rapid thawing, in an optional embodiment, as shown in FIG. 2, Figure 4 the step S202 comprises the following steps:

[0041] In step S2021, when the temperature of the urea solution is less than the thawing threshold, a first temperature difference between the thawing threshold and the temperature of the urea solution is calculated.

[0042] In step S2022, a heating heat required for heating the urea solution to the thawing threshold is calculated according to the first temperature difference.

[0043] In step S2023, a blocking valve opening degree is calculated according to the exhaust flow, the exhaust gas temperature, the set temperature rising time and the heating heat, the exhaust flow is the flow of the exhaust gas in the gas guide pipe, the exhaust gas temperature is the temperature of the exhaust gas in the gas guide pipe, and the set temperature rising time is the longest temperature rising time meeting the urea solution injection requirement.

[0044] In step S2024, the first blocking valve is opened and the opening degree of the first blocking valve is adjusted to the blocking valve opening degree until the temperature of the urea solution is greater than or equal to the thawing threshold.

[0045] In the above embodiment, in order to make the thawing effect of the exhaust gas heating more obvious, the heat required for heating the urea solution to the thawing threshold, i.e., the heating heat, is calculated according to the difference between the thawing threshold and the temperature of the urea solution, and then the exhaust gas flow rate and the exhaust gas temperature at the manifold are collected by the sensor, so as to calculate the opening degree of the blocking valve according to the exhaust gas flow rate, the exhaust gas temperature, the set heating time and the heating heat, and then control the opening degree of the blocking valve, so that the thawing is completed within the set heating time, the rapid thawing is realized, and the delay of the exhaust gas treatment is avoided.

[0046] In order to obtain an accurate opening degree of the blocking valve, in an optional embodiment, the step S2023 comprises:

[0047] In step S20231, a first mapping relationship is established according to the historical record, the first mapping relationship is a mapping relationship among the exhaust gas flow rate, the exhaust gas temperature, the set heating time, the heating heat and the opening degree of the blocking valve, and the opening degree of the blocking valve corresponding to the exhaust gas flow rate, the exhaust gas temperature, the set heating time and the heating heat is obtained by querying according to the first mapping relationship; or,

[0048] In step S20232, a blocking valve opening degree calculation formula is established according to the historical record, and the exhaust gas flow rate, the exhaust gas temperature, the set heating time and the heating heat are substituted into the blocking valve opening degree calculation formula to calculate the opening degree of the blocking valve, the blocking valve opening degree calculation formula is a relationship among the exhaust gas flow rate, the exhaust gas temperature, the set heating time, the heating heat and the opening degree of the blocking valve.

[0049] In the above embodiment, according to the temperature difference AT between the current temperature of the urea and the thawing temperature, the heat Q required for heating to the thawing temperature within a reasonable time is calculated, the exhaust gas flow rate V and the exhaust gas temperature T are obtained by the exhaust gas flow rate and temperature sensor, the opening degree K of the blocking valve can be calculated from the parameters Q=atKVT+b, wherein t is the set heating time, a is the set coefficient, and b is the correction parameter, and the opening degree K of the blocking valve is calculated by substituting the response data. Of course, the first mapping relationship, i.e., the mapping relationship among the exhaust gas flow rate, the exhaust gas temperature, the set heating time, the heating heat and the opening degree of the blocking valve, can be established by MAP calibration, and a MAP table can be generated, so that the opening degree of the blocking valve can be queried by the MAP table.

[0050] In order to further ensure the thawing, in an optional embodiment, as Figure 2As shown, the vehicle further comprises a cooling water pipe 60 and a second blocking valve, one end of the cooling water pipe 60 is connected with an outlet of cooling water of the engine, the other end of the cooling water pipe 60 is connected with a container of cooling water of the engine, a section of the cooling water pipe 60 is located in the cavity of the urea container 10, the second blocking valve is arranged on the cooling water pipe 60 and is used for controlling the on-off of the cooling water pipe 60, and the step S202 further comprises:

[0051] In the case that the urea solution temperature is less than the thawing threshold value and the first blocking valve has an opening failure, the first blocking valve is controlled to be closed and the second blocking valve is controlled to be opened until the urea solution temperature is greater than or equal to the thawing threshold value in step S2025.

[0052] In the embodiment, since the first blocking valve may fail to thaw by exhaust gas, the first blocking valve is controlled to be closed and the second blocking valve is controlled to be opened, and the backup cooling water pipe is used for heating, so that thawing is further ensured to be realized.

[0053] In order to further ensure rapid thawing, in an optional embodiment, the step S2024 comprises:

[0054] The first blocking valve is controlled to be opened and the opening degree of the first blocking valve is adjusted to the blocking valve opening degree in step S20241.

[0055] The flow of exhaust gas of the gas guide pipe is monitored in real time to obtain an updated exhaust flow in step S20242.

[0056] In the case that the difference between the exhaust flow and the updated exhaust flow is greater than a difference threshold value, the opening degree of the first blocking valve is increased in step S20243.

[0057] In the embodiment, in order to avoid that the flow changes during the heating process, the parameter of the blocking valve at the gas outlet is confirmed, when the exhaust flow monitoring is low, the valve opening degree is controlled, the high-temperature gas is stagnated in the designed urea manifold, the opening degree is increased before the pressure is higher than the influence on the reliability of the components, and the gas is released.

[0058] In order to ensure that the urea solution after thawing does not affect injection, in an optional embodiment, the step S2021 comprises:

[0059] In the case that the urea solution temperature is less than the thawing threshold value, a difference between a thawing temperature and the urea solution temperature is calculated to obtain the first temperature difference, and the thawing temperature is greater than the thawing threshold value in step S20211.

[0060] In the above embodiment, the temperature after thawing is appropriately increased so that the thawing temperature is greater than the thawing threshold, ensuring that the urea solution after thawing does not affect the injection, thereby not affecting the tail gas treatment.

[0061] In order to ensure that the urea solution after thawing does not affect the injection, in an alternative embodiment, the step S203 comprises:

[0062] In step S2031, in the case where the urea solution temperature is greater than the deterioration threshold, a second temperature difference is calculated as the difference between the urea solution temperature and the deterioration threshold;

[0063] In step S2032, a first speed corresponding to the second temperature difference and a set cooling time is queried according to a second mapping relationship, the second mapping relationship being a mapping relationship between the second temperature difference, the set cooling time and the first speed, and the set cooling time being the longest cooling time required to meet the demand of the urea solution for tail gas treatment;

[0064] In step S2033, a cooling coefficient corresponding to a third temperature difference is queried according to a third mapping relationship, the third mapping relationship being a mapping relationship between the third temperature difference and the cooling coefficient, and the third temperature difference being the difference between the urea solution temperature and the ambient temperature;

[0065] In step S2034, a second speed is calculated as the product of the cooling coefficient and the first speed;

[0066] In step S2035, the blocking valve is controlled to be closed and the fan is controlled to operate at the second speed until the urea solution temperature is less than or equal to the deterioration threshold.

[0067] In the above embodiment, in the case where the urea solution temperature is greater than the deterioration threshold, the first blocking valve needs to be in a fully closed state, i.e. the heating part is not effective, and the fan cooling scheme is speed MAP calibrated. The first speed Ns is determined by the temperature difference and the expected time, and the set temperature is less than the deterioration temperature. The urea temperature is cooled in advance, and this part is judged based on the ambient temperature. If the ambient temperature is lower than the deterioration threshold, this function is not effective. If the ambient temperature is higher than the deterioration threshold, the difference between the ambient temperature and the current urea temperature is calculated to determine the cooling coefficient c according to the second mapping relationship, so as to calculate the second speed Np = cNs, thereby realizing a more optimal control logic scheme.

[0068] In order to enable those skilled in the art to more clearly understand the technical solutions of the present application, the implementation process of the urea solution temperature control method of the present application will be described in detail below with reference to specific embodiments.

[0069] The present embodiment relates to a specific urea solution temperature control method, as shown in Figure 5As shown, comprising the following steps:

[0070] Step S1: The first electromagnetic valve controls the on-off of the gas taken from the exhaust pipe. Considering the reliability of the related device, the default state is closed. After the engine is running, the electromagnetic valve control gas circuit is turned on, and the high-temperature gas enters the urea heating pipeline (the urea heating pipeline should be a spiral structure and as close to the urea suction pipe as possible). Through heat transfer, it promotes the thawing of urea to speed up. After the temperature is appropriate, the blocking valve is closed to stop the gas flow. When the ambient temperature is high, the gas pipeline is still in the blocking state. At this time, the fan works, and the urea at the bottom of the urea tank is cooled by air flow. A dust cover is arranged at the lowermost position to reduce the influence of particles in the air on the operation of the fan. The layout of the related circuit is determined according to the overall vehicle arrangement;

[0071] Step S2: In order to make the thawing effect of the exhaust gas heating more obvious, the exhaust gas flow and exhaust gas temperature at the manifold can be collected by the sensor, and a certain logic calculation is performed on the urea tank temperature, and then the opening of the blocking valve is controlled. In order to achieve this purpose, flow and temperature sensors need to be installed at appropriate positions, and the urea temperature is collected from the original sensor. After the related input quantities can be normally monitored, according to the temperature difference AT of the current urea temperature and the thawing temperature, the heat Q required to heat to the thawing temperature within a reasonable time is calculated; the exhaust gas flow V and exhaust gas temperature T are obtained through the exhaust gas flow and temperature sensors, and the first blocking valve opening K can be calculated from the above parameters Q=atKVT+b, wherein t is the set heating time, a is the set coefficient, and b is the correction parameter. According to the above formula, the opening of the first blocking valve is derived, and is controlled through the valve structure. When a valve body failure is monitored, the valve body can be fully closed, and only the original water heating mode is retained to prevent overheating from affecting the quality of urea. Similarly, the exhaust port blocking valve can be parameter confirmed, and when the exhaust flow monitoring is low, the valve opening is controlled to make the high-temperature gas stagnate in the designed urea manifold, and the opening is increased when the pressure is higher than the reliability of the affected components to release the gas.

[0072] Step S3: For the cooling scheme under high temperature, the blocking valve needs to be fully closed, that is, the heating part is not effective, and the fan cooling scheme is speed MAP calibrated. The first speed Ns is determined by the temperature difference and the expected time. The set temperature is lower than the metamorphic temperature, and the urea temperature has been cooled in advance. This part is based on the environmental temperature to determine whether the function is effective. If the environmental temperature is lower than the metamorphic threshold, this function is not effective. If the environmental temperature is higher than the metamorphic threshold, the difference between the environmental temperature and the current urea temperature is calculated to determine the cooling coefficient c, and the second speed Np=cNs is calculated to realize a more optimal control logic scheme.

[0073] It is noted that the steps illustrated in the flowcharts of the figures can be executed by computer systems such as a group of computers executing computer-executable instructions, and that although the steps are presented in the order shown, the steps can be executed in a different order than those shown or described.

[0074] The embodiments of the present application further provide a device for controlling temperature of urea solution. It is to be noted that the device for controlling temperature of urea solution can be used to execute the method for controlling temperature of urea solution provided by the embodiments of the present application. The device is used to realize the above-mentioned embodiments and preferred embodiments, and will not be described in detail. As used below, the term "module" can be a combination of software and / or hardware that realizes a predetermined function. Although the device described in the following embodiments is preferably realized in software, realization in hardware or a combination of software and hardware is also possible and contemplated.

[0075] The device for controlling temperature of urea solution provided by the embodiments of the present application is described below.

[0076] Figure 6 is a structural block diagram of the device for controlling temperature of urea solution according to the embodiments of the present application. As shown in Figure 6 , the device comprises:

[0077] The acquisition unit 100 is configured to acquire the temperature of urea solution, which is the current temperature of the urea solution in the urea container.

[0078] Specifically, the temperature of urea solution is monitored in real time to ensure that the temperature of urea solution is within a suitable range, and the urea solution can be supplied to the SCR processor at any time for exhaust treatment.

[0079] The first control unit 200 is configured to, in the case that the temperature of urea solution is less than a thawing threshold value, control the first blocking valve to open until the temperature of urea solution is greater than or equal to the thawing threshold value, so that the exhaust gas of the engine passes through the gas guide pipe to heat the urea solution, and the thawing threshold value is the minimum temperature that meets the urea solution injection requirement.

[0080] Specifically, in the case that the temperature of urea solution is less than the thawing threshold value, it indicates that the urea solution is frozen and affects injection, as shown in Figure 2 , the first blocking valve 30 is controlled to open so that the exhaust gas of the engine enters the urea container 10 through the gas inlet 21 of the gas guide pipe 20, is heated by the urea solution, and is discharged through the gas outlet 22 of the gas guide pipe 20 until the temperature of urea solution is greater than or equal to the thawing threshold value, and thawing is completed.

[0081] The second control unit 300 is configured to control the fan to be turned on until the temperature of the urea solution is less than or equal to the deterioration threshold value when the temperature of the urea solution is greater than the deterioration threshold value, so that the fan performs air cooling on the urea solution, and the deterioration threshold value is the maximum temperature of the urea solution that does not affect the exhaust gas treatment.

[0082] Specifically, when the temperature of the urea solution is greater than the deterioration threshold value, it indicates that the high temperature of the urea solution may cause deterioration, such as Figure 2 As shown, the fan 40 is controlled to be turned on to perform air cooling on the urea solution of the urea container 10 until the temperature of the urea solution is less than or equal to the deterioration threshold value, so that the urea solution supplied to the SCR processor for exhaust gas treatment is not deteriorated, thereby ensuring the exhaust gas treatment effect, and the dust cover 50 is arranged on the side of the fan 40 away from the urea container 10 to reduce the influence of particles in the air on the operation of the fan 40. The related circuit layout is determined according to the overall vehicle layout.

[0083] In the control device for the temperature of the urea solution, the acquisition unit acquires the temperature of the urea solution, which is the current temperature of the urea solution in the urea container; the first control unit controls the first blocking valve to be turned on until the temperature of the urea solution is greater than or equal to the thawing threshold value when the temperature of the urea solution is less than the thawing threshold value, so that the exhaust gas of the engine heats the urea solution through the gas guide pipe, and the thawing threshold value is the minimum temperature that meets the urea solution injection requirement; the second control unit controls the fan to be turned on until the temperature of the urea solution is less than or equal to the deterioration threshold value when the temperature of the urea solution is greater than the deterioration threshold value, so that the fan performs air cooling on the urea solution, and the deterioration threshold value is the maximum temperature of the urea solution that does not affect the exhaust gas treatment. When the temperature of the urea solution is less than the thawing threshold value, the first control unit controls the first blocking valve to be turned on, so that the exhaust gas of the engine heats the urea solution through the gas guide pipe, thereby thawing the urea solution. Compared with the prior art of using the cooling water of the engine to heat, the temperature of the exhaust gas is higher, and the thawing is faster. When the temperature of the urea solution is greater than the deterioration threshold value, the second control unit controls the fan to be turned on, so that the fan performs air cooling on the urea solution, thereby avoiding the deterioration of the urea solution, and achieving the control of the temperature of the urea solution in a suitable range, ensuring the effect of the exhaust gas treatment, and solving the problem of poor exhaust gas treatment effect caused by the difficulty in controlling the temperature of the urea solution in the prior art.

[0084] In order to achieve rapid thawing, in an optional embodiment, as shown in Figure 4 The first control unit includes:

[0085] The first calculation module is configured to calculate a difference between the thawing threshold and the temperature of the urea solution to obtain a first temperature difference when the temperature of the urea solution is less than the thawing threshold.

[0086] The second calculation module is configured to calculate a heating heat according to the first temperature difference, the heating heat being a heat required for heating the urea solution to the thawing threshold.

[0087] The third calculation module is configured to calculate the opening of the blocking valve according to the exhaust flow, the exhaust temperature, the set temperature rising time and the heating heat, the exhaust flow being a flow of exhaust gas of the gas guide pipe, the exhaust temperature being a temperature of the exhaust gas of the gas guide pipe, and the set temperature rising time being a longest temperature rising time meeting a demand of the urea solution injection.

[0088] The first control module is configured to control the first blocking valve to be opened and the opening of the first blocking valve to be adjusted to the opening of the blocking valve until the temperature of the urea solution is greater than or equal to the thawing threshold.

[0089] In the embodiment, in order to make the thawing effect of the exhaust gas heating more obvious, the heat required for heating the urea solution to the thawing threshold, i.e., the heating heat, is calculated according to the difference between the thawing threshold and the temperature of the urea solution, the exhaust flow and the exhaust temperature at the manifold are collected by the sensor, the opening of the blocking valve is calculated according to the exhaust flow, the exhaust temperature, the set temperature rising time and the heating heat, and then the opening of the blocking valve is controlled, so that the thawing is completed within the set temperature rising time, the rapid thawing is realized, and the exhaust gas treatment is avoided to be delayed.

[0090] In order to obtain the accurate opening of the blocking valve, in an optional embodiment, the third calculation module comprises:

[0091] The query sub-module is configured to establish a first mapping relationship according to historical records, the first mapping relationship being a mapping relationship among the exhaust flow, the exhaust temperature, the set temperature rising time, the heating heat and the opening of the blocking valve, and the opening of the blocking valve corresponding to the exhaust flow, the exhaust temperature, the set temperature rising time and the heating heat is obtained according to the first mapping relationship; or,

[0092] The first calculation sub-module is configured to establish a calculation formula of the opening of the blocking valve according to the historical records, and substitute the exhaust flow, the exhaust temperature, the set temperature rising time and the heating heat into the calculation formula of the opening of the blocking valve to calculate the opening of the blocking valve, the calculation formula of the opening of the blocking valve being a relationship formula among the exhaust flow, the exhaust temperature, the set temperature rising time, the heating heat and the opening of the blocking valve.

[0093] In the above embodiment, according to the temperature difference ΔT of the current temperature of the urea and the thawing temperature, the heat Q required for heating to the thawing temperature within a reasonable time is calculated, the exhaust flow V and the exhaust temperature T are obtained through the exhaust flow and temperature sensors, and the opening K of the blocking valve can be converted from the above parameters, Q=atKVT+b, where t is the set heating time, a is the set coefficient, and b is the correction parameter. The opening K of the blocking valve can be calculated by substituting the response data. Of course, a first mapping relationship between the above exhaust flow, the above exhaust temperature, the above set heating time, the above heating heat, and the above opening of the blocking valve can be established through MAP calibration, and a MAP table can be generated. The opening of the blocking valve can be obtained by querying the MAP table.

[0094] In order to further ensure thawing, in an optional embodiment, as shown in Figure 2 the vehicle further comprises a cooling water pipeline 60 and a second blocking valve. One end of the cooling water pipeline 60 is connected to the outlet of the cooling water of the engine, the other end of the cooling water pipeline 60 is connected to the container of the cooling water of the engine, and a section of the cooling water pipeline 60 is located in the cavity of the urea container 10. The second blocking valve is arranged on the cooling water pipeline 60 and is used to control the opening and closing of the cooling water pipeline 60. The first control unit further comprises:

[0095] A second control module is configured to control the first blocking valve to be closed and control the second blocking valve to be opened when the temperature of the urea solution is less than the thawing threshold and the first blocking valve fails to open, until the temperature of the urea solution is greater than or equal to the thawing threshold.

[0096] In the above embodiment, since the first blocking valve may fail to thaw through the exhaust gas, the first blocking valve is controlled to be closed and the second blocking valve is controlled to be opened, and the backup cooling water pipeline is used for heating, thereby further ensuring thawing.

[0097] In order to further ensure rapid thawing, in an optional embodiment, the first control module comprises:

[0098] A first control submodule is configured to control the first blocking valve to be opened and adjust the opening of the first blocking valve to the opening of the blocking valve.

[0099] A monitoring submodule is configured to monitor the flow of the exhaust gas of the gas guide pipe in real time to obtain an updated exhaust flow.

[0100] A second control submodule is configured to increase the opening of the first blocking valve when the difference between the exhaust flow and the updated exhaust flow is greater than a difference threshold.

[0101] In the above embodiment, in order to avoid the change of flow rate leading to poor heating effect during the heating process, the parameter of the blocking valve at the gas outlet is confirmed, and when the exhaust flow rate monitoring is low, the valve opening degree is controlled, so that the high-temperature gas is stagnated in the designed urea manifold, and before the pressure is higher than the reliability of the affected components, the opening degree is increased to release the gas.

[0102] In order to ensure that the urea solution after thawing does not affect injection, in an optional embodiment, the first calculation module comprises:

[0103] The second calculation submodule is configured to calculate a difference between a thawing temperature and the urea solution temperature to obtain a first temperature difference when the urea solution temperature is less than the thawing threshold, and the thawing temperature is greater than the thawing threshold.

[0104] In the above embodiment, the temperature after thawing is appropriately increased, so that the thawing temperature is greater than the thawing threshold, and it is ensured that the urea solution after thawing does not affect injection, so as to not affect the exhaust gas treatment.

[0105] In order to ensure that the urea solution after thawing does not affect injection, in an optional embodiment, the second control unit comprises:

[0106] The fourth calculation module is configured to calculate a difference between the urea solution temperature and the deterioration threshold to obtain a second temperature difference when the urea solution temperature is greater than the deterioration threshold.

[0107] The first query module is configured to query a first rotating speed corresponding to the second temperature difference and a set cooling time according to a second mapping relationship, the second mapping relationship is a mapping relationship among the second temperature difference, the set cooling time and the first rotating speed, and the set cooling time is a longest cooling time required by the urea solution to meet the exhaust gas treatment.

[0108] The second query module is configured to query a cooling coefficient corresponding to a third temperature difference according to a third mapping relationship, the third mapping relationship is a mapping relationship between the third temperature difference and the cooling coefficient, and the third temperature difference is a difference between the urea solution temperature and an ambient temperature.

[0109] The fifth calculation module is configured to calculate a product of the cooling coefficient and the first rotating speed to obtain a second rotating speed.

[0110] The third control module is configured to control the blocking valve to be closed and control the fan to operate at the second rotating speed until the urea solution temperature is less than or equal to the deterioration threshold.

[0111] In the above embodiment, in the case where the urea solution temperature is greater than the metamorphic threshold value, the first blocking valve needs to be in a full-closed state, that is, the heating part is not effective, and the fan cooling scheme is subjected to speed MAP calibration, the first speed Ns is determined through the temperature difference and the expected time, and the set temperature is less than the metamorphic temperature, the urea temperature is cooled in advance, this part is judged based on the ambient temperature, if the ambient temperature is lower than the metamorphic threshold value, this function is not effective, if the ambient temperature is higher than the metamorphic threshold value, the difference between the ambient temperature and the current urea temperature is calculated to determine the cooling coefficient c through the second mapping relationship, so as to calculate the second speed Np=cNs, and a more optimal control logic scheme is realized.

[0112] The urea solution temperature control device includes a processor and a memory, and the above-mentioned acquisition unit, first control unit and second control unit are all stored in the memory as program units, and the corresponding functions are realized by the processor executing the above-mentioned program units stored in the memory. The above-mentioned modules are all located in the same processor; or, the above-mentioned modules are respectively located in different processors in any combination.

[0113] The processor contains a core, and the corresponding program unit is called from the memory by the core. The core can be set to one or more, and the problem that the temperature of the urea solution is difficult to control in the prior art, resulting in poor tail gas treatment effect, can be solved by adjusting the core parameters.

[0114] The memory can include a non-permanent memory in a computer readable medium, a random access memory (RAM) and / or a non-volatile memory such as a read-only memory (ROM) or a flash memory (flash RAM), and the memory includes at least one memory chip.

[0115] The embodiment of the present application provides a computer readable storage medium, and the computer readable storage medium includes a stored program, wherein when the program runs, the device where the computer readable storage medium is located executes the urea solution temperature control method.

[0116] Specifically, the urea solution temperature control method includes:

[0117] In step S201, the urea solution temperature is acquired, and the urea solution temperature is the current temperature of the urea solution in the urea container;

[0118] Specifically, the urea solution temperature is monitored in real time, so that the urea solution temperature is ensured to be in a suitable range, and the urea solution can be supplied to the SCR processor at any time for tail gas treatment.

[0119] Step S202, in the case that the urea solution temperature is less than the thawing threshold, the first blocking valve is controlled to open until the urea solution temperature is greater than or equal to the thawing threshold, so that the exhaust gas of the engine heats the urea solution through the gas guide pipe, and the thawing threshold is the minimum temperature meeting the urea solution injection requirement.

[0120] Specifically, in the case that the urea solution temperature is less than the thawing threshold, it indicates that the urea solution freezing affects the injection, for example, the urea solution is frozen and cannot be injected. Figure 2 As shown, the first blocking valve 30 is controlled to open so that the exhaust gas of the engine enters the urea container 10 through the gas inlet 21 of the gas guide pipe 20, heats the urea solution, and is discharged through the gas outlet 22 of the gas guide pipe 20 until the urea solution temperature is greater than or equal to the thawing threshold, and the thawing is completed.

[0121] Step S203, in the case that the urea solution temperature is greater than the deterioration threshold, the fan is controlled to open until the urea solution temperature is less than or equal to the deterioration threshold, so that the fan air-cools the urea solution, and the deterioration threshold is the maximum temperature of the urea solution that does not affect the exhaust treatment.

[0122] Specifically, in the case that the urea solution temperature is greater than the deterioration threshold, it indicates that the urea solution temperature is too high and may cause deterioration, for example, the urea solution is overheated and deteriorated. Figure 2 As shown, the fan 40 is controlled to open to air-cool the urea solution of the urea container 10 until the urea solution temperature is less than or equal to the deterioration threshold, so as to ensure that the urea solution supplied to the SCR processor for exhaust treatment is not deteriorated, thereby ensuring the exhaust treatment effect, and in addition, the dust cover 50 is arranged away from the side of the urea container 10, thereby reducing the influence of particles in the air on the operation of the fan 40. The related circuit layout is determined according to the vehicle arrangement.

[0123] The embodiment of the present application provides a processor for running a program, wherein the processor executes the control method of the urea solution temperature when the program runs.

[0124] Specifically, the control method of the urea solution temperature comprises:

[0125] Step S201, obtaining the urea solution temperature, the urea solution temperature being the current temperature of the urea solution in the urea container;

[0126] Specifically, the urea solution temperature is monitored in real time, so as to ensure that the urea solution temperature is controlled in a suitable range, and the urea solution can be supplied to the SCR processor for exhaust treatment at any time.

[0127] Step S202, in the case that the temperature of the urea solution is less than the thawing threshold, the first blocking valve is controlled to open until the temperature of the urea solution is greater than or equal to the thawing threshold, so that the exhaust gas of the engine heats the urea solution through the gas guide pipe, and the thawing threshold is the minimum temperature meeting the urea solution injection requirement.

[0128] Specifically, in the case that the temperature of the urea solution is less than the thawing threshold, it indicates that the urea solution freezing affects the injection, for example, as shown in FIG. 2, the first blocking valve 30 is controlled to open so that the exhaust gas of the engine enters the urea container 10 through the gas inlet 21 of the gas guide pipe 20, heats the urea solution, and is discharged through the gas outlet 22 of the gas guide pipe 20 until the temperature of the urea solution is greater than or equal to the thawing threshold, and the thawing is completed. Figure 2

[0129] Step S203, in the case that the temperature of the urea solution is greater than the deterioration threshold, the fan is controlled to open until the temperature of the urea solution is less than or equal to the deterioration threshold, so that the fan air-cools the urea solution, and the deterioration threshold is the maximum temperature of the urea solution that does not affect the exhaust treatment.

[0130] Specifically, in the case that the temperature of the urea solution is greater than the deterioration threshold, it indicates that the urea solution temperature is too high and may cause deterioration, for example, as shown in FIG. 3, the fan 40 is controlled to open to air-cool the urea solution of the urea container 10 until the temperature of the urea solution is less than or equal to the deterioration threshold, so as to ensure that the urea solution supplied to the SCR processor for exhaust treatment is not deteriorated, thereby ensuring the exhaust treatment effect, and in addition, the fan 40 is provided with a dust cover 50 away from one side of the urea container 10, so as to reduce the influence of particles in the air on the operation of the fan 40. The related circuit layout is determined according to the vehicle arrangement. Figure 2

[0131] The embodiment of the present application provides a vehicle, which comprises a urea container, an engine, a gas guide pipe, a first blocking valve, a fan, one or more processors, a memory and one or more programs, wherein the urea container is used for containing a urea solution, two ends of the gas guide pipe are connected with exhaust pipes of the engine respectively, a section of the gas guide pipe is located in a cavity of the urea container, the first blocking valve is arranged on the gas guide pipe and is used for controlling the opening and closing of the gas guide pipe, the fan is located on one side of the urea container and is used for air-cooling the urea solution of the urea container, the one or more programs are stored in the memory and are configured to be executed by the one or more processors, and the one or more programs comprise a program used for executing the method.

[0132] ​​Step S201, obtaining the urea solution temperature, the urea solution temperature being the current temperature of the urea solution in the urea container;

[0133] Specifically, the urea solution temperature is monitored in real time to ensure that the urea solution temperature is controlled within a proper range, so that the urea solution can be supplied to the SCR processor for tail gas treatment at any time.

[0134] Step S202, in the case that the urea solution temperature is less than a thawing threshold, controlling the first blocking valve to open until the urea solution temperature is greater than or equal to the thawing threshold, so that the exhaust gas of the engine passes through the gas guide pipe to heat the urea solution, the thawing threshold being the minimum temperature meeting the urea solution injection requirement;

[0135] Specifically, in the case that the urea solution temperature is less than the thawing threshold, it indicates that the urea solution is frozen, which affects the injection. Figure 2 As shown in FIG. 2, the first blocking valve 30 is controlled to open so that the exhaust gas of the engine enters the urea container 10 through the gas inlet 21 of the gas guide pipe 20, heats the urea solution, and is discharged through the gas outlet 22 of the gas guide pipe 20 until the urea solution temperature is greater than or equal to the thawing threshold, and the thawing is completed.

[0136] Step S203, in the case that the urea solution temperature is greater than a deterioration threshold, controlling the fan to open until the urea solution temperature is less than or equal to the deterioration threshold, so that the fan air-cools the urea solution, the deterioration threshold being the maximum temperature of the urea solution that does not affect the tail gas treatment.

[0137] Specifically, in the case that the urea solution temperature is greater than the deterioration threshold, it indicates that the urea solution temperature is too high, which may cause deterioration. Figure 2 As shown in FIG. 3, the fan 40 is controlled to open to air-cool the urea solution of the urea container 10 until the urea solution temperature is less than or equal to the deterioration threshold, so that the urea solution supplied to the SCR processor for tail gas treatment is not deteriorated, thereby ensuring the tail gas treatment effect. In addition, the dust cover 50 is arranged on the side of the fan 40 away from the urea container 10 to reduce the influence of particles in the air on the operation of the fan 40. The related circuit layout is determined according to the overall vehicle layout.

[0138] The application also provides a computer program product adapted to execute a program having at least the following method steps when executed on a data processing device:

[0139] Step S201, obtaining the urea solution temperature, the urea solution temperature being the current temperature of the urea solution in the urea container;

[0140] Specifically, the temperature of the urea solution is monitored in real time to ensure that the temperature of the urea solution is controlled within a proper range, and the urea solution can be supplied to the SCR processor at any time for exhaust treatment.

[0141] In step S202, when the temperature of the urea solution is less than a thawing threshold, the first blocking valve is controlled to be opened until the temperature of the urea solution is greater than or equal to the thawing threshold, so that the exhaust gas of the engine heats the urea solution through the gas guide pipe, and the thawing threshold is the minimum temperature that meets the urea solution injection requirement.

[0142] Specifically, when the temperature of the urea solution is less than the thawing threshold, it indicates that the freezing of the urea solution affects the injection, and the first blocking valve is controlled to be opened to allow the exhaust gas of the engine to enter the urea container through the gas inlet of the gas guide pipe, heat the urea solution, and then be discharged through the gas outlet of the gas guide pipe until the temperature of the urea solution is greater than or equal to the thawing threshold, and the thawing is completed. Figure 2 As shown in the figure, the first blocking valve 30 is controlled to be opened to allow the exhaust gas of the engine to enter the urea container 10 through the gas inlet 21 of the gas guide pipe 20, heat the urea solution, and then be discharged through the gas outlet 22 of the gas guide pipe 20 until the temperature of the urea solution is greater than or equal to the thawing threshold, and the thawing is completed.

[0143] In step S203, when the temperature of the urea solution is greater than a deterioration threshold, the fan is controlled to be opened until the temperature of the urea solution is less than or equal to the deterioration threshold, so that the fan cools the urea solution, and the deterioration threshold is the maximum temperature of the urea solution that does not affect the exhaust treatment.

[0144] Specifically, when the temperature of the urea solution is greater than the deterioration threshold, it indicates that the temperature of the urea solution is too high and may cause deterioration, and the fan is controlled to be opened to cool the urea solution of the urea container until the temperature of the urea solution is less than or equal to the deterioration threshold. Figure 2 As shown in the figure, the fan 40 is controlled to be opened to cool the urea solution of the urea container 10 until the temperature of the urea solution is less than or equal to the deterioration threshold, so that the urea solution supplied to the SCR processor for exhaust treatment is not deteriorated, thereby ensuring the exhaust treatment effect, and the fan 40 is provided with a dust cover 50 away from one side of the urea container 10 to reduce the influence of particles in the air on the operation of the fan 40. The related circuit layout is determined according to the overall vehicle layout.

[0145] It should be apparent to those skilled in the art that the modules or steps of the application described above can be implemented with a general purpose computer, and can be centralized in a single computer or distributed among a network of computers, and can be implemented with program code executable by a computer, and thus can be stored in a storage device and executed by a computer, and in some cases, the steps shown or described can be executed in a different order than shown or described, or can be implemented as separate integrated circuit modules or as a single integrated circuit module, and thus the application is not limited to any particular combination of hardware and software.

[0146] Those skilled in the art will appreciate that embodiments of the application can be devised for a method, a system, or a computer program product. Accordingly, the application can be embodied in the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the application can be in the form of a computer program product on one or more computer-usable storage media (including, but not limited to, disk memory, CD-ROMs, optical storage media, etc.) embodying computer readable program code.

[0147] The present application is described in reference to the flowchart illustrations and / or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in the flowchart illustrations and / or block diagrams.

[0148] These computer program instructions can also be stored in a computer- readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instructions which implement the functions specified in the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in the flowchart illustrations and / or block diagrams.

[0149] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart illustrations and / or block diagrams.Figure 1 one or more processes and / or functions specified in one or more blocks Figure 1 Figure 1 one or more processes and / or functions specified in one or more blocks

[0150] In one typical arrangement, the computing device includes one or more processors (CPUs), input / output interfaces, network interfaces, and memory.

[0151] The memory can include non-persistent memory and / or volatile memory, such as random access memory (RAM) and / or cache memory, non-volatile memory, such as read-only memory (ROM), EPROM, and / or flash memory, etc. The memory is an example of computer readable media.

[0152] Computer readable media includes permanent and non-permanent, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disc read-only memory (CD-ROM), digital versatile disc (DVD), or other optical storage, magnetic cassette, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information accessible to a computing device. According to the definition herein, computer readable media does not include transitory media, such as modulated data signals and carrier waves.

[0153] It should also be noted that the terms "comprising", "containing", or any other variant thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article or apparatus that comprises a list of elements does not only include those elements, but can also include other elements not expressly listed or inherent to such process, method, article or apparatus. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of additional identical elements in the process, method, article or apparatus that includes the element.

[0154] From the above description, it can be seen that the above-mentioned embodiments of the present application achieve the following technical effects:

[0155] 1) In the urea solution temperature control method of the present application, first, the urea solution temperature is obtained, which is the current temperature of the urea solution in the urea container; then, if the urea solution temperature is less than the thawing threshold, the first blocking valve is controlled to open until the urea solution temperature is greater than or equal to the thawing threshold, so that the exhaust gas of the engine heats the urea solution through the gas guide pipe, and the thawing threshold is the minimum temperature that meets the urea solution injection requirement; finally, if the urea solution temperature is greater than the deterioration threshold, the fan is controlled to open until the urea solution temperature is less than or equal to the deterioration threshold, so that the fan air-cools the urea solution, and the deterioration threshold is the maximum temperature of the urea solution that does not affect the exhaust gas treatment. This method controls the first blocking valve to open when the urea solution temperature is less than the thawing threshold, so that the exhaust gas of the engine heats the urea solution through the gas guide pipe, realizing the thawing of the urea solution. Compared with the prior art of using the cooling water of the engine to heat, the temperature of the exhaust gas is higher, and the thawing is faster. When the urea solution temperature is greater than the deterioration threshold, the fan is controlled to open, so that the fan air-cools the urea solution, avoiding the deterioration of the urea solution, thereby realizing the control of the urea solution temperature in the appropriate range, ensuring the effect of the exhaust gas treatment, and solving the problem of poor exhaust gas treatment effect caused by the difficulty in controlling the temperature of the urea solution in the prior art.

[0156] 2) In the urea solution temperature control device of the application, the acquisition unit acquires the urea solution temperature, which is the current temperature of the urea solution in the urea container; the first control unit controls the first blocking valve to open until the urea solution temperature is greater than or equal to the thawing threshold value, so that the exhaust gas of the engine heats the urea solution through the gas guide pipe, when the urea solution temperature is less than the thawing threshold value, which is the minimum temperature that meets the urea solution injection requirement; the second control unit controls the fan to open until the urea solution temperature is less than or equal to the deterioration threshold value, so that the fan air-cools the urea solution, when the urea solution temperature is greater than the deterioration threshold value, which is the maximum temperature of the urea solution that does not affect the exhaust gas treatment. When the urea solution temperature is less than the thawing threshold value, the device controls the first blocking valve to open, so that the exhaust gas of the engine heats the urea solution through the gas guide pipe, realizing the thawing of the urea solution. Compared with the prior art using the cooling water of the engine to heat, the temperature of the exhaust gas is higher, and the thawing is faster. When the urea solution temperature is greater than the deterioration threshold value, the fan is controlled to open, so that the fan air-cools the urea solution, avoiding the deterioration of the urea solution, thereby realizing the control of the urea solution temperature in the appropriate range, ensuring the effect of the exhaust gas treatment, and solving the problem of poor exhaust gas treatment effect caused by the difficulty in controlling the temperature of the urea solution in the prior art.

[0157] The above only describes the preferred embodiments of the application and is not intended to limit the application. Those skilled in the art can make various modifications and changes to the application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the application shall be included in the protection scope of the application.

Claims

1. A method of controlling the temperature of a urea solution, characterized by, The vehicle comprises a urea container for containing urea solution, an engine, a gas guide pipe, a first blocking valve and a fan, two ends of the gas guide pipe are connected with exhaust pipes of the engine respectively, a section of the gas guide pipe is located in a cavity of the urea container, the first blocking valve is arranged on the gas guide pipe and is used for controlling opening and closing of the gas guide pipe, and the fan is located on one side of the urea container and is used for air cooling of the urea solution in the urea container, and the method comprises the following steps of: obtaining a urea solution temperature, the urea solution temperature being a current temperature of the urea solution in the urea container; in a case that the urea solution temperature is less than a thawing threshold value, controlling the first blocking valve to open until the urea solution temperature is greater than or equal to the thawing threshold value, so that exhaust gas of the engine heats the urea solution through the gas guide pipe, and the thawing threshold value is a minimum temperature meeting injection requirements of the urea solution; in a case that the urea solution temperature is greater than a deterioration threshold value, controlling the fan to open until the urea solution temperature is less than or equal to the deterioration threshold value, so that the fan air cools the urea solution, and the deterioration threshold value is a maximum temperature of the urea solution not affecting exhaust gas treatment; the vehicle further comprises a cooling water pipe and a second blocking valve, one end of the cooling water pipe is connected with an outlet of cooling water of the engine, the other end of the cooling water pipe is connected with a container of the cooling water of the engine, a section of the cooling water pipe is located in the cavity of the urea container, the second blocking valve is arranged on the cooling water pipe and is used for controlling opening and closing of the cooling water pipe, in a case that the urea solution temperature is less than the thawing threshold value, the first blocking valve is controlled to open until the urea solution temperature is greater than or equal to the thawing threshold value, and the method further comprises the following steps of: in a case that the urea solution temperature is less than the thawing threshold value and the first blocking valve has an opening failure, the first blocking valve is controlled to close and the second blocking valve is controlled to open until the urea solution temperature is greater than or equal to the thawing threshold value.

2. The method of claim 1, wherein, in a case that the urea solution temperature is less than the thawing threshold value, controlling the first blocking valve to open until the urea solution temperature is greater than or equal to the thawing threshold value, comprising the following steps of: in a case that the urea solution temperature is less than the thawing threshold value, calculating a difference between the thawing threshold value and the urea solution temperature to obtain a first temperature difference; calculating a heating heat according to the first temperature difference, the heating heat being heat required for heating the urea solution to the thawing threshold value; calculating a blocking valve opening degree according to a waste flow, a waste gas temperature, a set temperature rising time and the heating heat, the waste flow being a flow of waste gas of the gas guide pipe, the waste gas temperature being a temperature of the waste gas of the gas guide pipe, and the set temperature rising time being a longest temperature rising time meeting injection requirements of the urea solution; controlling the first blocking valve to open and adjusting the first blocking valve opening degree to the blocking valve opening degree until the urea solution temperature is greater than or equal to the thawing threshold value.

3. The method of claim 2, wherein, The block valve opening degree is calculated according to the waste flow, the exhaust gas temperature, the set temperature rising time and the heating heat, and the calculation includes: A first mapping relationship is established according to historical records, and the first mapping relationship is a mapping relationship among the waste flow, the exhaust gas temperature, the set temperature rising time, the heating heat and the block valve opening degree; and the block valve opening degree corresponding to the waste flow, the exhaust gas temperature, the set temperature rising time and the heating heat is queried according to the first mapping relationship. Alternatively, a block valve opening degree calculation formula is established according to the historical records, and the waste flow, the exhaust gas temperature, the set temperature rising time and the heating heat are substituted into the block valve opening degree calculation formula to calculate the block valve opening degree, and the block valve opening degree calculation formula is a relationship formula among the waste flow, the exhaust gas temperature, the set temperature rising time, the heating heat and the block valve opening degree.

4. The method of claim 2, wherein, The first block valve is controlled to be opened and the opening degree of the first block valve is adjusted to the block valve opening degree until the urea solution temperature is greater than or equal to the thawing threshold, and the control includes: The first block valve is controlled to be opened and the opening degree of the first block valve is adjusted to the block valve opening degree. The waste flow of the exhaust gas of the gas guide pipe is monitored in real time to obtain an updated waste flow. In a case where a difference between the waste flow and the updated waste flow is greater than a difference threshold, the opening degree of the first block valve is increased.

5. The method of claim 2, wherein, In a case where the urea solution temperature is less than the thawing threshold, a first temperature difference is calculated, and the first temperature difference is a difference between the thawing threshold and the urea solution temperature. In a case where the urea solution temperature is less than the thawing threshold, a thawing temperature is greater than the thawing threshold, and a first temperature difference is calculated, and the first temperature difference is a difference between the thawing temperature and the urea solution temperature.

6. The method according to any one of claims 1 to 5, characterized in that, In a case where the urea solution temperature is greater than a deterioration threshold, the fan is controlled to be opened until the urea solution temperature is less than or equal to the deterioration threshold, and the control includes: In a case where the urea solution temperature is greater than the deterioration threshold, a second temperature difference is calculated, and the second temperature difference is a difference between the urea solution temperature and the deterioration threshold. A first rotating speed corresponding to the second temperature difference and a set temperature falling time is queried according to a second mapping relationship, the second mapping relationship is a mapping relationship among the second temperature difference, the set temperature falling time and the first rotating speed, and the set temperature falling time is a longest temperature falling time that meets a urea solution demand of exhaust gas treatment. A third temperature difference corresponding to a temperature falling coefficient is queried according to a third mapping relationship, the third mapping relationship is a mapping relationship between the third temperature difference and the temperature falling coefficient, and the third temperature difference is a difference between the urea solution temperature and an ambient temperature. A second rotating speed is calculated, and the second rotating speed is a product of the temperature falling coefficient and the first rotating speed. The block valve is controlled to be closed and the fan is controlled to operate at the second rotating speed until the urea solution temperature is less than or equal to the deterioration threshold.

7. A device for controlling the temperature of a urea solution, characterized in that The vehicle includes a urea container, an engine, a gas guide pipe, a first blocking valve and a fan, the urea container is used to hold urea solution, two ends of the gas guide pipe are connected with exhaust pipes of the engine respectively, a section of the gas guide pipe is located in a cavity of the urea container, the first blocking valve is arranged on the gas guide pipe and is used to control on-off of the gas guide pipe, the fan is located on one side of the urea container and is used to air cool the urea solution of the urea container, and the device includes: An acquisition unit is configured to acquire a urea solution temperature, the urea solution temperature being a current temperature of the urea solution in the urea container; A first control unit is configured to, in a case where the urea solution temperature is less than a thawing threshold, control the first blocking valve to open until the urea solution temperature is greater than or equal to the thawing threshold, so that exhaust gas of the engine heats the urea solution through the gas guide pipe, and the thawing threshold is a minimum temperature meeting an injection requirement of the urea solution; A second control unit is configured to, in a case where the urea solution temperature is greater than a deterioration threshold, control the fan to open until the urea solution temperature is less than or equal to the deterioration threshold, so that the fan air cools the urea solution, and the deterioration threshold is a maximum temperature of the urea solution not affecting exhaust gas treatment; The vehicle further includes a cooling water pipe and a second blocking valve, one end of the cooling water pipe is connected with an outlet of cooling water of the engine, the other end of the cooling water pipe is connected with a container of the cooling water of the engine, a section of the cooling water pipe is located in the cavity of the urea container, the second blocking valve is arranged on the cooling water pipe and is used to control on-off of the cooling water pipe, and the first control unit further includes a second control module configured to, in a case where the urea solution temperature is less than the thawing threshold and the first blocking valve has an opening failure, control the first blocking valve to close and control the second blocking valve to open until the urea solution temperature is greater than or equal to the thawing threshold.

8. A computer-readable storage medium, characterized in that, The computer readable storage medium includes a stored program, wherein the program, when executed, controls a device in which the computer readable storage medium is located to perform the method of any one of claims 1 to 6.

9. A vehicle characterized by comprising: The vehicle includes a urea container, an engine, a gas guide pipe, a first blocking valve, a fan, one or more processors, a memory, and one or more programs, the urea container is used to hold urea solution, two ends of the gas guide pipe are connected with exhaust pipes of the engine respectively, a section of the gas guide pipe is located in a cavity of the urea container, the first blocking valve is arranged on the gas guide pipe and is used to control on-off of the gas guide pipe, the fan is located on one side of the urea container and is used to air cool the urea solution of the urea container, the one or more programs are stored in the memory and are configured to be executed by the one or more processors, and the one or more programs include a program for performing the method of any one of claims 1 to 6. ​

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