Urea conveying pipeline heating method and device, controller and vehicle

Abstract

The invention is suitable for the technical field of vehicles, and provides a urea conveying pipeline heating method and device, a controller and a vehicle. Wherein a urea conveying pipeline of the vehicle is divided into at least two sections, and each section of the urea conveying pipeline is provided with independent heating equipment. The method comprises the following steps: acquiring operation parameters and environment temperature of a vehicle; according to the operation parameters and the environment temperature, whether heating equipment of each section of urea conveying pipeline needs to be started or not is judged, and the heating power of the heating equipment needing to be started is determined; according to the heating power, heating equipment needing to be started is controlled to be started for operation. The urea conveying pipeline can be heated more reasonably.

Description

Technical Field

[0001] The present invention belongs to the technical field of vehicles, and in particular relates to a urea delivery pipeline heating method, device, controller and vehicle. Background Art

[0002] With the continuous development of society, the requirements for vehicle exhaust emissions are getting higher and higher. In order to meet the exhaust emission requirements, vehicles are generally equipped with a urea system to neutralize nitrogen oxides in the exhaust gas.

[0003] The urea system transports urea through the urea delivery pipeline. Since the freezing point of urea solution is -11°C, in order to ensure the supply of urea solution, the urea delivery pipeline has a heating structure to prevent the urea in the pipeline from freezing. In related technologies, urea delivery pipelines are mostly heated evenly using heating wires. However, the uniform heating method is prone to insufficient heating of some pipe sections or overheating of some pipe sections. Summary of the invention

[0004] In view of this, embodiments of the present invention provide a urea delivery pipeline heating method, device, controller and vehicle to heat the urea delivery pipeline more reasonably.

[0005] A first aspect of an embodiment of the present invention provides a urea delivery pipeline heating method, wherein a urea delivery pipeline of a vehicle is divided into at least two sections, and each section of the urea delivery pipeline is provided with an independent heating device;

[0006] The method includes:

[0007] Obtain vehicle operating parameters and ambient temperature;

[0008] According to the operating parameters and ambient temperature, determine whether the heating equipment of each section of the urea delivery pipeline needs to be turned on, and determine the heating power of the heating equipment that needs to be turned on;

[0009] According to the heating power, the heating equipment that needs to be turned on is controlled to start running.

[0010] In combination with the first aspect, in a possible implementation of the first aspect, the at least two sections include a nozzle section, and the operating parameter includes exhaust gas temperature;

[0011] According to the operating parameters and ambient temperature, determine whether the heating equipment of each section of the urea delivery pipeline needs to be turned on, including:

[0012] If the ambient temperature is lower than a preset first temperature threshold, and the exhaust temperature is lower than a preset exhaust temperature threshold, it is determined that the heating device of the nozzle segment needs to be turned on;

[0013] Otherwise, it is determined that the heating device of the nozzle segment does not need to be turned on.

[0014] In combination with the first aspect, in a possible implementation of the first aspect, the at least two sections further include a pipe body section and a pump end interface section;

[0015] According to the operating parameters and ambient temperature, it is determined whether the heating equipment of each section of the urea delivery pipeline needs to be turned on, including:

[0016] If the ambient temperature is lower than a preset second temperature threshold, it is determined that the heating devices of the pipe body section and the pump end interface section need to be turned on;

[0017] If the ambient temperature is greater than or equal to the second temperature threshold, it is determined that the heating devices of the pipe body section and the pump end interface section do not need to be turned on;

[0018] The second temperature threshold is greater than the first temperature threshold.

[0019] In combination with the first aspect, in a possible implementation of the first aspect, the operating parameter further includes a vehicle speed, and the heating devices of the pipe body section and the pump end interface section are preset with respective corresponding first power values ​​and second power values, and for the same heating device, the first power value is greater than the second power value;

[0020] According to the operating parameters and ambient temperature, determine the heating power of the heating equipment that needs to be turned on, including:

[0021] If the ambient temperature is less than the first temperature threshold, it is determined that the heating powers of the heating devices of the pipe body section and the pump end interface section are both the first power values ​​corresponding to each other;

[0022] If the ambient temperature is greater than or equal to the first temperature threshold and less than or equal to the second temperature threshold, the heating power of the heating equipment of the pipe body section and the pump end interface section is determined from the corresponding first power values ​​and second power values ​​according to the ambient temperature and vehicle speed.

[0023] In combination with the first aspect, in a possible implementation of the first aspect, determining the heating power of the heating device of the pipe body section and the pump end interface section from the respective corresponding first power values ​​and second power values ​​according to the ambient temperature and the vehicle speed includes:

[0024] If the ambient temperature is lower than a preset third temperature threshold, and the vehicle speed is greater than or equal to the preset vehicle speed threshold, the heating powers of the heating devices of the pipe body section and the pump end interface section are determined to be the first power values ​​corresponding to each other; wherein the third temperature threshold is greater than the first temperature threshold and less than the second temperature threshold;

[0025] If the ambient temperature is greater than or equal to the third temperature threshold, or the ambient temperature is less than the third temperature threshold and the vehicle speed is less than the vehicle speed threshold, the heating powers of the heating devices of the pipe body section and the pump end interface section are determined to be the corresponding second power values.

[0026] In combination with the first aspect, in a possible implementation of the first aspect, determining the heating power of the heating device to be turned on according to the operating parameters and the ambient temperature includes:

[0027] If the heating device of the nozzle section needs to be turned on, the heating power of the heating device of the nozzle section is determined according to the exhaust temperature and a preset exhaust temperature and power relationship curve.

[0028] In combination with the first aspect, in a possible implementation of the first aspect, at the same time, the heating power of the heating device of the nozzle segment is smaller than the heating power of the heating device of the pipe body segment, and the heating power of the heating device of the pipe body segment is smaller than the heating power of the heating device of the pump end interface segment.

[0029] A second aspect of an embodiment of the present invention provides a urea delivery pipeline heating device, wherein the urea delivery pipeline of a vehicle is divided into at least two sections, and each section of the urea delivery pipeline is provided with an independent heating device;

[0030] The device includes:

[0031] An acquisition module, used to acquire the operating parameters and ambient temperature of the vehicle;

[0032] A processing module, used to determine whether the heating equipment of each section of the urea delivery pipeline needs to be turned on according to the operating parameters and the ambient temperature, and determine the heating power of the heating equipment that needs to be turned on;

[0033] The control module is used to control the heating equipment that needs to be turned on to start operation according to the heating power.

[0034] A third aspect of an embodiment of the present invention provides a controller, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the steps of the method in the first aspect or any one of the implementations of the first aspect are implemented.

[0035] A fourth aspect of an embodiment of the present invention provides a vehicle, comprising a controller as described in the third aspect above.

[0036] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0037] The embodiment of the present invention divides the urea delivery pipeline into at least two sections, and each section of the urea delivery pipeline is provided with an independent heating device, that is, the arrangement of the traditional series heating wires is changed to segmented independent heating, so that the heating function is more targeted and the accuracy requirement for the heating resistance wire is greatly reduced; further, the heating equipment of each section of the urea delivery pipeline is accurately controlled in power according to the operating parameters and ambient temperature of the vehicle, which can solve the problem of local overheating or unsuccessful thawing caused by excessive or insufficient power. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0039] Figure 1 is a structural example diagram of a urea system for a vehicle provided in an embodiment of the present invention;

[0040] Figure 2 1 is a schematic diagram of the structure of a urea delivery pipeline provided by an embodiment of the present invention;

[0041] Figure 3 It is a schematic diagram of the overall heating line wiring of the urea delivery pipeline provided by an embodiment of the present invention;

[0042] Figure 4 Schematic diagram of heating wire wiring of each part of the urea delivery pipeline provided by the embodiment of the present invention; wherein a is a schematic diagram of wiring of the pipe body section; b is a schematic diagram of wiring of the nozzle section; c is a schematic diagram of wiring of the pump end interface section; d is a schematic diagram of the quick plug-in;

[0043] Figure 5 The following is a schematic diagram of the process of heating the urea delivery pipeline provided by the embodiment of the present invention. Figure 1 ;

[0044] Figure 6 The following is a schematic diagram of the process of heating the urea delivery pipeline provided by the embodiment of the present invention. Figure 2 ;

[0045] Figure 7 1 is a schematic diagram of the structure of a urea delivery pipeline heating device provided in an embodiment of the present invention;

[0046] Figure 8 It is a schematic diagram of the structure of a controller provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0047] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present invention. However, it should be clear to those skilled in the art that the present invention may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present invention.

[0048] In order to illustrate the technical solution of the present invention, a specific embodiment is provided below for illustration.

[0049] See also Figure 1 As shown, the current urea system mainly consists of: urea injection control unit (Dosing Control Unit, DCU), electronic controller unit (Electronic Control Unit, ECU), execution and information acquisition module (urea pump integrating multiple sensors), storage structure (urea tank), delivery structure (delivery pipe), injection execution structure (nozzle).

[0050] The nozzle is usually arranged in the mixing chamber of the exhaust system. The ambient temperature when the vehicle is running is relatively high, and most of the urea tanks are arranged in the middle or rear of the vehicle chassis. The urea delivery pipeline connects the urea pump to deliver the urea liquid to the nozzle, so there is a large temperature difference in different layout positions of the urea delivery pipeline. The freezing point of urea solution is -11℃. In winter in colder areas, urea is likely to freeze. To ensure the supply of urea solution, the urea pump and urea delivery pipeline both have heating structures. The former heats the urea in the urea tank, and the latter ensures that the liquid in the pipeline does not freeze.

[0051] At present, the mainstream urea delivery pipe is mostly heated by heating wires, which are built into the pipeline channel or wrapped around the outer wall of the pipeline to achieve the heating function. In order to effectively distribute the heating power, the two joints and the pipe body of the urea delivery pipe have different resistance values ​​of the heating wires, so that the power is different. However, in this case, each section of the heating harness is also connected in series. When the vehicle is running in a cold environment, the temperature at the nozzle end can be greater than 100°C, while the temperature at the urea pump end may be lower than -30°C. At present, the maximum temperature tolerance of the delivery pipe material is generally 130°C. Because the pipeline heating wires are connected in series and the resistance value is small, there are fewer specifications available in the market to ensure the accuracy of the heating wires. If the matching is unreasonable, it is very easy to cause the nozzle end to overheat and burn during the vehicle driving process when the heating power is too high, or the power design is too small, the low temperature of the urea pump end cannot be thawed, and urea cannot be supplied.

[0052] In view of this, the present invention proposes a urea delivery pipeline with segmented heating. The urea delivery pipeline is divided into at least two sections, and each section of the urea delivery pipeline is provided with an independent heating device. The traditional arrangement of the series heating line is changed to segmented independent heating. According to the arrangement environment temperature and the driving state of the whole vehicle, the heating part of the urea delivery pipe is reasonably selected to be turned on, so that the heating function is more effective and targeted, and the occurrence of insufficient heating or thawing is avoided.

[0053] Considering that the temperature of the urea solution in the urea tank cannot be too high, the urea tank needs to be arranged away from the exhaust pipe, so the temperature of the urea pump end is less affected by the exhaust temperature. The urea delivery pipeline is arranged from the urea pump to the nozzle, and the intermediate pipeline is arranged with the vehicle. The ambient temperature will vary greatly, but the lowest temperature point is still near the urea pump port, and the highest point is near the nozzle. Therefore, refer to Figure 2 As shown, in this embodiment, the urea delivery pipeline can be divided into three parts: the nozzle section, the pipe section and the pump end interface section. The three parts are designed as independent heating devices and are not affected by each other. The pump end interface section needs to be designed with the largest power because it needs to take into account the function of thawing the urea pump joint, followed by the pipeline, and the heating line near the nozzle joint has the smallest power.

[0054] The heating device can adopt an external heating form, and the heating wire is wound around the outer wall of the tube body.

[0055] Please also see Figure 3 and Figure 4 As shown, the inner layer of the urea delivery pipeline is a urea solution channel, the outer wall of the inner layer is wrapped with a heating harness, and the outer side of the heating harness is covered with a sheath for protection. To ensure the heating effect, the heating wires of the pump end interface and the pipe body are evenly arranged in a spiral winding manner. The nozzle heating wire is spirally wound in the reserved groove of the quick-plug connector and connected to the quick-plug connector in a straight line through the pipe body. Due to its own small resistance value, the influence of the straight-line arrangement on the heating of the pipe body can be reduced. In order to reduce the number of harness plug-ins, the three sections of heating wires are all gathered at the pump end quick-plug position to form the positive and negative terminals of the three sections of heating wires.

[0056] The controller DCU controls the opening and closing of the three-section heating wire of the urea delivery pipeline, and can control the power of each section of the heating wire according to the actual vehicle operation conditions and ambient temperature.

[0057] Alternatively, if Figure 5 As shown, the urea delivery pipeline heating method includes:

[0058] Step S501, obtaining the vehicle's operating parameters and ambient temperature.

[0059] In this embodiment, the operating parameters include but are not limited to vehicle speed, exhaust temperature, etc. The exhaust temperature is detected by a temperature sensor in the vehicle exhaust pipe, and the ambient temperature is detected by an ambient temperature sensor.

[0060] Step S502, judging whether the heating equipment of each section of the urea delivery pipeline needs to be turned on according to the operating parameters and the ambient temperature, and determining the heating power of the heating equipment that needs to be turned on. According to the heating power, the heating equipment that needs to be turned on is controlled to start operation.

[0061] In this embodiment, the start-up conditions of the heating device are different for different parts of the urea delivery pipeline. Under different operating parameters and ambient temperature conditions, the temperature of each section of the urea delivery pipeline is also different, so the start-up power of the heating device of each section is also different. Reasonable selection of the heating part of the urea delivery pipe can make the heating function more targeted and avoid insufficient heating or thawing.

[0062] In some embodiments, for the nozzle segment, if the ambient temperature is less than a preset first temperature threshold, and the exhaust temperature is less than a preset exhaust temperature threshold, it is determined that the heating device of the nozzle segment needs to be turned on;

[0063] Otherwise, it is determined that the heating device of the nozzle segment does not need to be turned on.

[0064] Here, since the nozzle segment is arranged in the mixing chamber of the exhaust system, it can be heated by the vehicle exhaust. When the vehicle is started, the temperature of the nozzle segment is higher than other parts of the urea delivery pipeline. Therefore, the first temperature threshold is set lower. For example, the first temperature threshold can be -7°C.

[0065] When the ambient temperature is lower than -7°C, if the vehicle has just been started and the exhaust temperature is low, for example, lower than the exhaust temperature threshold of 80°C, the heating device needs to be turned on for heating.

[0066] As the exhaust temperature increases, when the exhaust temperature is greater than 80°C, the heating equipment can be turned off and the exhaust temperature can be used for heating to avoid nozzle overheating and ablation.

[0067] When the ambient temperature is higher than -7°C, the exhaust temperature can be used for heating to meet the demand.

[0068] In this embodiment, when the nozzle segment heating device needs to be turned on, the heating device can be set to run at full power at maximum power. Alternatively, the heating power of the nozzle segment heating device can be determined according to the exhaust temperature and a preset exhaust temperature-power relationship curve to achieve more accurate temperature control.

[0069] In some embodiments, for the pipe body section and the pump end interface section, if the ambient temperature is less than a preset second temperature threshold, it is determined that the heating device of the pipe body section and the pump end interface section needs to be turned on;

[0070] If the ambient temperature is greater than or equal to the second temperature threshold, it is determined that the heating devices of the pipe body section and the pump end interface section do not need to be turned on;

[0071] The second temperature threshold is greater than the first temperature threshold.

[0072] Here, since the pipe body section and the pump end interface section are not heated by exhaust gas, the second temperature threshold as the condition for turning on the heating device must be higher than the first temperature threshold. For example, the first temperature threshold is 0°C. When the ambient temperature is higher than 0°C, it is determined that there is no risk of urea freezing, and the heating function of the urea delivery pipe is turned off.

[0073] Optionally, the heating devices of the pipe body section and the pump end interface section are preset with respective corresponding first power values ​​and second power values, and for the same heating device, the first power value is greater than the second power value. In this embodiment, when determining the heating powers of the heating devices of the pipe body section and the pump end interface section according to the above-mentioned operating parameters and ambient temperature, if the ambient temperature is less than the first temperature threshold, it is determined that the heating powers of the heating devices of the pipe body section and the pump end interface section are both the respective corresponding first power values;

[0074] If the ambient temperature is greater than or equal to the first temperature threshold but less than or equal to the second temperature threshold, the heating power of the heating equipment of the pipe body section and the pump end interface section is determined from the corresponding first power values ​​and second power values ​​according to the ambient temperature and vehicle speed.

[0075] In this embodiment, when the ambient temperature is lower than -7°C, the ambient temperature is very low, and the heating equipment of the pipe body section and the pump end interface section requires a larger heating power. For example, the heating equipment of the pipe body section and the pump end interface section can be set to operate at full power with maximum power. When the ambient temperature is between -7°C and 0°C, the external ambient temperature is increased, and the risk of urea freezing is reduced. At this time, the heating equipment of the pipe body section and the pump end interface section can be controlled to heat at half power. However, since the vehicle speed affects the temperature of the pipe body section and the pump end interface section, whether to use the heating equipment to heat at half power depends on the vehicle speed.

[0076] As a possible implementation, according to the ambient temperature and the vehicle speed, the heating power of the heating devices of the pipe body section and the pump end interface section is determined from the first power value and the second power value corresponding to each other, including:

[0077] If the ambient temperature is lower than a preset third temperature threshold, and the vehicle speed is greater than or equal to the preset vehicle speed threshold, the heating powers of the heating devices of the pipe body section and the pump end interface section are determined to be the first power values ​​corresponding to each other; wherein the third temperature threshold is greater than the first temperature threshold and less than the second temperature threshold;

[0078] If the ambient temperature is greater than or equal to the third temperature threshold, or the ambient temperature is less than the third temperature threshold but the vehicle speed is less than the vehicle speed threshold, the heating power of the heating equipment of the pipe body section and the pump end interface section is determined to be the respective corresponding second power values.

[0079] Optionally, the third temperature threshold may be -3°C. When the ambient temperature is between -7°C and -3°C, the risk of urea freezing is reduced. The vehicle speed is judged continuously. If the vehicle speed is higher than 60km / h, the pump end interface section and the pipe section at the bottom of the chassis lose heat faster due to the high wind speed. Therefore, the heating device should continue to be heated at full power. On the contrary, if the vehicle speed is lower than 60km / h, the heating device should be kept at half heating power. When the ambient temperature is between -3°C and 0°C, the risk of freezing is further reduced, and the risk of heat loss caused by the vehicle speed is negligible. The heating device only needs to be heated at half power. It is worth noting that the nozzle section is arranged on the exhaust mixing chamber, which is greatly affected by the radiant heat, and the arrangement environment is relatively shielded. Therefore, the gas flow rate is relatively less affected by the vehicle speed, so there is no need to consider the impact of the vehicle speed.

[0080] It is understandable that in the embodiment of the present invention, according to the characteristics that the heating temperature requirements of the nozzle section, the pipe section and the pump end interface section increase in sequence, the heating power of the pump end interface section can be designed to be the largest, the heating power of the pipe section is second, and the heating power of the pump end interface section is the smallest. Then, at the same time, the heating power of the heating device of the nozzle section is smaller than the heating power of the heating device of the pipe section, and the heating power of the heating device of the pipe section is smaller than the heating power of the heating device of the pump end interface section.

[0081] For example:

[0082] When the ambient temperature is lower than -7°C, if the heating devices of the nozzle section, the pipe body section and the pump end interface section are all running at full power, the power of the heating devices of the nozzle section, the pipe body section and the pump end interface section will increase in sequence.

[0083] When the ambient temperature is between -7°C and -3°C, the heating equipment of the pipe body section and the pump end interface section operates at full power or half power, and the power of the heating equipment of the pipe body section and the pump end interface section increases successively.

[0084] It can be seen that the present embodiment divides the urea delivery pipeline into at least two sections, and each section of the urea delivery pipeline is provided with an independent heating device, that is, the arrangement of the traditional series heating wires is changed to segmented independent heating, so that the heating function is more targeted and the accuracy requirement for the heating resistance wire is greatly reduced; further, the heating equipment of each section of the urea delivery pipeline is precisely controlled in power through the vehicle's operating parameters and ambient temperature, which can solve the problem of local overheating or unsuccessful thawing caused by excessive or insufficient power.

[0085] In combination with the above, in one embodiment, the overall implementation process of the urea delivery pipeline heating method can also be as follows: Figure 6 As shown, including:

[0086] (1) When the engine is started, the ambient temperature is detected. If it is <-7°C and the exhaust temperature is <80°C, the heating equipment of the nozzle section, pipe section and pump end interface section is turned on and heated at full power;

[0087] (2) As the engine is running, the exhaust temperature is ≥80°C, the nozzle section heating equipment is controlled to be turned off, and the heating equipment of the pipe section and the pump end interface section is kept at full power heating;

[0088] (3) When the ambient temperature is detected to be -7℃<≤-3℃, the vehicle speed is determined; if the vehicle speed is ≥60km / h, the heating equipment of the pipe body section and the pump end interface section is controlled to maintain full power heating; if the vehicle speed is <60km / h, the heating equipment of the pipe body section and the pump end interface section is controlled to heat at half power;

[0089] (4) When it is detected that the ambient temperature is -3℃<≤0℃, the heating equipment of the pipe body section and the pump end interface section is controlled to heat at half power;

[0090] (5) When the ambient temperature is detected to be >0°C, all heating devices are turned off.

[0091] The present invention changes the traditional urea delivery pipeline heating wire from a series type into a three-stage independent control, which is not affected by each other, greatly reduces the accuracy requirement for the heating resistance wire, and can compensate for the local overheating or unsuccessful thawing caused by excessive or insufficient power. By controlling the power size of each section of the wire harness under different conditions, unnecessary energy loss is reduced.

[0092] It should be understood that the order of execution of the steps in the above embodiment does not necessarily mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present invention.

[0093] Figure 7 is a schematic diagram of the structure of a urea delivery pipeline heating device provided by an embodiment of the present invention, see Figure 7 As shown, the device 70 includes:

[0094] The acquisition module 71 is used to acquire the operating parameters and ambient temperature of the vehicle.

[0095] The processing module 72 is used to determine whether the heating equipment of each section of the urea delivery pipeline needs to be turned on according to the operating parameters and the ambient temperature, and determine the heating power of the heating equipment that needs to be turned on.

[0096] The control module 73 is used to control the heating equipment that needs to be turned on to start operation according to the heating power.

[0097] As a possible implementation, the at least two sections include a nozzle section, and the operating parameter includes the exhaust temperature. The processing module 72 is used to:

[0098] If the ambient temperature is lower than a preset first temperature threshold, and the exhaust temperature is lower than a preset exhaust temperature threshold, it is determined that the heating device of the nozzle segment needs to be turned on;

[0099] Otherwise, it is determined that the heating device of the nozzle segment does not need to be turned on.

[0100] As a possible implementation manner, the at least two sections also include a pipe body section and a pump end interface section.

[0101] The processing module 72 is used for:

[0102] If the ambient temperature is lower than a preset second temperature threshold, it is determined that the heating devices of the pipe body section and the pump end interface section need to be turned on;

[0103] If the ambient temperature is greater than or equal to the second temperature threshold, it is determined that the heating devices of the pipe body section and the pump end interface section do not need to be turned on;

[0104] The second temperature threshold is greater than the first temperature threshold.

[0105] As a possible implementation method, the operating parameters also include vehicle speed, and the heating devices of the pipe body section and the pump end interface section are preset with their own corresponding first power value and second power value, and for the same heating device, the first power value is greater than the second power value.

[0106] The processing module 72 is used for:

[0107] If the ambient temperature is less than the first temperature threshold, it is determined that the heating powers of the heating devices of the pipe body section and the pump end interface section are both the first power values ​​corresponding to each other;

[0108] If the ambient temperature is greater than or equal to the first temperature threshold but less than or equal to the second temperature threshold, the heating power of the heating equipment of the pipe body section and the pump end interface section is determined from the corresponding first power values ​​and second power values ​​according to the ambient temperature and vehicle speed.

[0109] As a possible implementation manner, the processing module 72 is specifically configured to:

[0110] If the ambient temperature is lower than a preset third temperature threshold, and the vehicle speed is greater than or equal to the preset vehicle speed threshold, the heating powers of the heating devices of the pipe body section and the pump end interface section are determined to be the first power values ​​corresponding to each other; wherein the third temperature threshold is greater than the first temperature threshold and less than the second temperature threshold;

[0111] If the ambient temperature is greater than or equal to the third temperature threshold, or the ambient temperature is less than the third temperature threshold but the vehicle speed is less than the vehicle speed threshold, the heating power of the heating equipment of the pipe body section and the pump end interface section is determined to be the respective corresponding second power values.

[0112] As a possible implementation manner, the processing module 72 is used to:

[0113] If the heating device of the nozzle section needs to be turned on, the heating power of the heating device of the nozzle section is determined according to the exhaust temperature and a preset exhaust temperature-power relationship curve.

[0114] As a possible implementation, at the same time, the heating power of the nozzle segment heating device is smaller than the heating power of the pipe segment heating device, and the heating power of the pipe segment heating device is smaller than the heating power of the pump end interface segment heating device.

[0115] Figure 8 FIG. 8 is a schematic diagram of a controller 80 provided in one embodiment of the present invention. Figure 8 As shown, the controller 80 of this embodiment includes: a processor 81, a memory 82, and a computer program 83 stored in the memory 82 and executable on the processor 81, such as a urea delivery pipeline heating program. When the processor 81 executes the computer program 83, the steps in the above-mentioned urea delivery pipeline heating method embodiments are implemented, such as Figure 5 Alternatively, when the processor 81 executes the computer program 83, the functions of each module in the above-mentioned device embodiments are implemented, for example Figure 7 The functions of modules 71 to 73 are shown.

[0116] Exemplarily, the computer program 83 may be divided into one or more modules / units, one or more modules / units are stored in the memory 82, and executed by the processor 81 to implement the present invention. One or more modules / units may be a series of computer program instruction segments capable of implementing specific functions, and the instruction segments are used to describe the execution process of the computer program 83 in the controller 80.

[0117] The controller 80 may include, but is not limited to, a processor 81 and a memory 82. Those skilled in the art will appreciate that Figure 8 This is only an example of the controller 80 and does not constitute a limitation of the controller 80. The controller 80 may include more or fewer components than shown in the figure, or a combination of certain components, or different components. For example, the controller 80 may also include input and output devices, network access devices, buses, etc.

[0118] The processor 81 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc.

[0119] The memory 82 may be an internal storage unit of the controller 80, such as a hard disk or memory of the controller 80. The memory 82 may also be an external storage device of the controller 80, such as a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. equipped on the controller 80. Further, the memory 82 may also include both an internal storage unit of the controller 80 and an external storage device. The memory 82 is used to store computer programs and other programs and data required by the controller 80. The memory 82 may also be used to temporarily store data that has been output or is to be output.

[0120] The technicians in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In practical applications, the above-mentioned function allocation can be completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated in a processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, which will not be repeated here.

[0121] An embodiment of the present invention further provides a vehicle, which includes the controller as described above.

[0122] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0123] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0124] In the embodiments provided by the present invention, it should be understood that the disclosed devices / controllers and methods can be implemented in other ways. For example, the device / controller embodiments described above are only schematic, for example, the division of modules or units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0125] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0126] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0127] If the integrated module / unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present invention implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. Computer-readable media can include: any entity or device that can carry computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electrical carrier signal, telecommunication signal and software distribution medium, etc.

[0128] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention.

Claims

1. A urea delivery pipeline heating method, characterized in that: The urea delivery pipeline of the vehicle is divided into at least two sections, and each section of the urea delivery pipeline is provided with an independent heating device; The method comprises: Obtaining operating parameters and ambient temperature of the vehicle; According to the operating parameters and the ambient temperature, judging whether the heating equipment of each section of the urea delivery pipeline needs to be turned on, and determining the heating power of the heating equipment that needs to be turned on; According to the heating power, the heating equipment that needs to be turned on is controlled to start operation.

2. The urea delivery pipeline heating method according to claim 1, characterized in that: The at least two sections include a nozzle section, and the operating parameters include exhaust gas temperature; The step of judging whether the heating equipment of each section of the urea delivery pipeline needs to be turned on according to the operating parameters and the ambient temperature includes: If the ambient temperature is lower than a preset first temperature threshold, and the exhaust temperature is lower than a preset exhaust temperature threshold, it is determined that the heating device of the nozzle segment needs to be turned on; Otherwise, it is determined that the heating device of the nozzle segment does not need to be turned on.

3. The urea delivery pipeline heating method according to claim 2, characterized in that: The at least two sections also include a pipe body section and a pump end interface section; The step of judging whether the heating equipment of each section of the urea delivery pipeline needs to be turned on according to the operating parameters and the ambient temperature also includes: If the ambient temperature is lower than a preset second temperature threshold, it is determined that the heating devices of the pipe body section and the pump end interface section need to be turned on; If the ambient temperature is greater than or equal to the second temperature threshold, it is determined that the heating devices of the pipe body section and the pump end interface section do not need to be turned on; The second temperature threshold is greater than the first temperature threshold.

4. The urea delivery pipeline heating method according to claim 3, characterized in that: The operating parameters also include vehicle speed, the heating devices of the pipe body section and the pump end interface section are preset with respective corresponding first power values ​​and second power values, and for the same heating device, the first power value is greater than the second power value; Determining the heating power of the heating device to be turned on according to the operating parameters and the ambient temperature includes: If the ambient temperature is lower than the first temperature threshold, determining that the heating powers of the heating devices of the pipe body section and the pump end interface section are both the first power values ​​corresponding to each other; If the ambient temperature is greater than or equal to the first temperature threshold and less than or equal to the second temperature threshold, the heating power of the heating equipment of the pipe body section and the pump end interface section is determined from the corresponding first power value and the second power value according to the ambient temperature and the vehicle speed.

5. The urea delivery pipeline heating method according to claim 4, characterized in that: The step of determining the heating powers of the heating devices of the pipe body section and the pump end interface section from the first power value and the second power value respectively corresponding to the ambient temperature and the vehicle speed comprises: If the ambient temperature is lower than a preset third temperature threshold, and the vehicle speed is greater than or equal to a preset vehicle speed threshold, the heating powers of the heating devices of the pipe body section and the pump end interface section are determined to be the first power values ​​corresponding to each other; wherein the third temperature threshold is greater than the first temperature threshold and less than the second temperature threshold; If the ambient temperature is greater than or equal to the third temperature threshold, or the ambient temperature is less than the third temperature threshold and the vehicle speed is less than the vehicle speed threshold, the heating power of the heating equipment of the pipe body section and the pump end interface section is determined to be the second power value corresponding to each other.

6. The urea delivery pipeline heating method according to claim 2, characterized in that: Determining the heating power of the heating device to be turned on according to the operating parameters and the ambient temperature includes: If the heating device of the nozzle segment needs to be turned on, the heating power of the heating device of the nozzle segment is determined according to the exhaust temperature and a preset exhaust temperature and power relationship curve.

7. The urea delivery pipeline heating method according to any one of claims 3 to 6, characterized in that: At the same time, the heating power of the heating device of the nozzle section is smaller than the heating power of the heating device of the pipe section, and the heating power of the heating device of the pipe section is smaller than the heating power of the heating device of the pump end interface section.

8. A urea delivery pipeline heating device, characterized in that: The urea delivery pipeline of the vehicle is divided into at least two sections, and each section of the urea delivery pipeline is provided with an independent heating device; The device comprises: An acquisition module, used to acquire the operating parameters and ambient temperature of the vehicle; A processing module, used for judging whether the heating equipment of each section of the urea delivery pipeline needs to be turned on according to the operating parameters and the ambient temperature, and determining the heating power of the heating equipment that needs to be turned on; The control module is used to control the heating equipment that needs to be turned on to start operation according to the heating power.

9. A controller comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 7 are implemented.

10. A vehicle, characterized in that: Comprising a controller as claimed in claim 9 above.

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