Scr thermal management method, apparatus, and device

Abstract

The application provides an SCR heat management method, device and equipment, the SCR heat management method comprises the following steps: when the engine is in a first heating mode, the change of the SCR inlet temperature is monitored; whether the vehicle is in a long downhill road condition is monitored according to the change of the SCR inlet temperature; if the vehicle is in the long downhill road condition, the engine is controlled to enter a second heating mode, wherein the heating power and the fuel consumption rate of the second heating mode are greater than the heating power and the fuel consumption rate of the first heating mode. The application utilizes the advantages that the SCR inlet temperature fluctuation is small, easy to obtain and the value is accurate, monitors whether the vehicle is in the long downhill road condition according to the change of the SCR inlet temperature, takes the vehicle in the long downhill road condition as the basis for switching the heating mode, helps to realize the reasonable control of the heating mode, and thus controls the fuel consumption and improves the economy on the basis of ensuring the emission standard.

Description

Technical Field

[0001] This invention relates to the field of post-processing system diagnostics, and in particular to an SCR thermal management method, apparatus, and equipment. Background Technology

[0002] With the implementation of the China VI emission standards, current diesel engines are all equipped with exhaust aftertreatment systems to reduce nitrogen oxide and particulate emissions in engine exhaust. Among these systems, SCR (Selective Catalytic Reduction) is a crucial component. The SCR reaction needs to occur within a suitable temperature range to maximize its efficiency and ensure the complete reaction of reactants (urea and nitrogen oxides). Therefore, SCR thermal management has a significant impact on ensuring the effectiveness of exhaust aftertreatment.

[0003] Specifically, when the engine cannot meet the SCR temperature requirements in conventional combustion mode, the combustion mode is changed to increase the vehicle's exhaust temperature, heating the SCR and allowing it to operate within its optimal temperature range to ensure the vehicle meets emission limits. However, a higher exhaust temperature combustion mode also means increased fuel consumption. Under low-load conditions, meeting emission requirements inevitably sacrifices fuel economy. Different low-load conditions produce different temperature reductions, requiring varying heating power. Current SCR thermal management methods cannot control heating power according to different low-load conditions, easily leading to excessive fuel consumption and low fuel economy. Summary of the Invention

[0004] The main objective of this invention is to provide an SCR thermal management method, apparatus, and equipment, which aims to solve the technical problems of excessive oil consumption and low economic efficiency in existing SCR thermal management methods.

[0005] In a first aspect, the present invention provides an SCR thermal management method, the SCR thermal management method comprising:

[0006] When the engine is in primary heating mode, monitor the changes in SCR inlet temperature.

[0007] Monitor whether the vehicle is on a long downhill road condition based on the changes in SCR inlet temperature;

[0008] If the vehicle is on a long downhill road, the engine is controlled to enter a secondary heating mode, wherein the heating power and fuel consumption rate of the secondary heating mode are greater than those of the primary heating mode.

[0009] Furthermore, in one embodiment, the step of monitoring changes in the SCR inlet temperature includes:

[0010] Real-time sampling of SCR inlet temperature;

[0011] Calculate the average value of a certain number of recently sampled SCR inlet temperatures, and use the average value after rounding or retaining a specified number of decimal places as the temperature reference value at the current moment;

[0012] If the difference between the current temperature reference value and the previous temperature reference value is greater than 0, then the change in the SCR inlet temperature at the current time is determined to be a temperature rise.

[0013] If the difference between the current temperature reference value and the previous temperature reference value is less than 0, then the change in the SCR inlet temperature at the current time is determined to be a temperature decrease.

[0014] If the difference between the current temperature reference value and the previous temperature reference value is 0, then the change in the SCR inlet temperature at the current time is determined to be that the temperature remains unchanged.

[0015] Furthermore, in one embodiment, the step of monitoring changes in the SCR inlet temperature includes:

[0016] Real-time sampling of SCR inlet temperature;

[0017] If the difference between the SCR inlet temperature at the current moment and the previous moment is greater than a, then the change in the SCR inlet temperature at the current moment is determined to be a temperature increase, and a is greater than 0.

[0018] If the difference between the current SCR inlet temperature and the previous time is less than -a, then the change in the current SCR inlet temperature is determined to be a temperature decrease.

[0019] If the absolute value of the difference between the SCR inlet temperature at the current moment and the previous moment is less than or equal to a, then the change in the SCR inlet temperature at the current moment is determined to be a constant temperature.

[0020] Furthermore, in one embodiment, the step of monitoring whether the vehicle is on a long downhill slope based on changes in the SCR inlet temperature includes:

[0021] If the current SCR inlet temperature is decreasing, the counter value is incremented by a first positive value, and the initial value of the counter value is 0.

[0022] If the current SCR inlet temperature is rising, then the counter value is reduced by a second positive value;

[0023] When the counter value is less than 0, the counter value is reset to 0;

[0024] When the counter value is greater than a preset threshold, it is determined that the vehicle is on a long downhill road.

[0025] Furthermore, in one embodiment, the step of monitoring whether the vehicle is on a long downhill slope based on changes in the SCR inlet temperature further includes:

[0026] If the current SCR inlet temperature remains unchanged and the duration of this unchanged temperature is less than a preset duration, then the counter value remains unchanged.

[0027] If the current SCR inlet temperature remains constant and the duration of this constant temperature is greater than or equal to a preset duration, then the counter value is reset to 0.

[0028] Furthermore, in one embodiment, the second positive value is greater than the first positive value.

[0029] Furthermore, in one embodiment, the step of monitoring whether the vehicle is on a long downhill slope based on changes in the SCR inlet temperature includes:

[0030] If the SCR inlet temperature changes consistently by a predetermined number of time intervals, indicating a temperature decrease, then the vehicle is determined to be on a long downhill slope.

[0031] Furthermore, in one embodiment, the SCR thermal management method further includes:

[0032] When the engine is in the first-level heating mode, monitor whether the SCR bed temperature is within the preset temperature range.

[0033] If the SCR bed temperature is within the preset temperature range, the engine is controlled to enter the secondary heating mode.

[0034] Secondly, the present invention also provides an SCR thermal management device, the SCR thermal management device comprising:

[0035] The first monitoring module is used to monitor the changes in SCR inlet temperature when the engine is in the first-stage heating mode.

[0036] The second monitoring module is used to monitor whether the vehicle is on a long downhill road condition based on the changes in the SCR inlet temperature.

[0037] An execution module is configured to control the engine to enter a secondary heating mode if the vehicle is on the long downhill road, wherein the heating power and fuel consumption rate of the secondary heating mode are greater than those of the primary heating mode.

[0038] Thirdly, the present invention also provides an SCR thermal management device, the SCR thermal management device including a processor, a memory, and an SCR thermal management program stored in the memory and executable by the processor, wherein when the SCR thermal management program is executed by the processor, it implements the steps of the above-described SCR thermal management method.

[0039] In this invention, the heating mode is further divided into a primary heating mode and a secondary heating mode. The secondary heating mode can quickly provide a higher exhaust temperature, and correspondingly, fuel consumption is also higher. Under normal circumstances, only the primary heating mode is needed to meet the SCR temperature requirements. When the vehicle is on a long downhill slope, the driver usually downshifts to increase engine speed and uses engine braking to reduce vehicle speed. At this time, fuel consumption is significantly reduced, and engine exhaust temperature is lowered, requiring the use of the secondary heating mode to meet the SCR temperature requirements. This invention utilizes the advantages of low fluctuation in SCR inlet temperature, easy acquisition, and accurate values. It monitors whether the vehicle is on a long downhill slope based on changes in the SCR inlet temperature, using this as the basis for switching heating modes. This helps to achieve reasonable control of the heating mode, thereby controlling fuel consumption and improving economy while ensuring emission compliance. Attached Figure Description

[0040] Figure 1 This is a schematic flowchart of an SCR thermal management method according to an embodiment of the present invention;

[0041] Figure 2 This is a logic diagram of a counter in one embodiment of the present invention;

[0042] Figure 3 This is a schematic diagram of the counter value and SCR inlet temperature in one embodiment of the present invention;

[0043] Figure 4 This is a schematic diagram of the counter judgment result and SCR inlet temperature in one embodiment of the present invention;

[0044] Figure 5 This is a flowchart illustrating the SCR thermal management method in another embodiment of the present invention;

[0045] Figure 6 This is a schematic diagram of the hardware structure of an SCR thermal management device in one embodiment of the present invention.

[0046] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0047] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0048] In a first aspect, embodiments of the present invention provide an SCR thermal management method.

[0049] Figure 1 A schematic flowchart of an SCR thermal management method according to an embodiment of the present invention is shown.

[0050] Reference Figure 1 In one embodiment, the SCR thermal management method includes the following steps:

[0051] S11. When the engine is in the first-stage heating mode, monitor the change in SCR inlet temperature;

[0052] Specifically, vehicle exhaust temperature is mainly affected by combustion mode, operating conditions, load, and environment. Combustion mode refers to the engine's combustion control strategy. Under different combustion modes, combustion parameters such as rail pressure (controlled by the high-pressure common rail system), air-fuel ratio (controlled by the throttle valve), and EGR (Exhaust Gas Recirculation) valve opening vary to adapt to different functional requirements. The main strategy of SCR thermal management is to increase the vehicle's exhaust temperature by changing the combustion mode when the engine cannot meet the SCR temperature requirements under conventional combustion mode. This heats the SCR, allowing it to operate within its optimal temperature range to the maximum extent possible, enabling the vehicle to meet emission limits. This modified combustion mode is described as a heating mode. Compared to the conventional combustion mode, the heating mode increases exhaust temperature by lowering the air-fuel ratio, increasing the EGR valve opening, and increasing the rail pressure to meet SCR temperature requirements.

[0053] In this embodiment, the primary heating mode and the secondary heating mode (described later) represent a refined classification of existing heating modes. By adjusting combustion parameters such as rail pressure, air-fuel ratio, EGR valve opening, and timing, the heating power and fuel consumption rate of the secondary heating mode are greater than those of the primary heating mode. That is, the secondary heating mode can quickly provide higher exhaust temperatures, and correspondingly, fuel consumption is also higher. When the conditions for entering the heating mode are met, the engine first enters the primary heating mode. Under normal circumstances, only the primary heating mode is needed to meet the SCR temperature requirements. The conditions for entering the heating mode are relatively complex. Simply put, the engine condition meets the requirements (coolant, ambient temperature, etc.), operating parameters are collected, and it is predicted that the SCR injection temperature cannot be reached under these conditions, at which point the engine enters the heating mode. This invention mainly discusses the conditions for transitioning from the primary heating mode to the secondary heating mode.

[0054] It should be noted that the SCR reaction takes place inside the carrier, and the internal temperature of the carrier directly affects the SCR reaction efficiency; therefore, the internal temperature of the carrier is also called the SCR bed temperature. Since sensors cannot be placed inside the carrier, the SCR bed temperature is generally obtained through a combination of thermocouple wires and thermal field algorithms. The SCR inlet temperature can be directly acquired by a sensor placed at the SCR inlet, thus offering advantages such as low fluctuation, ease of acquisition, and accurate values. The SCR bed temperature is lower than the SCR inlet temperature.

[0055] S12. Monitor whether the vehicle is on a long downhill road condition based on the changes in the SCR inlet temperature.

[0056] Specifically, when a vehicle is on a long downhill road, the driver usually downshifts to increase the engine speed and uses engine drag to reduce the vehicle speed. At this time, the fuel consumption level is significantly reduced and the engine exhaust temperature is reduced, requiring the use of a two-stage heating mode to meet the SCR temperature requirements.

[0057] In this embodiment, considering that the engine exhaust temperature decreases when the vehicle is on a long downhill slope, the SCR inlet temperature will also decrease. Furthermore, the SCR inlet temperature has the advantages of low fluctuation, ease of acquisition, and accurate values. By monitoring the changes in the SCR inlet temperature, accurate monitoring of long downhill road conditions can be achieved. Specific judgment strategies can be set as needed; this embodiment does not limit this. Several optional implementation methods will be illustrated later.

[0058] S13. If the vehicle is on a long downhill road, the engine will be controlled to enter the secondary heating mode. The heating power and fuel consumption rate of the secondary heating mode are greater than those of the primary heating mode.

[0059] Therefore, in this embodiment, the heating mode is further divided into a primary heating mode and a secondary heating mode. The secondary heating mode can quickly provide a higher exhaust temperature, and correspondingly, fuel consumption is also higher. Under normal circumstances, only the primary heating mode is needed to meet the SCR temperature requirements. When the vehicle is on a long downhill slope, the driver usually downshifts to increase engine speed and uses engine braking to reduce vehicle speed. At this time, fuel consumption is significantly reduced, and engine exhaust temperature is lowered, requiring the use of the secondary heating mode to meet the SCR temperature requirements. This embodiment utilizes the advantages of SCR inlet temperature: small fluctuations, easy acquisition, and accurate values. By monitoring changes in the SCR inlet temperature to determine whether the vehicle is on a long downhill slope, and using this as the basis for switching heating modes, it helps to achieve reasonable control of the heating mode, thereby controlling fuel consumption and improving economy while ensuring emission compliance.

[0060] As an optional implementation method, the steps for monitoring changes in the SCR inlet temperature include:

[0061] Real-time sampling of SCR inlet temperature;

[0062] Calculate the average value of a certain number of recently sampled SCR inlet temperatures, and use the average value rounded down or retained to a specified number of decimal places as the temperature reference value at the current moment;

[0063] If the difference between the current temperature reference value and the previous temperature reference value is greater than 0, then the change in the SCR inlet temperature at the current time is determined to be a temperature rise.

[0064] If the difference between the current temperature reference value and the previous temperature reference value is less than 0, then the change in the SCR inlet temperature at the current time is determined to be a temperature decrease.

[0065] If the difference between the current temperature reference value and the previous temperature reference value is 0, then the change in the SCR inlet temperature at the current time is determined to be that the temperature remains unchanged.

[0066] In this embodiment, the comparison object when monitoring the change of SCR inlet temperature is the temperature reference value between the current time and the previous time. The temperature reference value is the average value of the SCR inlet temperature at the current time and the previous few time points, rounded down or retained to a specified number of decimal places. For example, when a certain number of values ​​is 5, the average value of the first to fifth data points is calculated when the fifth data point is collected, the average value of the second to sixth data points is calculated when the sixth data point is collected, the average value of the third to seventh data points is calculated when the seventh data point is collected, and so on.

[0067] In this embodiment, the purpose of averaging is to reduce fluctuation interference. The current temperature reference value represents the overall temperature situation over a period of time, with the current time as the last time point. As the current time point moves forward, the difference in the temperature reference value can reflect the overall change in the SCR inlet temperature. Rounding the average value or retaining a specified number of decimal places controls accuracy and ignores the impact of systematic errors.

[0068] Thus, when the SCR inlet temperature tends to stabilize, the difference in temperature reference values ​​is equal to 0, corresponding to the conclusion that the temperature remains unchanged. When the SCR temperature rises significantly, the difference in temperature reference values ​​is greater than 0, corresponding to the conclusion that the temperature is rising. When the SCR temperature drops significantly, the difference in temperature reference values ​​is less than 0, corresponding to the conclusion that the temperature is falling. It can be understood that the change in temperature is a key criterion for judging long downhill road conditions.

[0069] As another optional implementation, the step of monitoring changes in the SCR inlet temperature includes:

[0070] Real-time sampling of SCR inlet temperature;

[0071] If the difference between the SCR inlet temperature at the current moment and the previous moment is greater than a, then the change in the SCR inlet temperature at the current moment is determined to be a temperature increase, and a is greater than 0.

[0072] If the difference between the current SCR inlet temperature and the previous time is less than -a, then the change in the current SCR inlet temperature is determined to be a temperature decrease.

[0073] If the absolute value of the difference between the SCR inlet temperature at the current moment and the previous moment is less than or equal to a, then the change in the SCR inlet temperature at the current moment is determined to be a constant temperature.

[0074] In this embodiment, the comparison object when monitoring the change of SCR inlet temperature is the SCR inlet temperature at the current moment and the previous moment. As the current moment moves forward, the difference in SCR inlet temperature can reflect the real-time change of SCR inlet temperature. To eliminate the influence of fluctuation interference and system errors, the difference is compared with ±a, where the value of a is set according to the actual situation.

[0075] Thus, when the SCR inlet temperature tends to stabilize, the difference between the SCR inlet temperatures is in the range of [-a, a], corresponding to the conclusion that the temperature remains unchanged. When the SCR temperature rises significantly, the difference between the temperature reference values ​​is greater than a, corresponding to the conclusion that the temperature is rising. When the SCR temperature drops significantly, the difference between the temperature reference values ​​is less than -a, corresponding to the conclusion that the temperature is falling.

[0076] Furthermore, in one embodiment, step S12 specifically includes:

[0077] If the current SCR inlet temperature is decreasing, the counter value is incremented by a first positive value, and the initial value of the counter value is 0.

[0078] If the current SCR inlet temperature is rising, then the counter value is reduced by the second positive value.

[0079] When the counter value is less than 0, reset the counter value to 0;

[0080] When the counter value is greater than the preset threshold, it is determined that the vehicle is on a long downhill road.

[0081] Figure 2 A logic diagram of a counter according to an embodiment of the present invention is shown.

[0082] Reference Figure 2In this embodiment, a counter is used for logical judgment. The counter value increases when the temperature decreases and decreases when the temperature drops. When the counter value is greater than a preset threshold, it indicates that the temperature has decreased more often than it has increased over a period of time, and the SCR inlet temperature has generally shown a downward trend during this period, thus concluding that the vehicle is on a long downhill road. When the temperature continues to rise, the counter value may become negative. To avoid affecting subsequent judgments, the counter value needs to be reset to 0.

[0083] Figure 3 A schematic diagram of the counter value and SCR inlet temperature in one embodiment of the present invention is shown; Figure 4 A schematic diagram showing the counter judgment result and SCR inlet temperature in one embodiment of the present invention is shown.

[0084] This algorithm was then applied to actual road conditions for the entire vehicle. (Refer to...) Figure 3 When the vehicle is on a long downhill slope, the SCR inlet temperature drops significantly. At this point, the counter value begins to accumulate; the longer the temperature drop continues, the larger the counter value becomes. (Refer to...) Figure 4 When the counter value is greater than the preset threshold, it is determined that the vehicle is on a long downhill road (the judgment result is output as 1).

[0085] Furthermore, in one embodiment, step S12 further includes:

[0086] If the current SCR inlet temperature remains constant and the duration of this constant temperature is less than a preset duration, then the counter value remains unchanged.

[0087] If the current SCR inlet temperature remains constant and the duration of this constant temperature is greater than or equal to a preset duration, then the counter value will be reset to 0.

[0088] In this embodiment, for cases where the temperature remains constant, it is necessary to further determine the duration of this constant temperature. When the temperature remains constant for a short period, the counter value is kept constant, and the previous counting results are retained. When the temperature remains constant for a long period, the counter value needs to be reset to 0 to clear the previous counting results, thereby avoiding the cumulative effect on the monitoring results and improving the reliability of the monitoring results. For example, when a vehicle is traveling on a relatively flat road, if the counter value is not reset to 0, the accumulation of counter values ​​caused by occasional temperature drops may be misjudged as a long downhill road condition. For example, the sampling interval for the SCR inlet temperature is 0.2s, and the preset duration is 3s. When the temperature remains constant for 15 or more consecutive time intervals, the counter value is reset to 0.

[0089] Furthermore, in one embodiment, the second positive value is greater than the first positive value.

[0090] Exhaust gas aftertreatment systems typically include a catalytic oxidizer (DOC), a particulate filter (DPF), and a selective oxidation-reduction (SCR). Due to the distance between the engine outlet and the SCR inlet, and the heat absorption and insulation effects of the DOC and DPF, there is a delay in the temperature rise at the SCR inlet.

[0091] In this embodiment, the second positive value is greater than the first positive value, meaning the decrease in the counter value is greater than the increase. When a temperature rise is detected, more temperature decreases are required for the counter value to reach the preset threshold, thus increasing the judgment requirement and ensuring the accuracy of the monitoring results. For example, the first positive value is set to 1, and the second positive value is set to 4.

[0092] As another optional implementation, step S12 specifically includes:

[0093] If the SCR inlet temperature changes consistently by a predetermined number of time intervals, indicating a temperature decrease, then the vehicle is determined to be on a long downhill slope.

[0094] When using a counter for logical judgment, even if there are a few moments of temperature increase, it can be compensated by a larger number of moments of temperature decrease, thereby reaching a preset threshold and concluding that the vehicle is on a long downhill road. In this embodiment, the judgment condition for a long downhill road is more stringent than that of a counter. After detecting moments of temperature increase, it is necessary to re-accumulate moments of temperature decrease. Only when the change in SCR inlet temperature for a consecutive preset number of moments is consistently a decrease is it confirmed that the vehicle is on a long downhill road. The results obtained are more accurate, but there is a possibility of missed judgments.

[0095] Figure 5 A flowchart illustrating the SCR thermal management method in another embodiment of the present invention is shown.

[0096] Reference Figure 5 In one embodiment, the SCR thermal management method further includes:

[0097] When the engine is in the first-level heating mode, monitor whether the SCR bed temperature is within the preset temperature range.

[0098] If the SCR bed temperature is within the preset temperature range, the engine will be controlled to enter the secondary heating mode.

[0099] In this embodiment, both SCR bed temperature and long downhill road conditions are used as the basis for judgment. When either condition needs to be met, the engine is controlled to enter the secondary heating mode.

[0100] Secondly, embodiments of the present invention also provide an SCR thermal management device.

[0101] In one embodiment, the SCR thermal management device includes:

[0102] The first monitoring module is used to monitor the changes in SCR inlet temperature when the engine is in the first-stage heating mode.

[0103] The second monitoring module is used to monitor whether the vehicle is on a long downhill road condition based on the changes in the SCR inlet temperature.

[0104] The execution module is used to control the engine to enter a secondary heating mode if the vehicle is on a long downhill road. The heating power and fuel consumption rate of the secondary heating mode are greater than those of the primary heating mode.

[0105] Furthermore, in one embodiment, the first monitoring module is used for:

[0106] Real-time sampling of SCR inlet temperature;

[0107] Calculate the average value of a certain number of recently sampled SCR inlet temperatures, and use the average value rounded down or retained to a specified number of decimal places as the temperature reference value at the current moment;

[0108] If the difference between the current temperature reference value and the previous temperature reference value is greater than 0, then the change in the SCR inlet temperature at the current time is determined to be a temperature rise.

[0109] If the difference between the current temperature reference value and the previous temperature reference value is less than 0, then the change in the SCR inlet temperature at the current time is determined to be a temperature decrease.

[0110] If the difference between the current temperature reference value and the previous temperature reference value is 0, then the change in the SCR inlet temperature at the current time is determined to be that the temperature remains unchanged.

[0111] Furthermore, in one embodiment, the first monitoring module is used for:

[0112] Real-time sampling of SCR inlet temperature;

[0113] If the difference between the SCR inlet temperature at the current moment and the previous moment is greater than a, then the change in the SCR inlet temperature at the current moment is determined to be a temperature increase, and a is greater than 0.

[0114] If the difference between the current SCR inlet temperature and the previous time is less than -a, then the change in the current SCR inlet temperature is determined to be a temperature decrease.

[0115] If the absolute value of the difference between the SCR inlet temperature at the current moment and the previous moment is less than or equal to a, then the change in the SCR inlet temperature at the current moment is determined to be a constant temperature.

[0116] Furthermore, in one embodiment, the second monitoring module is used for:

[0117] If the current SCR inlet temperature is decreasing, the counter value is incremented by a first positive value, and the initial value of the counter value is 0.

[0118] If the current SCR inlet temperature is rising, then the counter value is reduced by the second positive value.

[0119] When the counter value is less than 0, reset the counter value to 0;

[0120] When the counter value is greater than the preset threshold, it is determined that the vehicle is on a long downhill road.

[0121] Furthermore, in one embodiment, the second monitoring module is also used for:

[0122] If the current SCR inlet temperature remains constant and the duration of this constant temperature is less than a preset duration, then the counter value remains unchanged.

[0123] If the current SCR inlet temperature remains constant and the duration of this constant temperature is greater than or equal to a preset duration, then the counter value will be reset to 0.

[0124] Furthermore, in one embodiment, the second positive value is greater than the first positive value.

[0125] Furthermore, in one embodiment, the second monitoring module is used for:

[0126] If the SCR inlet temperature changes consistently by a predetermined number of time intervals, indicating a temperature decrease, then the vehicle is determined to be on a long downhill slope.

[0127] Furthermore, in one embodiment, the SCR thermal management device further includes a third monitoring module;

[0128] The third monitoring module is used to monitor whether the SCR bed temperature is within the preset temperature range when the engine is in the first-level heating mode.

[0129] The execution module is also used to control the engine to enter the secondary heating mode if the SCR bed temperature is within the preset temperature range.

[0130] The functions of each module in the SCR thermal management device correspond to the steps in the SCR thermal management method embodiment, and their functions and implementation processes will not be described in detail here.

[0131] Thirdly, embodiments of the present invention provide an SCR thermal management device, which can be a device with data processing capabilities such as a personal computer (PC), a laptop computer, or a server.

[0132] Figure 6 A schematic diagram of the hardware structure of an SCR thermal management device according to an embodiment of the present invention is shown.

[0133] Reference Figure 6 In this embodiment of the invention, the SCR thermal management device may include a processor 1001 (e.g., a Central Processing Unit, CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. The communication bus 1002 is used to enable communication between these components; the user interface 1003 may include a display screen or an input unit such as a keyboard; the network interface 1004 may optionally include a standard wired interface or a wireless interface (e.g., Wireless Fidelity, Wi-Fi); the memory 1005 may be high-speed random access memory (RAM) or stable memory (non-volatile memory), such as a disk storage device. Alternatively, the memory 1005 may also be a storage device independent of the aforementioned processor 1001. Those skilled in the art will understand that… Figure 6 The hardware structure shown does not constitute a limitation of the invention and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0134] Continue to refer to Figure 6 , Figure 6 The memory 1005, which serves as a computer storage medium, may include an operating system, a network communication module, a user interface module, and an SCR thermal management program. The processor 1001 can call the SCR thermal management program stored in the memory 1005 and execute the SCR thermal management method provided in this embodiment of the invention.

[0135] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or system. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or system that includes that element.

[0136] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0137] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes several instructions to cause a terminal device to execute the methods described in the various embodiments of the present invention.

[0138] The above are merely preferred embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A thermal management method for SCR (Self-Resistant CR) systems, characterized in that: The SCR thermal management method includes: When the engine is in primary heating mode, monitor the changes in SCR inlet temperature. Monitor whether the vehicle is on a long downhill road condition based on the changes in SCR inlet temperature; If the vehicle is on the long downhill road, the engine is controlled to enter the secondary heating mode, wherein the heating power and fuel consumption rate of the secondary heating mode are greater than those of the primary heating mode. The steps for monitoring changes in the SCR inlet temperature include: Real-time sampling of SCR inlet temperature; Calculate the average value of a certain number of recently sampled SCR inlet temperatures, and use the average value after rounding or retaining a specified number of decimal places as the temperature reference value at the current moment; If the difference between the current temperature reference value and the previous temperature reference value is greater than 0, then the change in the SCR inlet temperature at the current time is determined to be a temperature rise. If the difference between the current temperature reference value and the previous temperature reference value is less than 0, then the change in the SCR inlet temperature at the current time is determined to be a temperature decrease. If the difference between the current temperature reference value and the previous temperature reference value is equal to 0, then the change in the SCR inlet temperature at the current time is determined to be that the temperature remains unchanged. The steps for monitoring whether a vehicle is on a long downhill slope based on changes in SCR inlet temperature include: If the current SCR inlet temperature is decreasing, the counter value is incremented by a first positive value, and the initial value of the counter value is 0. If the current SCR inlet temperature is rising, then the counter value is reduced by a second positive value; The second positive value is greater than the first positive value; When the counter value is less than 0, the counter value is reset to 0; When the counter value is greater than a preset threshold, it is determined that the vehicle is on a long downhill road. The step of monitoring whether the vehicle is on a long downhill road condition based on the change of SCR inlet temperature also includes: If the current SCR inlet temperature remains unchanged and the duration of this unchanged temperature is less than a preset duration, then the counter value remains unchanged. If the current SCR inlet temperature remains constant and the duration of this constant temperature is greater than or equal to a preset duration, then the counter value is reset to 0.

2. The SCR thermal management method as described in claim 1, characterized in that, The steps for monitoring changes in the SCR inlet temperature include: Real-time sampling of SCR inlet temperature; If the difference between the SCR inlet temperature at the current moment and the previous moment is greater than a, then the change in the SCR inlet temperature at the current moment is determined to be a temperature increase, and a is greater than 0. If the difference between the current SCR inlet temperature and the previous time is less than -a, then the change in the current SCR inlet temperature is determined to be a temperature decrease. If the absolute value of the difference between the SCR inlet temperature at the current moment and the previous moment is less than or equal to a, then the change in the SCR inlet temperature at the current moment is determined to be a constant temperature.

3. The SCR thermal management method as described in claim 1 or 2, characterized in that, The steps for monitoring whether a vehicle is on a long downhill slope based on changes in SCR inlet temperature include: If the SCR inlet temperature changes consistently by a predetermined number of time intervals, indicating a temperature decrease, then the vehicle is determined to be on a long downhill slope.

4. The SCR thermal management method as described in claim 1, characterized in that, The SCR thermal management method further includes: When the engine is in the first-level heating mode, monitor whether the SCR bed temperature is within the preset temperature range. If the SCR bed temperature is within the preset temperature range, the engine is controlled to enter the secondary heating mode.

5. An SCR thermal management device, characterized in that, The SCR thermal management device includes: The first monitoring module is used to monitor the changes in SCR inlet temperature when the engine is in the first-stage heating mode. The second monitoring module is used to monitor whether the vehicle is on a long downhill road condition based on the changes in the SCR inlet temperature. An execution module is configured to control the engine to enter a secondary heating mode if the vehicle is on the long downhill road condition, wherein the heating power and fuel consumption rate of the secondary heating mode are greater than those of the primary heating mode. The first monitoring module is also used for: Real-time sampling of SCR inlet temperature; Calculate the average value of a certain number of recently sampled SCR inlet temperatures, and use the average value after rounding or retaining a specified number of decimal places as the temperature reference value at the current moment; If the difference between the current temperature reference value and the previous temperature reference value is greater than 0, then the change in the SCR inlet temperature at the current time is determined to be a temperature rise. If the difference between the current temperature reference value and the previous temperature reference value is less than 0, then the change in the SCR inlet temperature at the current time is determined to be a temperature decrease. If the difference between the current temperature reference value and the previous temperature reference value is equal to 0, then the change in the SCR inlet temperature at the current time is determined to be that the temperature remains unchanged. The second monitoring module is also used for: If the current SCR inlet temperature is decreasing, the counter value is incremented by a first positive value, and the initial value of the counter value is 0. If the current SCR inlet temperature is rising, then the counter value is reduced by a second positive value; The second positive value is greater than the first positive value; When the counter value is less than 0, the counter value is reset to 0; When the counter value is greater than a preset threshold, it is determined that the vehicle is on a long downhill road. The second monitoring module is also used for: If the current SCR inlet temperature remains unchanged and the duration of this unchanged temperature is less than a preset duration, then the counter value remains unchanged. If the current SCR inlet temperature remains constant and the duration of this constant temperature is greater than or equal to a preset duration, then the counter value is reset to 0.

6. An SCR thermal management device, characterized in that, The SCR thermal management device includes a processor, a memory, and an SCR thermal management program stored in the memory and executable by the processor, wherein when the SCR thermal management program is executed by the processor, it implements the steps of the SCR thermal management method as described in any one of claims 1 to 4.

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