Urea status monitoring method, device, vehicle and computer storage medium

Abstract

The present invention discloses a urea status monitoring method, a urea status monitoring device, a vehicle, and a computer storage medium. The urea status monitoring method includes: dividing the urea into multiple temperature intervals and obtaining the cumulative time that the urea temperature is within each temperature interval; determining a base temperature interval and calculating a correction coefficient for the cumulative time in each temperature interval based on the exhaust particle value of the urea in each temperature interval and the exhaust particle value of the urea in the base temperature interval; calculating the cumulative time of urea at high temperature based on the cumulative time and the correction coefficient; comparing the cumulative time of urea at high temperature with a threshold; and issuing a prompt signal if the cumulative time of urea at high temperature exceeds the threshold. The urea status monitoring method of the present invention can monitor the urea status and remind the user to promptly replace degraded urea.

Description

Technical Field

[0001] The present invention relates to the technical field of engines, and in particular to a urea status monitoring method, a urea status monitoring device, a vehicle, and a computer storage medium. Background Art

[0002] This section merely provides background information related to the present disclosure and is not necessarily prior art.

[0003] In order to meet the emission requirements of NOx (nitrogen oxides) in diesel engine exhaust, the diesel engine in the related art is equipped with a urea tank for storing urea. Urea is injected into the exhaust gas, and the ammonia produced by the thermal decomposition of urea reacts with NOx to significantly reduce NOx emissions, thereby meeting the emission requirements of NOx in diesel engine exhaust.

[0004] If urea is not used for a long time in a high temperature environment, it will cause the urea to deteriorate, resulting in excessive particulate matter in the exhaust, which in turn causes the diesel engine exhaust to fail to meet emission requirements. Therefore, when urea is not used for a long time in a high temperature environment, it needs to be replaced.

[0005] However, the related art lacks a method for monitoring the state of urea, which makes it difficult for users to replace deteriorated urea in a timely manner. Summary of the Invention

[0006] The object of the present invention is to at least solve the problem of the lack of a method for monitoring the state of urea in the related art. This object is achieved by the following technical solutions:

[0007] A first aspect of the present invention provides a urea status monitoring method, comprising:

[0008] Dividing the temperature into multiple intervals, and obtaining the accumulated time that the temperature of urea is in each of the temperature intervals;

[0009] Determining a basic temperature interval, and calculating a correction coefficient for the accumulated time in each temperature interval based on the exhaust particle value of urea in each temperature interval and the exhaust particle value of urea in the basic temperature interval;

[0010] Calculating the urea high temperature cumulative time according to the cumulative time and the correction coefficient;

[0011] Comparing the urea high temperature cumulative time and the threshold;

[0012] According to the urea high temperature accumulated time being greater than the threshold, a prompt signal is issued.

[0013] The urea status monitoring method of the present invention divides the urea into multiple temperature intervals, obtains the cumulative time that the urea temperature is within each temperature interval, and corrects the cumulative time using a correction coefficient to obtain the cumulative urea high-temperature time that can reflect the degree of urea degradation. By comparing the cumulative urea high-temperature time with a threshold, it is determined whether the urea needs to be replaced, thereby achieving urea status monitoring. When the urea needs to be replaced, the urea status monitoring method of the present invention can prompt the user.

[0014] In some embodiments, the basic temperature interval is selected from one of the plurality of temperature intervals, and the correction coefficient of the accumulated time in each temperature interval is a ratio of the exhaust particle value of urea in each temperature interval to the exhaust particle value of urea in the basic temperature interval.

[0015] In some embodiments, before the step of comparing the urea high temperature accumulated time with the threshold, the urea status monitoring method further includes:

[0016] The threshold value is obtained according to the basic temperature range and the regulatory limit value of the exhaust particulate matter value.

[0017] In some embodiments, the step of obtaining the threshold value based on the basic temperature range and the regulatory limit of the exhaust particulate matter value includes:

[0018] Selecting a cumulative time array according to a basic temperature range, wherein the cumulative time array is preset and the selected cumulative time array is used to represent: a mapping relationship between the number of exhaust particles and the cumulative time within the basic temperature range;

[0019] The threshold value is obtained according to the regulatory limit value of the exhaust particle value and the accumulated time array.

[0020] In some embodiments, the step of obtaining the threshold value based on the regulatory limit of the exhaust particulate matter value and the accumulated time array includes:

[0021] querying the selected cumulative time array to obtain a regulatory cumulative time corresponding to a regulatory limit of the exhaust particulate matter value;

[0022] The regulation accumulated time is corrected according to a threshold correction coefficient to obtain the threshold, wherein the threshold correction coefficient is greater than 0 and less than 1.

[0023] In some embodiments, the step of dividing the temperature into a plurality of intervals and obtaining the accumulated time that the temperature of urea is within each of the temperature intervals includes:

[0024] Divide into multiple temperature ranges;

[0025] Determine whether urea is added;

[0026] According to the absence of urea addition behavior, the accumulated time during which the temperature of urea is within each of the temperature intervals is obtained.

[0027] In some embodiments, the step of determining whether urea addition occurs includes:

[0028] Get the urea liquid level change rate per unit time;

[0029] According to the liquid level change rate being greater than 0, it is determined that urea addition occurs;

[0030] According to the liquid level change rate being less than or equal to 0, it is determined that no urea addition behavior occurs.

[0031] A second aspect of the present invention provides a urea status monitoring device, comprising:

[0032] An accumulation module, used for dividing the temperature into a plurality of temperature intervals and obtaining the accumulated time that the temperature of the urea is in each of the temperature intervals;

[0033] a correction coefficient calculation module, configured to determine a basic temperature interval, and calculate a correction coefficient for the accumulated time in each temperature interval based on the exhaust particle value of urea in each temperature interval and the exhaust particle value of urea in the basic temperature interval;

[0034] a urea high temperature cumulative time calculation module, configured to calculate the urea high temperature cumulative time based on the cumulative time and the correction coefficient;

[0035] A comparison module, used to compare the urea high temperature cumulative time and the threshold;

[0036] The prompt module is used to send a prompt signal according to the accumulated time of high temperature of urea being greater than the threshold value, and the prompt signal is used to instruct the terminal to send a urea replacement reminder message.

[0037] A third aspect of the present invention provides a vehicle comprising a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the urea status monitoring method described in the first aspect when executing the computer program.

[0038] A third aspect of the present invention provides a computer storage medium, characterized in that computer-readable instructions are stored on the computer storage medium, and when the computer-readable instructions are read by one or more processors, the one or more processors execute the urea status monitoring method described in the first aspect above. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present invention. The same reference numerals are used throughout the accompanying drawings to denote the same components. In the accompanying drawings:

[0040] Figure 1 Flowchart of a urea status monitoring method according to an embodiment of the present invention;

[0041] Figure 2 Schematic diagram of a urea status monitoring device according to an embodiment of the present invention;

[0042] Figure 3 This is a graph showing the relationship between the engine's cumulative running time and the urea level. DETAILED DESCRIPTION

[0043] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0044] It should be understood that the terms used herein are for the purpose of describing specific example embodiments only and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "comprise", "include", "contain" and "have" are inclusive and therefore specify the presence of stated features, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the specific order described or illustrated, unless the order of execution is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0045] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates otherwise, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0046] For ease of description, spatially relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figures, such as "inside," "outside," "inside," "outside," "below," "beneath," "above," and the like. Such spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is flipped, an element described as "below" or "below" another element or feature would then be oriented as "above" or "above" another element or feature. Thus, the example term "below" can include both above and below orientations. The device may be otherwise oriented (rotated 90 degrees or in other orientations) and the spatially relative descriptors used herein are interpreted accordingly.

[0047] In order to meet the emission requirements of NOx (nitrogen oxides) in diesel engine exhaust, the diesel engine in the related art is equipped with a urea tank for storing urea. Urea is injected into the exhaust gas, and the ammonia produced by the thermal decomposition of urea reacts with NOx to significantly reduce NOx emissions, thereby meeting the emission requirements of NOx in diesel engine exhaust.

[0048] Prolonged periods of unused urea in high-temperature environments can lead to urea degradation. Degraded urea significantly increases both the free ammonia concentration and electrical conductivity, reducing urea hydrolysis efficiency. This leads to a significant increase in the number of particulates in the exhaust, causing the amount of particulate matter in the exhaust to exceed standards, and ultimately causing diesel engine exhaust to fail to meet emission requirements. Therefore, when urea is left unused for an extended period in high-temperature environments, it needs to be replaced.

[0049] However, the related art lacks a method for monitoring the status of urea, which makes it difficult for users to know whether the urea can be used normally, and thus makes it difficult for users to replace deteriorated urea in a timely manner.

[0050] In order to at least solve the problem that there is a lack of a method for monitoring the state of urea in the related art.

[0051] An embodiment of the present invention provides a urea status monitoring method, which can monitor the urea status and remind the user to replace deteriorated urea in time.

[0052] The following describes a urea status monitoring method according to an embodiment of the present invention with reference to the accompanying drawings.

[0053] like Figure 1 As shown, the urea status monitoring method according to an embodiment of the present invention includes:

[0054] S100, dividing the temperature into multiple intervals, and obtaining the accumulated time that the temperature of urea is in each temperature interval;

[0055] S200 , determining a basic temperature interval, and calculating a correction coefficient for the accumulated time in each temperature interval based on the exhaust particle value of urea in each temperature interval and the exhaust particle value of urea in the basic temperature interval;

[0056] S300, calculating the urea high temperature cumulative time based on the cumulative time and correction coefficient of each temperature interval;

[0057] S400, comparing the urea high temperature cumulative time and threshold;

[0058] S500: Sending a warning signal based on the fact that the accumulated time of urea high temperature is greater than a threshold.

[0059] Urea degradation refers to changes in urea's chemical properties during storage and use due to various reasons, which can affect the effectiveness and safety of urea. Urea deteriorates to varying degrees at different temperatures, and the degree of urea degradation is positively correlated with temperature; that is, the higher the temperature, the greater the degree of urea degradation.

[0060] S100: Divide the temperature into multiple intervals, and obtain the accumulated time that the temperature of urea is in each temperature interval.

[0061] The degree of degradation of urea in each temperature range is different, and the cumulative time that the temperature of urea is in each temperature range can represent the degree of degradation of urea.

[0062] The degree of degradation of urea at each temperature is different, and the accumulated time that the temperature of urea is within each temperature interval is obtained to reduce the amount of calculation of the accumulated time.

[0063] Preferably, the temperature is greater than 40° C. and less than or equal to 70° C. as the total temperature interval, and the total temperature interval is divided to form a plurality of temperature intervals.

[0064] When the temperature is less than or equal to 40°C, the degree of urea degradation is low, and the probability of the urea temperature in the diesel engine's urea tank exceeding 70°C is low. Therefore, dividing the total temperature range into multiple temperature intervals, with temperatures greater than 40°C and less than or equal to 70°C, can reduce the length of the total temperature range and thus reduce the amount of computation.

[0065] As some examples of dividing the temperature intervals, each temperature interval has an interval length of 10° C. For example, the first temperature interval is greater than 40° C. and less than or equal to 50° C., the second temperature interval is greater than 50° C. and less than or equal to 60° C., and the third temperature interval is greater than 60° C. and less than or equal to 70° C.

[0066] As another example of dividing the temperature intervals, the length of each temperature interval is 5° C. For example, the first temperature interval is greater than 40° C. and less than or equal to 45° C., the second temperature interval is greater than 45° C. and less than or equal to 50° C., the third temperature interval is greater than 50° C. and less than or equal to 55° C., the fourth temperature interval is greater than 55° C. and less than or equal to 60° C., the fifth temperature interval is greater than 60° C. and less than or equal to 65° C., and the sixth temperature interval is greater than 65° C. and less than or equal to 70° C.

[0067] S200 : Determine a basic temperature interval, and calculate a correction coefficient for the accumulated time in each temperature interval based on the exhaust particle value of urea in each temperature interval and the exhaust particle value of urea in the basic temperature interval.

[0068] Since the degree of urea degradation varies in each temperature interval, a base temperature interval needs to be determined. A correction coefficient is calculated based on the exhaust particle value of urea in the base temperature interval and the exhaust particle value of urea in each temperature interval. The correction coefficient is used to correct the accumulated time that the urea temperature is in each temperature interval.

[0069] The urea exhaust particulate matter value for each temperature range refers to the value of exhaust particulate matter after urea is injected into the exhaust gas while maintaining the urea in each temperature range. For example, the urea exhaust particulate matter value for the first temperature range refers to the value of exhaust particulate matter after urea is injected into the exhaust gas while maintaining the urea in the first temperature range.

[0070] The exhaust particulate matter value of urea in the basic temperature range refers to the value of the exhaust particulate matter after urea is injected into the exhaust when the urea is maintained in the basic temperature range.

[0071] In some specific embodiments, the basic temperature interval is selected from one of a plurality of temperature intervals, and the correction coefficient of the accumulated time of each temperature interval is the ratio of the exhaust particle value of urea in each temperature interval to the exhaust particle value of urea in the basic temperature interval.

[0072] The basic temperature interval is selected from one of the multiple temperature intervals, which can reduce the complexity of the method of this embodiment and further reduce the amount of calculation.

[0073] Preferably, each temperature interval is 10°C long. The first temperature interval is greater than 40°C and less than or equal to 50°C, the second temperature interval is greater than 50°C and less than or equal to 60°C, and the third temperature interval is greater than 60°C and less than or equal to 70°C. The temperature interval greater than 40°C and less than or equal to 50°C is used as the base temperature interval. In a urea tank, the urea temperature is greater than 40°C and less than or equal to 50°C for a longer period of time. Therefore, using the temperature interval greater than 40°C and less than or equal to 50°C as the base temperature interval can improve accuracy.

[0074] In some optional embodiments, the interval length of each temperature interval is 10°C, the first temperature interval is greater than 40°C and less than or equal to 50°C, the second temperature interval is greater than 50°C and less than or equal to 60°C, and the third temperature interval is greater than 60°C and less than or equal to 70°C, with the temperature interval greater than 40°C and less than or equal to 50°C as the basic temperature interval.

[0075] Since the first temperature interval is the basic temperature interval, the correction coefficient k1 of the first temperature interval is 1. Alternatively, the correction coefficient of the accumulated time in the first temperature interval is calculated by the following formula:

[0076] k1=(N_40+N_50) / (N_40+N_50)

[0077] Wherein, N_40 is the value of particulate matter in the exhaust after urea is injected into the exhaust when the urea temperature is maintained at 40°C. N_50 is the value of particulate matter in the exhaust after urea is injected into the exhaust when the urea temperature is maintained at 50°C.

[0078] The correction coefficient k2 of the cumulative time in the second temperature interval is calculated by the following formula:

[0079] K2=(N_50+N_60) / (N_40+N_50)

[0080] Among them, N_60 is the value of particulate matter in the exhaust after urea is injected into the exhaust when the urea is maintained at 60°C.

[0081] The correction coefficient k3 of the cumulative time in the third temperature interval is calculated by the following formula:

[0082] K3=(N_60+N_70) / (N_40+N_50)

[0083] Among them, N_70 is the value of particulate matter in the exhaust after urea is injected into the exhaust when the urea is maintained at 70°C.

[0084] The values ​​of N_40, N_50, N_60 and N_70 may be preset, and the specific values ​​of N_40, N_50, N_60 and N_70 may be determined through experiments.

[0085] Therefore, according to this embodiment, the correction coefficient of the cumulative time in each temperature zone can be calculated.

[0086] S300, calculating the urea high temperature cumulative time based on the cumulative time and the correction coefficient;

[0087] The degree of urea degradation can be characterized by the accumulated time of urea at high temperature.

[0088] In some optional embodiments, the length of each temperature interval is 10°C, the first temperature interval is greater than 40°C and less than or equal to 50°C, the second temperature interval is greater than 50°C and less than or equal to 60°C, and the third temperature interval is greater than 60°C and less than or equal to 70°C, with the temperature interval greater than 40°C and less than or equal to 50°C being the base temperature interval. The urea high temperature cumulative time T_toal is calculated using the following formula:

[0089] T_toal=k1*T1+k2*T2+k3*T3

[0090] Among them, k1 is the correction coefficient of the accumulated time in the first temperature interval, T1 is the accumulated time in the first temperature interval, k2 is the correction coefficient of the accumulated time in the second temperature interval, T2 is the accumulated time in the second temperature interval, k3 is the correction coefficient of the accumulated time in the third temperature interval, and T3 is the accumulated time in the third temperature interval.

[0091] S400: Compare the urea high temperature cumulative time and the threshold.

[0092] By comparing the urea high temperature cumulative time and the threshold, a comparison result can be obtained, so that subsequent judgment can be made based on the comparison result.

[0093] The threshold value may be a preset value or a value obtained through further steps.

[0094] In some optional embodiments, before the step of comparing the urea high temperature accumulated time with the threshold in S400, the urea status monitoring method further includes:

[0095] The threshold values ​​are obtained based on the regulatory limits for the base temperature range and exhaust particulate values.

[0096] Obtaining the threshold value according to the basic temperature range can improve the accuracy of the threshold value, thereby improving the accuracy of the urea status monitoring method of this embodiment.

[0097] Furthermore, the step of obtaining a threshold value based on the basic temperature range and the regulatory limit of the exhaust particulate matter value includes:

[0098] Selecting a cumulative time array according to a basic temperature range, the cumulative time array being preset, and the selected cumulative time array is used to represent: a mapping relationship between the number of exhaust particles and the cumulative time within the basic temperature range;

[0099] The threshold value is obtained based on the regulatory limit of the exhaust particle value and the accumulation time array.

[0100] It should be noted that there are multiple accumulated time arrays, and each accumulated time array can reflect: a mapping relationship between the number of exhaust particles and accumulated time within a corresponding temperature range.

[0101] The cumulative time array can be obtained through experimental fitting.

[0102] Urea degrades to varying degrees in each temperature range. Therefore, the mapping between exhaust particle count and accumulated time differs in each temperature range. In other words, the accumulated time array is different in each temperature range. The accumulated time array is selected based on the base temperature range so that it correctly represents the mapping between exhaust particle count and accumulated time within the base temperature range.

[0103] Optionally, the accumulated time array is a two-dimensional array, so that a mapping relationship between the number of particles in the exhaust and the accumulated time can be represented by a straight line or a curve.

[0104] The threshold value is obtained according to the regulatory limit of the exhaust particle value and the accumulation time array.

[0105] Furthermore, the accumulated time array is selected to represent the mapping relationship between the number of exhaust particles and the accumulated time when the urea is at the average temperature of the basic temperature range, so as to reduce the difficulty of fitting the accumulated time array.

[0106] As some examples, when the basic temperature interval is 40°C and less than or equal to 50°C, the temperature average of the basic temperature interval is 45°C. The selected accumulated time array is used to represent the mapping relationship between the number of exhaust particles and the accumulated time when urea is at 45°C.

[0107] Furthermore, the step of obtaining a threshold value based on the regulatory limit of the exhaust particulate value and the accumulated time array includes:

[0108] Query the selected cumulative time array to obtain the regulatory cumulative time corresponding to the regulatory limit of the exhaust particulate value;

[0109] The regulation accumulated time is corrected according to the threshold correction coefficient to obtain a threshold value, wherein the threshold correction coefficient is greater than 0 and less than 1.

[0110] As some examples, the threshold correction factor is 0.8.

[0111] The regulation cumulative time is corrected according to the threshold correction coefficient so that the threshold is less than the regulation cumulative time, thereby providing an early reminder to replace urea and reducing the probability that the exhaust particulate value exceeds the regulation limit.

[0112] S500: Sending a warning signal based on the fact that the accumulated time of urea high temperature is greater than a threshold.

[0113] The prompt signal is used to instruct the terminal to issue a urea replacement reminder. If the accumulated urea high temperature time exceeds the threshold, it indicates that the urea has deteriorated seriously and needs to be replaced. The prompt signal is issued to inform the user through the terminal that urea needs to be replaced.

[0114] The terminal may be a physical terminal, for example, the terminal is a dashboard of a vehicle. In response to receiving the prompt signal, the dashboard displays words or icons prompting to replace urea, so as to send a urea replacement reminder message.

[0115] The terminal may also be a virtual terminal, for example, the terminal is a mobile phone client, which can receive a prompt signal through the vehicle networking system. In response to receiving the prompt signal, the mobile phone client displays information prompting to replace urea, thereby issuing a urea replacement reminder message.

[0116] The urea status monitoring method of an embodiment of the present invention divides the urea into multiple temperature intervals, obtains the cumulative time that the urea temperature is within each temperature interval, and corrects the cumulative time using a correction coefficient to obtain the cumulative urea high-temperature time that can reflect the degree of urea degradation. By comparing the cumulative urea high-temperature time with a threshold, it is determined whether the urea needs to be replaced, thereby achieving urea status monitoring. When the urea needs to be replaced, the urea status monitoring method of the embodiment of the present invention can prompt the user.

[0117] In some embodiments, the step of dividing the temperature into multiple intervals and obtaining the accumulated time that the temperature of urea is in each temperature interval includes:

[0118] Divide into multiple temperature ranges;

[0119] Determine whether urea is added;

[0120] Based on the absence of urea addition behavior, the accumulated time that the urea temperature is in each temperature interval is obtained.

[0121] According to the absence of urea addition behavior, the accumulated time that the urea temperature is in each temperature interval is obtained, which can improve the accuracy of the obtained data.

[0122] like Figure 3 As shown, the urea level increases in the P1-P2 and P3-P4 sections, indicating that urea was added during the t1-t2 and t3-t4 periods. The urea level decreases in the P2-P3 section, indicating that no urea was added during the t2-t3 period.

[0123] like Figure 3 As shown, in some embodiments, the step of determining whether urea addition occurs includes:

[0124] Get the urea liquid level change rate per unit time;

[0125] According to the liquid level change rate being greater than 0, it is judged that urea is added;

[0126] Since the liquid level change rate is less than 0 and equal to 0, it is determined that no urea addition behavior occurs.

[0127] The urea addition behavior is judged by the liquid level change rate, so that whether the urea addition behavior occurs can be accurately determined.

[0128] It should be understood that, although the various steps in the flowcharts involved in the various embodiments described above are displayed in sequence according to the instructions of the arrows, these steps are not necessarily executed in sequence in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and these steps can be executed in other orders. Moreover, at least a portion of the steps in the flowcharts involved in the various embodiments described above can include multiple steps or multiple stages, and these steps or stages are not necessarily executed and completed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a portion of steps or stages in other steps.

[0129] Based on the same inventive concept, embodiments of the present application further provide a urea status monitoring device for implementing the aforementioned urea status monitoring method. The solution provided by this device is similar to the solution described in the aforementioned method. Therefore, the specific limitations of one or more urea status monitoring device embodiments provided below can be found in the above-described limitations of the urea status monitoring method and will not be further elaborated here.

[0130] like Figure 2 As shown, the urea status monitoring device according to the embodiment of the present invention includes:

[0131] The accumulation module is used to divide the temperature into multiple intervals and obtain the accumulated time that the urea temperature is in each temperature interval;

[0132] A correction coefficient calculation module is used to determine a basic temperature interval and calculate a correction coefficient for the accumulated time in each temperature interval based on the exhaust particle value of urea in each temperature interval and the exhaust particle value of urea in the basic temperature interval;

[0133] Urea high temperature cumulative time calculation module, used to calculate the urea high temperature cumulative time based on the cumulative time and correction coefficient;

[0134] Comparison module, used to compare urea high temperature cumulative time and threshold;

[0135] The prompt module is used to send a prompt signal according to the accumulated time of urea high temperature being greater than a threshold value. The prompt signal is used to instruct the terminal to send a urea replacement reminder message.

[0136] In some embodiments, the basic temperature interval is selected from one of the plurality of temperature intervals, and the correction coefficient of the accumulated time in each temperature interval is a ratio of the exhaust particle value of urea in each temperature interval to the exhaust particle value of urea in the basic temperature interval.

[0137] In some embodiments, the urea status monitoring device further includes:

[0138] A threshold acquisition module is used to obtain the threshold according to the basic temperature range and the regulatory limit of the exhaust particulate matter value.

[0139] In some embodiments, the threshold acquisition module is further configured to:

[0140] Selecting a cumulative time array according to a basic temperature range, wherein the cumulative time array is preset and the selected cumulative time array is used to represent: a mapping relationship between the number of exhaust particles and the cumulative time within the basic temperature range;

[0141] The threshold value is obtained according to the regulatory limit value of the exhaust particle value and the accumulated time array.

[0142] In some embodiments, the threshold acquisition module is further configured to:

[0143] querying the selected cumulative time array to obtain a regulatory cumulative time corresponding to a regulatory limit of the exhaust particulate matter value;

[0144] The regulation accumulated time is corrected according to a threshold correction coefficient to obtain the threshold, wherein the threshold correction coefficient is greater than 0 and less than 1.

[0145] In some embodiments, the accumulation module is further configured to:

[0146] Divide into multiple temperature ranges;

[0147] Determine whether urea is added;

[0148] According to the absence of urea addition behavior, the accumulated time during which the temperature of urea is within each of the temperature intervals is obtained.

[0149] In some embodiments, the accumulation module is further configured to:

[0150] Get the urea liquid level change rate per unit time;

[0151] According to the liquid level change rate being greater than 0, it is determined that urea addition occurs;

[0152] According to the liquid level change rate being less than or equal to 0, it is determined that no urea addition behavior occurs.

[0153] Those skilled in the art will understand that Figure 2 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific urea status monitoring device may include more or fewer components than those shown in the figure, or combine certain components, or have a different component arrangement.

[0154] An embodiment of the present invention further provides a vehicle, comprising a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the urea status monitoring method of the above embodiment when executing the computer program.

[0155] Furthermore, the vehicle includes a computer device, which includes a processor, a memory, an input / output interface (I / O) and a communication interface. The processor, the memory and the input / output interface are connected via a system bus, and the communication interface is connected to the system bus via the input / output interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and computer program in the non-volatile storage medium. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal via a network connection. When the computer program is executed by the processor, the above-mentioned urea status monitoring method is implemented.

[0156] Optionally, the computer device includes an ECU (Electronic Control Unit), which is a device for managing and controlling the electronic system of the harvester.

[0157] An embodiment of the present invention further provides a computer storage medium having computer-readable instructions stored thereon. When the computer-readable instructions are read by one or more processors, the one or more processors execute the steps of the urea status monitoring method of the above embodiment.

[0158] The logic and / or steps represented in the flowcharts or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing the logical functions, and can be embodied in any computer-readable storage medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (e.g., a computer-based system, a system including a processor, or other system that can fetch and execute instructions from an instruction execution system, apparatus, or device). For purposes of this specification, a "computer-readable storage medium" can be any device that can contain, store, communicate, propagate, or transport a program for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable storage media include the following: an electrical connection with one or more wires (electronic device), a portable computer disk cartridge (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM, or flash memory), a fiber optic device, and a portable compact disc read-only memory (CDROM). In addition, the computer-readable storage medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, deciphering, or processing in another suitable manner as necessary, and then stored in a computer memory.

[0159] It should be understood that various parts of the present invention can be implemented using hardware, software, firmware, or a combination thereof. In the above-described embodiments, multiple steps or methods can be implemented using software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented using hardware, as in another embodiment, any one of the following technologies known in the art or a combination thereof can be used to implement the hardware: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application-specific integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0160] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A method for monitoring urea status, characterized in that: include: Dividing the temperature into multiple intervals, and obtaining the accumulated time that the temperature of urea is in each of the temperature intervals; Determining a basic temperature interval, and calculating a correction coefficient for the accumulated time in each temperature interval based on the exhaust particle value of urea in each temperature interval and the exhaust particle value of urea in the basic temperature interval; Calculating the urea high temperature cumulative time according to the cumulative time and the correction coefficient; Comparing the urea high temperature cumulative time and the threshold; According to the urea high temperature accumulated time being greater than the threshold, a prompt signal is issued.

2. The urea status monitoring method according to claim 1, characterized in that: The basic temperature interval is selected from one of the plurality of temperature intervals, and the correction coefficient of the accumulated time in each temperature interval is a ratio of the exhaust particle value of urea in each temperature interval to the exhaust particle value of urea in the basic temperature interval.

3. The urea status monitoring method according to claim 2, characterized in that: Before the step of comparing the urea high temperature accumulated time and the threshold, the urea status monitoring method further includes: The threshold value is obtained according to the basic temperature range and the regulatory limit value of the exhaust particulate matter value.

4. The urea status monitoring method according to claim 3, characterized in that: The step of obtaining the threshold value according to the basic temperature range and the regulatory limit of the exhaust particulate matter value includes: Selecting a cumulative time array according to a basic temperature range, wherein the cumulative time array is preset and the selected cumulative time array is used to represent: a mapping relationship between the number of exhaust particles and the cumulative time within the basic temperature range; The threshold value is obtained according to the regulatory limit value of the exhaust particle value and the accumulated time array.

5. The urea status monitoring method according to claim 4, characterized in that: The step of obtaining the threshold value based on the regulatory limit of the exhaust particulate matter value and the accumulated time array includes: querying the selected cumulative time array to obtain a regulatory cumulative time corresponding to a regulatory limit of the exhaust particulate matter value; The regulation accumulated time is corrected according to a threshold correction coefficient to obtain the threshold, wherein the threshold correction coefficient is greater than 0 and less than 1.

6. The urea status monitoring method according to any one of claims 1 to 5, characterized in that: The step of dividing the temperature into a plurality of intervals and obtaining the accumulated time that the temperature of urea is within each of the temperature intervals includes: Divide into multiple temperature ranges; Determine whether urea is added; According to the absence of urea addition behavior, the accumulated time during which the temperature of urea is within each of the temperature intervals is obtained.

7. The urea status monitoring method according to claim 6, characterized in that: The step of determining whether urea addition occurs includes: Get the urea liquid level change rate per unit time; According to the liquid level change rate being greater than 0, it is determined that urea addition occurs; According to the liquid level change rate being less than or equal to 0, it is determined that no urea addition behavior occurs.

8. A urea status monitoring device, characterized in that: include: An accumulation module, used for dividing the temperature into a plurality of temperature intervals and obtaining the accumulated time that the temperature of the urea is in each of the temperature intervals; a correction coefficient calculation module, configured to determine a basic temperature interval, and calculate a correction coefficient for the accumulated time in each temperature interval based on the exhaust particle value of urea in each temperature interval and the exhaust particle value of urea in the basic temperature interval; a urea high temperature cumulative time calculation module, configured to calculate the urea high temperature cumulative time based on the cumulative time and the correction coefficient; A comparison module, used to compare the urea high temperature cumulative time and the threshold; The prompt module is used to send a prompt signal according to the accumulated time of high temperature of urea being greater than the threshold value, and the prompt signal is used to instruct the terminal to send a urea replacement reminder message.

9. A vehicle, characterized in that: The invention comprises a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the urea status monitoring method according to any one of claims 1 to 7 when executing the computer program.

10. A computer storage medium, characterized in that Computer-readable instructions are stored on the computer storage medium. When the computer-readable instructions are read by one or more processors, the one or more processors are caused to execute the steps of the urea status monitoring method according to any one of claims 1 to 7.

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