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

Abstract

The invention discloses a urea state monitoring method, a urea state monitoring device, a vehicle and a computer storage medium, and the method comprises the steps: dividing a plurality of temperature intervals, and obtaining the cumulative time of the temperature of urea in each temperature interval; determining a basic temperature interval, and calculating a correction coefficient of the cumulative time of each temperature interval according to the exhaust particle value of the urea in each temperature interval and the exhaust particle value of the urea in the basic temperature interval; calculating urea high-temperature accumulation time according to the accumulation time and the correction coefficient; comparing the urea high-temperature accumulated time with a threshold value; and when the urea high-temperature accumulated time is larger than the threshold value, a prompt signal is sent out. According to the urea state monitoring method, the urea state can be monitored, and a user can be reminded to replace deteriorated urea in time.

Description

Technical Field

[0001] The present invention relates to the technical field of engines, and in particular to a urea state monitoring method, a urea state 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 sprayed into the exhaust gas, and ammonia is produced after thermal decomposition of urea, which 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 urea to deteriorate, resulting in an excessive amount of 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 degraded urea in a timely manner. Summary of the invention

[0006] The purpose 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 purpose 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] Determine a basic temperature interval, and calculate a correction coefficient of the accumulated time in each temperature interval according to the exhaust particle value of urea in each temperature interval and the exhaust particle value of urea in the basic temperature interval;

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

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

[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 a plurality of temperature intervals, obtains the cumulative time that the temperature of urea is in each temperature interval, and corrects the cumulative time by a correction coefficient, thereby obtaining the urea high temperature cumulative time that can reflect the degree of urea degradation, and compares the urea high temperature cumulative time with a threshold value to determine whether the urea needs to be replaced, thereby realizing the monitoring of the urea status. When the urea needs to be replaced, the urea status monitoring method of the embodiment of the present invention can prompt the user.

[0014] In some embodiments, the basic temperature interval is selected from one of the multiple temperature intervals, and the correction coefficient of the accumulated time in 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.

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

[0016] The threshold value is obtained according to the basic temperature interval and the regulatory limit value of the exhaust particle value.

[0017] In some embodiments, the step of obtaining the threshold value according to the basic temperature range and the regulatory limit of the exhaust particle value includes:

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

[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 according to the regulatory limit of the exhaust particle value and the accumulated time array includes:

[0021] Querying the selected cumulative time array to obtain the regulatory cumulative time corresponding to the regulatory limit of the exhaust particulate 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 temperature intervals and obtaining the accumulated time that the temperature of urea is in each of the temperature intervals includes:

[0024] Divide into multiple temperature intervals;

[0025] Determine whether urea is added;

[0026] According to the absence of urea adding behavior, the accumulated time that the temperature of urea is in each of the temperature intervals is obtained.

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

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

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

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

[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, used for determining a basic temperature interval, and calculating a correction coefficient of the accumulated time in each temperature interval according to 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, used to calculate the urea high temperature cumulative time according to the cumulative time and the correction coefficient;

[0035] A comparison module, used for comparing 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, wherein 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 as described in the first aspect above when executing the computer program.

[0038] The 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 of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference numerals are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

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

[0041] Figure 2 is a 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] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the 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. On the contrary, these embodiments are provided in order 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 only for the purpose of describing specific example embodiments 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 "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence 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 interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order 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, 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, spatial 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 figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure is turned over, then the elements described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." can include both upper and lower orientations. The device can be oriented otherwise (rotated 90 degrees or in other directions) and the spatial relative descriptors used in the text 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 sprayed into the exhaust gas, and ammonia is produced after thermal decomposition of urea, which reacts with NOx to significantly reduce NOx emissions, thereby meeting the emission requirements of NOx in diesel engine exhaust.

[0048] If urea is not used for a long time in a high temperature environment, it will cause urea to deteriorate. In deteriorated urea, the free ammonia concentration and conductivity will increase significantly, and the urea hydrolysis efficiency will decrease, which will lead to a significant increase in the number of particles in the exhaust, resulting in the number of particles in the exhaust exceeding the standard, and then causing the diesel engine exhaust to fail to meet the emission requirements. Therefore, when urea is not used for a long time in a high temperature environment, the urea needs to be replaced. Therefore, when urea is not used for a long time in a high temperature environment, the urea needs to be replaced.

[0049] However, the related art lacks a method for monitoring the state of urea, which makes it difficult for users to know whether the urea can be used normally, thereby making it difficult for users to replace deteriorated urea in time.

[0050] In order to at least solve the problem of lack of method for monitoring urea status in the related art.

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

[0052] The urea status monitoring method according to an embodiment of the present invention is described below with reference to the accompanying drawings.

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

[0054] S100, dividing into multiple temperature 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 of the accumulated time in each temperature interval according to 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 according to the cumulative time and correction coefficient of each temperature interval;

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

[0058] S500: According to the fact that the accumulated time of high temperature of urea is greater than a threshold value, a prompt signal is issued.

[0059] Urea degradation refers to the change of urea's chemical properties due to various reasons during storage and use, which affects the use effect and safety of urea. Urea deteriorates to different 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, dividing the temperature into multiple intervals, and obtaining 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 in each temperature interval is obtained to reduce the amount of calculation of the accumulated time.

[0063] Preferably, the total temperature interval is a temperature greater than 40° C. and less than or equal to 70° C., 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 that the temperature of urea in the diesel engine urea tank is greater than 70°C is small. Therefore, taking the temperature greater than 40°C and less than or equal to 70°C as the total temperature interval, and dividing the total temperature interval to form multiple temperature intervals, the interval length of the total temperature interval can be reduced, thereby reducing the amount of calculation.

[0065] As some examples of dividing the temperature intervals, the interval length of each temperature interval is 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 , determining a basic temperature interval, and calculating a correction coefficient of the accumulated time in each temperature interval according to 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 is different in each temperature interval, it is necessary to determine the basic temperature interval, calculate the correction coefficient based on the exhaust particle value of urea in the basic temperature interval and the exhaust particle value of urea in each temperature interval, and correct the accumulated time that the temperature of urea is in each temperature interval by the correction coefficient.

[0069] The exhaust particle value of urea in each temperature interval refers to the value of the exhaust particle after urea is injected into the exhaust when the urea is maintained in each temperature interval. For example, the exhaust particle value of urea in the first temperature interval refers to the exhaust particle after urea is injected into the exhaust when the urea is maintained in the first temperature interval.

[0070] The exhaust particle value of urea in the basic temperature range refers to the value of the exhaust particle 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 a plurality of temperature intervals, which can reduce the complexity of the method of this embodiment and can further reduce the amount of calculation.

[0073] Preferably, 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. The temperature interval greater than 40°C and less than or equal to 50°C is used as the basic temperature interval. In the urea tank, the temperature of urea is greater than 40°C and less than or equal to 50°C for a long time, so using the temperature interval greater than 40°C and less than or equal to 50°C as the basic 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 of 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 the particulate matter in the exhaust after urea is sprayed into the exhaust when the urea is kept at 40°C. N_50 is the value of the particulate matter in the exhaust after urea is sprayed into the exhaust when the urea is kept at 50°C.

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

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

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

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

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

[0083] Wherein, N_70 is the value of particulate matter in the exhaust after urea is sprayed 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 according to 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 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, and the temperature interval greater than 40°C and less than or equal to 50°C is used as the basic temperature interval. The urea high temperature cumulative time T_toal is calculated by 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, T3 is the accumulated time in the third temperature interval.

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

[0092] By comparing the urea high temperature accumulated 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 basic temperature range and the regulatory limits for the exhaust particle 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 according to the basic temperature range and the regulatory limit value of the exhaust particle value includes:

[0098] Selecting a cumulative time array according to a basic temperature range, 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;

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

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

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

[0102] Urea deteriorates to different degrees in each temperature range. Therefore, in each temperature range, the mapping relationship between the number of exhaust particles and the cumulative time is different, that is, the cumulative time array in each temperature range is different. The cumulative time array is selected according to the basic temperature range so that the selected cumulative time array can correctly represent: the mapping relationship between the number of exhaust particles and the cumulative time in the basic 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 value of the exhaust particle value and the accumulation time array.

[0105] Furthermore, the selected cumulative time array is used to represent the mapping relationship between the number of exhaust particles and the cumulative time when the urea is at the average temperature of the basic temperature range, so as to reduce the difficulty of fitting the cumulative 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, and 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] Further, the step of obtaining a threshold value according to the regulatory limit of the exhaust particle value and the cumulative time array includes:

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

[0109] The regulatory accumulated time is corrected according to the threshold correction coefficient to obtain the threshold, 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 for replacing urea to reduce the probability that the exhaust particulate value is greater than the regulation limit.

[0112] S500: According to the fact that the accumulated time of high temperature of urea is greater than a threshold value, a prompt signal is issued.

[0113] The prompt signal is used to instruct the terminal to issue a urea replacement reminder message. If the accumulated urea high temperature time is greater than the threshold, it means that the urea is seriously deteriorated and needs to be replaced. The prompt signal is issued to remind 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 a word or icon prompting to replace urea, so as to send out a urea replacement reminder message.

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

[0116] The urea status monitoring method of the embodiment of the present invention divides a plurality of temperature intervals, obtains the cumulative time that the temperature of urea is in each temperature interval, corrects the cumulative time by a correction coefficient, thereby obtaining the urea high temperature cumulative time that can reflect the degree of urea degradation, and compares the urea high temperature cumulative time with a threshold value to determine whether the urea needs to be replaced, thereby realizing the monitoring of the urea status. 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 intervals;

[0119] Determine whether urea is added;

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

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

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

[0123] like Figure 3 As shown, in some embodiments, the step of determining whether there is an act of adding urea includes:

[0124] Obtain 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 exists.

[0127] The urea addition behavior is judged by the liquid level change rate, so that it is possible to accurately judge whether urea addition behavior exists.

[0128] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed 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 part of the steps or stages in other steps.

[0129] Based on the same inventive concept, the embodiment of the present application also provides a urea state monitoring device for implementing the above-mentioned urea state monitoring method. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above-mentioned method, so the specific limitations in one or more urea state monitoring device embodiments provided below can refer to the limitations of the urea state monitoring method above, and will not be repeated here.

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

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

[0132] A correction coefficient calculation module is used to determine a basic temperature interval, and calculate a correction coefficient of the accumulated time in each temperature interval according to 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 according to the cumulative time and correction coefficient;

[0134] Comparison module, used to compare the 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 multiple temperature intervals, and the correction coefficient of the accumulated time in 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.

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

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

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

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

[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 used to:

[0143] Querying the selected cumulative time array to obtain the regulatory cumulative time corresponding to the regulatory limit of the exhaust particulate 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 intervals;

[0147] Determine whether urea is added;

[0148] According to the absence of urea adding behavior, the accumulated time that the temperature of urea is in each of the temperature intervals is obtained.

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

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

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

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

[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 present application scheme, and does not constitute a limitation on the computer device to which the present application scheme 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 for short) 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 the 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 on which computer-readable instructions are stored. 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 flowchart or otherwise described herein, for example, may be considered as an ordered list of executable instructions for implementing logical functions, and may be embodied in any computer-readable storage medium for use by an instruction execution system, apparatus, or device (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, apparatus, or device and execute instructions), or in conjunction with such instruction execution system, apparatus, or device. For purposes of this specification, a "computer-readable storage medium" may be any device that can contain, store, communicate, propagate, or transmit a program for use by an instruction execution system, apparatus, or device, or in conjunction with such instruction execution system, apparatus, or device. More specific examples of computer-readable storage media (a non-exhaustive list) include the following: an electrical connection with one or more wirings (electronic devices), a portable computer disk case (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM, Erasable Programmable Read-Only Memory, or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM, Compact Disc Read-Only Memory). In addition, the computer-readable storage medium may even be a 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 the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiment, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA, Programmable Gate Array), a field programmable gate array (FPGA, Field Programmable Gate Array), etc.

[0160] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope 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; Determine a basic temperature interval, and calculate a correction coefficient of the accumulated time in each temperature interval according to the exhaust particle value of urea in each temperature interval and the exhaust particle value of urea in the basic temperature interval; Calculate the urea high temperature cumulative time according to the cumulative time and the correction coefficient; Comparing the urea high temperature accumulated time and the threshold value; 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 interval and the regulatory limit value of the exhaust particle 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 value of the exhaust particle value comprises: Selecting a cumulative time array according to a basic temperature interval, the cumulative time array being preset, and the selected cumulative time array being used to represent: a mapping relationship between the number of exhaust particles and the cumulative time within the basic temperature interval; 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 according to the regulatory limit of the exhaust particle value and the accumulated time array comprises: Querying the selected cumulative time array to obtain the regulatory cumulative time corresponding to the regulatory limit of the exhaust particulate 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 temperature intervals and obtaining the accumulated time that the temperature of urea is in each of the temperature intervals comprises: Divide into multiple temperature intervals; Determine whether urea is added; According to the absence of urea adding behavior, the accumulated time that the temperature of urea is in each of the temperature intervals is obtained.

7. The urea status monitoring method according to claim 6, characterized in that: The step of judging whether there is an act of adding urea comprises: Obtain the urea liquid level change rate per unit time; According to the liquid level change rate being greater than 0, it is judged that urea is added; According to the liquid level change rate being less than or equal to 0, it is determined that no urea addition behavior exists.

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, used for determining a basic temperature interval, and calculating a correction coefficient of the accumulated time in each temperature interval according to 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, used to calculate the urea high temperature cumulative time according to the cumulative time and the correction coefficient; A comparison module, used for comparing 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, wherein 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: The computer storage medium stores computer-readable instructions, and 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 according to any one of claims 1 to 7.

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