Urea injection control method, device, storage medium, and vehicle

Abstract

The application provides a urea injection control method, device, storage medium and vehicle. The urea injection control method comprises the following steps: when a heating assembly integrated on a urea pump is in a working state and a urea injection request is received, the total amount of liquid urea in a urea tank and a requested urea amount carried in the urea injection request are acquired; a target urea amount is determined according to the total amount of liquid urea, the requested urea amount and a preset threshold value, the preset threshold value being the minimum total amount of liquid urea for heat conduction in the working process of the heating assembly; and the urea pump is controlled to perform urea injection at the target urea amount. The application does not directly perform urea injection with the requested urea amount carried in the urea injection request, but performs urea injection with the target urea amount. Since the determination of the target urea amount combines the total amount of liquid urea, the requested urea amount and the preset threshold value, the problem of reduced thawing efficiency of frozen urea caused by air as a heat transfer medium can be avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobiles, in particular to a urea injection control method and device, a storage medium and a vehicle. BACKGROUND

[0002] With the increasingly stringent emission regulations, in order to meet the emission requirements of NOx in exhaust gas, the diesel engine selective catalytic reduction (SCR) aftertreatment system has become an inevitable option to meet the emission regulations. Through the SCR aftertreatment system, the NOx emissions can be reduced below the regulatory limit. The diesel engine SCR aftertreatment system transports the urea solution in the urea tank from the urea delivery pipe to the nozzle through the urea pump, so as to control the opening of the urea nozzle according to the urea injection request signal issued by the engine electrical control unit (ECU), inject the urea solution into the mixing chamber, realize the timed and quantitative urea injection, and reduce the NOx in the exhaust gas.

[0003] Since the urea solution starts to freeze when the ambient temperature is lower than -11℃, in the cold winter areas, after the vehicle starts, the heating assembly integrated on the urea pump starts to work to thaw the frozen urea into liquid urea and deliver it to the nozzle. However, due to the limitation of the heating assembly of the urea pump, only the frozen urea around the urea pump can be thawed, and the thawing efficiency decreases with the decrease of the amount of liquid urea, thereby reducing the utilization rate of urea in the urea tank. SUMMARY

[0004] The embodiments of the present application provide a urea injection control method, device, storage medium and vehicle to solve the problem of how to improve the urea thawing efficiency when the urea in the urea tank freezes.

[0005] In a first aspect, the embodiments of the present application provide a urea injection control method, which comprises:

[0006] When the heating assembly integrated on the urea pump is in a working state and receives a urea injection request, the total amount of liquid urea in the urea tank and the requested urea amount carried in the urea injection request are obtained;

[0007] According to the total amount of liquid urea, the requested urea amount and a preset threshold value, a target urea amount is determined, wherein the preset threshold value is the minimum total amount of liquid urea for heat conduction in the working process of the heating assembly;

[0008] The urea pump is controlled to perform urea injection with the target urea amount.

[0009] In a second aspect, the embodiments of the present application also provide a urea injection control device, which comprises:

[0010] The first obtaining module is configured to obtain a total amount of liquid urea in the urea tank and a requested urea amount carried in the urea injection request when the heating assembly integrated on the urea pump is in a working state and the urea injection request is received.

[0011] The first determining module is configured to determine a target urea amount according to the total amount of liquid urea, the requested urea amount and a preset threshold, wherein the preset threshold is a minimum total amount of liquid urea for heat conduction in the working process of the heating assembly.

[0012] The first control module is configured to control the urea pump to perform urea injection at the target urea amount.

[0013] In a third aspect, an embodiment of the present application further provides a computer readable storage medium, and the computer readable storage medium stores a computer program. The computer program is executed by a processor to implement the urea injection control method.

[0014] In a fourth aspect, an embodiment of the present application provides a vehicle, and the vehicle includes a processor, a memory and a computer program stored in the memory and executable on the processor. The computer program is executed by the processor to implement the urea injection control method.

[0015] The embodiments of the present application at least have the following technical effects:

[0016] In the technical scheme of the embodiments of the present application, when the urea injection control unit (DCU) detects that the heating assembly integrated on the urea pump is in a working state, the urea injection control unit (DCU) does not directly perform urea injection at the requested urea amount carried in the urea injection request when the urea injection request is received, but needs to determine a target urea amount and control the urea pump to perform urea injection at the target urea amount. Since the determination of the target urea amount combines the total amount of liquid urea, the requested urea amount and the preset threshold which is the minimum total amount of liquid urea for heat conduction in the working process of the heating assembly, the remaining liquid urea in the urea tank can be used as a heat transfer medium to transfer the heat generated by the heating assembly to the frozen urea after the urea injection at the target urea amount, so that the problem of reduced thawing efficiency of the frozen urea caused by air as a heat transfer medium can be avoided. In addition, since a part of the liquid urea thawed in the urea tank is used for injection and another part is used as a heat transfer medium to participate in the thawing of the frozen urea, the utilization rate of the liquid urea can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced.

[0018] Figure 1 is a flowchart of a urea injection control method provided by an embodiment of the present application;

[0019] Figure 2 is a structural diagram of a urea injection control system corresponding to an embodiment of the present application;

[0020] Figure 3 is a structural diagram of a urea injection control device provided by an embodiment of the present application;

[0021] Figure 4 is a structural diagram of a vehicle provided by an embodiment of the present application. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0023] It should be understood that the "one embodiment" or "an embodiment" mentioned throughout the specification means that the specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the present application. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner.

[0024] In various embodiments of the present application, it should be understood that the size of the serial number of each process does not mean the order of execution, and the execution order of each process should be determined according to its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0025] As shown in Figure 1 The present application provides a urea injection control method, which comprises the following steps:

[0026] In step 101, when the heating assembly integrated on the urea pump is in a working state and a urea injection request is received, the total amount of liquid urea in the urea tank and the requested urea amount carried in the urea injection request are obtained.

[0027] The urea injection control method provided by the present application is applied to a urea injection control unit (DCU), as shown in Figure 2As shown, the urea injection control system includes a urea DCU 201, a urea tank 204, a urea pump 205, a urea delivery pipe 206 and a urea nozzle 207, the urea DCU 201 is connected with the engine ECU 202 through a wire harness 203, and the urea DCU 201 is also connected with the urea pump 205 in the urea tank 204 through the wire harness 203. When the urea injection request sent by the engine ECU 202 is received by the urea DCU 201, the urea pump 205 is controlled to deliver the urea solution in the urea tank 204 to the urea nozzle 207 through the urea delivery pipe 206, and the urea nozzle 207 is controlled to open to inject the urea solution into the mixing chamber 208, thereby reducing NOx in the exhaust gas. In addition, the urea injection control system also includes a urea filling pipe 209 arranged on the urea tank 204. The first end of the urea filling pipe 209 is in communication with the urea tank 204, and the second end is used for filling the urea solution into the urea tank 204. An addition opening cover 210 is arranged at the second end. When it is necessary to add the urea solution, the addition opening cover 210 is opened, and the urea solution can be added to the urea tank 204 through the urea filling pipe 209.

[0028] In this embodiment, the heating assembly is integrated on the urea pump. When the ambient temperature is low, the urea in the urea tank will freeze. At this time, the frozen urea can be thawed into liquid urea by the heating assembly, so that the urea solution can be injected into the mixing chamber when the urea injection request sent by the engine ECU is received.

[0029] Specifically, during the working process of the heating assembly, the frozen urea around the heating assembly is melted into liquid by the heating assembly. After that, the liquid urea is around the heating assembly. The heat energy generated by the heating assembly is transmitted to the frozen urea through the liquid urea, so as to realize the conversion of the frozen urea into liquid urea. That is to say, the liquid urea in the urea tank has the function of heat transfer in addition to the function of being pressurized and injected into the mixing chamber by the urea pump for reducing NOx in the exhaust gas when there is a demand for injection. Therefore, when the urea injection request sent by the engine ECU is detected under the condition that the heating assembly is in the working state, the total amount of the liquid urea in the urea tank and the requested urea amount carried in the urea injection demand need to be obtained.

[0030] Step 102, determining a target urea amount according to the total amount of liquid urea, the requested urea amount and a preset threshold value, wherein the preset threshold value is the minimum total amount of liquid urea for heat conduction in the working process of the heating assembly.

[0031] Specifically, the embodiment of the present application pre-sets a minimum total amount of liquid urea for heat conduction in the working process of the heating assembly, i.e., a pre-set threshold. It needs to be noted that when the total amount of liquid urea in the urea tank is less than the pre-set threshold, at least part or all of the heat generated by the heating assembly will be transferred to the frozen urea through air, compared with being directly transferred to the frozen urea through liquid urea, the amount of frozen urea melted in a unit of time will be greatly reduced, thereby affecting the melting efficiency of the frozen urea. The pre-set threshold can be calibrated according to experiments, for example, by gradually increasing the amount of liquid urea, detecting the melting speed of the frozen urea, as the amount of liquid urea increases, the melting speed will increase, when the amount of liquid urea increases to a certain amount, the melting speed no longer increases, the amount of urea can be determined as the pre-set threshold, which is not limited in the present application.

[0032] After obtaining the total amount of liquid urea in the urea tank and the requested urea amount carried in the urea injection request, the target urea amount can be determined in combination with the pre-set threshold. The target urea amount is the maximum urea amount that the current urea pump can inject out determined by the urea DCU.

[0033] Step 103, controlling the urea pump to inject urea at the target urea amount.

[0034] After determining the target urea amount, the urea DCU controls the urea pump to inject urea into the mixing chamber at the target urea amount.

[0035] In the embodiment of the present application, when the heating assembly integrated on the urea pump is in the working state, the urea DCU does not directly inject urea at the requested urea amount carried in the urea injection request when receiving the urea injection request, but needs to determine a target urea amount and control the urea pump to inject urea at the target urea amount. Since the determination of the target urea amount combines the total amount of liquid urea, the requested urea amount, and the minimum total amount of liquid urea for heat conduction in the working process of the heating assembly, i.e., the pre-set threshold, after injecting urea at the target urea amount, the remaining liquid urea in the urea tank can be used as a heat transfer medium to transfer the heat generated by the heating assembly to the frozen urea, which can avoid the problem of reduced thawing efficiency of the frozen urea caused by air as a heat transfer medium. In addition, since part of the thawed liquid urea in the urea tank is used for injection and the other part is used as a heat transfer medium to participate in thawing the frozen urea, the utilization rate of liquid urea is also improved.

[0036] In an optional embodiment of the present application, the target urea amount is determined according to the total amount of liquid urea, the requested urea amount, and the pre-set threshold, comprising:

[0037] calculating a first urea amount, wherein the first urea amount is equal to the difference between the total amount of liquid urea and the requested urea amount;

[0038] determining the requested urea amount as the target urea amount when the first urea amount is greater than or equal to the preset threshold value;

[0039] calculating a second urea amount when the first urea amount is less than the preset threshold value, wherein the second urea amount is equal to a difference between the total liquid urea amount and the preset threshold value, and determining the second urea amount as the target urea amount.

[0040] Specifically, when determining the target urea amount according to the total liquid urea amount, the requested urea amount and the preset threshold value, a difference between the total liquid urea amount and the requested urea amount can be calculated as the first urea amount, which represents the remaining urea amount in the urea tank if the urea pump sprays urea in the requested urea amount. By comparing the first urea amount with the preset threshold value, it can be determined whether the remaining liquid urea after urea spraying in the requested urea amount will cause a loss of heat transfer efficiency to the surrounding iced urea.

[0041] When the first urea amount is greater than or equal to the preset threshold value, it indicates that the remaining liquid urea in the urea tank after urea spraying in the requested urea amount is more than or equal to the preset threshold value, and therefore will not affect the melting efficiency of the iced urea. In this case, urea can be sprayed in the requested urea amount, that is, the requested urea amount is determined as the target urea amount.

[0042] When the first urea amount is less than the preset threshold value, it indicates that the remaining liquid urea in the urea tank after urea spraying in the requested urea amount is less than the preset threshold value. In this case, the urea spraying amount needs to be controlled, that is, the urea spraying amount needs to be limited, to ensure that the remaining liquid urea in the urea tank is more than or equal to the preset threshold value, so as to avoid the problem of reduced thawing efficiency of iced urea caused by air as a heat transfer medium. Specifically, a second urea amount can be calculated, wherein the second urea amount is a difference between the total liquid urea amount and the preset threshold value, and the second urea amount is determined as the target urea amount.

[0043] The above embodiments of the present application determine the target urea amount by calculating the first urea amount, and determine whether the urea spraying amount needs to be controlled by comparing the first urea amount with the preset threshold value, so that the remaining liquid urea in the urea tank is more than or equal to the preset threshold value, thereby avoiding the problem of reduced thawing efficiency of iced urea caused by air as a heat transfer medium.

[0044] In an optional embodiment of the present application, the method further comprises:

[0045] after the vehicle is started, obtaining an ambient temperature and a urea tank temperature;

[0046] determining whether a preset heating condition corresponding to the heating assembly is met according to the ambient temperature and the urea tank temperature;

[0047] When the preset heating condition is met, the heating assembly is controlled to enter a working state.

[0048] Specifically, after the vehicle is started, the urea DCU is woken up, and the urea DCU monitors the ambient temperature and the urea tank temperature through the temperature sensor. Whether the heating assembly meets the preset heating condition can be determined according to the ambient temperature and the urea tank temperature. When the preset heating condition is met, the heating assembly is controlled to enter a working state to thaw the frozen urea in the urea tank.

[0049] It should be noted that whether the urea in the urea tank is frozen is determined by the ambient temperature and the urea tank temperature. Generally, urea starts to freeze when the ambient temperature is lower than minus 11 degrees Celsius. However, the temperature of the position where the urea tank is located is higher than the ambient temperature, so the temperature in the urea tank also needs to be detected. In cold winter areas, in order to avoid the situation that the urea pump cannot deliver urea to the urea nozzle due to frozen urea, a heating assembly needs to be integrated on the urea pump to thaw the frozen urea.

[0050] The above-mentioned embodiments of the present application can detect the ambient temperature and the urea tank temperature after the vehicle is started, so that the heating assembly can be turned on in time when the urea is frozen to thaw the frozen urea and avoid the situation that the urea cannot be delivered to the urea nozzle.

[0051] In an optional embodiment of the present application, whether the preset heating condition corresponding to the heating assembly is met is determined according to the ambient temperature and the urea tank temperature, including:

[0052] When the ambient temperature is lower than a first temperature threshold and / or the urea tank temperature is lower than a second temperature threshold, it is determined that the preset heating condition is met.

[0053] Specifically, when it is determined whether the preset heating condition corresponding to the heating assembly is met according to the ambient temperature and the urea tank temperature, it can be determined that the preset heating condition is met when the ambient temperature is lower than the first temperature threshold, or it can be determined that the preset heating condition is met when the urea tank temperature is lower than the second temperature threshold, or it can be determined that the preset heating condition is met when the ambient temperature is lower than the first temperature threshold and the urea tank temperature is lower than the second temperature threshold.

[0054] It should be noted that the standard concentration (32.5%) urea solution starts to freeze below minus 11℃. Considering that the concentration of the urea solution will affect the freezing temperature of the urea solution (the lower the concentration, the higher the freezing point), the first temperature threshold and the second temperature threshold need to be set to a temperature value higher than minus 11 degrees Celsius, for example, the first temperature threshold and the second temperature threshold can be set to a value between minus 5℃ and minus 10℃.

[0055] In the above-mentioned embodiments of the present application, whether the urea in the urea tank is frozen can be determined by comparing the ambient temperature with the first temperature threshold and comparing the urea tank temperature with the second temperature threshold, and then whether the preset heating condition corresponding to the heating assembly is met can be determined, so that whether the preset heating condition is met can be determined only by monitoring the temperature collected by the temperature sensor.

[0056] In an optional embodiment of the present application, the method further comprises:

[0057] When the heating assembly enters the working state, a target thawing duration is determined according to the ambient temperature and the urea tank temperature;

[0058] At an end time corresponding to the target thawing duration, the urea pump is controlled to start pressure building, and a reminder signal is sent to an engine electronic control unit, the reminder signal being used to prompt the engine electronic control unit that the urea pump starts pressure building.

[0059] Specifically, when the vehicle starts and the heating assembly enters the working state, the frozen urea in the urea tank starts thawing, and the liquid urea in the urea tank starts increasing, but the urea pump can start pressure building only when the liquid urea reaches a certain amount, so the time when the urea pump starts pressure building needs to be determined.

[0060] In the embodiments of the present application, after the ambient temperature and the urea tank temperature are obtained, a target thawing duration for the thawed liquid to reach a target value can be determined according to the ambient temperature and the urea tank temperature, at an end time of the target thawing duration, the liquid urea in the urea tank reaches the target value, satisfying the pressure building condition, at this time, the urea pump can be controlled to start pressure building, and a reminder signal can be sent to an engine electronic control unit to prompt the engine electronic control unit that the urea pump starts pressure building, then, after the engine electronic control unit determines the urea request amount, a urea request signal carrying the urea request amount can be sent to the urea DCU.

[0061] In the above-mentioned embodiments of the present application, by determining the target thawing duration, the urea pump can be controlled to start pressure building at the end time of the target thawing duration, and a reminder signal can be sent to the engine electronic control unit, the sending of the reminder signal can ensure that the urea request signal sent by the engine electronic control unit is sent after the reminder signal is received, and the situation that the urea pump cannot respond to the urea request signal when the urea pump does not build pressure can be avoided.

[0062] In an optional embodiment of the present application, determining the target thawing duration according to the ambient temperature and the urea tank temperature comprises:

[0063] According to a correspondence between the ambient temperature and the thawing duration stored in advance, a first thawing duration corresponding to the ambient temperature is determined;

[0064] determine a second thawing time length corresponding to the urea tank temperature according to the correspondence between the urea tank temperature and the thawing time length pre-stored;

[0065] determine the target thawing time length as the longer one of the first thawing time length and the second thawing time length.

[0066] Specifically, in the determination of the target thawing time length, a first thawing time length corresponding to the ambient temperature can be determined according to the correspondence between the ambient temperature and the thawing time length pre-stored, a second thawing time length corresponding to the urea tank temperature can be determined according to the correspondence between the urea tank temperature and the thawing time length pre-stored, and after obtaining the first thawing time length and the second thawing time length, the target thawing time length can be determined as the longer one of the first thawing time length and the second thawing time length.

[0067] It should be noted that the correspondence between the ambient temperature and the thawing time length pre-stored and the correspondence between the urea tank temperature and the thawing time length pre-stored are the correspondences between the thawing time lengths of the liquid urea reaching the target value under different ambient temperatures and urea tank temperatures pre-calibrated through experiments.

[0068] The above-mentioned embodiments of the present application can determine the first thawing time length and the second thawing time length by table lookup after detecting the ambient temperature and the urea tank temperature, and then obtain the target thawing time length, which is convenient for controlling the urea pump to start building pressure at the end of the target thawing time length.

[0069] In an optional embodiment of the present application, the total amount of liquid urea in the urea tank is obtained, including:

[0070] determine the total amount of thawed urea according to the working time length corresponding to the heating assembly and the thawing efficiency corresponding to the heating assembly;

[0071] obtain the total amount of injected urea corresponding to the urea pump;

[0072] determine the total amount of liquid urea in the urea tank according to the total amount of thawed urea and the total amount of injected urea.

[0073] Specifically, when the total amount of liquid urea in the urea tank is obtained, since the urea tank contains both liquid urea and frozen urea, the total amount of liquid urea cannot be obtained by directly reading the scale. At this time, when the heating assembly starts to work, the urea tank contains only frozen urea, and the amount of liquid urea is 0. As the heating assembly works, the frozen urea is melted into liquid urea. Through the working time of the heating assembly and the thawing efficiency corresponding to the heating assembly, the total amount of urea melted after the heating assembly starts to work, that is, the total amount of thawed urea, can be obtained. After the vehicle starts, the urea DCU receives the urea request signal sent by the engine ECU and controls the urea pump to spray liquid urea into the mixing chamber based on the urea request signal. Then, by monitoring the urea pump, the total amount of urea sprayed by the urea pump can be obtained. After the total amount of thawed urea and the total amount of sprayed urea are determined, the total amount of liquid urea in the urea tank can be determined, that is, the total amount of thawed urea minus the total amount of sprayed urea.

[0074] The above embodiment of the present application determines the total amount of liquid urea in the urea tank. Since the urea in the urea tank is not completely thawed into liquid urea, a part of it is frozen urea, and the total amount of liquid urea cannot be directly determined. The total amount of liquid urea in the urea tank can be indirectly determined by the total amount of thawed urea and the total amount of sprayed urea. When the urea request signal is received, whether the urea request amount carried in the urea request signal can be used for urea spraying can be determined based on the total amount of liquid urea, so as to avoid the situation that the remaining urea amount in the urea tank is insufficient for heat transfer and thus the thawing efficiency is reduced.

[0075] The above introduces the urea injection control method provided by the embodiment of the present application. The urea injection control device provided by the embodiment of the present application will be introduced below in combination with the drawings.

[0076] As shown in Figure 3 The present embodiment also provides a urea injection control device. The device comprises:

[0077] The first acquisition module 301 is configured to acquire the total amount of liquid urea in the urea tank and the request urea amount carried in the urea injection request when the heating assembly integrated on the urea pump is in a working state and the urea injection request is received.

[0078] The first determination module 302 is configured to determine a target urea amount according to the total amount of liquid urea, the request urea amount and a preset threshold value. The preset threshold value is the minimum total amount of liquid urea for heat conduction in the working process of the heating assembly.

[0079] The first control module 303 is configured to control the urea pump to spray urea in the target urea amount.

[0080] Optionally, the first determining module comprises:

[0081] a calculating sub-module, configured to calculate a first urea amount, wherein the first urea amount is equal to a difference between the total liquid urea amount and the requested urea amount;

[0082] a first determining sub-module, configured to determine the requested urea amount as the target urea amount when the first urea amount is greater than the preset threshold value;

[0083] a second determining sub-module, configured to calculate a second urea amount when the first urea amount is less than the preset threshold value, wherein the second urea amount is equal to a difference between the total liquid urea amount and the preset threshold value, and determine the second urea amount as the target urea amount.

[0084] Optionally, the device further comprises:

[0085] a second obtaining module, configured to obtain an ambient temperature and a urea tank temperature after the vehicle is started;

[0086] a judging module, configured to judge whether a preset heating condition corresponding to the heating assembly is met according to the ambient temperature and the urea tank temperature;

[0087] a second control module, configured to control the heating assembly to enter a working state when the preset heating condition is met.

[0088] Optionally, the device further comprises:

[0089] a second determining module, configured to determine a target thawing duration according to the ambient temperature and the urea tank temperature when the heating assembly enters the working state;

[0090] a control sending module, configured to control the urea pump to start pressure building at an ending moment corresponding to the target thawing duration, and send a reminding signal to an engine electronic control unit, the reminding signal being used to prompt the engine electronic control unit that the urea pump starts pressure building.

[0091] Optionally, the first obtaining module comprises:

[0092] a third determining sub-module, configured to determine a total thawed urea amount according to a working duration corresponding to the heating assembly and a thawing efficiency corresponding to the heating assembly;

[0093] an obtaining sub-module, configured to obtain a total injected urea amount corresponding to the urea pump;

[0094] a fourth determining sub-module, configured to determine a total liquid urea amount in the urea tank according to the total thawed urea amount and the total injected urea amount.

[0095] Optionally, the judging module is further configured to:

[0096] When the ambient temperature is lower than a first temperature threshold and / or the urea tank temperature is lower than a second temperature threshold, it is determined that the preset heating condition is met.

[0097] Optionally, the second determining module comprises:

[0098] The fifth determining sub-module is configured to determine a first thawing duration corresponding to the ambient temperature according to a pre-stored correspondence between ambient temperatures and thawing durations;

[0099] The sixth determining sub-module is configured to determine a second thawing duration corresponding to the urea tank temperature according to a pre-stored correspondence between urea tank temperatures and thawing durations;

[0100] The seventh determining sub-module is configured to determine a larger duration between the first thawing duration and the second thawing duration as the target thawing duration.

[0101] The urea injection control device provided in the application, when the heating assembly integrated on the urea pump is in a working state, the urea DCU does not directly perform urea injection with the requested urea amount carried in the urea injection request when receiving the urea injection request, but needs to determine a target urea amount and control the urea pump to perform urea injection with the target urea amount. Since the determination of the target urea amount combines the total liquid urea amount, the requested urea amount, and the minimum total liquid urea amount for heat conduction in the working process of the heating assembly, i.e., the preset threshold, after urea injection with the target urea amount, the remaining liquid urea in the urea tank can be used as a heat transfer medium to transfer the heat generated by the heating assembly to the frozen urea, which can avoid the problem of reduced thawing efficiency of the frozen urea caused by air as a heat transfer medium. In addition, since part of the thawed liquid urea in the urea tank is used for injection and the other part is used as a heat transfer medium to participate in thawing the frozen urea, the utilization rate of liquid urea is also improved.

[0102] The embodiment of the application further provides a computer readable storage medium, and the computer readable storage medium stores a computer program. The computer program is executed by a processor to implement each process of the above-mentioned urea injection control method embodiment and achieve the same technical effect. To avoid repetition, details are not described herein.

[0103] The embodiment of the application further provides a vehicle, which comprises a processor, a memory, and a computer program stored on the memory and executable on the processor. The computer program is executed by the processor to implement each process of the above-mentioned urea injection control method embodiment and achieve the same technical effect. To avoid repetition, details are not described herein.

[0104] For example,Figure 4 A schematic diagram of a physical structure of a vehicle is shown.

[0105] As Figure 4 shown, the vehicle can include a processor 410, a communications interface 420, a memory 430, and a communications bus 440, wherein the processor 410, the communications interface 420, and the memory 430 complete communications with each other through the communications bus 440. The processor 410 can invoke a logical instruction in the memory 430, and the processor 410 is configured to perform the following steps: when a heating assembly integrated on a urea pump is in a working state and a urea injection request is received, obtaining a total amount of liquid urea in a urea tank and a requested urea amount carried in the urea injection request; determining a target urea amount according to the total amount of liquid urea, the requested urea amount, and a preset threshold value, wherein the preset threshold value is a minimum total amount of liquid urea for heat conduction in a working process of the heating assembly; and controlling the urea pump to perform urea injection at the target urea amount.

[0106] In addition, the logical instruction in the memory 430 described above can be implemented in the form of a software function unit and sold or used as an independent product, and can be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application essentially or the part that contributes to the prior art or part of the technical solutions can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a plurality of instructions to make a computer device (which can be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk or an optical disk, and various program code storage media.

[0107] It should be noted that in this document, the terms "comprising", "including", or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or apparatus including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such a process, method, article, or apparatus. Without more limitations, the element defined by the statement "including a" does not exclude the presence of additional identical elements in the process, method, article, or apparatus including the element.

[0108] Those skilled in the art can clearly understand that the above-mentioned embodiment method can be realized by means of software and necessary general hardware platform, of course, it can also be realized by hardware, but in many cases, the former is a better embodiment. Based on such understanding, the technical solutions of the present application can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes a plurality of instructions for making a terminal (which can be a mobile phone, computer, server, air conditioner, or network device) execute the method described in each embodiment of the present application.

[0109] The embodiments of the present application are described above with reference to the accompanying drawings, but the present application is not limited to the above-mentioned specific embodiments, and the above-mentioned specific embodiments are only illustrative, not restrictive. Those skilled in the art can make many forms under the inspiration of the present application without departing from the purpose of the present application and the scope protected by the claims.

[0110] Those skilled in the art can realize that the units and algorithm steps of each example described in combination with the embodiments disclosed in the embodiments of the present application can be realized by electronic hardware or a combination of computer software and electronic hardware. Whether the functions are realized in hardware or software depends on the specific application and design constraints of the technical solutions. Those skilled in the art can use different methods to realize the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0111] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the above-mentioned system, device and unit can refer to the corresponding process in the foregoing method embodiments, which will not be repeated here.

[0112] In the embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only illustrative, for example, the division of the units is only a logical function division, and actual implementation can have another division manner, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the displayed or discussed units can be indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0113] The units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed on multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiment scheme.

[0114] In addition, each functional unit in each embodiment of the present application can be integrated in one processing unit, or each unit can be physically present alone, or two or more units can be integrated in one unit.

[0115] If the functions are realized in the form of software functional units and sold or used as independent products, they can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present application or the part of the prior art that essentially contributes to the prior art or the part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes various storage media that can store program codes, such as U disk, mobile hard disk, ROM, RAM, magnetic disk or optical disk.

[0116] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A urea injection control method, characterized in that: include: When the heating component integrated on the urea pump is in an operating state and a urea injection request is received, obtaining the total amount of liquid urea in the urea tank and the requested urea amount carried in the urea injection request; determining a target urea amount according to the total amount of liquid urea, the requested urea amount, and a preset threshold, wherein the preset threshold is a minimum total amount of liquid urea used for heat conduction during operation of the heating component; The urea pump is controlled to inject urea at the target urea amount.

2. The urea injection control method according to claim 1, characterized in that: Determining a target urea amount according to the total amount of liquid urea, the requested urea amount, and a preset threshold value includes: calculating a first urea amount, wherein the first urea amount is equal to a difference between the total amount of liquid urea and the requested urea amount; When the first urea amount is greater than or equal to the preset threshold, determining the requested urea amount as the target urea amount; When the first urea amount is less than the preset threshold, a second urea amount is calculated, wherein the second urea amount is equal to the difference between the total amount of liquid urea and the preset threshold, and the second urea amount is determined as the target urea amount.

3. The urea injection control method according to claim 1, characterized in that: The method further comprises: After the vehicle is started, obtain the ambient temperature and urea tank temperature; determining whether a preset heating condition corresponding to the heating component is satisfied according to the ambient temperature and the urea tank temperature; When the preset heating condition is met, the heating component is controlled to enter a working state.

4. The urea injection control method according to claim 1, characterized in that: The method further comprises: When the heating component enters the working state, the target thawing time is determined according to the ambient temperature and the urea tank temperature; At the end time corresponding to the target thawing time, the urea pump is controlled to start building pressure, and a reminder signal is sent to the engine electronic control unit, wherein the reminder signal is used to prompt the engine electronic control unit to start building pressure of the urea pump.

5. The urea injection control method according to claim 1, characterized in that: Get the total amount of liquid urea in the urea tank, including: determining the total amount of thawed urea according to the corresponding working time of the heating component and the corresponding thawing efficiency of the heating component; Obtaining the total amount of urea injected corresponding to the urea pump; The total amount of liquid urea in the urea tank is determined according to the total amount of thawed urea and the total amount of injected urea.

6. The urea injection control method according to claim 3, characterized in that: Judging whether a preset heating condition corresponding to the heating component is satisfied according to the ambient temperature and the urea tank temperature includes: When the ambient temperature is lower than a first temperature threshold and / or the urea tank temperature is lower than a second temperature threshold, it is determined that the preset heating condition is met.

7. The urea injection control method according to claim 4, characterized in that: Determine the target thawing time based on the ambient temperature and urea tank temperature, including: Determining a first thawing time corresponding to the ambient temperature according to a pre-stored correspondence between the ambient temperature and the thawing time; determining a second thawing time corresponding to the urea tank temperature according to a pre-stored correspondence between the urea tank temperature and the thawing time; The longer one of the first thawing time period and the second thawing time period is determined as the target thawing time period.

8. A urea injection control device, characterized in that: include: a first acquisition module, configured to acquire, when the heating assembly integrated in the urea pump is in an operating state and a urea injection request is received, a total amount of liquid urea in the urea tank and a requested urea amount carried in the urea injection request; a first determining module, configured to determine a target urea amount according to the total amount of liquid urea, the requested urea amount, and a preset threshold, wherein the preset threshold is a minimum total amount of liquid urea used for heat conduction during operation of the heating component; The first control module is configured to control the urea pump to inject urea at the target urea amount.

9. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the urea injection control method according to any one of claims 1 to 7 are implemented.

10. A vehicle, characterized in that: The invention comprises a processor, a memory and a computer program stored in the memory and executable on the processor, wherein the computer program implements the urea injection control method according to any one of claims 1 to 7 when executed by the processor.

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