Urea injection control method and device, storage medium and vehicle

Abstract

The invention provides a urea injection control method and device, a storage medium and a vehicle. The urea injection control method comprises the steps that when a heating assembly integrated on a urea pump is in a working state and receives a urea injection request, the total amount of liquid urea in a urea box and the amount of requested urea carried in the urea injection request are obtained; according to the total amount of the liquid urea, the requested urea amount and a preset threshold value, the target urea amount is determined, and the preset threshold value is the minimum total amount of the liquid urea used for heat conduction in the working process of the heating assembly; and controlling the urea pump to spray urea according to the target urea amount. According to the urea spraying method and the urea spraying device, urea spraying is performed according to the target urea amount instead of the requested urea amount carried in the urea spraying request, and determination of the target urea amount is combined with the total liquid urea amount, the requested urea amount and the preset threshold value; therefore, the problem that the thawing efficiency of the frozen urea is reduced due to the fact that air serves as a heat transfer medium can be avoided.

Description

Technical Field

[0001] The present application relates to the field of automobile technology, and in particular to a urea injection control method, device, storage medium and vehicle. Background Art

[0002] With increasingly stringent emission regulations, diesel passenger cars have adopted the diesel engine selective catalytic reduction (SCR) after-treatment system to meet the emission requirements of NOx in exhaust gas. The SCR after-treatment system can reduce NOx emissions to below the regulatory limit. The diesel engine SCR after-treatment system uses a urea pump to transport the urea solution in the urea tank to the nozzle through the urea delivery pipe, thereby controlling the urea nozzle to open according to the urea injection request signal issued by the engine electronic control unit (ECU), spraying urea solution into the mixing chamber, and realizing timed and quantitative urea injection to reduce NOx in exhaust gas.

[0003] Since urea solution begins to freeze when the ambient temperature is below -11°C, in cold areas in winter, after the vehicle is started, the heating component integrated in the urea pump starts to work to thaw the frozen urea into liquid urea and transport it to the nozzle. However, due to the limitation of the urea pump heating component, only the frozen urea around the urea pump can be thawed, and the thawing efficiency decreases with the decrease of liquid urea amount, resulting in reduced urea utilization in the urea tank. Summary of the invention

[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 is frozen in the urea tank.

[0005] In a first aspect, an embodiment of the present application provides a urea injection control method, the method comprising:

[0006] When the heating component integrated on the urea pump is in 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;

[0007] 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;

[0008] The urea pump is controlled to inject urea at the target urea amount.

[0009] In a second aspect, an embodiment of the present application further provides a urea injection control device, the device comprising:

[0010] a first acquisition module, configured to acquire the total amount of liquid urea in the urea tank and the requested urea amount carried in the urea injection request when the heating assembly integrated on the urea pump is in a working state and a urea injection request is received;

[0011] a first determination 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;

[0012] The first control module is used to control the urea pump to inject urea at the target urea amount.

[0013] In a third aspect, an embodiment of the present application further provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the above-mentioned urea injection control method is implemented.

[0014] In a fourth aspect, an embodiment of the present application provides a vehicle, comprising a processor, a memory, and a computer program stored in the memory and executable on the processor, wherein the computer program implements the above-mentioned urea injection control method when executed by the processor.

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

[0016] According to the technical solution of the embodiment of the present application, when the urea injection control unit (DCU) detects that the heating component integrated on the urea pump is in the working state, when receiving the urea injection request, it does not directly inject urea with the requested urea amount carried in the urea injection request, but needs to determine a target urea amount and control the urea pump to inject urea 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 minimum total amount of liquid urea used for heat conduction during the operation of the heating component, i.e., the preset threshold value, after the urea is injected 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 component to the frozen urea, thereby avoiding the problem of reduced thawing efficiency of the frozen urea caused by the air being used as the 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 the liquid urea can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0018] Figure 1 It is a flow chart of a urea injection control method provided in an embodiment of the present application;

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

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

[0021] Figure 4 A schematic diagram of the structure of a vehicle provided in an embodiment of the present application. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

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

[0024] In the various embodiments of the present application, it should be understood that the size of the serial numbers of the following processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0025] like Figure 1 As shown, an embodiment of the present application provides a urea injection control method, the method comprising:

[0026] Step 101 : when the heating assembly integrated on the urea pump is in 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 in the embodiment of the present application is applied to a urea injection control unit (DCU), such as 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 to the engine ECU 202 through a wiring harness 203. The urea DCU 201 is also connected to the urea pump 205 in the urea tank 204 through the wiring harness 203. When the urea DCU 201 receives a urea injection request sent by the engine ECU 202, 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. The urea nozzle 207 is controlled to open to spray urea solution into the mixing chamber 208, so as to reduce NOx in the exhaust gas. In addition, the urea injection control system further includes a urea filling pipe 209 arranged on the urea tank 204. The first end of the urea filling pipe 209 is connected to the urea tank 204, and the second end is used to fill the urea solution into the urea tank 204. A filling port cover 210 is arranged at the second end. When the urea solution needs to be added, the filling port 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, a heating component 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 by the heating component to melt it into liquid urea, so that the urea solution can be sprayed into the mixing chamber when a urea injection request from the engine ECU is received.

[0029] Specifically, during the operation of the heating component, the frozen urea around the heating component is heated and melted into liquid, and then the area around the heating component is liquid urea. The heat energy generated by the heating component is transferred to the frozen urea via the liquid urea to realize the conversion of the frozen urea into liquid urea. That is to say, the liquid urea in the urea tank not only has the function of being pressurized and injected into the mixing chamber by the urea pump to reduce NOx in the exhaust gas when there is an injection demand, but also has the function of transferring heat. Therefore, when the heating component is in working state, when a urea injection request sent by the engine ECU is detected, it is necessary to obtain the total amount of liquid urea in the urea tank and the requested urea amount carried in the urea injection demand.

[0030] Step 102: 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.

[0031] Specifically, the embodiment of the present application pre-sets the minimum total amount of liquid urea used for heat conduction during the operation of the heating component, that is, the preset threshold value. It should be noted that when the total amount of liquid urea in the urea tank is less than the preset threshold value, at least part or all of the heat generated by the heating component will be transferred to the frozen urea through the air. Compared with the direct transfer to the frozen urea through the liquid urea, the amount of frozen urea melted per unit time will be greatly reduced, thereby affecting the melting efficiency of the frozen urea. The preset threshold value can be calibrated according to experiments. For example, by gradually increasing the amount of liquid urea and detecting the melting speed of the frozen urea, the melting speed will increase with the increase of the amount of liquid urea. When the amount of liquid urea increases to a certain amount, the melting speed will no longer increase. The urea amount can be determined as the preset threshold value, and the present application does not make specific restrictions.

[0032] After obtaining the total amount of liquid urea in the urea tank and the requested urea amount in the urea injection request, the target urea amount can be determined in combination with the preset threshold value. The target urea amount is the maximum urea amount that can be injected by the current urea pump determined by the urea DCU.

[0033] Step 103: Control 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 with the target urea amount.

[0035] In the embodiment of the present application, when the urea DCU detects that the heating component integrated on the urea pump is in a working state, when receiving a urea injection request, it does not directly inject urea with the requested urea amount carried in the urea injection request, but needs to determine a target urea amount and control the urea pump to inject urea 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 minimum total amount of liquid urea used for heat conduction during the operation of the heating component, that is, the preset threshold, after the urea is injected 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 component to the frozen urea, thereby avoiding the problem of reduced thawing efficiency of the frozen urea caused by air being used as a heat transfer medium. In addition, since part of the liquid urea thawed 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 the liquid urea can also be improved.

[0036] In an optional embodiment of the present application, determining a target urea amount according to the total amount of liquid urea, the requested urea amount and a preset threshold value includes:

[0037] 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;

[0038] When the first urea amount is greater than or equal to the preset threshold, determining the requested urea amount to be the target urea amount;

[0039] 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 a difference between the total amount of liquid urea and the preset threshold, and the second urea amount is determined as the target urea amount.

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

[0041] When the first urea amount is greater than or equal to the preset threshold, it indicates that urea injection is performed with the requested urea amount, and the remaining liquid urea in the urea tank is greater than or equal to the preset threshold, so it will not affect the melting efficiency of frozen urea. At this time, urea injection can be performed with 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, it indicates that urea injection is performed with the requested urea amount, and the remaining liquid urea in the urea tank is less than the preset threshold. At this time, it is necessary to control the urea injection amount, that is, to limit the urea injection amount, to ensure that the remaining liquid urea in the urea tank is redundant or equal to the preset threshold, so as to avoid the problem of reduced thawing efficiency of frozen urea caused by air as a heat transfer medium. Specifically, the second urea amount can be calculated, wherein the second urea amount is 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.

[0043] In the above embodiment of the present application, when determining the target urea amount, the first urea amount is calculated, and by comparing the first urea amount with a preset threshold, it is determined whether the urea injection amount needs to be controlled so that the remaining liquid urea in the urea tank is redundant or equal to the preset threshold, so as to avoid the problem of reduced thawing efficiency of frozen urea caused by air being used as a heat transfer medium.

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

[0045] After the vehicle is started, obtain the ambient temperature and urea tank temperature;

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

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

[0048] Specifically, after the vehicle is started, the urea DCU is awakened, and the urea DCU monitors the ambient temperature and the urea tank temperature through the temperature sensor. According to the ambient temperature and the urea tank temperature, it can be determined whether the heating component meets the preset heating conditions. When the preset heating conditions are met, the heating component is controlled to enter the working state to defrost the frozen urea in the urea tank.

[0049] It should be noted that whether the urea in the urea tank freezes is determined by the ambient temperature and the urea tank temperature. Generally, when the ambient temperature is below -11 degrees Celsius, the urea begins to freeze. However, considering that the temperature of the urea tank is higher than the ambient temperature, the temperature in the urea tank needs to be tested. In cold areas in winter, in order to prevent the urea pump from being unable to transport urea to the urea nozzle due to urea freezing, a heating component needs to be integrated on the urea pump to thaw the frozen urea.

[0050] In the above implementation scheme of the present application, after the vehicle is started, the ambient temperature and the temperature of the urea tank are detected, so that the heating component can be turned on in time when the urea is frozen to thaw the frozen urea, thereby avoiding the situation where the urea cannot be delivered to the urea nozzle.

[0051] In an optional embodiment of the present application, judging whether a preset heating condition corresponding to the heating component is met according to the ambient temperature and the urea tank temperature includes:

[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 judging whether the preset heating condition corresponding to the heating component is met based on 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 a urea solution with a standard concentration (32.5%) begins to freeze below minus 11°C. Considering that the concentration of the urea solution will affect the freezing temperature of the urea solution (as the concentration decreases, the freezing point increases), the first temperature threshold and the second temperature threshold need to be set to a temperature value higher than minus 11°C. For example, the first temperature threshold and the second temperature threshold can be set to a value between minus 5°C and minus 10°C.

[0055] In the above implementation scheme of the present application, by comparing the ambient temperature with the first temperature threshold and comparing the urea tank temperature with the second temperature threshold, it can be determined whether the urea in the urea tank is frozen, and then whether the preset heating conditions corresponding to the heating component are met. It is only necessary to monitor the temperature collected by the temperature sensor to determine whether the preset heating conditions are met.

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

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

[0058] 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.

[0059] Specifically, when the vehicle is started and the heating component enters the working state, the frozen urea in the urea tank begins to thaw, and the liquid urea in the urea tank begins to increase. However, the urea pump can only start to build pressure when the liquid urea reaches a certain amount. Therefore, it is also necessary to determine the time when the urea pump starts to build pressure.

[0060] In the embodiment of the present application, after the ambient temperature and the urea tank temperature are acquired, the target thawing time for the thawing liquid to reach the target value can be determined according to the ambient temperature and the urea tank temperature. At the end of the target thawing time, the liquid urea in the urea tank reaches the target value and satisfies the pressure building condition. At this time, the urea pump can be controlled to start building pressure, and a reminder signal can be sent to the electric unit of the engine to prompt the engine electronic control unit that the urea pump starts building pressure. Then, after determining the urea request amount, the engine electronic control unit can send a urea request signal carrying the urea request amount to the urea DCU.

[0061] In the above-mentioned implementation scheme of the present application, by determining the target thawing time, the urea pump can be controlled to start building pressure at the end of the target thawing time, 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 receiving the reminder signal, thereby avoiding the situation where the urea pump receives the urea request signal when the pressure is not built up and cannot respond to the request signal.

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

[0063] Determining a first thawing time corresponding to the ambient temperature according to a pre-stored correspondence between the ambient temperature and the thawing time;

[0064] 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;

[0065] The larger one of the first thawing time period and the second thawing time period is determined as the target thawing time period.

[0066] Specifically, when determining the target thawing time, a first thawing time corresponding to the ambient temperature can be determined based on a pre-stored correspondence between the ambient temperature and the thawing time, and a second thawing time corresponding to the urea tank temperature can be determined based on a pre-stored correspondence between the urea tank temperature and the thawing time. After obtaining the first thawing time and the second thawing time, the larger time is determined as the target thawing time.

[0067] It should be noted that the above-mentioned pre-stored correspondence between ambient temperature and thawing time and the pre-stored correspondence between urea tank temperature and thawing time are correspondences between the thawing times of liquid urea reaching the target value when thawed at different ambient temperatures and urea tank temperatures pre-calibrated through experiments.

[0068] The above implementation scheme of the present application can determine the first thawing time and the second thawing time by looking up a table after detecting the ambient temperature and the urea tank temperature, and then obtain the target thawing time, so as to control the urea pump to start building pressure at the end of the target thawing time.

[0069] In an optional embodiment of the present application, obtaining the total amount of liquid urea in the urea tank includes:

[0070] Determining the total amount of thawed urea according to the working time corresponding to the heating component and the thawing efficiency corresponding to the heating component;

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

[0072] 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.

[0073] Specifically, when obtaining the total amount of liquid urea in the urea tank, since the urea tank includes 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 component starts working, the urea tank is full of frozen urea, and the amount of liquid urea is 0. As the heating component works, the frozen urea is melted into liquid urea. The total amount of urea melted after the heating component starts working, that is, the total amount of thawed urea, can be obtained through the working time of the heating component and the thawing efficiency corresponding to the heating component. After the vehicle is started, the urea DCU will receive the urea request signal sent by the engine ECU, and control 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 that has been sprayed by the urea pump can be obtained. After determining the total amount of thawed urea and the total amount of sprayed urea, 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] In the above embodiment of the present application, when determining the total amount of liquid urea in the urea tank, since the urea in the urea tank is not completely thawed into liquid urea and a part of it is frozen urea, the total amount of liquid urea cannot be directly determined, but 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 injected urea. Then, when a urea request signal is received, it can be determined based on the total amount of liquid urea whether urea injection can be performed with the urea request amount carried in the urea request signal, so as to avoid the situation where the remaining urea in the urea tank is insufficient for heat transfer, thereby reducing the thawing efficiency.

[0075] The urea injection control method provided in the embodiment of the present application is introduced above. The urea injection control device provided in the embodiment of the present application will be introduced below with reference to the accompanying drawings.

[0076] like Figure 3 As shown, an embodiment of the present invention further provides a urea injection control device, the device comprising:

[0077] The first acquisition module 301 is used to acquire the total amount of liquid urea in the urea tank and the requested urea amount carried in the urea injection request when the heating component integrated in the urea pump is in working state and a urea injection request is received;

[0078] A first determination module 302 is used 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;

[0079] The first control module 303 is used to control the urea pump to inject urea at the target urea amount.

[0080] Optionally, the first determining module includes:

[0081] a calculation submodule, configured to calculate 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;

[0082] a first determining submodule, configured to determine that the requested urea amount is the target urea amount when the first urea amount is greater than the preset threshold;

[0083] The second determination submodule is used to calculate a second urea amount when the first urea amount is less than the preset threshold, wherein the second urea amount is equal to the difference between the total amount of liquid urea and the preset threshold, and determine the second urea amount as the target urea amount.

[0084] Optionally, the device further comprises:

[0085] The second acquisition module is used to obtain the ambient temperature and the urea tank temperature after the vehicle is started;

[0086] A judging module, used for judging whether a preset heating condition corresponding to the heating component is met according to the ambient temperature and the urea tank temperature;

[0087] The second control module is used to control the heating component to enter a working state when the preset heating condition is met.

[0088] Optionally, the device further comprises:

[0089] A second determination module is used to determine a target thawing time according to the ambient temperature and the urea tank temperature when the heating component enters a working state;

[0090] The control sending module is used to control the urea pump to start pressure building at the end time corresponding to the target thawing time, and send a reminder signal to the engine electronic control unit, wherein the reminder signal is used to prompt the engine electronic control unit that the urea pump starts pressure building.

[0091] Optionally, the first acquisition module includes:

[0092] A third determination submodule is used to determine the total amount of thawed urea according to the working time corresponding to the heating component and the thawing efficiency corresponding to the heating component;

[0093] An acquisition submodule, used for acquiring the total amount of urea injected corresponding to the urea pump;

[0094] The fourth determining submodule is configured to 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.

[0095] Optionally, the judging module is further used for:

[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 includes:

[0098] a fifth determining submodule, configured to determine a first thawing time corresponding to the ambient temperature according to a pre-stored correspondence between the ambient temperature and the thawing time;

[0099] a sixth determining submodule, configured to determine 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;

[0100] The seventh determining submodule is configured to determine the larger time period between the first thawing time period and the second thawing time period as the target thawing time period.

[0101] The urea injection control device provided by the present application, when the urea DCU detects that the heating component integrated on the urea pump is in the working state, when receiving the urea injection request, it does not directly perform urea injection with the requested urea amount carried in 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 amount of liquid urea, the requested urea amount and the minimum total amount of liquid urea used for heat conduction during the operation of the heating component, that is, the preset threshold value, after the urea is injected 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 component to the frozen urea, which can avoid the problem of reduced thawing efficiency of the frozen urea caused by air being used as the heat transfer medium. In addition, since part of the liquid urea thawed 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 the liquid urea can also be improved.

[0102] The embodiment of the present application also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, each process of the above-mentioned urea injection control method embodiment is implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0103] The embodiment of the present application also provides a vehicle, including: a processor, a memory, and a computer program stored in the memory and executable on the processor. When the computer program is executed by the processor, the various processes of the above-mentioned urea injection control method embodiment are implemented, and the same technical effect can be achieved. To avoid repetition, it will not be described here.

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

[0105] like Figure 4 As shown, the vehicle may 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 communicate with each other through the communications bus 440. The processor 410 may call the logic instructions in the memory 430, and the processor 410 is used to perform the following steps: when the heating component integrated on the urea pump is in 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; according to the total amount of liquid urea, the requested urea amount and a preset threshold, a target urea amount is determined, wherein the preset threshold is the minimum total amount of liquid urea used for heat conduction during the working process of the heating component; and the urea pump is controlled to inject urea with the target urea amount.

[0106] In addition, the logic instructions in the above-mentioned memory 430 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art, and the computer software product is stored in a storage medium, including several instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a disk or an optical disk.

[0107] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0108] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, a magnetic disk, or an optical disk), and includes a number of instructions for enabling a terminal (which can be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to execute the methods described in each embodiment of the present invention.

[0109] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation modes, which are merely illustrative rather than restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, all of which are within the protection of the present invention.

[0110] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed in the embodiments of the present invention can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0111] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and 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 schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0113] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0114] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0115] If the functions are implemented 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 solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: various media that can store program codes, such as USB flash drives, mobile hard disks, ROM, RAM, magnetic disks, or optical disks.

[0116] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on 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 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; 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 to be 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 a 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; According to the ambient temperature and the urea tank temperature, determining whether a preset heating condition corresponding to the heating component is met; 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 working time corresponding to the heating component and the thawing efficiency corresponding to the heating component; Obtaining a 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 met 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 larger 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 the total amount of liquid urea in the urea tank and the requested urea amount carried in the urea injection request when the heating assembly integrated on the urea pump is in a working state and a urea injection request is received; a first determination 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 used 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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