A control method, a control system, a storage medium and a vehicle of a urea system

Abstract

The application provides a control method and system of a urea system, a storage medium and a vehicle, and belongs to the technical field of vehicles. The control method of the urea system comprises the following steps: when the ambient temperature around the vehicle and / or the urea temperature is less than a first preset temperature, the inclination direction of a urea tank body is obtained; based on the inclination direction, a target heating module for heating urea is determined; and the target heating module is started to heat the urea, so that at least the urea located at a position with a height lower than a preset height in the urea tank body is heated. The inclination direction indicates the accumulation position of the urea in the urea tank body, and the urea accumulation position is a position with a large heat demand in the urea tank body, so that the target heating module determined based on the inclination direction can supply more heat to the position with a large heat demand, thereby heating the urea located at a position with a height lower than a preset height in the urea tank body in a targeted manner, making the melting speed of the urea in the urea tank body more uniform, and improving the urea melting efficiency.

Description

TECHNICAL FIELD

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

[0002] The urea system is a kind of exhaust aftertreatment device installed on diesel vehicle, including urea tank storing urea, urea injection unit, etc. Due to the characteristics of low melting point and easy freezing of urea solution, a urea heating module is also provided in part of the urea system to melt the condensed urea.

[0003] In the related art, the heating module is arranged at the suction port of the urea pump. However, when the vehicle is parked or travels on an inclined road, the urea will condense and accumulate in a corner position of the urea tank. At this time, if the heating module arranged at the suction port of the urea pump is used to heat the urea, since the heating device is located at the middle position of the urea tank, and the heat obtained by the urea decreases as the distance from the heating device increases, therefore in this case, the part of the urea with large amount of accumulation and large amount of heat demand obtains less heat, so that the melting speed of the urea close to the heating device is much faster than that of the urea far away from the heating device, the melting speed of the urea in the urea tank is uneven, and finally the melting efficiency of the urea is too low. SUMMARY

[0004] Therefore, the present application provides a control method and system of a urea system, a storage medium and a vehicle to solve the problem of how to improve the melting efficiency of urea.

[0005] In a first aspect, the present application provides a control method of a urea system, characterized in that the urea system comprises a urea tank and a plurality of heating modules arranged at different positions in the urea tank, wherein the plurality of heating modules at least comprises a first heating module arranged at the suction port of the urea pump, and the method comprises:

[0006] When the ambient temperature around the vehicle and / or the urea temperature is less than a first preset temperature, the inclination direction of the urea tank is obtained;

[0007] Based on the inclination direction, a target heating module for heating the urea is determined; wherein the target heating module at least comprises the first heating module;

[0008] The target heating module is started to heat the urea, so that at least the urea located at a position with a height lower than a preset height in the urea tank is heated.

[0009] Optionally, the preset height is a height of a position where the first heating module is located, the plurality of heating modules further include a second heating module whose position height is higher than the preset height, and a third heating module whose position height is lower than the preset height; and the target heating module for heating the urea based on the tilt direction includes:

[0010] determining the first heating module, the second heating module, and the third heating module as the target heating module for heating the urea;

[0011] the starting the target heating module to heat the urea includes:

[0012] determining a heating duration corresponding to each of the target heating modules based on a current temperature corresponding to the urea system; wherein the heating duration of the second heating module is less than the heating duration of the first heating module and the third heating module, and the current temperature includes the ambient temperature and the urea temperature;

[0013] heating the urea according to the heating duration corresponding to each of the target heating modules.

[0014] Optionally, the determining the heating duration corresponding to each of the target heating modules based on the current temperature corresponding to the urea system includes:

[0015] determining a temperature difference between the current temperature and a melting point of the urea;

[0016] determining the heating duration of the target heating module based on the temperature difference;

[0017] wherein the heating duration and the temperature difference are in a positive correlation.

[0018] Optionally, the method further includes:

[0019] obtaining a volume of urea in the urea tank and an inclination angle of the urea tank;

[0020] the determining the target heating module for heating the urea based on the tilt direction includes:

[0021] determining the target heating module based on the volume of urea, the inclination angle, and the tilt direction.

[0022] Optionally, the determining the target heating module based on the volume of urea, the inclination angle, and the tilt direction includes:

[0023] In a case that the volume of the urea is less than or equal to the preset volume and the inclination angle is greater than the preset angle, the target heating module is determined based on the inclination direction;

[0024] In a case that the volume of the urea is greater than the preset volume and / or the inclination angle is less than or equal to the preset angle, the target heating module is determined based on a current temperature corresponding to the urea system;

[0025] The current temperature includes the ambient temperature and the urea temperature.

[0026] Optionally, the determination of the target heating module based on the current temperature corresponding to the urea system comprises:

[0027] The urea demand of the vehicle is acquired;

[0028] The target heating module is determined based on the current temperature and the urea demand.

[0029] Optionally, the determination of the target heating module based on the current temperature and the urea demand comprises:

[0030] In a case that the current temperature satisfies a preset condition and the urea demand is less than or equal to a preset demand, the first heating module is determined as the target heating module;

[0031] In a case that the current temperature does not satisfy the preset condition and / or the urea demand is greater than the preset demand, a plurality of the heating modules are determined as the target heating module;

[0032] The preset condition is that the ambient temperature is higher than a second preset temperature or the urea temperature is higher than a third preset temperature, and the second preset temperature is lower than the third preset temperature.

[0033] A second aspect of the embodiments of the present application provides a control system of a urea system, the urea system comprising a urea tank and a plurality of heating modules arranged at different positions in the urea tank, wherein the plurality of heating modules at least comprises a first heating module arranged at a suction port of a urea pump, and the control system comprises:

[0034] An acquisition module is configured to acquire an inclination direction of the urea tank when an ambient temperature around a vehicle and / or a urea temperature is less than a first preset temperature;

[0035] A decision module is configured to determine a target heating module for heating the urea based on the inclination direction, wherein the target heating module at least comprises the first heating module.

[0036] The execution module is configured to start the target heating module to heat the urea, so as to at least heat the urea located at a position with a height lower than a preset height in the urea tank.

[0037] In a third aspect, the application provides a computer readable storage medium, which stores a computer program. The computer program is executed by a processor to implement the steps of the control method of the urea system according to the first aspect.

[0038] In a fourth aspect, the application provides a vehicle comprising the control system of the urea system according to the second aspect, or comprising a control module configured to implement the steps of the control method of the urea system according to the first aspect.

[0039] The application provides a control method, a control system, a storage medium and a vehicle for a urea system. The method comprises: when an ambient temperature around the vehicle and / or a urea temperature is less than a first preset temperature, obtaining a tilting direction of the urea tank; determining a target heating module for heating the urea based on the tilting direction, wherein the target heating module at least comprises the first heating module; and starting the target heating module to heat the urea, so as to at least heat the urea located at a position with a height lower than a preset height in the urea tank.

[0040] The application provides a control method, a control system, a storage medium and a vehicle for a urea system. The method comprises: when an ambient temperature around the vehicle and / or a urea temperature is less than a first preset temperature, obtaining a tilting direction of the urea tank; determining a target heating module for heating the urea based on the tilting direction, wherein the target heating module at least comprises the first heating module; and starting the target heating module to heat the urea, so as to at least heat the urea located at a position with a height lower than a preset height in the urea tank. BRIEF DESCRIPTION OF DRAWINGS

[0041] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the description of the embodiments of the application. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0042] Figure 1 is a structural schematic diagram of a urea system provided by the embodiments of the application, which is provided with one heating module;

[0043] Figure 2 This is a step diagram of a control method for a urea system provided in an embodiment of the present application;

[0044] Figure 3 1 is a schematic structural diagram of a urea system provided with multiple heating modules according to an embodiment of the present application;

[0045] Figure 4 This is a step diagram of a control method for a urea system based on an inclined direction provided in an embodiment of the present application;

[0046] Figure 5 This is a step diagram of a method for determining heating time provided in an embodiment of the present application;

[0047] Figure 6 This is a relationship diagram between heating time and current temperature provided in an embodiment of the present application;

[0048] Figure 7 This is a step diagram of a control method for a urea system based on urea volume and tilt angle provided in an embodiment of the present application;

[0049] Figure 8 This is a step diagram of a method for determining a target heating module based on the current temperature provided by an embodiment of the present application;

[0050] Figure 9 This is a flow chart of a control method for a urea system provided in an embodiment of the present application;

[0051] Figure 10 Schematic diagram of the structure of a control system of a urea system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0052] The following will be combined with the accompanying drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0053] like Figure 1 The structural diagram of a urea system equipped with a heating module is shown in FIG. The urea system includes a urea tank, a urea pump, a urea delivery pipe, a urea nozzle, and a urea filling pipe. In addition, a heating module is provided at the suction port of the urea pump to heat the condensed urea in the urea tank. Figure 1When the urea tank body is inclined towards the urea filling pipe, the urea will condense and accumulate on one side of the urea tank body close to the filling pipe. At this time, the heating device is turned on to heat the condensed urea. Since the heating device is located at the middle position of the urea tank body, and the heat obtained by the urea decreases as the distance between the urea and the heating device increases, in this case, the part of the urea with a large amount of accumulation and a large amount of heat demand obtains less heat, so that the melting speed of the urea close to the heating device is much faster than that of the urea away from the heating device, the melting speed of the urea in the urea tank body is uneven, and finally the melting efficiency of the urea is too low.

[0054] Based on this, in order to solve the problem of how to improve the melting efficiency of urea, the application provides a control method, a control system, a storage medium and a vehicle. The application sets heating modules at different positions in the urea tank body, and when the ambient temperature and / or the urea temperature is less than a first preset temperature, determines a target heating module from the plurality of heating modules based on the inclination direction of the urea tank body, and then heats the urea close to the inclination direction in the urea tank body. The inclination direction indicates the accumulation position of the urea in the urea tank body, and the urea accumulation position is the position with a large amount of heat demand in the urea tank body, so that the target heating module determined based on the inclination direction can supply more heat to the position with a large amount of heat demand, and heat the urea at a position with a height lower than a preset height in the urea tank body, so that the melting speed of the urea at each position in the urea tank body is more uniform, and the melting efficiency of the urea is improved. Specifically includes:

[0055] The first aspect of the application provides an embodiment, as shown in Figure 2 A control method for a urea system is shown in a flowchart, which is applied to a vehicle-mounted controller, and the main steps include:

[0056] First, referring to Figure 3 As shown in a structural schematic diagram of a urea system provided with a plurality of heating modules, Figure 3 The urea system shown includes a urea tank body, a urea pump, a urea delivery pipe, a urea nozzle, a urea filling pipe, and a plurality of heating modules arranged at different positions in the urea tank body, wherein the plurality of heating modules at least includes a first heating module arranged at the suction port of the urea pump. The heating module can be a heating rod, a heating wire or other components that can generate heat, and the application does not limit this.

[0057] Step S101, when the ambient temperature and / or the urea temperature around the vehicle is less than a first preset temperature, the inclination direction of the urea tank body is obtained.

[0058] The ambient temperature around the vehicle can be determined by a temperature sensor arranged outside the vehicle, or determined based on the vehicle position obtained by a positioning system, and weather information corresponding to the vehicle position obtained from a weather query system. The temperature of the urea can be determined by a temperature sensor arranged inside the urea tank. When the ambient temperature around the vehicle or the temperature of the urea is less than a first preset temperature, or both the ambient temperature and the temperature of the urea are less than the first preset temperature, the inclination direction of the urea tank is obtained. In an optional embodiment, the first preset temperature can be -5°C. When either or both of the ambient temperature and the temperature of the urea is less than -5°C, the inclination direction of the urea tank is obtained.

[0059] Since the relative position of the urea tank and the vehicle body is fixed, the inclination direction of the urea tank can be determined by the inclination direction of the vehicle body. The inclination direction of the vehicle body can be directly determined by a gyroscope installed on the vehicle, or indirectly determined by the height difference of the vehicle body on each axle based on height measuring devices respectively installed on each axle.

[0060] In determining the inclination direction of the urea tank, the vehicle-mounted controller can determine the inclination direction from a plurality of preset inclination directions based on the data measured by the gyroscope or the height measuring devices. For example, the data measured by the gyroscope shows that the urea tank is inclined to the rear of the vehicle by 15° to the left, and the preset inclination directions include the front of the vehicle and the rear of the vehicle. At this time, based on the data measured by the gyroscope, the inclination direction of the urea tank is determined to be the rear of the vehicle from the preset inclination directions. The directions and the number of the preset inclination directions can be determined according to the positions of the plurality of heating modules or the shape of the urea tank.

[0061] In step S102, a target heating module for heating the urea is determined based on the inclination direction. The target heating module at least includes the first heating module.

[0062] The inclination direction of the urea tank represents the position where the urea accumulates when it condenses. For example, when the inclination direction is the rear of the vehicle, or the vehicle is on an uphill road, the front end of the urea tank is higher than the rear end (the front end is the end of the urea tank close to the front of the vehicle, and the rear end is the end of the urea tank close to the rear of the vehicle), and the urea will accumulate at the lower rear end under the action of gravity. Conversely, when the inclination direction is the front of the vehicle, or the vehicle is on a downhill road, the front end of the urea tank is higher than the rear end, and the urea will accumulate at the lower front end under the action of gravity. At the same time, since the greater the volume or mass of the urea is when it condenses, the more heat is required to melt it, so the position where the urea accumulates is the position where the heat demand is large.

[0063] In summary, the inclination direction of the urea tank body not only represents the position where the urea is accumulated when the urea is condensed, but also indicates the position where the heat demand is large. The target heating module for heating the urea should be determined based on the inclination direction of the urea tank body.

[0064] In an optional embodiment, when the target heating module is determined based on the inclination direction, the first heating module and the heating module farthest from the first heating module in the inclination direction can be determined as the target heating module.

[0065] In step S103, the target heating module is started to heat the urea, so that at least the urea located at a position with a height lower than a preset height in the urea tank body is heated.

[0066] The preset height can be set according to different structures of the urea tank body. In an embodiment, the preset height can be the height corresponding to the axis of the suction port of the urea pump. Alternatively, the preset height can also be the height corresponding to the position of the first heating module. For ease of description, the part of the urea tank body higher than the preset height is referred to as the high position, and the urea located at a position with a height higher than the preset height is referred to as the high-position urea. The part of the urea tank body lower than the preset height is referred to as the low position, and the urea located at a position with a height lower than the preset height is referred to as the low-position urea.

[0067] After the target heating device is determined, the vehicle-mounted controller can send a start signal to the target heating module through the CAN (Controller Area Network) line. The target heating module starts to output heat outwardly under the drive of the start signal, so that at least the urea at the low position of the urea tank body is heated.

[0068] The present application provides multiple heating modules at different positions in the urea tank body, and when the ambient temperature and / or the urea temperature is less than a first preset temperature, a target heating module is determined from the multiple heating modules based on the inclination direction of the urea tank body, and then the urea close to the inclination direction in the urea tank body is heated. The inclination direction indicates the position where the urea is accumulated in the urea tank body, and the position where the urea is accumulated is the position where the heat demand is large in the urea tank body. Therefore, the target heating module determined based on the inclination direction can supply more heat to the position where the heat demand is large, and heat the urea located at a position with a height lower than a preset height in the urea tank body, so that the melting speed of the urea at each position in the urea tank body is more uniform, and the melting efficiency of the urea is improved.

[0069] In another embodiment of the present application, in addition to the steps in the above-mentioned embodiments, the following steps are further included:

[0070] Optionally, the preset height is a height of a position where the first heating module is located, the plurality of heating modules further include a second heating module whose position height is higher than the preset height, and a third heating module whose position height is lower than the preset height, such as Figure 4 A control method of a urea system based on a tilt direction is shown in a flowchart, and the method includes:

[0071] In step S201, the first heating module, the second heating module, and the third heating module are determined as target heating modules for heating the urea.

[0072] The heating modules include a first heating module, a second heating module, and a third heating module. The heating module whose position height is higher than the preset height is the second heating module, and the heating module whose position height is lower than the preset height is the third heating module.

[0073] To ensure that the urea at each position in the urea tank is fully heated, the first heating module, the second heating module, and the third heating module, i.e., all the heating modules in the urea tank, should be determined as target heating modules to heat the urea at a position height equal to the preset height, the urea at a position height higher than the preset height, and the urea at a position height lower than the preset height, i.e., all the urea in the urea tank.

[0074] In step S202, based on a current temperature corresponding to the urea system, a heating duration corresponding to each of the target heating modules is determined. The heating duration of the second heating module is less than the heating duration of the first heating module and the third heating module, and the current temperature includes the ambient temperature and the urea temperature.

[0075] According to the formula for calculating the specific heat capacity, the lower the urea temperature or the ambient temperature, the more heat the urea absorbs when melting. Therefore, based on the current temperature corresponding to the urea system, the heating duration corresponding to the target heating module needs to be determined.

[0076] At the same time, according to the formula for calculating the specific heat capacity, the more the amount of condensed urea, the longer the time required for melting. Therefore, considering that when the urea tank is tilted, the part of the urea tank higher than the preset height is referred to as a high position, and the part of the urea tank lower than the preset height is referred to as a low position, due to the uneven distribution of urea at the high position and the low position, the amount of urea at the high position is much smaller than the amount of urea at the low position, therefore, to adapt to the different amounts of urea at different positions of the urea tank, the heating duration of the second heating module whose position height is higher than the preset height should be less than the heating duration of the first heating module and the third heating module whose position height is lower than the preset height.

[0077] Based on the current temperature corresponding to the urea system, the heating time of each target heating module is determined, and the heating time of the second heating module at the position higher than the preset height is determined to be less than the heating time of the first heating module and the third heating module at the position lower than the preset height, which can prevent the heating module from being dry-burned for a long time after the urea is melted, and avoid damage to the heating module.

[0078] In step S203, the urea is heated according to the heating time corresponding to each target heating module.

[0079] After determining the heating time of each target heating module, the vehicle-mounted controller sends a start signal carrying the heating time of each target heating module to each target heating module. After receiving the start signal, the heating module heats for the corresponding heating time, and after heating the urea for the heating time, the heating module is turned off and stops delivering heat to the urea.

[0080] In an optional embodiment, considering the need for continuous heating at the suction port of the urea pump and at the low position of the urea tank, the heating time of the first heating module and the third heating module can be determined as positive infinity. That is, in actual use, the target heating module is turned on to heat the urea, and the second heating module is turned off after the second heating module heats the urea for the corresponding heating time.

[0081] Optionally, as Figure 5 As shown in the method step diagram for determining the heating time, step S202 of determining the heating time corresponding to each target heating module based on the current temperature corresponding to the urea system includes:

[0082] In step S2021, the temperature difference between the current temperature and the melting point of the urea is determined.

[0083] According to the formula of specific heat capacity, the greater the temperature difference between the current temperature and the melting point of the urea, the more heat is required to melt the urea, and the longer the heating time of the target heating module. Therefore, before determining the heating time of the target heating module, the temperature difference between the current temperature and the melting point of the urea should be determined first.

[0084] In step S2022, the heating time of the target heating module is determined based on the temperature difference. The heating time and the temperature difference are in a positive correlation.

[0085] After the temperature difference is determined, the heating time length can be determined based on the relationship between the temperature difference and the heating time length of the target heating module, thereby improving the adaptation degree between the heating time length and the urea and further avoiding energy waste of the target heating module. In a specific embodiment, taking urea with a melting point of -11℃ as an example, it is shown in a relationship diagram between the heating time length and the current temperature that when the current temperature is -5℃, the heating time length of the second heating module can be determined as 5 minutes. Figure 6

[0086] Optionally, as Figure 7 As shown in a control method step diagram of a urea system based on the urea volume and the inclination angle, the method comprises:

[0087] In step S301, the urea volume in the urea tank and the inclination angle of the urea tank are obtained.

[0088] The urea volume in the urea tank can be directly obtained by a liquid level sensor in the urea tank or indirectly calculated by measuring the overall mass of the urea tank. The inclination angle of the urea tank, i.e., the inclination angle of the vehicle body, or the slope of the road surface on which the vehicle is located, can be obtained by a sensor installed on the vehicle.

[0089] Considering that the melting time length of urea at each position in the urea tank is affected by the urea volume in the urea tank and the inclination angle of the urea tank in addition to the inclination direction of the urea tank, when determining the target heating module, the urea volume and the inclination angle should also be considered, thereby improving the accuracy of the determination result.

[0090] In step S302, the target heating module is determined based on the urea volume, the inclination angle and the inclination direction.

[0091] The urea volume, the inclination angle and the inclination direction jointly determine the amount of urea condensed at each position in the urea tank. For example, if the part of the urea tank higher than a preset height is referred to as a high position and the part of the urea tank lower than the preset height is referred to as a low position, when the urea tank is inclined to the rear of the vehicle, the amount of urea at the low position is more than that at the high position, and further, the greater the inclination angle of the urea tank, the greater the difference between the amounts of urea at the low position and the high position, and the greater the urea volume in the urea tank, the more heating devices can be covered by the urea after condensation.

[0092] Based on this, in an optional embodiment, the urea volume, the inclination angle and the inclination direction can be comprehensively considered to determine the amount of urea condensed at each position in the urea tank, thereby determining the target heating module.

[0093] ​Optionally, the determining the target heating module based on the urea volume, the inclination angle and the inclination direction in the step S302 comprises two cases, specifically:

[0094] In a first case, when the urea volume is less than or equal to the preset volume and the inclination angle is greater than the preset angle, the target heating module is determined based on the inclination direction.

[0095] When the urea volume is less than or equal to the preset volume, it indicates that the amount of urea left in the urea tank is small. When the inclination angle of the urea tank is greater than the preset angle, it indicates that the difference between the urea amount of the position with the largest amount of condensed urea and the position with the smallest amount of condensed urea in the urea tank is large. Therefore, when the urea volume is less than or equal to the preset volume and the inclination angle is greater than the preset angle, the urea system is actually in a case where the amount of urea in the urea tank is small and the difference between the urea amounts of different positions is large. In an optional embodiment, the preset volume can be determined according to the total volume of the urea tank, for example, the preset volume is 60% of the total volume, and the preset angle can be 5°.

[0096] In this case, since the difference between the urea amounts of different positions is large and the amount of urea is small, there may be no urea condensation in the heating range of the heating module, so as to avoid the dry burning of the heating module. Therefore, the position with urea condensation and the position without urea condensation are determined according to the inclination direction, and then the target heating module is determined.

[0097] In a second case, when the urea volume is greater than the preset volume and / or the inclination angle is less than or equal to the preset angle, the target heating module is determined based on the current temperature corresponding to the urea system, wherein the current temperature comprises the ambient temperature and the urea temperature.

[0098] The case where the urea volume is greater than the preset volume and / or the inclination angle is less than or equal to the preset angle, i.e. the case where the urea volume is greater than the preset volume, or the case where the inclination angle is less than or equal to the preset angle, or the case where the urea volume is greater than the preset volume and the inclination angle is less than or equal to the preset angle. Since when the urea volume is greater than the preset volume, it indicates that the amount of urea left in the urea tank is large, and when the inclination angle of the urea tank is less than or equal to the preset angle, it indicates that the difference between the urea amounts condensed in different positions in the urea tank is small.

[0099] Therefore, when the urea volume is greater than the preset volume, the amount of urea currently remaining in the urea tank is large, so no matter what the tilt angle of the urea tank is, there will be no situation where no urea condenses within the heating range of the heating module. When the tilt angle is less than the preset angle, the difference in the amount of urea condensed at each location within the urea tank is small, so the difference in the heating time required to melt the urea at each location is also small. When the urea volume is greater than the preset volume, or the tilt angle is less than or equal to the preset angle, or both, the urea in the urea tank is more evenly distributed at each location, and there will be no problems such as dry heating of the heating device or uneven urea melting speed at each location. Therefore, the target heating module should be determined based on the current temperature of the urea system to improve the energy efficiency of the urea system while ensuring the urea melting effect.

[0100] Alternatively, as Figure 8 As shown in the figure, a method for determining a target heating module based on a current temperature is described. In case 2 of step S302, determining the target heating module based on the current temperature corresponding to the urea system includes:

[0101] Step S3021: Obtaining the urea demand of the vehicle.

[0102] The urea demand of a vehicle refers to the amount of urea injection required by the vehicle per unit time, which can be calculated based on parameters such as engine load and speed.

[0103] Step S3022: determining the target heating module based on the current temperature and the urea demand.

[0104] The current temperature determines the total heat required to melt a unit volume of urea. Given a given total heat requirement, the more heating modules that provide heat, the shorter the urea melting time. The shorter the urea melting time, the more urea melted per unit time, better meeting the vehicle's urea demand. Therefore, to meet the vehicle's urea demand, the target heating module must be determined based on both the current temperature and the urea demand.

[0105] Optionally, the step S3022 of determining the target heating module based on the current temperature and the urea demand includes two cases, specifically:

[0106] In case 1, when the current temperature meets a preset condition and the urea demand is less than or equal to a preset demand, the first heating module is determined as the target heating module.

[0107] The preset condition is that the ambient temperature is higher than a second preset temperature, or the urea temperature is higher than a third preset temperature; and the second preset temperature is lower than the third preset temperature.

[0108] The current temperature includes the urea temperature and / or the ambient temperature around the vehicle, and the preset condition is that the ambient temperature is higher than a second preset temperature, or the urea temperature is higher than a third preset temperature. In this case, the current temperature satisfies the preset condition includes three cases: the ambient temperature is higher than the second preset temperature, the urea temperature is higher than the third preset temperature, and the ambient temperature is higher than the second preset temperature and the urea temperature is higher than the third preset temperature. Since the urea temperature is not only affected by the ambient temperature, but also affected by the heat generated by the operation of the vehicle, the ambient temperature is usually lower than the urea temperature, and therefore the second preset temperature should be lower than the third preset temperature. In an alternative embodiment, the second preset temperature can be -25℃, the third preset temperature can be -20℃, and the preset demand can be 300mg / s.

[0109] In the case that the current temperature satisfies the preset condition, and the urea demand is less than or equal to the preset demand, it indicates that the total heat required for urea melting is small, and the urea demand is also small. At this time, only the first heating module needs to be started to meet the heat demand of the urea system, so the first heating module is determined as the target heating module.

[0110] In the case that the current temperature does not satisfy the preset condition, and / or the urea demand is greater than the preset demand, the plurality of heating modules are determined as the target heating module.

[0111] In the case that the current temperature does not satisfy the preset condition, or the urea demand is greater than the preset demand, or the current temperature does not satisfy the preset condition and the urea demand is greater than the preset demand, it indicates that the heat demand of the urea system in unit time is large, so the plurality of heating modules need to be determined as the target heating module.

[0112] By combining the current temperature and the urea demand to determine the target heating module, the heat demand of the urea system in unit time can be accurately judged, and the energy utilization rate of the urea system can be improved under the premise of meeting the heat demand of the urea system.

[0113] The third aspect of the present application proposes an embodiment, as shown in Figure 9 A flowchart of a control method of a urea system is shown. The control method of the urea system is applied to the urea system, as shown in Figure 3The urea system comprises a urea tank and heating modules arranged at different positions in the urea tank, wherein the heating modules comprise a first heating module arranged at a suction port of a urea pump, a second heating module arranged at a position higher than the preset height, and a third heating module arranged at a position lower than the preset height.

[0114] The control method of the urea system comprises:

[0115] When the ambient temperature around the vehicle and / or the urea temperature is less than a first preset temperature, the inclination direction of the urea tank, the volume of urea in the urea tank, and the inclination angle of the urea tank are obtained.

[0116] When the volume of urea is less than or equal to 60% of the total volume of the urea tank and the inclination angle is greater than 5°, the first heating module, the second heating module, and the second heating module are determined as target heating modules for heating urea; the heating time of the target heating modules is determined based on the current temperature of the urea system; the heating time of the second heating module is less than the heating time of the first heating module and the third heating module; and the urea is heated according to the heating time of each target heating module.

[0117] When the volume of urea is greater than 60% of the total volume of the urea tank and / or the inclination angle is less than or equal to 5°, the urea demand of the vehicle is obtained; when the current temperature meets the preset condition and the urea demand is less than or equal to 300 mg / s, the first heating module is determined as the target heating module; when the current temperature does not meet the preset condition and / or the urea demand is greater than 300 mg / s, the first heating module, the second heating module, and the third heating module in the plurality of heating modules are determined as the target heating modules; wherein the preset condition is that the ambient temperature is higher than -25℃ or the urea temperature is higher than -20℃. The target heating module is started to heat the urea to at least heat the urea at the low position in the urea tank. Figure 3

[0118] The fourth aspect of the present application proposes an embodiment, as Figure 10 The control system of the urea system comprises a urea tank and heating modules arranged at different positions in the urea tank, wherein the heating modules comprise at least a first heating module arranged at a suction port of a urea pump, and the control system comprises:

[0119] When the ambient temperature around the vehicle and / or the urea temperature is less than a first preset temperature, the inclination direction of the urea tank is obtained by the obtaining module;

[0120] ​A decision module is configured to determine a target heating module for heating the urea based on the tilt direction, wherein the target heating module at least includes the first heating module;

[0121] A performing module is configured to start the target heating module to heat the urea, so as to at least heat the urea located at a position with a height lower than a preset height in the urea tank.

[0122] Optionally, the preset height is a height of a position where the first heating module is located, the heating modules further include a second heating module located at a position with a height higher than the preset height and a third heating module located at a position with a height lower than the preset height, and the decision module is further configured to determine the first heating module, the second heating module and the third heating module as the target heating modules for heating the urea; and the starting of the target heating module to heat the urea includes: determining a heating duration corresponding to each of the target heating modules based on a current temperature corresponding to the urea system, wherein the heating duration of the second heating module is less than the heating duration of the first heating module and the third heating module, the current temperature includes the ambient temperature and the urea temperature, and the urea is heated according to the heating duration corresponding to each of the target heating modules.

[0123] Optionally, the decision module is further configured to determine a temperature difference between the current temperature and a melting point of the urea, and determine the heating duration of the target heating module based on the temperature difference, wherein the heating duration and the temperature difference are in a positive correlation.

[0124] Optionally, the decision module is further configured to obtain a urea volume in the urea tank and an inclination angle of the urea tank, and determine the target heating module based on the urea volume, the inclination angle and the tilt direction.

[0125] Optionally, the decision module is further configured to determine the target heating module based on the tilt direction when the urea volume is less than or equal to a preset volume and the inclination angle is greater than a preset angle, and determine the target heating module based on the current temperature corresponding to the urea system when the urea volume is greater than the preset volume and / or the inclination angle is less than or equal to the preset angle, wherein the current temperature includes the ambient temperature and the urea temperature.

[0126] Optionally, the decision module is further configured to obtain a urea demand of the vehicle, and determine the target heating module based on the current temperature and the urea demand.

[0127] Optionally, the decision module is further configured to determine the first heating module as the target heating module when the current temperature satisfies a preset condition and the urea demand is less than or equal to a preset demand; and determine a plurality of the heating modules as the target heating modules when the current temperature does not satisfy the preset condition and / or the urea demand is greater than the preset demand; wherein the preset condition is that the ambient temperature is higher than a second preset temperature, or the urea temperature is higher than a third preset temperature; and the second preset temperature is lower than the third preset temperature.

[0128] The embodiment of the present application further provides a computer readable storage medium, which stores computer programs / instructions, and the computer programs / instructions are executed by a processor to realize the control method of the urea system.

[0129] The embodiment of the present application further provides a vehicle, which comprises the control system of the urea system or a control module, and the control module is configured to realize the steps of the control method of the urea system.

[0130] The embodiment of the present application provides the heating modules at different positions in the urea tank, and when the ambient temperature and / or the urea temperature is less than a first preset temperature, the target heating module is determined from the heating modules based on the tilting direction of the urea tank, and then the urea close to the tilting direction in the urea tank is heated. The tilting direction indicates the accumulation position of the urea in the urea tank, and the urea accumulation position is the position with a large heat demand in the urea tank, so that the target heating module determined based on the tilting direction can supply more heat to the position with a large heat demand, and the urea at the position with a height lower than a preset height in the urea tank is heated, so that the melting speed of the urea at each position in the urea tank is more uniform, and the melting efficiency of the urea is improved.

[0131] Each of the embodiments in the specification is described in a progressive manner, and each embodiment focuses on the difference from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0132] The computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks. Figure 1 one or more flowcharts and / or blocks Figure 1 means for functionally implementing the steps listed in the flowchart block or blocks.

[0133] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instructions which implement the function specified in the flowchart block or blocks. Figure 1 one or more flowcharts and / or blocks Figure 1 means for functionally implementing the steps listed in the flowchart block or blocks.

[0134] The computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks. Figure 1 one or more flowcharts and / or blocks Figure 1 means for functionally implementing the steps listed in the flowchart block or blocks.

[0135] While preferred embodiments of the application have been described, modifications and variations can be effected without departing from the scope of the application as set forth in the claims. Accordingly, it is to be understood that the claims are intended to cover all such modifications and variations as falling within the scope of the application.

[0136] Finally, it is to be understood that the terms such as first and second, and the like, herein are used only to distinguish one from another entity or action, and do not necessarily require or imply such actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0137] The control method of a urea system, the control system, the storage medium and the vehicle provided by the present application are described in detail above, and the principles and implementation manners of the present application are described by applying specific examples in the present article. The above description of the embodiments is only used to help understand the method of the present application and its core idea; meanwhile, for those skilled in the art, according to the idea of the present application, the specific implementation manners and application ranges will be changed, and in conclusion, the content of the present specification should not be understood as a limitation of the present application.

Claims

1. A method for controlling a urea system, characterized in that: The urea system includes: a urea tank, and heating modules arranged at multiple different positions in the urea tank, wherein the multiple heating modules include at least a first heating module arranged at a urea pump suction port. The method includes: When the ambient temperature and / or urea temperature around the vehicle is lower than a first preset temperature, obtaining the tilt direction of the urea tank; Based on the tilt direction, determining a target heating module for heating the urea; wherein the target heating module includes at least the first heating module; activating the target heating module to heat the urea so as to heat at least the urea in the urea tank that is located at a height lower than a preset height; The preset height is the height of the first heating module, and the plurality of heating modules further include a second heating module located at a height higher than the preset height, and a third heating module located at a height lower than the preset height; and determining a target heating module for heating the urea based on the tilt direction includes: determining the first heating module, the second heating module, and the third heating module as target heating modules for heating the urea; The starting the target heating module to heat the urea includes: determining heating times corresponding to the plurality of target heating modules based on a current temperature corresponding to the urea system; wherein the heating time of the second heating module is shorter than the heating time of the first heating module and the third heating module, and the current temperature includes the ambient temperature and the urea temperature; The urea is heated according to the heating time periods corresponding to the plurality of target heating modules.

2. The control method of the urea system according to claim 1, characterized in that: The determining, based on the current temperature corresponding to the urea system, the heating durations corresponding to the plurality of target heating modules includes: determining a temperature difference between the current temperature and the melting point of the urea; determining a heating time of the target heating module based on the temperature difference; The heating time is positively correlated with the temperature difference.

3. The control method of the urea system according to claim 1, characterized in that: The method further comprises: Obtaining the volume of urea in the urea tank and the inclination angle of the urea tank; The step of determining a target heating module for heating the urea based on the tilt direction includes: The target heating module is determined based on the urea volume, the tilt angle, and the tilt direction.

4. The control method of the urea system according to claim 3, characterized in that: The determining the target heating module based on the urea volume, the tilt angle, and the tilt direction includes: When the urea volume is less than or equal to a preset volume and the tilt angle is greater than a preset angle, determining the target heating module based on the tilt direction; When the urea volume is greater than the preset volume and / or the tilt angle is less than or equal to the preset angle, determining the target heating module based on the current temperature corresponding to the urea system; The current temperature includes the ambient temperature and the urea temperature.

5. The control method of the urea system according to claim 4, characterized in that: The determining the target heating module based on the current temperature corresponding to the urea system includes: obtaining a urea demand of the vehicle; The target heating module is determined based on the current temperature and the urea demand.

6. The control method of the urea system according to claim 5, characterized in that: The determining the target heating module based on the current temperature and the urea demand includes: When the current temperature satisfies a preset condition and the urea demand is less than or equal to a preset demand, determining the first heating module as the target heating module; When the current temperature does not satisfy the preset condition, and / or the urea demand is greater than the preset demand, determining the plurality of heating modules as the target heating modules; The preset condition is that the ambient temperature is higher than a second preset temperature, or the urea temperature is higher than a third preset temperature; and the second preset temperature is lower than the third preset temperature.

7. A control system for a urea system, characterized in that: The urea system includes: a urea tank, and heating modules arranged at multiple different positions in the urea tank, wherein the multiple heating modules include at least a first heating module arranged at a urea pump suction port. The control system includes: an acquisition module, configured to acquire the tilt direction of the urea tank when the ambient temperature and / or urea temperature around the vehicle is lower than a first preset temperature; a decision module, configured to determine a target heating module for heating the urea based on the tilt direction; wherein the target heating module includes at least the first heating module; an execution module, configured to start the target heating module to heat the urea, so as to heat at least the urea in the urea tank that is located at a height lower than a preset height; The preset height is the height of the first heating module. The multiple heating modules also include a second heating module located at a height higher than the preset height, and a third heating module located at a height lower than the preset height. The decision module is further used to determine the first heating module, the second heating module, and the third heating module as target heating modules for heating the urea. Starting the target heating modules to heat the urea includes: determining heating times corresponding to the multiple target heating modules based on the current temperature corresponding to the urea system; wherein the heating time of the second heating module is less than the heating time of the first heating module and the third heating module, and the current temperature includes the ambient temperature and the urea temperature; and heating the urea according to the heating times corresponding to the multiple target heating modules.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the control method of the urea system according to any one of claims 1 to 6 are implemented.

9. A vehicle, characterized in that: A control system comprising the urea system as claimed in claim 7, or a control module, wherein the control module is used to implement the steps of the control method of the urea system according to any one of claims 1 to 6.

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