Method, device, vehicle and storage medium for controlling coolant flow

Abstract

The application provides a method, device, vehicle and storage medium for controlling the flow of coolant. In the control process of maintaining the actual intake temperature of the intake manifold at the target intake temperature, the method considers the influence of the current temperature of the low-temperature radiator on the first duty cycle of the electric pump. This is because the current temperature can affect the intake temperature, and the duty cycle of the electric pump can adjust the flow of coolant, thereby affecting the intake temperature. Therefore, the method can determine the first duty cycle of the electric pump by the current temperature of the low-temperature radiator and the actual intake temperature of the intake manifold, so as to control the flow of coolant to maintain the target intake temperature, which simplifies the control process. The method determines the first duty cycle through a first corresponding relationship, and the vehicle can quickly determine the first duty cycle. Therefore, the vehicle in the method can quickly and accurately maintain the actual intake temperature of the intake manifold at the target intake temperature.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, and more particularly, to a method and device for controlling coolant flow, a vehicle, and a storage medium. BACKGROUND

[0002] With the development of vehicle technology, more and more hybrid vehicles enter people's lives. However, there are more and more problems related to hybrid vehicles, including the problem of controlling the intake temperature of the intake manifold of the engine in the hybrid vehicle.

[0003] In the process of controlling the intake temperature of the intake manifold of the engine to obtain a target intake temperature, the related technology is to control the intake temperature of the intake manifold by a proportional integral derivative (PID) control system. The above control method can control the intake temperature of the intake manifold of the engine to a certain extent, but the PID control system is extremely complex and often requires a long control time, thereby increasing the energy consumption of the hybrid vehicle.

[0004] Therefore, there is an urgent need for a method for controlling coolant flow to control the intake temperature of the intake manifold of the engine by adjusting the duty cycle of the electric pump, simplify the control process, and shorten the control time. SUMMARY

[0005] The present application provides a method and device for controlling coolant flow, a vehicle, and a storage medium, which can control the intake temperature of the intake manifold of the engine by adjusting the duty cycle of the electric pump, simplify the control process, and shorten the control time.

[0006] In a first aspect, a method for controlling coolant flow is provided, the method comprising: in response to a target instruction, obtaining an actual intake temperature of an intake manifold of an engine in a target vehicle and a current temperature of a low-temperature radiator in a cooling circuit of the engine, the target instruction being used to indicate that the actual intake temperature of the intake manifold is maintained at a target intake temperature; determining a first duty cycle of an electric pump in the cooling circuit based on the actual intake temperature, the current temperature, and a first correspondence relationship, the first correspondence relationship being used to indicate a correspondence relationship between a sample intake temperature of the intake manifold and a sample temperature of the low-temperature radiator and a first sample duty cycle of the electric pump when the target intake temperature is taken as a target; and controlling a flow of coolant in the cooling circuit based on the first duty cycle.

[0007] In the control process of maintaining the actual intake temperature of the intake manifold of the engine at the target intake temperature, the method considers the influence of the current temperature of the low-temperature radiator in the cooling circuit of the engine on the first duty cycle of the electric pump. This is because the current temperature of the low-temperature radiator affects the intake temperature, and the duty cycle of the electric pump can adjust the flow of the coolant, thereby affecting the intake temperature. Specifically, the current temperature of the low-temperature radiator can reflect the heat dissipation capacity of the cooling circuit of the engine. If the current temperature of the low-temperature radiator is low, it indicates that the cooling effect of the cooling circuit is good, and the low-temperature radiator can effectively take away heat through the coolant, so that the actual intake temperature of the intake manifold is more easily maintained at the target intake temperature. The electric pump can control the flow of the coolant, and therefore, the method can determine the first duty cycle of the electric pump through the current temperature of the low-temperature radiator and the actual intake temperature of the intake manifold, so as to control the flow of the coolant to maintain the actual intake temperature at the target intake temperature, which simplifies the control process. In addition, the first correspondence relationship is used to indicate the correspondence relationship between the sample intake temperature of the intake manifold and the sample temperature of the low-temperature radiator, and the first sample duty cycle of the electric pump when the target intake temperature is targeted. The method determines the first duty cycle through the first correspondence relationship, which can quickly determine the first duty cycle and shorten the control time. Therefore, the vehicle in the method can quickly and accurately maintain the actual intake temperature of the intake manifold at the target intake temperature.

[0008] In combination with the first aspect, in some possible implementation manners, based on the actual intake temperature, the current temperature, and the first correspondence relationship, the first duty cycle of the electric pump in the cooling circuit is determined, including: comparing the actual intake temperature with the plurality of sample intake temperatures in the first correspondence relationship, determining at least one candidate intake temperature matching the actual intake temperature from the plurality of sample intake temperatures; comparing the current temperature with at least one sample temperature corresponding to the at least one candidate intake temperature in the first correspondence relationship, determining a candidate temperature matching the current temperature from the at least one sample temperature; and determining the first sample duty cycle of the electric pump corresponding to the candidate temperature as the first duty cycle.

[0009] In the above technical solution, the first correspondence relationship is used to indicate the correspondence relationship between the sample intake temperature of the intake manifold and the sample temperature of the low-temperature radiator, and the first sample duty cycle of the electric pump when the target intake temperature is targeted. There can be multiple same sample intake temperatures and multiple same sample temperatures in the first correspondence relationship. For the above case, the method first determines at least one candidate intake temperature matching the actual intake temperature from the plurality of sample intake temperatures, and then determines a candidate temperature matching the current temperature from at least one sample temperature corresponding to the at least one candidate intake temperature, and then obtains the first duty cycle. The method can determine an accurate first duty cycle through the matching mode.

[0010] In a possible implementation of the first aspect and the above implementation, based on the first duty cycle, the flow rate of the coolant in the cooling circuit is controlled, including: in the case that the target vehicle is in a running state, obtaining a running speed of the target vehicle, a driving mode of the target vehicle, and an ambient temperature of an environment in which the target vehicle is located; determining a second duty cycle of the electric pump based on the running speed, the ambient temperature, and a second corresponding relationship, the second corresponding relationship being used to indicate a corresponding relationship between a sample running speed of a vehicle and a sample ambient temperature of an environment in which the vehicle is located, and a second sample duty cycle of the electric pump, when the target intake air temperature is targeted; correcting the second duty cycle based on the driving mode to obtain a first corrected duty cycle; and controlling the flow rate of the coolant based on a sum of the first duty cycle and the first corrected duty cycle.

[0011] In the above technical solution, the vehicle considers the influences of the running speed and the ambient temperature on the second duty cycle of the electric pump when the target vehicle is in a running state. This is because, in the process of controlling the intake air temperature of the intake manifold, the running speed and the ambient temperature of the target vehicle will affect the intake air temperature. In addition, the vehicle in the method also considers the influence of the driving mode of the target vehicle, corrects the second duty cycle through the driving mode to obtain the first corrected duty cycle, and then controls the flow rate of the coolant based on the sum of the first duty cycle and the first corrected duty cycle. This is because different driving modes will lead to different working states of the engine, thereby affecting the intake air temperature. Therefore, the first corrected duty cycle determined by the vehicle in the method through the above three influencing factors (the running speed, the ambient temperature, and the driving mode) is accurate, and the flow rate of the coolant can be more accurately controlled through the sum of the first duty cycle and the first corrected duty cycle, so that the actual intake air temperature of the intake manifold is maintained at the target intake air temperature.

[0012] In a possible implementation of the first aspect and the above implementation, the second duty cycle is corrected based on the driving mode to obtain the first corrected duty cycle, including: determining a correction factor based on the driving mode, the second duty cycle, and a correction corresponding relationship, the correction factor being used to correct the second duty cycle, the correction corresponding relationship being used to indicate a corresponding relationship between a sample driving mode of a vehicle and a sample correction factor when the target intake air temperature is targeted and a second sample duty cycle is corrected; and determining the first corrected duty cycle based on a product between the second duty cycle and the correction factor.

[0013] In the technical solution, when the target vehicle is in a driving state, the vehicle in the method can obtain a corresponding correction factor from the correction corresponding relationship through the driving mode, directly correct the second duty cycle based on the correction factor to obtain a first corrected duty cycle. The correction factor is determined based on the correction corresponding relationship through a matching manner, and thus the correction factor is relatively accurate, and the first corrected duty cycle is also accurate. The vehicle in the method can also quickly determine the correction factor and the first corrected duty cycle.

[0014] With reference to the first aspect and the above implementation manners, in some possible implementation manners, based on the first duty cycle, the flow rate of the cooling liquid in the cooling circuit is controlled, including: obtaining a positional relationship between an air conditioner condenser and the low-temperature radiator in the target vehicle, and a current opening degree of an active air intake grille in the cooling circuit; determining a second corrected duty cycle based on the positional relationship and the current opening degree; and controlling the flow rate of the cooling liquid based on a sum of the first duty cycle, the first corrected duty cycle, and the second corrected duty cycle, the first corrected duty cycle being determined based on a driving speed of the target vehicle, a driving mode, and an ambient temperature of an environment in which the target vehicle is located.

[0015] In the technical solution, the vehicle considers the positional relationship between the air conditioner condenser and the low-temperature radiator, and the influence of the current opening degree of the active air intake grille in the cooling circuit on the second corrected duty cycle of the electric pump. This is because, in the process of controlling the intake temperature of the intake manifold, the positional relationship between the air conditioner condenser and the low-temperature radiator, and the current opening degree of the active air intake grille can affect the intake temperature. The air conditioner condenser is used to dissipate heat of refrigerant in an air conditioning system, and the low-temperature radiator is mainly used to cool the engine coolant. If the positional relationship between the two is unreasonable, heat interference may occur. For example, if the air conditioner condenser is located on the downwind side of the low-temperature radiator and is too close, a part of the heat dissipated by the air conditioner condenser may be reabsorbed by the low-temperature radiator, which affects the efficiency of the engine cooling system and indirectly affects the intake temperature of the intake manifold. The opening degree of the active air intake grille affects the amount of air entering the cooling system. When the opening degree of the active air intake grille is large, the duty cycle of the electric pump may not need to be too high; and when the opening degree of the active air intake grille is small, a higher duty cycle of the electric pump is needed. Therefore, the vehicle in the method can determine an accurate second corrected duty cycle. In addition, the vehicle in the method can most accurately control the flow rate of the cooling liquid by summing the first duty cycle, the first corrected duty cycle, and the second corrected duty cycle, so that the actual intake temperature of the intake manifold is maintained at the target intake temperature.

[0016] In a possible implementation manner, the second correction duty ratio is determined based on the position relationship and the current opening degree, including: determining a reference duty ratio based on the current opening degree and a reference correspondence relationship, the reference correspondence relationship being used to indicate a correspondence relationship between a sample opening degree of the active grille shutter and a reference sample duty ratio of the electric pump when the target intake air temperature is targeted; in a case where the position relationship indicates that the air conditioner condenser is arranged behind the low-temperature radiator, determining a preset duty ratio as a third duty ratio; in a case where the position relationship indicates that the air conditioner condenser is arranged in front of the low-temperature radiator, determining the third duty ratio based on a working state of an air conditioner compressor in the target vehicle; and determining the second correction duty ratio as a sum of the reference duty ratio and the third duty ratio.

[0017] In the technical solution, the vehicle in the method can directly obtain a corresponding correction factor from the reference correspondence relationship based on the current opening degree of the active grille shutter, to obtain the reference duty ratio. This enables the reference duty ratio to be obtained quickly and accurately. In addition, when the air conditioner condenser is arranged behind the low-temperature radiator, the air conditioner condenser does not affect the heat dissipation capacity of the low-temperature radiator, that is, the position relationship has little effect on the intake air temperature. Therefore, when the air conditioner condenser is arranged behind the low-temperature radiator, the vehicle in the method determines the preset duty ratio as the third duty ratio. When the air conditioner condenser is arranged in front of the low-temperature radiator, the air conditioner condenser affects the heat dissipation capacity of the low-temperature radiator, and the degree of influence is related to the working state of the air conditioner compressor. Therefore, when the air conditioner condenser is arranged in front of the low-temperature radiator, the vehicle determines the third duty ratio based on the working state of the air conditioner compressor. In addition, the vehicle determines the second correction duty ratio based on a sum of the reference duty ratio and the third duty ratio, which can consider the influence of the thermal management architecture (components affecting the intake air amount, such as the air conditioner condenser, the active grille shutter, and the like) in the target vehicle on the intake air temperature of the intake manifold, and more accurately control the intake air temperature.

[0018] In a possible implementation manner, the third duty ratio is determined based on the working state of the air conditioner compressor in the target vehicle, including: in a case where the working state is a closed state, determining the preset duty ratio as the third duty ratio; and in a case where the working state is an open state, obtaining an air conditioner pressure in the air conditioning system in the target vehicle; and determining the third duty ratio based on the air conditioner pressure and a third correspondence relationship, the third correspondence relationship being used to indicate a correspondence relationship between a sample air conditioner pressure and a third sample duty ratio of the electric pump when the target intake air temperature is targeted.

[0019] In the above technical solution, when the air conditioning compressor is in the off state, the air conditioning condenser and the air conditioning compressor do not affect the heat dissipation capacity of the low-temperature radiator. In other words, this positional relationship does not significantly affect the intake air temperature. Therefore, in this method, the vehicle sets the preset duty cycle as the third duty cycle. However, when the air conditioning compressor is in the on state, the air conditioning condenser affects the heat dissipation capacity of the low-temperature radiator, the extent of which depends on the specific operating state of the air conditioning compressor. When the air conditioning compressor is operating (at different air conditioning pressures), the air conditioning condenser dissipates heat, thereby affecting the ambient air temperature. When the air conditioning condenser is positioned behind the low-temperature radiator, the cooling air passes through the low-temperature radiator before passing through the air conditioning condenser. The heat dissipated by the air conditioning condenser changes the temperature of the cooling air. Since the air surrounding the engine's intake manifold exchanges heat with the cooling air, the operating state of the air conditioning compressor affects the intake manifold's intake air temperature. Therefore, the vehicle in this method considers the effects of the air conditioning compressor's off and on states on the intake air temperature, as well as the effect of the specific opening pressure on the intake air temperature when the compressor is in the on state. This increases the accuracy of determining the third duty cycle.

[0020] In a second aspect, a device for controlling the flow of coolant is provided, which includes: an acquisition module for acquiring the actual intake temperature of the intake manifold of the engine in the target vehicle and the current temperature of the low-temperature radiator in the cooling circuit of the engine in response to a target instruction, wherein the target instruction is used to indicate that the actual intake temperature of the intake manifold is maintained at the target intake temperature; a determination module for determining a first duty cycle of the electric pump in the cooling circuit based on the actual intake temperature, the current temperature and a first corresponding relationship, wherein the first corresponding relationship is used to indicate the correspondence between the sample intake temperature of the intake manifold and the sample temperature of the low-temperature radiator when the target intake temperature is used as the target, and the first sample duty cycle of the electric pump; and a control module for controlling the flow of coolant in the cooling circuit based on the first duty cycle.

[0021] In combination with the second aspect, in some possible implementations, the determination module is specifically used to: compare the actual intake temperature with multiple sample intake temperatures in the first correspondence, and determine at least one candidate intake temperature that matches the actual intake temperature from the multiple sample intake temperatures; compare the current temperature with at least one sample temperature corresponding to the at least one candidate intake temperature in the first correspondence, and determine a candidate temperature that matches the current temperature from the at least one sample temperature; and determine the first sample duty cycle of the electric pump corresponding to the candidate temperature as the first duty cycle.

[0022] With reference to the second aspect and the foregoing implementation manners, in some possible implementation manners, the acquisition module is specifically configured to acquire, in a case where the target vehicle is in a driving state, a driving speed of the target vehicle, a driving mode of the target vehicle, and an ambient temperature of an environment in which the target vehicle is located; the determination module is specifically further configured to determine, based on the driving speed, the ambient temperature, and a second correspondence relationship, a second duty cycle of the electric pump, the second correspondence relationship being used to indicate a correspondence relationship between a sample driving speed of a vehicle and a sample ambient temperature of an environment in which the vehicle is located and a second sample duty cycle of the electric pump when the target intake air temperature is targeted; correct the second duty cycle based on the driving mode to obtain a first corrected duty cycle; and the control module is specifically configured to control the flow of the coolant based on a sum of the first duty cycle and the first corrected duty cycle.

[0023] With reference to the second aspect and the foregoing implementation manners, in some possible implementation manners, the determination module is specifically further configured to determine, based on the driving mode, the second duty cycle, and a correction correspondence relationship, a correction factor, the correction factor being used to correct the second sample duty cycle, the correction correspondence relationship being used to indicate a correspondence relationship between a sample driving mode of a vehicle and a sample correction factor when the target intake air temperature is targeted and the second duty cycle is corrected; and determine the first corrected duty cycle based on a product of the second duty cycle and the correction factor.

[0024] With reference to the second aspect and the foregoing implementation manners, in some possible implementation manners, the acquisition module is specifically further configured to acquire a positional relationship between an air conditioning condenser and the low-temperature radiator in the target vehicle, and a current opening degree of an active intake grille in the cooling loop; the determination module is specifically further configured to determine a second corrected duty cycle based on the positional relationship and the current opening degree; and the control module is specifically further configured to control the flow of the coolant based on a sum of the first duty cycle, a first corrected duty cycle, and the second corrected duty cycle, the first corrected duty cycle being determined based on a driving speed of the target vehicle, a driving mode of the target vehicle, and an ambient temperature of an environment in which the target vehicle is located.

[0025] With reference to the second aspect and the foregoing implementation manners, in some possible implementation manners, the determination module is specifically further configured to determine, based on the current opening degree and a reference correspondence relationship, a reference duty cycle, the reference correspondence relationship being used to indicate a correspondence relationship between a sample opening degree of the active intake grille and a reference sample duty cycle of the electric pump when the target intake air temperature is targeted; in a case where the positional relationship indicates that the air conditioning condenser is arranged behind the low-temperature radiator, determine a preset duty cycle as a third duty cycle; in a case where the positional relationship indicates that the air conditioning condenser is arranged in front of the low-temperature radiator, determine the third duty cycle based on an operating state of an air conditioning compressor in the target vehicle; and determine, as the second corrected duty cycle, a sum of the reference duty cycle and the third duty cycle.

[0026] With reference to the second aspect and the foregoing implementations, in a possible implementation, the determining module is specifically further configured to determine the preset duty cycle as the third duty cycle when the working state is the closed state; the obtaining module is specifically further configured to obtain an air conditioning pressure in an air conditioning system in the target vehicle when the working state is the open state; and the determining module is specifically further configured to determine the third duty cycle based on the air conditioning pressure and a third corresponding relationship, the third corresponding relationship being used to indicate a corresponding relationship between a sample air conditioning pressure and a third sample duty cycle of the electric pump when the target intake air temperature is targeted.

[0027] In a third aspect, a computer-readable storage medium is provided, which stores computer program codes. When the computer program codes are run on a computer, the computer is caused to perform the method in the first aspect or any possible implementation of the first aspect.

[0028] In a fourth aspect, a vehicle is provided, which includes a memory and a processor. The memory is configured to store executable program codes, and the processor is configured to invoke and run the executable program codes from the memory, so that the vehicle performs the method in the first aspect or any possible implementation of the first aspect. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a schematic diagram of a scene using a vehicle provided by an embodiment of the present application;

[0030] Figure 2 is a structural schematic diagram of a method for controlling a coolant flow provided by an embodiment of the present application;

[0031] Figure 3 is a schematic diagram of a cooling circuit of an engine provided by an embodiment of the present application;

[0032] Figure 4 is a structural schematic diagram of an apparatus for controlling a coolant flow provided by an embodiment of the present application;

[0033] Figure 5 is a structural schematic diagram of a vehicle provided by an embodiment of the present application. DETAILED DESCRIPTION

[0034] The following will clearly and thoroughly describe the technical solutions in this application in conjunction with the accompanying drawings. In the description of the embodiments of this application, unless otherwise specified, " / " means or, for example, A / B can mean A or B: "and / or" in the text is only a description of the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of this application, "multiple" means two or more than two.

[0035] In the following, the terms "first" and "second" are used for descriptive purposes only and should not be understood to imply or suggest relative importance or implicitly indicate the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0036] Figure 1 This is a schematic diagram of a vehicle usage scenario provided in an embodiment of the present application.

[0037] For example, Figure 1 Vehicle A is shown as a hybrid vehicle. For the engine's intake manifold in this vehicle, a suitable intake air temperature is beneficial for improving engine performance and ensuring the proper functioning of its internal components. Therefore, it is necessary to control the actual intake air temperature of the engine's intake manifold to maintain it at a target intake air temperature.

[0038] In the process of controlling the actual intake air temperature of the engine's intake manifold, the relevant technology uses a proportional integral derivative (PID) control system to control the intake air temperature of the intake manifold. This control method can control the intake air temperature of the engine's intake manifold to a certain extent. However, the PID control system is extremely complex and requires frequent control of the actual intake air temperature based on the target intake air temperature. This often requires a long control time, which increases the energy consumption of Vehicle A.

[0039] In order to solve the above problems, this application proposes a method for controlling the coolant flow rate. This method controls the coolant flow rate in the engine's cooling circuit by adjusting the duty cycle of the electric pump, thereby controlling the actual intake air temperature of the intake manifold, thereby simplifying the control process and shortening the control time. The specific implementation process of the method can be referred to as follows Figure 2 .

[0040] Figure 2 This is a schematic flow chart of a method for controlling coolant flow provided in an embodiment of the present application.

[0041] It should be understood that the method for controlling the flow of coolant provided in the embodiment of the present application can be applied toFigure 1 The vehicle (e.g. Figure 1 A in FIG. 1, also referred to as a target vehicle hereinafter) is shown. Specifically, the method of controlling the coolant flow can be applied to a vehicle controller in the vehicle.

[0042] As an example, as Figure 2 shown in FIG. 2, the method 200 includes:

[0043] At step 201, the vehicle obtains an actual intake temperature of an intake manifold of an engine in the target vehicle and a current temperature of a low-temperature radiator in a cooling circuit of the engine in response to a target instruction for instructing to maintain the actual intake temperature of the intake manifold at a target intake temperature.

[0044] It should be understood that the "intake manifold of the engine" in the above step 201 refers to an intake pipe in front of the engine for introducing air into the engine. The "low-temperature radiator in the cooling circuit" in the above step 201 is used to dissipate heat of the coolant after the coolant in the cooling circuit flows from the engine to the low-temperature radiator.

[0045] It should also be understood that in the above step 201, when the target vehicle has the actual intake temperature of the intake manifold of the engine and the current temperature of the low-temperature radiator in the cooling circuit of the engine, the target vehicle can be in a driving state (the target vehicle itself has displacement changes) or can not be in the driving state.

[0046] In some embodiments, the target vehicle is a hybrid electric vehicle or a fuel vehicle.

[0047] In some embodiments, at step 201, the vehicle obtains the actual intake temperature of the intake manifold by an intake temperature sensor disposed on the intake manifold, and obtains the current temperature by a target sensor disposed in front of the low-temperature radiator.

[0048] At step 202, the vehicle determines a first duty cycle of the electric pump in the cooling circuit based on the actual intake temperature, the current temperature and a first corresponding relationship, the first corresponding relationship being used to indicate a corresponding relationship between a sample intake temperature of the intake manifold and a sample temperature of the low-temperature radiator and a first sample duty cycle of the electric pump when the target intake temperature is targeted.

[0049] It should be understood that during a test, when the actual intake air temperature of the intake manifold is intake air temperature 1 and the temperature of the low-temperature radiator is temperature 2, the actual intake air temperature of the intake manifold is maintained at the target intake air temperature after the electric pump controls the coolant flow in the cooling circuit at duty cycle 3. Therefore, intake air temperature 1 and temperature 2 can be associated with duty cycle 3. In this first association, one sample intake air temperature of the intake manifold and one sample temperature of the low-temperature radiator correspond to one first sample duty cycle of the electric pump.

[0050] It should also be understood that the "duty cycle" in step 202 above refers to the ratio of the electric pump's operating time within a working cycle to the cycle duration (the duration of a working cycle). In other words, the electric pump's duty cycle is the ratio of the time the electric pump is on to the time it is off. The duty cycle is defined as: Duty cycle = (operating time of the electric pump within a working cycle / duration of a working cycle) × 100%. The duty cycle can be expressed as a percentage (%).

[0051] In one possible implementation, the vehicle in step 202 determines the first duty cycle of the electric pump in the cooling circuit based on the actual intake temperature, the current temperature and the first corresponding relationship, including: the vehicle compares the actual intake temperature with multiple sample intake temperatures in the first corresponding relationship, and determines at least one candidate intake temperature that matches the actual intake temperature from the multiple sample intake temperatures; the vehicle compares the current temperature with at least one sample temperature corresponding to the at least one candidate intake temperature in the first corresponding relationship, and determines a candidate temperature that matches the current temperature from the at least one sample temperature; the vehicle determines the first sample duty cycle of the electric pump corresponding to the candidate temperature as the first duty cycle.

[0052] It should be understood that the "first correspondence" in the above solution includes multiple sample intake air temperatures and corresponding low-temperature radiator sample temperatures. The multiple sample intake air temperatures may contain the same sample intake air temperature, and the multiple sample temperatures may contain the same sample temperature. Therefore, at least one candidate intake air temperature matching the actual intake air temperature can be first determined from the multiple sample intake air temperatures. Then, a candidate temperature (one temperature) matching the current temperature can be determined from the at least one sample temperature corresponding to the at least one candidate intake air temperature to obtain the first duty cycle.

[0053] It should also be understood that in the above embodiment, "at least one candidate intake air temperature that matches the actual intake air temperature" means that the temperature difference between the actual intake air temperature and the at least one candidate intake air temperature is less than a preset temperature. "A candidate temperature that matches the current temperature" means that the temperature difference between the current temperature and the candidate temperature is less than the preset temperature. In some embodiments, the preset temperature is 1°.

[0054] In the technical solution, the first corresponding relationship is used to indicate the corresponding relationship between the sample intake manifold temperature of the intake manifold, the sample temperature of the low-temperature radiator and the first sample duty cycle of the electric pump when the target intake temperature is taken as the target. There can be multiple same sample intake manifold temperatures and multiple same sample temperatures in the first corresponding relationship. In this case, the method determines at least one candidate intake temperature matching the actual intake temperature from the multiple sample intake manifold temperatures, and then determines a candidate temperature matching the current temperature from at least one sample temperature corresponding to the at least one candidate intake temperature, thereby obtaining the first duty cycle. The method can determine the accurate first duty cycle through the matching manner.

[0055] For example, when the target intake temperature is 40°, the first corresponding relationship shown in Table 1 is given.

[0056] Table 1

[0057]

[0058]

[0059] As shown in Table 1, the first sample duty cycle can be represented by a percentage. For example, when the sample intake manifold temperature of the intake manifold is 50° and the sample temperature of the low-temperature radiator is -10°, the first sample duty cycle is 70%. When the actual intake temperature of the intake manifold of the engine is 30° and the current temperature of the low-temperature radiator is 10°, the first duty cycle of the electric pump can be determined by Table 1 as 30%.

[0060] Figure 3 FIG. 1 is a schematic diagram of a cooling circuit of an engine provided by an embodiment of the present application.

[0061] For example, as shown in FIG. 1, the cooling circuit of the engine includes an intake manifold 1, a low-temperature radiator 2, an electric pump 3 and a control unit 4. Figure 3As shown, air enters the engine through the intake manifold of the engine, and inside the engine, fuel is mixed with the air and combusted to produce energy and heat. The actual intake temperature of the intake manifold affects the mass of air that enters the cylinder. Generally, the target intake temperature of the intake manifold is required for the vehicle to adjust the amount of fuel injection to ensure a proper air-fuel ratio, thereby improving combustion efficiency and reducing exhaust emissions. When the actual intake temperature of the intake manifold is greater than the target intake temperature, the electric pump draws coolant from the low-temperature radiator and delivers the coolant to the intercooler. The intercooler cools (lowers the temperature of) the incoming air, and the cooled air is then delivered to the cylinder head and cylinder block of the engine. If the actual temperature of the cooled air is maintained at the target intake temperature at this time, the vehicle controls the thermostat to be in a closed state. If the actual temperature of the cooled air is still greater than the target intake temperature at this time, the vehicle controls the thermostat to be in an open state, and the electric pump continues to draw coolant from the low-temperature radiator and deliver the coolant to the intercooler. The intercooler cools (lowers the temperature of) the incoming air until the actual intake temperature of the intake manifold is maintained at the target intake temperature, and the vehicle controls the thermostat to be in a closed state.

[0062] In step 203, the vehicle controls the flow rate of the coolant in the cooling circuit based on the first duty cycle.

[0063] It should be understood that "controlling the flow rate of the coolant in the cooling circuit based on the first duty cycle" in the above step 203 means that the flow rate of the coolant is controlled by adjusting the first duty cycle of the electric pump to change the working time of the electric pump in a working cycle. The higher the first duty cycle, the longer the working time of the electric pump in a working cycle, and the greater the flow rate of the coolant. The lower the first duty cycle, the shorter the working time of the electric pump in a working cycle, and the smaller the flow rate of the coolant.

[0064] The technical solutions in the present application provide various methods for determining the duty cycle of the electric pump to control the flow rate of the coolant in the cooling circuit based on various duty cycles. Specifically, the first determination method: corresponding to step 202, only the actual intake temperature of the intake manifold of the engine in the target vehicle and the current temperature of the low-temperature radiator in the cooling circuit of the engine are considered. The following describes several other determination methods.

[0065] Second: considering the actual intake temperature of the intake manifold of the engine in the target vehicle and the current temperature of the low-temperature radiator in the cooling circuit of the engine, the driving speed, the driving mode of the target vehicle when the target vehicle is in a driving state, the ambient temperature of the environment in which the target vehicle is located, and the positional relationship between the air conditioner condenser and the low-temperature radiator in the target vehicle, and the current opening degree of the active intake grille in the cooling circuit

[0066] In a possible implementation, in step 203, when the target vehicle is in a driving state, the vehicle obtains a driving speed of the target vehicle, a driving mode, and an ambient temperature of an environment in which the target vehicle is located; the vehicle determines a second duty cycle of the electric pump based on the driving speed, the ambient temperature, and a second correspondence relationship, the second correspondence relationship being used to indicate a correspondence relationship between a sample driving speed of the vehicle and a sample ambient temperature of an environment in which the vehicle is located, and a second sample duty cycle of the electric pump, when the target intake air temperature is targeted; the vehicle corrects the second duty cycle based on the driving mode to obtain a first corrected duty cycle; and the vehicle controls the flow of the coolant based on a sum of the first duty cycle and the first corrected duty cycle.

[0067] It should be understood that the "driving mode" in the above solution is used to indicate different driving conditions. Different driving modes correspond to different performance parameters of the target vehicle, including but not limited to engine response, gear shifting logic of the transmission, steering assist, suspension stiffness, four-wheel drive system distribution, and the like. The driving mode includes an economy mode, a standard mode, a sports mode, a snow mode, a mud mode, a sand mode, and the like. In addition, the driving speed of the target vehicle is in km / h.

[0068] It should also be understood that, in a test process, when the driving speed of the target vehicle is driving speed 1 and the ambient temperature of the environment in which the target vehicle is located is ambient temperature 2, the electric pump controls the flow of the coolant in the cooling circuit at duty cycle 4, and the actual intake air temperature of the intake manifold is maintained at the target intake air temperature. Therefore, driving speed 1 and ambient temperature 2 can be corresponded to duty cycle 4. A sample driving speed of the vehicle and a sample ambient temperature of the environment in which the vehicle is located in the second correspondence relationship correspond to a second sample duty cycle of the electric pump.

[0069] It should also be understood that the sum of the first duty cycle and the first corrected duty cycle in the above solution is a duty cycle. Therefore, the process of "the vehicle controls the flow of the coolant based on the sum of the first duty cycle and the first corrected duty cycle" in the above solution is similar to "the vehicle controls the flow of the coolant based on the first duty cycle" in step 203, and will not be described here.

[0070] In the technical solution, the vehicle considers the influence of the driving speed and the ambient temperature on the second duty cycle of the electric pump when the target vehicle is in the driving state. This is because the driving speed and the ambient temperature of the target vehicle have an influence on the intake temperature during the control of the intake temperature of the intake manifold. When driving at high speed, the air flow rate in the intake manifold increases, the friction between air molecules increases, and the intake temperature rises. When driving at low speed, the intake temperature is relatively low. In a high-temperature environment, the air temperature in the intake manifold is relatively high. In a low-temperature environment, the air temperature in the intake manifold is relatively low. In addition, the vehicle in the method also considers the influence of the driving mode of the target vehicle, corrects the second duty cycle through the driving mode to obtain a first corrected duty cycle, and then controls the flow of the coolant based on the sum of the first duty cycle and the first corrected duty cycle. This is because different driving modes will result in different working states of the engine, thereby affecting the intake temperature. For example, in the economy mode, the load of the engine is relatively small, and the intake amount and the intake speed of the engine will also decrease accordingly. Because the flow speed of the air in the intake manifold decreases, the heat exchange time with the wall surface of the intake manifold increases, and the intake temperature increases. In the sports mode, the load of the engine is large, and the intake amount and the intake speed of the engine increase. The fast-flowing air stays in the intake manifold for a short time, and the heat exchange with the wall surface decreases, and the intake temperature is relatively low. Therefore, the first corrected duty cycle determined by the vehicle in the method through the above three influencing factors (driving speed, ambient temperature, and driving mode) is accurate, and the flow of the coolant can be more accurately controlled through the sum of the first duty cycle and the first corrected duty cycle, so that the actual intake temperature of the intake manifold is maintained at the target intake temperature.

[0071] In some embodiments, the vehicle determines the second duty cycle of the electric pump based on the driving speed, the ambient temperature, and a second corresponding relationship, including: the vehicle compares the driving speed with a plurality of sample driving speeds in the second corresponding relationship, determines at least one candidate driving speed matched with the driving speed from the plurality of sample driving speeds; the vehicle compares the ambient temperature with at least one sample ambient temperature corresponding to the at least one candidate driving speed in the second corresponding relationship, determines a candidate ambient temperature matched with the ambient temperature from the at least one sample ambient temperature; and the vehicle determines a second sample duty cycle of the electric pump corresponding to the candidate ambient temperature as the second duty cycle.

[0072] It should be understood that the "second correspondence" in the above solution includes multiple sample driving speeds and corresponding sample ambient temperatures. The multiple sample driving speeds may contain the same sample driving speed, and the multiple sample ambient temperatures may contain the same sample ambient temperature. Therefore, the second duty cycle can be obtained by first determining at least one candidate driving speed that matches the driving speed from the multiple sample driving speeds, and then determining a candidate ambient temperature (one ambient temperature) that matches the ambient temperature from the at least one sample ambient temperature corresponding to the at least one candidate driving speed.

[0073] It should also be understood that, in the above solution, "at least one candidate driving speed that matches the driving speed" means that the speed difference between the driving speed and the at least one candidate driving speed is less than a preset speed. "A candidate ambient temperature that matches the ambient temperature" means that the temperature difference between the ambient temperature and the candidate ambient temperature is less than the preset temperature.

[0074] For example, taking the target intake air temperature as 40° as an example, the second corresponding relationship shown in Table 2 is given.

[0075] Table 2

[0076]

[0077] As shown in Table 2 above, the second sample duty cycle can be expressed as a percentage. For example, when the sample ambient temperature is -10°C and the sample driving speed is 90 km / h, the second sample duty cycle is 3%. When the target vehicle is driving at 90 km / h and the ambient temperature is 10°C, the second duty cycle of the electric pump can be determined to be 5% based on Table 2. Some of the second sample duty cycles in Table 2 are negative values, indicating a reduction in the original duty cycle.

[0078] In one possible implementation, the vehicle corrects the second duty cycle based on the driving mode to obtain a first corrected duty cycle, including: the vehicle determines a correction factor based on the driving mode, the second duty cycle and the correction correspondence, the correction factor being used to correct the second duty cycle, the correction correspondence being used to indicate the correspondence between the vehicle's sample driving mode and the sample correction factor when the target intake temperature is used as the target and the second sample duty cycle is corrected; the vehicle determines the first corrected duty cycle based on the product of the second duty cycle and the correction factor.

[0079] It should be understood that the "correction correspondence" in the above scheme is determined when the target intake air temperature is used as the target and the second sample duty cycle is corrected. During a test, when the target vehicle's driving speed was driving speed 1 and the ambient temperature of the target vehicle's environment was ambient temperature 2, after the electric pump controlled the flow of coolant in the cooling circuit with a duty cycle of 4, there was still a small temperature deviation between the actual intake air temperature of the intake manifold and the target intake air temperature. When the target vehicle's driving mode is driving mode 1, the corresponding correction factor is correction factor 1. Duty cycle 5 is obtained by correcting duty cycle 4 using correction factor 1. After the electric pump controls the flow of coolant in the cooling circuit with a duty cycle of 5, the actual intake air temperature of the intake manifold is maintained at the target intake air temperature. Therefore, driving mode 1 can be associated with correction factor 1. In this correction correspondence, one sample driving mode of the vehicle corresponds to one sample correction factor.

[0080] In the above technical solution, when the target vehicle is in motion, the vehicle in this method can obtain a corresponding correction factor from the correction correspondence based on the driving mode, and directly correct the second duty cycle based on this correction factor to obtain a first corrected duty cycle. The correction factor is determined based on the correction correspondence through a matching method, and therefore, the correction factor is relatively accurate, and the first corrected duty cycle is relatively accurate. The vehicle in this method can also quickly determine the correction factor and the first corrected duty cycle.

[0081] In some embodiments, the vehicle determines a correction factor based on the driving mode, the second duty cycle and the correction correspondence, including: the vehicle compares the second duty cycle with multiple second sample duty cycles in the correction correspondence, and determines a candidate second duty cycle that is the same as the second duty cycle from the multiple second sample duty cycles; the vehicle compares the driving mode with multiple sample driving modes corresponding to the candidate second duty cycle in the correction correspondence, and determines a candidate driving mode that is the same as the driving mode from the multiple sample driving modes; the vehicle determines the sample correction factor corresponding to the candidate driving mode in the correction correspondence as the correction factor.

[0082] For example, taking the target intake air temperature as 40° and the second duty cycle as 5% as an example, the correspondence between the sample driving modes and the sample correction factors in the correction correspondence shown in Table 3 is given.

[0083] Table 3

[0084]

[0085]

[0086] As shown in Table 3 above, exemplary, when the sample driving mode is economy mode, the sample correction factor is 0.95. When the driving mode of the target vehicle is snow mode, the correction factor for correcting the second duty cycle can be determined by Table 3 above as 1.1, and the vehicle determines the first corrected duty cycle as 5.5% (5%*1.1).

[0087] In one possible implementation, the vehicle controls the flow rate of the coolant in the cooling circuit based on the first duty cycle, including: the vehicle acquires a positional relationship between an air conditioning condenser and the low temperature radiator in the target vehicle, and a current opening degree of an active air intake grille in the cooling circuit; the vehicle determines a second corrected duty cycle based on the positional relationship and the current opening degree; and the vehicle controls the flow rate of the coolant based on a sum of the first duty cycle, a first corrected duty cycle and the second corrected duty cycle, the first corrected duty cycle being determined based on a driving speed of the target vehicle, a driving mode of the target vehicle and an ambient temperature of an environment in which the target vehicle is located.

[0088] It should be understood that the "air conditioning condenser" in the above solution is a cooling device of an air conditioning system in the target vehicle. The condenser can also be used to cool air entering an intake manifold of an engine. When the air conditioning system is running, the air conditioning condenser cools refrigerant from a gaseous state to a liquid state, releasing heat to the outside air. In this process, the temperature of the air around the air conditioning condenser will decrease. By designing the intake manifold of the engine to be close to the air conditioning condenser, the low-temperature air around the air conditioning condenser can be used to cool the air entering the intake manifold, thereby maintaining the intake temperature of the intake manifold.

[0089] It should also be understood that the "active air intake grille" in the above solution is located at the front end of the engine compartment of the engine, serving as an inlet for air flowing into the engine compartment. The amount of air entering the engine compartment can be adjusted by adjusting the opening degree of the active air intake grille. In addition, the active air intake grille and the intake manifold are relatively independent in position in the engine, but they are both related to the intake system of the engine. The intake manifold is part of the intake system and is responsible for distributing air to each cylinder. The active air intake grille controls the total amount of air entering the engine compartment, including the amount of air entering the intake manifold.

[0090] In the technical solution, the vehicle considers the positional relationship between the air conditioner condenser and the low-temperature radiator, and the influence of the current opening degree of the active intake grille on the second modified duty ratio of the electric pump in the cooling loop. This is because, in the process of controlling the intake temperature of the intake manifold, the positional relationship between the air conditioner condenser and the low-temperature radiator and the current opening degree of the active intake grille will affect the intake temperature. The air conditioner condenser is used to dissipate heat from the refrigerant in the air conditioning system, and the low-temperature radiator is mainly used to cool the engine coolant. If the positional relationship between the two is unreasonable, it may cause mutual interference of heat. For example, if the air conditioner condenser is located on the downwind side of the low-temperature radiator and is too close, a part of the heat dissipated by the air conditioner condenser may be reabsorbed by the low-temperature radiator, which will affect the efficiency of the cooling system of the engine. In the process of controlling the intake temperature of the intake manifold, when such heat affects the efficiency of the cooling system, it will indirectly affect the intake temperature of the intake manifold. The opening degree of the active intake grille affects the amount of air entering the cooling system. When the opening degree of the active intake grille is large, more cold air can enter the cooling system, which helps to reduce the temperature of the coolant. At this time, the duty ratio of the electric pump may not need to be too high; while the opening degree of the active intake grille is small, a higher duty ratio of the electric pump is needed. Therefore, the vehicle in the method can determine an accurate second modified duty ratio. In addition, the vehicle in the method can most accurately control the flow of the coolant by the sum of the first duty ratio, the first modified duty ratio and the second modified duty ratio, so as to maintain the actual intake temperature of the intake manifold at the target intake temperature.

[0091] In a possible implementation, the vehicle determines the second modified duty ratio based on the positional relationship and the current opening degree, including: the vehicle determines a reference duty ratio based on the current opening degree and a reference correspondence relationship, the reference correspondence relationship being used to indicate a correspondence relationship between a sample opening degree of the active intake grille and a reference sample duty ratio of the electric pump when the target intake temperature is targeted; in a case where the positional relationship indicates that the air conditioner condenser is arranged behind the low-temperature radiator, the vehicle determines a preset duty ratio as a third duty ratio; in a case where the positional relationship indicates that the air conditioner condenser is arranged in front of the low-temperature radiator, the vehicle determines the third duty ratio based on a working state of an air conditioner compressor in the target vehicle; and the vehicle determines the second modified duty ratio as a sum of the reference duty ratio and the third duty ratio.

[0092] It should be understood that the "reference correspondence relationship" in the above scheme is determined when the target intake temperature is targeted. In a test process, when the opening degree of the active intake grille is opening degree 3, the actual intake temperature of the intake manifold is maintained at the target intake temperature after the electric pump controls the flow of the coolant in the cooling loop at a duty ratio of 6. Therefore, opening degree 3 and duty ratio 6 can be corresponded. One sample opening degree of the active intake grille corresponds to one reference sample duty ratio of the electric pump in the reference correspondence relationship.

[0093] It should also be understood that the "preset duty cycle" in the above scheme is 0%.

[0094] It should also be understood that the "air conditioner compressor" in the above scheme plays a role in adjusting the refrigeration capacity in the process of controlling the intake air temperature of the intake manifold. When it is necessary to lower the intake air temperature, the air conditioner compressor works to compress the gaseous refrigerant into high-temperature and high-pressure gas, which is converted into liquid refrigerant after passing through the air conditioner condenser and other components. The liquid refrigerant is evaporated in the evaporator, thereby absorbing heat and lowering the temperature of the air flowing near the evaporator, which can be used to lower the intake air temperature of the intake manifold. Therefore, the working state of the air conditioner compressor affects the intake air temperature of the intake manifold.

[0095] In the above technical scheme, the vehicle in the method can directly obtain the corresponding correction factor from the reference corresponding relationship according to the current opening degree of the active air intake grille, to obtain the reference duty cycle. This makes it possible to quickly obtain an accurate reference duty cycle. Furthermore, when the air conditioner condenser is arranged behind the low-temperature radiator, the air conditioner condenser does not affect the heat dissipation capacity of the low-temperature radiator, that is, the positional relationship has little effect on the intake air temperature. Therefore, when the air conditioner condenser is arranged behind the low-temperature radiator, the vehicle in the method determines the preset duty cycle as the third duty cycle. When the air conditioner condenser is arranged in front of the low-temperature radiator, the air conditioner condenser will affect the heat dissipation capacity of the low-temperature radiator, and the degree of influence is related to the working state of the air conditioner compressor. Therefore, when the air conditioner condenser is arranged in front of the low-temperature radiator, the vehicle determines the third duty cycle based on the working state of the air conditioner compressor. In addition, the vehicle determines the second corrected duty cycle based on the sum of the reference duty cycle and the third duty cycle, which can take into account the influence of the thermal management architecture (components that affect the intake air amount, such as the air conditioner condenser, the active air intake grille, etc.) in the target vehicle on the intake air temperature of the intake manifold, and more accurately control the intake air temperature.

[0096] In some embodiments, the vehicle determines the reference duty cycle based on the current opening degree and the reference corresponding relationship, including: the vehicle compares the current opening degree with a plurality of sample opening degrees in the reference corresponding relationship, and determines a candidate opening degree matching the current opening degree from the plurality of sample opening degrees; and the vehicle determines a reference sample duty cycle corresponding to the candidate opening degree in the reference corresponding relationship as the reference duty cycle.

[0097] For example, when the target intake air temperature is 40°, the reference corresponding relationship shown in Table 4 is given.

[0098] Table 4

[0099]

[0100] As in Table 4 above, the sample opening degree can be expressed by percentage. For example, when the sample opening degree of the active intake grille is 40, the reference sample duty cycle is 40%. When the current opening degree of the active intake grille in the cooling circuit of the engine in the target vehicle is 20%, the reference duty cycle of the electric pump can be determined by Table 4 above to be 20%.

[0101] In a possible implementation, the vehicle determines the third duty cycle based on an operating state of an air conditioning compressor in the target vehicle, including: in a case where the operating state is a closed state, the vehicle determines the preset duty cycle as the third duty cycle; in a case where the operating state is an open state, the vehicle acquires an air conditioning pressure in an air conditioning system in the target vehicle; and the vehicle determines the third duty cycle based on the air conditioning pressure and a third corresponding relationship, the third corresponding relationship being used to indicate a corresponding relationship between a sample air conditioning pressure and a third sample duty cycle of the electric pump when the target intake air temperature is targeted.

[0102] It should be understood that the "air conditioning pressure" in the above solution refers to the pressure corresponding to the refrigerant in the air conditioning system at different positions when the refrigerant circulates in the air conditioning pipeline. The unit of the air conditioning pressure P is MPa.

[0103] It should also be understood that the "third corresponding relationship" in the above solution is determined when the target intake air temperature is targeted. In a test process, when the air conditioning pressure is pressure 4, the electric pump controls the flow of the cooling liquid in the cooling circuit at a duty cycle of 7, and the actual intake air temperature of the intake manifold is maintained at the target intake air temperature. Therefore, pressure 4 and duty cycle 7 can be corresponded. One sample air conditioning pressure in the third corresponding relationship corresponds to one third sample duty cycle of the electric pump.

[0104] It should also be understood that the specific process of "the vehicle determines the third duty cycle based on the air conditioning pressure and the third corresponding relationship" in the above solution is the same as that of "the vehicle determines the reference duty cycle based on the current opening degree and the reference corresponding relationship", which will not be repeated here.

[0105] In the above technical solution, when the working state of the air conditioner compressor is the closed state, the air conditioner condenser and the air conditioner compressor do not affect the heat dissipation capacity of the low-temperature radiator, that is, the position relationship has little effect on the intake air temperature. Therefore, in this method, the vehicle determines the preset duty cycle as the third duty cycle. When the working state of the air conditioner compressor is the open state, the air conditioner condenser will affect the heat dissipation capacity of the low-temperature radiator, and the degree of influence is related to the specific working state of the air conditioner compressor. When the air conditioner compressor is working (at different air conditioner pressures), the air conditioner condenser dissipates heat to affect the ambient air temperature. When the air conditioner condenser is arranged behind the low-temperature radiator, the cooling air first passes through the low-temperature radiator and then passes through the air conditioner condenser, and the heat dissipated by the air conditioner condenser will change the temperature of the cooling air. The air around the intake manifold of the engine exchanges heat with the cooling air, so the working state of the air conditioner compressor will affect the intake air temperature of the intake manifold. Therefore, the vehicle in this method considers the influence of the working state of the air conditioner compressor on the intake air temperature when the working state is closed and open, and the influence of the specific opening pressure on the intake air temperature when the working state is open, which can increase the accuracy of determining the third duty cycle.

[0106] It should be understood that the above second determination method corresponds to the technical solution of claim 5.

[0107] For example, when the target intake air temperature is 40°, the third corresponding relationship shown in Table 5 is given.

[0108] Table 5

[0109]

[0110] As shown in Table 5 above, for example, when the sample air conditioner pressure is 1.8 MPa, the third sample duty cycle is 25%. When the air conditioner pressure of the air conditioning system in the target vehicle is 1.2 MPa, the third duty cycle of the electric pump can be determined by Table 5 above to be 20%.

[0111] Third: only considering the driving speed, driving mode and ambient temperature of the target vehicle when the target vehicle is in a driving state

[0112] In some embodiments, when the target vehicle is in a driving state, the vehicle obtains a driving speed of the target vehicle, a driving mode, and an ambient temperature of an environment in which the target vehicle is located; the vehicle determines a second duty cycle of the electric pump based on the driving speed, the ambient temperature, and a second correspondence relationship, the second correspondence relationship being used to indicate a correspondence relationship between a sample driving speed of the vehicle and a sample ambient temperature of an environment in which the vehicle is located, and a second sample duty cycle of the electric pump when the target intake air temperature is targeted; the vehicle corrects the second duty cycle based on the driving mode to obtain a first corrected duty cycle; and the vehicle controls a flow rate of the coolant in the cooling circuit based on the first corrected duty cycle.

[0113] It should be understood that the implementation process of "the vehicle determines the second duty cycle of the electric pump based on the driving speed, the ambient temperature, and the second correspondence relationship" in the above scheme is the same as that of "the vehicle determines the second duty cycle of the electric pump based on the driving speed, the ambient temperature, and the second correspondence relationship" in the second determination method, and will not be repeated here.

[0114] It should also be understood that the implementation process of "the vehicle corrects the second duty cycle based on the driving mode to obtain the first corrected duty cycle" in the above scheme is the same as that of "the vehicle corrects the second duty cycle based on the driving mode to obtain the first corrected duty cycle" in the second determination method, and will not be repeated here.

[0115] It should also be understood that the process of "the vehicle controls the flow rate of the coolant in the cooling circuit based on the first corrected duty cycle" in the above scheme is similar to that of "the vehicle controls the flow rate of the coolant based on the first duty cycle" in step 203, and will not be repeated here.

[0116] Fourthly, only the positional relationship between the air conditioner condenser and the low-temperature radiator in the target vehicle and the current opening degree of the active intake grille in the cooling circuit are considered

[0117] In some embodiments, the vehicle obtains a positional relationship between an air conditioner condenser and a low-temperature radiator in the target vehicle and a current opening degree of an active intake grille in the cooling circuit; the vehicle determines a second corrected duty cycle based on the positional relationship and the current opening degree; and the vehicle controls a flow rate of the coolant in the cooling circuit based on the second corrected duty cycle.

[0118] It should be understood that the implementation process of "the vehicle determines the second corrected duty cycle based on the positional relationship and the current opening degree" in the above scheme is the same as that of "the vehicle determines the second corrected duty cycle based on the positional relationship and the current opening degree" in the second determination method, and will not be repeated here.

[0119] It should also be understood that the process of "the vehicle controlling the flow of the coolant in the cooling circuit based on the second corrected duty cycle" in the above scheme is similar to "the vehicle controlling the flow of the coolant based on the first duty cycle" in step 203, and will not be repeated here.

[0120] Fifthly, considering the actual intake temperature of the intake manifold of the engine in the target vehicle, the current temperature of the low-temperature radiator in the cooling circuit of the engine, and the driving speed, driving mode and ambient temperature of the environment where the target vehicle is located when the target vehicle is in the driving state

[0121] In some embodiments, when the target vehicle is in the driving state, the vehicle obtains the actual intake temperature of the intake manifold of the engine in the target vehicle, the current temperature of the low-temperature radiator in the cooling circuit of the engine, the driving speed, the driving mode and the ambient temperature of the environment where the target vehicle is located; the vehicle determines a first duty cycle of the electric pump in the cooling circuit based on the actual intake temperature, the current temperature and a first corresponding relationship, the first corresponding relationship being used to indicate a corresponding relationship between a sample intake temperature of the intake manifold and a sample temperature of the low-temperature radiator and a first sample duty cycle of the electric pump when the target intake temperature is targeted; the vehicle determines a second duty cycle of the electric pump based on the driving speed, the ambient temperature and a second corresponding relationship, the second corresponding relationship being used to indicate a corresponding relationship between a sample driving speed of the vehicle and a sample ambient temperature of the environment where the vehicle is located and a second sample duty cycle of the electric pump when the target intake temperature is targeted; the vehicle corrects the second duty cycle based on the driving mode to obtain a first corrected duty cycle; and the vehicle controls the flow of the coolant in the cooling circuit based on the sum of the first duty cycle and the first corrected duty cycle.

[0122] It should be understood that the implementation process of "the vehicle determining the first duty cycle of the electric pump in the cooling circuit based on the actual intake temperature, the current temperature and the first corresponding relationship" in the above scheme is the same as that of "the vehicle determining the first duty cycle of the electric pump in the cooling circuit based on the actual intake temperature, the current temperature and the first corresponding relationship" in the first determination method, and will not be repeated here.

[0123] It should also be understood that the implementation process of "the vehicle determining the second duty cycle of the electric pump based on the driving speed, the ambient temperature and the second corresponding relationship" in the above scheme is the same as that of "the vehicle determining the second duty cycle of the electric pump based on the driving speed, the ambient temperature and the second corresponding relationship" in the second determination method, and will not be repeated here.

[0124] It should also be understood that the implementation process of "the vehicle corrects the second duty cycle to obtain a first corrected duty cycle based on the driving mode" in the above scheme is the same as the implementation process of "the vehicle corrects the second duty cycle to obtain a first corrected duty cycle based on the driving mode" in the second determination method, and will not be repeated here.

[0125] It should also be understood that the sum of the first duty cycle and the first corrected duty cycle in the above scheme is the duty cycle. Therefore, the process of "the vehicle controls the flow of the coolant in the cooling circuit based on the sum of the first duty cycle and the first corrected duty cycle" in the above scheme is similar to "the vehicle controls the flow of the coolant based on the first duty cycle" in step 203, and will not be repeated here.

[0126] It should be understood that the above fifth determination method corresponds to the technical scheme of claim 3.

[0127] Sixth: considering the actual intake temperature of the intake manifold of the engine in the target vehicle, the current temperature of the low-temperature radiator in the cooling circuit of the engine, the positional relationship between the air conditioning condenser and the low-temperature radiator in the target vehicle, and the current opening degree of the active intake grille in the cooling circuit

[0128] In some embodiments, the vehicle obtains the actual intake temperature of the intake manifold of the engine in the target vehicle, the current temperature of the low-temperature radiator in the cooling circuit of the engine, the positional relationship between the air conditioning condenser and the low-temperature radiator in the target vehicle, and the current opening degree of the active intake grille in the cooling circuit; the vehicle determines a first duty cycle of the electric pump in the cooling circuit based on the actual intake temperature, the current temperature, and a first correspondence relationship, the first correspondence relationship being used to indicate a correspondence relationship between a sample intake temperature of the intake manifold and a sample temperature of the low-temperature radiator and a first sample duty cycle of the electric pump when the target intake temperature is targeted; the vehicle determines a second corrected duty cycle based on the positional relationship and the current opening degree; and the vehicle controls the flow of the coolant in the cooling circuit based on the sum of the first duty cycle and the second corrected duty cycle.

[0129] It should be understood that the implementation process of "the vehicle determines a first duty cycle of the electric pump in the cooling circuit based on the actual intake temperature, the current temperature, and a first correspondence relationship" in the above scheme is the same as the implementation process of "the vehicle determines a first duty cycle of the electric pump in the cooling circuit based on the actual intake temperature, the current temperature, and a first correspondence relationship" in the first determination method, and will not be repeated here.

[0130] It should also be understood that the implementation process of "the vehicle determines a second corrected duty cycle based on the positional relationship and the current opening degree" in the above scheme is the same as the implementation process of "the vehicle determines a second corrected duty cycle based on the positional relationship and the current opening degree" in the second determination method, and will not be repeated here.

[0131] It should also be understood that the sum of the first duty cycle and the second corrected duty cycle in the above scheme is the duty cycle. Therefore, the process of "the vehicle controlling the flow of the coolant in the cooling circuit based on the sum of the first duty cycle and the second corrected duty cycle" in the above scheme is similar to "the vehicle controlling the flow of the coolant based on the first duty cycle" in step 203, and will not be repeated here.

[0132] Seventh: considering the driving speed of the target vehicle, the driving mode of the target vehicle, the ambient temperature of the environment in which the target vehicle is located, and the positional relationship between the air conditioning condenser and the low-temperature radiator in the target vehicle, and the current opening degree of the active air intake grille in the cooling circuit when the target vehicle is in the driving state

[0133] In some embodiments, when the target vehicle is in the driving state, the vehicle obtains the driving speed of the target vehicle, the driving mode of the target vehicle, the ambient temperature of the environment in which the target vehicle is located, the positional relationship between the air conditioning condenser and the low-temperature radiator in the target vehicle, and the current opening degree of the active air intake grille in the cooling circuit; the vehicle determines a second duty cycle of the electric pump based on the driving speed, the ambient temperature, and a second corresponding relationship, the second corresponding relationship indicating a corresponding relationship between a sample driving speed of the vehicle and a sample ambient temperature of the environment in which the vehicle is located, and a second sample duty cycle of the electric pump when the target intake temperature is targeted; the vehicle corrects the second duty cycle based on the driving mode to obtain a first corrected duty cycle; the vehicle determines a second corrected duty cycle based on the positional relationship and the current opening degree; and the vehicle controls the flow of the coolant in the cooling circuit based on the sum of the first corrected duty cycle and the second corrected duty cycle.

[0134] It should be understood that the implementation process of "the vehicle determining the second duty cycle of the electric pump based on the driving speed, the ambient temperature, and the second corresponding relationship" in the above scheme is the same as that of "the vehicle determining the second duty cycle of the electric pump based on the driving speed, the ambient temperature, and the second corresponding relationship" in the second determination method, and will not be repeated here.

[0135] It should also be understood that the implementation process of "the vehicle correcting the second duty cycle based on the driving mode to obtain the first corrected duty cycle" in the above scheme is the same as that of "the vehicle correcting the second duty cycle based on the driving mode to obtain the first corrected duty cycle" in the second determination method, and will not be repeated here.

[0136] It should also be understood that the implementation process of "the vehicle determining the second corrected duty cycle based on the positional relationship and the current opening degree" in the above scheme is the same as that of "the vehicle determining the second corrected duty cycle based on the positional relationship and the current opening degree" in the second determination method, and will not be repeated here.

[0137] It should also be understood that the sum of the first modified duty cycle and the second modified duty cycle in the above solution is the duty cycle. Therefore, the process of "the vehicle controlling the flow of the coolant in the cooling circuit based on the sum of the first modified duty cycle and the second modified duty cycle" in the above solution is similar to "the vehicle controlling the flow of the coolant based on the first duty cycle" in step 203, and will not be described here.

[0138] Figure 4 is a structural schematic diagram of a device for controlling the flow of coolant provided by an embodiment of the present application.

[0139] For example, as shown in Figure 4 The device 400 includes:

[0140] The acquisition module 401 is configured to acquire an actual intake temperature of an intake manifold of an engine in a target vehicle and a current temperature of a low-temperature radiator in a cooling circuit of the engine in response to a target instruction, the target instruction being used to instruct to maintain the actual intake temperature of the intake manifold at a target intake temperature.

[0141] The determination module 402 is configured to determine a first duty cycle of an electric pump in the cooling circuit based on the actual intake temperature, the current temperature, and a first correspondence relationship, the first correspondence relationship being used to indicate a correspondence relationship between a sample intake temperature of an intake manifold and a sample temperature of a low-temperature radiator and a first sample duty cycle of an electric pump when the target intake temperature is targeted.

[0142] The control module 403 is configured to control the flow of the coolant in the cooling circuit based on the first duty cycle.

[0143] Optionally, the determination module 401 is specifically configured to: compare the actual intake temperature with a plurality of sample intake temperatures in the first correspondence relationship, determine at least one candidate intake temperature matching the actual intake temperature from the plurality of sample intake temperatures; compare the current temperature with at least one sample temperature corresponding to the at least one candidate intake temperature in the first correspondence relationship, determine a candidate temperature matching the current temperature from the at least one sample temperature; and determine a first sample duty cycle of the electric pump corresponding to the candidate temperature as the first duty cycle.

[0144] Optionally, the acquisition module 401 is specifically configured to acquire the driving speed, the driving mode and the ambient temperature of the environment in which the target vehicle is located, in the case that the target vehicle is in a driving state; the determination module 402 is specifically further configured to determine a second duty cycle of the electric pump based on the driving speed, the ambient temperature and a second corresponding relationship, the second corresponding relationship being used to indicate a corresponding relationship between a sample driving speed of a vehicle and a sample ambient temperature of an environment in which the vehicle is located and a second sample duty cycle of the electric pump, when the target intake air temperature is targeted; correct the second duty cycle based on the driving mode to obtain a first corrected duty cycle; and the control module 403 is specifically configured to control the flow of the coolant based on a sum of the first duty cycle and the first corrected duty cycle.

[0145] Optionally, the determination module 402 is specifically further configured to determine a correction factor based on the driving mode, the second duty cycle and a correction corresponding relationship, the correction factor being used to correct the second duty cycle, the correction corresponding relationship being used to indicate a corresponding relationship between a sample driving mode of a vehicle and a sample correction factor, when the target intake air temperature is targeted and a second sample duty cycle is corrected; determine the first corrected duty cycle based on a product between the second duty cycle and the correction factor.

[0146] Optionally, the acquisition module 401 is specifically further configured to acquire a positional relationship between an air conditioning condenser and the low-temperature radiator in the target vehicle, and a current opening degree of an active intake grille in the cooling circuit; the determination module 402 is specifically further configured to determine a second corrected duty cycle based on the positional relationship and the current opening degree; and the control module 403 is specifically further configured to control the flow of the coolant based on a sum of the first duty cycle, the first corrected duty cycle and the second corrected duty cycle, the first corrected duty cycle being determined based on the driving speed, the driving mode and the ambient temperature of the environment in which the target vehicle is located.

[0147] Optionally, the determination module 402 is specifically further configured to determine a reference duty cycle based on the current opening degree and a reference corresponding relationship, the reference corresponding relationship being used to indicate a corresponding relationship between a sample opening degree of an active intake grille and a reference sample duty cycle of the electric pump, when the target intake air temperature is targeted; determine a preset duty cycle as a third duty cycle in the case that the positional relationship indicates that the air conditioning condenser is arranged behind the low-temperature radiator; determine the third duty cycle based on a working state of an air conditioning compressor in the target vehicle, in the case that the positional relationship indicates that the air conditioning condenser is arranged in front of the low-temperature radiator; and determine the second corrected duty cycle as a sum of the reference duty cycle and the third duty cycle.

[0148] Optionally, the determining module 402 is further configured to determine the preset duty cycle as the third duty cycle when the working state is the closed state; the obtaining module 401 is further configured to obtain an air conditioning pressure in an air conditioning system in the target vehicle when the working state is the open state; and the determining module 402 is further configured to determine the third duty cycle based on the air conditioning pressure and a third corresponding relationship, the third corresponding relationship being used to indicate a corresponding relationship between a sample air conditioning pressure and a third sample duty cycle of the electric pump when the target intake air temperature is taken as a target.

[0149] The embodiment further provides a computer readable storage medium, which stores computer program codes, and the computer program codes make the computer execute the related method steps and realize the method for controlling the coolant flow rate provided in the above embodiment when the computer program codes are executed on the computer.

[0150] Figure 5 is a structural schematic diagram of a vehicle provided in the embodiment.

[0151] As shown in Figure 5 The vehicle 500 includes a memory 501 and a processor 502, wherein the memory 501 stores executable program codes 503, and the processor 502 is configured to invoke and execute the executable program codes 503 to execute the method for controlling the coolant flow rate.

[0152] In addition, the embodiment of the present application also protects a device, which can include a memory and a processor, wherein the memory stores executable program codes, and the processor is configured to invoke and execute the executable program codes to execute the method for controlling the coolant flow rate provided in the embodiment of the present application.

[0153] The embodiment can divide the device into functional modules according to the above method examples, for example, each functional module can be corresponding, or two or more functions can be integrated in one processing module, and the integrated module can be realized in the form of hardware. It should be noted that the division of the modules in the embodiment is illustrative, and is only a logical function division, and another division mode can be used in actual implementation.

[0154] When each functional module is divided according to each function, the device can further include an obtaining module, a determining module and a control module, etc. It should be noted that all related contents involved in the above method embodiments can be referred to the function description of the corresponding functional module, and will not be repeated here.

[0155] It should be understood that the device provided in the embodiment is used to execute the above method for controlling the coolant flow rate, and thus the same effect as the above method can be achieved.

[0156] In the case of employing the integrated unit, the device can include a processing module, a storage module. Wherein, when the device is applied to a vehicle, the processing module can be used to control and manage the actions of the vehicle. The storage module can be used to support the vehicle to execute relevant executable program codes, etc.

[0157] Wherein, the processing module can be a processor or a controller, which can realize or execute various exemplary logical blocks, modules and circuits shown in combination with the disclosure of the present application. The processor can also be a combination of computing functions, such as including one or more microprocessor combinations, digital signal processing (DSP) and microprocessor combinations, etc. The storage module can be a memory.

[0158] In addition, the device provided by the embodiments of the present application can be a chip, an assembly or a module, the chip can include a connected processor and a memory; wherein the memory is used to store instructions, when the processor calls and executes the instructions, the chip can execute the method for controlling the flow of cooling liquid provided by the above embodiments.

[0159] The embodiments also provide a computer program product, when the computer program product runs on a computer, so that the computer executes the above related steps to realize the method for controlling the flow of cooling liquid provided by the above embodiments.

[0160] Wherein, the device, computer readable storage medium, computer program product or chip provided by the embodiments are used to execute the corresponding methods provided above, so the beneficial effects that can be achieved are referred to the beneficial effects of the corresponding methods provided above, which will not be repeated here.

[0161] Through the above description of the embodiments, those skilled in the art can understand that, for the convenience and brevity of description, only the above division of functional modules is taken as an example for illustration, in actual application, the above functions can be completed by different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above.

[0162] In the embodiments of the present disclosure, it should be understood that the disclosed apparatus and method can be implemented in other ways. For example, the apparatus embodiments described above are merely schematic, and the division of the modules or units is merely a logical function division. In actual implementation, another division manner can be adopted, for example, a plurality of units or components can be combined or integrated into another apparatus, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interfaces, apparatuses or units, and can be electrical, mechanical or in other forms.

[0163] The above merely describes specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present disclosure, which should be covered by the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claims.

Claims

1. A method for controlling the flow of coolant, characterized in that: The method comprises: acquiring, in response to a target instruction, an actual intake air temperature of an intake manifold of an engine in a target vehicle and a current temperature of a low-temperature radiator in a cooling circuit of the engine, wherein the target instruction is used to instruct to maintain the actual intake air temperature of the intake manifold at a target intake air temperature; determining a first duty cycle of the electric pump in the cooling circuit based on the actual intake air temperature, the current temperature, and a first correspondence relationship, the first correspondence relationship being used to indicate a correspondence between a sample intake air temperature of the intake manifold and a sample temperature of the low-temperature radiator when the target intake air temperature is used as a target, and a first sample duty cycle of the electric pump; Based on the first duty cycle, a flow rate of coolant in the cooling circuit is controlled.

2. The method according to claim 1, characterized in that The determining, based on the actual intake air temperature, the current temperature, and the first corresponding relationship, a first duty cycle of the electric pump in the cooling circuit includes: comparing the actual intake air temperature with a plurality of sample intake air temperatures in the first corresponding relationship, and determining at least one candidate intake air temperature from the plurality of sample intake air temperatures that matches the actual intake air temperature; comparing the current temperature with at least one sample temperature corresponding to the at least one candidate intake air temperature in the first correspondence, and determining a candidate temperature matching the current temperature from the at least one sample temperature; A first sample duty cycle of the electric pump corresponding to the candidate temperature is determined as the first duty cycle.

3. The method according to claim 1 or 2, characterized in that The controlling the flow rate of the coolant in the cooling circuit based on the first duty cycle includes: When the target vehicle is in a driving state, obtaining the driving speed, driving mode and ambient temperature of the environment in which the target vehicle is located; determining a second duty cycle of the electric pump based on the driving speed, the ambient temperature, and a second correspondence relationship, the second correspondence relationship being used to indicate a correspondence between a sample driving speed of the vehicle and a sample ambient temperature of the vehicle's environment when the target intake air temperature is used as a target, and the second sample duty cycle of the electric pump; Correcting the second duty cycle based on the driving mode to obtain a first corrected duty cycle; The flow rate of the coolant is controlled based on the sum of the first duty cycle and the first corrected duty cycle.

4. The method according to claim 3, characterized in that The correcting the second duty cycle based on the driving mode to obtain a first corrected duty cycle includes: determining a correction factor based on the driving mode, the second duty cycle, and a correction correspondence, the correction factor being used to correct the second duty cycle, the correction correspondence indicating a correspondence between a sample driving mode of the vehicle and a sample correction factor when the target intake air temperature is used as a target and the second sample duty cycle is corrected; The first corrected duty cycle is determined based on a product of the second duty cycle and the correction factor.

5. The method according to claim 1 or 3, characterized in that The controlling the flow rate of the coolant in the cooling circuit based on the first duty cycle includes: Obtaining a positional relationship between an air conditioning condenser and the low-temperature radiator in the target vehicle, and a current opening of an active air intake grille in the cooling circuit; determining a second modified duty cycle based on the positional relationship and the current opening; The flow rate of the coolant is controlled based on the sum of the first duty cycle, a first modified duty cycle, and the second modified duty cycle, wherein the first modified duty cycle is determined based on the driving speed and driving mode of the target vehicle and the ambient temperature of the environment in which the target vehicle is located.

6. The method according to claim 5, characterized in that The determining of a second modified duty cycle based on the position relationship and the current opening degree includes: determining a reference duty cycle based on the current opening and a reference correspondence, wherein the reference correspondence is used to indicate a correspondence between a sample opening of the active air intake grille and a reference sample duty cycle of the electric pump when the target intake air temperature is used as a target; determining the preset duty cycle as a third duty cycle when the positional relationship indicates that the air conditioning condenser is arranged behind the low-temperature radiator; determining the third duty cycle based on an operating state of an air-conditioning compressor in the target vehicle when the positional relationship indicates that the air-conditioning condenser is arranged in front of the low-temperature radiator; The sum of the reference duty cycle and the third duty cycle is determined as the second corrected duty cycle.

7. The method according to claim 6, characterized in that The determining the third duty cycle based on the operating state of the air-conditioning compressor in the target vehicle includes: When the working state is the off state, determining the preset duty cycle as the third duty cycle; When the working state is the on state, obtaining the air-conditioning pressure in the air-conditioning system of the target vehicle; The third duty cycle is determined based on the air conditioning pressure and a third correspondence relationship indicating a correspondence relationship between the sample air conditioning pressure and a third sample duty cycle of the electric pump when the target intake air temperature is targeted.

8. A device for controlling the flow of coolant, characterized in that: The device comprises: a determination module configured to obtain, in response to a target instruction, an actual intake air temperature of an intake manifold of an engine in a target vehicle and a current temperature of a low-temperature radiator in a cooling circuit of the engine, wherein the target instruction is configured to instruct to maintain the actual intake air temperature of the intake manifold at a target intake air temperature; a determining module configured to determine a first duty cycle of the electric pump in the cooling circuit based on the actual intake air temperature, the current temperature, and a first correspondence relationship, the first correspondence relationship being configured to indicate a correspondence between a sample intake air temperature of the intake manifold and a sample temperature of the low-temperature radiator when the target intake air temperature is used as a target, and the first sample duty cycle of the electric pump; A control module is configured to control a flow rate of coolant in the cooling circuit based on the first duty cycle.

9. A computer-readable storage medium, characterized in that The computer-readable storage medium stores an executable program code, and when the executable program code is executed, the method according to any one of claims 1 to 7 is implemented.

10. A vehicle, characterized in that: The vehicle comprises: a memory for storing executable program code; A processor is configured to call and run the executable program code from the memory, so that the vehicle executes the method according to any one of claims 1 to 7.

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