Control method, apparatus and device for cooling system in engine, and storage medium

Abstract

Disclosed in the present application are a control method, apparatus and device for a cooling system in an engine, and a storage medium, wherein the cooling system in the engine comprises a water-cooled intercooler and an electronic water pump. The control method comprises: acquiring an actual air-output temperature of a water-cooled intercooler; determining whether the actual air-output temperature is within a preset temperature range; and controlling a low-pressure EGR system and / or an electronic water pump on the basis of a determination result. By means of the technical solution provided in the present application, abnormal problems of overtemperature, knocking, etc., occurring in an engine can be reduced, thereby improving the reliability of the engine.

Description

Control method, device, equipment and storage medium of engine intercooling system Technical Field

[0001] The present application relates to the field of engine technology, and in particular to a control method, device, equipment, and storage medium for an engine intercooling system. Background Art

[0002] Exhaust Gas Recirculation (EGR) technology recirculates a portion of the engine's exhaust back into the cylinders, allowing it to be burned alongside the fresh air mixture. Low-pressure EGR technology, by adding an EGR valve and optimizing calibration control, effectively increases the EGR rate, significantly reducing fuel consumption and emissions. Consequently, low-pressure EGR technology has been widely adopted in hybrid engines.

[0003] The long gas flow path in a low-pressure EGR system presents significant challenges in terms of responsiveness and transient control. To reduce exhaust gas flow hysteresis and improve transient control accuracy, engines equipped with this system require an intercooler. Currently, excessively high or low intercooler outlet temperatures can cause engine overheating, detonation, and other abnormalities, resulting in reduced engine reliability.

[0004] Summary of the Invention

[0005] The embodiments of the present application provide a control method, device, equipment and storage medium for an engine intercooler system, which can, at least to a certain extent, reduce abnormal problems such as overheating and detonation in the engine and improve the reliability of the engine.

[0006] Other features and advantages of the present application will become apparent from the following detailed description, or may be learned in part by practice of the present application.

[0007] According to a first aspect of an embodiment of the present application, a control method for an engine intercooling system is provided, wherein the engine intercooling system includes a water-cooled intercooler and an electronic water pump, and the control method includes:

[0008] Obtaining the actual outlet temperature of the water-cooled intercooler;

[0009] Determining whether the actual outlet air temperature is within a preset temperature range;

[0010] The low-pressure EGR system and / or the electronic water pump are controlled according to the judgment result.

[0011] In some embodiments of the present application, based on the aforementioned solution, the low-pressure EGR system includes an EGR valve, the preset temperature range includes a temperature less than a first target outlet temperature, and controlling the low-pressure EGR system and / or the electronic water pump according to the judgment result includes:

[0012] When the actual outlet temperature is lower than the first target outlet temperature, the EGR valve is closed, and the speed of the electronic water pump is controlled to be a preset minimum value.

[0013] In some embodiments of the present application, based on the aforementioned solution, the preset temperature range includes a temperature greater than the first target outlet temperature and less than the second target outlet temperature, and controlling the low-pressure EGR system and / or the electronic water pump according to the judgment result includes:

[0014] When the actual outlet gas temperature is greater than the first target outlet gas temperature and less than the second target outlet gas temperature, opening the EGR valve;

[0015] Determining a maximum EGR rate corresponding to the actual outlet temperature;

[0016] The EGR rate of the low-pressure EGR system is controlled to be less than a maximum EGR rate corresponding to the actual outlet temperature.

[0017] In some embodiments of the present application, based on the above solution, determining the maximum EGR rate corresponding to the actual outlet temperature includes:

[0018] Dividing the preset temperature range into a plurality of temperature intervals according to a preset step size;

[0019] generating a preset relationship curve according to each of the temperature intervals and the maximum EGR rate corresponding to the temperature interval;

[0020] Finding a target temperature range corresponding to the actual outlet temperature from the preset relationship curve;

[0021] The maximum EGR rate corresponding to the target temperature range is determined as the maximum EGR rate corresponding to the actual outlet temperature.

[0022] In some embodiments of the present application, based on the aforementioned solution, the preset temperature range includes a temperature greater than the second target outlet temperature and less than a third target outlet temperature, and controlling the low-pressure EGR system and / or the electronic water pump according to the judgment result includes:

[0023] When the actual outlet temperature is greater than the second target outlet temperature and less than the third target outlet temperature, determining whether the engine speed, engine load, water temperature and ambient temperature of the electronic water pump all meet preset start-up conditions;

[0024] When the engine speed, the engine load, the water temperature, and the ambient temperature all meet the preset opening conditions, the EGR valve is opened.

[0025] In some embodiments of the present application, based on the aforementioned solution, the preset temperature range includes a temperature greater than the third target outlet temperature, and controlling the low-pressure EGR system and / or the electronic water pump according to the judgment result includes:

[0026] When the actual outlet temperature is greater than the third target outlet temperature, the EGR valve is closed, and the speed of the electronic water pump is controlled to be a preset maximum value.

[0027] In some embodiments of the present application, based on the above solution, the control method further includes:

[0028] The rotation speed of the electronic water pump is controlled according to the actual outlet air temperature, wherein the rotation speed of the electronic water pump is negatively correlated with the actual outlet air temperature.

[0029] According to a second aspect of an embodiment of the present application, a control device for an engine intercooling system is provided, wherein the engine intercooling system includes a water-cooled intercooler and an electronic water pump, and the device includes:

[0030] a temperature acquisition unit configured to acquire an actual outlet temperature of the water-cooled intercooler;

[0031] a temperature judging unit, configured to judge whether the actual outlet air temperature is within a preset temperature range;

[0032] The control unit is configured to control the low-pressure EGR system and / or the electronic water pump according to the judgment result.

[0033] According to a third aspect of an embodiment of the present application, a control device for an engine intercooling system is provided, comprising a processor and a memory, wherein the memory stores computer program instructions that can be executed by the processor, and when the processor executes the computer program instructions, the steps of the method described in any one of the first aspects above are implemented.

[0034] According to a fourth aspect of an embodiment of the present application, a computer-readable storage medium is provided, in which computer program instructions are stored. When the computer program instructions are executed by a processor, the processor is prompted to implement the steps of the method described in any one of the first aspects above.

[0035] In this application, by obtaining the actual outlet temperature of the water-cooled intercooler, determining whether the actual outlet temperature is within a preset temperature range, and controlling the low-pressure EGR system and / or the electronic water pump based on the determination result, the technical solution provided by this application can reduce engine abnormalities such as overheating and detonation, thereby improving engine reliability.

[0036] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The accompanying drawings are incorporated into and constitute a part of the specification, illustrating embodiments consistent with the present application and, together with the specification, explaining the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can derive other drawings based on these drawings without inventive effort. In the drawings:

[0038] FIG1 shows a schematic diagram of an engine intercooling system according to an embodiment;

[0039] FIG2 is a schematic flow chart showing a method for controlling an engine intercooling system in one embodiment;

[0040] FIG3 is a schematic diagram showing a preset relationship curve in one embodiment;

[0041] FIG4 shows a block diagram of a control device for an engine intercooling system according to one embodiment;

[0042] FIG5 shows a schematic structural diagram of a control device for an engine intercooling system in one embodiment. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0044] In addition, described feature, structure or characteristic can be combined in one or more embodiments in any suitable manner.In the following description, many specific details are provided so as to provide a full understanding of the embodiments of the present application. However, it will be appreciated by those skilled in the art that the technical scheme of the present application can be put into practice without one or more of the specific details, or other methods, components, devices, steps etc. can be adopted. In other cases, known methods, devices, implementations or operations are not shown or described in detail to avoid blurring the various aspects of the application.

[0045] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically separate entities. That is, these functional entities may be implemented in software, in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0046] The flowcharts shown in the accompanying drawings are for illustrative purposes only and do not necessarily include all contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps may be decomposed, while others may be combined or partially combined. Therefore, the actual execution order may vary depending on the actual situation.

[0047] To help those skilled in the art better understand this application, we first briefly explain EGR technology. Introducing EGR technology under low-load engine conditions can reduce intake pumping losses, thereby lowering fuel consumption. Furthermore, EGR technology can lower maximum combustion temperatures, significantly reducing engine knock tendency, helping to increase engine compression ratios and advance ignition, further improving fuel consumption. With increasingly stringent fuel consumption and emission regulations, traditional vehicles need to continuously improve engine combustion thermal efficiency to remain competitive. Against this backdrop, newly developed high-thermal-efficiency engines generally incorporate EGR technology as standard. Currently, engines equipped with low-pressure EGR systems are equipped with intercoolers. If the intercooler outlet temperature is too low, a large amount of condensate can form as the exhaust gas flows through the water-cooled intercooler within the low-pressure EGR system, leading to engine misfires and abnormal jitter. In extremely cold weather, this large amount of condensate can cause the throttle to stick, resulting in engine failure. If the intercooler outlet temperature is too high, the engine can experience engine knock, and the low-pressure EGR system cannot achieve its intended energy-saving and emission-reduction effects.

[0048] The following briefly describes the engine intercooling system involved in this application, with reference to Figure 1. As shown in Figure 1, the engine intercooling system may include a water-cooled intercooler, cooling piping, an electronic water pump, a low-temperature radiator, a supercharger, and an intake manifold. The exhaust gas flow path of the low-pressure EGR system is as follows: the exhaust gas first enters the supercharger and mixes with fresh air, then enters the internal gas channel of the water-cooled intercooler. After being cooled by the coolant inside the water-cooled intercooler, it passes through the intake manifold and enters the cylinder to participate in the combustion process.

[0049] The engine intercooler system's cooling principle is as follows: the intercooler cooling circuit is independently controlled from the engine cooling circuit. The coolant flow in the intercooler cooling circuit is controlled by an electronic water pump in the cooling lines. The coolant flow rate is controlled by adjusting the speed of the electronic water pump. After the coolant passes through the low-temperature radiator, its temperature drops. The low-temperature coolant then flows through the cooling lines into the water-cooled intercooler, exchanging heat with the gas in the intercooler's air-side channels, cooling the gas to below the target temperature. Simultaneously, the coolant absorbs heat, causing the temperature to rise. The coolant then flows through the cooling lines into the low-temperature radiator, where it cools down, completing the circulation process.

[0050] FIG2 is a flow chart showing a method for controlling an engine intercooling system according to an embodiment of the present invention. The engine intercooling system includes a water-cooled intercooler and an electronic water pump. As shown in FIG2 , the method for controlling the engine intercooling system may include the following steps 201 to 203 .

[0051] Step 201: Obtain the actual outlet temperature of the water-cooled intercooler.

[0052] During implementation, a temperature sensor may be provided near the outlet of the water-cooled intercooler, and the electronic control unit (ECU) of the vehicle obtains the actual outlet temperature of the water-cooled intercooler from the temperature sensor.

[0053] Step 202: Determine whether the actual outlet air temperature is within a preset temperature range.

[0054] It is understandable that the preset temperature range can be obtained based on bench calibration, and the preset temperature range can be divided differently according to the different effects of the actual exhaust temperature on the engine.

[0055] The preset temperature range may be lower than the first target outlet temperature, higher than the first target outlet temperature and lower than the second target outlet temperature, higher than the second target outlet temperature and lower than the third target outlet temperature, or higher than the third target outlet temperature. The first target outlet temperature, the second target outlet temperature, and the third target outlet temperature increase in sequence.

[0056] Specifically, when the preset temperature range is less than the first target outlet temperature, if the actual outlet temperature is within the preset temperature range, the actual outlet temperature is less than the first target outlet temperature; when the preset temperature range is greater than the first target outlet temperature and less than the second target outlet temperature, if the actual outlet temperature is within the preset temperature range, the actual outlet temperature is greater than the first target outlet temperature and less than the second target outlet temperature; when the preset temperature range is greater than the second target outlet temperature and less than the third target outlet temperature, if the actual outlet temperature is within the preset temperature range, the actual outlet temperature is greater than the second target outlet temperature and less than the third target outlet temperature; when the preset temperature range is greater than the third target outlet temperature, if the actual outlet temperature is within the preset temperature range, the actual outlet temperature is greater than the third target outlet temperature.

[0057] Step 203: Control the low-pressure EGR system and / or the electronic water pump according to the judgment result.

[0058] Specifically, the low-pressure EGR system includes an EGR valve. Controlling the low-pressure EGR system may include controlling the EGR valve to open or close. Controlling the electronic water pump may include controlling the speed of the electronic water pump.

[0059] It is understandable that, depending on the judgment result, the ECU may control only the low-pressure EGR system, only the electronic water pump, or both the low-pressure EGR system and the electronic water pump.

[0060] In some embodiments, the preset temperature range includes a temperature lower than a first target outlet temperature, and the low-pressure EGR system and / or the electronic water pump are controlled according to the judgment result, including: when the actual outlet temperature is lower than the first target outlet temperature, closing the EGR valve and controlling the speed of the electronic water pump to a preset minimum value.

[0061] It is understandable that if the actual outlet temperature is lower than the first target outlet temperature, closing the EGR valve can avoid the use of the low-pressure EGR system when the actual outlet temperature is low, which may cause the exhaust gas to flow through the water-cooled intercooler and generate a large amount of condensate, thereby avoiding the throttle valve from freezing and sticking and the engine from misfire, thereby ensuring the reliable use of the engine and components.

[0062] The preset minimum value may be zero or another smaller value. By controlling the speed of the electronic water pump to zero, the blades of the electronic water pump will stop, and thus there will be no pressure difference in the cooling pipe, the coolant will not flow, and the actual outlet temperature of the water-cooled intercooler will gradually increase.

[0063] In other embodiments, the preset temperature range includes a temperature greater than the first target outlet temperature and less than the second target outlet temperature, and the low-pressure EGR system and / or the electronic water pump are controlled according to the judgment result, including: opening the EGR valve when the actual outlet temperature is greater than the first target outlet temperature and less than the second target outlet temperature; determining the maximum EGR rate corresponding to the actual outlet temperature; and controlling the EGR rate of the low-pressure EGR system to be less than the maximum EGR rate corresponding to the actual outlet temperature.

[0064] It should be noted that when the actual outlet temperature is greater than the first target outlet temperature and less than the second target outlet temperature, the ECU controls the EGR valve to open, allowing exhaust gas to flow through the low-pressure EGR system and activating the EGR system. Within this preset temperature range, the risk of condensation in the low-pressure EGR system still exists. Therefore, the EGR rate at each operating point must be limited to less than the EGR rate corresponding to the actual outlet temperature. This reduces the exhaust gas flow in the low-pressure EGR system and, therefore, keeps the amount of condensate within a reasonable range.

[0065] During the implementation process, the preset temperature range can be divided into multiple temperature intervals according to a preset step size; a preset relationship curve is generated based on each temperature interval and the maximum EGR rate corresponding to the temperature interval; the target temperature interval corresponding to the actual outlet temperature is found from the preset relationship curve; and the maximum EGR rate corresponding to the target temperature interval is determined as the maximum EGR rate corresponding to the actual outlet temperature.

[0066] FIG3 shows a schematic diagram of a preset relationship curve in one embodiment. As shown in FIG3 , assuming the first target outlet temperature is 70°C and the second target outlet temperature is 100°C, the preset temperature range can be divided into three temperature intervals in 10°C increments: (70°C-80°C), (80°C-90°C), and (90°C-100°C). The maximum EGR rate corresponding to each temperature interval can be obtained through bench calibration testing. Specifically, during the calibration test, the engine's optimal ignition advance angle, engine combustion uniformity index, and engine misfire rate can be monitored to perform universal characteristic calibration within the operating conditions of the low-pressure EGR system. The EGR rate is optimized and adjusted within the preset conditions when these parameters meet the preset conditions. The maximum EGR rate is obtained while the engine performance meets the standard. After obtaining the maximum EGR rate corresponding to each temperature interval, the maximum EGR rates are connected to obtain the preset relationship curve. This preset relationship curve represents the corresponding relationship between different temperature intervals and the maximum EGR rate.

[0067] By dividing the preset temperature range into multiple temperature intervals, then searching for the corresponding maximum EGR rate based on the target temperature interval corresponding to the actual outlet temperature, and finally controlling the EGR rate of the low-pressure EGR system based on the found maximum EGR rate, precise control of the EGR rate is achieved. While reducing the amount of condensate in the low-pressure EGR system, the optimal fuel consumption reduction effect is achieved, achieving a balance between fuel consumption benefits and engine reliability.

[0068] In other embodiments, the preset temperature range includes a temperature greater than the second target outlet temperature and less than the third target outlet temperature, and the low-pressure EGR system and / or the electronic water pump are controlled according to the judgment result, including: when the actual outlet temperature is greater than the second target outlet temperature and less than the third target outlet temperature, judging whether the engine speed, engine load, water temperature of the electronic water pump and ambient temperature all meet the preset opening conditions; when the engine power, engine torque, water temperature and ambient temperature all meet the preset opening conditions, opening the EGR valve.

[0069] It is understood that if the actual outlet temperature is greater than the second target outlet temperature and less than the third target outlet temperature, the operating state of the low-pressure EGR system is not limited by the actual outlet temperature. In this case, the EGR valve can be controlled to open or close based on whether the engine speed, engine load, electronic water pump water temperature, and ambient temperature all meet the preset opening conditions.

[0070] When the engine speed, engine load, water temperature of the electronic water pump, and ambient temperature all meet the preset opening conditions, the EGR valve is controlled to open; otherwise, the EGR valve is controlled to close. The preset opening conditions can be set according to the engine operating status during engine calibration.

[0071] Specifically, assuming that during engine calibration, the engine speed is less than a first limit (such as 1500 rpm) or greater than a second limit (such as 5500 rpm), the activation of the low-pressure EGR system may cause unstable engine combustion and misfire problems. The preset activation condition may include the engine speed being between the first limit and the second limit, that is, when the engine speed meets the preset activation condition, the EGR valve is opened to avoid engine misfire problems.

[0072] Assuming that during engine calibration, when the engine load is less than the third limit (for example, 5 bar) or greater than the fourth limit (for example, 18 bar), the opening of the low-pressure EGR system may cause unstable engine combustion and misfire problems. The preset opening condition may include the engine load being between the third limit and the fourth limit, that is, when the engine load meets the preset opening condition, the EGR valve is opened to avoid engine misfire problems.

[0073] Assuming that when the engine is calibrated, the water temperature of the electronic water pump is lower than the fifth limit (for example, 40°C) and the low-pressure EGR system is turned on, the engine will have obvious misfire vibration. When the water temperature is higher than the sixth limit (for example, 120°C) and the low-pressure EGR system is turned on, it will cause engine knock problems. The preset opening conditions may include the water temperature being between the fifth limit and the sixth limit, that is, when the water temperature meets the preset opening conditions, the EGR valve is opened to avoid engine misfire vibration and knock problems.

[0074] Assuming that when the engine is calibrated, the ambient temperature is less than the seventh limit (for example, -10°C) and the low-pressure EGR system is turned on, the water vapor in the exhaust gas will generate condensed water when it is cooled, and then freeze and block the cooling pipe when it is started next time. The preset opening condition may include the ambient temperature being greater than the seventh limit, that is, when the ambient temperature meets the preset opening condition, the EGR valve is opened to avoid blockage of the cooling pipe.

[0075] In some embodiments, the preset temperature range includes a temperature greater than a third target outlet temperature, and the low-pressure EGR system and / or the electronic water pump are controlled based on the judgment result, including: when the actual outlet temperature is greater than the third target outlet temperature, closing the EGR valve and controlling the speed of the electronic water pump to a preset maximum value.

[0076] It can be understood that when the actual outlet temperature is greater than the third target outlet temperature, the actual outlet temperature is at a higher level. At this time, the ECU controls the EGR valve to close and controls the speed of the electronic water pump to the maximum value, which can make the coolant flow speed in the cooling pipe the fastest, realize rapid heat exchange, and thus make the actual outlet temperature no longer continue to rise.

[0077] In some embodiments, the control method of the engine intercooling system may further include: controlling the rotation speed of the electronic water pump according to the actual outlet air temperature, wherein the rotation speed of the electronic water pump is negatively correlated with the actual outlet air temperature.

[0078] It is understandable that the speed of the electronic water pump can be controlled simultaneously with the control of the low-pressure EGR system, that is, while adjusting the EGR valve, the speed of the electronic water pump is dynamically adjusted according to the actual outlet temperature.

[0079] Specifically, when the actual outlet temperature is low, the speed of the electronic water pump can be controlled to zero, or the electronic water pump can be controlled to run at a low speed; when the actual outlet temperature is high, the electronic water pump can be controlled to run at a high speed or full speed to achieve the optimal outlet temperature under different engine operating conditions.

[0080] By dynamically adjusting the speed of the electronic water pump, the engine's power and economy can meet the design goals, while ensuring that the engine does not have abnormal problems such as overheating and detonation, thereby ensuring the reliable use of the engine.

[0081] This embodiment of the application obtains the actual outlet temperature of a water-cooled intercooler; determines whether the actual outlet temperature is within a preset temperature range; and controls the low-pressure EGR system and / or electronic water pump based on the determination result. The technical solution provided by this application can reduce engine abnormalities such as overheating and detonation, thereby improving engine reliability.

[0082] The following describes an embodiment of the device of the present application, which can be used to implement the control method of the engine intercooler system described in the above-mentioned embodiment of the present application. For details not disclosed in the embodiment of the device of the present application, please refer to the embodiment of the control method of the engine intercooler system described in the above-mentioned embodiment of the present application.

[0083] 4 , there is shown a block diagram of a control device for an engine intercooling system in an embodiment of the present application.

[0084] As shown in Figure 4, the control device of the engine intercooling system of the embodiment of the present application, the engine intercooling system includes a water-cooled intercooler and an electronic water pump, and the control device of the engine intercooling system includes: a temperature acquisition unit 401, a temperature judgment unit 402 and a control unit 403, wherein the temperature acquisition unit 401 is configured to obtain the actual outlet temperature of the water-cooled intercooler; the temperature judgment unit 402 is configured to judge whether the actual outlet temperature is within a preset temperature range; the control unit 403 is configured to control the low-pressure EGR system and / or the electronic water pump according to the judgment result.

[0085] In some embodiments of the present application, based on the aforementioned scheme, the low-pressure EGR system includes an EGR valve, the preset temperature range includes less than a first target outlet temperature, and the control unit 403 is also configured to close the EGR valve and control the speed of the electronic water pump to a preset minimum value when the actual outlet temperature is less than the first target outlet temperature.

[0086] In some embodiments of the present application, based on the aforementioned scheme, the preset temperature range includes greater than the first target outlet temperature and less than the second target outlet temperature, and the control unit 403 is also configured to open the EGR valve when the actual outlet temperature is greater than the first target outlet temperature and less than the second target outlet temperature; determine the maximum EGR rate corresponding to the actual outlet temperature; and control the EGR rate of the low-pressure EGR system to be less than the maximum EGR rate corresponding to the actual outlet temperature.

[0087] In some embodiments of the present application, based on the aforementioned scheme, the control unit 403 is also configured to divide the preset temperature range into multiple temperature intervals according to a preset step size; generate a preset relationship curve based on each temperature interval and the maximum EGR rate corresponding to the temperature interval; search the target temperature interval corresponding to the actual outlet temperature from the preset relationship curve; and determine the maximum EGR rate corresponding to the target temperature interval as the maximum EGR rate corresponding to the actual outlet temperature.

[0088] In some embodiments of the present application, based on the aforementioned scheme, the preset temperature range includes a temperature greater than the second target outlet temperature and less than the third target outlet temperature, and the control unit 403 is also configured to determine whether the engine speed, engine load, water temperature of the electronic water pump and ambient temperature all meet the preset opening conditions when the actual outlet temperature is greater than the second target outlet temperature and less than the third target outlet temperature; and open the EGR valve when the engine speed, engine load, water temperature and ambient temperature all meet the preset opening conditions.

[0089] In some embodiments of the present application, based on the aforementioned scheme, the preset temperature range includes a temperature greater than a third target outlet temperature, and the control unit 403 is further configured to close the EGR valve and control the speed of the electronic water pump to a preset maximum value when the actual outlet temperature is greater than the third target outlet temperature.

[0090] In some embodiments of the present application, based on the above solution, the control unit 403 is further configured to control the speed of the electronic water pump according to the actual outlet air temperature, wherein the speed of the electronic water pump is negatively correlated with the actual outlet air temperature.

[0091] Based on the same inventive concept, an embodiment of the present application further provides a control device for an engine intercooling system. Referring to FIG5 , a schematic structural diagram of the control device for an engine intercooling system in an embodiment of the present application is shown. The control device for the engine intercooling system includes one or more memories 504, one or more processors 502, and at least one computer program (computer program instruction) stored in the memory 504 and executable on the processor 502. When the processor 502 executes the computer program, the method described above is implemented.

[0092] In FIG5 , a bus architecture (represented by bus 500) is shown. Bus 500 may include any number of interconnected buses and bridges. Bus 500 links various circuits together, including one or more processors represented by processor 502 and memory represented by memory 504. Bus 500 may also link various other circuits together, such as peripherals, voltage regulators, and power management circuits, all of which are well known in the art and, therefore, will not be described further herein. Bus interface 505 provides an interface between bus 500 and receiver 501 and transmitter 503. Receiver 501 and transmitter 503 may be the same component, namely a transceiver, providing a unit for communicating with various other devices over a transmission medium. Processor 502 is responsible for managing bus 500 and general processing, while memory 504 may be used to store data used by processor 502 when performing operations.

[0093] Based on the same inventive concept, an embodiment of the present application provides a computer-readable storage medium, in which computer program instructions are stored. When the computer program instructions are executed by a processor, the processor is prompted to implement the steps of the method as described above.

[0094] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored as one or more instructions or codes on or transmitted via a computer-readable medium. Other examples and implementations are within the scope and spirit of this application and the appended claims. For example, due to the nature of software, the functions described above may be implemented using software executed by a processor, hardware, firmware, hardwiring, or a combination of any of these. Furthermore, the functional units may be integrated into a single processing unit, each unit may exist physically separately, or two or more units may be integrated into a single unit.

[0095] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only exemplary. For example, the division of the units can be a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0096] The units described as separate components may or may not be physically separate, and the components of the control device may or may not be physical units, that is, they may be located in one place or distributed across multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0097] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for enabling a computer device (which can be a personal computer, a server or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk, etc. Various media that can store computer program instructions.

[0098] The foregoing is merely an embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of the claims of the present application.

Claims

1. A control method for an engine intercooling system, characterized in that: The engine intercooling system includes a water-cooled intercooler and an electronic water pump, and the control method includes: Obtaining the actual outlet temperature of the water-cooled intercooler; Determining whether the actual outlet temperature is within a preset temperature range; The low-pressure exhaust gas recirculation (EGR) system and / or the electronic water pump are controlled according to the judgment result.

2. The control method of the engine intercooling system according to claim 1, characterized in that: The low-pressure EGR system includes an EGR valve, the preset temperature range includes a temperature less than a first target outlet temperature, and the low-pressure EGR system and / or the electronic water pump are controlled according to the judgment result, including: When the actual outlet temperature is lower than the first target outlet temperature, the EGR valve is closed, and the rotation speed of the electronic water pump is controlled to be a preset minimum value.

3. The control method of the engine intercooling system according to claim 2, characterized in that: The preset temperature range includes a temperature greater than the first target outlet temperature and less than the second target outlet temperature, and the controlling of the low-pressure EGR system and / or the electronic water pump according to the judgment result includes: When the actual outlet temperature is greater than the first target outlet temperature and less than the second target outlet temperature, opening the EGR valve; Determining a maximum EGR rate corresponding to the actual outlet temperature; The EGR rate of the low-pressure EGR system is controlled to be less than the maximum EGR rate corresponding to the actual outlet temperature.

4. The control method of the engine intercooling system according to claim 3, characterized in that: The determining of the maximum EGR rate corresponding to the actual outlet temperature includes: Dividing the preset temperature range into a plurality of temperature intervals according to a preset step length; generating a preset relationship curve according to each of the temperature intervals and the maximum EGR rate corresponding to the temperature interval; Finding the target temperature range corresponding to the actual outlet temperature from the preset relationship curve; The maximum EGR rate corresponding to the target temperature range is determined as the maximum EGR rate corresponding to the actual exhaust temperature. Maximum EGR rate.

5. The control method of the engine intercooling system according to claim 3, characterized in that: The preset temperature range includes a temperature greater than the second target outlet temperature and less than the third target outlet temperature, and the controlling of the low-pressure EGR system and / or the electronic water pump according to the judgment result includes: When the actual outlet temperature is greater than the second target outlet temperature and less than the third target outlet temperature, determining whether the engine speed, engine load, water temperature and ambient temperature of the electronic water pump all meet the preset start-up conditions; When the engine speed, the engine load, the water temperature and the ambient temperature all meet the preset opening conditions, the EGR valve is opened.

6. The control method of the engine intercooling system according to claim 4, characterized in that: The preset temperature range includes a temperature greater than the third target outlet temperature, and the controlling of the low-pressure EGR system and / or the electronic water pump according to the judgment result includes: When the actual outlet temperature is greater than the third target outlet temperature, the EGR valve is closed, and the speed of the electronic water pump is controlled to be a preset maximum value.

7. The control method of the engine intercooling system according to claim 1, characterized in that: The control method further comprises: The rotation speed of the electronic water pump is controlled according to the actual outlet air temperature, wherein the rotation speed of the electronic water pump is negatively correlated with the actual outlet air temperature.

8. The control method of the engine intercooling system according to claim 2, characterized in that: The control method further comprises: The rotation speed of the electronic water pump is controlled according to the actual outlet air temperature, wherein the rotation speed of the electronic water pump is negatively correlated with the actual outlet air temperature.

9. The control method of the engine intercooling system according to claim 3, characterized in that: The control method further comprises: The speed of the electronic water pump is controlled according to the actual outlet temperature, wherein the speed of the electronic water pump The rotation speed is negatively correlated with the actual outlet gas temperature.

10. The control method of the engine intercooling system according to claim 4, characterized in that: The control method further comprises: The rotation speed of the electronic water pump is controlled according to the actual outlet air temperature, wherein the rotation speed of the electronic water pump is negatively correlated with the actual outlet air temperature.

11. The control method of the engine intercooling system according to claim 5, characterized in that: The control method further comprises: The rotation speed of the electronic water pump is controlled according to the actual outlet air temperature, wherein the rotation speed of the electronic water pump is negatively correlated with the actual outlet air temperature.

12. The control method of the engine intercooling system according to claim 6, characterized in that: The control method further comprises: The rotation speed of the electronic water pump is controlled according to the actual outlet air temperature, wherein the rotation speed of the electronic water pump is negatively correlated with the actual outlet air temperature.

13. A control device for an engine intercooling system, characterized in that: The engine intercooling system includes a water-cooled intercooler and an electronic water pump, and the device includes: a temperature acquisition unit, configured to acquire an actual outlet temperature of the water-cooled intercooler; a temperature judging unit, configured to judge whether the actual outlet air temperature is within a preset temperature range; The control unit is configured to control the low-pressure EGR system and / or the electronic water pump according to the judgment result.

14. A control device for an engine intercooling system, comprising a processor and a memory, characterized in that: The memory stores computer program instructions that can be executed by the processor, and when the processor executes the computer program instructions, the steps of the method according to any one of claims 1 to 12 are implemented.

15. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer program instructions, which, when executed by a processor, prompt the processor to implement the steps of the method according to any one of claims 1 to 12.

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