Cooling system, control method and vehicle

Abstract

The embodiment of the application discloses a cooling system, a control method and a carrier, and belongs to the technical field of engines. The cooling system comprises an engine, a water pump, a radiator, an engine intercooling controller, a motor controller, a three-way proportional valve and a control unit. The radiator is connected with the water pump, the engine is connected with the radiator through a connecting channel between the radiator and the water pump, the engine intercooling controller is connected with the radiator, and the motor controller is connected with the radiator. The three-way proportional valve is connected with the water pump, the engine intercooling controller and the motor controller respectively. The control unit is used for controlling a water pump opening proportion of the water pump and a valve opening proportion of the three-way proportional valve based on the temperature of gas cooled by the intercooler in an engine intake system.

Description

TECHNICAL FIELD

[0001] The embodiment of the present application relates to the engine technical field, in particular to a cooling system, a control method and a carrier. BACKGROUND

[0002] With the increasingly emerging energy problem, energy saving and environmental protection have become an important direction of the development of the automobile industry, and hybrid electric vehicles (also known as hybrid vehicles) are gradually popularized.

[0003] And under the environmental temperature 0~35℃ climate condition, a large amount of water vapor is converted into condensed water through the intercooler cooling after the hybrid vehicle engine runs stably for a period of time, and the condensed water accumulated in the intercooler and the intake manifold will be instantly flushed into the cylinder, causing the engine misfire. SUMMARY

[0004] The embodiment of the present application provides a cooling system, a control method and a carrier, and the technical scheme is as follows.

[0005] In one aspect, the embodiment of the present application provides a cooling system, which comprises an engine, a water pump, a radiator, an engine intercooler controller, a motor controller, a three-way proportional valve and a control unit.

[0006] The radiator is connected with the water pump, the engine is connected with the radiator through a connecting passage between the radiator and the water pump, the engine intercooler controller is connected with the radiator, and the motor controller is connected with the radiator; the three-way proportional valve is connected with the water pump, the engine intercooler controller and the motor controller respectively.

[0007] The control unit is used for controlling the water pump opening proportion of the water pump and the valve opening proportion of the three-way proportional valve based on the temperature of the gas cooled by the intercooler in the engine intake system.

[0008] In another aspect, the embodiment of the present application provides a control method, which is used for a cooling system comprising an engine, a water pump, a radiator, an engine intercooler controller, a motor controller, a three-way proportional valve and a control unit.

[0009] The radiator is connected with the water pump, the engine is connected with the radiator through a connecting passage between the radiator and the water pump, the engine intercooler controller is connected with the radiator, and the motor controller is connected with the radiator; the three-way proportional valve is connected with the water pump, the engine intercooler controller and the motor controller respectively.

[0010] The method comprises:

[0011] Based on the temperature of the gas after the intercooler in the engine intake system, the control unit controls the water pump opening ratio of the water pump and the valve opening ratio of the three-way proportional valve.

[0012] In another aspect, the embodiment of the present application provides a vehicle comprising the cooling system according to the above aspect.

[0013] In the embodiment of the present application, by connecting the water pump, the engine intercooling controller and the motor controller through the three-way proportional valve in the cooling system, the water pump opening ratio of the water pump and the valve opening ratio of the three-way proportional valve can be controlled in real time according to the temperature of the gas after the intercooler in the engine intake system, so as to indirectly adjust the flow of the cooling liquid into the engine in the cooling cycle, thereby avoiding the problem of engine misfire caused by a large amount of cooling liquid entering the engine. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0015] Figure 1 A flow chart of the engine misfire reason provided by an exemplary embodiment of the present application is shown;

[0016] Figure 2 A structural schematic diagram of the cooling system in the related art is shown;

[0017] Figure 3 A structural schematic diagram of the cooling system provided by an exemplary embodiment of the present application is shown;

[0018] Figure 4 A flow chart of setting the water pump opening ratio and the valve opening ratio under different temperature differences provided by an exemplary embodiment of the present application is shown;

[0019] Figure 5 A flow chart of the control method provided by an exemplary embodiment of the present application is shown. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the present application more clear, the embodiments of the present application will be further described in detail below with reference to the drawings.

[0021] The exemplary embodiments will be described in detail herein with reference to the attached drawings. The description herein refers to the accompanying drawings, which show by way of illustration various embodiments of the application. The description herein makes reference to the accompanying drawings in which like reference numbers refer to like elements throughout the several views. The following description is not intended for limiting the application, but is merely an example of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0022] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0023] It will be understood that, although the terms first, second, etc. can be used herein to describe various information, these terms are not intended to denote a temporal or chronological order. Rather, these terms are used only to distinguish one from another. For example, a first parameter can be termed a second parameter, and, similarly, a second parameter can be termed a first parameter, without departing from the scope of the present application. As used herein, the word "if' can be interpreted to mean "when" or "upon" or "in response to determining" taking into account the context in which the term is used.

[0024] First, a brief introduction to the terms involved in the embodiments of the present application:

[0025] Engine: The core component of cars and other types of vehicles, primarily responsible for converting the chemical energy of fuel into mechanical energy, thereby driving the vehicle in motion.

[0026] Water pump: A key component in the cooling system, the water pump pumps coolant from the radiator (or water tank) to the engine, and then returns from the engine to the radiator, forming a continuous cycle. Through the circulation of coolant, the water pump helps the engine maintain a stable temperature during operation, avoiding overheating. In addition, the circulating coolant can also reduce corrosion and fouling inside the engine, extending the service life of the engine.

[0027] Radiator: Through its internal pipe and fin structure, it increases the surface area of the coolant in contact with the air, effectively dissipating the heat generated by the engine. Radiators are usually made of aluminum or copper, which have good thermal conductivity, helping to improve the efficiency of heat dissipation.

[0028] Engine Intercooler Controller (Water Charged Air Cooling, WCAC): Responsible for controlling the operation of the intercooler to improve engine efficiency and performance. The intercooler controller regulates the cooling effect of the intercooler by adjusting the coolant flow rate to adapt to different engine loads and operating conditions.

[0029] Microcontroller Unit (MCU): An important electronic device in hybrid vehicles, responsible for managing the power output and operating status of the electric motor to ensure that the electric motor works in coordination with the internal combustion engine to provide optimal power performance and fuel efficiency.

[0030] Please refer to Figure 1 It illustrates a flowchart of the cause of engine misfire provided in an exemplary embodiment of this application.

[0031] When the ambient temperature is between 0 and 35°C, the air humidity is relatively high, which increases the water content of the gas in the engine's intake system. The water content of the exhaust gas in the EGR (Exhaust Gas Recirculation) system also increases. As a result, after being pressurized by the turbocharger, the gas pressure, water vapor content, and dew point temperature increase. Then, the gas exiting the turbocharger passes through the intercooler, where the cooling medium (such as coolant or air) carries away the heat from the compressed gas, thereby lowering the gas temperature.

[0032] When the intake air temperature after intercooling is lower than the dew point temperature, the gas in the intake manifold will condense into liquid water, forming condensate. This condensate then enters the engine cylinders in large quantities, reducing combustion efficiency. The additional moisture also dilutes the fuel, affecting the quality of the air-fuel mixture and the combustion process, and can even cause misfires. In particular, because the intake duct is relatively close to the fourth cylinder when air enters the engine through the intake manifold, this often directly leads to misfires in the fourth cylinder.

[0033] Please refer to Figure 2 It shows a schematic diagram of the cooling system in the related technology. Figure 2 The cooling system includes an engine 201, a water pump 202, a radiator 203, an engine intercooler controller 204, and a motor controller 205.

[0034] The radiator 203 is connected to the water pump 202. The engine 201 is connected to the radiator 203 through the connection passage between the radiator 203 and the water pump 202. The radiator 203 is connected to the engine intercooler controller 204 and the motor controller 205 through a T-tube. The water pump 202 is connected to the engine intercooler controller 204 and the motor controller 205 through a T-tube.

[0035] That is, in the related art, after the water pump 202 draws out the cooling liquid from the radiator 203, the cooling liquid flows to the water pump 202 and the engine 201 through the pipes, respectively, wherein the cooling liquid passing through the water pump 202 is further divided into the pipe where the engine intercooler controller 204 is located and the pipe where the motor controller 205 is located, and then flows back to the radiator 203 after circulation.

[0036] It can be seen that the flow of the cooling liquid in each pipe is not effectively controlled in the related art. That is, the temperature change of the intake air temperature is not considered in the related art, and the fixed liquid distribution ratio is directly used to control the circulation of the cooling liquid in each pipe, so that when the intake air temperature decreases and the water vapor content in the gas increases, the cooling liquid entering the engine also gradually increases, thereby causing the engine misfire problem.

[0037] In the embodiment of the present application, a three-way proportional valve is added between the water pump and the engine intercooler controller and the motor controller, and a control unit is used to control the water pump opening ratio of the water pump and the valve opening ratio of the three-way proportional valve according to the temperature of the gas after being cooled by the intercooler in the engine intake system, so as to adjust the flow of the cooling liquid in each pipe of the cooling system in real time, and avoid the problem of engine misfire caused by a large amount of cooling liquid entering the engine.

[0038] Please refer to Figure 3 which shows a structure diagram of a cooling system provided by an example embodiment of the present application. The cooling system includes an engine 301, a water pump 302, a radiator 303, an engine intercooler controller 304, a motor controller 305, a three-way proportional valve 306, and a control unit.

[0039] The radiator 303 is connected to the water pump 302, the engine 301 is connected to the radiator 303 through the connecting passage between the radiator 303 and the water pump 302, the engine intercooler controller 304 is connected to the radiator 303, and the motor controller 305 is connected to the radiator 303; the three-way proportional valve 306 is connected to the water pump 302, the engine intercooler controller 304, and the motor controller 305, respectively.

[0040] The control unit is used to control the water pump opening ratio of the water pump 302 and the valve opening ratio of the three-way proportional valve 306 based on the temperature of the gas after being cooled by the intercooler in the engine intake system.

[0041] Optionally, the engine intake system is responsible for introducing air into the engine, mixing with fuel to form combustible mixture, and then burning in the engine to generate power. Optionally, the engine intake system includes air cleaner, intake duct, supercharger, intercooler, intake manifold, intake temperature sensor, intake flow sensor, emission control device, etc.

[0042] Optionally, the supercharger is used to increase the intake pressure, thereby increasing the intake density and the power output of the engine. Optionally, the intercooler is used to reduce the temperature of the compressed air, thereby improving the intake efficiency and the performance of the engine.

[0043] Optionally, after the gas in the engine intake system is pressurized by the supercharger, the gas pressure increases, the water vapor content increases, and the dew point temperature increases. Then the gas coming out of the supercharger passes through the intercooler, and the heat in the compressed gas is taken away by the cooling medium (such as coolant or air) in the intercooler to reduce the temperature of the gas. In the case where the intake temperature after intercooling is less than the dew point temperature, the gas in the intake manifold will condense into liquid water, forming condensed water, which will cause a large amount of condensed water to enter the engine cylinder, resulting in reduced combustion efficiency in the cylinder, and the additional water will also dilute the fuel, affecting the quality of the mixture and the combustion process, and even causing the engine to misfire.

[0044] Therefore, in order to effectively control the flow of liquid into the engine, in some embodiments, the control unit controls the water pump opening ratio of the water pump 302 and the valve opening ratio of the three-way proportional valve 306 according to the temperature of the gas cooled by the intercooler in the engine intake system.

[0045] Optionally, the control unit can be an ECU (Electronic Control Unit), or other control unit capable of controlling the water pump and the three-way proportional valve, and the embodiments of the present application do not limit this.

[0046] It should be noted that, Figure 3 Only the connection mode of the liquid conduit between the various components in the cooling system is shown, that is, the control circuit connection relationship between the control unit and the water pump and the three-way proportional valve is not shown.

[0047] Optionally, the ECU can be used to control the ignition timing, fuel injection amount, intake and exhaust system, etc. of the engine in addition to controlling the water pump and the three-way proportional valve.

[0048] Optionally, the water pump 302 is an electronic water pump, and the control unit can control the water pump opening ratio of the water pump 302 by directly adjusting the motor speed of the water pump 302.

[0049] Optionally, the control unit can control the valve opening ratio of the three-way proportional valve 306 through a control signal. In one possible implementation, the three-way proportional valve 306 is a three-way electromagnetic valve, and the three-way proportional valve 306 adjusts its internal mechanical structure after receiving the control signal sent by the control unit, so as to adjust the valve opening ratio.

[0050] Optionally, the three-way proportional valve 306 is connected with the water pump 302, the engine intercooler controller 304, and the motor controller 305 respectively. Adjusting the valve opening ratio of the three-way proportional valve 306 is equivalent to adjusting the liquid flow rate between the water pump 302 and the three-way proportional valve 306, the liquid flow rate between the engine intercooler controller 304 and the three-way proportional valve 306, and the liquid flow rate between the motor controller 305 and the three-way proportional valve 306.

[0051] In addition, since the engine 301 is connected with the radiator 303 through the connecting passage between the radiator 303 and the water pump 302, in the case that the liquid flow rate extracted from the radiator 303 by the water pump 302 is a constant value, the smaller the liquid flow rate between the water pump 302 and the three-way proportional valve 306 is, the larger the liquid flow rate entering the engine 301 through the connecting passage is, and vice versa.

[0052] In one possible implementation, in the case that the temperature of the gas cooled by the intercooler in the engine intake system is too low, that is, there is a large amount of condensed water in the gas entering the engine through the intake manifold from the intercooler, at this time, in order to avoid engine misfire, it is necessary to reduce the liquid flow rate entering the engine, therefore, the control unit can increase the liquid flow rate between the water pump 302 and the three-way proportional valve 306 by controlling the water pump opening ratio of the water pump and the valve opening ratio of the three-way proportional valve, so as to reduce the liquid flow rate entering the engine 301 through the connecting passage.

[0053] Furthermore, in the case that the liquid flow rate entering the engine 301 is small, the liquid in the engine 301 can be evaporated faster during the heat cycle of the engine, so that the probability of engine misfire is reduced.

[0054] In summary, in the embodiment of the present application, by connecting the water pump, the engine intercooler controller, and the motor controller in the cooling system through the three-way proportional valve, the water pump opening ratio of the water pump and the valve opening ratio of the three-way proportional valve can be controlled in real time according to the temperature of the gas cooled by the intercooler in the engine intake system, so as to indirectly adjust the cooling liquid flow rate entering the engine in the cooling cycle, and avoid the problem of engine misfire caused by a large amount of cooling liquid entering the engine.

[0055] In some embodiments, after adding the three-way proportional valve between the water pump, the engine intercooler controller and the motor controller, the valve opening proportion of different interfaces of the three-way proportional valve can be adjusted respectively.

[0056] Optionally, the three-way proportional valve includes three interfaces. The first interface is connected with the water pump, the second interface is connected with the engine intercooler controller, and the third interface is connected with the motor controller. Optionally, the control unit controls the valve opening proportion of the three-way proportional valve, which is equivalent to controlling the first valve opening proportion corresponding to the first interface, the second valve opening proportion corresponding to the second interface and the third valve opening proportion corresponding to the third interface of the three-way proportional valve.

[0057] Optionally, the first interface of the three-way proportional valve can be represented as V1, the second interface can be represented as V2, and the third interface can be represented as V3.

[0058] In some embodiments, after obtaining the temperature of the gas cooled by the intercooler in the engine intake system, the control unit controls the water pump opening proportion of the water pump, the first valve opening proportion corresponding to the first interface of the three-way proportional valve, the second valve opening proportion corresponding to the second interface and the third valve opening proportion corresponding to the third interface according to the temperature of the gas.

[0059] In a possible implementation, considering that the water content of the gas in the engine intake system is different under different ambient temperatures, in order to improve the control effectiveness, the control unit can also determine whether to adjust the water pump opening proportion of the water pump and the valve opening proportion of the three-way proportional valve according to the ambient temperature of the environment where the engine is located.

[0060] In a possible implementation, when it is determined that the ambient temperature of the environment where the engine is located meets the ambient temperature threshold, the control unit adjusts the water pump opening proportion of the water pump and the valve opening proportion of the three-way proportional valve according to the temperature of the gas.

[0061] Optionally, the ambient temperature threshold can be 0-35℃. When the ambient temperature is 0-35℃, the air humidity is large, and the water content of the gas in the engine intake system will also increase. At this time, the water pump opening proportion of the water pump and the valve opening proportion of the three-way proportional valve are adjusted according to the temperature of the gas cooled by the intercooler, which can realize effective control of the water amount in the engine.

[0062] Regarding the control of the water pump opening proportion, in a possible implementation, the control unit can determine the temperature difference value according to the temperature of the gas cooled by the intercooler in the engine intake system and the preset temperature, and determine the water pump opening proportion of the water pump according to the temperature difference value belonging to the difference value interval.

[0063] Optionally, the temperature difference is equal to the preset temperature minus the temperature of the gas after intercooling. The greater the temperature difference, the lower the temperature of the gas after intercooling, and the higher the content of condensed water entering the engine. Therefore, the water pump opening ratio can be increased at this time to reduce the liquid flow entering the engine through the connecting passage, so that the liquid in the engine can be quickly evaporated by the heat cycle process in the case of less liquid entering the engine.

[0064] Optionally, in order to simplify the control of the water pump opening ratio, the water pump opening ratio corresponding to each difference interval can also be set. The water pump opening ratio is positively correlated with the temperature difference. The smaller the temperature difference, the higher the temperature of the gas after intercooling in the intercooler, and the lower the content of condensed water entering the engine. Therefore, the water pump opening ratio can be appropriately reduced.

[0065] Optionally, the preset temperature can be 40℃, and the temperature difference is equal to 40℃ minus the temperature of the gas after intercooling. Optionally, when the temperature difference is greater than or equal to 20℃, the water pump opening ratio can be set to 95%; when the temperature difference is between 15℃ and 20℃, the water pump opening ratio can be set to 85%; when the temperature difference is between 10℃ and 15℃, the water pump opening ratio can be set to 65%; when the temperature difference is between 5℃ and 10℃, the water pump opening ratio can be set to 35%; when the temperature difference is between 0 and 5℃, the water pump opening ratio can be set to 25%; when the temperature difference is between -5 and 0℃, the water pump opening ratio can be set to 15%; and when the temperature difference is less than or equal to -5℃, the water pump opening ratio can be set to 10%.

[0066] Regarding the control of the valve opening ratio, in one possible implementation, the control unit can determine the temperature difference according to the temperature of the gas after intercooling in the engine intake system and the preset temperature, and then determine the first valve opening ratio of the first interface, the second valve opening ratio of the second interface, and the third valve opening ratio of the third interface of the three-way proportional valve according to the difference interval to which the temperature difference belongs.

[0067] Optionally, the temperature difference is equal to the preset temperature minus the temperature of the gas after intercooling. The greater the temperature difference, the lower the temperature of the gas after intercooling, and the higher the content of condensed water entering the engine. Therefore, the first valve opening ratio, the second valve opening ratio, and the third valve opening ratio of the three-way proportional valve can be increased at this time to make more cooling liquid enter the conduit where the engine intercooler is located and the conduit where the motor controller is located, so that the liquid flow entering the engine through the connecting passage can be reduced, and thus the liquid in the engine can be quickly evaporated by the heat cycle process in the case of less liquid entering the engine.

[0068] Optionally, in order to simplify the control of the valve opening ratio, the respective valve opening ratio can also be set for different difference intervals. Among them, different difference intervals can correspond to the same first valve opening ratio, different difference intervals can correspond to the same third valve opening ratio, different difference intervals correspond to different second valve opening ratios, and the second valve opening ratio is positively correlated with the temperature difference. The smaller the temperature difference, the higher the temperature of the gas cooled by the intercooler, and the lower the content of the condensed water entering the engine, so the second valve opening ratio can be appropriately reduced; the larger the temperature difference, the lower the temperature of the gas cooled by the intercooler, and the higher the content of the condensed water entering the engine, so the second valve opening ratio can be appropriately increased, so that the liquid flow entering the intercooler in the engine is increased.

[0069] Optionally, the preset temperature can be 40℃, and the temperature difference is 40℃-the temperature of the gas after intercooling. Optionally, the first valve opening ratio in different difference intervals can be set to 100%, and the third valve opening ratio in different difference intervals can be set to 100%.

[0070] Optionally, in the case where the temperature difference is greater than or equal to 27℃, the second valve opening ratio can be set to 100%; in the case where the temperature difference is between 25℃ and 27℃, the second valve opening ratio can be set to 75.5%; in the case where the temperature difference is between 20℃ and 25℃, the second valve opening ratio can be set to 50%; in the case where the temperature difference is between 15℃ and 20℃, the second valve opening ratio can be set to 35%; in the case where the temperature difference is between 10℃ and 15℃, the second valve opening ratio can be set to 25%; in the case where the temperature difference is between 5℃ and 10℃, the second valve opening ratio can be set to 20%; in the case where the temperature difference is between 0 and 5℃, the second valve opening ratio can be set to 15%; in the case where the temperature difference is between -5 and 0℃, the second valve opening ratio can be set to 8%; in the case where the temperature difference is less than or equal to -5℃, the second valve opening ratio can be set to 0%.

[0071] Optionally, in actual application, the water pump opening ratio of the water pump and the valve opening ratio of the three-way proportional valve can be set at the same time, or the water pump opening ratio and the valve opening ratio can be set respectively. Among them, setting the water pump opening ratio and the valve opening ratio at the same time is the best for solving the engine misfire problem.

[0072] In the above embodiment, by calculating the difference between the temperature of the gas after intercooling and the preset temperature, and according to the temperature difference interval, the corresponding water pump opening ratio and valve opening ratio are selected, the real-time control of the water pump and the three-way proportional valve is realized, and in the case that the temperature of the gas after intercooling is low, the liquid flow into the conduit where the intercooling controller is located is increased by increasing the water pump opening ratio and the second valve opening ratio, so that too much cooling liquid does not enter the engine, so that the liquid in the engine can be evaporated faster, effectively avoiding the problem of engine misfire in the case of high air humidity, and improving the performance of the engine.

[0073] Please refer to Figure 4 , which shows the flow chart of setting the water pump opening ratio and the valve opening ratio under different temperature differences provided by an example embodiment of the present application. Among them, the first interface of the three-way proportional valve can be represented as V1, the second interface can be represented as V2, and the third interface can be represented as V3.

[0074] As shown in Figure 4 , in the case that the ambient temperature is 0-35℃, at this time the air humidity is large, therefore in order to avoid causing engine misfire, the control unit determines the temperature difference ΔT(ΔT=40℃-temperature of the gas after intercooling) according to the temperature of the gas after intercooling and the preset temperature 40℃, so as to determine the water pump opening ratio of the water pump, the first valve opening ratio of the first interface V1 of the three-way proportional valve, the second valve opening ratio of the second interface V2, and the third valve opening ratio of the third interface V3 according to the temperature difference interval.

[0075] In the case of △T≥27℃, the water pump opening ratio is 95%, and the valve opening ratios are V1-100%, V2-100%, and V3-100% respectively; in the case of 25℃≤△T<27℃, the water pump opening ratio is 95%, and the valve opening ratios are V1-100%, V2-75.5%, and V3-100% respectively; in the case of 20℃≤△T<25℃, the water pump opening ratio is 95%, and the valve opening ratios are V1-100%, V2-50%, and V3-100% respectively; in the case of 15℃≤△T<20℃, the water pump opening ratio is 85%, and the valve opening ratios are V1-100%, V2-35%, and V3-100% respectively; in the case of 10℃≤△T<15℃, the water pump opening ratio is 65%, and the valve opening ratios are V1-100%, V2-25%, and V3-100% respectively; in the case of 5℃≤△T<10℃, the water pump opening ratio is 35%, and the valve opening ratios are V1-100%, V2-20%, and V3-100% respectively; in the case of 0℃≤△T<5℃, the water pump opening ratio is 25%, and the valve opening ratios are V1-100%, V2-15%, and V3-100% respectively; in the case of -5℃≤△T<0℃, the water pump opening ratio is 15%, and the valve opening ratios are V1-100%, V2-8%, and V3-100% respectively; in the case of △T≤-5℃, the water pump opening ratio is 10%, and the valve opening ratios are V1-100%, V2-0%, and V3-100% respectively.

[0076] In the case of △T≥27℃, the water pump opening ratio is 95%, and the valve opening ratios are V1-100%, V2-100%, and V3-100% respectively, the liquid flow into the conduit where the engine intercooler controller is located is the largest, the liquid flow into the engine is reduced, and the liquid in the engine is most easily evaporated. In the case of △T≤-5℃, the water pump opening ratio is 10%, and the valve opening ratios are V1-100%, V2-0%, and V3-100% respectively, the liquid flow into the conduit where the engine intercooler controller is located is the smallest, the liquid flow into the engine is increased, and the liquid in the engine is most difficult to evaporate.

[0077] Please refer to Figure 5 which shows a flow chart of the control method provided by an example embodiment of the present application. The method is used in a cooling system, which includes an engine, a water pump, a radiator, an engine intercooler controller, a motor controller, a three-way proportional valve, and a control unit.

[0078] Optionally, in the cooling system, the radiator is connected with the water pump, the engine is connected with the radiator through a connecting passage between the radiator and the water pump, the engine intercooler controller is connected with the radiator, and the motor controller is connected with the radiator; the three-way proportional valve is connected with the water pump, the engine intercooler controller, and the motor controller respectively.

[0079] At step 501, based on the temperature of the gas in the engine intake system after being cooled by the intercooler, the control unit controls the water pump opening ratio of the water pump and the valve opening ratio of the three-way proportional valve.

[0080] Optionally, the engine intake system is responsible for introducing air into the engine, mixing with fuel to form combustible mixture, and then burning in the engine to generate power. Optionally, the engine intake system includes an air cleaner, an intake pipe, a supercharger, an intercooler, an intake manifold, an intake temperature sensor, an intake flow sensor, an emission control device, and the like.

[0081] Optionally, the supercharger is used to increase the intake pressure, thereby increasing the intake density and the power output of the engine. Optionally, the intercooler is used to reduce the temperature of the compressed air, thereby improving the intake efficiency and the performance of the engine.

[0082] Optionally, after the gas in the engine intake system is pressurized by the supercharger, the gas pressure increases, the water vapor content increases, and the dew point temperature increases. Then, the gas from the supercharger passes through the intercooler, and the heat in the compressed gas is taken away by the cooling medium (such as coolant or air) in the intercooler to reduce the temperature of the gas. In the case where the intake temperature after the intercooling is less than the dew point temperature, the gas in the intake manifold will condense into liquid water, forming condensed water, which will cause a large amount of condensed water to enter the engine cylinder, resulting in a decrease in combustion efficiency in the cylinder, and the additional water will also dilute the fuel, affecting the quality of the mixture and the combustion process, and even causing the engine to misfire.

[0083] Therefore, in order to effectively control the flow of liquid into the engine, in some embodiments, the cooling system can control the water pump opening ratio of the water pump and the valve opening ratio of the three-way proportional valve in the cooling system according to the temperature of the gas in the engine intake system after being cooled by the intercooler through the control unit.

[0084] Optionally, the control unit can be an ECU or other control unit capable of controlling the water pump and the three-way proportional valve, and the embodiments of the present application do not limit this.

[0085] Optionally, the ECU can be used to control the ignition timing, fuel injection amount, intake and exhaust systems, and the like of the engine in addition to controlling the water pump and the three-way proportional valve.

[0086] Optionally, the water pump is an electronic water pump, and the control unit can control the water pump opening ratio of the water pump by directly adjusting the motor speed of the water pump.

[0087] Optionally, the control unit can control the valve opening ratio of the three-way proportional valve through the control signal. In a possible implementation, the three-way proportional valve is a three-way electromagnetic valve, and the three-way proportional valve adjusts its internal mechanical structure after receiving the control signal sent by the control unit, so as to adjust the valve opening ratio.

[0088] Optionally, the three-way proportional valve is connected with the water pump, the engine intercooler controller and the motor controller respectively. Adjusting the valve opening ratio of the three-way proportional valve is equivalent to adjusting the liquid flow rate between the water pump and the three-way proportional valve, the liquid flow rate between the engine intercooler controller and the three-way proportional valve, and the liquid flow rate between the motor controller and the three-way proportional valve.

[0089] In addition, since the engine is connected with the radiator through the connecting passage between the radiator and the water pump, when the liquid flow rate extracted from the radiator by the water pump is a constant value, the smaller the liquid flow rate between the water pump and the three-way proportional valve, the greater the liquid flow rate entering the engine through the connecting passage, and vice versa.

[0090] In a possible implementation, when it is detected that the temperature of the gas cooled by the intercooler in the engine intake system is too low, that is, there is a large amount of condensed water in the gas entering the engine through the intake manifold from the intercooler, at this time, in order to avoid engine misfire, it is necessary to reduce the liquid flow rate entering the engine, therefore, the control unit can increase the liquid flow rate between the water pump and the three-way proportional valve by controlling the water pump opening ratio of the water pump and the valve opening ratio of the three-way proportional valve, so as to reduce the liquid flow rate entering the engine through the connecting passage.

[0091] Further, when the liquid flow rate entering the engine is small, the liquid in the engine can be evaporated faster during the heat cycle of the engine, so that the probability of engine misfire is reduced.

[0092] In summary, in the embodiments of the present application, by connecting the water pump, the engine intercooler controller and the motor controller through the three-way proportional valve in the cooling system, the water pump opening ratio of the water pump and the valve opening ratio of the three-way proportional valve can be controlled in real time according to the temperature of the gas cooled by the intercooler in the engine intake system, so as to indirectly adjust the cooling liquid flow rate entering the engine in the cooling cycle, and avoid the problem of engine misfire caused by a large amount of cooling liquid entering the engine.

[0093] The scheme shown in the above embodiments of the present application can be applied to a vehicle. Specifically, the present application also provides a vehicle, which comprises the cooling system shown in each of the embodiments.

[0094] Optionally, the carrier can be a hybrid vehicle, a hybrid ship, or a hybrid aircraft, and the embodiments of the present application are not limited in this regard.

[0095] Those skilled in the art can understand that all or part of the steps of the above-mentioned embodiments can be completed by hardware, or a program instructing related hardware, and the program can be stored in a computer readable storage medium, such as a read-only memory, a magnetic disk or an optical disk.

[0096] The above are only optional embodiments of the present application, and are not used to limit the present application, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A cooling system, characterized in that, The cooling system includes an engine, a water pump, a radiator, an engine intercooler controller, a motor controller, a three-way proportional valve, and a control unit; The radiator is connected to the water pump, the engine is connected to the radiator through a connection passage between the radiator and the water pump, the engine intercooler controller is connected to the radiator, and the motor controller is connected to the radiator; the first port of the three-way proportional valve is connected to the water pump, the second port of the three-way proportional valve is connected to the engine intercooler controller, and the third port of the three-way proportional valve is connected to the motor controller. The control unit is used to determine the temperature difference based on the temperature of the gas after being intercooled by the intercooler in the engine intake system and a preset temperature. The control unit is used to determine the water pump opening ratio based on the temperature difference range to which the temperature difference belongs. Different temperature difference ranges correspond to their respective water pump opening ratios, and the water pump opening ratio is positively correlated with the temperature difference. The control unit is used to determine the opening ratio of the first valve at the first interface, the opening ratio of the second valve at the second interface, and the opening ratio of the third valve at the third interface of the three-way proportional valve based on the temperature difference range to which the temperature difference belongs. Different temperature difference ranges correspond to the same opening ratio of the first valve, different temperature difference ranges correspond to the same opening ratio of the third valve, and different temperature difference ranges correspond to different opening ratios of the second valve. The opening ratio of the second valve is positively correlated with the temperature difference.

2. The cooling system according to claim 1, characterized in that, The preset temperature is 40℃; When the temperature difference is greater than or equal to 20℃, the water pump operates at 95%; when the temperature difference is between 15℃ and 20℃, the water pump operates at 85%; when the temperature difference is between 10℃ and 15℃, the water pump operates at 65%; when the temperature difference is between 5℃ and 10℃, the water pump operates at 35%; when the temperature difference is between 0℃ and 5℃, the water pump operates at 25%; when the temperature difference is between -5℃ and 0℃, the water pump operates at 15%; and when the temperature difference is less than or equal to -5℃, the water pump operates at 10%.

3. The cooling system according to claim 1, characterized in that, The preset temperature is 40℃, and the opening ratio of the first valve is 100% in different difference ranges, and the opening ratio of the third valve is 100% in different difference ranges. When the temperature difference is greater than or equal to 27°C, the second valve opens at 100%; when the temperature difference is between 25°C and 27°C, the second valve opens at 75.5%; when the temperature difference is between 20°C and 25°C, the second valve opens at 50%; when the temperature difference is between 15°C and 20°C, the second valve opens at 35%; when the temperature difference is between 10°C and 15°C, the second valve opens at 25%; when the temperature difference is between 5°C and 10°C, the second valve opens at 20%; when the temperature difference is between 0°C and 5°C, the second valve opens at 15%; when the temperature difference is between -5°C and 0°C, the second valve opens at 8%; and when the temperature difference is less than or equal to -5°C, the second valve opens at 0%.

4. A control method, characterized in that, The method is used in a cooling system, which includes an engine, a water pump, a radiator, an engine intercooler controller, a motor controller, a three-way proportional valve, and a control unit. The radiator is connected to the water pump, the engine is connected to the radiator through a connection passage between the radiator and the water pump, the engine intercooler controller is connected to the radiator, and the motor controller is connected to the radiator; the first port of the three-way proportional valve is connected to the water pump, the second port of the three-way proportional valve is connected to the engine intercooler controller, and the third port of the three-way proportional valve is connected to the motor controller. The method includes: The temperature difference is determined by the control unit based on the temperature of the gas after intercooling in the engine intake system and the preset temperature. Based on the temperature difference range, the control unit determines the pump opening ratio of the water pump. Different temperature difference ranges correspond to their respective pump opening ratios, and the pump opening ratio is positively correlated with the temperature difference. Based on the temperature difference range, the control unit determines the opening ratio of the first valve at the first interface, the opening ratio of the second valve at the second interface, and the opening ratio of the third valve at the third interface of the three-way proportional valve. Different temperature difference ranges correspond to the same opening ratio of the first valve, different temperature difference ranges correspond to the same opening ratio of the third valve, and different temperature difference ranges correspond to different opening ratios of the second valve. The opening ratio of the second valve is positively correlated with the temperature difference.

5. A vehicle, characterized in that, The vehicle includes the cooling system as described in any one of claims 1 to 3.

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