Cooling method, device and system of supercharger and extended-range vehicle

Abstract

The invention discloses a supercharger cooling method, device and system and a range-extended vehicle. The method comprises the steps that whether an engine of the range-extended vehicle has an EGR working condition or not is detected; when it is judged that the engine has the EGR working condition, the temperature of an intermediate of the supercharger is obtained; when it is judged that the temperature of the intermediate of the supercharger is larger than or equal to the preset temperature value, the charge state of the range-extended vehicle is obtained; when it is judged that the charge state is larger than or equal to the preset charge state, a first channel of the first electromagnetic three-way valve is controlled to be closed, a second channel and a third channel are controlled to be opened, and meanwhile a first channel of the second electromagnetic three-way valve is controlled to be closed, and a second channel and a third channel are controlled to be opened. The engine cooling circulating water and the EGR secondary cooling circulating water are switched according to the actual working condition of the engine, the supercharger intermediate is cooled, the rapid change of the temperature of the supercharger intermediate after rapid shutdown can be effectively handled, accurate cooling of the supercharger intermediate is achieved, and lubricating oil coking and bearing abrasion are avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of range extending vehicles, in particular to a method, device and system for cooling a supercharger and a range extending vehicle. BACKGROUND

[0002] In a conventional range extending vehicle, the cooling of the supercharger mainly relies on the engine cooling water circuit (the temperature is generally 80-110℃). In a high load power generation working condition, the temperature of the intermediate body of the supercharger may be too high (usually more than 300℃), and poor cooling may easily lead to coking of lubricating oil and bearing wear.

[0003] In addition, the driving of the engine cooling water pump is linked with the engine body, and when the engine stops, the cooling water pump also stops working, and it is unable to effectively respond to the rapid change of the temperature of the intermediate body of the supercharger after rapid stop.

[0004] In addition, due to the existence of the state of charge (SOC) and stop command of the range extending vehicle, the engine has multiple scene start-stop working conditions, and the intermediate body of the supercharger is not pre-judged and cooled in combination with special scenes. SUMMARY

[0005] The present application provides a method, device and system for cooling a supercharger and a range extending vehicle, which switches the engine cooling circulating water and the EGR secondary cooling circulating water according to the actual working condition of the engine, cools the intermediate body of the supercharger, can effectively respond to the rapid change of the temperature of the intermediate body of the supercharger after rapid stop, realizes precise cooling of the intermediate body of the supercharger, and avoids coking of lubricating oil and bearing wear.

[0006] In a first aspect, the present application provides a method for cooling a supercharger, which is suitable for a range extending vehicle comprising a supercharger cooling system, the supercharger cooling system comprising: an engine cooling circulating water circuit, an EGR secondary cooling circulating water circuit, a first electromagnetic three-way valve and a second electromagnetic three-way valve; the engine cooling circulating water circuit comprising a first cooling device, and the EGR secondary cooling circulating water circuit comprising a second cooling device;

[0007] The first channel of the first electromagnetic three-way valve is in communication with the downstream of the first cooling device, the second channel is in communication with the downstream of the second cooling device, and the third channel is in communication with the intermediate body of the supercharger; the first channel of the second electromagnetic three-way valve is in communication with the upstream of the first cooling device, the second channel is in communication with the upstream of the second cooling device, and the third channel is in communication with the intermediate body of the supercharger;

[0008] The method for cooling the supercharger comprises:

[0009] detecting whether the engine of the range extending vehicle has an EGR working condition;

[0010] obtaining a temperature of an intermediate body of the supercharger when it is determined that the engine is in the EGR working condition;

[0011] obtaining a state of charge of the range-extended vehicle when it is determined that the temperature of the intermediate body of the supercharger is greater than or equal to a preset temperature value;

[0012] controlling the first passage of the first electromagnetic three-way valve to be closed, the second passage and the third passage to be opened, and controlling the first passage of the second electromagnetic three-way valve to be closed, the second passage and the third passage to be opened when it is determined that the state of charge is greater than or equal to a preset state of charge.

[0013] Optionally, after obtaining the state of charge of the range-extended vehicle when it is determined that the temperature of the intermediate body of the supercharger is greater than or equal to the preset temperature value, the method further comprises:

[0014] obtaining a shutdown instruction time length of the range-extended vehicle when it is determined that the state of charge is less than the preset state of charge.

[0015] controlling the first passage of the first electromagnetic three-way valve to be closed, the second passage and the third passage to be opened, and controlling the first passage of the second electromagnetic three-way valve to be closed, the second passage and the third passage to be opened when it is determined that the shutdown instruction time length is greater than a preset time length.

[0016] Optionally, after obtaining the shutdown instruction time length of the range-extended vehicle when it is determined that the state of charge is less than the preset state of charge, the method further comprises:

[0017] controlling the first passage and the third passage of the first electromagnetic three-way valve to be opened, the second passage to be closed, and controlling the first passage and the third passage of the second electromagnetic three-way valve to be opened, the second passage to be closed when it is determined that the shutdown instruction time length is less than or equal to the preset time length.

[0018] Optionally, after obtaining the temperature of the intermediate body of the supercharger when it is determined that the engine is in the EGR working condition, the method further comprises:

[0019] obtaining a shutdown instruction time length of the range-extended vehicle when it is determined that the temperature of the intermediate body of the supercharger is less than the preset temperature value.

[0020] controlling the first passage of the first electromagnetic three-way valve to be closed, the second passage and the third passage to be opened, and controlling the first passage of the second electromagnetic three-way valve to be closed, the second passage and the third passage to be opened when it is determined that the shutdown instruction time length is greater than a preset time length, and monitoring the temperature of the intermediate body of the supercharger in real time.

[0021] Optionally, when it is determined that the shutdown instruction duration is greater than the preset duration, the first channel of the first electromagnetic three-way valve is controlled to be closed, the second channel and the third channel are controlled to be opened, the first channel of the second electromagnetic three-way valve is controlled to be closed, the second channel and the third channel are controlled to be opened, and the temperature of the intermediate body of the supercharger is monitored in real time, and then the method further comprises:

[0022] When it is determined that the temperature of the intermediate body of the supercharger is greater than or equal to the preset temperature value, the first channel of the first electromagnetic three-way valve is controlled to be closed, the second channel and the third channel are controlled to be opened, and the first channel of the second electromagnetic three-way valve is controlled to be closed, the second channel and the third channel are controlled to be opened.

[0023] Optionally, when it is determined that the temperature of the intermediate body of the supercharger is less than the preset temperature value, the shutdown instruction duration of the extended-range vehicle is obtained, and then the method further comprises:

[0024] When it is determined that the shutdown instruction duration is less than or equal to the preset duration, the first channel of the first electromagnetic three-way valve is controlled to be closed, the second channel and the third channel are controlled to be opened, the first channel of the second electromagnetic three-way valve is controlled to be closed, and the second channel and the third channel are controlled to be opened.

[0025] Optionally, after detecting whether the engine of the extended-range vehicle exists in an EGR working condition, the method further comprises:

[0026] When it is determined that the engine does not exist in the EGR working condition, the first channel of the first electromagnetic three-way valve is controlled to be closed, the second channel and the third channel are controlled to be opened, the first channel of the second electromagnetic three-way valve is controlled to be closed, and the second channel and the third channel are controlled to be opened.

[0027] In a second aspect, an embodiment of the present application further provides a cooling device of a supercharger, which is used to execute the cooling method of the supercharger in the first aspect, and the cooling device of the supercharger comprises:

[0028] An EGR working condition detection module is configured to detect whether an engine of the extended-range vehicle exists in an EGR working condition.

[0029] A supercharger temperature acquisition module is configured to acquire a temperature of an intermediate body of the supercharger when the EGR working condition detection module determines that the engine exists in the EGR working condition.

[0030] A state of charge acquisition module is configured to acquire a state of charge of the extended-range vehicle when the supercharger temperature acquisition module determines that the temperature of the intermediate body of the supercharger is greater than or equal to a preset temperature value.

[0031] The electromagnetic valve control module is configured to control the first electromagnetic three-way valve to have the first channel closed and the second and third channels opened, and control the second electromagnetic three-way valve to have the first channel closed and the second and third channels opened when the state of charge acquisition module determines that the state of charge is greater than or equal to a preset state of charge.

[0032] In a third aspect, the embodiment of the present application further provides a supercharger cooling system, comprising the cooling device of the supercharger, the engine cooling circulating water circuit, the EGR secondary cooling circulating water circuit, the first electromagnetic three-way valve and the second electromagnetic three-way valve in the second aspect; the engine cooling circulating water circuit comprises a first cooling device, and the EGR secondary cooling circulating water circuit comprises a second cooling device.

[0033] The first cooling device comprises a first water pump, a first water tank and a first radiator, and the second cooling device comprises an EGR secondary cooler, a second water pump, a second water tank and a second radiator.

[0034] The downstream of the first water pump is communicated with the first input end of the first radiator, and the first water tank is communicated with the second input end of the first radiator; the upstream of the second water pump is communicated with the downstream of the EGR secondary cooler, the downstream of the second water pump is communicated with the first input end of the second radiator, and the second water tank is communicated with the second input end of the second radiator.

[0035] The first channel of the first electromagnetic three-way valve is communicated with the downstream of the first radiator, the second channel is communicated with the downstream of the second radiator, and the third channel is communicated with the intermediate body of the supercharger; the first channel of the second electromagnetic three-way valve is communicated with the upstream of the first water pump, the second channel is communicated with the upstream of the EGR secondary cooler, and the third channel is communicated with the intermediate body of the supercharger.

[0036] In a fourth aspect, the embodiment of the present application further provides a range-extended vehicle, comprising the supercharger cooling system in the third aspect.

[0037] The embodiment of the present application provides a supercharger cooling method, device, system and range extending vehicle, the method comprises the following steps: detecting whether the engine of the range extending vehicle exists EGR working condition; when it is determined that the engine exists EGR working condition, obtaining the temperature of the intermediate body of the supercharger; when it is determined that the temperature of the intermediate body of the supercharger is greater than or equal to a preset temperature value, obtaining the state of charge of the range extending vehicle; when it is determined that the state of charge is greater than or equal to a preset state of charge, controlling the first channel of the first electromagnetic three-way valve to be closed, and the second channel and the third channel to be opened, and simultaneously controlling the first channel of the second electromagnetic three-way valve to be closed, and the second channel and the third channel to be opened. According to the actual working condition of the engine, the engine cooling circulating water and the EGR secondary cooling circulating water are switched, the intermediate body of the supercharger is cooled, the rapid change of the temperature of the intermediate body of the supercharger after rapid shutdown can be effectively coped with, the precise cooling of the intermediate body of the supercharger is realized, and coking of lubricating oil and bearing wear are avoided.

[0038] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present application, nor is it used to limit the scope of the present application. Other features of the present application will become apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0039] 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 below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0040] Figure 1 is a structural schematic diagram of a supercharger cooling system provided by the embodiment of the present application;

[0041] Figure 2 is a flowchart of a supercharger cooling method provided by the embodiment of the present application;

[0042] Figure 3 is a flowchart of another supercharger cooling method provided by the embodiment of the present application;

[0043] Figure 4 is a structural schematic diagram of a supercharger cooling device provided by the embodiment of the present application;

[0044] Figure 5 is a structural schematic diagram of another supercharger cooling device provided by the embodiment of the present application. DETAILED DESCRIPTION

[0045] In the following, the technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, so that those skilled in the art can better understand the technical solutions of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work should fall within the protection scope of the present application.

[0046] It should be noted that the terms "first", "second" and the like in the description and claims of the present application and the above drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in other than the order illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device that includes a series of steps or units does not necessarily have to include only those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to the process, method, product or device.

[0047] Figure 1 is a structural schematic diagram of a supercharger cooling system provided by an embodiment of the present application. The embodiment can be applied to a range-extended vehicle including the supercharger cooling system, and reference is made to Figure 1 The supercharger cooling system includes an engine cooling circulating water circuit 1, an EGR secondary cooling circulating water circuit 2, a first electromagnetic three-way valve 3 and a second electromagnetic three-way valve 4. The engine cooling circulating water circuit 1 includes a first cooling device 10, and the EGR secondary cooling circulating water circuit 2 includes a second cooling device 20. The first channel of the first electromagnetic three-way valve 3 is in communication with the downstream of the first cooling device 10, the second channel is in communication with the downstream of the second cooling device 20, and the third channel is in communication with the intermediate body of the supercharger 62. The first channel of the second electromagnetic three-way valve 4 is in communication with the upstream of the first cooling device 10, the second channel is in communication with the upstream of the second cooling device 20, and the third channel is in communication with the intermediate body of the supercharger 62.

[0048] It should be noted that Exhaust Gas Recirculation (EGR) is a kind of emission control technology for internal combustion engine. Its principle is to introduce part of the exhaust gas (usually after cooling) discharged by the engine 6 into the intake manifold A, and then mix with fresh air before entering the cylinder 61 again to participate in combustion. Its main purpose is to reduce the peak temperature of the combustion chamber by introducing inert exhaust gas, thereby effectively inhibiting the generation of nitrogen oxides. The additional benefits include: reducing pumping loss under certain operating conditions, improving fuel economy at part load, and helping to suppress knock for gasoline engines. The feature of low-pressure EGR is that the EGR exhaust gas is taken from the turbine of the supercharger 62. It can be understood that, with reference to Figure 1 , the exhaust gas discharged by the engine 6 in the embodiment of the application is cooled by the EGR primary cooler 71 and the EGR secondary cooler 21, and then introduced into the compressor of the supercharger 62 before the MAF sensor 63, the intercooler 64 and the throttle valve 65, and then enters the cylinder 61 of the engine 6.

[0049] It can be understood that, in the embodiment of the application, the intermediate body of the supercharger 62 has two sets of cooling circulating water circuits, namely the engine cooling circulating water circuit 1 and the EGR secondary cooling circulating water circuit 2, which are divided by the first electromagnetic three-way valve 3 and the second electromagnetic three-way valve 4.

[0050] Among them, the first cooling device 10 of the engine cooling circulating water circuit 1 is linked with the engine 6 (the first cooling device 10 also stops after the engine 6 stops), and the second cooling device 20 of the EGR secondary cooling circulating water circuit 2 can be decoupled with the engine 6 (the second cooling device 20 can also operate after the engine 6 stops). The temperatures of the cooling water in the two sets of cooling circulating water circuits are different, the temperature of the engine cooling circulating water is generally 80-110℃ (which can be called high-temperature water), and the temperature of the EGR secondary cooling circulating water is generally 50-70℃ (which can be called low-temperature water). According to the actual operating conditions of the engine 6, the present embodiment switches the two sets of water circuits by controlling the on-off of the first electromagnetic three-way valve 3 and the second electromagnetic three-way valve 4, thereby realizing precise cooling of the intermediate body of the supercharger 62, as follows:

[0051] Figure 2 is a flowchart of a cooling method of a supercharger provided by the embodiment of the application, with reference to Figure 2 , the cooling method of the supercharger comprises the following steps:

[0052] S210, detecting whether the engine of the range-extended vehicle exists an EGR operating condition.

[0053] It should be noted that, due to the demand for EGR during engine operation, the EGR secondary cooling circulating water is mainly used to cool the EGR gas during engine operation. However, when the engine needs to pursue maximum power output or is in an unstable state, the EGR will be temporarily closed. At this time, the engine does not exist in the EGR working condition. In the short moment when the engine ignition switch is off, but the electronic control system is not completely powered off, the system will actively act the EGR valve once. This is not to treat exhaust gas, but an important "maintenance action", the purpose is to prevent the EGR valve from sticking, at this time the engine also exists in the EGR working condition.

[0054] S220, when it is determined that the engine exists in the EGR working condition, the temperature of the intermediate body of the supercharger is obtained.

[0055] S230, when it is determined that the temperature of the intermediate body of the supercharger is greater than or equal to a preset temperature value, the state of charge of the range-extended vehicle is obtained.

[0056] The preset temperature value can be set according to actual conditions, and can be set as the temperature value when the intermediate body of the supercharger needs to be cooled.

[0057] It should be noted that the state of charge (SOC) is usually expressed in percentage, which describes the ratio of the remaining amount of battery at the current time to the total available amount of battery when the battery is full.

[0058] S240, when it is determined that the state of charge is greater than or equal to a preset state of charge, the first channel of the first electromagnetic three-way valve is controlled to be closed, and the second channel and the third channel are controlled to be opened, and the first channel of the second electromagnetic three-way valve is controlled to be closed, and the second channel and the third channel are controlled to be opened.

[0059] The preset state of charge can be set according to actual conditions, and can be set as the state of charge when the engine will not generate electricity again, and the state of charge of the range-extended vehicle when it enters long parking.

[0060] It can be understood that when it is determined that the engine exists in the EGR working condition, and the temperature of the intermediate body of the supercharger is greater than or equal to the preset temperature value, it indicates that the intermediate body of the supercharger is in a high temperature state, and at this time the state of charge of the range-extended vehicle is greater than or equal to the preset state of charge, which indicates that the engine will not generate electricity again, and the range-extended vehicle enters long parking. By controlling the first channel of the first electromagnetic three-way valve to be closed, and the second channel and the third channel to be opened, and controlling the first channel of the second electromagnetic three-way valve to be closed, and the second channel and the third channel to be opened, the EGR secondary cooling circulating water can be switched to cool the intermediate body of the supercharger, thereby obtaining better cooling effect.

[0061] The embodiment of the application switches the engine cooling circulating water and the EGR secondary cooling circulating water according to the actual working condition of the engine, and can effectively cope with the rapid change of the temperature of the intermediate body of the supercharger after rapid shutdown. Specifically, when the engine is in the EGR working condition, the temperature of the intermediate body of the supercharger is greater than or equal to a preset temperature value, and the state of charge of the extended-range vehicle is greater than or equal to a preset state of charge, the EGR secondary cooling circulating water is switched to cool the intermediate body of the supercharger, and better cooling effect can be obtained, and coking of lubricating oil and bearing wear can be avoided.

[0062] Figure 3 is a flow chart of another cooling method of a supercharger provided by the embodiment of the application, referring to Figure 3 The method comprises the following steps:

[0063] S310, detecting whether the engine of the extended-range vehicle is in the EGR working condition.

[0064] S320, when it is determined that the engine is in the EGR working condition, obtaining the temperature of the intermediate body of the supercharger.

[0065] S330, when it is determined that the temperature of the intermediate body of the supercharger is greater than or equal to a preset temperature value, obtaining the state of charge of the extended-range vehicle.

[0066] S340, when it is determined that the state of charge is greater than or equal to a preset state of charge, controlling the first channel of the first electromagnetic three-way valve to be closed, and the second channel and the third channel to be opened, and simultaneously controlling the first channel of the second electromagnetic three-way valve to be closed, and the second channel and the third channel to be opened.

[0067] Optionally, on the basis of the above embodiment, after step S330, the method further comprises steps S341-S351.

[0068] S341, when it is determined that the state of charge is less than the preset state of charge, obtaining the shutdown instruction time length of the extended-range vehicle.

[0069] It can be understood that when the state of charge of the extended-range vehicle is less than the preset state of charge, the embodiment of the application further needs to judge whether the extended-range vehicle is in the long parking state or the short parking state according to the shutdown instruction time length of the engine of the extended-range vehicle. When the shutdown instruction time length of the extended-range vehicle is less than or equal to a preset time length, it can be determined that the extended-range vehicle is in the short parking state. During the short parking, only the cooling of the intermediate body of the supercharger in the engine circulating water circuit, the temperature of the intermediate body of the supercharger will not exceed the safe temperature too much in a short time, and it is not necessary to switch to the EGR secondary cooling circulating water to cool the intermediate body. When the shutdown instruction time length of the extended-range vehicle is greater than a preset time length, it can be determined that the extended-range vehicle is in the long parking state, and the EGR secondary cooling circulating water is switched to cool the intermediate body, and better cooling effect can be achieved.

[0070] S351、when it is determined that the shutdown instruction duration is greater than the preset duration, the first channel of the first electromagnetic three-way valve is controlled to be closed, the second channel and the third channel are controlled to be opened, and the first channel of the second electromagnetic three-way valve is controlled to be closed, the second channel and the third channel are controlled to be opened.

[0071] The preset duration can be set according to actual conditions. When the shutdown instruction duration of the extended-range vehicle is less than or equal to the preset duration, the extended-range vehicle is in a short parking state; and when the shutdown instruction duration of the extended-range vehicle is greater than the preset duration, the extended-range vehicle is in a long parking state.

[0072] It can be understood that when it is determined that the engine exists the EGR working condition, the temperature of the intermediate body of the supercharger is greater than or equal to the preset temperature value, the state of charge of the extended-range vehicle is less than or equal to the preset state of charge, and the shutdown instruction duration is greater than the preset duration, it indicates that the extended-range vehicle is in the long parking state, the first channel of the first electromagnetic three-way valve is controlled to be closed, the second channel and the third channel are controlled to be opened, the first channel of the second electromagnetic three-way valve is controlled to be closed, and the second channel and the third channel are controlled to be opened, so that the EGR secondary cooling circulating water can be switched to cool the intermediate body, and a better cooling effect can be achieved.

[0073] Optionally, on the basis of the above embodiment, after the step S341, the method further comprises a step S352.

[0074] S352、when it is determined that the shutdown instruction duration is less than or equal to the preset duration, the first channel and the third channel of the first electromagnetic three-way valve are controlled to be opened, and the second channel is controlled to be closed, and the first channel and the third channel of the second electromagnetic three-way valve are controlled to be opened, and the second channel is controlled to be closed.

[0075] It can be understood that when it is determined that the engine exists the EGR working condition, the temperature of the intermediate body of the supercharger is greater than or equal to the preset temperature value, the state of charge of the extended-range vehicle is less than the preset state of charge, and the shutdown instruction duration is less than or equal to the preset duration, it indicates that the extended-range vehicle is in the short parking state, the first channel and the third channel of the first electromagnetic three-way valve are controlled to be opened, and the second channel is controlled to be closed, the first channel and the third channel of the second electromagnetic three-way valve are controlled to be opened, and the second channel is controlled to be closed, so that only the engine circulating water can be used to cool the intermediate body of the supercharger, and the temperature of the intermediate body of the supercharger will not exceed the safe temperature too much in a short time, and there is no need to switch the low-temperature water.

[0076] Optionally, on the basis of the above embodiment, after the step S320, the method further comprises steps S331 to S342.

[0077] S331、when it is determined that the temperature of the intermediate body of the supercharger is less than the preset temperature value, the shutdown instruction duration of the extended-range vehicle is obtained.

[0078] S342, when determining that the shutdown instruction duration is greater than the preset duration, controlling the first channel of the first electromagnetic three-way valve to be closed, the second channel and the third channel to be opened, simultaneously controlling the first channel of the second electromagnetic three-way valve to be closed, the second channel and the third channel to be opened, and monitoring the temperature of the intermediate body of the supercharger in real time.

[0079] It can be understood that when it is determined that the temperature of the intermediate body of the supercharger is less than the preset temperature value, it indicates that the intermediate body of the supercharger is in a low-temperature state, and the temperature is within a safe temperature. When the shutdown instruction duration is greater than the preset duration, it indicates that the range-extending vehicle is in a long parking state at this time, the first channel and the third channel of the first electromagnetic three-way valve are controlled to be opened, and the second channel is controlled to be closed, simultaneously, the first channel and the third channel of the second electromagnetic three-way valve are controlled to be opened, and the second channel is controlled to be closed. At this time, the intermediate body of the supercharger is cooled by circulating water of the engine, but the temperature of the intermediate body of the supercharger needs to be monitored in real time.

[0080] Optionally, on the basis of the above embodiment, after step S342, there further comprises step S353.

[0081] S353, when it is determined that the temperature of the intermediate body of the supercharger is greater than or equal to the preset temperature value, controlling the first channel of the first electromagnetic three-way valve to be closed, the second channel and the third channel to be opened, simultaneously controlling the first channel of the second electromagnetic three-way valve to be closed, the second channel and the third channel to be opened.

[0082] It can be understood that when it is determined that the engine exists EGR working condition, the temperature of the intermediate body of the supercharger is less than the preset temperature value, and the shutdown instruction duration is greater than the preset duration, the temperature of the intermediate body of the supercharger will be monitored in real time. When it is determined that the temperature of the intermediate body of the supercharger is greater than or equal to the preset temperature value, the first channel of the first electromagnetic three-way valve is controlled to be closed, the second channel and the third channel are controlled to be opened, simultaneously, the first channel of the second electromagnetic three-way valve is controlled to be closed, the second channel and the third channel are controlled to be opened, so that the intermediate body can be cooled by EGR secondary cooling circulating water in time, and the temperature of the intermediate body is ensured to be within a safe range.

[0083] Optionally, on the basis of the above embodiment, after step S331, there further comprises:

[0084] S343, when determining that the shutdown instruction duration is less than or equal to the preset duration, controlling the first channel of the first electromagnetic three-way valve to be closed, the second channel and the third channel to be opened, simultaneously controlling the first channel of the second electromagnetic three-way valve to be closed, the second channel and the third channel to be opened.

[0085] It can be understood that when it is determined that the engine is in the EGR working condition, the temperature of the intermediate body of the supercharger is less than the preset temperature value, and the shutdown instruction duration is less than or equal to the preset duration, the first channel of the first electromagnetic three-way valve is controlled to be closed, the second channel and the third channel are controlled to be opened, the first channel of the second electromagnetic three-way valve is controlled to be closed, the second channel and the third channel are controlled to be opened, the first channel and the third channel of the first electromagnetic three-way valve are controlled to be opened, and the second channel is controlled to be closed, the first channel and the third channel of the second electromagnetic three-way valve are controlled to be opened, and the second channel is controlled to be closed, at this time, only the engine circulating water is used to cool the intermediate body of the supercharger, and the temperature of the intermediate body of the supercharger will not exceed the safe temperature too much in a short time, and the low-temperature water does not need to be switched.

[0086] Optionally, on the basis of the above-mentioned embodiment, after step S310, the method further comprises:

[0087] S321, when it is determined that the engine is not in the EGR working condition, the first channel of the first electromagnetic three-way valve is controlled to be closed, and the second channel and the third channel are controlled to be opened, and the first channel of the second electromagnetic three-way valve is controlled to be closed, and the second channel and the third channel are controlled to be opened.

[0088] It can be understood that when it is determined that the engine is not in the EGR working condition, the first channel of the first electromagnetic three-way valve is controlled to be closed, and the second channel and the third channel are controlled to be opened, and the first channel of the second electromagnetic three-way valve is controlled to be closed, and the second channel and the third channel are controlled to be opened, and the EGR secondary cooling circulating water is used to cool the intermediate body, and a better cooling effect can be achieved.

[0089] In summary, the embodiment has the following advantages: 1. simple structure modification and reasonable resource utilization: the original low-pressure EGR secondary cooling water circulation is introduced into the intermediate body cooling circuit of the supercharger, the first electromagnetic three-way valve and the second electromagnetic three-way valve are connected with / segmented from the original intermediate body cooling water circuit, and resources are reasonably utilized. 2. Precise control of intermediate body temperature, prolonging the service life of the supercharger and ensuring system reliability: special scenarios such as no EGR working condition, long-time shutdown and temperature anomaly are fully covered, the cooling circuit is dynamically adjusted, precise cooling of the intermediate body of the supercharger can be realized, lubricating oil coking and bearing wear are avoided, and stability and reliability are ensured.

[0090] Figure 4 is a structural schematic diagram of a cooling device of a supercharger provided by the embodiment, and the cooling device of the supercharger is used to execute the cooling method of the supercharger of the above-mentioned embodiment, and reference is made to Figure 4The cooling device for the turbocharger includes: an EGR condition detection module 410 for detecting whether the engine of the range-extended vehicle is in EGR condition; a turbocharger temperature acquisition module 420 for acquiring the temperature of the turbocharger intermediate body when the EGR condition detection module determines that the engine is in EGR condition; a state of charge acquisition module 430 for acquiring the state of charge of the range-extended vehicle when the turbocharger temperature acquisition module determines that the temperature of the turbocharger intermediate body is greater than or equal to a preset temperature value; and a solenoid valve control module 440 for controlling the first channel of the first solenoid three-way valve to close and the second and third channels to open when the state of charge acquisition module determines that the state of charge is greater than or equal to a preset state of charge, and simultaneously controlling the first channel of the second solenoid three-way valve to close and the second and third channels to open.

[0091] Figure 5 This is a schematic diagram of a cooling device for a turbocharger provided in an embodiment of the present invention, for reference. Figure 5 The device also includes a shutdown command duration acquisition module 510, which is used to acquire the shutdown command duration of the range-extended vehicle when the state of charge is determined to be less than the preset state of charge.

[0092] The turbocharger cooling device provided in this embodiment of the invention is used to perform the turbocharger cooling method provided in any of the above embodiments, and therefore has the same beneficial effects. For the contents not described in detail in the embodiments of the invention, please refer to the turbocharger cooling method provided in the above embodiments.

[0093] This invention also provides a turbocharger cooling system, which will be discussed further below. Figure 1 The system includes the cooling device provided in the above embodiments. Figure 1 (Not shown in the image) Engine cooling circulating water circuit 1, EGR secondary cooling circulating water circuit 2, first solenoid three-way valve 3 and second solenoid three-way valve 4; Engine cooling circulating water circuit 1 includes a first cooling device 10, EGR secondary cooling circulating water circuit 2 includes a second cooling device 20; First cooling device 10 includes a first water pump 11, a first water tank 12 and a first radiator 13, Second cooling device 20 includes an EGR secondary cooler 21, a second water pump 22, a second water tank 23 and a second radiator 24.

[0094] It should be noted that the first water pump 11 is linked to the engine 6 (the first water pump 11 also stops when the engine 6 stops), and the second water pump 22 is an electronic water pump, which can be decoupled from the engine 6 (the second water pump 22 can also operate when the engine 6 stops).

[0095] Continue to refer to Figure 1The downstream of the first water pump 11 is communicated with the first input end of the first radiator 13, and the first water tank 12 is communicated with the second input end of the first radiator 13; the upstream of the second water pump 22 is communicated with the downstream of the EGR secondary cooler 21, the downstream of the second water pump 22 is communicated with the first input end of the second radiator 24, and the second water tank 23 is communicated with the second input end of the second radiator 24; the first channel of the first electromagnetic three-way valve 3 is communicated with the downstream of the first radiator 13, the second channel is communicated with the downstream of the second radiator 24, and the third channel is communicated with the intermediate body of the supercharger 62; the first channel of the second electromagnetic three-way valve 4 is communicated with the upstream of the first water pump 11, the second channel is communicated with the upstream of the EGR secondary cooler 21, and the third channel is communicated with the intermediate body of the supercharger 62.

[0096] The embodiment of the present application further provides a range extending vehicle comprising the supercharger cooling system provided by the above embodiment.

[0097] It should be understood that the various forms of flow shown above can be used to reorder, add or delete steps. For example, the steps described in the present application can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solutions of the present application can be achieved, which are not limited herein.

[0098] The above specific embodiments do not constitute a limitation on the protection scope of the present application. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent replacement and improvement within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A cooling method for a turbocharger, characterized in that, This invention is applicable to range-extended vehicles that include a turbocharger cooling system, wherein the turbocharger cooling system comprises: an engine cooling water circulation circuit, an EGR secondary cooling water circulation circuit, a first solenoid three-way valve, and a second solenoid three-way valve; the engine cooling water circulation circuit includes a first cooling device, and the EGR secondary cooling water circulation circuit includes a second cooling device. The first channel of the first electromagnetic three-way valve is connected to the downstream of the first cooling device, the second channel is connected to the downstream of the second cooling device, and the third channel is connected to the intermediate body of the turbocharger; the first channel of the second electromagnetic three-way valve is connected to the upstream of the first cooling device, the second channel is connected to the upstream of the second cooling device, and the third channel is connected to the intermediate body of the turbocharger. The cooling method for the turbocharger includes: Check whether the engine of the range-extended vehicle is in EGR mode; When it is determined that the engine is in EGR mode, the temperature of the intermediate body of the turbocharger is obtained; When it is determined that the temperature of the intermediate body of the turbocharger is greater than or equal to a preset temperature value, the state of charge of the range-extended vehicle is obtained. When the state of charge is determined to be greater than or equal to the preset state of charge, the first channel of the first electromagnetic three-way valve is closed and the second and third channels are opened. At the same time, the first channel of the second electromagnetic three-way valve is closed and the second and third channels are opened.

2. The cooling method for the turbocharger according to claim 1, characterized in that, When it is determined that the temperature of the intermediate body of the turbocharger is greater than or equal to a preset temperature value, after obtaining the state of charge of the range-extended vehicle, the process further includes: When it is determined that the state of charge is less than the preset state of charge, the duration of the shutdown command for the range-extended vehicle is obtained; When the duration of the shutdown command is determined to be longer than a preset duration, the first channel of the first electromagnetic three-way valve is closed and the second and third channels are opened. At the same time, the first channel of the second electromagnetic three-way valve is closed and the second and third channels are opened.

3. The cooling method for the turbocharger according to claim 2, characterized in that, When the state of charge is determined to be less than a preset state of charge, after obtaining the shutdown command duration of the range extender vehicle, the process further includes: When it is determined that the duration of the shutdown command is less than or equal to the preset duration, the first and third channels of the first electromagnetic three-way valve are opened and the second channel is closed. At the same time, the first and third channels of the second electromagnetic three-way valve are opened and the second channel is closed.

4. The cooling method for the turbocharger according to claim 1, characterized in that, When it is determined that the engine is in EGR mode, after obtaining the temperature of the intermediate body of the turbocharger, the process further includes: When it is determined that the temperature of the intermediate body of the turbocharger is lower than the preset temperature value, the shutdown command duration of the range-extended vehicle is obtained; When the duration of the shutdown command is determined to be longer than the preset duration, the first channel of the first electromagnetic three-way valve is closed and the second and third channels are opened. At the same time, the first channel of the second electromagnetic three-way valve is closed and the second and third channels are opened, and the temperature of the intermediate body of the booster is monitored in real time.

5. The cooling method for the turbocharger according to claim 4, characterized in that, When the duration of the shutdown command is determined to be longer than a preset duration, the system controls the first channel of the first solenoid three-way valve to close and the second and third channels to open. Simultaneously, it controls the first channel of the second solenoid three-way valve to close, the second channel to open, and the third channel to open. After real-time monitoring of the temperature of the intermediate body of the booster, the system further includes: When the temperature of the intermediate body of the booster is determined to be greater than or equal to a preset temperature value, the first channel of the first electromagnetic three-way valve is controlled to close, and the second and third channels are controlled to open. At the same time, the first channel of the second electromagnetic three-way valve is controlled to close, and the second and third channels are controlled to open.

6. The cooling method for the turbocharger according to claim 4, characterized in that, When it is determined that the temperature of the intermediate body of the turbocharger is lower than the preset temperature value, after obtaining the shutdown command duration of the range extender vehicle, the process further includes: When it is determined that the duration of the shutdown command is less than or equal to the preset duration, the first channel of the first electromagnetic three-way valve is closed and the second and third channels are opened. At the same time, the first channel of the second electromagnetic three-way valve is closed and the second and third channels are opened.

7. The cooling method for the turbocharger according to claim 1, characterized in that, After detecting whether the engine of the range-extended vehicle is in EGR mode, the process also includes: When it is determined that the engine does not have EGR operating conditions, the first channel of the first solenoid three-way valve is closed and the second and third channels are opened, and the first channel of the second solenoid three-way valve is closed and the second and third channels are opened.

8. A cooling device for a turbocharger, characterized in that, For performing the cooling method of the turbocharger according to any one of claims 1 to 7, the cooling device of the turbocharger comprises: The EGR condition detection module is used to detect whether the engine of the range-extended vehicle is in EGR condition. The turbocharger temperature acquisition module is used to acquire the temperature of the intermediate body of the turbocharger when the EGR condition detection module determines that the engine is in EGR condition; A state of charge acquisition module is used to acquire the state of charge of the range-extended vehicle when the turbocharger temperature acquisition module determines that the temperature of the intermediate body of the turbocharger is greater than or equal to a preset temperature value. The solenoid valve control module is used to control the first channel of the first solenoid three-way valve to close and the second and third channels to open when the state of charge acquisition module determines that the state of charge is greater than or equal to a preset state of charge, and at the same time control the first channel of the second solenoid three-way valve to close and the second and third channels to open.

9. A turbocharger cooling system, characterized in that, It includes the cooling device for the turbocharger as described in claim 8, an engine cooling water circulation circuit, an EGR secondary cooling water circulation circuit, a first electromagnetic three-way valve, and a second electromagnetic three-way valve; the engine cooling water circulation circuit includes a first cooling device, and the EGR secondary cooling water circulation circuit includes a second cooling device. The first cooling device includes a first water pump, a first water tank, and a first radiator; the second cooling device includes an EGR secondary cooler, a second water pump, a second water tank, and a second radiator. The downstream end of the first water pump is connected to the first input terminal of the first radiator, and the first water tank is connected to the second input terminal of the first radiator; the upstream end of the second water pump is connected to the downstream end of the EGR secondary cooler, the downstream end of the second water pump is connected to the first input terminal of the second radiator, and the second water tank is connected to the second input terminal of the second radiator. The first channel of the first electromagnetic three-way valve is connected to the downstream of the first radiator, the second channel is connected to the downstream of the second radiator, and the third channel is connected to the intermediate body of the booster; the first channel of the second electromagnetic three-way valve is connected to the upstream of the first water pump, the second channel is connected to the upstream of the EGR secondary cooler, and the third channel is connected to the intermediate body of the booster.

10. A range-extended vehicle, characterized in that, Includes the turbocharger cooling system as described in claim 9.

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