A method, device, system and extended-range vehicle for cooling a supercharger

Abstract

The application discloses 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 is in EGR working condition; when it is determined that the engine is in 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, 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. 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 the coking of lubricating oil and the wear of bearings are avoided.

Description

Technical Field

[0001] This invention relates to the field of range-extended vehicle technology, and in particular to a method, apparatus, system for cooling a turbocharger and a range-extended vehicle. Background Technology

[0002] In traditional range-extended vehicles, turbocharger cooling mainly relies on the engine cooling water circuit (temperature typically 80~110℃). Under high-load power generation conditions, the temperature of the turbocharger intermediate body may become excessively high (usually exceeding 300℃), and poor cooling can easily lead to lubricating oil coking and bearing wear.

[0003] In addition, the engine coolant pump is driven in conjunction with the engine body. When the engine stops, the coolant pump also stops operating, which cannot effectively cope with the rapid temperature change of the turbocharger intermediate body after a rapid shutdown.

[0004] In addition, due to factors such as State of Charge (SOC) and shutdown commands, range-extended vehicles experience multiple start-stop conditions for the engine, and the turbocharger intermediate unit is not pre-cooled according to specific scenarios. Summary of the Invention

[0005] This invention provides a method, device, system, and range-extending vehicle for cooling a turbocharger. It switches between engine cooling water and EGR secondary cooling water according to the actual operating conditions of the engine to cool the turbocharger intermediate body. This can effectively cope with the rapid temperature change of the turbocharger intermediate body after a quick engine shutdown, achieve precise cooling of the turbocharger intermediate body, and avoid lubricating oil coking and bearing wear.

[0006] In a first aspect, embodiments of the present invention provide a method for cooling a turbocharger, applicable to range-extended vehicles including a turbocharger cooling system, wherein the turbocharger cooling system includes: 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.

[0007] 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.

[0008] The cooling method for the turbocharger includes:

[0009] Check whether the engine of the range-extended vehicle is in EGR mode;

[0010] When it is determined that the engine is in EGR mode, the temperature of the intermediate body of the turbocharger is obtained;

[0011] 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.

[0012] 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.

[0013] Optionally, after determining that the temperature of the intermediate body of the turbocharger is greater than or equal to a preset temperature value, and obtaining the state of charge of the range-extended vehicle, the method further includes:

[0014] 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;

[0015] 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.

[0016] Optionally, 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-extended vehicle, the method further includes:

[0017] 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.

[0018] Optionally, when it is determined that the engine is in EGR mode, after obtaining the temperature of the intermediate body of the turbocharger, the method further includes:

[0019] 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;

[0020] 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.

[0021] Optionally, when the duration of the shutdown command is determined to be longer than a preset duration, the system further includes controlling the first channel of the first solenoid three-way valve to close and the second and third channels to open, simultaneously controlling the first channel of the second solenoid three-way valve to close and the second and third channels to open, and monitoring the temperature of the intermediate body of the booster in real time.

[0022] 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.

[0023] Optionally, 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 method further includes:

[0024] 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, and the first channel of the second electromagnetic three-way valve is closed and the second and third channels are opened.

[0025] Optionally, after detecting whether the engine of the range-extended vehicle is in EGR mode, the method further includes:

[0026] 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.

[0027] In a second aspect, embodiments of the present invention also provide a cooling device for a turbocharger, used to perform the turbocharger cooling method described in the first aspect, the cooling device for the turbocharger comprising:

[0028] The EGR condition detection module is used to detect whether the engine of the range-extended vehicle is in EGR condition.

[0029] 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;

[0030] 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.

[0031] 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.

[0032] Thirdly, embodiments of the present invention also provide a turbocharger cooling system, including the turbocharger cooling device described in the second aspect, 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] Fourthly, embodiments of the present invention also provide a range-extended vehicle, including the turbocharger cooling system described in the third aspect.

[0037] This invention provides a method, apparatus, system, and range-extended vehicle for cooling a turbocharger. The method includes: detecting whether the engine of the range-extended vehicle is in EGR mode; when it is determined that the engine is in EGR mode, acquiring the temperature of the turbocharger intermediate body; when it is determined that the temperature of the turbocharger intermediate body is greater than or equal to a preset temperature value, acquiring the state of charge (SOC) of the range-extended vehicle; when it is determined that the SOC is greater than or equal to the preset SOC, controlling the first channel of a first solenoid three-way valve to close and the second and third channels to open, and simultaneously controlling the first channel of a second solenoid three-way valve to close and the second and third channels to open. This invention switches between engine cooling water and EGR secondary cooling water according to the actual engine operating conditions to cool the turbocharger intermediate body. This effectively addresses the rapid temperature changes of the turbocharger intermediate body after a rapid engine shutdown, achieving precise cooling of the turbocharger intermediate body and preventing lubricating oil coking and bearing wear.

[0038] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1 This is a schematic diagram of a turbocharger cooling system provided in an embodiment of the present invention;

[0041] Figure 2 This is a flowchart of a cooling method for a turbocharger provided in an embodiment of the present invention;

[0042] Figure 3 This is a flowchart of another turbocharger cooling method provided in an embodiment of the present invention;

[0043] Figure 4 This is a schematic diagram of the structure of a cooling device for a turbocharger provided in an embodiment of the present invention;

[0044] Figure 5 This is a schematic diagram of the structure of another turbocharger cooling device provided in an embodiment of the present invention. Detailed Implementation

[0045] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0046] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0047] Figure 1 This is a schematic diagram of a turbocharger cooling system provided in an embodiment of the present invention. This embodiment is applicable to range-extended vehicles that include a turbocharger cooling system. (Refer to...) Figure 1 The turbocharger cooling system includes: an engine cooling water circuit 1, an EGR secondary cooling water circuit 2, a first solenoid three-way valve 3, and a second solenoid three-way valve 4; the engine cooling water circuit 1 includes a first cooling device 10, and the EGR secondary cooling water circuit 2 includes a second cooling device 20; the first channel of the first solenoid three-way valve 3 is connected to the downstream of the first cooling device 10, the second channel is connected to the downstream of the second cooling device 20, and the third channel is connected to the intermediate body of the turbocharger 62; the first channel of the second solenoid three-way valve 4 is connected to the upstream of the first cooling device 10, the second channel is connected to the upstream of the second cooling device 20, and the third channel is connected to the intermediate body of the turbocharger 62.

[0048] It should be noted that Exhaust Gas Recirculation (EGR) is an internal combustion engine emission control technology. Its principle is to reintroduce a portion of the exhaust gas from engine 6 (usually after cooling) into the intake manifold A, mix it with fresh air, and then re-enter cylinder 61 for combustion. Its main purpose is to reduce the peak temperature of the combustion chamber by introducing inert exhaust gas, thereby effectively suppressing the formation of nitrogen oxides. Additional benefits include: reduced pumping losses under certain operating conditions, improved fuel economy under partial load, and, for gasoline engines, help suppress knocking. A characteristic of low-pressure EGR is that the EGR exhaust gas intake point is located after the turbocharger 62. This can be understood as, with reference to... Figure 1 In this embodiment of the invention, the exhaust gas discharged from the engine 6 is cooled by the EGR primary cooler 71 and the EGR secondary cooler 21, and then passes through the EGR valve 72 before being led back to the compressor of the turbocharger 62. After passing through the MAF sensor 63, the intercooler 64 and the throttle valve 65, it enters the cylinder 61 of the engine 6.

[0049] It is understood that in this embodiment of the invention, the intermediate body of the turbocharger 62 has two sets of cooling water circulation circuits, namely the engine cooling water circulation circuit 1 and the EGR secondary cooling water circulation circuit 2. The two sets of cooling water circulation circuits are separated by the first electromagnetic three-way valve 3 and the second electromagnetic three-way valve 4.

[0050] In this embodiment, the first cooling device 10 of the engine cooling water circulation circuit 1 is linked to the engine 6 (the first cooling device 10 also stops when the engine 6 stops), while the second cooling device 20 of the EGR secondary cooling water circulation circuit 2 can be decoupled from the engine 6 (the second cooling device 20 can still operate even when the engine 6 stops). The cooling water temperatures in the two cooling water circulation circuits are different. The temperature of the engine cooling water circulation is generally 80~110℃ (which can be called high-temperature water), and the temperature of the EGR secondary cooling water circulation is generally 50~70℃ (which can be called low-temperature water). According to the actual operating conditions of the engine 6, this embodiment of the invention controls the opening and closing of the first electromagnetic three-way valve 3 and the second electromagnetic three-way valve 4 to achieve the switching of the two water circuits, thereby achieving precise cooling of the intermediate body of the turbocharger 62, as detailed below:

[0051] Figure 2 This is a flowchart of a turbocharger cooling method provided in an embodiment of the present invention, see reference. Figure 2 The cooling method for the turbocharger includes the following steps:

[0052] S210. Check if the engine of the range-extended vehicle is in EGR mode.

[0053] It's important to note that because the engine requires EGR during operation, the secondary EGR coolant is primarily used to cool the EGR gases. However, when the engine needs to maximize power output or is in an unstable operating state, EGR will be temporarily shut off, and the engine will not be in EGR mode at this time. During the brief moment when the engine ignition switch is off but the electronic control system is not completely de-energized, the system will automatically activate the EGR valve once. This is not for treating exhaust gases, but rather an important "maintenance" procedure to prevent the EGR valve from sticking; the engine will still be in EGR mode during this time.

[0054] S220. When it is determined that the engine is in EGR condition, the temperature of the intermediate body of the turbocharger is obtained.

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

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

[0057] It should be noted that the State of Charge (SOC) is usually expressed as a percentage, which describes the ratio of the battery's remaining charge at the current moment to the total usable charge when the battery is fully charged.

[0058] S240. 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 solenoid three-way valve is closed and the second and third channels are opened. At the same time, the first channel of the second solenoid three-way valve is closed and the second and third channels are opened.

[0059] The preset state of charge can be set according to the actual situation. It can be set so that when the state of charge is greater than or equal to the preset state of charge, the engine will no longer generate electricity, and the range-extended vehicle will enter the state of charge when it is parked for a long time.

[0060] Understandably, when the engine is determined to be in EGR mode, the temperature of the turbocharger intermediate body is greater than or equal to the preset temperature value, indicating that the turbocharger intermediate body is in a high-temperature state. At this time, the state of charge of the range extender vehicle is greater than or equal to the preset state of charge, indicating that the engine will no longer generate electricity. The range extender vehicle enters a long-term parking state. By controlling the first channel of the first solenoid three-way valve to close and the second and third channels to open, and simultaneously controlling the first channel of the second solenoid three-way valve to close and the second and third channels to open, the EGR secondary cooling water can be switched to cool the turbocharger intermediate body, thereby obtaining a better cooling effect.

[0061] This invention switches between engine cooling water and EGR secondary cooling water based on the engine's actual operating conditions to cool the turbocharger intermediate body, effectively addressing rapid temperature changes in the turbocharger intermediate body after a quick engine shutdown. Specifically, when the engine is operating under EGR conditions, and the temperature of the turbocharger intermediate body is greater than or equal to a preset temperature value, and the state of charge of the range-extended vehicle is greater than or equal to a preset state of charge, switching to EGR secondary cooling water to cool the turbocharger intermediate body achieves better cooling results and prevents lubricating oil coking and bearing wear.

[0062] Figure 3 This is a flowchart of another turbocharger cooling method provided in an embodiment of the present invention, see reference. Figure 3 The method includes the following steps:

[0063] S310. Check if the engine of the range-extended vehicle is in EGR mode.

[0064] S320: When it is determined that the engine is in EGR condition, obtain the temperature of the intermediate body of the turbocharger.

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

[0066] S340. 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 solenoid three-way valve is closed and the second and third channels are opened. At the same time, the first channel of the second solenoid three-way valve is closed and the second and third channels are opened.

[0067] Optionally, based on the above embodiments, after step S330, steps S341 to S351 are further included.

[0068] S341. When the state of charge is determined to be less than the preset state of charge, obtain the duration of the shutdown command for the range-extended vehicle.

[0069] Understandably, when the state of charge (SBC) of the range-extended vehicle is less than a preset SBC, this invention needs to further determine whether the range-extended vehicle is in a long or short stop state based on the duration of the engine's shutdown command. When the shutdown command duration is less than or equal to a preset duration, the range-extended vehicle is determined to be in a short stop state. During a short stop, the temperature of the turbocharger intermediate unit, cooled solely by the engine's cooling water circuit, will not exceed a safe temperature significantly in a short time, eliminating the need to switch to EGR secondary cooling water cooling. When the shutdown command duration is greater than a preset duration, the range-extended vehicle is determined to be in a long stop state. During a long stop, switching to EGR secondary cooling water cooling provides a better cooling effect.

[0070] S351. When the duration of the shutdown command is determined to be longer than the preset duration, the first channel of the first solenoid three-way valve is closed and the second and third channels are opened. At the same time, the first channel of the second solenoid three-way valve is closed and the second and third channels are opened.

[0071] The preset duration can be set according to the actual situation. When the stop command duration of the range-extended vehicle is less than or equal to the preset duration, the range-extended vehicle is in a short stop state. When the stop command duration of the range-extended vehicle is greater than the preset duration, the range-extended vehicle is in a long stop state.

[0072] Understandably, when the engine is determined to be in EGR mode, the temperature of the turbocharger's intermediate body is greater than or equal to the preset temperature value, the state of charge of the range-extended vehicle is less than or equal to the preset state of charge, and the shutdown command duration is longer than the preset duration, it indicates that the range-extended vehicle is in a long-term shutdown state. Controlling the first channel of the first solenoid three-way valve to close and the second and third channels to open, while controlling the first channel of the second solenoid three-way valve to close and the second and third channels to open, can switch to EGR secondary cooling water circulation to cool the intermediate body, which can achieve a better cooling effect.

[0073] Optionally, based on the above embodiments, after step S341, step S352 is also included.

[0074] S352. When the duration of the shutdown command is determined to be less than or equal to the preset duration, the first and third channels of the first solenoid three-way valve are opened and the second channel is closed. At the same time, the first and third channels of the second solenoid three-way valve are opened and the second channel is closed.

[0075] Understandably, when the engine is determined to be in EGR mode, the temperature of the turbocharger intermediate body is greater than or equal to the preset temperature value, the state of charge of the range extender vehicle is less than the preset state of charge, and the shutdown command duration is less than or equal to the preset duration, it indicates that the range extender vehicle is in a short-term shutdown state. The first and third channels of the first solenoid three-way valve are opened, and the second channel is closed. At the same time, the first and third channels of the second solenoid three-way valve are opened, and the second channel is closed. At this time, the turbocharger intermediate body is cooled only by the engine circulating water. The temperature of the turbocharger intermediate body will not exceed the safe temperature by much in a short time, and there is no need to switch to low-temperature water.

[0076] Optionally, based on the above embodiments, after step S320, steps S331 to S342 are also included.

[0077] S331. When it is determined that the temperature of the intermediate body of the turbocharger is lower than the preset temperature value, obtain the shutdown command duration of the range extender vehicle.

[0078] S342. When the shutdown command duration is determined to be longer than the preset duration, the first channel of the first solenoid three-way valve is closed and the second and third channels are opened. At the same time, the first channel of the second solenoid three-way valve is closed and the second and third channels are opened. The temperature of the intermediate body of the booster is monitored in real time.

[0079] Understandably, when the temperature of the turbocharger's intermediate body is determined to be lower than the preset temperature value, it indicates that the turbocharger's intermediate body is in a low-temperature state and the temperature is within the safe range. When the shutdown command duration is longer than the preset duration, it indicates that the range-extended vehicle is in a long-term shutdown state. The first and third channels of the first solenoid three-way valve are opened, and the second channel is closed. At the same time, the first and third channels of the second solenoid three-way valve are opened, and the second channel is closed. At this time, the turbocharger's intermediate body is cooled by the engine's circulating water, but the temperature of the turbocharger's intermediate body needs to be monitored in real time.

[0080] Optionally, based on the above embodiments, after step S342, step S353 is also included.

[0081] S353. When it is determined that the temperature of the intermediate body of the turbocharger is greater than or equal to the preset temperature value, the first channel of the first solenoid three-way valve is closed and the second and third channels are opened. At the same time, the first channel of the second solenoid three-way valve is closed and the second and third channels are opened.

[0082] Understandably, when the engine is determined to be in EGR mode, the temperature of the turbocharger intermediate body is lower than the preset temperature value, and the shutdown command duration is longer than the preset duration, the temperature of the turbocharger intermediate body will be monitored in real time. When the temperature of the turbocharger intermediate body is determined to be greater than or equal to the preset temperature value, the first channel of the first solenoid three-way valve will be closed, and the second and third channels will be opened. At the same time, the first channel of the second solenoid three-way valve will be closed, and the second and third channels will be opened. This allows for timely switching to EGR secondary cooling water circulation to cool the intermediate body, ensuring that the temperature of the intermediate body is within a safe range.

[0083] Optionally, based on the above embodiments, after step S331, the method further includes:

[0084] S343. When the duration of the shutdown command is determined to be less than or equal to the preset duration, the first channel of the first solenoid three-way valve is closed and the second and third channels are opened. At the same time, the first channel of the second solenoid three-way valve is closed and the second and third channels are opened.

[0085] Understandably, when the engine is determined to be in EGR mode, the temperature of the turbocharger intermediate body is lower than the preset temperature value, and the shutdown command duration is less than or equal to the preset duration, the first channel of the first solenoid three-way valve is closed, and the second and third channels are opened. At the same time, the first channel of the second solenoid three-way valve is closed, and the second and third channels are opened. The first and third channels of the first solenoid three-way valve are opened, and the second channel is closed. At the same time, the first and third channels of the second solenoid three-way valve are opened, and the second channel is closed. At this time, the turbocharger intermediate body is cooled only by the engine circulating water. The temperature of the turbocharger intermediate body will not exceed the safe temperature by much in a short time, and there is no need to switch to low-temperature water.

[0086] Optionally, based on the above embodiments, after step S310, the method further includes:

[0087] S321. 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. At the same time, the first channel of the second solenoid three-way valve is closed and the second and third channels are opened.

[0088] Understandably, when it is determined that the engine is not in EGR mode, the first channel of the first solenoid three-way valve is closed and the second and third channels are opened. At the same time, the first channel of the second solenoid three-way valve is closed and the second and third channels are opened, switching to EGR secondary cooling water cooling intermediate, which can achieve better cooling effect.

[0089] In summary, the embodiments of the present invention have the following advantages: 1. Simple structural modification and rational resource utilization: The original low-pressure EGR secondary cooling water circulation is introduced into the intermediate cooling circuit of the turbocharger. The first electromagnetic three-way valve and the second electromagnetic three-way valve are connected / disconnected from the original intermediate cooling water circuit, making rational use of resources. 2. Precise intermediate temperature control, extending the service life of the turbocharger and ensuring system reliability: It fully covers special scenarios such as no EGR operation, long-term shutdown, and abnormal temperature. Dynamic adjustment of the cooling circuit can achieve precise cooling of the turbocharger intermediate, avoid lubricating oil coking and bearing wear, and ensure stability and reliability.

[0090] Figure 4 This is a schematic diagram of a turbocharger cooling device provided in an embodiment of the present invention. This turbocharger cooling device is used to perform the turbocharger cooling method described in the above embodiments. (Refer 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 connected to the first input terminal of the first radiator 13, and the first water tank 12 is connected to the second input terminal of the first radiator 13; the upstream of the second water pump 22 is connected to the downstream of the EGR secondary cooler 21, the downstream of the second water pump 22 is connected to the first input terminal of the second radiator 24, and the second water tank 23 is connected to the second input terminal of the second radiator 24; the first channel of the first electromagnetic three-way valve 3 is connected to the downstream of the first radiator 13, the second channel is connected to the downstream of the second radiator 24, and the third channel is connected to the intermediate body of the booster 62; the first channel of the second electromagnetic three-way valve 4 is connected to the upstream of the first water pump 11, the second channel is connected to the upstream of the EGR secondary cooler 21, and the third channel is connected to the intermediate body of the booster 62.

[0096] This invention also provides a range-extended vehicle, including the turbocharger cooling system provided in the above embodiments.

[0097] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0098] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. 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 modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

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, and 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, the engine cooling water circulation circuit, the EGR secondary cooling water circulation circuit, the first electromagnetic three-way valve, and the second electromagnetic three-way valve; the engine cooling water circulation circuit includes the first cooling device, and the EGR secondary cooling water circulation circuit includes the 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.

Images