Vehicle pressurization system and pressurization method

Abstract

The invention relates to a vehicle pressurization system and method. The vehicle pressurization system comprises a turbine shell; the turbine sleeve body is arranged on the periphery of the turbine shell in a sleeving mode, and a turbine heat preservation cavity is jointly defined by the inner side wall of the turbine sleeve body and the outer side wall of the turbine shell; the first air conditioner branch is communicated with the turbine heat preservation cavity, the first air conditioner branch is used for being connected with an air conditioner main path, the first air conditioner branch is provided with a first opening and closing valve, the first opening and closing valve is in signal connection with a controller, and the controller is used for controlling the first opening and closing valve to be opened or closed. The turbine sleeve body is arranged on the periphery of the turbine shell in a sleeving mode to form the turbine heat preservation cavity, so that when the first opening and closing valve is opened, gas of the air conditioner main path can enter the turbine heat preservation cavity through the first air conditioner branch path, and the problems that in the related technology, when a vehicle is in an extremely cold environment, the temperature is too low, the expansion rate of exhaust is likely to be affected, and the service life of the vehicle is prolonged are solved. And therefore, the pressurization capacity is insufficient.

Description

Technical Field

[0001] The present application relates to the field of engines, and in particular to a vehicle supercharging system and a supercharging method. Background Art

[0002] The vehicle supercharging system is a system that uses the kinetic energy of the engine's operation to improve the engine's intake capacity. Currently, some vehicles use a mechanical supercharging system to use the rotational kinetic energy of the crankshaft to drive the turbine in the exhaust pipe to rotate, thereby driving the impeller in the intake pipe to rotate. Some vehicles use the exhaust gas supercharging system to use the kinetic energy of the vehicle's exhaust to drive the turbine to rotate, thereby driving the impeller to rotate, thereby meeting the engine's intake needs.

[0003] In the related art, considering that the high temperature of the gas released during turbocharging will reduce the efficiency of the engine, in order to reduce the temperature of the high-temperature air after turbocharging, an intercooler is installed between the supercharger and the engine to reduce the temperature of the engine. However, at this time, only the possible impact of the high temperature of the gas after turbocharging on the engine is considered. When the vehicle is in an extremely cold environment, the temperature is too low and may affect the expansion rate of the exhaust gas, resulting in insufficient supercharging capacity. Summary of the invention

[0004] The present application provides a vehicle supercharging system and supercharging method, which can solve the technical problem in the related art that when the vehicle is in an extremely cold environment, the temperature is too low which may affect the expansion rate of the exhaust gas, thereby resulting in insufficient supercharging capacity.

[0005] In a first aspect, an embodiment of the present application provides a vehicle supercharging system, comprising: a turbine housing; a turbine casing, the turbine casing being sleeved on the outer periphery of the turbine housing, and the inner side wall of the turbine casing and the outer side wall of the turbine housing together form a turbine insulation chamber; a first air-conditioning branch, the first air-conditioning branch being connected to the turbine insulation chamber, and the first air-conditioning branch being used to be connected to an air-conditioning main circuit, the first air-conditioning branch being provided with a first opening and closing valve, the first opening and closing valve signal being connected to a controller, and the controller being used to control the first opening and closing valve to be opened or closed.

[0006] In combination with the first aspect, in one embodiment, the vehicle supercharging system also includes a second air-conditioning branch, the second air-conditioning branch is spaced apart from the first air-conditioning branch, and the second air-conditioning branch is connected to the turbine insulation chamber, and the second air-conditioning branch is also used to connect to the air-conditioning compressor.

[0007] In combination with the first aspect, in one embodiment, the second air-conditioning branch is provided with a second on-off valve, the second on-off valve signal is connected to the controller, and the controller is used to control the second on-off valve to open or close.

[0008] In combination with the first aspect, in one embodiment, the turbine casing is equipped with a vent valve, the vent valve is connected to the controller signal, and the controller is used to control the vent valve to open or close.

[0009] In combination with the first aspect, in one embodiment, the vehicle boost system also includes a temperature sensor, which is used to be fixed at the throttle valve, and the temperature sensor signal is connected to the controller, and the controller is used to control the first opening and closing valve to open or close according to the temperature signal obtained by the temperature sensor.

[0010] In the second aspect, an embodiment of the present application provides a supercharging method using the above-mentioned vehicle supercharging system, which includes the following steps: determining whether the operating data of the engine and the ambient temperature are abnormal; if the operating data are abnormal and the ambient temperature is abnormal, turning on the air conditioning and heating, and controlling the first opening and closing valve to open, so that the air conditioning and heating enter the turbine insulation chamber through the first air conditioning branch; otherwise controlling the first opening and closing valve or the air conditioning and heating to close.

[0011] In combination with the second aspect, in one embodiment, the determination of whether the engine's operating data and the ambient temperature are abnormal includes: obtaining the ambient temperature through a temperature sensor disposed near the throttle valve, and determining whether the ambient temperature is lower than a preset temperature, if the ambient temperature is lower than the preset temperature, it is abnormal; and obtaining the engine's speed data, and determining whether the speed is higher than a preset value, if the speed is higher than the preset value, it is abnormal.

[0012] In combination with the second aspect, in one embodiment, the controlling of the first opening and closing valve to open allows the air-conditioning warm air to enter the turbine insulation chamber through the first air-conditioning branch, and also includes: controlling the second opening and closing valve in the second air-conditioning branch connected to the turbine insulation chamber to open, so that the warm air that enters the turbine insulation chamber through the first air-conditioning branch enters the second air-conditioning branch, and the warm air enters the air-conditioning compressor connected to the second air-conditioning branch.

[0013] In combination with the second aspect, in one embodiment, the control of the first on-off valve or the air conditioning and heating to be turned off includes: if the air conditioning and heating are in the on state, controlling the first on-off valve to be closed; if the air conditioning and heating are in the off state, controlling both the first on-off valve and the second on-off valve to be opened, and turning on the air pump so that the gas from the air pump enters the second air conditioning branch from the first air conditioning branch via the turbine insulation chamber.

[0014] In combination with the second aspect, in one embodiment, after controlling the first opening and closing valve to close, the method further includes: controlling the ventilation valve installed on the turbine casing to open.

[0015] The beneficial effects brought by the technical solution provided in the embodiments of the present application include:

[0016] A turbine insulation chamber is formed by sleeved turbine casing on the outer periphery of the turbine casing. When the first opening and closing valve is opened, the gas in the air-conditioning main circuit can enter the turbine insulation chamber through the first air-conditioning branch circuit. When the vehicle is in an extremely cold environment and the engine is under high load, the air-conditioning warm air can be transmitted to the turbine insulation chamber through the air-conditioning main circuit to insulate the exhaust gas in the turbine casing, thereby effectively reducing the possibility of insufficient driving ability of the turbine due to insufficient expansion rate of the exhaust gas due to rapid cooling in an extremely low temperature environment. This solves the technical problem in the related technology that when the vehicle is in an extremely cold environment, the temperature is too low which may affect the expansion rate of the exhaust gas, thereby resulting in insufficient boosting capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 A schematic diagram of the structure of a vehicle boosting system provided in an embodiment of the present application;

[0019] Figure 2 A flow chart of a vehicle supercharging method provided in an embodiment of the present application.

[0020] In the figure:

[0021] 1. Turbine casing; 2. Turbine sleeve; 3. Turbine insulation chamber; 4. First air-conditioning branch; 5. Second air-conditioning branch; 6. Air-conditioning compressor; 7. Air-conditioning main circuit. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0023] The embodiment of the present application provides a vehicle supercharging system, which can solve the technical problem in the related art that when the vehicle is in an extremely cold environment, the temperature is too low which may affect the expansion rate of the exhaust gas, thereby resulting in insufficient supercharging capacity.

[0024] See also Figure 1As shown, a vehicle supercharging system provided by an embodiment of the present application may include: a turbine housing 1; a turbine casing 2, wherein the turbine casing 2 is sleeved on the outer periphery of the turbine casing 1, and the inner wall of the turbine casing 2 and the outer wall of the turbine casing 1 together form a turbine insulation chamber 3, and the turbine casing 2 may be made of the same material as the turbine casing 1; a first air-conditioning branch 4, wherein the first air-conditioning branch 4 is connected to the turbine insulation chamber 3, and the first air-conditioning branch 4 is used to be connected to the air-conditioning main circuit 7, the first air-conditioning branch 4 is provided with a first opening and closing valve, and the first opening and closing valve signal is connected to a controller, and the controller is used to control the opening or closing of the first opening and closing valve, and the connection between the first air-conditioning branch 4 and the air-conditioning main circuit 7 can be controlled by controlling the opening or closing of the first opening and closing valve.

[0025] In the embodiment of the present application, a turbine casing 2 is sleeved on the outer periphery of the turbine casing 1 to form a turbine heat preservation chamber 3. The turbine casing 2 can be directly fixed to the turbine casing 1, that is, the outer wall of the turbine casing 1 and the inner wall of the turbine casing 2 are connected by a connector. In some other embodiments, the turbine casing 2 can also be fixed to the chassis of the vehicle. At this time, there may be no direct connection between the turbine casing 2 and the turbine casing 1, but the turbine casing 2 is fixed to the vehicle chassis so that the turbine casing 2 is surrounded by the outer periphery of the turbine casing 1. In the embodiment of the present application, when the controller controls the first on-off valve to open, The gas in the air-conditioning main circuit 7 can enter the turbine insulation chamber 3 through the first air-conditioning branch circuit 4. When the vehicle is in an extremely cold environment and the engine is under high load, the first opening and closing valve can be opened to transmit the air-conditioning warm air to the turbine insulation chamber 3 through the air-conditioning main circuit 7 to insulate the exhaust gas in the turbine housing 1, thereby effectively reducing the possibility of insufficient driving ability of the turbine due to insufficient expansion rate caused by rapid cooling of the exhaust gas in an extremely low temperature environment, thereby solving the technical problem that the related technology only considers the possible impact of excessively high gas temperature after supercharging on the engine and cannot fully meet the vehicle's use environment.

[0026] In some optional embodiments, the vehicle supercharging system further includes a second air conditioning branch 5, the second air conditioning branch 5 is spaced apart from the first air conditioning branch 4, and the second air conditioning branch 5 is connected to the turbine heat preservation chamber 3, and the second air conditioning branch 5 is also used to connect to the air conditioning compressor 6. By setting the second air conditioning branch 5, the consumption of some energy can be reduced. Specifically, when the air conditioning heater is turned on, and the warm air enters the turbine heat preservation chamber 3 through the first air conditioning branch 4 to keep the turbine housing 1 warm or heat it up, the warm air continues to act on the air conditioning compressor 6 through the second air conditioning branch 5, so as to make the best use of resources and reduce the waste of air conditioning gas pressure. And by setting the second air conditioning branch 5, the performance requirements of the air conditioning compressor 6 can be reduced accordingly during production and manufacturing, so as to reduce the production and manufacturing costs of the vehicle.

[0027] In some optional embodiments, the second air-conditioning branch 5 is provided with a second opening and closing valve, and the second opening and closing valve signal is connected to the controller. The controller is used to control the opening or closing of the second opening and closing valve, that is, the second air-conditioning branch 5 can also be provided with a second opening and closing valve for controlling the opening or closing of the second air-conditioning branch 5. During vehicle driving, the driver can control the opening or closing of the second opening and closing valve through the controller according to actual needs. Specifically, when the ambient temperature is extremely low and the exhaust gas expansion rate in the turbine casing 1 is far from meeting the requirements, the second opening and closing valve can be closed to allow warm air to continuously enter the turbine insulation chamber 3, thereby enhancing the insulation effect of the gas in the turbine insulation chamber 3 on the turbine casing 1.

[0028] In some optional embodiments, the turbine casing 2 is equipped with a vent valve, which is connected to the controller signal, and the controller is used to control the vent valve to open or close. By setting the vent valve, when the controller controls the vent valve to open, the turbine insulation chamber 3 can be connected to the external environment. When the vehicle is driving in a suitable environment, ventilation through the vent valve can achieve a cooling effect on the turbine casing 1 and reduce the temperature of the exhaust gas in the turbine casing 1. In some other embodiments, the turbine casing 1 and the exhaust gas therein need to be cooled in a certain form.

[0029] In some optional embodiments, the vehicle supercharging system also includes a temperature sensor, which is used to be fixed at the throttle valve, and the temperature sensor signal is connected to the controller. The controller is used to control the opening or closing of the first on-off valve according to the temperature signal obtained by the temperature sensor. The throttle valve serves as a controllable valve for controlling the air entering the engine. In the embodiment of the present application, the temperature sensor is fixed at the throttle valve close to the engine. The temperature of the air entering the engine can be monitored in real time. Specifically, the air enters the intake pipe from the throttle valve. The air temperature obtained here is less affected by the engine combustion, so the ambient temperature can be obtained more accurately. In order to facilitate the precise control of the fuel injection and ignition process during vehicle driving, a temperature sensor is usually set at the throttle valve to measure the temperature entering the throttle valve. In the embodiment of the present application, the temperature signal obtained by the temperature sensor installed at the throttle valve is used to control the opening or closing of the first on-off valve, which can save material usage and save production costs.

[0030] See also Figure 2 As shown, the embodiment of the present application also provides a supercharging method using the vehicle supercharging system as described above, which may include the following steps:

[0031] S1: Determine whether the engine operation data and the ambient temperature are abnormal. The engine operation data and the ambient temperature can be input into the ECU controller, and the abnormal situation can be determined in the ECU controller.

[0032] S2: If the operating data and the ambient temperature are abnormal, the air conditioning and heating are turned on, and the first opening and closing valve is controlled to open, so that the air conditioning and heating enter the turbine heat preservation chamber 3 through the first air conditioning branch 4, that is, when the ECU controller determines that the engine operating data and the ambient temperature are both in an abnormal state, the first opening and closing valve is controlled to open. It should be understood that the above-mentioned controllers can all refer to ECU controllers.

[0033] S3: Otherwise, the first opening and closing valve or the air conditioner and heater are controlled to be closed. It should be understood that when the ECU controller determines that the engine operation data is not in a set abnormal situation, or the ambient temperature is not in a set abnormal situation, or the engine operation data and the ambient temperature are not in an abnormal situation, the first opening and closing valve can be controlled to be closed. In addition, when it is detected that the engine operation data or the ambient temperature is not in an abnormal situation, but the air conditioner and heater are not turned on, the first opening and closing valve can also be controlled to be closed.

[0034] In some optional embodiments, the determination of whether the engine's operating data and ambient temperature are abnormal may include: obtaining the ambient temperature through a temperature sensor disposed near the throttle valve, and determining whether the ambient temperature is lower than a preset temperature; if the ambient temperature is lower than the preset temperature, it is abnormal. In the embodiment of the present application, the preset temperature may be set to -20°C, that is, when the ambient temperature obtained by the temperature sensor is lower than -20°C, the ambient temperature is determined to be abnormal; and obtaining the engine's speed data, and determining whether the speed is higher than a preset value; if the speed is higher than the preset value, it is abnormal. It should be understood that the abnormality at this time does not refer to engine damage or other abnormal conditions, but refers to the engine's speed data being higher than a set preset value interval. By determining whether the speed data is higher than the preset interval, the first opening and closing valve is controlled to be opened or closed.

[0035] In some optional embodiments, the control of the first opening and closing valve to open, so that the air conditioning heater enters the turbine insulation chamber 3 through the first air conditioning branch 4, can also include: controlling the second opening and closing valve in the second air conditioning branch 5 connected to the turbine insulation chamber 3 to open, so that the heater entering the turbine insulation chamber 3 through the first air conditioning branch 4 enters the second air conditioning branch 5, and the heater enters the air conditioning compressor 6 connected to the second air conditioning branch 5, that is, the first opening and closing valve and the second opening and closing valve can be synchronously driven to open and close by the controller, reducing the operation steps. It should be understood that, under normal circumstances, before the ambient temperature is detected to be lower than the preset temperature, the driver has already turned on the air conditioning heater for driving comfort. Therefore, when the controller determines that the engine operation data and the ambient temperature are both in abnormal conditions and controls the first opening and closing valve and the second opening and closing valve to open, the air conditioning heater is already in the open state, and part of the heater can directly enter the turbine insulation chamber 3 through the first air conditioning branch 4. In some other embodiments, the first on-off valve and the second on-off valve may also be opened or closed by the controller, so that the first on-off valve and the second on-off valve may be opened or closed, respectively, in different ambient temperatures and vehicle operating conditions.

[0036] In some optional embodiments, the control of closing the first opening and closing valve or the air conditioning and heater may include: if the air conditioning and heater are in the on state, the first opening and closing valve is controlled to be closed, that is, when it is determined that the operating data of the engine is not in the set abnormal condition, or the ambient temperature is not in the set abnormal condition, and the air conditioning and heater are in the on state, the first opening and closing valve can be closed to prevent the heating air from entering the turbine insulation chamber 3 from the first air conditioning branch 4. At this time, the second opening and closing valve can be in the closed state or in the open state; if the air conditioning and heater are in the off state, the first opening and closing valve and the second opening and closing valve are controlled to be opened, and the air pump is turned on to allow the gas of the air pump to enter the turbine insulation chamber 3 from the first air conditioning branch 4 through the turbine insulation chamber 3 enters the second air conditioning branch 5. It should be understood that the air conditioning main line and the air pump line can be the same line, that is, when the air conditioning heating is turned off, there may be no heating transmission in the air conditioning main line 7. At this time, opening the first opening and closing valve and the second opening and closing valve can make the first air conditioning branch 4, the turbine insulation chamber 3 and the second air conditioning branch 5 in a connected state. At this time, if the air pump on the vehicle is turned on, the gas of the air pump can enter the turbine insulation chamber 3 from the first air conditioning branch 4, so that the periphery of the turbine housing 1 can have gas circulation, which has a certain cooling effect. After passing through the turbine housing 1, the temperature of the gas may rise to a certain extent, and the risen gas can be blown to the air conditioning compressor 6 through the second air conditioning branch 5. In some other embodiments, if the turbine housing 1 is provided with a vent valve, the second opening and closing valve can also be closed at this time, and the vent valve can be opened to allow the gas to flow to the outside.

[0037] In some optional embodiments, after controlling the first opening and closing valve to close, the control may also include: controlling the ventilation valve installed on the turbine casing 2 to open, that is, when it is determined that the engine operating data is not in a set abnormal condition, or the ambient temperature is not in a set abnormal condition, and the air conditioning and heating are turned on, the first opening and closing valve is in a closed state, effectively preventing heating from entering the turbine insulation chamber 3 from the first air conditioning branch 4. At this time, the ventilation valve can be opened to enable gas flow in the turbine insulation chamber 3 and the outside world, which has a certain cooling effect on the turbine casing 1. At this time, the second opening and closing valve can be either closed or open.

[0038] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0039] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0040] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A vehicle supercharging system, characterized in that: It includes: Turbine housing (1); A turbine casing (2), wherein the turbine casing (2) is sleeved on the outer circumference of the turbine casing (1), and the inner side wall of the turbine casing (2) and the outer side wall of the turbine casing (1) together form a turbine heat preservation chamber (3); A first air conditioning branch (4), the first air conditioning branch (4) is in communication with the turbine heat preservation chamber (3), and the first air conditioning branch (4) is used to be connected to an air conditioning main circuit (7), the first air conditioning branch (4) is provided with a first opening and closing valve, the first opening and closing valve signal is connected to a controller, and the controller is used to control the first opening and closing valve to open or close.

2. The vehicle boosting system according to claim 1, characterized in that: The vehicle supercharging system further comprises a second air-conditioning branch (5), the second air-conditioning branch (5) being spaced apart from the first air-conditioning branch (4), and the second air-conditioning branch (5) being connected to the turbine heat preservation chamber (3), and the second air-conditioning branch (5) being further used for connecting to an air-conditioning compressor (6).

3. The vehicle boosting system according to claim 2, characterized in that: The second air-conditioning branch (5) is provided with a second opening and closing valve, the second opening and closing valve signal is connected to the controller, and the controller is used to control the second opening and closing valve to open or close.

4. The vehicle boost system according to claim 1, characterized in that: The turbine casing (2) is provided with a vent valve, the vent valve is connected to the controller signal, and the controller is used to control the vent valve to open or close.

5. The vehicle boosting system according to claim 1, characterized in that: The vehicle supercharging system also includes a temperature sensor, which is used to be fixed at the throttle valve, and the temperature sensor signal is connected to the controller. The controller is used to control the first on-off valve to open or close according to the temperature signal obtained by the temperature sensor.

6. A supercharging method using the vehicle supercharging system as claimed in any one of claims 1 to 5, characterized in that: It includes the following steps: Determine whether the engine's operating data and ambient temperature are abnormal; If the operating data is abnormal and the ambient temperature is abnormal, the air conditioning and heating are turned on, and the first opening and closing valve is controlled to open, so that the air conditioning and heating enter the turbine heat preservation chamber (3) through the first air conditioning branch (4); Otherwise, the first opening and closing valve or the air conditioning and heating is controlled to be closed.

7. The pressure increasing method according to claim 6, characterized in that: The determining whether the engine operating data and the ambient temperature are abnormal includes: The ambient temperature is obtained by a temperature sensor arranged near the throttle to determine whether the ambient temperature is lower than a preset temperature. If the ambient temperature is lower than the preset temperature, it is abnormal; And obtain the engine speed data to determine whether the speed is higher than a preset value. If the speed is higher than the preset value, it is abnormal.

8. The pressure increasing method according to claim 6, characterized in that: The method of controlling the first opening and closing valve to open so that the air-conditioning heating air enters the turbine heat preservation chamber (3) through the first air-conditioning branch (4) also includes: A second opening and closing valve in a second air conditioning branch (5) connected to the turbine heat preservation chamber (3) is controlled to open, so that warm air entering the turbine heat preservation chamber (3) through the first air conditioning branch (4) enters the second air conditioning branch (5), and the warm air enters an air conditioning compressor (6) connected to the second air conditioning branch (5).

9. The pressurization method according to claim 8, characterized in that: The controlling of the first opening and closing valve or the air conditioning and heating to be turned off comprises: If the air conditioner and heater are in the on state, the first opening and closing valve is controlled to be closed; If the air conditioning and heating system is in the off state, the first on-off valve and the second on-off valve are controlled to open, and the air pump is turned on, so that the gas from the air pump enters the second air conditioning branch (5) from the first air conditioning branch (4) through the turbine heat preservation chamber (3).

10. The pressurization method according to claim 9, characterized in that: After controlling the first on-off valve to close, the method further comprises: The ventilation valve installed on the turbine casing (2) is controlled to open.

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