Composite supercharging system for improving transient response performance of internal combustion engine and working method

Abstract

The invention discloses a composite supercharging system for improving transient response performance of an internal combustion engine and a working method, and belongs to the technical field of internal combustion engines, the composite supercharging system comprises the internal combustion engine, the internal combustion engine is connected with the composite supercharging system, and a mechanical transmission system is arranged between the internal combustion engine and the composite supercharging system; the composite supercharging system comprises a first-stage gas compressor and a second-stage gas compressor, and the gas compressors are connected with a turbine through supercharger shafts. The mechanical transmission system comprises a clutch which is connected with a crankshaft of the internal combustion engine through a belt pulley and connected with an input shaft of a planetary gear, and an output shaft of the planetary gear is connected with a supercharger shaft through a composite mechanical shaft. A crankshaft is connected with a supercharger shaft between a turbine and an air compressor through a belt pulley, a clutch and a planetary gear, so that when the load in an internal combustion engine is increased or the internal combustion engine is in an acceleration working condition, the rotating speed of the air compressor is increased, the air supply amount is increased, and the air inflow under transient response is improved; when the rotating speed of the internal combustion engine is too high, waste heat energy which is not fully utilized in the turbine can be recycled.

Description

Technical Field

[0001] The present invention belongs to the technical field of internal combustion engines, and in particular relates to a compound supercharging system and a working method for improving the transient response performance of an internal combustion engine. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] Traditional turbocharged internal combustion engine systems use a single-vortex single-compression approach, but are limited by the flow characteristics of the turbocharger compressor. In traditional turbocharged internal combustion engine systems, the compressor can only operate in a relatively narrow high-efficiency zone.

[0004] To solve this technical problem, the existing technology adopts a multi-turbine supercharging system. For example, patent CN1737346A discloses a large and small turbocharger series-parallel adjustable high-boost system, which adopts large and small turbines and realizes two-stage supercharging and sequential supercharging by adjusting the opening and closing of the bypass valve or the three-way valve, thereby adapting to a wider range of operating conditions.

[0005] However, the above solution still has two technical problems: 1. The transient response performance is insufficient due to the intake hysteresis effect and cannot be solved; 2. Energy recovery from the high-speed turbine cannot be performed. Summary of the Invention

[0006] In response to the above problems, the present invention provides a compound supercharging system and working method for improving the transient response performance of an internal combustion engine. The system can solve the hysteresis effect of the intake air during transient operation of a compound supercharged internal combustion engine and improve the transient response performance of the internal combustion engine. The system can also recover energy from a high-speed turbine by changing the planetary gear ratio. The system can also realize two-stage supercharging and sequential supercharging by opening and closing different valves.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] A first aspect provides a compound supercharging system for improving transient response performance of an internal combustion engine, comprising an internal combustion engine connected to the compound supercharging system, and a mechanical transmission system disposed between the internal combustion engine and the compound supercharging system;

[0009] The compound supercharging system includes a first-stage compressor and a second-stage compressor, wherein the first-stage compressor is connected to the first-stage turbine via a first supercharger shaft, and the second-stage compressor is connected to the second-stage turbine via a second supercharger shaft;

[0010] The mechanical transmission system includes a clutch, the input end of the clutch is connected to the crankshaft of the internal combustion engine through a pulley, the output end of the clutch is connected to the input shaft of the planetary gear, and the output shaft of the planetary gear is connected to the first supercharger shaft and the second supercharger shaft through a composite mechanical shaft.

[0011] Preferably, the first-stage compressor is connected to a first-stage intercooler, the first-stage intercooler is respectively connected to the internal combustion engine and the second-stage compressor, and the second-stage compressor is connected to the internal combustion engine through the second-stage intercooler.

[0012] Preferably, the first-stage intercooler, the first-stage compressor, the second-stage compressor, the second-stage intercooler, and the internal combustion engine are connected in sequence through an intake main line, and a compressor three-way valve is provided between the first-stage intercooler and the second-stage compressor; the first-stage compressor, the first-stage intercooler, and the internal combustion engine are connected in sequence through an intake bypass line, and a first-stage compressor bypass valve is provided between the first-stage intercooler and the internal combustion engine.

[0013] Preferably, the compressor three-way valve includes a first port A, a first port B, and a first port C, wherein the first port A is connected to the first-stage compressor, the first port B is connected to the second-stage compressor, and the first port C is connected to the atmosphere.

[0014] Preferably, the internal combustion engine is connected to the first-stage turbine and the second-stage turbine through an exhaust pipe; the exhaust pipe includes an exhaust main pipe and an exhaust bypass pipe, the internal combustion engine, the second-stage turbine, and the first-stage turbine are connected in sequence through the exhaust main pipe, and the internal combustion engine and the first-stage turbine are connected in sequence through the exhaust bypass pipe.

[0015] Preferably, a secondary turbine bypass valve is provided on the exhaust bypass line between the internal combustion engine and the primary turbine; a turbine three-way valve is provided on the exhaust main line between the secondary turbine and the primary turbine, and the turbine three-way valve includes a second A port, a second B port, and a second C port, wherein the second A port is connected to the secondary turbine, the second B port is connected to the primary turbine, and the second C port is connected to the atmosphere.

[0016] Preferably, the compressor three-way valve, turbine three-way valve, first-stage compressor bypass valve, and second-stage turbine bypass valve are all solenoid valves, and are all connected to the controller.

[0017] A second aspect provides a method for operating a compound supercharging system for improving the transient response performance of an internal combustion engine, which utilizes the compound supercharging system for improving the transient response performance of an internal combustion engine, comprising:

[0018] When the internal combustion engine is in a low-speed, low-torque operating condition, the first A port and the first B port of the compressor three-way valve are controlled to open, the first C port is closed, the first-stage compressor bypass valve is closed, the second A port and the second B port of the turbine three-way valve are opened, the second C port is closed, and the second-stage turbine bypass valve is closed; at the same time, the clutch in the mechanical transmission system is controlled to be disengaged, so that the crankshaft is disconnected from the first supercharger shaft and the second supercharger shaft;

[0019] When the internal combustion engine is in a high-speed, high-torque operating condition, the first A port of the compressor three-way valve is controlled to be closed, the first B port and the first C port are opened, the first-stage compressor bypass valve is opened, the second A port and the second C port of the turbine three-way valve are opened, the second B port is closed, and the second-stage turbine bypass valve is opened; at the same time, the clutch in the mechanical transmission system is controlled to engage, so that the crankshaft is connected to the first supercharger shaft and the second supercharger shaft.

[0020] Preferably, when the clutch is engaged and the speed of the internal combustion engine is too high, the planetary gear ratio is adjusted so that the output shaft speed of the planetary gear is less than the speed of the first supercharger shaft and the second supercharger shaft, thereby converting the waste heat energy in the turbine that has not been fully utilized into mechanical energy and outputting it to the crankshaft.

[0021] Preferably, when the clutch is engaged, when the load in the internal combustion engine increases or is in an acceleration condition, the planetary gear ratio is adjusted so that the output shaft speed of the planetary gear is greater than the speed of the first supercharger shaft and the second supercharger shaft, thereby increasing the compressor speed and the air supply.

[0022] Compared with the prior art, the present invention has the following advantages and positive effects:

[0023] In the present invention, the crankshaft is connected to the supercharger shaft between the turbine and the compressor through a pulley, a clutch, and a planetary gear. When the load in the internal combustion engine increases or the engine is in an acceleration condition, the planetary gear transmission ratio can be adjusted so that the output shaft speed of the planetary gear is greater than the speed of the first supercharger shaft and the second supercharger shaft, thereby increasing the compressor speed, increasing the air supply, and effectively improving the intake volume under transient response. When the speed of the internal combustion engine is too high, the planetary gear transmission ratio can be adjusted so that the output shaft speed of the planetary gear is less than the speed of the first supercharger shaft and the second supercharger shaft, thereby converting the waste heat energy in the turbine that has not been fully utilized into mechanical energy and outputting it to the crankshaft, thereby recovering the waste heat energy in the turbine that has not been fully utilized. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0025] Figure 1 is a schematic structural diagram of a boosting system according to Embodiment 1 or 2 of the present invention;

[0026] In the picture:

[0027] 1. First-stage compressor; 2. First-stage intercooler; 3. Compressor three-way valve; 4. Second-stage compressor; 5. Second-stage intercooler; 6. Internal combustion engine; 7. Second-stage turbine; 8. Turbine three-way valve; 9. First-stage turbine; 10. Pulley; 11. Clutch; 12. Planetary gear; 13. First-stage compressor bypass valve; 14. Second-stage turbine bypass valve. DETAILED DESCRIPTION

[0028] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0029] The present invention will be described in detail below with reference to the accompanying drawings.

[0030] Example 1

[0031] This embodiment discloses a compound supercharging system for improving the transient response performance of an internal combustion engine. Figure 1 As shown, it includes an internal combustion engine 6, the intake and exhaust ports of the internal combustion engine 6 are connected to the compound supercharging system through corresponding intake and exhaust pipes, and a mechanical transmission system is arranged between the internal combustion engine 6 and the compound supercharging system. Specifically, the mechanical transmission system is connected between the crankshaft of the internal combustion engine 6 and the compound supercharging system.

[0032] like Figure 1 As shown, the compound supercharging system includes a first-stage compressor 1. A first supercharger shaft is connected between the first-stage compressor 1 and the first-stage turbine 9. The first-stage compressor 1 is connected to the first-stage intercooler 2, which is respectively connected to the air intake of the internal combustion engine 6 and the second-stage compressor 4. The second-stage compressor 4 is connected to the internal combustion engine 6 via the second-stage intercooler 5. The corresponding intake line is divided into two routes: one is the main intake line, and the other is the intake bypass line. It can be understood that the first-stage turbine 9 drives the first-stage compressor 1 through the first supercharger shaft to compress air.

[0033] Specifically, the first-stage compressor, the first-stage intercooler, the second-stage compressor, the second-stage intercooler, and the internal combustion engine are sequentially connected via an intake main line; the first-stage compressor, the first-stage intercooler, and the internal combustion engine are sequentially connected via an intake bypass line. More specifically, a first-stage compressor bypass valve 13 is provided on the intake bypass line between the first-stage intercooler and the internal combustion engine 6; a compressor three-way valve 3 is provided on the intake main line between the first-stage intercooler and the second-stage compressor 4; Figure 1As shown, the compressor three-way valve 3 includes a first A port, a first B port, and a first C port, wherein the first A port is connected to the first-stage compressor 1, the first B port is connected to the second-stage compressor 4, and the first C port is connected to the atmosphere, for air to enter the second-stage compressor. The first-stage intercooler and the second-stage intercooler are used to cool the compressed air. It can be understood that the first-stage compressor and the second-stage compressor are used to compress air and deliver the compressed air to the internal combustion engine 6.

[0034] As shown, Figure 1 the second-stage compressor 4 is connected to the second-stage turbine 7 through a second supercharger shaft, the second-stage turbine 7 is connected to the first-stage turbine 9 through a turbine three-way valve 8, and the turbine three-way valve 8 includes a second A port, a second B port, and a second C port, wherein the second A port is connected to the second-stage turbine 7, the second B port is connected to the first-stage turbine 9, and the second C port is connected to the atmosphere, for exhaust gas from the second-stage turbine to be directly discharged to the atmosphere.

[0035] As shown, Figure 1 the exhaust gas of the internal combustion engine 6 is connected to the first-stage turbine 9 and the second-stage turbine 7 through an exhaust pipeline. The exhaust pipeline includes an exhaust main pipeline and an exhaust bypass pipeline, specifically, the internal combustion engine, the second-stage turbine, the turbine three-way valve, and the first-stage turbine form the exhaust main pipeline, and the internal combustion engine and the first-stage turbine form the exhaust bypass pipeline. As shown, Figure 1 a second-stage turbine bypass valve 14 is arranged between the internal combustion engine 6 and the first-stage turbine 9.

[0036] It can be understood that when the first A port of the compressor three-way valve 3 is closed, the first B port and the first C port are opened, and the first-stage compressor bypass valve 13 is opened, one path of air enters the first-stage compressor to be compressed, the compressed air passes through the first-stage intercooler 2 and the first-stage compressor bypass valve 13 to enter the internal combustion engine 6, and the other path of air enters the second-stage compressor through the first C port to be compressed, and the compressed air passes through the second-stage intercooler 5 to enter the internal combustion engine. At the same time, the second A port and the second C port of the turbine three-way valve 8 are opened, the second B port is closed, the second-stage turbine bypass valve 14 is opened, the exhaust gas is discharged through the second-stage turbine bypass valve 14 and the first-stage turbine 9 in one path, and is discharged through the second-stage turbine 7 and the turbine three-way valve 8 in the other path, thereby realizing sequential supercharging.

[0037] When the first A port and the first B port of the compressor three-way valve 3 are opened, the first C port is closed, and the compressor three-way valve 3 is closed, the air is compressed by the first-stage compressor, cooled by the first-stage intercooler, and then reaches the second-stage compressor through the compressor three-way valve for further compression, and finally enters the internal combustion engine after being cooled again by the second-stage intercooler. At the same time, the second A port and the second B port of the turbine three-way valve 8 are opened, the second C port is closed, the second-stage turbine bypass valve 14 is closed, and the exhaust gas is discharged through the second-stage turbine 7, the turbine three-way valve 8, and the first-stage turbine 9, thereby realizing two-stage supercharging.

[0038] As shown, Figure 1As shown, the mechanical transmission system includes a clutch 11, the input end of the clutch 11 is connected to the crankshaft output end of the internal combustion engine through a pulley 10, the output end of the clutch 11 is connected to the input shaft of the planetary gear 12, and the output shaft of the planetary gear 12 is connected to the first supercharger shaft and the second supercharger shaft through gear meshing.

[0039] The compressor three-way valve 3, turbine three-way valve 8, first-stage compressor bypass valve 13, and second-stage turbine bypass valve 14 are all solenoid valves and are all connected to a controller. In this embodiment, the clutch 11 can utilize a conventional electromagnetic clutch, also connected to a controller. It is understood that the controller is conventional, and controlling the opening and closing of the solenoid valves via the controller is also achievable with conventional technology. In this embodiment, when the clutch is engaged, the crankshaft is connected to the first and second supercharger shafts via planetary gears. When the clutch is disengaged, the crankshaft is disconnected from the first and second supercharger shafts.

[0040] It is understood that when the exhaust gas passes through the first and second turbines, the first and second turbines rotate, driving the first and second supercharger shafts to rotate the first and second compressors, thereby compressing the air. When the clutch connects the crankshaft to the planetary gears, the transmission ratio of the planetary gears 12 is changed, so that the output shaft speed of the planetary gears 12 is greater than the speed of the first and second supercharger shafts. This allows the kinetic energy of the crankshaft to be ultimately transferred to the first and second supercharger shafts through the planetary gears, thereby driving the first and second supercharger shafts to rotate. When the transmission ratio of the planetary gears 12 is changed, so that the output shaft speed of the planetary gears 12 is less than the speed of the first and second supercharger shafts, the first and second supercharger shafts drive the planetary gears 12 to rotate, which in turn drives the crankshaft to rotate, thereby converting the unused waste heat energy in the turbine into mechanical energy that is output to the crankshaft.

[0041] Example 2

[0042] This embodiment provides an operating method of a compound supercharging system for improving the transient response performance of an internal combustion engine, using a compound supercharging system for improving the transient response performance of an internal combustion engine in Example 1, including:

[0043] When the internal combustion engine is in a low-speed, low-torque operating condition, the first A port and the first B port of the compressor three-way valve 3 are controlled to open, the first C port is closed, the first-stage compressor bypass valve is closed, the second A port and the second B port of the turbine three-way valve 8 are opened, the second C port is closed, and the second-stage turbine bypass valve 14 is closed; at the same time, the clutch 11 in the mechanical transmission system is controlled to be cut out, so that the crankshaft is disconnected from the first supercharger shaft and the second supercharger shaft.

[0044] At this time, the first stage compressor 1 and the second stage compressor 4 are operated in series, the air intake is pressurized by the first stage compressor 1, then cooled by the first stage intercooler 2, and directly enters the second stage compressor 4 for further pressurization, and then enters the internal combustion engine after being cooled by the second stage intercooler 5; the first stage turbine 9 and the second stage turbine 7 are also operated in series, the high-temperature exhaust gas is continuously discharged after passing through the second stage turbine 7 and the first stage turbine 9, and this working mode realizes two-stage supercharging.

[0045] When the internal combustion engine is in a high-speed and high-torque working condition, the first A port of the compressor three-way valve 3 is closed, the first B port and the first C port are opened, the first stage compressor bypass valve 13 is opened, the second A port and the second C port of the turbine three-way valve 8 are opened, the second B port is closed, the second stage turbine bypass valve 14 is opened, and the clutch in the mechanical transmission system is cut in, so that the crankshaft is connected with the first supercharger shaft and the second supercharger shaft.

[0046] At this time, the first stage compressor and the second stage compressor are operated in parallel, the air intake is divided into two paths: one path of air enters the first stage compressor for compression, and the compressed air is sent into the internal combustion engine 6 through the first stage intercooler 2 and the first stage compressor bypass valve 13; the other path of air enters the second stage compressor through the first C port for compression, and the compressed air enters the internal combustion engine through the second stage intercooler 5; the first stage turbine 9 and the second stage turbine 7 are also operated in parallel, the high-temperature exhaust gas is divided into two paths: one path is discharged through the second stage turbine bypass valve 14 and the first stage turbine 9, and the other path is discharged through the second stage turbine 7 and the turbine three-way valve 8, thereby realizing sequential supercharging.

[0047] When the speed is too high, the conventional turbine needs to open the bleed valve to avoid surge caused by the mismatch between the turbine supercharger and the internal combustion engine; but in the working condition of the present embodiment, the planetary gear transmission ratio is adjusted so that the output shaft speed of the planetary gear 12 is less than the speed of the first supercharger shaft and the second supercharger shaft, so that the first supercharger shaft and the second supercharger shaft drive the planetary gear 12 to rotate, thereby driving the crankshaft to rotate, converting the residual heat energy in the turbine into mechanical energy and outputting it to the crankshaft, achieving power recovery and improving the condition of reduced output torque at high speed of the engine.

[0048] When the load in the internal combustion engine increases or is in an acceleration working condition, the increase of cylinder injection amount leads to the decrease of air-fuel ratio, and at this time, the exhaust gas passing through the turbine is not enough to make the turbine drive the compressor to compress sufficient air into the internal combustion engine, thereby causing a hysteresis effect and leading to the phenomenon of insufficient air supply. The clutch 11 of the mechanical transmission system is cut in, so that the crankshaft is connected with the planetary gear 12 through the clutch, and the transmission ratio of the planetary gear 12 is adjusted, so that the crankshaft directly transmits kinetic energy to the compound supercharging system through the first supercharger shaft and the second supercharger shaft, the speed of the compressor increases, thereby increasing the air supply in the case of hysteresis effect and effectively improving the transient response.

[0049] A compound supercharging system used in this embodiment to improve the transient response performance of an internal combustion engine has the advantages of a twin-turbine twin-compressor and auxiliary supercharging; the twin-turbine twin-compressor can meet the intake requirements of high pressure ratio and large flow, and the supercharger shaft between the turbine and the compressor is connected by a crankshaft, a clutch, and a planetary gear, which can effectively improve the transient response and can also recover the waste heat energy in the turbine that has not been fully utilized.

[0050] Although the above describes the specific embodiments of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without any creative work are still within the scope of protection of the present invention.

Claims

1. A compound supercharging system for improving the transient response performance of an internal combustion engine, characterized in that: The internal combustion engine is connected to the composite supercharging system, and a mechanical transmission system is provided between the internal combustion engine and the composite supercharging system; The compound supercharging system includes a first-stage compressor and a second-stage compressor, wherein the first-stage compressor is connected to the first-stage turbine via a first supercharger shaft, and the second-stage compressor is connected to the second-stage turbine via a second supercharger shaft; The mechanical transmission system includes a clutch, the input end of the clutch is connected to the crankshaft output end of the internal combustion engine through a pulley, the output end of the clutch is connected to the input shaft of the planetary gear, and the output shaft of the planetary gear is connected to the first supercharger shaft and the second supercharger shaft through gear meshing.

2. A compound supercharging system for improving transient response performance of an internal combustion engine according to claim 1, characterized in that: The first-stage compressor is connected to the first-stage intercooler, the first-stage intercooler is respectively connected to the internal combustion engine and the second-stage compressor, and the second-stage compressor is connected to the internal combustion engine through the second-stage intercooler.

3. A compound supercharging system for improving transient response performance of an internal combustion engine as claimed in claim 2, characterized in that: The first-stage intercooler, the first-stage compressor, the second-stage compressor, the second-stage intercooler, and the internal combustion engine are connected in sequence through an intake main line, and a compressor three-way valve is provided between the first-stage intercooler and the second-stage compressor; the first-stage compressor, the first-stage intercooler, and the internal combustion engine are connected in sequence through an intake bypass line, and a first-stage compressor bypass valve is provided between the first-stage intercooler and the internal combustion engine.

4. A compound supercharging system for improving transient response performance of an internal combustion engine as claimed in claim 3, characterized in that: The compressor three-way valve includes a first port A, a first port B, and a first port C, wherein the first port A is connected to the first-stage compressor, the first port B is connected to the second-stage compressor, and the first port C is connected to the atmosphere.

5. The compound supercharging system for improving transient response performance of an internal combustion engine according to claim 1, characterized in that: The internal combustion engine is connected to the first-stage turbine and the second-stage turbine through an exhaust pipe; the exhaust pipe includes an exhaust main pipe and an exhaust bypass pipe, the internal combustion engine, the second-stage turbine, and the first-stage turbine are connected in sequence through the exhaust main pipe, and the internal combustion engine and the first-stage turbine are connected in sequence through the exhaust bypass pipe.

6. A compound supercharging system for improving transient response performance of an internal combustion engine as claimed in claim 5, characterized in that: A secondary turbine bypass valve is provided on the exhaust bypass line between the internal combustion engine and the primary turbine; a turbine three-way valve is provided on the exhaust main line between the secondary turbine and the primary turbine, and the turbine three-way valve includes a second A port, a second B port, and a second C port, wherein the second A port is connected to the secondary turbine, the second B port is connected to the primary turbine, and the second C port is connected to the atmosphere.

7. A compound supercharging system for improving transient response performance of an internal combustion engine as claimed in claim 6, characterized in that: The turbine three-way valve, the compressor three-way valve, the first-stage compressor bypass valve, and the second-stage turbine bypass valve are all solenoid valves and are all connected to the controller.

8. A method for operating a compound supercharging system for improving transient response performance of an internal combustion engine according to any one of claims 1 to 7, characterized in that: include: When the internal combustion engine is in a low-speed, low-torque operating condition, the first A port and the first B port of the compressor three-way valve are controlled to open, the first C port is closed, the first-stage compressor bypass valve is closed, the second A port and the second B port of the turbine three-way valve are opened, the second C port is closed, and the second-stage turbine bypass valve is closed; at the same time, the clutch in the mechanical transmission system is controlled to be disengaged, so that the crankshaft is disconnected from the first supercharger shaft and the second supercharger shaft; When the internal combustion engine is in a high-speed, high-torque operating condition, the first A port of the compressor three-way valve is controlled to be closed, the first B port and the first C port are opened, the first-stage compressor bypass valve is opened, the second A port and the second C port of the turbine three-way valve are opened, the second B port is closed, and the second-stage turbine bypass valve is opened; at the same time, the clutch in the mechanical transmission system is controlled to engage, so that the crankshaft is connected to the first supercharger shaft and the second supercharger shaft.

9. The method for operating a compound supercharging system for improving transient response performance of an internal combustion engine according to claim 8, characterized in that: When the clutch is engaged and the speed of the internal combustion engine is too high, the planetary gear ratio is adjusted so that the output shaft speed of the planetary gear is lower than the speed of the first supercharger shaft and the second supercharger shaft, thereby converting the unused waste heat energy in the turbine into mechanical energy and outputting it to the crankshaft.

10. The method for operating a compound supercharging system for improving transient response performance of an internal combustion engine according to claim 8, characterized in that: When the clutch is engaged, when the load in the internal combustion engine increases or the engine is in an acceleration condition, the planetary gear ratio is adjusted so that the output shaft speed of the planetary gear is greater than the speed of the first supercharger shaft and the second supercharger shaft, thereby increasing the compressor speed and the air supply.

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