supercharging system

Abstract

A supercharging system includes a supercharger including a compressor and a turbine coupled to the compressor via a rotating shaft, a pressure sensor configured to measure an inlet pressure of the compressor, and a surge detection unit configured to detect occurrence of a surge of the compressor based on the inlet pressure of the compressor measured by the pressure sensor.

Description

Technical Field

[0001] This invention relates to a booster system.

[0002] This application claims priority based on Japanese Patent Application No. 2024-060416 filed with the Japan Patent Office on April 3, 2024, the contents of which are incorporated herein by reference. Background Technology

[0003] Patent Document 1 discloses a method for suppressing turbocharger overspeed, which involves monitoring the turbocharger's rotational speed and opening the exhaust valve when the speed exceeds a threshold.

[0004] Previous technical documents Patent documents Patent Document 1: Japanese Utility Model Application Publication No. 62-176442 Summary of the Invention

[0005] The technical problem to be solved by the invention In the method described in Patent Document 1, for example, when compressor surge occurs in the high-speed range of the engine or when surge occurs in one of multiple turbochargers, the turbocharger speed increases instantaneously. Therefore, there is a concern that the exhaust valve cannot be opened in time, leading to turbocharger overspeed. Therefore, in order to suppress turbocharger overspeed, it is necessary to detect compressor surge as a precursor to turbocharger overspeed at an early stage.

[0006] In view of the above, at least one embodiment of the present invention aims to provide a booster system capable of detecting early occurrence of compressor surge in a booster.

[0007] means for solving technical problems To achieve the above objectives, at least one embodiment of the booster system according to the present invention comprises: A turbocharger, comprising a compressor and a turbine connected to the compressor via a rotating shaft; A pressure sensor is used to measure the inlet pressure of the compressor; and The surge detection unit is configured to detect the occurrence of surge in the compressor based on the inlet pressure of the compressor measured by the pressure sensor.

[0008] Invention Effects According to at least one embodiment of the present invention, a booster system is provided that is capable of early detection of the occurrence of compressor surge in a booster. Attached Figure Description

[0009] Figure 1This is a schematic diagram illustrating the structure of a booster system 2 according to one embodiment of the present invention.

[0010] Figure 2 This is a schematic cross-sectional view showing a portion of the cross section along the axial direction in the turbocharger 10.

[0011] Figure 3 This is a diagram illustrating an example of the hardware structure of the control device 22.

[0012] Figure 4 This is a block diagram illustrating an example of the functional structure of the control device 22.

[0013] Figure 5 This is a diagram illustrating an example of the control flow of control device 22.

[0014] Figure 6 This is a diagram showing the airflow when compressor 24 experiences surge.

[0015] Figure 7 This means that no boosting is performed in boosting system 2. Figure 5 The graph shows an example of the time-dependent changes in the rotational speed of the booster 10 and the inlet pressure P under the control conditions shown.

[0016] Figure 8 This means that no boosting is performed in boosting system 2. Figure 5 Under the control conditions shown, with Figure 7 The graph shows the time-varying speed and inlet pressure rate dP / dt of the booster 10 during the same period.

[0017] Figure 9 The figure shows another example of the arrangement of the pressure sensor 52, and is a schematic cross-sectional view showing a portion of a section along the axial direction in the booster 10.

[0018] Figure 10 The figure shows another example of the arrangement of the pressure sensor 52, and is a schematic cross-sectional view showing a portion of a section along the axial direction in the booster 10. Detailed Implementation

[0019] Hereinafter, some embodiments of the present invention will be described with reference to the accompanying drawings. The dimensions, materials, shapes, and relative arrangements of the constituent components described or illustrated as embodiments are not intended to limit the scope of the invention, but are merely illustrative examples.

[0020] For example, expressions such as "in a certain direction", "along a certain direction", "parallel", "orthogonal", "center", "concentric" or "coaxial" indicate relative or absolute configuration. They not only indicate such configuration in a strict sense, but also indicate a state of relative displacement by angle or distance with tolerance or to the extent that the same function can be obtained.

[0021] For example, expressions such as "same," "identical," and "homogeneous" that indicate things are in the same state not only indicate the same state in a strict sense, but also indicate the state where there are differences in tolerance or degree to which the same function can be obtained.

[0022] For example, descriptions of shapes such as quadrilaterals and cylinders not only refer to quadrilaterals and cylinders in a strict geometric sense, but also include shapes with concave and convex parts, chamfers, etc., within the range where the same effect can be obtained.

[0023] On the other hand, the expression "possessing," "having," "including," "containing," or "having" a constituent element is not an exclusive expression that excludes the existence of other constituent elements.

[0024] Figure 1 This is a schematic diagram illustrating the structure of a booster system 2 according to one embodiment of the present invention.

[0025] like Figure 1 As shown, the supercharging system 2 includes an engine 4, an air supply line 6, an exhaust line 8, a supercharger 10, an air bypass line 14, an air bypass valve 16, an exhaust valve line 18, an exhaust valve 20, and a control device 22.

[0026] Engine 4 uses air (compressed air) supplied from air supply line 6 to burn fuel and discharges the resulting combustion gases as exhaust gas to exhaust line 8.

[0027] The turbocharger 10 includes a compressor 24 disposed in the air supply line 6, a turbine 26 disposed in the exhaust line 8, and a rotating shaft 28 connecting the compressor 24 and the turbine 26.

[0028] Compressor 24 is a centrifugal compressor that compresses air to generate compressed air and supplies the compressed air to engine 4 via air supply line 6. Exhaust gas discharged from engine 4 is supplied to turbine 26 via exhaust line 8 to drive turbine 26. The rotation of turbine 26 is transmitted to compressor 24 via rotating shaft 28, and compressor 24 compresses air.

[0029] An air bypass line 14 branches off from the air supply line 6 and is configured to release a portion of the air flowing through the air supply line 6 from the air supply line 6 instead of supplying it to the engine 4. The air bypass line 14 can be configured to release a portion of the air, for example, from the air supply line 6 to the atmosphere. An air bypass valve 16 is provided on the air bypass line 14; if the air bypass valve 16 is opened, a portion of the air flowing through the air supply line 6 is released from the air bypass line 14 instead of supplying it to the engine 4.

[0030] The exhaust valve line 18 branches off from the upstream side of the turbine 26 in the exhaust line 8, bypasses the turbine 26, and connects to the downstream side of the turbine 26 in the exhaust line 8. The exhaust valve 20 is provided in the exhaust valve line 18. When the exhaust valve 20 is opened, a portion of the air flowing through the exhaust line 8 is supplied to the downstream side of the turbine 26 in the exhaust line 8 through the exhaust valve line 18 (i.e., bypassing the turbine 26).

[0031] The control device 22 is configured to control the engine 4 and control the valve opening of the air bypass valve 16 and the valve opening of the exhaust valve 20.

[0032] Figure 2 This is a schematic cross-sectional view showing a portion of the axial section of the aforementioned supercharger 10.

[0033] like Figure 2 As shown, the booster 10 includes a silencer 30 disposed at the inlet 24a of the compressor 24. The compressor 24 includes an impeller 32 and a compressor housing 34 that houses the impeller 32. In the illustrated exemplary embodiment, the compressor housing 34 includes a generally cylindrical air guide tube 36 that houses the impeller 32 and a vortex housing 40 that forms a vortex flow path 38 on the outer peripheral side of the impeller 32. The flange 31 formed in the silencer 30 and the flange 37 formed in the air guide tube 36 are fastened by a plurality of bolts 41 (a plurality of fastening components).

[0034] exist Figure 2 In the exemplary embodiment shown, the muffler 30 includes: a first sidewall 42 in the shape of a circular plate (the outer wall of the muffler 30) extending in a direction orthogonal to the rotation axis O of the impeller 32; a second sidewall 46 in the shape of an annular ring disposed between the first sidewall 42 and the compressor 24 around the rotation axis O of the impeller 32, and forming an external air inlet space 44 (the internal space of the muffler 30) between the second sidewall 42 and the compressor 24 for guiding external air (air) into the interior of the air guide tube 36; and an annular flange 31 disposed on the second sidewall 46.

[0035] like Figure 2As shown, the muffler 30 includes at least one muffler element 48 disposed in the external air intake space 44. In the illustrated example, the muffler 30 includes: a muffler element 48 disposed along the inner surface of the first sidewall 42; an annular muffler element 48 disposed along the inner surface of the second sidewall 46; and a plurality of annular muffler elements 48 disposed at intervals between the first sidewall 42 and the second sidewall 46 along the rotation axis O. Furthermore, bolts 90 are provided at multiple circumferential locations, passing through the first sidewall 42, each of the aforementioned muffler elements 48, the second sidewall 46, and the flange 31 along the rotation axis O; and nuts 91 fastened to the bolts 90.

[0036] exist Figure 2 In the supercharger 10 shown, if the impeller 32 of the compressor 24 rotates, external air is introduced from the outer peripheral side of the silencer 30 into the external air inlet space 44. The flow of external air introduced into the external air inlet space 44, after passing through the silencer element 48, turns in the direction of the rotation axis O and passes through the inner peripheral side of the annular second sidewall 46, and is guided to the air guide tube 36.

[0037] exist Figure 2 In the illustrated embodiment, the muffler 30 includes: a cleaning nozzle 50 for spraying cleaning fluid; and a pressure sensor 52 connected to the cleaning nozzle 50 via a cylindrical connector 51 serving as a connecting member. The cleaning nozzle 50 is mounted in a through hole 54 (nozzle insertion hole) formed in the first sidewall 42, and the front end 50a of the cleaning nozzle 50 is inserted through the through hole 54 and disposed in the external air inlet space 44 (internal space of the muffler 30). In the illustrated example, the front end 50a of the cleaning nozzle 50 is disposed on the rotation axis O of the impeller 32 such that it sprays cleaning fluid onto the impeller 32. One end of the connector 51 is connected (fitted) to the base end 50b of the cleaning nozzle 50, and the pressure sensor 52 is connected (fitted) to the other end of the connector 51. That is, the pressure sensor 52 is mounted in the through hole 54 via the connector 51 and the cleaning nozzle 50. In this configuration, the internal space 51s of connector 51 is connected to the external air inlet space 44 of muffler 30 via the internal space 50s of cleaning nozzle 50 (the nozzle flow path of cleaning nozzle 50), and pressure sensor 52 faces the internal space 51s of connector 51. Furthermore, in this configuration, pressure sensor 52 measures the pressure in the internal space 51s of connector 51, i.e., the pressure in the external air inlet space 44 of muffler 30, as the inlet pressure P of compressor 24. Additionally, the inlet pressure P of compressor 24 measured by pressure sensor 52 can be either the pressure difference with atmospheric pressure (gauge pressure) or absolute pressure.

[0038] Figure 3 This is a diagram illustrating an example of the hardware structure of the control device 22. Figure 4 This is a block diagram illustrating an example of the functional structure of the control device 22. Figure 5 This is a diagram illustrating an example of the control flow of control device 22.

[0039] like Figure 3 As shown, the control device 22 is constructed using a computer that includes, for example, a processor 72, RAM (Random Access Memory) 74, ROM (Read Only Memory) 76, HDD (Hard Disk Drive) 78, input I / F 80, and output I / F 82, all interconnected via a bus 84. The control device 22 is constructed by the computer executing programs that implement the various functions of the control device 22. The functions of each component in the control device 22, as described below, are implemented for example: loading the program stored in ROM 76 into RAM 74 for execution by the processor 72, and reading and writing data from RAM 74 and ROM 76. The hardware constituting the control device 22 can be concentrated in one location or distributed across multiple locations.

[0040] like Figure 4 As shown, the control device 22 includes: a surge detection unit 60, an engine control unit 62, an air bypass valve control unit 64, and an exhaust valve control unit 66. The surge detection unit 60 includes an inlet pressure change rate calculation unit 68. Hereinafter, it will be used... Figure 5 The functions of each part of the control device 22 will be explained.

[0041] like Figure 5 As shown, in S101, the surge detection unit 60 sequentially acquires the inlet pressure P of the compressor 24, which is measured by the pressure sensor 52 at all times. In S102, the inlet pressure change rate calculation unit 68 sequentially calculates the time change rate of the inlet pressure P, i.e., the inlet pressure change rate dP / dt. Here, the inlet pressure change rate dP / dt refers to the change in inlet pressure P per unit time, i.e., the time derivative of the inlet pressure P.

[0042] In S103, the surge detection unit 60 compares the inlet pressure change rate dP / dt calculated by the inlet pressure change rate calculation unit 68 with the threshold Th, and determines whether the inlet pressure change rate dP / dt is lower than the threshold Th. In S103, if the surge detection unit 60 determines that the inlet pressure change rate dP / dt calculated by the inlet pressure change rate calculation unit 68 is lower than the threshold Th, the surge detection unit 60 detects a sign of over-rotation of the booster 10, i.e., the occurrence of surge in the compressor 24 (i.e., determines that the compressor 24 has experienced surge), and proceeds to S104.

[0043] In S103, if the surge detection unit 60 determines that the inlet pressure change rate dP / dt calculated by the inlet pressure change rate calculation unit 68 is not lower than the threshold Th, the surge detection unit 60 does not detect the occurrence of surge in the compressor 24 (i.e., it determines that the compressor 24 has not experienced surge) and returns to S101.

[0044] In S104, control device 22 performs control to suppress the increase in the speed of turbocharger 10. In S104, as control to suppress the increase in the speed of turbocharger 10, control device 22 can, for example, reduce the load on engine 4 via engine control unit 62, or stop the operation of engine 4 via engine control unit 62. Here, reducing the load on engine 4 can, for example, be control to reduce the fuel flow rate of engine 4. In S104, as control to suppress the increase in the speed of turbocharger 10, control device 22 can, for example, increase the valve opening of air bypass valve 16 via air bypass valve control unit 64. In S104, as control to suppress the increase in the speed of turbocharger 10, control device 22 can, for example, increase the valve opening of exhaust valve 20 via exhaust valve control unit 66. Furthermore, in S104, the control device 22 can combine and execute any multiple controls among the control to reduce the load on the engine 4, the control to increase the valve opening of the air bypass valve 16, and the control to increase the valve opening of the exhaust valve 20 as controls to suppress the increase in the speed of the turbocharger 10.

[0045] Here, use Figures 6-8 The relationship between the surge of the compressor 24 in the booster 10 and the aforementioned inlet pressure P and the aforementioned inlet pressure change rate dP / dt is explained.

[0046] Figure 6 This is a diagram showing the airflow when compressor 24 experiences surge. (Example) Figure 6 As shown, when compressor 24 experiences surge, compressed air flows backward from the downstream side of compressor 24 in air supply line 6 toward the suction side of silencer 30.

[0047] Figure 7 This means that no boosting is performed in boosting system 2. Figure 5 The graph shows an example of the time-dependent changes in the rotational speed of the booster 10 and the aforementioned inlet pressure P under the control conditions shown. Figure 8 This means that no boosting is performed in boosting system 2. Figure 5 Under the control conditions shown, with Figure 7 The graph shows the time-varying rotational speed of the booster 10 and the aforementioned inlet pressure change rate dP / dt during the same period.

[0048] exist Figure 7 and Figure 8In the example shown, at time t1, surge occurs in the compressor 24 of the booster 10. Immediately after the surge, the compressed air flowing backward to the outlet side of the impeller 32 of the compressor 24 impedes the rotation of the impeller 32. Therefore, as shown by arrow a1, the rotational speed of the booster 10 temporarily decreases. However, during the subsequent period when the airflow resumes from backward to forward flow, the compression work of the impeller 32 decreases, and therefore, as shown by arrow a2, the rotational speed of the booster 10 increases sharply. On the other hand, it can be confirmed that the inlet pressure P and the rate of change of inlet pressure dP / dt change significantly in the negative direction immediately after the surge occurs.

[0049] Therefore, as with the supercharger system 2 described above, by providing a surge detection unit 60 configured to detect the occurrence of surge in the compressor 24 based on the inlet pressure P of the compressor 24, surge in the compressor 24 in the supercharger 10 can be detected at an early stage. Furthermore, although the inlet pressure P changes according to the rotational speed of the supercharger 10, the surge detection unit 60 detects the occurrence of surge in the compressor 24 when the inlet pressure change rate dP / dt is below the threshold Th. Therefore, even when the inlet pressure P changes due to the rotational speed of the supercharger 10, the occurrence of surge in the compressor 24 can be detected early and with high accuracy, suppressing false detections of surge. Moreover, when the surge detection unit 60 detects surge in the compressor 24, by controlling the increase in the rotational speed of the supercharger 10 (reducing the load on the engine 4 or stopping the engine 4, increasing the opening of the air bypass valve 16, or increasing the opening of the exhaust valve 20), overspeed of the supercharger 10 can be suppressed.

[0050] Figure 9 This is another example of how the pressure sensor 52 is installed, and a schematic cross-sectional view showing a portion of a section along the axial direction in the booster 10. Figure 9 In the embodiments shown, unless otherwise specified, they are consistent with... Figure 2 The symbols used in the embodiments shown are the same as those used in the implementation. Figure 2 The structures shown in the embodiments are identical, and the description is omitted.

[0051] In some implementations, for example, such as Figure 9As shown, a flexible hose 53, serving as a connecting component, is connected (fitted) to one end of the base 50b of the cleaning nozzle 50, and a pressure sensor 52 is connected (fitted) to the other end of the flexible hose 53. That is, the pressure sensor 52 is installed in the through hole 54 of the first sidewall 42 of the muffler 30 via the flexible hose 53 and the cleaning nozzle 50. In this case, the internal space 53s of the flexible hose 53 communicates with the external air inlet space 44 of the muffler 30 via the internal space 50s of the cleaning nozzle 50 (the nozzle flow path of the cleaning nozzle 50), and the pressure sensor 52 faces the internal space 53s of the flexible hose 53. Furthermore, in this case, the pressure sensor 52 measures the pressure in the internal space 53s of the flexible hose 53, i.e., the pressure in the external air inlet space 44 of the muffler 30, as the inlet pressure P of the compressor 24.

[0052] Figure 10 This is another example of the arrangement of the pressure sensor 52, and a schematic cross-sectional view showing a portion of a section along the axial direction in the booster 10. Figure 10 In the embodiments shown, unless otherwise specified, they are consistent with... Figure 2 The symbols used in the embodiments shown are the same as those used in the implementation. Figure 2 The structures shown in the embodiments are identical, and the description is omitted.

[0053] In some implementations, for example, such as Figure 10 As shown, the pressure sensor 52 can be directly mounted in the through hole 54 of the first side wall 42 of the muffler 30. For example, a cleaning nozzle 50 is installed in the through hole 54 (cleaning nozzle insertion hole) (see reference). Figure 2 In the case of removing the cleaning nozzle 50 from the through-hole 54, the pressure sensor 52 can be installed in the through-hole 54. Figure 10 In the embodiment shown, the pressure sensor 52 is located upstream of the inlet 24a of the air guide tube 36 in the direction of air flow, facing the external air inlet space 44 of the muffler 30, and measures the pressure of the external air inlet space 44 of the muffler 30 as the inlet pressure P of the compressor 24.

[0054] exist Figure 9 The implementation methods shown are as follows: Figure 10In the illustrated embodiment, by including a surge detection unit 60 configured to detect the occurrence of surge in the compressor 24 based on the inlet pressure P of the compressor 24, surge in the compressor 24 in the turbocharger 10 can be detected at an early stage. Furthermore, by detecting the occurrence of surge in the compressor 24 when the inlet pressure change rate dP / dt is below the threshold Th, the occurrence of surge in the compressor 24 can be detected early and with high accuracy even when the inlet pressure P changes due to the rotational speed of the turbocharger 10, thus suppressing false detections of surge. Moreover, when the surge detection unit 60 detects surge in the compressor 24, by controlling the increase in the rotational speed of the turbocharger 10 (reducing the load on the engine 4 or stopping the engine 4, increasing the opening of the air bypass valve 16, or increasing the opening of the exhaust valve 20), overspeed of the turbocharger 10 can be suppressed.

[0055] The present invention is not limited to the above-described embodiments, but also includes modifications to the above-described embodiments or appropriate combinations thereof.

[0056] For example, in some embodiments, the surge detection unit 60 can detect the occurrence of surge when the inlet pressure P of the compressor 24 is lower than a threshold. In this case, the threshold can be changed according to the rotational speed of the booster 10.

[0057] Furthermore, in the above embodiment, a booster 10 equipped with a muffler 30 was exemplified, but the booster of the present invention may not have a muffler. In this case, the pressure sensor 52 may be provided at the inlet of the air guide tube 36 of the compressor 24, or it may be provided on the piping if there is piping upstream of the air guide tube 36 of the compressor 24.

[0058] The contents described in the above embodiments can be understood as follows, for example.

[0059] [1] The supercharging system (e.g., the supercharging system 2 described above) according to at least one embodiment of the present invention comprises: A turbocharger (e.g., turbocharger 10 described above) includes a compressor (e.g., compressor 24 described above) and a turbine (e.g., turbine 26 described above) connected to the compressor via a rotating shaft. A pressure sensor (e.g., pressure sensor 52 described above) is used to measure the inlet pressure of the compressor (e.g., inlet pressure P described above); and The surge detection unit (e.g., the surge detection unit 60 described above) is configured to detect the occurrence of surge in the compressor based on the inlet pressure (e.g., the inlet pressure P described above) of the compressor measured by the pressure sensor.

[0060] According to the supercharging system described above [1], in the event of compressor surge, which is a precursor to supercharger overspeed, the occurrence of the surge can be detected early based on the compressor inlet pressure. Therefore, in the event of the surge, for example by controlling the supercharger speed to suppress the increase, the occurrence of supercharger overspeed can be suppressed.

[0061] [2] In some embodiments, in the booster system described in [1] above, The surge detection unit includes an inlet pressure change rate calculation unit (e.g., the inlet pressure change rate calculation unit 68) configured to calculate the time change rate of the inlet pressure, i.e., the inlet pressure change rate (e.g., the inlet pressure change rate dP / dt). The surge detection unit is configured to detect the occurrence of surge in the compressor when the inlet pressure change rate calculated by the inlet pressure change rate calculation unit is lower than a threshold (e.g., the aforementioned threshold Th).

[0062] The compressor inlet pressure varies depending on the speed of the booster. However, according to the booster system described above [2], even if the inlet pressure varies due to the speed of the booster, the occurrence of compressor surge can be detected early and with high accuracy, thereby suppressing false detection of surge.

[0063] [3] In some embodiments, the booster system described in [1] or [2] above further includes: A silencer (e.g., silencer 30 described above) is installed at the inlet of the compressor. The pressure sensor is configured to face the interior space of the muffler (e.g., the external gas inlet space 44) or a space communicating with the interior space of the muffler (e.g., the interior space 51s of the connector 51 or the interior space 53s of the hose 53).

[0064] According to the booster system described above [3], for example, compared with the case where a pressure sensor is installed on the compressor, the influence on the airflow inside the compressor can be reduced, thereby suppressing the reduction in compressor efficiency.

[0065] [4] In some embodiments, in the booster system described in [3] above, A through hole (e.g., the aforementioned through hole 54) is formed on the outer wall of the muffler. The pressure sensor is installed in the through hole on the outer wall of the muffler.

[0066] According to the booster system described above [4], compared with the case where a pressure sensor is installed on the compressor, the impact on the airflow inside the compressor can be reduced, thereby suppressing the reduction in compressor efficiency.

[0067] [5] In some embodiments, in the booster system described above [4], The through hole is a nozzle insertion hole for inserting a cleaning nozzle (e.g., the cleaning nozzle 50 mentioned above) that sprays cleaning fluid.

[0068] According to the pressurization system described above [5], in addition to the effects described above [4], a pressure sensor can also be installed on the outer wall of the muffler by using the nozzle insertion hole.

[0069] [6] In some embodiments, the booster system described in [3] above further includes: A cleaning nozzle (e.g., the cleaning nozzle 50 described above) is used to spray cleaning fluid into the interior of the compressor. A through hole (e.g., the through hole 54) is formed on the outer wall of the muffler (e.g., the first side wall 42 mentioned above). The cleaning nozzle is inserted through the through hole in the outer wall of the silencer. The pressure sensor is connected to the cleaning nozzle.

[0070] According to the pressurization system described above [6], the pressure sensor described above [3] can be installed without disassembling the cleaning nozzle.

[0071] [7] In some embodiments, the booster system described in any one of [1] to [6] above further comprises: An engine control unit (e.g., the engine control unit 62 described above, for controlling the engine connected to the turbocharger) If the surge detection unit detects the occurrence of surge in the compressor, the engine control unit is configured to reduce the load on the engine or stop the engine.

[0072] According to the supercharging system described above [7], in the event of a precursor to supercharger overspeed, i.e. compressor surge, the surge can be detected early, thereby reducing the engine load or stopping the engine, thus suppressing the occurrence of supercharger overspeed.

[0073] [8] In some embodiments, the booster system described in any one of [1] to [7] above further comprises: An air supply line (e.g., air supply line 6 described above) supplies air from the compressor to the engine; An air bypass valve (e.g., the air bypass valve 16 described above) is used to release a portion of the air from the air supply line from the air supply line instead of supplying it to the engine; and The air bypass valve control unit (for example, the air bypass valve control unit 64 described above) is configured to increase the valve opening of the air bypass valve when the surge detection unit detects the occurrence of surge in the compressor.

[0074] According to the supercharging system described above [8], in the event of a precursor to supercharger overspeed, i.e. compressor surge, the surge can be detected early and a portion of the air is released from the engine instead of being supplied, thus suppressing the occurrence of supercharger overspeed.

[0075] [9] In some embodiments, the booster system described in any one of [1] to [8] above further comprises: An exhaust pipe (e.g., exhaust pipe 8 described above) supplies exhaust gas from the engine to the turbine; The exhaust valve line (e.g., the exhaust valve line 18 described above) branches off from the upstream side of the turbine in the exhaust line and connects to the downstream side of the turbine in the exhaust line. An exhaust valve (e.g., the exhaust valve 20 described above) is provided in the exhaust valve pipeline; and The exhaust valve control unit (for example, the exhaust valve control unit 66 described above) is configured to increase the valve opening of the exhaust valve when the surge detection unit detects the occurrence of surge in the compressor.

[0076] According to the supercharging system described above [9], in the event of a precursor to supercharger overspeed, i.e. compressor surge, the surge can be detected early and the supply of exhaust gas to the turbine can be reduced, thereby suppressing the occurrence of supercharger overspeed.

[0077] Symbol Explanation 2-Supercharging system, 4-Engine, 6-Air supply line, 8-Exhaust line, 10-Supercharger, 14-Air bypass line, 16-Air bypass valve, 18-Waste gas valve line, 20-Waste gas valve, 22-Control device, 24-Compressor, 24a-Inlet, 26-Turbine, 28-Rotating shaft, 30-Muffler, 31, 37-Flanges, 32-Impeller, 34-Compressor housing, 36-Air guide tube, 38-Vortex flow path, 40-Vortex housing, 41-Bolt, 42-First sidewall, 44-External gas inlet space, 46-Second sidewall, 48-Muffler element, 50-Cleaning nozzle 50a - Front end, 50b - Base end, 51 - Connector, 52 - Pressure sensor, 53 - Hoses, 54 - Through hole, 60 - Surge detection unit, 62 - Engine control unit, 64 - Air bypass valve control unit, 66 - Exhaust valve control unit, 68 - Inlet pressure change rate calculation unit, 72 - Processor, 74 - RAM, 76 - ROM, 78 - HDD, 80 - Input I / F, 82 - Output I / F, 84 - Bus, 90 - Bolt, 91 - Nut, O - Rotation axis, P - Inlet pressure, Th - Threshold, a1, a2 - Arrows, dS / dt - Inlet pressure change rate, t1 - Time.

Claims

1. A booster system, comprising: A turbocharger, comprising a compressor and a turbine connected to the compressor via a rotating shaft; A pressure sensor is used to measure the inlet pressure of the compressor; and The surge detection unit is configured to detect the occurrence of surge in the compressor based on the inlet pressure of the compressor measured by the pressure sensor.

2. The booster system according to claim 1, wherein, The surge detection unit includes an inlet pressure change rate calculation unit configured to calculate the time change rate of the inlet pressure, i.e., the inlet pressure change rate. The surge detection unit is configured to detect the occurrence of surge in the compressor when the inlet pressure change rate calculated by the inlet pressure change rate calculation unit is lower than a threshold.

3. The booster system according to claim 1, further comprising: A silencer is installed at the inlet of the compressor. The pressure sensor is configured to face the interior space of the muffler or to communicate with the interior space of the muffler.

4. The booster system according to claim 3, wherein, A through hole is formed on the outer wall of the muffler. The pressure sensor is installed in the through hole on the outer wall of the muffler.

5. The booster system according to claim 4, wherein, The through hole is a nozzle insertion hole for inserting a cleaning nozzle that sprays cleaning fluid.

6. The booster system according to claim 3, further comprising: Cleaning nozzles are used to spray cleaning fluid. A through hole is formed on the outer wall of the muffler. The cleaning nozzle is inserted through the through hole in the outer wall of the silencer. The pressure sensor is connected to the cleaning nozzle.

7. The booster system according to claim 1, further comprising: The engine control unit is used to control the engine connected to the turbocharger. If the surge detection unit detects the occurrence of surge in the compressor, the engine control unit is configured to reduce the load on the engine or stop the engine.

8. The booster system according to claim 1, further comprising: The air supply line supplies air from the compressor to the engine; An air bypass valve is used to release a portion of the air from the air supply line instead of supplying it to the engine; and The air bypass valve control unit is configured to increase the valve opening degree of the air bypass valve when the surge detection unit detects the occurrence of surge in the compressor.

9. The booster system according to claim 1, further comprising: The exhaust pipe supplies the engine's exhaust gases to the turbine; The exhaust valve line branches off from the upstream side of the turbine in the exhaust line and connects to the downstream side of the turbine in the exhaust line; An exhaust gas valve is installed in the exhaust gas valve pipeline; and The exhaust valve control unit is configured to increase the valve opening degree of the exhaust valve when the surge detection unit detects the occurrence of surge in the compressor.

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