An internal combustion engine exhaust gas recovery composite drive power generation system

Abstract

The present invention belongs to the technical field of thermal efficiency of internal combustion engines and discloses an internal combustion engine exhaust gas recovery and compound drive power generation system, comprising an internal combustion engine system, a turbine, a generator, and a load circuit. Exhaust gas discharged from the internal combustion engine system enters the turbine to drive the turbine. The turbine is coaxially connected to the generator via a one-way overrunning coupler. The internal combustion engine front end pulley belt of the internal combustion engine system is connected to the generator. The system drives the generator via a compound drive of the one-way overrunning coupler and the internal combustion engine front end pulley belt. The generator is connected to the load circuit to provide electrical energy to the load circuit. This system improves exhaust gas energy recovery power generation and reduces the mechanical work generated by the pulley generator to increase the overall thermal efficiency of the internal combustion engine, achieving the goal of energy conservation and emission reduction. The use of the original front end pulley generator facilitates layout, reduces configuration costs, and increases service life and reliability. It also reduces high-speed mechanical power consumption.

Description

Technical Field

[0001] The present invention belongs to the technical field of thermal efficiency of internal combustion engines, and in particular relates to an internal combustion engine exhaust gas recovery composite drive power generation system. Background Art

[0002] Improving the thermal efficiency of internal combustion engines is a key approach to energy conservation and emissions reduction. Currently, the thermal efficiency of internal combustion engines exceeds 50%, while the effective power output is only 46%. 29% of the heat energy is lost to friction and cooling, 7% is used to drive engine accessories (such as supercharging, intercooling, and power generation), and 18% is emitted as exhaust gas. Engineering internal combustion engines utilize waste heat from exhaust gas for secondary power generation, recovering 3-5% of the heat energy. However, due to their large size, weight, and high installation costs, this approach is difficult to apply to vehicle internal combustion engines. Therefore, a compact, lightweight, low-cost, and easy-to-install exhaust gas energy recovery system is needed to improve the overall thermal efficiency of vehicle internal combustion engines.

[0003] In the prior art, the turbine generator device provided in document CN 103670628 A (such as Figure 1 As shown in the figure), although the existing technology can achieve a certain energy-saving effect, it has the following shortcomings:

[0004] Difficulty in layout: It is necessary to find a layout position on the internal combustion engine, but it is difficult to find such space on the internal combustion engines of existing vehicles.

[0005] Low utilization rate: Under low speed and low load conditions, the internal combustion engine does not remove enough exhaust gas and the turbine generator device is in an inoperative state.

[0006] High cost: The independent turbine generator unit is expensive, and coupled with the cost of arranging accessories, the payback period is long, making it difficult for customers to accept.

[0007] Reliability needs to be verified: This new type of generator has not been used in the market, and its reliability has been verified by the market. Summary of the Invention

[0008] The purpose of the present invention is to provide an internal combustion engine exhaust gas recovery compound drive power generation system to solve the above technical problems.

[0009] To solve the above technical problems, the specific technical solution of the internal combustion engine exhaust gas recovery hybrid drive power generation system of the present invention is as follows:

[0010] An internal combustion engine exhaust gas recovery composite drive power generation system includes an internal combustion engine system, a turbine, a generator and a load circuit. The exhaust gas discharged by the internal combustion engine system enters the turbine to drive the turbine. The turbine is coaxially connected to the generator through a one-way overrunning coupler. The internal combustion engine front end pulley belt of the internal combustion engine system is connected to the generator. The system drives the generator through the one-way overrunning coupler and the internal combustion engine front end pulley belt. The generator is connected to the load circuit to provide electrical energy to the load circuit.

[0011] Furthermore, the internal combustion engine system includes a compressor, an intercooler, an internal combustion engine, a turbocharger bypass valve, a turbine generator bypass valve and an exhaust gas after-processor. Air g1 is input from the air inlet of the compressor, processed by the compressor into compressed air g2, and then enters the intercooler. The intercooler outputs cooling air g3 and enters the internal combustion engine. The internal combustion engine outputs combustion exhaust gas g4 and is divided into two paths. One path of combustion exhaust gas g4 enters the compressor, and the other path of bypass exhaust gas g5 is divided into two paths after passing through the turbocharger bypass valve, one path is exhaust gas g6 entering the turbine, and the other path is exhaust gas g7 entering the bypass valve. The exhaust gas g6 entering the turbine is input into the turbine for driving the turbine, and the turbine outputs turbine exhaust gas g8; the exhaust gas g7 entering the bypass valve passes through the turbine generator bypass valve and enters the exhaust gas after-processor together with the turbine exhaust gas g8 output by the turbine. The exhaust gas after-processor outputs exhaust gas g9.

[0012] Furthermore, the turbine drive, belt drive or compound drive is adjusted through the turbine generator bypass valve according to the amount of exhaust gas discharged.

[0013] Furthermore, the internal combustion engine includes a front end gear train, which includes a crankshaft pulley, an air conditioning pulley, a water pump pulley, a tensioner pulley and a belt, and the generator is driven by the belt of the front end gear train of the internal combustion engine.

[0014] Furthermore, the turbine includes a turbine rear cover, turbine blades, a turbine shaft, a turbine bearing, a turbine casing, and a connecting piece; the turbine blades are coaxially fixedly connected to the turbine shaft, the turbine rear cover is connected to the turbine shaft through the turbine bearing, the turbine casing is fixedly connected to the front end of the turbine rear cover, and the rear end of the turbine rear cover is rigidly fixedly connected to the front end cover of the generator through a connecting piece.

[0015] Furthermore, the generator includes a generator front cover, a generator front bearing, a generator stator, a generator front rotor, a generator rear cover, a generator rear bearing, a generator pole claw, a generator front bearing pressure cover, and a generator shaft.

[0016] Furthermore, the one-way overrunning coupler includes a pulley housing, a one-way device outer ring, a one-way device inner ring, a one-way device needle roller; a sealing ring, a coupler core shaft and a coupler ball bearing, the belt is arranged on the one-way device outer ring, inside the pulley housing, the one-way device needle roller forms a wedge angle with the one-way device outer ring at the axial groove on the outer periphery of the one-way device inner ring, the pulley rotates in the direction in which the wedge angle becomes smaller to drive the coupler core shaft to rotate, and rotates in the direction in which the wedge angle becomes larger to cause the coupler core shaft to overrun and slip, the inner wall of the one-way overrunning coupler has a turbine shaft connection thread and a generator shaft connection thread; the turbine shaft connection thread is connected to the turbine shaft thread, and the generator shaft connection thread is connected to the generator shaft.

[0017] Furthermore, the turbine generator bypass valve includes a bypass valve control unit, a bypass valve housing, a bypass valve actuator, a bypass valve connecting rod, a bypass valve butterfly valve and a bypass valve valve shaft. After the bypass valve control unit issues an instruction, the bypass valve actuator executes an action, pushing or pulling the bypass valve connecting rod, and the bypass valve butterfly valve rotates around the bypass valve valve shaft as the axis to open or close the turbine generator bypass valve.

[0018] Furthermore, the turbine generator bypass valve is a stroke valve or a rotary butterfly valve. The bypass valve control unit gives a signal according to the internal combustion engine speed, internal combustion engine load, exhaust gas temperature and pressure, and pushes the bypass valve connecting rod through the bypass valve actuator. The bypass valve connecting rod pushes the rotary butterfly valve to rotate through the lever and the shaft to adjust the amount of exhaust gas entering the turbine.

[0019] Furthermore, the opening and closing of the turbine generator bypass valve is determined by the output power of the internal combustion engine and the power generated by the generator; the control strategy of the bypass valve control unit of the turbine generator bypass valve depends on the ratio of exhaust gas discharged by the internal combustion engine to the exhaust gas required to drive the generator, and the opening ratio of the turbine generator bypass valve decreases as the driving exhaust gas ratio decreases, so that the driving speed of the turbine does not exceed 10% of the belt drive speed.

[0020] The exhaust gas recovery and composite drive power generation system of an internal combustion engine of the present invention has the following advantages: on the one hand, the exhaust gas recovery and composite drive power generation system of an internal combustion engine of the present invention improves the exhaust gas energy recovery power generation and reduces the mechanical power generation of the wheel train generator to increase the comprehensive thermal efficiency of the internal combustion engine and achieve the purpose of energy conservation and emission reduction; on the other hand, the use of the original front-end wheel train generator makes the layout easy and the configuration cost low, so that users can obtain benefits in a shorter time; at the same time, due to the reduction of the mechanical power consumption of the front-end wheel train generator of the internal combustion engine, the service life and reliability of the front-end wheel train of the internal combustion engine can be improved; since the original front-end wheel train generator is used, its reliability has been verified, and due to the composite action of the belt and the turbine, the mechanical load of the front-end wheel train is reduced, which is conducive to improving the reliability of the front-end wheel train; the turbine drive speed is controlled to within 10% of the belt drive speed, but not limited to 10%, which is conducive to reducing high-speed mechanical power consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is an independent turbine generator device in the prior art.

[0022] Figure 2 It is a schematic diagram of the layout of an internal combustion engine exhaust gas recovery composite drive power generation system in an embodiment of the present invention.

[0023] Figure 3 Schematic diagram of the arrangement of a belt and turbine compound drive generator in the front end gear train of an internal combustion engine according to an embodiment of the present invention.

[0024] Figure 4 It is a structural schematic diagram of a belt and turbine compound drive generator in an embodiment of the present invention.

[0025] Figure 5 The figure is a schematic structural diagram of a one-way overrunning coupler driven by a belt and a turbine in an embodiment of the present invention.

[0026] Figure 6 Schematic diagram of the arrangement of the turbine generator bypass valve in an embodiment of the present invention.

[0027] Figure 7 This is a schematic diagram of a control strategy for an exhaust bypass valve based on the internal combustion engine load and the generator load in an embodiment of the present invention.

[0028] Figure 8 The figure is a graph showing the change in current output versus speed of a belt and turbine compound driven generator according to an embodiment of the present invention.

[0029] Figure 9 The figure is a graph showing the changes in the generated power, mechanical power consumption and generator efficiency of a belt and turbine compound driven generator as a function of the rotational speed in an embodiment of the present invention.

[0030] Explanation of the marks in the figure: 1. Internal combustion engine system; 11. Compressor; 12. Intercooler; 13. Internal combustion engine; 131. Front end gear train; 1311. Crankshaft pulley; 1312. Air conditioning pulley; 1313. Water pump pulley; 1314. Tensioner pulley; 1315. Belt; 14. Turbocharger bypass valve; 15. Turbine generator bypass valve; 151. Bypass valve control unit; 152. Bypass valve housing; 153. Bypass valve actuator; 154. Bypass valve connecting rod; 155. Bypass valve butterfly valve; 156. Bypass valve shaft; 16. Exhaust gas after-treatment device; 2. Turbine; 21. Turbine rear cover; 22. Turbine blades; 23. Turbine shaft; 24. Turbine shaft Bearing; 25. Turbine housing; 26. Connecting piece; 3. One-way overrunning coupler; 31. Pulley housing; 32. One-way coupler outer ring; 33. One-way coupler inner ring; 34. One-way coupler needle roller; 35. Sealing ring; 36. Coupler mandrel; 37. Coupler ball bearing; 38. Turbine shaft thread connection; 39. Generator shaft thread connection; 4. Generator; 41. Generator front cover; 42. Generator front bearing; 43. Generator stator; 44. Generator front rotor; 45. Generator rear cover; 46. Generator rear bearing; 47. Generator pole claw; 48. Generator front bearing gland; 49. Generator shaft; 5. Load circuit; 51. Battery; 52. Electrical load; 53. Ground wire; DETAILED DESCRIPTION

[0031] In order to better understand the purpose, structure and function of the present invention, the following is a further detailed description of an internal combustion engine exhaust gas recovery composite drive power generation system of the present invention in conjunction with the accompanying drawings.

[0032] In the prior art, turbine generators such as Figure 1 As shown, the turbine assembly consists of parts 101 to 107 and the generator consists of parts 108 to 120. The turbine shaft 103 and the generator shaft are the same part. It is not easy to find a suitable position for such a turbine generator on an internal combustion engine. The generator assembly is a new type of generator and its reliability needs to be verified.

[0033] like Figure 2 As shown, the present invention provides an internal combustion engine exhaust gas recovery hybrid drive power generation system, comprising an internal combustion engine system 1, a turbine 2, a one-way overtaking coupler 3, a generator 4 and a load circuit 5.

[0034] The exhaust gas discharged by the internal combustion engine system 1 enters the turbine 2 and is used to drive the turbine 2. The turbine 2 is coaxially connected to the generator 4 through a one-way overrunning coupler 3. The front end pulley belt of the internal combustion engine of the internal combustion engine system 1 is connected to the generator 4. The system drives the generator 4 through the one-way overrunning coupler 3 and the front end pulley belt of the internal combustion engine. The generator 4 is connected to the load circuit 5 to provide electrical energy to the load circuit 5.

[0035] Internal combustion engine system 1 includes a compressor 11, an intercooler 12, an internal combustion engine 13, a turbocharger bypass valve 14, a turbine generator bypass valve 15, and an exhaust gas aftertreatment unit 16. Air g1 enters the intake of compressor 11, is processed by compressor 11 into compressed air g2, and then enters intercooler 12. Intercooler 12 outputs cooled air g3, which enters internal combustion engine 13. Internal combustion engine 13 outputs combustion exhaust gas g4, which is then split into two paths. One path, combustion exhaust gas g4, enters compressor 11, while the other path, bypass exhaust gas g5, passes through turbocharger bypass valve 14 and splits into two paths: one path, turbine exhaust gas g6, and the other path, bypass valve exhaust gas g7. Turbine exhaust gas g6 enters turbine 2, driving turbine 2. Turbine 2 then outputs turbine exhaust gas g8. The exhaust gas g7 entering the bypass valve passes through the turbine generator bypass valve 15 and enters the exhaust gas after-processor 16 together with the turbine exhaust gas g8 output by the turbine 2. The exhaust gas after-processor 16 outputs the exhaust gas g9.

[0036] like Figure 3 As shown in the figure, which is a preferred embodiment of the present invention, the internal combustion engine 13 includes a front end gear train 131, which includes a crankshaft pulley 1311, an air conditioning pulley 1312, a water pump pulley 1313, a tensioner pulley 1314, and a belt 1315. The generator 4 is driven by the belt 1315 of the front end gear train 131 of the internal combustion engine 13.

[0037] like Figure 4 The figure shows a preferred embodiment of the present invention. The turbine 2 includes a turbine cover 21, turbine blades 22, a turbine shaft 23, a turbine bearing 24, a turbine housing 25, and a connector 26. The turbine blades 22 are coaxially and fixedly connected to the turbine shaft 23. The turbine cover 21 is connected to the turbine shaft 23 via the turbine bearing 24. The turbine housing 25 is fixedly connected to the front end of the turbine cover 21. The rear end of the turbine cover 21 is rigidly connected to the generator front cover via the connector 26.

[0038] The generator 4 includes a generator front cover 41 , a generator front bearing 42 , a generator stator 43 , a generator front rotor 44 , a generator rear cover 45 , a generator rear bearing 46 , a generator pole claw 47 , a generator front bearing pressure cover 48 , and a generator shaft 49 .

[0039] like Figure 5The figure shows a preferred embodiment of the present invention. A one-way overrunning coupler 3 driven by a belt and turbine combination includes a pulley housing 31, a one-way drive outer ring 32, a one-way drive inner ring 33, a one-way drive needle roller 34, a sealing ring 35, a coupler core shaft 36, and a coupler ball bearing 37. A belt 1315 is mounted on the one-way drive outer ring 32. Within the pulley housing 31, the one-way drive needle roller 34 forms a wedge angle with the one-way drive outer ring 32, along the axial groove on the outer periphery of the one-way drive inner ring 33. Rotation of the pulley in the direction of decreasing wedge angle drives the coupler core shaft 36, while rotation in the direction of increasing wedge angle causes the coupler core shaft 36 to overrun and slip. The inner wall of the one-way overrunning coupler 3 has threads 38 for connecting to the turbine shaft and threads 39 for connecting to the generator shaft. The threads 38 for connecting to the turbine shaft 23 are threadedly connected to the turbine shaft, while the threads 39 for connecting to the generator shaft 49 are connected to the generator shaft.

[0040] like Figure 6 FIG. 1 shows a preferred embodiment of the present invention. The load circuit 5 includes a battery 51, an electrical load 52, and a ground line 53. The generator output is connected to the battery 51 and the electrical load 52, and the negative electrodes of the battery 51 and the electrical load 52 are connected to the ground line 53. The generator output is used to charge the battery 51 and power the electrical load 52.

[0041] like Figure 6 The figure shows a preferred embodiment of the present invention. The turbine generator bypass valve 15 comprises a bypass valve control unit 151, a bypass valve housing 152, a bypass valve actuator 153, a bypass valve connecting rod 154, a bypass valve butterfly valve 155, and a bypass valve shaft 156. Upon receiving a command from the bypass valve control unit 151, the bypass valve actuator 153 actuates, pushing or pulling the bypass valve connecting rod 154. The bypass valve butterfly valve 155 rotates about the bypass valve shaft 156, thereby opening or closing the turbine generator bypass valve 15. The turbine generator bypass valve 15 can also be a travel valve or a rotary butterfly valve. Similarly, the bypass valve control unit 151 generates a signal based on the internal combustion engine speed, engine load, exhaust gas temperature, and pressure. The bypass valve actuator 153 pushes the bypass valve connecting rod 154, which in turn rotates the rotary butterfly valve via a lever and a rotating shaft to adjust the amount of exhaust gas entering the turbine.

[0042] like Figure 7 As shown in the figure, it is a preferred embodiment of the present invention. The opening and closing of the turbine generator bypass valve 15 is determined by the output power of the internal combustion engine and the power generated by the generator. The control strategy of the bypass valve control unit 151 of the turbine generator bypass valve 15 depends on the ratio of the exhaust gas discharged by the internal combustion engine to the exhaust gas required to drive the generator. Figure 7 The opening ratio of the turbine generator bypass valve 15 decreases as the driving exhaust gas ratio decreases, so that the driving speed of the turbine does not exceed 10% of the belt driving speed, but is not limited to 10%.

[0043] like Figure 8 As shown in FIG. 1 , which is a preferred embodiment of the present invention, the relationship between the current output of the generator 4 and the generator speed is shown. As can be seen from the figure, from the speed of 6000 rpm, the output current of the generator no longer increases.

[0044] like Figure 9 The diagram shows the relationship between generator 4's output power, input mechanical power consumption, and generator efficiency as a function of generator speed, according to a preferred embodiment of the present invention. As can be seen from the diagram, the generator's mechanical power consumption continues to rise above 6000 rpm. Therefore, starting at 6000 rpm, the bypass valve is raised to limit the turbine drive speed, thereby limiting the increase in generator mechanical power consumption.

[0045] In the present invention's internal combustion engine exhaust gas recovery hybrid drive power generation system, turbine 2 is coaxially connected to generator 4 via a one-way overrunning coupler 3 and supported by turbine bearing 24 and generator front bearing 42. Exhaust gas discharged from turbine generator bypass valve 15 enters turbine 2 and, through the one-way overrunning coupler 3 and the belt 1315 of the front gear train 131, drives generator 4. Generator 4 charges battery 51 and drives electrical load 52. Whether using turbine drive, belt drive, or a hybrid drive, the turbine generator bypass valve 15 can be adjusted based on the amount of exhaust gas discharged. Since the generator of the existing front-end gear train is used, the turbine is arranged at the front end, which makes the arrangement convenient and easy; at low speed and low compound, the turbine and belt compound drive the generator, reducing the generator directly consuming mechanical power from the front-end gear train, so that the overall thermal efficiency of the internal combustion engine is improved; at high speed and high load, the turbine drive speed exceeds the pulley speed driven by the front-end gear train, and the one-way overrunning coupler 3 realizes one-way overrunning, and the generator is completely driven by the turbine; when the driving speed of the turbine exceeds 10% of the belt drive speed, the bypass valve butterfly valve 155 is appropriately opened by the bypass valve control unit 151 of the turbine generator bypass valve 15 to allow part of the exhaust gas to directly enter the rear exhaust gas after-processor 16. On the one hand, this can reduce the back pressure caused by the exhaust gas on the internal combustion engine, and on the other hand, since the generator exceeds a certain speed, its power generation output no longer increases. Therefore, controlling the generator speed within a certain speed is conducive to reducing the mechanical power consumption caused by high speed.

[0046] The belt and turbine compound driven generator and internal combustion engine exhaust gas recovery and utilization system of the present invention can be applied to fields such as transportation vehicles, engineering vehicles and other power devices.

[0047] The belt and turbine compound drive generator and internal combustion engine exhaust gas recovery and utilization system, on the one hand, improves the exhaust gas energy recovery power generation, reduces the wheel train generator mechanical power generation, and improves the comprehensive thermal efficiency of the internal combustion engine by about 2%, thereby achieving the purpose of energy conservation and emission reduction; on the other hand, it can reduce the number and capacity of the internal combustion engine front end wheel train generator to reduce the configuration cost, thereby reducing or offsetting the cost increased by the turbine generator configuration, so that users can recover the cost and obtain benefits within one to three months; at the same time, due to the reduction in the number and capacity of the internal combustion engine front end wheel train generator, the service life and reliability of the internal combustion engine front end wheel train can be improved; further, the turbine generator can also drive the electric compressor to implement double supercharging of the internal combustion engine, thereby improving the output power of the internal combustion engine, which is beneficial to the increase of power of the internal combustion engine of the same volume and the reduction of size and cost of the same power.

[0048] It will be understood that the present invention is described by way of some embodiments, and it will be appreciated by those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are intended to be protected by the present invention.

Claims

1. An internal combustion engine exhaust gas recovery compound drive power generation system, comprising an internal combustion engine system (1), a turbine (2), a generator (4) and a load circuit (5), wherein the exhaust gas discharged by the internal combustion engine system (1) enters the turbine (2) to drive the turbine (2), and is characterized in that: The turbine (2) is coaxially connected to the generator (4) through a one-way overrunning coupler (3). The front end pulley belt of the internal combustion engine of the internal combustion engine system (1) is connected to the generator (4). The system drives the generator (4) through the one-way overrunning coupler (3) and the front end pulley belt of the internal combustion engine. The generator (4) is connected to the load circuit (5) to provide electrical energy for the load circuit (5). The internal combustion engine system (1) includes a compressor (11), an intercooler (12), an internal combustion engine (13), a turbocharger bypass valve (14), a turbine generator bypass valve (15) and an exhaust gas after-processor (16). Air g1 is input from the air inlet of the compressor (11) and is processed by the compressor (11) into compressed air. The air g2 then enters the intercooler (12), and the intercooler (12) outputs the cooling air g3 and enters the internal combustion engine (13). The internal combustion engine (13) outputs the combustion exhaust gas g4 and is divided into two paths. One path of the combustion exhaust gas g4 enters the compressor (11), and the other path of the bypass exhaust gas g5 passes through the turbocharger bypass valve (14) and is divided into two paths. One path is the turbine exhaust gas g6, and the other path is the bypass valve exhaust gas g7. The turbine exhaust gas g6 is input into the turbine (2) to drive the turbine (2), and the turbine (2) outputs the turbine exhaust gas g8; the bypass valve exhaust gas g7 passes through the turbine generator bypass valve (15) and enters the exhaust gas after treatment together with the turbine exhaust gas g8 output by the turbine (2). The exhaust gas after-processor (16) outputs the exhaust gas g9; the internal combustion engine (13) includes a front-end gear train (131), the front-end gear train (131) includes a crankshaft pulley (1311), an air conditioning pulley (1312), a water pump pulley (1313), a tensioner pulley (1314) and a belt (1315), and the generator (4) is driven by the belt (1315) of the front-end gear train (131) of the internal combustion engine (13); the one-way overrunning coupler (3) includes a pulley housing (31), a one-way outer ring (32), a one-way inner ring (33), a one-way needle roller (34); a sealing ring (35), a coupler core shaft (36) and a coupler The ball bearing (37) is provided on the outer ring (32) of the one-way device and is inside the pulley housing (31). The one-way device needle roller (34) forms a wedge angle with the outer ring (32) of the one-way device at an axial groove on the outer periphery of the inner ring (33) of the one-way device. The pulley rotates in the direction in which the wedge angle decreases to drive the coupler core shaft (36) to rotate. The pulley rotates in the direction in which the wedge angle increases to cause the coupler core shaft (36) to overtake and slip. The inner wall of the one-way overtaking coupler (3) has a turbine shaft connection thread (38) and a generator shaft connection thread (39); the turbine shaft connection thread (38) is threadedly connected to the turbine shaft (23), and the generator shaft connection thread (39) is connected to the generator shaft (49).

2. The internal combustion engine exhaust gas recovery hybrid drive power generation system according to claim 1, characterized in that: The turbine drive, belt drive or compound drive is adjusted according to the amount of exhaust gas discharged through the turbine generator bypass valve (15).

3. The internal combustion engine exhaust gas recovery hybrid drive power generation system according to claim 1, characterized in that: The turbine (2) comprises a turbine rear cover (21), turbine blades (22), a turbine shaft (23), a turbine bearing (24), a turbine housing (25), and a connecting piece (26); the turbine blades (22) are coaxially fixedly connected to the turbine shaft (23); the turbine rear cover (21) is connected to the turbine shaft (23) via the turbine bearing (24); the turbine housing (25) is fixedly connected to the front end of the turbine rear cover (21); and the rear end of the turbine rear cover (21) is rigidly fixedly connected to the front end cover of the generator via the connecting piece (26).

4. The internal combustion engine exhaust gas recovery hybrid drive power generation system according to claim 1, characterized in that: The generator (4) comprises a generator front end cover (41), a generator front bearing (42), a generator stator (43), a generator front rotor (44), a generator rear end cover (45), a generator rear bearing (46), a generator pole claw (47), a generator front bearing pressure cover (48), and a generator shaft (49).

5. The internal combustion engine exhaust gas recovery hybrid drive power generation system according to claim 1, characterized in that: The turbine generator bypass valve (15) comprises a bypass valve control unit (151), a bypass valve housing (152), a bypass valve actuator (153), a bypass valve connecting rod (154), a bypass valve butterfly valve (155) and a bypass valve valve shaft (156). After the bypass valve control unit (151) issues an instruction, the bypass valve actuator (153) performs an action to push or pull the bypass valve connecting rod (154), and the bypass valve butterfly valve (155) rotates with the bypass valve valve shaft (156) as the axis, thereby opening or closing the turbine generator bypass valve (15).

6. The internal combustion engine exhaust gas recovery hybrid drive power generation system according to claim 5, characterized in that: The turbine generator bypass valve (15) is a stroke valve or a rotary butterfly valve. The bypass valve control unit (151) gives a signal according to the internal combustion engine speed, internal combustion engine load, exhaust gas temperature and pressure, and pushes the bypass valve connecting rod (154) through the bypass valve actuator (153). The bypass valve connecting rod (154) pushes the rotary butterfly valve to rotate through a lever and a rotating shaft to adjust the amount of exhaust gas entering the turbine.

7. The internal combustion engine exhaust gas recovery hybrid drive power generation system according to claim 1, characterized in that: The opening and closing of the turbine generator bypass valve (15) is determined by the output power of the internal combustion engine and the power generated by the generator; the control strategy of the bypass valve control unit (151) of the turbine generator bypass valve (15) depends on the ratio of the exhaust gas discharged by the internal combustion engine to the exhaust gas required to drive the generator, and the opening ratio of the turbine generator bypass valve (15) decreases as the driving exhaust gas ratio decreases, so that the driving speed of the turbine does not exceed 10% of the belt driving speed.

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