Power unit

Abstract

In a power unit equipped with a hydrogen engine, if the throttle of the power unit is opened due to an increase in the load on the power unit, the power unit is configured to quickly recover (increase) its rotational speed. [Solution] The system includes a supercharger 3 which has a turbine motor 32 capable of rotating a turbine 31, and compresses air with the turbine 31 to supercharge the intake system of the hydrogen engine 1. Output devices 21 and 22 are provided which perform a charging operation to charge a battery 23 with electricity generated by a generator 2, a combining operation to operate the motor 2 with the electricity from the battery 23 so that the power of the hydrogen engine 1 and the power of the motor 2 are combined and output, and a supercharger operation to operate the turbine motor 32 with the electricity from the battery 23.

Description

Technical Field

[0001] The present invention relates to a power unit that outputs power for driving a generator, a pump, etc., and a power unit that is mounted on a work vehicle and outputs power for driving traveling power and a work device.

Background Art

[0002] As an example of the power unit as described above, as disclosed in Patent Document 1, there is a combination of a supercharger (turbocharger) having a turbine that is rotationally driven by supplying the exhaust gas of an engine, and an engine.

[0003] Such a power unit drives a generator or a pump at a constant rotational speed, drives a work vehicle at a constant speed, or drives a work device mounted on the work vehicle at a constant speed. Thus, when the load applied to the power unit increases and the rotational speed of the power unit decreases, it is necessary to quickly recover the rotational speed of the power unit. Similarly, even when the throttle of the power unit is opened to change the rotational speed of driving a generator or the like, it is necessary to quickly change the rotational speed of the power unit.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the power unit described in Patent Document 1, when the throttle of the power unit is opened due to an increase in the load on the power unit, it takes some time (time lag) from the moment the throttle of the power unit is opened until the engine speed increases, the engine exhaust increases, the turbine speed of the supercharger increases, the boost pressure to the engine by the supercharger increases, and the engine speed recovers (increases).

[0006] In recent years, hydrogen engines, which use hydrogen as fuel, have been studied as a way to reduce the environmental impact. A power unit is sometimes constructed by equipping a hydrogen engine with a supercharger, and there is a demand to minimize the aforementioned time lag in power units equipped with hydrogen engines.

[0007] The present invention aims to configure a power unit equipped with a hydrogen engine so that when the throttle of the power unit is opened due to an increase in the load on the power unit, the rotational speed of the power unit recovers (increases) quickly. [Means for solving the problem]

[0008] The power unit of the present invention includes a hydrogen engine supplied with hydrogen as fuel, a generator driven by the power of the hydrogen engine, a battery, a motor capable of adding power to the power of the hydrogen engine, a turbine rotated by the exhaust gas supplied from the hydrogen engine, and a turbine motor capable of rotating the turbine, and is equipped with a supercharger that compresses air with the turbine and supercharges the intake system of the hydrogen engine, and is equipped with an output device that performs a charging operation to charge the battery with electricity generated by the generator, a combining operation to operate the motor with the power of the battery so that the power of the hydrogen engine and the power of the motor are combined and output, and a supercharger operation to operate the turbine motor with the power of the battery.

[0009] According to the present invention, under normal conditions, the exhaust from the hydrogen engine is supplied to the turbine of the supercharger, and the hydrogen engine is supercharged by the supercharger, causing the hydrogen engine to operate. Since the generator is driven by the hydrogen engine, the output device performs a charging operation to charge the battery with the electricity generated by the generator.

[0010] If the throttle of the power unit is opened due to an increase in load on the power unit, the output device operates the motor using battery power, performing a combining operation so that the power of the hydrogen engine and the power of the motor are combined and output. This ensures that the power of the hydrogen engine and the power of the motor are combined quickly.

[0011] In addition, the output device performs a supercharging operation by using battery power to operate the turbine motor, and the turbine motor rotates. Compared to the increase in rotational speed of a hydrogen engine and the resulting increase in exhaust emissions, which in turn increases the rotational speed of the turbocharger's turbine, the turbocharger's turbine motor rapidly increases the turbine's rotational speed, thus causing the turbocharger's boost pressure to rise rapidly.

[0012] As described above, the motor's power is quickly combined with the hydrogen engine's power, and the turbine motor of the supercharger rapidly increases the turbine's rotational speed, which in turn rapidly increases the supercharger's boost pressure. This allows the rotational speed of the power unit to be quickly recovered (increased), thereby improving the power unit's performance.

[0013] Hydrogen engines are said to have lower torque at low RPMs compared to gasoline and diesel engines. If there is insufficient air supplied to the cylinders of a hydrogen engine, abnormal combustion such as knocking may occur, and nitrogen oxides (NOx) are more likely to be produced.

[0014] According to the present invention, even if the torque of the hydrogen engine is low at low rotational speeds, the power of the motor is quickly combined with the power of the hydrogen engine, and the rotational speed of the turbine is quickly increased by the turbine motor of the supercharger, and the supercharger pressure of the supercharger is quickly increased, thereby quickly recovering (increasing) the rotational speed of the power unit (hydrogen engine). The turbine motor of the supercharger rapidly increases the turbine's rotational speed, and the supercharger's boost pressure rapidly increases, ensuring that sufficient air is supplied to the cylinder, thereby suppressing abnormal combustion such as knocking and the generation of nitrogen oxides (NOx). This makes it possible to obtain a power unit suitable for hydrogen engines.

[0015] In the present invention, the motor and the generator are preferably a motor-generator.

[0016] According to the present invention, in normal conditions, the motor generator can be operated as a generator, and when the throttle of the power unit is opened, the motor generator can be operated as a motor. This allows for the motor and generator to be combined into a single unit, simplifying the structure of the power unit.

[0017] In the present invention, it is preferable that the hydrogen engine comprises a plurality of cylinders and an intake manifold connected to each of the cylinders, a hydrogen supply device capable of supplying hydrogen to the intake manifold, air from a supercharger supplied to the intake manifold, and a throttle capable of adjusting the air from the supercharger supplied to the intake manifold.

[0018] According to the present invention, a hydrogen engine has an advantageous configuration for improving responsiveness to throttle operation. [Brief explanation of the drawing]

[0019] [Figure 1] This diagram shows the overall configuration of the power unit. [Figure 2] It is a diagram showing the operating state of the power unit. [Figure 3] In the first alternative form of the invention, it is a diagram showing the overall configuration of the power unit. [Figure 4] In the second alternative form of the invention, it is a diagram showing the overall configuration of the power unit.

Mode for Carrying Out the Invention

[0020] (Overall configuration of the power unit) In FIGS. 1 to 4, a power unit having a hydrogen engine 1 to which hydrogen is supplied as fuel is shown. The power unit has, in addition to the hydrogen engine 1, a motor generator 2, an E-turbo 3, a separation device 4, and the like. By the power of the power unit, a generator, a pump, and the like are driven.

[0021] (Configuration of the hydrogen engine 1) As shown in FIG. 1, the hydrogen engine 1 has a crankcase 10, a cylinder 11, a cylinder head 12, etc., and is configured in an in-line four-cylinder type.

[0022] A crankshaft 13 is rotatably accommodated in the crankcase 10, and engine oil E1 is stored in the crankcase 10. Four cylinders 11 are provided on the upper part of the crankcase 10, and a connecting rod 15 is connected between a piston 14 provided inside the cylinder 11 and the crankshaft 13.

[0023] An intake port 16, an exhaust port 17, an intake valve 18, an exhaust valve 19, and a spark plug 20 are provided on the cylinder head 12 corresponding to each of the cylinders 11. An intake manifold 24 is provided on the cylinder head 12 so as to be connected across the four intake ports 16. An exhaust manifold 25 is provided on the cylinder head 12 so as to be connected across the four exhaust ports 17.

[0024] (Configuration related to the motor generator 2) As shown in Figure 1, the first inverter 21 is provided for the motor generator 2, and a battery 23 is provided.

[0025] A motor generator 2 is provided in the crankcase 10 of the hydrogen engine 1. In the hydrogen engine 1, a flywheel (not shown) is connected to the crankshaft 13, and a transmission gear (not shown) of the motor generator 2 meshes with the gear portion on the outer circumference of the flywheel. The flywheel is capable of storing rotational energy and releasing the stored rotational energy.

[0026] When the motor generator 2 operates as a motor, the DC power from the battery 23 is converted to AC power by the first inverter 21 and supplied to the motor generator 2, causing the motor generator 2 to operate as a motor. The power from the motor generator 2 is transmitted to the crankshaft 13 of the hydrogen engine 1 via the flywheel, and the power from the hydrogen engine 1 and the power from the motor generator 2 are combined and output from the crankshaft 13 of the hydrogen engine 1. The above state is the state in which the combining operation by the first inverter 21 has been performed.

[0027] When the motor generator 2 is operating as a generator, power from the hydrogen engine 1 is transmitted to the motor generator 2 via the flywheel, driving the motor generator 2. The AC power generated by the motor generator 2 is converted to DC power by the first inverter 21 and charged into the battery 23. The above state represents the state in which the charging operation by the first inverter 21 has been performed.

[0028] (Configuration of E-Turbo3) As shown in Figure 1, the E-turbo 3 has a turbine 31 and a turbine motor 32. The turbine 31 has a compressor wheel 31a and a turbine wheel 31b, and the compressor wheel 31a and the turbine wheel 31b are connected so as to rotate together as a single unit.

[0029] A first air cleaner 33 is provided. An intake passage 34 extends from the first air cleaner 33 and is connected to the compressor wheel 31a of the E-turbo 3. An intake passage 35 extends from the compressor wheel 31a of the E-turbo 3 and is connected to the intake manifold 24 of the hydrogen engine 1. A throttle 36 is provided in the intake passage 35.

[0030] An exhaust passage 37 extends from the exhaust manifold 25 of the hydrogen engine 1 and is connected to the turbine wheel 31b of the E-turbo 3. An exhaust passage 38 extends from the turbine wheel 31b of the E-turbo 3.

[0031] The turbine motor 32 is capable of rotating the turbine 31. A second inverter 22 is provided for the turbine motor 32, and the DC power from the battery 23 is converted into AC power by the second inverter 22 and supplied to the turbine motor 32, causing the turbine motor 32 to operate. The above state is the state in which supercharging operation by the second inverter 22 is performed.

[0032] The turbine wheel 31b (turbine 31) of the E Turbo 3 is rotationally driven by the exhaust from the exhaust manifold 25 and exhaust passage 37 of the hydrogen engine 1, and is also rotationally driven by the turbine motor 32.

[0033] A hydrogen tank 26 for storing hydrogen is provided, and an injection device 27 is installed on the intake manifold 24 of the hydrogen engine 1. Hydrogen from the hydrogen tank 26 is supplied to the injection device 27 through the fuel passage 28, and from the injection device 27 to the intake manifold 24 of the hydrogen engine 1.

[0034] With the above configuration, outside air passes through the first air cleaner 33 as clean combustion air, is supplied to the compressor wheel 31a of the E turbo 3 via the intake passage 34, is compressed, and then supplied (supercharged) to the intake manifold 24 of the hydrogen engine 1 via the intake passage 35 and throttle 36. The air supplied to the intake manifold 24 of the hydrogen engine 1 is regulated by the throttle 36.

[0035] Hydrogen is supplied to the intake manifold 24 of the hydrogen engine 1 via the injection device 27, and a mixture of hydrogen and air is supplied (supercharged) to the cylinder 11 via the intake manifold 24, intake port 16, and intake valve 18 of the hydrogen engine 1 for combustion.

[0036] The combustion gas from the combustion in the cylinder 11 of the hydrogen engine 1 is supplied as exhaust to the turbine wheel 31b of the E-turbo 3 via the exhaust port 17 and exhaust valve 19, exhaust manifold 25, and exhaust passage 37 of the hydrogen engine 1, thereby rotating the turbine 31 (turbine wheel 31b) of the E-turbo 3. The exhaust gas that has rotated the turbine 31 of the E-turbo 3 is discharged from the turbine wheel 31b of the E-turbo 3 via the exhaust passage 38.

[0037] (Configuration of separation device 4) As shown in Figure 1, the separation device 4 is directly attached to the outer surface of the cylinder 11 of the hydrogen engine 1, and the heat generated by combustion in the cylinder 11 of the hydrogen engine 1 is easily transferred to the separation device 4. A specific mounting location for the separation device 4 is, for example, the area where the fuel supply pump is attached in a diesel engine.

[0038] The discharge passage 40 is connected to the crankcase 10 of the hydrogen engine 1 and the separation device 4. The return passage 41 is also connected to the crankcase 10 of the hydrogen engine 1 and the separation device 4. A pressure sensor 48 is provided in the discharge passage 40.

[0039] The recirculation passage 42 extends from the separation device 4 and is connected to the portion of the intake passage 34 that is on the side of the first air cleaner 33 (upstream side) from the E turbo 3. A switching valve 43 is provided in the recirculation passage 42, and a hydrogen concentration sensor 44 is provided in the portion of the recirculation passage 42 between the separation device 4 and the switching valve 43.

[0040] The supply passage 45 extends from the portion of the intake passage 34 that is connected to the recirculation passage 42, on the side of the first air cleaner 33, and is connected to the crankcase 10 of the hydrogen engine 1. A second air cleaner 47 is provided, and the supply passage 46 extends from the second air cleaner 47 and is connected to the supply passage 45.

[0041] (Operating status of separation device 4) - 1 As shown in Figure 1, in the hydrogen engine 1, unburned gases and the fuel-air mixture (hereinafter referred to as blow-by gas) may leak from the cylinder 11 into the crankcase 10. The separation device 4 functions in response to this situation as described below.

[0042] The separation device 4 has a pump function that draws blow-by gas from the crankcase 10 of the hydrogen engine 1 through the discharge passage 40, and is configured so that the amount of blow-by gas drawn in can be changed. When the separation device 4 draws in blow-by gas from the crankcase 10 of the hydrogen engine 1, the engine oil E1 that has turned into a mist in the crankcase 10 of the hydrogen engine 1 is drawn into the separation device 4 together with the blow-by gas.

[0043] The separation device 4 separates the engine oil E1 from the inhaled blow-by gas and returns the separated engine oil E1 to the crankcase 10 of the hydrogen engine 1 via the return passage 41. The blow-by gas from which the engine oil E1 has been separated is supplied from the separation device 4 to the switching valve 43 via the recirculation passage 42.

[0044] The pressure of the blow-by gas drawn into the separation device 4 is detected by the pressure sensor 48. A setting device (not shown) sets a setting range for the blow-by gas pressure. The setting device allows the width of the setting range to be changed, and the setting range can be changed overall to the high-pressure or low-pressure side.

[0045] The separation device 4 changes the amount of blow-by gas drawn in so that the value detected by the pressure sensor 48 falls within the set range pre-set by the setting device. If the pressure sensor 48 detects a value higher than the set range, it is determined that this could lead to a blockage in the exhaust passage 40 and potentially stall the hydrogen engine 1. As a result, the amount of blow-by gas drawn in by the separation device 4 is changed to a higher level until the pressure sensor 48 detects a value within the set range. If the pressure sensor 48 detects a value lower than the set range, it is determined that the separator 4 is excessively drawing in blow-by gas. As a result, the amount of blow-by gas drawn in by the separator 4 is changed to a lower level until the pressure sensor 48 detects a value within the set range.

[0046] (Operating status of separation device 4) - 2 As shown in Figure 1, the switching valve 43 can be operated to a recirculation position in which blow-by gas from the separation device 4 is supplied to the recirculation passage 42 and then to the intake passage 34, and to a discharge position in which blow-by gas from the separation device 4 is released into the atmosphere.

[0047] The hydrogen concentration sensor 44 detects the hydrogen concentration of the blow-by gas from which the engine oil E1 has been separated by the separation device 4. If the hydrogen concentration detected by the hydrogen concentration sensor 44 is higher than a preset value, the switching valve 43 is automatically operated to the reduction position. The blow-by gas from which the engine oil E1 has been separated by the separation device 4 is supplied to the intake passage 34 via the reduction passage 42, merges with the air that has passed through the first air cleaner 33, and is supplied to the compressor wheel 31a of the E turbo 3, where it is compressed as described above and supplied to the cylinder 11 of the hydrogen engine 1.

[0048] If the hydrogen concentration detected by the hydrogen concentration sensor 44 is lower than the aforementioned set value, the switching valve 43 is automatically operated to the discharge position, and the blow-by gas from which the engine oil E1 has been separated by the separation device 4 is released into the atmosphere.

[0049] As described above, when the blow-by gas from the crankcase 10 of the hydrogen engine 1 is drawn in by the separation device 4, a portion of the air that enters the intake passage 34 through the first air cleaner 33 enters the supply passage 45 from the intake passage 34 and is supplied to the crankcase 10 of the hydrogen engine 1 via the supply passage 45. Outside air enters the supply passage 45 from the supply passage 46 as clean air after passing through the second air cleaner 47 and is supplied to the crankcase 10 of the hydrogen engine 1.

[0050] As a result, the following processes are continuously performed: intake of blow-by gas from the crankcase 10 of the hydrogen engine 1, supply or discharge of blow-by gas to the cylinder 11 of the hydrogen engine 1, and supply of air that has passed through the first air cleaner 33 and the second air cleaner 47 to the crankcase 10 of the hydrogen engine 1.

[0051] (Operating status of the power unit) - 1 As shown in Figure 1, under normal conditions, exhaust gas from the exhaust manifold 25 and exhaust passage 37 of the hydrogen engine 1 is supplied to the turbine wheel 31b (turbine 31) of the E-turbo 3, causing the turbine wheel 31b (turbine 31) of the E-turbo 3 to rotate, and the turbine motor 32 is not operating.

[0052] Air passing through the first air cleaner 33 is supplied to the compressor wheel 31a of the E turbo 3 via the intake passage 34, compressed, and then supplied (supercharged) to the intake manifold 24 of the hydrogen engine 1 via the intake passage 35 and throttle 36.

[0053] As described above, the hydrogen engine 1 operates at a constant rotational speed. The aforementioned intake of blow-by gas from the crankcase 10 of the hydrogen engine 1, supply or discharge of blow-by gas to the cylinder 11 of the hydrogen engine 1, and supply of air that has passed through the first air cleaner 33 and the second air cleaner 47 to the crankcase 10 of the hydrogen engine 1 are performed continuously.

[0054] Under normal conditions, the motor generator 2 operates as a generator. Power from the hydrogen engine 1 is transmitted to the motor generator 2 via the flywheel, driving the motor generator 2. The AC power generated by the motor generator 2 is converted to DC power by the first inverter 21 and charged into the battery 23.

[0055] (Operating status of the power unit) - 2 In the aforementioned normal state, if the load on the power unit increases and the rotational speed of the crankshaft 13 of the hydrogen engine 1 decreases, the following operations are performed in order to restore (increase) the rotational speed of the crankshaft 13 of the hydrogen engine 1.

[0056] As shown in Figures 1 and 2, assume that air volume AV1 is supplied to the cylinder 11 of the hydrogen engine 1 (supercharging), and the hydrogen engine 1 (crankshaft 13) is outputting power with torque NM1. In this state, if the load on the power unit increases and the rotational speed of the crankshaft 13 of the hydrogen engine 1 decreases, the throttle 36 is opened (time T1).

[0057] When the throttle 36 is opened and operated (time T1), the amount of air supplied (supercharged) to the cylinder 11 of the hydrogen engine 1 increases from air volume AV1 to air volume AV2 (time T2).

[0058] Simultaneously, the motor generator 2 operates as a motor (time T1), and the power of the hydrogen engine 1 and the power of the motor generator 2 are combined, causing the torque NM1 of the crankshaft 13 of the hydrogen engine 1 to increase to torque NM2 (time T2), and the rotational speed of the crankshaft 13 of the hydrogen engine 1 begins to recover (increase) rapidly.

[0059] As mentioned above, once the rotational speed of the crankshaft 13 of the hydrogen engine 1 begins to recover (increase) rapidly, the increased exhaust from the hydrogen engine 1 causes the rotational speed of the turbine wheel 31b (turbine 31) of the E turbo 3 to begin to increase.

[0060] In this case, in the E-turbo 3, the turbine motor 32 starts operating (time T2), the rotational speed of the turbine wheel 31b (turbine 31) of the E-turbo 3 increases rapidly, and the amount of air supplied (supercharged) to the cylinder 11 of the hydrogen engine 1 rapidly increases from air volume AV2 (time T2) to air volume AV3 (time T3). As a result, the torque NM2 of the crankshaft 13 of the hydrogen engine 1 increases to torque NM3 (at time T3), and the rotational speed of the crankshaft 13 of the hydrogen engine 1 quickly recovers (increases) to its normal state.

[0061] Subsequently, as the load on the power unit decreases, the rotational speed of the crankshaft 13 of the hydrogen engine 1 increases further from its normal state, indicating that the load on the power unit has decreased.

[0062] When it is determined that the load on the power unit has decreased (time T4), the motor generator 2 returns to operating as a generator. In the E-turbo 3, the turbine motor 32 stops, and the turbine wheel 31b (turbine 31) of the E-turbo 3 returns to a state where it is rotated solely by the exhaust from the hydrogen engine 1.

[0063] As a result, the hydrogen engine 1 returns to a state where air volume AV1 is supplied to cylinder 11 (supercharging) (time T5), and the hydrogen engine 1 (crankshaft 13) returns to a normal state where it outputs power of torque NM1 (time T5).

[0064] (First alternative embodiment of the invention) Instead of the configuration shown in Figure 1, the configuration shown in Figure 3 may be used. In Figure 3, the switching valve 43, hydrogen concentration sensor 44, second air cleaner 47, and supply passage 46 from Figure 1 have been eliminated.

[0065] As a result, the blow-by gas from which the engine oil E1 has been separated by the separation device 4 is constantly supplied to the intake passage 34 via the recirculation passage 42. Only a portion of the air that has passed through the first air cleaner 33 and entered the intake passage 34 is supplied to the crankcase 10 of the hydrogen engine 1 via the supply passage 45.

[0066] (Second alternative embodiment of the invention) Instead of the configuration shown in Figure 1, the configuration shown in Figure 4 may be used. In Figure 4, the switching valve 43, hydrogen concentration sensor 44, reduction passage 42, and supply passage 45 from Figure 1 have been eliminated, and the supply passage 46 is connected to the crankcase 10 of the hydrogen engine 1.

[0067] As a result, the blow-by gas from which the engine oil E1 has been separated by the separation device 4 is continuously released into the atmosphere from the separation device 4. Only the air that has passed through the second air cleaner 47 is supplied to the crankcase 10 of the hydrogen engine 1 via the supply passage 46.

[0068] (Third alternative form of the invention) The number and arrangement of the cylinders 11 may be configured as an inline 3-cylinder type, an inline 6-cylinder type, a V-type 6-cylinder type, a V-type 8-cylinder type, etc. The system may be configured so that liquefied hydrogen is stored in the hydrogen tank 26.

[0069] (Fourth alternative embodiment of the invention) The motor generator 2 may be located inside a flywheel housing (not shown) that accommodates the flywheel. The motor generator 2 may be provided inside or outside the flywheel housing, and the case (not shown) housing the motor generator 2 and the flywheel housing may be integrally configured.

[0070] The input / output shaft (not shown) of the motor generator 2 and the flywheel may be arranged coaxially, and the input / output shaft of the motor generator 2 and the flywheel may be connected so that the motor generator 2 and the flywheel rotate as a single unit.

[0071] (Fifth alternative embodiment of the invention) In Figure 2, the motor generator 2 may start operating as a motor, and the turbine wheel 31b (turbine 31) of the E turbo 3 may start rotating due to the turbine motor 32, both at the same time.

[0072] In Figure 2, the turbine wheel 31b (turbine 31) of the E-turbo 3 may be rotated by the turbine motor 32, and then the motor generator 2 may start operating as a motor.

[0073] (Sixth alternative embodiment of the invention) Multiple motor generators 2 may be provided. Instead of the motor-generator 2, a motor (not shown) and a generator (not shown) may be provided separately, or multiple motors and multiple generators may be provided separately.

[0074] (Correspondence with claims) - 1 The motor generator 2 corresponds to the motor and generator. The E-turbo 3 corresponds to the supercharger. The injection device 27 corresponds to the hydrogen supply device. The first inverter 21 and the second inverter 22 correspond to the output devices.

[0075] (Correspondence with claims) - 2 The system includes a hydrogen engine 1 supplied with hydrogen as fuel, a generator (motor generator 2) driven by the power of the hydrogen engine 1, a battery 23, and a motor (motor generator 2) capable of adding power to the power of the hydrogen engine 1.

[0076] The system includes a turbocharger (E-turbo 3) which has a turbine 31 that is rotated by the exhaust gas supplied from the hydrogen engine 1, and a turbine motor 32 capable of rotating the turbine 31, and which compresses air with the turbine 31 to supercharge the intake system of the hydrogen engine 1.

[0077] The system is equipped with output devices (first inverter 21, second inverter 22) that perform a charging operation to charge the battery 23 with electricity generated by the generator (motor generator 2), a combining operation to operate the motor (motor generator 2) with the electricity from the battery 23 so that the power of the hydrogen engine 1 and the power of the motor (motor generator 2) are combined and output, and a supercharging operation to operate the turbine motor 32 with the electricity from the battery 23.

[0078] (Correspondence with claims) - 3 The motor (motor generator 2) and the generator (motor generator 2) are both motor generator 2.

[0079] The hydrogen engine 1 is equipped with a plurality of cylinders 11 and an intake manifold 24 connected to each of the cylinders 11. A hydrogen supply device (injector 27) capable of supplying hydrogen to the intake manifold 24 is also provided. Air from the supercharger (E-turbo 3) is supplied to the intake manifold 24. The intake manifold 24 is equipped with a throttle 36 that can adjust the amount of air supplied to the supercharger (E-turbo 3). [Industrial applicability]

[0080] The present invention can be applied not only to power units that drive generators, pumps, etc., but also to power sources for self-propelled work vehicles such as tractors, and to power sources for stationary work machines equipped with work devices, such as construction machinery such as cranes. [Explanation of symbols]

[0081] 1. Hydrogen engine 2 Motor Generator (Generator) (Motor) 3 E-Turbo (Supercharger) 21. First Inverter (Output Device) 22. Second Inverter (Output Device) 23 batteries 24 Intake Manifold 27. Injection device (hydrogen supply device) 31 Turbine 32 Turbine motor 36 Throttle

Claims

1. A hydrogen engine is supplied with hydrogen as fuel, A generator driven by the power of the aforementioned hydrogen engine, Battery and A motor capable of supplying power to the hydrogen engine, The system includes a turbine that is driven to rotate by the exhaust gas supplied from the hydrogen engine, and a turbine motor capable of rotating the turbine, and a supercharger that compresses air with the turbine to supercharge the intake system of the hydrogen engine. A power unit equipped with an output device that performs a charging operation to charge the battery with electricity generated by the generator, a combining operation to operate the motor with the power from the battery so that the power from the hydrogen engine and the power from the motor are combined and output, and a supercharging operation to operate the turbine motor with the power from the battery.

2. The power unit according to claim 1, wherein the motor and the generator are a motor-generator.

3. The hydrogen engine is provided with a plurality of cylinders and an intake manifold connected to each of the cylinders. A hydrogen supply device capable of supplying hydrogen to the intake manifold is provided. The air from the supercharger is supplied to the intake manifold. The power unit according to claim 1 or 2, further comprising a throttle capable of adjusting the air supplied to the intake manifold by the supercharger.

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