Engine System

Abstract

To suppress occurrence of abnormal combustion caused by an excessively low temperature of a cylinder at start of an internal combustion engine.SOLUTION: An engine system includes an internal combustion engine, a hydrogen generation device, a gas flow passage and an introduction device. The internal combustion engine uses hydrogen as fuel. The hydrogen generation device generates hydrogen by heating a material of hydrogen. In the gas flow passage, gas heated by the hydrogen generation device flows. The introduction device introduces gas in the gas flow passage to an intake passage of the internal combustion engine. The control device controls the introduction device. The control device executes introduction processing for introducing the gas in the gas flow passage to the intake passage by controlling the introduction device while driving the hydrogen generation device on the condition that the internal combustion engine is in the stopped state.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to engine systems. [Background technology]

[0002] The engine system of Patent Document 1 includes an internal combustion engine and a hydrogen generator. The internal combustion engine uses hydrogen as fuel. The hydrogen generator generates hydrogen from water by electrolysis. The hydrogen generated by the hydrogen generator is then supplied to the internal combustion engine as fuel. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] US Patent Application Publication No. 2018 / 0112608 Summary of the Invention [Problem to be solved by the invention]

[0004] In an engine system such as that described in Patent Document 1, the temperature of the cylinders of the internal combustion engine drops when the engine is stopped. If the temperature of the cylinders is excessively low when the internal combustion engine is started, there is a possibility that hydrogen may burn abnormally, for example, at the time of starting. [Means for solving the problem]

[0005] The engine system for solving the above problem includes an internal combustion engine that uses hydrogen as fuel, a hydrogen generator that generates the hydrogen by heating a raw material for the hydrogen, and a supply passage for supplying the hydrogen generated by the hydrogen generation device to a fuel injection valve of the internal combustion engine, the supply passage being provided as a separate passage from the supply passage; Warmed by the heat of the hydrogen generator air a gas flow passage through which the gas flows; The air into an intake passage of the internal combustion engine; and a control device that controls the introducing device, and the control device controls the introducing device while driving the hydrogen generation device to introduce the hydrogen into the gas flow passage on the condition that the internal combustion engine is stopped. The airinto the intake passage.

[0006] According to the above configuration, when the introduction process is performed, the hydrogen generated by the hydrogen generator is heated. air Since the intake passage of the internal combustion engine is introduced, the intake passage and the cylinders of the internal combustion engine are warmed. Therefore, when the internal combustion engine is started after the introduction process, the cylinders of the internal combustion engine are already sufficiently warmed up at the time of starting. Therefore, abnormal combustion due to an excessively low cylinder temperature is unlikely to occur when the internal combustion engine is started. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 2 is a schematic configuration diagram of an engine system. [Figure 2] 10 is a flowchart showing a warm-up control. DETAILED DESCRIPTION OF THE INVENTION

[0008] <Outline of engine system configuration> An embodiment of the present invention will now be described with reference to Figures 1 and 2. First, the schematic configuration of an engine system 100 will be described.

[0009] As shown in Fig. 1, the engine system 100 includes an internal combustion engine 10. The internal combustion engine 10 is an internal combustion engine that uses hydrogen as fuel. The internal combustion engine 10 includes a head cover 21, a cylinder head 22, a cylinder block 23, a crankcase 24, and an oil pan 25. The internal combustion engine 10 also includes a plurality of pistons 31, a plurality of connecting rods 32, a crankshaft 33, an intake pipe 41, and an exhaust pipe 42.

[0010] The cylinder block 23 has four cylinders 23A and four upper spaces 23B as internal spaces of the cylinder block 23. The cylinders 23A extend from the upper end of the cylinder block 23 to near the center in the vertical direction. The cylinders 23A are spaces for burning a mixture of fuel and intake air. The upper spaces 23B extend from the lower ends of the cylinders 23A to the lower end of the cylinder block 23. Pistons 31 are located inside the cylinders 23A. The pistons 31 are connected to a crankshaft 33 via connecting rods 32. The pistons 31 reciprocate inside the cylinders 23A as the mixture of fuel and intake air burns in the cylinders 23A. The reciprocating motion of the pistons 31 rotates the crankshaft 33. Note that FIG. 1 shows only one cylinder 23A as a representative.

[0011] The crankcase 24 is connected to the lower end of the cylinder block 23. The crankcase 24 has a so-called ladder frame structure. Therefore, the crankcase 24 has four lower spaces 24A as internal spaces. The lower spaces 24A extend from the upper end to the lower end of the crankcase 24. The lower spaces 24A are connected to the lower ends of the upper spaces 23B. The cylinder block 23 and the crankcase 24 support the crankshaft 33 sandwiched between them. The upper spaces 23B of the cylinder block 23 and the lower spaces 24A of the crankcase 24 function as a crank chamber that houses the crankshaft 33.

[0012] The oil pan 25 is connected to the lower end of the crankcase 24. The oil pan 25 is shaped like a generally rectangular box with a bottom. Therefore, the oil pan 25 has an oil chamber 25A as an internal space of the oil pan 25. The oil chamber 25A is a space for storing oil. The oil stored in the oil chamber 25A is supplied to each part of the internal combustion engine 10 by a pump (not shown).

[0013] The cylinder head 22 is connected to the upper end of the cylinder block 23. The cylinder head 22 has four intake ports 22A, four exhaust ports 22B, and four combustion recesses 22C as an internal space of the cylinder head 22. The combustion recesses 22C are recessed upward from the lower surface of the cylinder head 22. The combustion recesses 22C are connected to the upper ends of the cylinders 23A. The combustion recesses 22C, the cylinders 23A, and the pistons 31 define a combustion chamber.

[0014] A first end of the intake port 22A is connected to the combustion recess 22C. A second end of the intake port 22A opens to a side surface of the cylinder head 22. An intake pipe 41 is connected to the second end of the intake port 22A. The intake pipe 41 introduces intake air from outside the internal combustion engine 10 into the intake port 22A. The intake port 22A introduces the intake air that has flowed through the intake pipe 41 into the cylinder 23A. In this embodiment, the intake port 22A and the intake pipe 41 form an intake passage of the internal combustion engine 10.

[0015] A first end of the exhaust port 22B is connected to the combustion recess 22C. A second end of the exhaust port 22B opens to a side surface of the cylinder head 22. An exhaust pipe 42 is connected to the second end of the exhaust port 22B. The exhaust port 22B discharges exhaust gas from the cylinder 23A to the exhaust pipe 42. The exhaust pipe 42 discharges the exhaust gas that has flowed through the exhaust port 22B to the outside of the internal combustion engine 10.

[0016] The head cover 21 is connected to the upper end of the cylinder head 22. The head cover 21 covers the cylinder head 22. The head cover 21, together with the cylinder head 22, defines an accommodation space 21A. The accommodation space 21A accommodates a valve mechanism and the like (not shown).

[0017] The internal combustion engine 10 includes a plurality of intake valves 34, a plurality of exhaust valves 35, a plurality of fuel injection valves 36, a plurality of ignition devices 37, and a throttle valve 38. The intake valve 34 is located at the connection between the intake port 22A and the combustion recess 22C. The intake valve 34 opens and closes the downstream end of the intake port 22A by driving force from a valve mechanism (not shown). The exhaust valve 35 is located at the connection between the exhaust port 22B and the combustion recess 22C. The exhaust valve 35 opens and closes the upstream end of the exhaust port 22B by driving force from a valve mechanism (not shown).

[0018] The throttle valve 38 is located midway through the intake pipe 41. The throttle valve 38 adjusts the amount of intake air flowing through the intake pipe 41. In this embodiment, the throttle valve 38 is one of the introducing devices that introduces gas from a gas flow passage 71 (described later) to the intake passage. The tip of the fuel injection valve 36 is located midway through the intake port 22A. The fuel injection valve 36 injects hydrogen as fuel into the intake port 22A. As a result, hydrogen is supplied to the cylinder 23A via the intake port 22A and the combustion recess 22C. The tip of the ignition device 37 is located in the combustion recess 22C. The ignition device 37 ignites the mixture of fuel and intake air by spark discharge.

[0019] The engine system 100 includes a motor generator 60 and a battery 65. The motor generator 60 is connected to the crankshaft 33 of the internal combustion engine 10. Therefore, the motor generator 60 can generate electric power using torque from the crankshaft 33 of the internal combustion engine 10. The battery 65 can store the electric power generated by the motor generator 60. When the motor generator 60 functions as an electric motor, torque from the motor generator 60 is applied to the crankshaft 33. Therefore, the motor generator 60 is an example of an electric motor that can apply torque to the crankshaft 33. The motor generator 60 is also one of the introducing devices that introduces gas from a gas flow passage 71, which will be described later, to the intake passage.

[0020] The engine system 100 includes a hydrogen generator 50, a supply passage 56, and a fuel tank 57. One example of the hydrogen generator 50 is a device that generates hydrogen from biomass. The hydrogen generator 50 includes a reactor 51 and a heater 52. The reactor 51 generates hydrogen from a hydrogen raw material accommodated in the reactor 51. Here, the hydrogen raw material is, for example, woody biomass. The heater 52 is capable of heating the hydrogen raw material accommodated in the reactor 51. The hydrogen generator 50 generates hydrogen, for example, as follows. First, the heater 52 heats the woody biomass accommodated in the reactor 51 to approximately 800°C to 1000°C. Then, the woody biomass in the reactor 51 is gasified. This gas contains, for example, ethanol gas, methanol gas, etc. Then, the reactor 51 generates hydrogen by reforming the gas. That is, the hydrogen generator 50 is a device that generates hydrogen by heating the hydrogen raw material. The configuration of the hydrogen generator 50 is well known. For example, the configuration of the hydrogen generator 50 is described in JP 2019-026503 A, JP 2019-041681 A, etc.

[0021] A first end of the supply passage 56 is connected to the hydrogen generator 50. A second end of the supply passage 56 is connected to the fuel injection valve 36. A fuel tank 57 is located midway along the supply passage 56. The fuel tank 57 is capable of storing hydrogen. Therefore, the hydrogen generated by the hydrogen generator 50 is temporarily stored in the fuel tank 57. The hydrogen stored in the fuel tank 57 is then supplied to the fuel injection valve 36 via the supply passage 56 on the fuel injection valve 36 side as viewed from the fuel tank 57. Although not shown, a regulator or the like is provided in the portion of the supply passage 56 on the fuel injection valve 36 side as viewed from the fuel tank 57 to reduce the pressure of the hydrogen fuel.

[0022] The engine system 100 includes a gas flow passage 71 and an on-off valve 72. The gas flow passage 71 is connected to the intake pipe 41 on the upstream side of the throttle valve 38. The gas flow passage 71 also passes through the hydrogen generator 50. In other words, a portion of the gas flow passage 71 is located inside the hydrogen generator 50. Specifically, a portion of the gas flow passage 71 is located near the reactor 51 and the heater 52 of the hydrogen generator 50. Therefore, the gas flowing through the portion of the gas flow passage 71 that is located near the reactor 51 and the heater 52 of the hydrogen generator 50 is heated by the reactor 51 and the heater 52. That is, gas heated by the heat of the hydrogen generator 50 flows through the gas flow passage 71. In this embodiment, the gas flowing through the gas flow passage 71 is air. The on-off valve 72 is located on the intake pipe 41 side of the gas flow passage 71 when viewed from the hydrogen generator 50. The on-off valve 72 switches the flow path of the gas flow passage 71 between an open state and a closed state. In this embodiment, the on-off valve 72 is a normally closed valve. Therefore, when the on-off valve 72 is not controlled to the open state by a control device 90 (described later), the on-off valve 72 closes the flow path of the gas flow passage 71.

[0023] As shown in FIG. 1 , the engine system 100 includes a water temperature sensor 81 and a control device 90. The water temperature sensor 81 detects the water temperature TW, which is the temperature of the coolant flowing through each part of the internal combustion engine 10. Specifically, the water temperature sensor 81 detects the temperature of the coolant at the downstream end of a water jacket located around the cylinder 23A as the water temperature TW. The control device 90 acquires a signal indicating the water temperature TW from the water temperature sensor 81. In this embodiment, the water temperature TW indicates the temperature of the cylinder 23A of the internal combustion engine 10. Therefore, the water temperature TW is an example of the temperature of the internal combustion engine 10.

[0024] The control device 90 controls the internal combustion engine 10, the hydrogen generator 50, the motor generator 60, and the on-off valve 72. Specifically, the control device 90 performs various controls such as adjusting the amount of fuel injected from the fuel injection valve 36, adjusting the ignition timing of the ignition device 37, and adjusting the opening of the throttle valve 38 by outputting a control signal to the internal combustion engine 10. The control device 90 adjusts the amount of hydrogen generated by the hydrogen generator 50 by outputting a control signal to the motor generator 60. The control device 90 adjusts the amount of power generated by the motor generator 60 by outputting a control signal to the on-off valve 72. The control device 90 controls the open / close state of the on-off valve 72 by outputting a control signal to the on-off valve 72.

[0025] The control device 90 may be configured as a circuit including one or more processors that execute various processes according to a computer program (software). The control device 90 may also be configured as a circuit including one or more dedicated hardware circuits, such as an application-specific integrated circuit (ASIC), that execute at least some of the various processes, or a combination thereof. The processor includes a CPU and memory such as RAM and ROM. The memory stores program code or instructions configured to cause the CPU to execute processes. The memory, i.e., computer-readable medium, includes any medium that can be accessed by a general-purpose or dedicated computer.

[0026] <Warm air control> Next, a description will be given of the warm-up control executed by the control device 90. In this embodiment, the control device 90 repeatedly executes the warm-up control on the condition that the internal combustion engine 10 is stopped.

[0027] As shown in FIG. 2, when the control device 90 starts warm-up control, it executes the process of step S11. In step S11, the control device 90 determines whether the water temperature TW is equal to or lower than a predetermined specified temperature A. Here, the specified temperature A is determined, for example, as follows. First, as a premise, in the internal combustion engine 10, abnormal hydrogen combustion can occur in the cylinder 23A not only in a region where the temperature of the cylinder 23A is excessively high, but also in a region where the temperature of the cylinder 23A is excessively low. Therefore, an upper limit temperature of a region where abnormal hydrogen combustion can occur due to a low temperature of the cylinder 23A is determined by experiment, etc. Then, a value that is a certain value higher than the determined upper limit temperature is set as the specified temperature A. Note that an example of the specified temperature A is approximately several degrees Celsius to several tens of degrees Celsius. In step S11, if the control device 90 determines that the water temperature TW is higher than the specified temperature A (S11: NO), the control device 90 ends the current warm-up control. On the other hand, if the control device 90 determines in step S11 that the water temperature TW is equal to or lower than the specified temperature A (S11: YES), the control device 90 proceeds to step S12. In other words, the control device 90 proceeds with the processing from step S12 onwards on the condition that the internal combustion engine 10 is stopped and the water temperature TW is equal to or lower than the specified temperature A.

[0028] In step S12, the control device 90 drives the hydrogen generation device 50 by outputting a control signal to the hydrogen generation device 50. Specifically, the control device 90 heats the hydrogen raw material contained in the reactor 51 with the heater 52. If the hydrogen generation device 50 is already driven due to another factor, the control device 90 maintains that state. Thereafter, the control device 90 advances the process to step S13.

[0029] In step S13, the control device 90 outputs a control signal to the throttle valve 38 to increase the opening of the throttle valve 38 compared to before execution of step S13 began. Specifically, the control device 90 controls the throttle valve 38 to a fully open state. If the throttle valve 38 is fully open at the time when execution of step S13 begins, the control device 90 maintains that state of the throttle valve 38. Thereafter, the control device 90 proceeds to step S14.

[0030] In step S14, the control device 90 controls the on-off valve 72 to an open state by outputting a control signal to the on-off valve 72. Thereafter, the control device 90 advances the process to step S15.

[0031] In step S15, the control device 90 controls the motor generator 60 by outputting a control signal to the motor generator 60. Specifically, the control device 90 drives the motor generator 60 to rotate the crankshaft 33. An example of the rotation speed of the crankshaft 33 at this time is approximately several hundred rpm. In this embodiment, the processing of steps S12 to S15 is an introduction processing in which the hydrogen generation device 50 is driven while the introduction device is controlled to introduce the gas in the gas flow passage 71 into the intake passage. Thereafter, the control device 90 ends the current warm-up control. Note that in this embodiment, when the internal combustion engine 10 is driven, the control device 90 ends the processing of steps S12 to S15 described above, i.e., the introduction processing.

[0032] <Operation of this embodiment> As shown in FIG. 2, in the engine system 100, the processes from step S12 onward are executed under the conditions that the internal combustion engine 10 is stopped and the water temperature TW is equal to or lower than a specified temperature A. Then, in step S15, the crankshaft 33 is rotated by torque from the motor generator 60. Then, even when the internal combustion engine 10 is stopped, the rotation of the crankshaft 33 causes the piston 31 to repeatedly reciprocate. Therefore, each cylinder 23A repeats an intake stroke, a compression stroke, a combustion stroke, and an exhaust stroke. As a result, air flowing in from the intake pipe 41 flows in the following order: the intake pipe 41, the intake port 22A, the cylinder 23A, the exhaust port 22B, and the exhaust pipe 42. Furthermore, air flowing in from the gas flow passage 71 flows in the following order: the gas flow passage 71, the intake pipe 41, the intake port 22A, the cylinder 23A, the exhaust port 22B, and the exhaust pipe 42. Here, in step S12, the hydrogen generator 50 is driven. Then, the gas in the gas flow passage 71 in the portion located near the reactor 51 and the heater 52 of the hydrogen generator 50 is heated by the reactor 51 and the heater 52. Therefore, when the introduction process as described above is performed, the gas heated by the heat of the hydrogen generator 50 flows through the intake pipe 41, the intake port 22A, the cylinder 23A, the exhaust port 22B, and the exhaust pipe 42.

[0033] <Effects of this embodiment> (1) In the engine system 100, the introduction process is executed to warm up the cylinders 23A and the like of the internal combustion engine 10 even when the internal combustion engine 10 is stopped. Therefore, when the internal combustion engine 10 is started after the introduction process, the cylinders 23A and the like of the internal combustion engine 10 are already sufficiently warmed up at the time of starting. As a result, when the internal combustion engine 10 is started, abnormal combustion due to an excessively low temperature of the cylinder 23A is unlikely to occur.

[0034] (2) In this embodiment, the control device 90 executes the introduction process not only when the internal combustion engine 10 is stopped but also when the water temperature TW is equal to or lower than a specified temperature A. Therefore, the introduction process is not executed when the water temperature TW is higher than the specified temperature A, i.e., when there is little need to warm up the cylinder 23A of the internal combustion engine 10. Therefore, it is possible to prevent the waste of energy for driving the motor generator 60, etc., due to unnecessary operation of the motor generator 60, etc.

[0035] (3) In the introduction process, the control device 90 drives the motor generator 60 to rotate the crankshaft 33. Therefore, even when the internal combustion engine 10 is stopped, while the crankshaft 33 is being rotated by the motor generator 60, gas from the gas flow passage 71 flows through the intake pipe 41, the intake port 22A, the cylinder 23A, the exhaust port 22B, and the exhaust pipe 42. This allows a large amount of gas to flow from the gas flow passage 71 to the cylinder 23A, etc. As a result, the internal combustion engine 10 can be warmed up efficiently.

[0036] (4) Generally, when the internal combustion engine 10 is stopped, the throttle valve 38 is controlled to a closed state. In this regard, the control device 90 controls the throttle valve 38 to a fully open state in the introduction process. This allows gas from the gas flow passage 71 to be introduced into the cylinder 23A, etc. more efficiently than when the throttle valve 38 is controlled to a closed state, for example.

[0037] <Example of change> This embodiment can be modified as follows: This embodiment and the following modifications can be combined and implemented within the scope of technical compatibility.

[0038] In the above embodiment, the warm-up control may be changed. For example, the process of step S11 may be omitted. Specifically, when the warm-up control is started, the control device 90 may execute the process of step S12 regardless of the water temperature TW. According to this configuration, the processes from step S12 onward can be executed regardless of the water temperature TW.

[0039] For example, the opening of the throttle valve 38 in step S13 may be changed. As a specific example, in step S13, the control device 90 may control the throttle valve 38 to an opening state that is smaller than the fully open state, if the opening is larger than before the execution of step S13 started.

[0040] For example, the process of step S14 may be omitted. As a specific example, if the engine system 100 does not include the on-off valve 72, the process of step S14 may be omitted.

[0041] For example, the process of step S15 may be omitted. As a specific example, if the throttle valve 38 and the on-off valve 72 are switched to the open state, the gas in the gas flow passage 71 can flow into the intake pipe 41 to some extent. If the gas in the gas flow passage 71 flows into the intake pipe 41, the gas also flows into the intake port 22A and the cylinder 23A via the intake pipe 41. As a result, the cylinder 23A and the like are warmed. In other words, it is not essential to rotate the crankshaft 33 in the introduction process.

[0042] In the above embodiment, the configuration of the engine system 100 may be changed. For example, the engine system 100 may include, as the introducing device, a blower that blows gas from the intake passage of the internal combustion engine 10 into the cylinder 23A. In this configuration, the blower may be located upstream of the throttle valve 38 in the intake pipe 41 and downstream of the connection with the gas flow passage 71. Specific examples of the blower include a fan rotated by an electric motor, a supercharger compressor driven by torque from the crankshaft 33, and a supercharger compressor driven by an electric motor. This configuration increases the amount of gas introduced from the intake passage of the internal combustion engine 10 into the cylinder 23A per unit time. This makes it easier to increase the amount of gas flowing from the gas flow passage 71 to the cylinder 23A, etc.

[0043] For example, the electric motor in the introduction device is not limited to the motor generator 60. As a specific example, the engine system 100 may be provided with a starter motor capable of rotating the crankshaft 33. In this case, the starter motor can be employed as an electric motor capable of applying torque to the crankshaft 33.

[0044] For example, the connection configuration between the gas flow passage 71 and the intake passage of the internal combustion engine 10 may be changed. As a specific example, the gas flow passage 71 may be connected to the intake pipe 41 downstream of the throttle valve 38. As a specific example, the intake pipe 41 may be omitted, and the gas flow passage 71 may be connected to the second end of the intake port 22A. In this case, the throttle valve 38 may be located midway along the gas flow passage 71. In this configuration, the gas flow passage 71 also functions as an intake passage.

[0045] For example, the on-off valve 72 may be omitted. Specifically, if the on-off valve 72 is omitted, gas flows through the gas flow passage 71 regardless of whether the introduction process is being performed. Therefore, even if the temperature of the cylinder 23A is relatively high because the internal combustion engine 10 is running, if the hydrogen generator 50 is running, gas warmed by the heat of the hydrogen generator 50 can flow to the cylinder 23A, etc. Therefore, for example, if the above-mentioned situation is acceptable, the on-off valve 72 may be omitted.

[0046] The hydrogen generator 50 is not limited to the example of the above embodiment. That is, the hydrogen generator 50 may have various configurations as long as it generates hydrogen by heating a hydrogen raw material.

[0047] <Related technical ideas> The technical ideas that can be understood from the above-described embodiment and modified examples will be described. (Appendix 1) a hydrogen-fueled internal combustion engine; a hydrogen generator that generates the hydrogen by heating the hydrogen raw material; a gas flow passage through which gas warmed by the heat of the hydrogen generator flows; an introducing device that introduces gas from the gas flow passage into an intake passage of the internal combustion engine; a control device that controls the introduction device; Equipped with The control device, on condition that the internal combustion engine is stopped, drives the hydrogen generation device while controlling the introducing device to perform an introducing process for introducing the gas in the gas flow passage into the intake passage. Institutional system.

[0048] (Appendix 2) The control device executes the introduction process under the condition that the internal combustion engine is stopped and the temperature of the internal combustion engine is equal to or lower than a predetermined temperature. 1. An engine system as described in Appendix 1.

[0049] (Appendix 3) the introducing device includes an electric motor capable of applying torque to a crankshaft of the internal combustion engine, The control device drives the electric motor to rotate the crankshaft in the introduction process. 1. An engine system according to claim 1 or 2.

[0050] (Appendix 4) the introducing device includes a throttle valve that adjusts the amount of intake air flowing through the intake passage, the gas flow passage is connected to the intake passage on an upstream side of the throttle valve, The control device controls the throttle valve to a fully open state in the introduction process. An engine system according to any one of Supplementary Notes 1 to 3.

[0051] (Appendix 5) the introducing device includes a blower that blows gas in the intake passage into a cylinder of the internal combustion engine, The control device drives the blower in the introduction process. An engine system according to any one of Supplementary Notes 1 to 4. [Explanation of symbols]

[0052] 10...Internal combustion engine 21...Head cover 22...Cylinder head 22A...Intake port 22B...Exhaust port 23...Cylinder block 23A...cylinder 24…Crankcase 25...Oil pan 31...Piston 32...Connecting rod 33...Crankshaft 38...Throttle valve 41...intake pipe 42...Exhaust pipe 50...Hydrogen generator 51...Reactor 52...heater 56…Supply passage 57...Fuel tank 60...Motor generator 71...Gas flow passage 72...Shut-off valve 81...Water temperature sensor 90...Control device 100...Engine System

Claims

1. a hydrogen-fueled internal combustion engine; a hydrogen generator that generates the hydrogen by heating the hydrogen raw material; a supply passage for supplying the hydrogen generated in the hydrogen generator to a fuel injection valve of the internal combustion engine; a gas flow passage provided as a passage separate from the supply passage, through which air heated by the heat of the hydrogen generation device flows; an introducing device that introduces the air in the gas flow passage into an intake passage of the internal combustion engine; a control device that controls the introduction device; Equipped with The control device, on condition that the internal combustion engine is stopped, drives the hydrogen generation device while controlling the introducing device to perform an introducing process of introducing the air in the gas flow passage into the intake passage. Institutional system.

2. the control device executes the introduction process under the condition that the internal combustion engine is stopped and the temperature of the internal combustion engine is equal to or lower than a predetermined specified temperature; The specified temperature is a temperature for determining whether or not abnormal combustion of hydrogen may occur in a cylinder of the internal combustion engine due to a low temperature of the cylinder. The engine system of claim 1 .

3. the introducing device includes an electric motor capable of applying torque to a crankshaft of the internal combustion engine, The control device drives the electric motor to rotate the crankshaft in the introduction process.

3. The engine system according to claim 1 or claim 2.

4. the introducing device includes a throttle valve that adjusts the amount of intake air flowing through the intake passage, the gas flow passage is connected to the intake passage on an upstream side of the throttle valve, The control device controls the throttle valve to a fully open state in the introduction process. The engine system of claim 1 .

5. the introducing device includes a blower that blows gas in the intake passage into a cylinder of the internal combustion engine, The control device drives the blower in the introduction process. The engine system of claim 1 .

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