Leak detection device of blowby gas and vehicle

Abstract

To provide a leak detection device which can protect a pressure sensor for detecting a leak of a blowby gas from a corrosive environment as much as possible, and a vehicle.SOLUTION: In a leak detection device of one embodiment of the present disclosure for making a crank chamber and an intake flow passage constituting an engine communicate with each other, and detecting a leak of a blowby gas in a fresh air line having a crest-shaped bent zone which is folded into a reverse V-shape or a reverse U-shape with an upper part in a gravity direction as a base point, the leak detection device includes a pressure sensor arranged at a top of the crest-shaped bent zone, and capable of detecting the pressure of the fresh air line, and a cooling mechanism arranged at a lower side of the pressure sensor in a vertical direction in the crest-shaped bent zone, and cooling the blowby gas.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a leak detection device that detects the leakage of blow-by gas in a PCV circuit mounted on, for example, a gasoline engine. [Background technology]

[0002] Conventionally, automobile engines have been equipped with a PCV (Positive Crankcase Ventilation) circuit for guiding blow-by gas that has leaked into the crankcase from the combustion chamber through the gap between the cylinder and the piston to the intake passage.

[0003] If a leak occurs in the flow path of the PCV circuit (also called the "PCV flow path") through which the blow-by gas flows for some reason, the blow-by gas will be released into the atmosphere outside the engine. Therefore, for example, Patent Document 1 proposes a technology for detecting a leak in the PCV flow path by measuring the pressure in the crankcase and detecting the leak based on this pressure.

[0004] Similarly, the leak detection device in Patent Document 2 proposes a pressure sensor that is attached to the crankcase to measure the pressure inside the crank chamber, and a pressure sensor that is attached to the intake manifold to measure the pressure inside the intake manifold. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2013-117176 A [Patent Document 2] JP 2017-166449 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, current technologies, including those described in the above-mentioned patent documents, cannot be said to satisfy the potential needs for leak detection, and the following problems remain. For example, in the above-mentioned patent document, although it is possible to perform a leak diagnosis based on pressure fluctuations using a pressure sensor, the pressure sensor is placed in a corrosive environment because blow-by gas flows through the PCV circuit in the first place. Since corrosion of such a pressure sensor can also result in measurement abnormalities, it is desirable in the above-mentioned leak detection to isolate the pressure sensor from the corrosive environment as much as possible.

[0007] The present disclosure has been made in consideration of the above-mentioned problems as an example, and aims to provide a blow-by gas leak detection device and a vehicle that can isolate a pressure sensor that detects blow-by gas leaks from a corrosive environment as much as possible. [Means for solving the problem]

[0008] In order to solve the above problems, a blow-by gas leak detection device in one embodiment of the present disclosure is a leak detection device that detects blow-by gas leaks in a fresh air line that connects the crank chamber and intake flow path of an engine and has a mountain-shaped bent zone that is bent in an inverted V shape or an inverted U shape from an upper part in the direction of gravity, and includes a pressure sensor that is installed at the top of the mountain-shaped bent zone and can detect the pressure of the fresh air line, and a cooling mechanism that is positioned in the mountain-shaped bent zone vertically below the pressure sensor and cools the blow-by gas.

[0009] In order to solve the above problems, the vehicle according to the present disclosure is equipped with this blow-by gas leak detection device. Effect of the Invention

[0010] According to the present disclosure, it is possible to isolate a pressure sensor that detects leakage of blow-by gas from a corrosive environment as much as possible. [Brief description of the drawings]

[0011] [Figure 1] 1 is a schematic diagram showing a fresh air line for an engine mounted on a vehicle according to an embodiment; [Diagram 2] 1 is a schematic diagram of an engine equipped with a leak detection device according to an embodiment; [Diagram 3] FIG. 2 is a schematic diagram showing a detailed structure of a leak detection device according to an embodiment. [Figure 4] FIG. 2 is a schematic diagram showing a part of a first wind turbine that constitutes the wind turbine mechanism in the embodiment. [Diagram 5] FIG. 4 is a schematic diagram showing a part of a second wind turbine that constitutes the wind turbine mechanism in the embodiment. [Figure 6] FIG. 2 is a schematic diagram showing the flow of gas including fresh air or blow-by gas during supercharged operation and non-supercharged (naturally aspirated) operation. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Next, a preferred embodiment for implementing the present disclosure will be described. The dimensions, materials, and other design specifications shown in such an embodiment are merely examples for facilitating understanding of the present disclosure, and do not limit the present disclosure unless otherwise specified. Note that configurations other than those described in detail below can be implemented by appropriately supplementing known engine structures described in, for example, JP 2017-166449 A.

[0013] [Engine 10] First, the configuration of an engine 10 mounted on a vehicle in a preferred embodiment of the present disclosure will be described with reference to Figures 1 and 2. Note that examples of vehicles suitable for this embodiment include two-wheeled vehicles and four-wheeled vehicles equipped with a known transmission, and may also be known hybrid vehicles equipped with an electric motor.

[0014] 2, the engine 10 of this embodiment may be a horizontally opposed four-cylinder engine in which cylinder bores 13 formed in two cylinder blocks 12 are arranged facing each other across a crankshaft 11. A crankcase 14 is integrally formed with the cylinder blocks 12. A cylinder head 15 is fixedly disposed on the cylinder block 12 on the side opposite the crankcase 14.

[0015] The crankshaft 11 is rotatably supported via bearings in a known crank chamber formed in the crankcase 14. A piston 18 connected to the crankshaft 11 via a connecting rod 17 is slidably provided in the cylinder bore 13. Therefore, the space surrounded by the cylinder bore 13, the cylinder head 15, and the crown surface of the piston 18 functions as a combustion chamber 19 of the engine 10 in this embodiment.

[0016] An intake port 20 and an exhaust port 21 are formed in the cylinder head 15 so as to communicate with the combustion chamber 19. A tip portion of an intake valve 22 is positioned between the intake port 20 and the combustion chamber 19. A tip portion of an exhaust valve 23 is positioned between the exhaust port 21 and the combustion chamber 19. A cam chamber surrounded by the cylinder head 15 and the head cover 24 is provided with a well-known intake valve cam 25 and exhaust valve cam 26.

[0017] Of these, the intake valve cam 25 abuts against the other end of the intake valve 22 and rotates under the action of the intake camshaft, thereby enabling the intake valve 22 to advance and retract in the axial direction. On the other hand, the exhaust valve cam 26 abuts against the other end of the exhaust valve 23 and rotates under the action of the exhaust camshaft, thereby enabling the exhaust valve 23 to advance and retract in the axial direction.

[0018] 2, an intake passage 28 including a known intake manifold 27 is connected to the upstream side of the intake port 20 of this embodiment. This intake passage 28 is provided with a known air cleaner 32, a compressor 31b of a turbocharger 31, an intercooler 33, a throttle valve 34, and the like.

[0019] The downstream side of the exhaust port 21 of this embodiment is connected to an exhaust passage 30 including a known exhaust manifold 29. As described above, the engine 10 of this embodiment is configured to include a known turbocharger 31. Therefore, the exhaust gas discharged from the combustion chamber 19 passes through the exhaust port 21, is collected in the exhaust manifold 29, and then is guided to the turbocharger 31.

[0020] The exhaust gas generated by this combustion is guided to the turbine 31a of the turbocharger 31 via the exhaust port 21 and the exhaust manifold 29. After the turbocharger 31 rotates the turbine 31a, the exhaust gas is purified by a known catalyst 35 provided in the exhaust passage 30 and then discharged outside the vehicle.

[0021] The engine 10 of this embodiment also has a fresh air line 36 that guides air (fresh air) to the crankcase 14. Such fresh air line 36 communicates, for example, between the air cleaner 32 and the compressor 31b in the intake passage 28 and the above-mentioned crank chamber formed in the crankcase 14. There are no particular limitations on the material of the fresh air line 36, and a known material used in fresh air lines, for example, as disclosed in JP2017-166449A, may be used.

[0022] The fresh air line 36 and the intake passage 28 may be connected via a known control valve V1. A known control device such as an ECU mounted on a vehicle can block or connect the fresh air line 36 to the intake passage 28 via this control valve V1. Note that various known valve mechanisms capable of blocking the flow of gas may be applied as the control valve V1. Furthermore, the control valve V1 is not essential to the engine 10, and the control valve V1 may be omitted as appropriate.

[0023] The engine 10 of this embodiment also has a scavenging line 37 for scavenging blow-by gas present in a crank chamber formed in the crankcase 14. Such a scavenging line 37 communicates the crank chamber with the intake manifold 27. There are no particular limitations on the material of the scavenging line 37, and for example, a known material used in a scavenging line disclosed in JP 2017-166449 A may be used.

[0024] 2, a control valve V2 for connecting or blocking the scavenging line 37 to the crank chamber is provided at a connection between the scavenging line 37 and the crank chamber. As the control valve V2, various known valve mechanisms capable of blocking the flow of gas may be applied, similar to the control valve V1.

[0025] A known oil catch tank 38 is provided below the turbocharger 31. Oil stored in this oil catch tank 38 is sucked by a known scavenge pump 39 and returned to the oil pan of the engine 10 via a suction line 40. In addition, the oil catch tank 38 is connected to a crank chamber formed in the crankcase 14 by a balance line 41.

[0026] This balance line 41 has the function of equalizing the pressure in the oil catch tank 38 with the pressure in the crank chamber by communicating between the crank chamber and the oil catch tank 38. The balance line 41, together with the fresh air line 36 and the scavenging line 37, constitutes the PCV system in the engine 10. Therefore, in this embodiment, the flow path formed by the fresh air line 36, the scavenging line 37, and the balance line 41 is defined as a "PCV flow path."

[0027] <Leak detection device 100> Next, the configuration of a blow-by gas leak detection device 100 will be described with reference to Figures 1 to 5. This leak detection device 100 is mounted on the above-mentioned vehicle and is configured to have a function of detecting leaks in a PCV flow path including at least a fresh air line 36 that communicates between a crank chamber constituting a part of the above-mentioned engine 10 and the intake flow path 28. As can be seen from Figures 1 and 2, the fresh air line 36 includes a mountain-shaped bent zone MBZ that is bent in an inverted V-shape or an inverted U-shape with the upper part in the gravity direction (Z direction in the figure) as a base point.

[0028] The fresh air line 36 may have one or more mountain-shaped bend zones MBZ between the crankcase and the intake flow path 28. When the fresh air line 36 has multiple mountain-shaped bend zones MBZ, the leak detection device 100 may be provided in any one of the multiple mountain-shaped bend zones MBZ. As an example, when the fresh air line 36 has multiple mountain-shaped bend zones MBZ, it is preferable to provide the leak detection device 100 in the mountain-shaped bend zone MBZ that is located at the highest position in the direction of gravity.

[0029] More specifically, the leak detection device 100 of this embodiment includes a pressure sensor 101 and a cooling mechanism 102. Furthermore, the leak detection device 100 of this embodiment preferably further includes a windmill mechanism 103 in addition to the pressure sensor 101 and cooling mechanism 102 described above.

[0030] The pressure sensor 101 communicates with the PCV flow path and has a function of detecting the pressure in the PCV flow path. More specifically, the pressure sensor 101 of this embodiment is installed at the top (the highest position in the direction of gravity) of the mountain-shaped bent zone MBZ in the fresh air line 36 that constitutes a part of the PCV flow path. This enables the pressure sensor 101 to measure the pressure in the fresh air line 36. There are no particular limitations on the specific example of the pressure sensor 101, and any known pressure sensor may be applied.

[0031] The cooling mechanism 102 is disposed in the mountain-shaped bending zone MBZ in which the pressure sensor 101 is disposed, vertically below the pressure sensor 101. In this manner, the cooling mechanism 102 is provided in the mountain-shaped bending zone MBZ, and has a function of cooling gas, including blow-by gas, that flows into the fresh air line 36 from the crankcase side.

[0032] More specifically, the cooling mechanism 102 of this embodiment is configured to include a known Peltier element PE. That is, as shown in Fig. 3, the cooling mechanism 102 is configured to include a first Peltier element PE1 arranged on the crank chamber side when the pressure sensor 101 of the mountain-shaped bending zone MBZ is taken as the base point, and a second Peltier element PE2 arranged on the intake flow path 28 (control valve V1) side when the pressure sensor 101 of the mountain-shaped bending zone MBZ is taken as the base point. Therefore, when the Peltier element PE constituting the cooling mechanism 102 is driven, the gas flowing in the mountain-shaped bending zone MBZ is cooled and the dew point temperature drops.

[0033] The windmill mechanism 103 is disposed vertically below the cooling mechanism 102 in the mountain-shaped bend zone MBZ in which the pressure sensor 101 is disposed. In other words, in the mountain-shaped bend zone MBZ in the fresh air line 36, the pressure sensor 101, the cooling mechanism 102, and the windmill mechanism 103 are arranged in this order from vertically above. Since the windmill mechanism 103 is disposed in the fresh air line 36, the blow-by gas flowing in the fresh air line 36 and the fresh air (air) flowing in from the intake flow path 28 via the control valve V1 pass through the windmill mechanism 103.

[0034] The windmill mechanism 103 of this embodiment also includes a known generator (not shown) equipped with a magnet and a coil that is driven by the rotation of the windmill WM described below. This allows the windmill mechanism 103 to generate electricity by the action of the windmill WM that rotates in conjunction with the passage of gas circulating in the fresh air line 36.

[0035] 3, the windmill mechanism 103 of this embodiment is electrically connected to the Peltier element PE constituting the cooling mechanism 102. As a result, at least one of the blow-by gas and fresh air flowing through the fresh air line 36 passes through the windmill mechanism 103, causing the windmill WM to rotate, and the electric power obtained by the rotation of the windmill WM is supplied to the Peltier element PE.

[0036] 3 to 5, the wind turbine mechanism 103 may include a plurality of types of wind turbines WM having different blade shapes. More specifically, the wind turbine mechanism 103 of this embodiment includes a first wind turbine WM1 provided on the crank chamber side of the pressure sensor 101, and a second wind turbine WM2 provided on the intake flow path 28 side of the pressure sensor 101.

[0037] FIG. 4 shows an example of the first wind turbine WM1 constituting the wind turbine mechanism 103 in this embodiment. The first wind turbine WM1 is, for example, a known multi-blade wind turbine. As shown in the figure, the first wind turbine WM1 is configured to be rotatable around the rotation axis C1 by including a plurality of rotors RW1 suitable for a known multi-blade wind turbine. The first wind turbine WM1 is installed in the mountain-shaped bend zone MBZ of the fresh air line 36 by known fastening means such as welding or screwing. Note that the first wind turbine WM1 may be installed in the fresh air line 36 outside the mountain-shaped bend zone MBZ as long as it is closer to the crankcase than the pressure sensor 101.

[0038] FIG. 5 shows an example of the second wind turbine WM2 constituting the wind turbine mechanism 103 in this embodiment. The second wind turbine WM2 is, for example, a known propeller-type wind turbine. As shown in the figure, the second wind turbine WM2 is configured to be rotatable around the rotation axis C2 by including a plurality of rotors RW2 suitable for a known propeller-type wind turbine. The second wind turbine WM2 is installed in the mountain-shaped bend zone MBZ of the fresh air line 36 by known fastening means such as welding or screwing. The second wind turbine WM2 may be installed in the fresh air line 36 outside the mountain-shaped bend zone MBZ as long as it is closer to the intake flow path than the pressure sensor 101.

[0039] In this way, the first wind turbine WM1 and the second wind turbine WM2 constituting the wind turbine mechanism 103 are configured to have different shapes and numbers of rotor blades, for example. That is, in this embodiment, a multi-blade type wind turbine is provided as the first wind turbine WM1 in order to actively strike and liquefy the blow-by gas. On the other hand, a propeller type wind turbine with good rotation efficiency is provided as the second wind turbine WM2 on the intake passage 28 side, since the main role of the wind turbine WM1 is to generate electricity. Note that the first wind turbine WM1 and the second wind turbine WM2 may use rotor blade shapes other than those described above, as long as they are in line with the spirit of this embodiment.

[0040] 3, the number of first wind turbines WM1 and the number of second wind turbines WM2 installed in the fresh air line 36 including the mountain-shaped bend zone MBZ may be different from each other. That is, the first wind turbines WM1 are preferably arranged in a multi-stage configuration of two or more stages in the fresh air line 36 in order to effectively strike as much blow-by gas as possible against the rotor blades. On the other hand, the second wind turbines WM2 may be arranged in a single stage or multiple stages depending on the desired power generation amount.

[0041] As an example, in this embodiment, the number of first wind turbines WM1 (two-stage configuration) is greater than the number of second wind turbines WM2 (single-stage configuration). This makes it possible to efficiently cool the blow-by gas while ensuring the power required for the cooling mechanism 102 by the wind turbine mechanism 103, without impeding the flow of gas in the fresh air line 36 as much as possible.

[0042] The pressure sensor 101 is controlled by a known control device including an electronic control unit (ECU) mounted on the vehicle. The control device has a function of determining the presence or absence of a leak in the PCV flow path based on the pressure in the PCV flow path when the PCV flow path is blocked, for example. That is, the leak detection device 100 of this embodiment can detect the pressure in the fresh air line 36 with the pressure sensor 101 in a state in which the control valve V1 is blocked under the control of the control device. This makes it possible to detect a leak of blow-by gas in the PCV flow path including the fresh air line 36.

[0043] For example, when the pressure value of the pressure sensor 101 is equal to or lower than a predetermined value, the control device may determine that there is a possibility that a leak has occurred in the PCV flow path due to some factor. Note that the predetermined value may vary depending on the number of cylinders and specifications of the engine 10, but can be set in advance through experiments, simulations, or the like.

[0044] <Gas flow in the fresh air line during turbocharged and non-turbocharged operation> Next, the gas flow state in the fresh air line 36 during supercharged operation and non-supercharged (naturally aspirated) operation of the engine 10 in this embodiment will be described with reference to Fig. 6. Note that non-supercharged operation in this embodiment also includes the case of naturally aspirated operation of the engine 10 without the supercharger 31.

[0045] That is, the above-mentioned fresh air line 36 and scavenging line 37 are mainly used to discharge blow-by gas in the crank chamber. Here, the direction of the blow-by gas flowing through the fresh air line 36 and the scavenging line 37 differs between non-supercharged (naturally aspirated) operation in which the intake air to the engine 10 is not supercharged and supercharged operation in which the above-mentioned intake air is supercharged by the supercharger 31. Below, the explanation will be continued using the fresh air line 36 of the PCV flow path as an example.

[0046] That is, first, during the above-mentioned supercharging operation, the internal pressure generated in the intake manifold 27 becomes high due to the supercharging action of the supercharger 31. Therefore, the internal pressure of the crank chamber also becomes higher than that of the fresh air line 36, fresh air cannot flow from the intake passage 28 to the fresh air line 36, air flows back from the crankcase 14, and the blow-by gas in the crankcase 14 cannot be collected.

[0047] That is, in the above-mentioned supercharging state, as shown in Fig. 6(a), when the above-mentioned control valve V1 is in an open state, there is a possibility that the blow-by gas in the crankcase 14 will flow into the fresh air line 36. In response to this, the leak detection device 100 of this embodiment is provided with a windmill mechanism 103 in the fresh air line 36, so that the blow-by gas in a relatively high temperature state can be actively cooled and liquefied by contacting the first windmill WM1. In addition, the blow-by gas at this time rotates the first windmill WM1, so that the power required for the cooling mechanism 102 can be generated.

[0048] Therefore, the blow-by gas that has passed through the wind turbine WM is further cooled by the cooling mechanism 102 (first Peltier element PE1) arranged in front of the pressure sensor 101, and liquefied below the dew point. Since the cooling mechanism 102 is provided in the mountain-shaped bend zone MBZ of the fresh air line 36, the liquefied blow-by gas does not reach the pressure sensor 101 by flowing down the slope of the mountain-shaped bend zone MBZ due to its own weight.

[0049] As shown in Fig. 6, the gas including the blow-by gas that has passed under the pressure sensor 101 passes through the second wind turbine WM2 provided on the downward slope of the mountain-shaped bending zone MBZ. This drives the second wind turbine WM2, thereby ensuring the power required to drive the second Peltier element PE2. Note that the wind turbine mechanism 103 of this embodiment may include a known secondary battery capable of storing the power generated by the wind turbine mechanism 103. This makes it possible to stably ensure the power required to drive the cooling mechanism 102.

[0050] As described above, when the engine 10 is operating in a supercharged state, there is a possibility that the blow-by gas in the crankcase 14 will flow into the fresh air line 36. However, in the leak detection device 100 having the above-described configuration, the blow-by gas is unlikely to reach the pressure sensor 101, and therefore contamination of the pressure sensor 101 by this blow-by gas is suppressed.

[0051] On the other hand, during the non-supercharged (naturally aspirated) operation described above, the internal pressure in the intake manifold 27 is not higher than that described above, and the pressure inside the crankcase 14 becomes negative relative to the fresh air line 36 due to the action of the piston movement in the engine 10.

[0052] That is, in a non-supercharged (naturally aspirated) state of the engine 10, as shown in FIG. 6(b), when the above-mentioned control valve V1 is in an open state, scavenging is possible via the scavenging line 37, and the blow-by gas in the crankcase 14 flows out to the scavenging line 37, and fresh air (new air) is introduced into the crankcase 14 from the intake passage 28 via the fresh air line 36.

[0053] At this time, in the mountain-shaped bent zone MBZ of the fresh air line 36, the second wind turbine WM2 arranged on the upward gradient and the first wind turbine WM1 arranged on the downward gradient generate power using the fresh air. This power generation drives the Peltier element PE constituting the cooling mechanism 102, so that the fresh air is cooled and dehumidified by the Peltier element PE. This prevents excess water droplets from adhering to the pressure sensor 101. In addition, if the wind turbine mechanism 103 is equipped with the above-mentioned secondary battery, it is possible to stably secure the power required to drive the cooling mechanism 102 during non-supercharging operation.

[0054] Thus, according to the leak detection device 100 of this embodiment and the vehicle equipped with the leak detection device 100, the pressure sensor 101 is disposed at a high position in the mountain-shaped bending zone MBZ, and the blow-by gas is liquefied by the cooling mechanism 102 and caused to flow down by its own weight in the mountain-shaped bending zone MBZ, thereby protecting the pressure sensor 101 from corrosion by the blow-by gas. The blow-by liquefied in the mountain-shaped bending zone MBZ can eventually return to the intake manifold 27 by passing through the intake passage 28 or by flowing through the fresh air line 36 together with fresh air during non-supercharged operation.

[0055] Although the preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, the present disclosure is not limited to such examples. It is clear that a person having ordinary knowledge in the technical field to which the present disclosure belongs may attempt to further modify these embodiments and modifications within the scope of the technical ideas described in the claims, and it is understood that these also naturally belong to the technical scope of the present disclosure. For example, in this embodiment, the cooling mechanism 102 is driven by electricity generated by the wind mill mechanism 103, but this is not limited to this form. The cooling mechanism 102 may be driven regardless of whether the wind mill mechanism 103 is driven or not by installing a known power source such as a secondary battery in addition to the wind mill mechanism 103. [Explanation of symbols]

[0056] 10 Engine 28 Intake passage 36 New Air Line 100 Leak Detection Device 101 Pressure Sensor 102 Cooling mechanism 103 Windmill mechanism

Claims

1. A leak detection device for detecting a leak of blow-by gas in a fresh air line that communicates between a crank chamber and an intake passage constituting an engine and has a mountain-shaped bent zone that is bent in an inverted V-shape or an inverted U-shape with an upper portion in the direction of gravity as a base point, a pressure sensor installed at the top of the mountain-shaped bend zone and capable of detecting the pressure of the fresh air line; a cooling mechanism that is disposed in the mountain-shaped bending zone vertically below the pressure sensor and cools the blow-by gas; A blow-by gas leak detection device comprising:

2. 2. The leak detection device according to claim 1, further comprising a windmill mechanism disposed vertically below said cooling mechanism in said mountain-shaped bend zone, through which said blow-by gas and fresh air from said intake passage pass.

3. the cooling mechanism includes a Peltier element, The windmill mechanism is electrically connected to the Peltier element, 3. The leak detection device according to claim 2, wherein electric power obtained by passing at least one of the blow-by gas and the fresh air through the windmill mechanism is supplied to the Peltier element.

4. The windmill mechanism includes: a first windmill provided on the crank chamber side relative to the pressure sensor; a second wind turbine provided on a side of the intake air flow path relative to the pressure sensor, The leak detection device according to claim 3 , wherein the first and second wind turbines have different shapes.

5. A vehicle equipped with the leak detection device according to any one of claims 1 to 4.

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