Combustion pressure data transmission device, ship-to-shore communication system equipped with the same, and combustion pressure data transmission method

Abstract

To provide a combustion pressure data transmitter, a ship-land communication system having the same, and a combustion pressure data transmission method, capable of reducing the amount of data transmission from a ship to the land via satellite communication while making data contents capable of appropriate monitoring for the state of internal combustion engine equipped on a ship at a management device on the land.SOLUTION: A combustion pressure data transmitter, provided in a ship for transmitting combustion pressure data of an internal combustion engine equipped on the ship using ship-land communication system for transmitting data from the ship to a management device on the land via satellite communication, includes: a condition determination unit for obtaining predetermined condition data relating to the internal combustion engine and for determining whether the condition data satisfy a predetermined condition or not; a combustion pressure data extraction unit for extracting combustion pressure data of the internal combustion engine for at least a part of period within a period satisfying the condition; and a signal generation unit for generating a data transmission signal for transmitting the extracted combustion pressure data to the management device.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a combustion pressure data transmitting device provided on a ship, a ship-to-shore communication system including the same, and a combustion pressure data transmitting method. [Background technology]

[0002] It is known to acquire combustion pressure data of an internal combustion engine such as an engine in order to diagnose the state of the internal combustion engine or detect signs of deterioration, etc., based on the combustion state of the internal combustion engine. Furthermore, the acquired combustion pressure data is also transmitted to a management device provided at a location separate from the facility or mobile body equipped with the internal combustion engine, and the data is analyzed by the management device.

[0003] When this technology is applied to an internal combustion engine installed on a ship, the combustion pressure data acquired on the ship is transmitted to a management device on land. In land-based facilities or mobile bodies, not only wired communication but also wireless communication allows for inexpensive and high-speed data transmission via the Internet from multiple access points.

[0004] On the other hand, since ships travel on ocean routes far from access points installed on land, it is necessary to use satellite communication to transmit data from the ship to a management device on land (see, for example, Patent Document 1 below). When using satellite communication to transmit data, communication fees are higher than communication via the Internet on land, and it is not practical to constantly transmit combustion pressure data that changes from moment to moment.

[0005] When extracting and transmitting specific data to reduce communication volume, if the time for extracting the data is set arbitrarily, the analysis of the data in the management device may be affected, and the analysis may not be performed correctly. In addition, the following Patent Document 2 discloses a method for reducing communication volume by comparing the data transmitted last time with the data to be transmitted this time, and transmitting only the data that differs from the previous time.

[0006] However, when such a method is applied to combustion pressure waveform data, which is prone to fluctuations due to disturbances, there is a risk that the amount of communication will not be reduced because there will be almost no data having the same value as the previous time due to fluctuations in the value (combustion pressure) on the same horizontal axis (e.g., the crank angle of an internal combustion engine). [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2014-75654 A [Patent Document 2] Japanese Patent Application Publication No. 62-39941 Summary of the Invention [Problem to be solved by the invention]

[0008] The present invention has been made in consideration of the above, and aims to provide a combustion pressure data transmission device, a ship-to-shore communication system including the same, and a combustion pressure data transmission method that can reduce the amount of data transmitted from the ship to shore via satellite communication while providing data content that enables a management device on land to properly monitor the status of an internal combustion engine installed on a ship. [Means for solving the problem]

[0009] A combustion pressure data transmitting device according to one aspect of the present invention is a combustion pressure data transmitting device provided on a ship to transmit combustion pressure data of an internal combustion engine provided on the ship using a ship-to-shore communication system that transmits data from the ship to a management device on land via satellite communication, the combustion pressure data transmitting device being provided on the ship and relating to the internal combustion engine. This is different from the combustion pressure data. A condition determination unit that acquires predetermined condition data and determines whether the condition data satisfies a predetermined condition; and extraction The device further includes a combustion pressure data extracting section that extracts combustion pressure data of the internal combustion engine during a period of time, and a signal generating section that generates a data transmission signal for transmitting the extracted combustion pressure data to the management device.

[0010] According to the above configuration, the internal combustion engine This is different from the combustion pressure data. When the predetermined condition data satisfies a predetermined condition, at least a part of the period during which the condition is satisfied extraction Combustion pressure data of the internal combustion engine during the period is extracted. Therefore, the combustion pressure data when the internal combustion engine is in a specified state is transmitted. This makes it possible to transmit combustion pressure data that matches the conditions to be analyzed by the management device. As described above, it is possible to reduce the amount of data transmitted from the ship to the land via satellite communication while providing data content that enables the land-based management device to appropriately monitor the state of the internal combustion engine installed on the ship.

[0011] The condition determination unit determines whether a period during which the condition data is in a predetermined state continues for a predetermined reference period or longer, and determines that the condition is satisfied when the period during which the condition data is in the predetermined state continues for the reference period or longer. The combustion pressure data extraction unit The combustion pressure data during the extraction period is acquired at a predetermined data acquisition interval, and at least a portion of the combustion pressure data acquired during the period in which the condition is satisfied is extracted as combustion pressure data to be transmitted to the management device. You may do so.

[0012] According to the above configuration, when the period during which the internal combustion engine is in a predetermined state continues for a predetermined reference period or longer, the combustion pressure data of the internal combustion engine is extracted. Therefore, it is possible to transmit the combustion pressure data when the internal combustion engine is stable in that state. This makes it possible to extract more appropriate combustion pressure data that matches the conditions to be analyzed by the management device.

[0013] The extraction period may be a period from a predetermined crank angle to a predetermined end angle of the internal combustion engine, thereby making it possible to transmit combustion pressure data in a specific state (scavenging, compression, combustion, exhaust, etc.) of the internal combustion engine.

[0014] The condition determination unit is During a period determined by the data acquisition interval of the combustion pressure data, It may be determined that the condition is satisfied when a state in which the variance, standard deviation or coefficient of variation of the acquired condition data is within a predetermined threshold range continues for the reference period. Acquisition of combustion pressure dataBy making a condition judgment based on the variance, standard deviation or coefficient of variation of the condition data for a period determined by the period, it is possible to transmit combustion pressure data relating to the state of the internal combustion engine to be analyzed by the management device while allowing for a certain degree of disturbance.

[0015] The condition data may be data that changes with a change in load on the internal combustion engine, thereby making it possible to transmit combustion pressure data when the internal combustion engine is in a specified load state.

[0016] The condition data may include at least one of engine load data, engine speed data, fuel injection amount data, engine load command value data, engine speed command value data, fuel injection amount command value data, and supercharger speed data.

[0017] The combustion pressure data extraction unit may have a data interpolation unit that determines whether the extracted combustion pressure data is missing in part, and if so, interpolates the data of the missing part from data before and after the missing part. Even if the extracted combustion pressure data is missing in part, the source of the combustion pressure data (the ship side) can perform data interpolation in advance, eliminating the need to separately send information (data) indicating the presence of missing data to the management device. In addition, data is not rejected due to missing data in the management device, and valid combustion pressure data can be efficiently transmitted.

[0018] The condition determination unit may have a condition setting unit that is capable of changing the setting of the condition. By enabling various condition settings, it is possible to easily extract and transmit combustion pressure data in a plurality of states of the internal combustion engine.

[0019] The internal combustion engine may include a plurality of cylinders, and the combustion pressure data extraction unit may extract the combustion pressure data from at least one cylinder that is designated in advance among the plurality of cylinders.

[0020] A ship-to-shore communication system according to another aspect of the present invention includes the above-described combustion pressure data transmitting device, and a management device that is provided on land and transmits and receives data to and from the combustion pressure data transmitting device via satellite communication.

[0021] A combustion pressure data transmission method according to another aspect of the present invention is a method for transmitting combustion pressure data of an internal combustion engine provided on a ship using a ship-to-shore communication system that transmits data from a ship to a land-based management device via satellite communication, the method comprising: This is different from the combustion pressure data. The method includes acquiring predetermined condition data, determining whether the condition data satisfies a predetermined condition, and determining whether the condition data satisfies at least a portion of the period during which the condition is satisfied. extraction Combustion pressure data of the internal combustion engine during a period is extracted, a data transmission signal for transmitting the extracted combustion pressure data to the management device is generated, and the data transmission signal is transmitted to the management device. Effect of the Invention

[0022] According to the present invention, it is possible to reduce the amount of data transmitted from the ship to the land via satellite communication while providing data content that enables a management device on land to appropriately monitor the status of an internal combustion engine installed on a ship. [Brief description of the drawings]

[0023] [Figure 1] FIG. 1 is a block diagram showing a schematic configuration of a ship-to-shore communication system to which a combustion pressure data transmitting device according to an embodiment of the present invention is applied. [Diagram 2] FIG. 2 is a diagram illustrating functional blocks in the data transmitting device illustrated in FIG. [Diagram 3] FIG. 3 is an image diagram illustrating a combustion data extraction mode in this embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following, the same or corresponding elements are denoted by the same reference numerals throughout the drawings, and duplicated descriptions thereof will be omitted.

[0025] 1 is a block diagram showing a schematic configuration of a ship-to-shore communication system to which a combustion pressure data transmitting device according to an embodiment of the present invention is applied. The ship-to-shore communication system 1 in this embodiment includes an onboard system 2 provided on a ship 4 and a management device 3 provided on land.

[0026] The boat 4 includes an internal combustion engine 5, an engine control device 6a that controls the internal combustion engine 5, and an engine measurement device 6b that measures the state of the internal combustion engine 5. The engine control device 6a acquires data related to the internal combustion engine 5 and controls the internal combustion engine 5 and the like based on the data. The engine measurement device 6b measures combustion pressure data (combustion waveform data) of the internal combustion engine 5. The internal combustion engine 5 includes, for example, a large two-cycle (two-stroke) engine 10 (hereinafter simply referred to as the engine) that is the main engine for propelling the boat 4, and a supercharger 20 that compresses air to supply scavenging air to the engine 10. The engine 10 may be an engine for generating electricity for the boat 4. Also, instead of the two-cycle engine 10, a four-cycle (four-stroke) engine may be provided. In this case, "scavenging air" in the following description is replaced with "air supply."

[0027] The engine 10 has a plurality of cylinders 11 (only one is shown in FIG. 1). In particular, in a uniflow two-stroke engine, each cylinder 11 has a scavenging port 12 formed in a lower portion and an exhaust port 13 formed in an upper portion. Each cylinder 11 is provided with a piston 14, a fuel injection valve 15, and an exhaust valve 16. The piston 14 slides within the cylinder 11 across the scavenging port 12, and its lower end portion is connected to a crankshaft 18 via a connecting rod 17.

[0028] The fuel injection valve 15 is located in an upper portion of the cylinder 11, and is supplied with fuel from a fuel supply device 31. The fuel supply device 31 can change the fuel injection pattern and fuel injection timing of the fuel injection valve 15. The exhaust valve 16 is a valve that opens and closes the exhaust port 13, and is driven by an exhaust valve drive device 32. The exhaust valve drive device 32 can change the opening and closing pattern and opening and closing timing of the exhaust valve 16.

[0029] The turbocharger 20 is configured to adiabatically compress the air supplied to the engine 10. The turbocharger 20 includes a compressor 22 having a plurality of compressor blades and compressing air introduced from the outside by rotating about a rotary shaft 23, and a turbine 21 connected to the rotary shaft 23 of the compressor 22 and generating rotational power for the compressor 22.

[0030] The air compressed by the compressor 22 is supplied to the engine 10 as scavenging air via a scavenging pipe 24 and a scavenging chamber 25. Exhaust gas discharged by combustion in the engine 10 flows into a turbine 21 of the turbocharger 20. The turbine 21 includes a plurality of turbine blades, and is rotated about a rotary shaft 23 by the exhaust gas that flows in, thereby rotating the compressor 22.

[0031] The onboard system 2 includes a data transmission device 7 for transmitting data acquired by the engine control device 6a and the engine measurement device 6b to the management device 3. The data transmission device 7 acquires predetermined data from the engine control device 6a and the engine measurement device 6b, and generates a data transmission signal to be transmitted to the management device 3. The data transmission device 7 includes a known computer device.

[0032] Furthermore, the onboard system 2 is equipped with an extraboard communication unit 8 that transmits a data transmission signal generated by the data transmission device 7 to the management device 3 via satellite communication. The data transmission device 7 and the extraboard communication unit 8 are connected via an onboard LAN 9 so as to be able to send and receive signals. The extraboard communication unit 8 is equipped with a mail server capable of sending, for example, e-mails. Various data servers, computing devices, input devices, display devices, etc. can be connected to the onboard LAN 9.

[0033] The data transmission signal sent from the extravehicular communication unit 8 is transmitted by satellite communication via a communication satellite 40. The management device 3 may be provided with a satellite antenna 41 capable of receiving the data transmission signal via satellite communication. In addition to this, or instead of this, the data transmission signal may be received once by another satellite antenna 42 provided on land, and the data transmission signal may be transmitted from this satellite antenna 42 to the management device 3 via a communication network 43 such as the Internet.

[0034] Hereinafter, there will be described an aspect in which the data transmitting device 7 in this embodiment transmits the combustion pressure data of the internal combustion engine 5. That is, the data transmitting device 7 in this embodiment functions as a combustion pressure data transmitting device.

[0035] Fig. 2 is a diagram showing functional blocks in the data transmission device shown in Fig. 1. As shown in Fig. 2, the data transmission device 7 in this embodiment includes a condition determination unit 71, a combustion pressure data extraction unit 72, and a signal generation unit 73.

[0036] The condition determination unit 71 acquires predetermined condition data related to the internal combustion engine 5, and determines whether or not the condition data satisfies a predetermined condition. In the present embodiment, the condition data is data that changes depending on a change in the load of the internal combustion engine 5.

[0037] The data that changes due to a change in the load of the internal combustion engine 5 may include engine load data obtained by directly or indirectly detecting the load on the movable parts of the internal combustion engine 5, fuel injection amount data obtained by detecting the amount of fuel injected from the fuel injection valve 15, engine speed command value data indicating an engine speed command value output from the engine control device 6a, fuel injection amount command value data indicating a fuel injection amount command value output from the engine control device 6a, and supercharger rotation speed data obtained by detecting the rotation speed of the supercharger 20. In addition, when the internal combustion engine 5 is an internal combustion engine for power generation, since load control may be performed with the rotation speed of the internal combustion engine 5 kept constant, in that case, the engine load command value data may be used as the condition data. The condition determination unit 71 may make a determination using any one of these data. Alternatively, the condition determination unit 1 may make a determination using multiple types of data among these data. In other words, the determination condition described later may be an AND condition or an OR condition for determining each of multiple types of data.

[0038] The engine load data may be data detected by the load detector 51. For example, the load detector 51 may detect a displacement in the internal combustion engine 5 or an output shaft connected thereto. The engine measurement device 6b or the condition determination unit 71 may calculate the load from the detected displacement. The fuel injection amount and the engine speed may be acquired from the engine control device 6a, and the virtual load may be calculated from them. The fuel injection amount is detected by the fuel injection amount detector 61 provided in the fuel supply device 31, and sent to the engine control device 6a. The engine speed is detected by the engine speed detector 62 provided in the internal combustion engine 5, and sent to the engine control device 6a. Note that FIG. 2 illustrates both a mode in which the engine load data is acquired from the load detector 51 via the engine measurement device 6b, and a mode in which the engine load data is acquired from the fuel injection amount detector 61 and the engine speed detector 62 via the engine control device 6a, but when acquiring the engine load data, the condition determination unit 71 may acquire the engine load data in either one of these modes.

[0039] As described above, data (condition data) that changes with load changes of the internal combustion engine 5 is input to the data transmitting device 7 via the engine control device 6a and / or the engine measurement device 6b. Alternatively, the data transmitting device 7 may acquire the condition data directly from the corresponding detectors 51, 61, 62, etc. Information on judgment conditions is stored in a storage unit (not shown) of the data transmitting device 7. A condition judgment unit 71 reads out the judgment conditions and judges whether the acquired condition data (engine load data) satisfies the judgment conditions.

[0040] In this embodiment, the condition determination unit 71 determines whether a period during which the variance of the condition data acquired during a predetermined period is within a predetermined threshold range is a predetermined reference period T r It is determined whether the period of time in the predetermined state continues for more than a reference period T r If the period continues for this period or more, it is determined that the condition is satisfied. The combustion pressure data extraction unit 72 extracts the combustion pressure data of the internal combustion engine 5 for at least a part of the period during which the condition is satisfied.

[0041] FIG. 3 is an image diagram illustrating a combustion data extraction mode in this embodiment. The top graph is a graph showing a change in load over time. The engine measurement device 6b measures the combustion pressure from the combustion pressure detector 52 at a predetermined sampling period and generates combustion pressure data. The combustion pressure data extraction unit 72 receives the combustion pressure data from the engine measurement device 6b at a predetermined time interval (hereinafter, the data acquisition interval T d The combustion pressure data is acquired periodically (for example, at 10 minute intervals). The combustion pressure data extraction unit 72 extracts the combustion pressure data of the internal combustion engine 5 during a predetermined extraction period from the acquisition timing.

[0042] The condition determination unit 71 determines the data acquisition interval T d The second graph from the top in Figure 3 shows the variance V of the condition data over a given time interval T d1 is a graph showing the change over time in the variance of the load in the data set. The variance V is calculated by squaring the difference between the average value of each of a number of data elements, adding the squared difference and dividing the sum by the number of data elements. The condition decision unit 71 decides whether or not this variance V satisfies a condition (within a threshold range: 0≦V≦V max Furthermore, the condition determination unit 71 determines whether the state in which the variance V satisfies the condition has continued for a predetermined number of times (for example, four times). For example, if the state in which the variance V satisfies the condition has continued for four consecutive times (if the condition has been satisfied at all times from time t1 to time t4 in FIG. 3), it is determined that the state in which the condition has been satisfied continues for the reference period T r (30 minutes) or longer.

[0043] At this time, the condition determination unit 71 determines whether the period during which the condition data is in the predetermined state is equal to or longer than the predetermined reference period T r The combustion pressure data extraction unit 72 extracts the third combustion pressure data (combustion pressure data acquired at time t3) from the combustion pressure data (four pieces of data) acquired during the period in which the condition is satisfied as the combustion pressure data to be transmitted to the management device 3. In other words, when the variance V satisfies the condition, First acquisition timing from 20 minutes In this manner, the combustion pressure data extraction unit 72 extracts the combustion pressure data after the reference period T r The extraction start time (from the first acquisition timing that satisfies the condition) is determined in advance based on the start time (time t1) of 20 t3) from the time t3 minutes later during the specified extraction period T e Combustion pressure data of the internal combustion engine 5 in the above-mentioned manner is extracted.

[0044] The timing for extracting the combustion pressure data is the reference period T d For example, the extraction timing may be determined according to the characteristics of the internal combustion engine 5 of the ship 4 (for example, the period from when the load changes until the load stabilizes, etc.). Furthermore, the reference period T d The combustion data may be extracted at a plurality of timings within the above range.

[0045] Extraction period T eis the period during which the crank angle of the internal combustion engine 5 changes from a predetermined start angle to a predetermined end angle. In this embodiment, the angle range from the start angle to the end angle is, for example, 360° (one cycle in a two-stroke engine), as shown in the bottom graph of Fig. 3. Note that in the graph of Fig. 3, 0° is set when the piston 14 is at the top dead center, and the angle range is from -180° to 180° based on this.

[0046] The extracted combustion pressure data is a set of combustion pressure values ​​for each predetermined angle unit. For example, when the extraction period is 360° and the angle unit is 0.5°, 720 data elements are extracted.

[0047] The combustion pressure data extraction unit 72 extracts combustion pressure data for at least one cylinder 11 designated in advance among the multiple cylinders 11 of the engine 10 .

[0048] The signal generating unit 73 generates a data transmission signal for transmitting the extracted combustion pressure data to the management device 3. The data transmission signal may include the extracted combustion pressure data and associated data. The associated data may include, for example, the identification number of the internal combustion engine 5, data on the date and time when the combustion pressure data to be transmitted was extracted, information on the load at the time of extraction (actual value, average value, variance value, etc.). The associated data may also include information on the cylinder 11 from which the combustion pressure data was extracted (such as the identification number of the specified cylinder 11). Alternatively, the extracted cylinder 11 may be treated as the combustion pressure data of the engine 10 without distinguishing between them.

[0049] Also, the combustion pressure data extracting unit 72 may extract combustion pressure data for two or more cylinders 11 out of the plurality of cylinders 11, and the signal generating unit 73 may average these data to generate one combustion pressure data.

[0050] According to the above configuration, when the predetermined condition data related to the internal combustion engine 5 satisfies a predetermined condition, the combustion pressure data of the internal combustion engine 5 for at least a part of the period during which the condition is satisfied is extracted. Therefore, the combustion pressure data when the internal combustion engine 5 is in a predetermined state is transmitted. This makes it possible to transmit combustion pressure data that matches the condition to be analyzed by the management device 3. As described above, it is possible to reduce the amount of data transmitted from the ship 4 to the land via satellite communication while ensuring that the data content enables the land-based management device 3 to appropriately monitor the state of the internal combustion engine 5 installed in the ship 4.

[0051] Furthermore, according to the above configuration, the period during which the internal combustion engine 5 is in a predetermined state is equal to or longer than the predetermined reference period T r If the above condition continues, the combustion pressure data of the internal combustion engine 5 is extracted. Therefore, it is possible to transmit the combustion pressure data when the internal combustion engine 5 is stable in that state. This makes it possible to extract more appropriate combustion pressure data that matches the condition to be analyzed by the management device 3. In addition, by performing condition determination based on the variance of the condition data, it is possible to transmit the combustion pressure data related to the state of the internal combustion engine 5 to be analyzed by the management device 3 while allowing a certain degree of disturbance.

[0052] In addition, by determining the condition using data that changes depending on the load of the internal combustion engine 5 as the condition data, it is possible to transmit the combustion pressure data when the internal combustion engine 5 is in a predetermined load state. In addition, the period T during which the crank angle of the internal combustion engine becomes a predetermined start angle to a predetermined end angle is e By extracting the combustion pressure data, it is possible to transmit the combustion pressure data in a specific state (scavenging, compression, combustion, exhaust, etc.) of the internal combustion engine 5.

[0053] In this embodiment, the combustion pressure data extraction unit 72 includes a data interpolation unit 75. The data interpolation unit 75 determines whether or not there is a missing portion in the extracted combustion pressure data, and if there is a missing portion, it interpolates the data of the missing portion from the data before and after the missing portion. As described above, the combustion pressure data extracted in this embodiment is configured as a set of combustion pressure values ​​for each predetermined angle unit. If the combustion pressure value at a certain crank angle in a portion of the combustion pressure data cannot be obtained for some reason, the data interpolation unit 75 interpolates from the combustion pressure values ​​at crank angles before and after the crank angle in the missing data element. As a method of data interpolation, an appropriate interpolation method is adopted from among known interpolation methods, such as linear interpolation.

[0054] In this way, even if the extracted combustion pressure data is partially missing, by performing data interpolation in advance at the sender of the combustion pressure data (ship 4 side), it becomes unnecessary to separately send information (data) indicating the presence of missing data to the management device 3. Also, it is possible to eliminate the rejection of data due to partial missing data in the management device 3, and to efficiently transmit valid combustion pressure data.

[0055] In this embodiment, the condition determination unit 71 has a condition setting unit 74 capable of changing the setting of the condition. For example, the condition can be set and input in an input device (not shown) to the data transmission device 7. The condition setting unit 74 sets the condition based on the contents of the input by the input device.

[0056] In addition to this, or instead of this, the condition setting unit 74 may automatically select and set one condition from a plurality of conditions previously stored in a storage unit or the like. For example, loads of 70%, 50%, and 30% may be set as a plurality of conditions, and after a first condition (e.g., load 70%) is satisfied and the combustion pressure data extraction unit 72 extracts the combustion pressure data at that time, the condition setting unit 74 may change the condition to a second condition (e.g., load 50%). In this way, the conditions may be configured to be switched in order as soon as the combustion pressure data under the currently set condition is extracted.

[0057] Furthermore, the condition setting unit 74 may make a judgment for a plurality of conditions in parallel. In this case, the condition judgment unit 71 judges that the condition is satisfied when the load is, for example, any of 70%, 50%, and 30%. The signal generation unit 73 generates a data transmission signal including the extracted combustion pressure data and the condition content at that time (information on which of the plurality of conditions is satisfied).

[0058] Of course, the condition setting unit 74 may maintain the previous conditions in order to extract combustion pressure data multiple times under the same conditions.

[0059] In this way, by allowing various conditions to be set, combustion pressure data in a plurality of states of the internal combustion engine 5 can be easily extracted and transmitted.

[0060] Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various improvements, changes, and modifications are possible without departing from the spirit of the present invention.

[0061] For example, in the above embodiment, the condition for the judgment in the condition judgment unit 71 is that the period during which the condition data (the variance) is within a predetermined threshold range is a predetermined reference period T r Although an example is shown in which the condition is set to continue for more than 100 seconds, the condition is not limited to this. For example, the condition for judgment may include at least one of the following: the value of the condition data in the reference period is within a predetermined threshold range; the average value, variance, standard deviation, or coefficient of variation of the condition data in the reference period is within a predetermined threshold range; and the number of times the condition data falls outside the predetermined threshold range in the reference period is within a predetermined number of times. Note that the standard deviation is given by the square root of the variance, and the coefficient of variation is given by dividing the standard deviation by the average value.

[0062] In the above embodiment, the angle range of the crank angle in the extracted combustion pressure data is 360°, but this is not limited to this. For example, the angle range may be less than 360°, 360° (one cycle), or greater than 360°. When the angle range is greater than 360°, X (X≧2) cycles of combustion pressure data may be extracted as is, or X cycles may be extracted and the combustion pressure data for one cycle averaged for each angle may be transmitted as the combustion pressure data. In this way, the amount of transmission can be reduced by averaging the combustion pressure data for X cycles.

[0063] In the above embodiment, the data transmission signal generated by the signal generating unit 73 of the data transmission device 7 is transmitted to the extravehicular communication unit 8, which then transmits data to the land-based management device 3 via satellite communication. However, the data transmission device 7 may directly transmit data to the land-based management device 3 via satellite communication. In other words, the data transmission device 7 may be provided with an extravehicular communication unit that performs satellite communication.

[0064] Furthermore, the internal combustion engine 5 from which the combustion pressure data can be extracted is not particularly limited as long as it is a combustion engine installed in the ship 4. For example, the internal combustion engine 5 may include internal combustion engines for various purposes, such as a main engine for propulsion, various auxiliary engines, and an internal combustion engine for onboard power generation. [Industrial Applicability]

[0065] The present invention is useful for providing a combustion pressure data transmission device, a ship-to-shore communication system equipped with the same, and a combustion pressure data transmission method that can reduce the amount of data transmitted from the ship to shore via satellite communication while providing data content that enables a management device on land to properly monitor the status of an internal combustion engine installed on a ship. [Explanation of symbols]

[0066] 1 Ship-to-shore communication system 3 Management device 4 Ships 5. Internal combustion engine 7 Data transmitter (combustion pressure data transmitter) 71 Condition judgment section 72 Combustion pressure data extraction section 73 Signal Generator 74 Condition setting section 75 Data Interpolation Section

Claims

1. A combustion pressure data transmitting device provided on a ship for transmitting combustion pressure data of an internal combustion engine provided on the ship using a ship-to-shore communication system that transmits data from the ship to a management device on land via satellite communication, comprising: a condition determination unit that obtains predetermined condition data related to the internal combustion engine and different from the combustion pressure data, and determines whether the condition data satisfies a predetermined condition; a combustion pressure data extraction unit that extracts combustion pressure data of the internal combustion engine during at least a part of an extraction period during which the condition is satisfied; a signal generating unit that generates a data transmission signal for transmitting the extracted combustion pressure data to the management device; the condition data is data that changes due to a change in load on the internal combustion engine, The combustion pressure data extraction unit periodically acquires the combustion pressure data at a predetermined data acquisition interval, the condition determination unit determines that the condition is satisfied when a state in which a variance, a standard deviation, or a coefficient of variation of the condition data acquired during a period determined by the data acquisition interval of the combustion pressure data is within a predetermined threshold range continues for the reference period or longer, The combustion pressure data extraction unit extracts combustion pressure data for at least a portion of the combustion pressure data acquired during a period in which the condition is satisfied, the combustion pressure data for the extraction period being shorter than the data acquisition interval, for transmission to the management device.

2. 2. The combustion pressure data transmitting device according to claim 1, wherein the extraction period is a period from a predetermined start angle to a predetermined end angle of the crank angle of the internal combustion engine.

3. 3. The combustion pressure data transmitting device according to claim 1, wherein the condition data includes at least one of engine load data, engine speed data, fuel injection amount data, engine load command value data, engine speed command value data, fuel injection amount command value data, and turbocharger speed data.

4. 4. The combustion pressure data transmitting device according to claim 1, wherein the combustion pressure data extracting unit determines whether or not the extracted combustion pressure data is missing, and if there is a missing portion, has a data interpolating unit that interpolates data of the missing portion from data before and after the missing portion.

5. 5. The combustion pressure data transmitting device according to claim 1, wherein the condition determining section has a condition setting section that is capable of changing the setting of the condition.

6. The internal combustion engine includes a plurality of cylinders.

6. The combustion pressure data transmitting device according to claim 1, wherein the combustion pressure data extracting unit extracts the combustion pressure data for at least one cylinder designated in advance among the plurality of cylinders.

7. A combustion pressure data transmitting device according to any one of claims 1 to 6, a management device that is provided on land and transmits and receives data to and from the combustion pressure data transmitting device via satellite communication.

8. A combustion pressure data transmission method for transmitting combustion pressure data of an internal combustion engine provided on a ship using a ship-to-shore communication system for transmitting data from a ship to a management device on land via satellite communication, comprising the steps of: The combustion pressure data is periodically acquired at a predetermined data acquisition interval. acquiring data relating to the internal combustion engine, the data being changed due to a load change of the internal combustion engine as predetermined condition data different from the combustion pressure data, and determining whether or not the condition data satisfies a predetermined condition; determining that the condition is satisfied when a state in which a variance, a standard deviation, or a coefficient of variation of the condition data acquired during a period determined by the data acquisition interval of the combustion pressure data is within a predetermined threshold range continues for more than the reference period; extracting combustion pressure data of the internal combustion engine during an extraction period that is shorter than the data acquisition interval from the combustion pressure data acquired during a period in which the condition is satisfied; generating a data transmission signal for transmitting the extracted combustion pressure data to the management device; A combustion pressure data transmission method, comprising: transmitting the data transmission signal to the management device.

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