CN109981742B - Ship-engine emission data and ship equipment online monitoring system and method - Google Patents

Ship-engine emission data and ship equipment online monitoring system and method Download PDF

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CN109981742B
CN109981742B CN201910141565.4A CN201910141565A CN109981742B CN 109981742 B CN109981742 B CN 109981742B CN 201910141565 A CN201910141565 A CN 201910141565A CN 109981742 B CN109981742 B CN 109981742B
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金华标
荣致远
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Wuhan University of Technology WUT
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    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
    • G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
    • H—ELECTRICITY
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    • H04L67/025—Protocols based on web technology, e.g. hypertext transfer protocol [HTTP] for remote control or remote monitoring of applications
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
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    • H04L67/01—Protocols
    • H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
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    • H04W12/04—Key management, e.g. using generic bootstrapping architecture [GBA]
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    • H04W—WIRELESS COMMUNICATION NETWORKS
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Abstract

The invention discloses an online monitoring system for ship-engine emission data and ship equipment, which comprises a ship environment temperature and humidity sensor, a ship engine state sensor, a ship emission data sensor, a GPS module, a camera, a data acquisition module, a main control module, a data encryption module, a wireless data transmission module, an encryption and decoding unit, a key management unit and a client; according to the invention, the ship data is encrypted in real time in the main control module and the data encryption and decryption module and is decrypted on the shore base, so that the safety of the data in the transmission process is ensured. In the invention, the client is connected with the application server, and a crew can monitor the ship through the client. Through the real-time ship information monitoring system, a crew and remote workers can master the running state of a ship in time, so that the information can be acquired more conveniently, and the working efficiency of the crew and shore-based workers is improved.

Description

Ship-engine emission data and ship equipment online monitoring system and method
Technical Field
The invention relates to the technical field of ship data transmission and data processing, in particular to a ship engine emission data and ship equipment online monitoring system and method.
Background
The problem that the exhaust gas discharged by the marine vessel causes atmospheric pollution accounts for 10% of the whole atmospheric pollution source at present, and the exhaust gas becomes one of the very important sources of atmospheric environmental pollution. In ports, straits and partial sea areas with large ship flow and dense air lines, pollutants discharged by ships significantly change the air quality of local areas and regions, and bring serious influence on the atmospheric environment and people's life. The exhaust gas of the marine main engine mainly comprises harmful pollutants such as CO, THC, SOX, NOX, Particulate Matters (PM) and the like. However, at present, no method for rapidly detecting exhaust pollutants of a marine main engine exists in China, and the marine emission cannot be effectively evaluated.
The exhaust gas discharged by the marine diesel engine seriously influences the atmospheric environment and climate change, and the marine diesel engine draws wide attention of the international society. MARPOL convention VI-prevention of air pollution regulations by ships limits the content of sulfur and nitrogen oxides in exhaust gas from ships and prohibits intentional emissions of damaging ozone substances, which convention has also been validated in china. In 'implementation scheme of ship emission control area in water areas of bead triangle, long triangle and Bohai sea (Jingjin Ji)' (Cross sea issue [ 2015 ] 177), issued by department of transportation in 2016), strict control is performed on sulfur oxide emissions in ship exhaust, so far, Chinese also starts measures for controlling exhaust emission in ship emission areas. However, the current monitoring technology level of ships cannot provide an effective real-time monitoring means, most of ships are in port, written fuel conversion programs for checking the ships comprise turbine logs, oil change records or oil records, IAPP certificates, ship fuel spot checks and the like, and the dynamic states of the ships cannot be effectively monitored in real time. The ship tail gas emission detection system in the ship navigation area has incomplete information in detection of various parameter indexes of the ship tail gas, so that certain errors exist in judgment of whether the ship tail gas exceeds the standard. And when the ship is in voyage, other replacing measures such as clean energy, an exhaust aftertreatment mode and the like cannot be used for directly detecting whether the ship exhaust emission exceeds the standard or not. Therefore, the development of novel equipment capable of monitoring ships in real time plays an important role in assisting harbor ship emission inspectors to efficiently and purposefully inspect the ships and maintaining national anti-pollution policies.
Because no complete online monitoring system exists in the field of ships at present, data collected by sensors installed on ships cannot be sorted and transmitted to a shore base in real time. In addition, at present, relevant mechanisms do not have perfect ship online monitoring relevant laws and regulations and do not make efficient data transmission protocols. When a ship sails, shore-based personnel cannot detect ship equipment and emission in the sailing process in real time, cannot predict time nodes of problems of the ship equipment in real time, and can only solve the problems, so that crews can be in a passive position for equipment treatment in the sailing process of the ship.
Disclosure of Invention
The invention aims to provide a ship engine emission data and ship equipment online monitoring system and method, which can monitor ship data in real time, have high data safety and strong stability, and can meet the requirement of mass data transmission by data encryption and decryption.
In order to achieve the purpose, the ship-aircraft emission data and ship equipment online monitoring System comprises a ship environment temperature and humidity sensor, a ship engine state sensor, a ship emission data sensor, a Global Positioning System (GPS) module, a camera, a data acquisition module, a main control module, a data encryption module, a wireless data transmission module, an encryption and decoding unit, a key management unit and a client;
the ship environment temperature and humidity data output end of the ship environment temperature and humidity sensor is connected with the data input end of the data acquisition module, the ship engine state data output end of the ship engine state sensor is connected with the data input end of the data acquisition module, the ship emission data output end of the ship emission data sensor is connected with the data input end of the data acquisition module, the ship GPS data output end of the GPS module is connected with the data input end of the data acquisition module, and the real-time video data output end of a ship cabin of the camera is connected with the data input end of the data acquisition module;
the data acquisition module is used for carrying out analog-to-digital conversion on ship environment temperature and humidity data, ship emission data and exhaust temperature data and engine torque data in ship engine state data to obtain corresponding digital quantity data, and is also used for analyzing engine speed, cooling water temperature, after-cold temperature, engine oil pressure, after-cold pressure, instantaneous oil consumption rate, accumulated oil consumption, accelerator opening, current fault code and historical fault code data in the ship engine state data from a Controller Area Network (CAN) bus, and is also used for analyzing GPS data to obtain ship GPS positioning information;
the main control module is used for packaging all data acquired by the data acquisition module, a physical layer of the packaged data comprises a prefix code, a start mark, data, a check frame, an end mark and a buffer code which are sequentially arranged, and a data format link layer of the packaged data comprises a target address, a ship MMSI (Markime Mobile Service identity), GPS data time, a data type and ship data; the data content link layer of the packed data comprises ship environment temperature and humidity data, ship engine state data, ship emission data, ship GPS data and ship engine room real-time video data;
the key management unit is used for generating an encryption key, the encryption key is transmitted to the data encryption module through the wireless data transmission module and the main control module, the key management unit is also used for transmitting a decryption key corresponding to the encryption key to the encryption and decoding unit, the data encryption module encrypts the packed data output by the main control module through the encryption key, the encrypted packed data is transmitted to the encryption and decoding unit through the main control module and the wireless data transmission module, the encryption and decoding unit decrypts the packed data through the corresponding decryption key, and the encryption and decoding unit is also used for re-encrypting the decoded packed data according to the encryption requirement of a user and transmitting the re-encrypted data to a client for decryption of the user.
The system is characterized by further comprising an expansion module, wherein the expansion module comprises an expansion control panel, an audible and visual alarm module, a local FLASH storage module (FLASH memory) and a touch display screen, an expansion data communication end of the expansion control panel is connected with an expansion data communication end of the main control module, an alarm signal communication end of the expansion control panel is connected with a communication end of the audible and visual alarm module, a data storage end of the expansion control panel is connected with a storage end of the local FLASH storage module, and a touch display signal communication end of the expansion control panel is connected with a communication end of the touch display screen.
A ship engine emission data and ship equipment online monitoring method using the system is characterized by comprising the following steps:
step 1: the data acquisition module respectively acquires ship environment temperature and humidity data sensed by a ship environment temperature and humidity sensor, ship engine state data sensed by a ship engine state sensor, ship emission data sensed by a ship emission data sensor, ship GPS data sensed by a GPS module and ship cabin real-time video data shot by a camera in real time;
step 2: the data acquisition module performs analog-to-digital conversion on ship environment temperature and humidity data, ship emission data and exhaust temperature data and engine torque data in ship engine state data to obtain corresponding digital quantity data, the data acquisition module analyzes the engine speed, cooling water temperature, after-cold temperature, engine oil pressure, after-cold pressure, instantaneous oil consumption rate, accumulated oil consumption, accelerator opening, current fault code and historical fault code data in the ship engine state data from a CAN bus, and the data acquisition module analyzes GPS data to obtain ship GPS positioning information;
and step 3: the main control module packs all data collected by the data collection module, a physical layer of the packed data comprises a prefix code, a start mark, data, a check frame, an end mark and a buffer code which are sequentially arranged, and a data format link layer of the packed data comprises a target address, a ship MMSI code, GPS data time, a data type and ship data; the data content link layer of the packed data comprises ship environment temperature and humidity data, ship engine state data, ship emission data, ship GPS data and ship engine room real-time video data;
and 4, step 4: the key management unit generates an encryption key, the encryption key is transmitted to the data encryption module through the wireless data transmission module and the main control module, the key management unit transmits a decryption key corresponding to the encryption key to the encryption and decoding unit, the data encryption module encrypts the packed data output by the main control module through the encryption key, the encrypted packed data is transmitted to the encryption and decoding unit through the main control module and the wireless data transmission module, the encryption and decoding unit decrypts the packed data through the corresponding decryption key, the encryption and decoding unit is further used for re-encrypting the decoded packed data according to the encryption requirements of users and transmitting the encrypted data to a client for decryption, and the users realize online monitoring on ship emission data and ship equipment through the obtained decrypted packed data.
The mode of the key management unit generating the encryption key is as follows:
Figure BDA0001978676420000051
wherein t is UTC (coordinated universal time) time of GPRMC (recommended positioning information) in GPS data, VesselnFor the MMSI code corresponding to the ship, Rnd () is a random function, which generates a random decimal of (0,1), h () is a hash algorithm,
Figure BDA0001978676420000054
an encryption key generated for the key management unit;
the encryption and decoding unit symmetrically encrypts the packed data according to a formula and transmits the encrypted data to the client side according to a secret key, L () is a decryption function, and the client side decrypts the received encrypted data according to a formula (3);
Figure BDA0001978676420000052
Figure BDA0001978676420000053
wherein F () is an encryption function, PVFor packing data, CVFor the encrypted packed data, L () is a decryption function corresponding to the encryption function, MVIs the decrypted packed data.
The invention has the beneficial effects that:
according to the invention, the ship data is encrypted in real time in the main control module and the data encryption and decryption module and is decrypted on the shore base, so that the safety of the data in the transmission process is ensured.
In the invention, the ship data is simultaneously compressed in real time in the main control module and decompressed on the shore base, so that a data transmission channel is saved, and more effective data can be transmitted under the same transmission frequency.
In the invention, the collected ship speed, course, positioning information, emission data and video monitoring are transmitted to a ship cab through the Ethernet and presented through the touch display screen. The crew can check and adjust the equipment in time according to the obtained information, and can give an audible and visual alarm to the crew when the ship equipment breaks down, discharges abnormally or deviates from the course and the like, so that the safety coefficient of the ship is greatly improved.
In the invention, shore-based workers can obtain the operation trend of each ship device after data analysis of the application server, predict the possible problems of the device, maintain the device in advance, reduce the maintenance cost of the device and improve the personal safety of the crew.
In the invention, the client is connected with the application server, and a crew can monitor the ship through the client such as a computer, a mobile phone, a tablet and the like. Through the real-time ship information monitoring system, a crew and remote workers can master the running state of a ship in time, so that the information can be acquired more conveniently, and the working efficiency of the crew and shore-based workers is improved.
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FIG. 1 is a block diagram of the system architecture of the present invention;
FIG. 2 is a diagram illustrating a data structure according to the present invention;
the system comprises a data acquisition end 10, a ship environment temperature and humidity sensor 11, a GPS module 12, a camera 13, a ship engine state sensor 14, a ship emission data sensor 15, a data acquisition module 20, a main control module 30, a data encryption module 40, a wireless data transmission module 50, an expansion module 60, an expansion control panel 61, an acousto-optic alarm module 62, a local FLASH storage module 63, a touch display screen 64, an application server 70, an application server 71, an encryption and decoding unit 72, a key management unit 80 and a client.
Detailed Description
The invention is described in further detail below with reference to the following figures and specific examples:
as shown in fig. 1, the system for monitoring ship-aircraft emission data and ship equipment on-line includes a ship environment temperature and humidity sensor 11, a ship engine state sensor 14, a ship emission data sensor 15, a GPS module 12, a camera 13, a data acquisition module 20, a main control module 30, a data encryption module 40, a wireless data transmission module 50, an encryption and decoding unit 71, a key management unit 72 and a client 80;
a ship environment temperature and humidity data output end of the ship environment temperature and humidity sensor 11 is connected with a data input end of the data acquisition module 20, a ship engine state data output end of the ship engine state sensor 14 is connected with a data input end of the data acquisition module 20, a ship emission data output end of the ship emission data sensor 15 is connected with a data input end of the data acquisition module 20, a ship GPS data output end of the GPS module 12 is connected with the data input end of the data acquisition module 20 through serial port communication, and a ship cabin real-time video data output end of the camera 13 is connected with the data input end of the data acquisition module 20 through Ethernet communication;
the data acquisition module 20 is used for performing analog-to-digital conversion on ship environment temperature and humidity data, ship emission data and exhaust temperature data and engine torque data in ship engine state data to obtain corresponding digital quantity data, the data acquisition module 20 is further used for analyzing engine rotating speed, cooling water temperature, after-cold temperature, engine oil pressure, after-cold pressure, instantaneous oil consumption rate, accumulated oil consumption, accelerator opening, current fault codes and historical fault code data in the ship engine state data from a CAN bus according to a J1939 protocol, the data acquisition module 20 is further used for analyzing GPS data to obtain ship GPS positioning information according to a NMEA-0183 standard format, and the data acquisition module CAN access different signals of various devices and analyze and arrange the data into fixed data;
the main control module 30 is configured to perform a packing process on all data acquired by the data acquisition module 20 through a field CAN bus and an ethernet bus, a physical layer of the packed data includes a preamble, a start flag, data, a check frame, an end flag, and a buffer code, which are sequentially arranged, and a data format link layer of the packed data includes a target address, a ship MMSI code, GPS data time, a data type, and ship data, as shown in fig. 2; the data content link layer of the packed data comprises ship environment temperature and humidity data, ship engine state data, ship emission data, ship GPS data and ship engine room real-time video data; the marine mobile communication service identification code is transmitted by a ship radio communication system on a radio channel of the marine mobile communication service identification code, and can uniquely identify a row of nine-digit digital codes of various stations and group calling stations; the target address is the address code of the shore-based receiving platform, the MMSI code of the ship is the ship water movement identification code and is used for identifying which ship the data transmitted in the link comes from, the GPS data time is acquired from the UTC time of the GPRMC in the GPS data and is used for calibrating the time for acquiring parameters, and the classification, arrangement and analysis are convenient. The data type specifies the format and length of the ship data in the data frame. The vessel data includes vessel positioning, emissions data, equipment status, video images, and alarm status. In order to avoid data waste caused by invalid data transmission in fixed data format transmission, a dynamic data format is adopted, a corresponding data format type is changed according to a data type of an access physical layer, and the data format indicates that a shore-based platform is convenient to perform targeted processing on data. The set transmission format is set, so that the stability of data transmission and analysis can be ensured, packet loss and confusion during transmission can be prevented, the corresponding data format can be set according to different access equipment, and resources occupied by data transmission can be saved.
The transmission of the packetized data is performed using time division multiple access, which divides the time of the communication signal into fixed time intervals. Each physical layer data occupies a time gap.
The key management unit 72 of the application server 70 is configured to generate an encryption key, and then transmit the encryption key to the data encryption module 40 through the wireless data transmission module 50 and the main control module 30 (the wireless data transmission module 50 is connected to the main control module 30 through a USB bus, and the main control module 30 is connected to the data encryption module 40 through a USB bus), the key management unit 72 is further configured to transmit a decryption key corresponding to the encryption key to the encryption and decryption unit 71 of the application server 70, the data encryption module 40 encrypts the packaged data output by the main control module 30 through the encryption key, the encrypted packet data is transmitted to the encryption and decoding unit 71 through the main control module 30 and the wireless data transmission module 50, the encryption and decoding unit 71 decrypts the packet data through the corresponding decryption key, and the encryption and decoding unit 71 is further configured to re-encrypt the decoded packet data according to the encryption requirement of the user and transmit the re-encrypted packet data to the client 80 for decryption by the user. The wireless data transmission module 50 transmits data by using a TCP/IP (transmission control Protocol/internet Protocol) Protocol or a UDP (User Datagram Protocol) Protocol. Data encryption can ensure safety in data transmission and prevent data leakage caused by packet capturing.
In the technical scheme, the ship environment temperature and humidity sensor 11, the ship engine state sensor 14, the ship emission data sensor 15, the GPS module 12 and the camera 13 form a data acquisition end 10. The encryption and decryption unit 71 and the key management unit 72 are located in the application server 70.
In the above technical solution, the manner of generating the encryption key by the key management unit 72 is as follows:
Figure BDA0001978676420000081
wherein t is UTC time of GPRMC in GPS data, VesselnFor the MMSI code corresponding to the ship, Rnd () is a random function, which generates a random decimal of (0,1), h () is a hash algorithm,
Figure BDA0001978676420000093
an encryption key generated by the key management unit 72.
The encryption and decoding unit 71 symmetrically encrypts the packed data according to the secret key by using a formula 2 and transmits the encrypted data to the client 80, wherein L () is a decryption function, and the client 80 decrypts the received encrypted data according to a formula (3);
Figure BDA0001978676420000091
Figure BDA0001978676420000092
wherein F () is an encryption function, PVFor packing data, CVFor the encrypted packed data, L () is a decryption function corresponding to the encryption function, MVIs the decrypted packed data. The decryption method can be used for dynamically encrypting and decrypting data, and a key is generated uniformly by the shore-based platform, so that the key is convenient to manage. The dynamic key increases the difficulty of decryption.
In the above technical solution, the ship emission data includes the concentration of NOX and SO emitted by the ship2Concentration, H2S concentration, O2Concentration, CO2Concentration, CO concentration and HC concentration.
In the above technical solution, the mobile phone further comprises an expansion module 60, the expansion module 60 comprises an expansion control board 61, an audible and visual alarm module 62, a local FLASH storage module 63 and a touch display screen 64, an expansion data communication end of the expansion control board 61 is connected with an expansion data communication end of the main control module 30 through an ethernet bus, an alarm signal communication end of the expansion control board 61 is connected with a communication end of the audible and visual alarm module 62, a data storage end of the expansion control board 61 is connected with a storage end of the local FLASH storage module 63, and a touch display signal communication end of the expansion control board 61 is connected with a communication end of the touch display screen 64. When the wireless network of the wireless data transmission module 50 is disconnected, the main control module 30 transmits the packed data to the local flash storage module 63, and when the network is recovered, transmits the data stored in the local flash storage module 63 to the application server 70 to implement the data caching function. When no network coverage exists, the data can be stored in FLASH, and when the network is recovered, the historical data is transmitted to the shore base, so that the data integrity can be ensured.
In the above technical solution, the packed data of the main control module 30 is processed by the expanded control board 61, and the processed result is displayed by the touch display screen 64, and if the processed result indicates that the ship equipment fault exists, the expanded control board 61 performs sound and light alarm by the sound and light alarm module 62.
In the above technical solution, the encryption and decoding unit 71, the key management unit 72, and the client 80 are shore-based devices.
In the above technical solution, the preamble is used for synchronization of a time slot, and marks the beginning of data of a time slot of a physical layer; the data part is the packed data, the frame check adopts the cyclic redundancy check, the buffer code plays the roles of delay compensation and data filling, and the end mark is used for indicating the end of the data.
A ship engine emission data and ship equipment online monitoring method using the system is characterized by comprising the following steps:
step 1: the data acquisition module 20 respectively acquires ship environment temperature and humidity data sensed by the ship environment temperature and humidity sensor 11, ship engine state data sensed by the ship engine state sensor 14, ship emission data sensed by the ship emission data sensor 15, ship GPS data sensed by the GPS module 12 and real-time video data of a ship engine room shot by the camera 13 in real time;
step 2: the data acquisition module 20 performs analog-to-digital conversion on ship environment temperature and humidity data, ship emission data and exhaust temperature data and engine torque data in ship engine state data to obtain corresponding digital quantity data, the data acquisition module 20 analyzes the engine speed, cooling water temperature, after-cold temperature, engine oil pressure, after-cold pressure, instantaneous oil consumption rate, accumulated oil consumption, accelerator opening, current fault code and historical fault code data in the ship engine state data from a CAN bus, and the data acquisition module 20 analyzes GPS data to obtain ship GPS positioning information;
and step 3: the main control module 30 packages all the data acquired by the data acquisition module 20, a physical layer of the packaged data comprises a preamble, a start mark, data, a check frame, an end mark and a buffer code which are sequentially arranged, and a data format link layer of the packaged data comprises a target address, a ship MMSI code, GPS data time, a data type and ship data; the data content link layer of the packed data comprises ship environment temperature and humidity data, ship engine state data, ship emission data, ship GPS data and ship engine room real-time video data;
and 4, step 4: the key management unit 72 generates an encryption key, the encryption key is transmitted to the data encryption module 40 through the wireless data transmission module 50 and the main control module 30, the key management unit 72 transmits a decryption key corresponding to the encryption key to the encryption and decoding unit 71, the data encryption module 40 encrypts the packed data output by the main control module 30 through the encryption key, the encrypted packed data is transmitted to the encryption and decoding unit 71 through the main control module 30 and the wireless data transmission module 50, the encryption and decoding unit 71 decrypts the packed data through the corresponding decryption key, the encryption and decoding unit 71 is further used for re-encrypting the decoded packed data to the client 80 according to the encryption requirement of the user for decryption, and the user realizes online monitoring of the ship emission data and the ship equipment through the obtained decrypted packed data.
The application server 70 performs data mining processing to redefine and summarize data and information to generate a rule base, so that real-time performance of fault diagnosis is achieved, fault reasons are quickly located, and finally the data and the information are fed back to a ship corresponding to the damaged equipment (reference documents are shown in [1] Xiaoliuguang, design and implementation of a distributed SQL database based on MySQL [ D ]. university of Chinese academy of sciences (academy of engineering and information technology), 2016 [2] Sunzheng, research on ship navigation efficiency of inland container ships based on track big data [ D ]. Chongqing transport university, 2018.), and meanwhile, the client 74 accesses the application server to achieve query of shipping logistics information;
the client 74 reads the remaining life data of each component of the cabin equipment in the SQL database in the application server, calculates the specific maintenance time of the component according to different situation maintenance decision models, and finally makes a maintenance plan through the maintenance spare part information management module and displays the result through the client.
The key management unit 72 generates the encryption key in the following manner:
Figure BDA0001978676420000111
wherein t is UTC time of GPRMC in GPS data, VesselnFor the MMSI code corresponding to the ship, Rnd () is a random function, which generates a random decimal of (0,1), h () is a hash algorithm,
Figure BDA0001978676420000113
an encryption key generated for the key management unit 72;
the encryption and decoding unit 71 symmetrically encrypts the packed data according to the secret key by using a formula 2 and transmits the encrypted data to the client 80, wherein L () is a decryption function, and the client 80 decrypts the received encrypted data according to a formula (3);
Figure BDA0001978676420000112
Figure BDA0001978676420000121
wherein F () is an encryption function, PVFor packing data, CVFor the encrypted packed data, L () is a decryption function corresponding to the encryption function, MVIs the decrypted packed data.
Details not described in this specification are within the skill of the art that are well known to those skilled in the art.

Claims (8)

1. The utility model provides a system for on-line monitoring ship machine emission data and marine equipment which characterized in that: the system comprises a ship environment temperature and humidity sensor (11), a ship engine state sensor (14), a ship emission data sensor (15), a GPS module (12), a camera (13), a data acquisition module (20), a main control module (30), a data encryption module (40), a wireless data transmission module (50), an encryption and decoding unit (71), a key management unit (72) and a client (80);
a ship environment temperature and humidity data output end of the ship environment temperature and humidity sensor (11) is connected with a data input end of the data acquisition module (20), a ship engine state data output end of the ship engine state sensor (14) is connected with a data input end of the data acquisition module (20), a ship emission data output end of the ship emission data sensor (15) is connected with a data input end of the data acquisition module (20), a ship GPS data output end of the GPS module (12) is connected with a data input end of the data acquisition module (20), and a ship cabin real-time video data output end of the camera (13) is connected with a data input end of the data acquisition module (20);
the data acquisition module (20) is used for carrying out analog-to-digital conversion on ship environment temperature and humidity data, ship emission data, exhaust temperature data and engine torque data in ship engine state data to obtain corresponding digital quantity data, the data acquisition module (20) is also used for analyzing engine rotating speed, cooling water temperature, after-cold temperature, engine oil pressure, after-cold pressure, instantaneous oil consumption rate, accumulated oil consumption, accelerator opening, current fault codes and historical fault code data in the ship engine state data from a CAN bus, and the data acquisition module (20) is also used for analyzing GPS data to obtain ship GPS positioning information;
the main control module (30) is used for packaging all data acquired by the data acquisition module (20), a physical layer of the packaged data comprises a prefix, a start mark, data, a check frame, an end mark and a buffer code which are sequentially arranged, and a data format link layer of the packaged data comprises a target address, a ship MMSI code, GPS data time, a data type and ship data; the data content link layer of the packed data comprises ship environment temperature and humidity data, ship engine state data, ship emission data, ship GPS data and ship engine room real-time video data;
the transmission of the packed data adopts a time division multiple access mode, the time of a communication signal is divided into fixed time gaps, and each physical layer of data occupies one time gap;
the key management unit (72) is used for generating an encryption key, the encryption key is transmitted to the data encryption module (40) through the wireless data transmission module (50) and the main control module (30), the key management unit (72) is also used for transmitting a decryption key corresponding to the encryption key to the encryption and decoding unit (71), the data encryption module (40) encrypts the packed data output by the main control module (30) through the encryption key, the encrypted packed data is transmitted to the encryption and decoding unit (71) through the main control module (30) and the wireless data transmission module (50), the encryption and decoding unit (71) decrypts the packed data through the corresponding decryption key, and the encryption and decoding unit (71) is also used for re-encrypting the decoded packed data according to the encryption requirement of a user and transmitting the encrypted data to the client (80) for decryption by the user;
the wireless data transmission module (50) adopts a TCP/IP protocol or a UDP protocol to transmit data;
the key management unit (72) generates an encryption key by:
Figure FDA0002928483870000021
wherein t is UTC time of GPRMC in GPS data, VesselnFor the MMSI code corresponding to the ship, Rnd () is a random function, which generates a random decimal of (0,1), h () is a hash algorithm,
Figure FDA0002928483870000022
an encryption key generated for a key management unit (72);
the encryption and decoding unit (71) symmetrically encrypts the packed data according to a formula 2 and transmits the encrypted data to the client (80) according to a secret key, L () is a decryption function, and the client (80) decrypts the received encrypted data according to a formula (3);
Figure FDA0002928483870000023
Figure FDA0002928483870000024
wherein F () is an encryption function, PVFor packing data, CVFor the encrypted packed data, L () is a decryption function corresponding to the encryption function, MVIs the decrypted packed data.
2. The system for on-line monitoring of ship engine emissions data and ship equipment of claim 1, wherein: the ship emission data comprises NOx concentration and SO emitted by the ship2Concentration, H2S concentration, O2Concentration, CO2Concentration, CO concentration and HC concentration.
3. The system for on-line monitoring of ship engine emissions data and ship equipment of claim 1, wherein: the portable electronic device is characterized by further comprising an expansion module (60), wherein the expansion module (60) comprises an expansion control panel (61), an audible and visual alarm module (62), a local FLASH storage module (63) and a touch display screen (64), an expansion data communication end of the expansion control panel (61) is connected with an expansion data communication end of the main control module (30), an alarm signal communication end of the expansion control panel (61) is connected with a communication end of the audible and visual alarm module (62), a data storage end of the expansion control panel (61) is connected with a storage end of the local FLASH storage module (63), and a touch display signal communication end of the expansion control panel (61) is connected with a communication end of the touch display screen (64).
4. The system for on-line monitoring of ship engine emissions data and ship equipment of claim 3, wherein: the packed data of the main control module (30) is subjected to data processing by the expanded control panel (61), the processed result is displayed by the touch display screen (64), and if the data processing result shows that the ship equipment fault exists, the expanded control panel (61) performs sound-light alarm by the sound-light alarm module (62).
5. The system for on-line monitoring of ship engine emissions data and ship equipment of claim 3, wherein: the encryption and decoding unit (71), the key management unit (72) and the client (80) are shore-based equipment.
6. The system for on-line monitoring of ship engine emissions data and ship equipment of claim 1, wherein: the preamble is used for time slot synchronization and marks the beginning of one time slot data of a physical layer; the data part is the packed data, the frame check adopts the cyclic redundancy check, the buffer code plays the roles of delay compensation and data filling, and the end mark is used for indicating the end of the data.
7. A method for on-line monitoring of ship engine emissions data and ship equipment using the system of claim 1, comprising the steps of:
step 1: the data acquisition module (20) respectively acquires ship environment temperature and humidity data sensed by a ship environment temperature and humidity sensor (11), ship engine state data sensed by a ship engine state sensor (14), ship emission data sensed by a ship emission data sensor (15), ship GPS data sensed by a GPS module (12) and ship cabin real-time video data shot by a camera (13) in real time;
step 2: the data acquisition module (20) performs analog-to-digital conversion on ship environment temperature and humidity data, ship emission data and exhaust temperature data and engine torque data in ship engine state data to obtain corresponding digital quantity data, the data acquisition module (20) analyzes the engine speed, the cooling water temperature, the after-intercooling temperature, the engine oil pressure, the after-intercooling pressure, the instantaneous oil consumption rate, the accumulated oil consumption, the accelerator opening degree, the current fault code and historical fault code data in the ship engine state data from a CAN bus, and the data acquisition module (20) analyzes the GPS data to obtain ship GPS positioning information;
and step 3: the main control module (30) packs all data collected by the data collection module (20), a physical layer of the packed data comprises a prefix code, a start mark, data, a check frame, an end mark and a buffer code which are sequentially arranged, and a data format link layer of the packed data comprises a target address, a ship MMSI code, GPS data time, a data type and ship data; the data content link layer of the packed data comprises ship environment temperature and humidity data, ship engine state data, ship emission data, ship GPS data and ship engine room real-time video data;
and 4, step 4: the key management unit (72) generates an encryption key, then the encryption key is transmitted to the data encryption module (40) through the wireless data transmission module (50) and the main control module (30), the key management unit (72) transmits a decryption key corresponding to the encryption key to the encryption and decoding unit (71), the data encryption module (40) encrypts the packaged data output by the main control module (30) through the encryption key, the encrypted packed data are transmitted to an encryption and decoding unit (71) through a main control module (30) and a wireless data transmission module (50), the encryption and decoding unit (71) decrypts the packed data through a corresponding decryption key, the encryption and decoding unit (71) is further used for re-encrypting the decoded packed data according to the encryption requirements of users and transmitting the encrypted data to a client (80) for decryption by the users, and the users realize online monitoring of ship emission data and ship equipment through the obtained decrypted packed data.
8. The method for on-line monitoring of ship engine emissions data and ship equipment of claim 7, wherein: the key management unit (72) generates an encryption key by:
Figure FDA0002928483870000051
wherein t is UTC time of GPRMC in GPS data, VesselnFor the MMSI code corresponding to the ship, Rnd () is a random function, which generates a random decimal of (0,1), h () is a hash algorithm,
Figure FDA0002928483870000052
an encryption key generated for a key management unit (72);
the encryption and decoding unit (71) symmetrically encrypts the packed data according to a formula 2 and transmits the encrypted data to the client (80) according to a secret key, L () is a decryption function, and the client (80) decrypts the received encrypted data according to a formula (3);
Figure FDA0002928483870000053
Figure FDA0002928483870000054
wherein F () is an encryption function, PVFor packing data, CVFor the encrypted packed data, L () is a decryption function corresponding to the encryption function, MVIs the decrypted packed data.
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