CN106644492A - Marine middle-and-low-speed diesel engine cylinder pressure online monitoring system based on FPGA - Google Patents
Marine middle-and-low-speed diesel engine cylinder pressure online monitoring system based on FPGA Download PDFInfo
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- CN106644492A CN106644492A CN201610871926.7A CN201610871926A CN106644492A CN 106644492 A CN106644492 A CN 106644492A CN 201610871926 A CN201610871926 A CN 201610871926A CN 106644492 A CN106644492 A CN 106644492A
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- cylinder pressure
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- monitoring system
- diesel engine
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
- G01M15/05—Testing internal-combustion engines by combined monitoring of two or more different engine parameters
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
- G01M15/08—Testing internal-combustion engines by monitoring pressure in cylinders
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention discloses a marine middle-and-low-speed diesel engine cylinder pressure online monitoring system based on an FPGA. The system comprises sensors, a signal conditioning unit, an acquisition control unit and an upper computer. The sensors comprise an upper stop point sensor, a crankshaft rotating angle sensor and a cylinder pressure sensor. The acquisition control unit acquires multiple cylinder pressure signals through a synchronous equal crankshaft rotating angle which is triggered by an upper stop point and a crankshaft rotating angle pulse, and furthermore performs preprocessing. The upper computer performs analytical processing and comparison through reading preprocessed cylinder pressure data, and furthermore displays an indicator diagram of each cylinder. The marine middle-and-low-speed diesel engine cylinder pressure online monitoring system settles a problem of integrating techniques of multiple-cylinder in-cylinder pressure synchronous equal crankshaft rotating angle measurement, wire breakage monitoring, preprocessing, cylinder pressure characteristic parameter calculation, comparison display, Ethernet data transmission and the like in a marine middle-and-low-speed diesel engine. The marine middle-and-low-speed diesel engine cylinder pressure online monitoring system further has advantages of sufficiently utilizing a hardware resource, improving integrated level and reliability of the system, saving cost, realizing high expandability, and supplying an effective facility for online performance monitoring of the marine middle-and-low-speed diesel engine.
Description
Technical field
The present invention relates to diesel engine performance monitoring technical field, more particularly to a kind of mid low speed diesel fuel peculiar to vessel based on FPGA
Machine cylinder pressure on-line monitoring system.
Background technology
Cylinder Pressure of Diesel Engine indicator card is the important parameter for describing working condition in cylinder of diesel engine.Measurement cylinder pressure shows
The essence of work(figure be measurement cylinder in gas pressure with time (or crank angle, volume of cylinder) change procedure, using cylinder pressure
Power indicator card can study combustion process in cylinder of diesel engine, gas and casing wall diabatic process, breathing action and extract failure
Information is used for Diagnosis of Diesel state.
On-line measurement, cylinder pressure show while cylinder pressure on-line monitoring system is capable of achieving diesel engine multiple cylinder pressures
Work(figure and characteristic parameter show, is easy to working state monitoring and fault diagnosis in technical staff real time contrast analysis cylinder, therefore opens
Sending out mid low speed diesel fuel machine cylinder pressure on-line monitoring system peculiar to vessel a set of has engineering application value.
The content of the invention
The technical problem to be solved in the present invention is for defect of the prior art, there is provided a kind of based on the peculiar to vessel of FPGA
Mid low speed diesel fuel machine cylinder pressure on-line monitoring system.
The technical solution adopted for the present invention to solve the technical problems is：A kind of mid low speed diesel fuel machine peculiar to vessel based on FPGA
Cylinder pressure on-line monitoring system, including：
Sensor, the sensor is included for obtaining the cylinder pressure sensor of cylinder cylinder pressure data, for obtaining bavin
The TDCS TDC Sensor of oil machine top dead centre pulse signal and the CKP for obtaining crankshaft of diesel engine angular signal；
Signal condition unit, the signal condition unit includes that cylinder presses conditioning module and trigger conditioning module, described
Cylinder pressure conditioning module is used to for the output conditioning of cylinder pressure sensors to supply acquisition control list for the voltage signal in the range of 2.5V
Unit's collection；Trigger nurses one's health the TTL signal nursed one's health the signal output of top dead centre and CKP for standard；
Acquisition control unit, the marine diesel multi-cylinder cylinder pressure signal for processing signal condition unit carries out waiting bent axle
Corner synchronous acquisition and pretreatment；The pretreatment includes burn out detection, the judgement of crank-angle pulse distortion point, transient speed meter
Calculate and the cylinder pressure signal period is average；
The grade crank angle synchronous collection method of the acquisition control unit is as follows：In mid low speed diesel fuel machine multi-cylinder cylinder peculiar to vessel
The crank angle synchro measure such as pressure, corner signal accesses a certain global clock pins of FPGA, by other multiple overall situations
Clock pins synchronism output as A/D converter data acquisition trigger, the synchronised clock of A/D converter data output by
Controller FPGA produce, system with top dead centre and corner signal triggering collection, so as to realize diesel engine multi-cylinder cylinder pressure
The crank angle collection such as synchronous.
Host computer, for pressing data by pretreated cylinder, and is analyzed and processed, is calculated cylinder pressure characteristics ginseng
Number, contrast shows each cylinder indicator card.
By such scheme, the cylinder pressure sensor is amperometric sensor, gathers in-cylinder pressure, output 4-20mA electric current letters
Number access conditioning plate conditioning standard TTL signal.
By such scheme, in the acquisition control unit, the road cylinder pressure data acquisition channel of individual unit configuration 6.
By such scheme, the cylinder pressure on-line monitoring system also includes communication module, for realizing collection control
Data transfer between unit processed and host computer.
By such scheme, the cylinder pressure on-line monitoring system includes multiple acquisition control units, each acquisition control list
Collection, corner signal triggering collection are started by same top dead centre signal between unit.
The beneficial effect comprise that：
1. the present invention is with FPGA as controller, using the logic editable inside FPGA, the configurable parallel structure of I/O modules
Frame, carries out waiting crank angle synchronous acquisition and pretreatment to marine diesel multi-cylinder cylinder pressure signal, simple with circuit design,
The features such as PCB surface accumulates few, the stability of a system is high.
2. the present invention enters line sensor burn out detection and carries out distortion point inspection to corner signal with FPGA as controller
Survey, improve the engineering site applicability of system.
3. the present invention can simultaneously measure the cylinder pressure indicator card of the multiple cylinders of diesel engine, and each cylinder indicator card of simultaneous display is bent
Line, is easy to monitor each cylinder state of diesel engine on-line.
4. the present invention can pass through to arrange the parametric data that acquisition controller is changed with display unit, improve system
Versatility.
5. the present invention can check that pretreated each cylinder cylinder presses signal by locally located with display unit, be easy to system
Debugging.
Description of the drawings
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing：
Fig. 1 is the system structure diagram of the embodiment of the present invention；
Fig. 2 is the acquisition control unit structural representation of the embodiment of the present invention；
Fig. 3 is the working-flow figure of the embodiment of the present invention.
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention become more apparent, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that specific embodiment described herein is not used to limit only to explain the present invention
The fixed present invention.
As shown in figure 1, the present invention based on the online cylinder pressure test system of FPGA mid low speed diesel fuel machines peculiar to vessel, main bag
Include power supply, sensor, signal condition unit, acquisition control unit, setting and display unit, upper computer software.
It is specific as follows：
Power supply, is input into 24VDC, power supply and standard basis voltage needed for each module of power conversion chip generation system.
Sensor, including cylinder pressure sensor, CKP and TDCS TDC Sensor；Multiple cylinder pressure sensors are installed
On each cylinder indicator valve of diesel engine, current output sensor signal.
Signal condition unit includes that cylinder presses conditioning unit and trigger conditioning unit, and the signal of cylinder pressure conditioning module is successively
Through the process of following circuit module：Current signal converting voltage signal circuit (is directed to current mode cylinder pressure sensors), or
Amplifier (being directed to voltage-type cylinder pressure sensors), filter circuit filter the burr of cylinder pressure signal and distortion, voltage follower
Strengthen the driving force of signal, divider resistance is converted voltage in A/D converter reference voltage range.Trigger nurses one's health mould
The signal of block sequentially passes through following circuit module and processes：Voltage follower circuit strengthens signal driving force, adjustable voltage
The voltage comparator circuit of threshold value, by adjusting the voltage threshold of comparator different top dead centres and CKP are met
The type of output signal, makes trigger conditioning module outputting standard TTL signal, the isolation interference of magnetic couple isolation circuit.
Acquisition control unit is used to that the marine diesel multi-cylinder cylinder pressure signal of signal condition unit process to be carried out waiting bent axle
Corner synchronous acquisition and pretreatment；Fig. 2 is the acquisition control unit structural representation of the embodiment of the present invention；
The crank angle measurement such as diesel engine multi-cylinder in-cylinder pressure synchronization, corner signal accesses a certain global clocks of FPGA
Pin, is triggered by data acquisition of the isometric wiring synchronism output of other multiple global clock pins and PCB as A/D converter
Signal, the synchronised clock of A/D converter data output is produced by controller FPGA, and the cycle is much smaller than the crank angle cycle.System
System above endstop signal starts collection, corner signal triggering collection, so as to realize the synchronization of diesel engine multi-cylinder cylinder pressure
Deng crank angle collection.
A/D converter is that sample rate is in the selectable SPI three-wire systems serial modes of 100-500Kbps using 16 precision
Data output, its sample rate such as much meets at the rate request of crank angle sampling.
Acquisition control unit is configured with DDR3 data buffers, data Jing through serioparallel exchange, after resetting merging bit wide
DDR3 caching after, by corresponding read module read DDR3 data by communication module be sent out to host computer and arrange and
Display unit.
Communication module, including ethernet communication and usb communication, ethernet communication module is by ethernet PHY chip and RJ45
Ethernet interface is constituted, and PHY chip MII or gmii interface are connected with FPGA, and it is fast that Ethernet can be equipped with 100Mbps or 1000Mbps
Rate, usb communication module is made up of USB microcontroller chip and interface.Control main control unit and upper is realized by ethernet communication
Data transfer between the machine of position, realizes main control unit and arranges and the data transfer between display unit by usb communication,
Arrange is used to show each cylinder cylinder pressure indicator card comparison diagram and diesel engine characteristic parameter etc. with display unit, performs
Host computer identical function, can configure the parameter of acquisition control unit, including the diesel engine flywheel number of teeth (by flying under its debugging mode
Tooth number determines the sampling number of a cycle indicator card data), data period average (requires that situation is true according to available accuracy
Fixed how many cycles are average), crank angle frequency etc. (calculates the parameter needed during rotating speed), with suitable for more diesel engines.
Acquisition control unit can carry out cylinder pressure collection, acquisition control list by extension suitable for 6 cylinder above diesel engines
Unit's extension mouth is external from controller when gathering for 6 cylinder above Cylinder Pressure of Diesel Engine, and master-slave unit is based on same top dead centre
Start, same corner signal triggering collection, main acquisition control unit processes the Data Concurrent of collection and delivers to host computer and set
Put and display unit.This method for designing is suitable for the severe bad border such as high temperature, high humility, vibration and electromagnetic interference.
The running LED mainly initializes successfully indicator lamp including DDR3, and the bright representative of red colored lamp is initialized successfully
And it is bright always know power-off or reset, Ethernet data is sent completely the bright sudden strain of a muscle of green light 1 once, and it is bright that usb data is sent completely green light 2
Dodge once, power supply indicator normal condition is bright always, on-line debugging red lamp flass, long-time does not connect bright always of netting twine red light and falls
Netting twine connection etc..
It is described that cylinder pressure collection is carried out suitable for 6 cylinder above diesel engines by extension, mouth is extended by control unit
An external control unit, and one of them is set to from unit, a master unit sends to the data of collection from unit
Master unit, the data wire between master ＆ slave control unit includes power line, top dead centre holding wire, corner signal line, serial number
According to line, condition line and energy line etc. is made.
In acquisition control unit the state of access signal is detected after electricity, signalling channel is accessed per road and is both provided with shape
State indicator lamp, according to the characteristics of sensor signal lines and ground wire composition loop, in the upper electric burn out detection stage, applied a high electricity
It is flat, if during the corresponding input channel of the non-access controller of external sensor output end, LED place circuit cannot constitute path,
All passage indicator lamps all do not work, otherwise are constantly in bright state, until disconnecting, end sensor holding wire are sentenced by this whether
Connection controller, in system operation, top dead centre and corner signal access passage indicator lamp and do not stop flicker, show two biographies
Sensor can receive normal signal, do not flash and show sensor experiences failure if simply bright always.
Acquisition control unit carries out the judgement of crank angle pulse distortion point, and FPGA measures transient speed using high-frequency count method
Pulse period, the requirement to being input into corner signal is higher.Under the conditions of actual ship, signal always produces certain interference,
And affected by the pitch error such as gear surface damage and subdivision analysis gear faying face gap, can draw in the signal of transient speed
Enter partial pulse interference signal, i.e. distortion point, due to the stationarity of Instantaneous Speed Fluctuations, adjacent 2 points of fluctuation of speed difference is not
Certain value should be exceeded, can determine whether it is distortion point according to this feature, system is needed to be rejected distortion point by programming, obtained
To reliable cylinder pressure indicator card.
The cylinder pressure signal period averagely pre-processes, controller by the data of collection do the cycle it is average after from communication module to
Outer transmission, implements the period average that how many cycles are average, configure under debugging mode by setting and display pattern
Parameter.By performance period average in lower computer acquisition controller, can be born with simple light host computer, improve program operational efficiency.
The upper computer software is set to client, and acquisition controller is service end, and upper computer software calls ether Netcom
Letter module realizes the reception and transmission of data with acquisition controller Ethernet, and host computer intercepts always ethernet port, once net
Network is connected (i.e. server end exists with client and couples), the host computer data that just real-time reception is currently gathered, and is analyzed
Process, calculate cylinder pressure characteristics parameter, contrast shows each cylinder indicator card etc., if not coupling for a long time and data volume has exceeded DDR3
Memory capacity, then alarm is sent by indicator lamp and is indicated, and empty DDR3 historical datas, new data is received again.
It is to calculate the current rotating speed of diesel engine by being input into the corner signal of FPGA that the transient speed is calculated.Can pass through
The measurement of equal precision measuring frequency way principle and measuring period method principle programming realization rotating speed.
The working-flow figure of the embodiment of the present invention is as shown in Figure 3.
It should be appreciated that for those of ordinary skills, can according to the above description be improved or be converted,
And all these modifications and variations should all belong to the protection domain of claims of the present invention.
Claims (5)
1. a kind of mid low speed diesel fuel machine cylinder pressure on-line monitoring system peculiar to vessel based on FPGA, including：
Sensor, the sensor is included for obtaining the cylinder pressure sensor of cylinder cylinder pressure data, for obtaining diesel engine
The TDCS TDC Sensor of top dead centre pulse signal and the CKP for obtaining crankshaft of diesel engine angular signal；
Signal condition unit, the signal condition unit includes that cylinder presses conditioning module and trigger conditioning module, the cylinder pressure
Conditioning module is used to adopt the output conditioning of cylinder pressure sensors for acquisition control unit for the voltage signal in the range of 2.5V
Collection；Trigger nurses one's health the TTL signal nursed one's health the signal output of top dead centre and CKP for standard；
Acquisition control unit, the marine diesel multi-cylinder cylinder pressure signal for processing signal condition unit carries out waiting crank angle
Synchronous acquisition and pretreatment；It is described pretreatment include burn out detection, crank-angle pulse distortion point judge, transient speed calculating and
The cylinder pressure signal period is average；
The grade crank angle synchronous collection method of the acquisition control unit is as follows：Mid low speed diesel fuel machine multi-cylinder in-cylinder pressure peculiar to vessel
Deng crank angle synchro measure, corner signal accesses a certain global clock pins of FPGA, by other multiple global clocks
, used as the data acquisition trigger of A/D converter, the synchronised clock of A/D converter data output is by controlling for pin synchronism output
Device FPGA produce, system with top dead centre and corner signal triggering collection, so as to realize the same of diesel engine multi-cylinder cylinder pressure
The collection of the crank angles such as step.
Host computer, for pressing data by pretreated cylinder, and is analyzed and processed, is calculated cylinder pressure characteristics parameter, right
Than showing each cylinder indicator card.
2. cylinder pressure on-line monitoring system according to claim 1, it is characterised in that the cylinder pressure sensor is electric current
Type sensor, exports 4-20mA range current signals.
3. cylinder pressure on-line monitoring system according to claim 1, it is characterised in that in the acquisition control unit,
The road cylinder pressure data acquisition channel of individual unit configuration 6.
4. cylinder pressure on-line monitoring system according to claim 1, it is characterised in that the cylinder pressure is online
Monitoring system also includes communication module, for realizing the data transfer between acquisition control unit and host computer.
5. cylinder pressure on-line monitoring system according to claim 1, it is characterised in that the cylinder pressure on-line monitoring
System includes multiple acquisition control units, and collection is started by same top dead centre signal between each acquisition control unit, and bent axle turns
Angle signal triggering collection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610871926.7A CN106644492A (en) | 2016-09-30 | 2016-09-30 | Marine middle-and-low-speed diesel engine cylinder pressure online monitoring system based on FPGA |
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| CN201610871926.7A CN106644492A (en) | 2016-09-30 | 2016-09-30 | Marine middle-and-low-speed diesel engine cylinder pressure online monitoring system based on FPGA |
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| CN201610871926.7A Pending CN106644492A (en) | 2016-09-30 | 2016-09-30 | Marine middle-and-low-speed diesel engine cylinder pressure online monitoring system based on FPGA |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107473125A (en) * | 2017-08-31 | 2017-12-15 | 中交二航局第二工程有限公司 | Monitoring assembly and system for FS final spice pushing tow girder |
| CN109213027A (en) * | 2018-07-16 | 2019-01-15 | 哈尔滨工程大学 | One kind being based on the marine low-speed common rail diesel engine speed adjustment unit of μ/COS-II real time operating system |
| CN109814460A (en) * | 2019-02-15 | 2019-05-28 | 广东工业大学 | A kind of chaotic signal generation method, device, equipment and readable storage medium storing program for executing |
| CN110486206A (en) * | 2019-08-12 | 2019-11-22 | 中车资阳机车有限公司 | A kind of measuring device and measurement method of electronic injection diesel engine fuel supply advance angle |
| CN113931742A (en) * | 2021-09-29 | 2022-01-14 | 上海海事大学 | Diesel engine connecting rod bearing temperature monitoring device and monitoring method |
| CN113933060A (en) * | 2021-09-08 | 2022-01-14 | 东风越野车有限公司 | Method and equipment for measuring zero reference angle of diesel engine |
| CN114459766A (en) * | 2022-01-13 | 2022-05-10 | 武汉理工大学 | Method for monitoring working state of oil head of crude oil generator set of ocean platform |
| CN114791330A (en) * | 2022-06-20 | 2022-07-26 | 中国空气动力研究与发展中心低速空气动力研究所 | Multichannel pressure scanning valve system |
| CN114962045A (en) * | 2022-05-26 | 2022-08-30 | 上海工程技术大学 | Multi-cylinder synchronous control method for marine low-speed engine |
| CN115727985A (en) * | 2022-11-18 | 2023-03-03 | 大连海事大学 | Portable indicator diagram measuring device |
| WO2023197505A1 (en) * | 2022-04-15 | 2023-10-19 | 中船动力研究院有限公司 | Driving control apparatus and method for marine low-speed machine, and electronic device |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107473125A (en) * | 2017-08-31 | 2017-12-15 | 中交二航局第二工程有限公司 | Monitoring assembly and system for FS final spice pushing tow girder |
| CN109213027A (en) * | 2018-07-16 | 2019-01-15 | 哈尔滨工程大学 | One kind being based on the marine low-speed common rail diesel engine speed adjustment unit of μ/COS-II real time operating system |
| CN109213027B (en) * | 2018-07-16 | 2021-07-16 | 哈尔滨工程大学 | Speed regulation unit of marine low-speed common rail diesel engine based on mu/COS-II real-time operation system |
| CN109814460A (en) * | 2019-02-15 | 2019-05-28 | 广东工业大学 | A kind of chaotic signal generation method, device, equipment and readable storage medium storing program for executing |
| CN110486206A (en) * | 2019-08-12 | 2019-11-22 | 中车资阳机车有限公司 | A kind of measuring device and measurement method of electronic injection diesel engine fuel supply advance angle |
| CN110486206B (en) * | 2019-08-12 | 2024-04-19 | 中车资阳机车有限公司 | Measuring device and measuring method for oil supply advance angle of electronic injection diesel engine |
| CN113933060B (en) * | 2021-09-08 | 2023-11-17 | 东风越野车有限公司 | Method and equipment for measuring zero reference angle of diesel engine |
| CN113933060A (en) * | 2021-09-08 | 2022-01-14 | 东风越野车有限公司 | Method and equipment for measuring zero reference angle of diesel engine |
| CN113931742B (en) * | 2021-09-29 | 2024-03-19 | 上海海事大学 | Diesel engine connecting rod bearing temperature monitoring device and monitoring method |
| CN113931742A (en) * | 2021-09-29 | 2022-01-14 | 上海海事大学 | Diesel engine connecting rod bearing temperature monitoring device and monitoring method |
| CN114459766A (en) * | 2022-01-13 | 2022-05-10 | 武汉理工大学 | Method for monitoring working state of oil head of crude oil generator set of ocean platform |
| CN114459766B (en) * | 2022-01-13 | 2024-06-11 | 武汉理工大学 | Method for monitoring working state of oil head of crude oil generator set on ocean platform |
| WO2023197505A1 (en) * | 2022-04-15 | 2023-10-19 | 中船动力研究院有限公司 | Driving control apparatus and method for marine low-speed machine, and electronic device |
| CN114962045A (en) * | 2022-05-26 | 2022-08-30 | 上海工程技术大学 | Multi-cylinder synchronous control method for marine low-speed engine |
| CN114791330A (en) * | 2022-06-20 | 2022-07-26 | 中国空气动力研究与发展中心低速空气动力研究所 | Multichannel pressure scanning valve system |
| CN115727985A (en) * | 2022-11-18 | 2023-03-03 | 大连海事大学 | Portable indicator diagram measuring device |
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Application publication date: 20170510 |