CN101886980A - Device for real-time combustion analysis of engine - Google Patents
Device for real-time combustion analysis of engine Download PDFInfo
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- CN101886980A CN101886980A CN2009101366387A CN200910136638A CN101886980A CN 101886980 A CN101886980 A CN 101886980A CN 2009101366387 A CN2009101366387 A CN 2009101366387A CN 200910136638 A CN200910136638 A CN 200910136638A CN 101886980 A CN101886980 A CN 101886980A
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Abstract
The invention relates to a test device for real-time combustion analysis of an engine, which is a novel PC instrument system for performance test and analysis of the engine. The test device mainly comprises a computer, a high-speed data acquisition card, a communication and conditioning circuit, a sensor, a stand engine and a corner marker. The test device can be used as a universal data acquisition device, and can be used for testing and analyzing performance parameters and combustion conditions of each working cycle by using a corner mark signal of the engine as a clock. The sensor for testing signals is arranged on an experiment table of the engine; and the signals output by the sensor are connected to a communication interface board through a conditioning module, then transmitted to the high-speed data acquisition card PCI-6133/23 and finally read, processed, displayed, stored, analyzed and the like by software programmed on the computer. When each working cycle is analyzed, the digital signals emitted by the corner marker are directly connected to the communication interface board to form a clock source and a trigger source of the acquisition card.
Description
Technical field
The present invention relates to a kind of testing apparatus that is used for real-time combustion analysis of engine, relate in particular to a kind of engine rig test is analyzed the fuel combustion heat release with cylinder pressure data equipment that is used for.
Background technology
The quality of combustion system of engine has very important effect to its performance level.Combustion system of engine not only has substantial connection with its economy and dynamic property, and air pollution and noise pollution are also had significant impact.For many years, in order to improve the combustion system of engine, each research institution has made unremitting effort.Therefore, research also improves the combustion process of engine, no matter is the development from engine itself, still from energy savings, reduce angle widely such as pollution, its far reaching significance all is tangible.
For the combustion process of research engine, must test combustion process, from microcosmic, the combustion process of engine is studied.Owing to the time compole that the combustion process of engine is used is short, residing space is very little, combustion reactant that the more important thing is engine is very uneven, and the reactant and the products of combustion that often are mobile and disturbance are in same volume, and everything is a physical and chemical process very complicated and changeable with regard to the combustion process that constitutes engine.Along with development of science and technology, measuring technology has also been brought up to a new developing stage, now by microsystem, high-performance data capture card, various advanced persons' sensor and corresponding modulate circuit, just the physical message in a large amount of combustion processes can be measured, writes down, handled and shows, can analyze the degree of perfection of engine combustion process from these information and figure reliablely, provide the foundation of science for further improving combustion process.
Given this, allergic effect of the present invention is adopted equipment with modern number, the utilization software and hardware combining, can accomplish frequency acquisition below 3MHz-signal of 8 passages of 10～10v, running parameter to engine is monitored in real time, and also has complete combustion analysis function, and it is practical.
Summary of the invention
The objective of the invention is to propose a kind of device that is used for real-time combustion analysis of engine and performance parameter test, it is a kind of novel PC instrument system that engine performance measuring is analyzed of carrying out, and moves under Windows operating system, and is powerful, simple to operate, easy to maintenance.Demonstration and hold function are perfect in real time, can gather 8 channel voltage amount signals simultaneously, the sampling rate of every passage can satisfy the requirement of engine peak speed, can be used as Universal Digital Collecting Equipment, can also do performance parameter and the combustion case that clock is tested its each working cycle with the footmark signal of engine.It mainly needs two big functional modules from overall setup:
1, based on the time data collection analysis
This function is that the internal clocking of using acquisition system comes image data, may also be referred to as the hyperchannel oscillograph, and can accomplish to preserve while gathering--promptly preserve data and not limited by internal memory, as long as the operator is ready to preserve the data and the Information Monitoring of arbitrary period, and can adjusts back demonstration and extract data and correlated sampling setting so that analyze.
2, based on footmark collection and real-time combustion analysis
This function is to utilize the standing angular signal of engine rig test to come the continuous acquisition data as clock source and triggering source, and handles, shows and preserve; Can judge the compression top center position, just can determine the crank angle of sampled point correspondence, and can show and preserve the data of complete cycle; Possesses certain analytic function, such as the combustion analysis of pressing signal based on cylinder, polytropic exponent analysis and functions such as engine speed calculating and demonstration in real time; Can callback data; In addition, also having an outstanding feature is the data in each cycle of can continuous uninterrupted sampling.
Description of drawings
Fig. 1 forms structural representation for hardware
Fig. 2 is based on time collecting flowchart figure
Fig. 3 is based on footmark data acquisition flow figure
Beneficial effect
Allergic effect of the present invention is adopted equipment with modern number, use software and hardware combining, can accomplish frequency acquisition below 3MHz-signal of 8 passages of 10～10v, the running parameter of engine is carried out Real Time Monitoring, and also have complete combustion analysis function, have great practical value.
Embodiment
The method of specific implementation of the present invention is as follows:
1, hardware configuration
Hardware of the present invention is formed as shown in Figure 1, mainly contains computing machine, high-speed data acquisition card, communication and modulate circuit, sensor, stand engine, footmark instrument.The sensor of the test signal of wanting is installed on engine experimental table, the signal of its output is connected to the communication interface plate through conditioning module, pass on the high-speed data acquisition card PCI-6133/23, the software of working out on the last machine as calculated reads, handles, shows, preservation, analysis etc. again.As the work analysis in cycle of need, the digital signal that requires the footmark instrument is sent is directly connected to the communication interface plate, is used as the clock source and the triggering source of capture card.
2, software is realized
Software of the present invention is realized mainly finishing by the driver of LabVIEW development platform and data collecting card, and the specific implementation method is as follows:
1) realizes based on the software of time data collection analysis
Owing to the requirement of the real-time of gathering based on time data, data are preserved synchronous with collection, and preferably accomplish whether to preserve the carrying out that does not influence collection, so just can accomplish not miss any pilot signal.Be provided with shown in the process flow diagram of time collection as Fig. 2, after startup is gathered this sub-module based on the time, become the collection that the yes system just begins data beginning to gather switching value, up to becoming yes and just stop data acquisition stopping to gather switching value, and the collection of data and data are preserved and are placed on respectively in two parallel threads, the judgement that the buffer data renewal is set in the thread that data are preserved realizes preserving the unicity of data, so just, accomplish to gather and preserve and do not disturb and can be synchronous, preserve file type and select the TDMS type for use, make that the speed of data storage is enough fast.
2) realize based on the software of footmark collection and real-time combustion analysis
When combustion analysis, require cylinder pressure data corresponding with crank angle.There is not the crank angle value if only show cylinder to press numerical value, just can't draw load-position diagram, let alone combustion analysis.At present, widespread use optical-electricity encoder (promptly sending several corner pulses of frequency division and a basic pulse in weekly) is measured tach signal, at this situation, native system directly utilizes the clock source of corner signal as data acquisition, reference signal is as the triggering source, just understand reading of data when just after capture program starts, sensing reference signal, and an in-cylinder pressure is just gathered in corner pulse of every appearance, so just realized the cylinder pressure easily, oil pressure, cycle signal such as needle lift is corresponding with corner, therefore claims this function to be the data collection and analysis function based on footmark.It mainly contains that data acquisition, top dead centre are determined, figure is selected to show in real time, data preservation and importing, data processing, real-time combustion analysis modules such as (rate of heat release calculating) composition.
The implementation method of each submodule is as follows:
Data acquisition: as shown in Figure 4 based on the process flow diagram of footmark data acquisition, relatively its main line is similar with time-based data acquisition flow, main be not both it will be with footmark instrument footmark signal as the clock source, reference signal is come image data as the triggering source.The PCI-6123/6133 capture card needs two links for the realization of external trigger and external clock: first is exactly method of attachment, and PCI-6123/6133 has the external trigger input and the external clock input pin of definition; Second is exactly software setting.It should be noted that the external clock requirement is the TTL signal of standard very.
Data are preserved: the data of this function are preserved and are different from time-based data preservation, its implementation is the data of placing a plurality of work periods of gathering at buffer zone, when preserving, directly the data of buffer zone are saved to text through corresponding calculated, and the data that when stopping to gather, also can also preserve buffer zone.
Data presentation:, require the words of continuous acquisition just need divide different threads to handle showing with gathering because the X-Y scheme speed of displaying is slower than the speed of data acquisition.Native system has divided 3 threads exactly, and one is as the data continuous acquisition, its two be new gather complete cycle a deposit data in the buffer zone of specifying size, it is three for showing after or the computational analysis treated from the buffer zone reading of data.Why data acquisition with to write buffer zone separately mainly be to cause when solving the big buffer zone of definition and gathering fast sampling discontinuous or mistake occurs in order to avoid program is crossed slow.
Data processing: in general, in the data that data acquisition system (DAS) collects, often be superimposed with noise, noise has two big classes: a class is for periodic, and another kind of is irregular.The former typical case is represented as the power frequency of 50Hz and disturbs, and the latter is represented as random signal.Because the existence of random disturbance makes the curve that plots with the sample variance data present broken line shape, very not fairing more.In order to weaken the influence of interference, improve the smoothness of curve, usually need sampled data is carried out fairing processing.Native system is selected 5 triple smoothings and medium filtering for use
Determining of top dead centre: this function mainly adopts the pure compression collimation method to determine dynamic top dead centre, its basic skills is measured multiply periodic cylinder exactly and is pressed data, find average cylinder to press the side-play amount of maximum point relative datum signal, but also the side-play amount of top dead centre relative datum signal being arranged to input signal, mainly is consideration direct input value when dynamic top dead centre measurement mechanism is arranged.
Combustion analysis (rate of heat release calculating): because the requirement of system's rapidity and property simple to operate, the rate of heat release of this function is calculated and is adopted permanent polytropic index model, promptly
It can be equivalent to the rate of heat release model of ignoring heat transfer, and to get permanent polytropic exponent be adiabatic exponent
Claims (5)
1. equipment that is used for real-time combustion analysis of engine, it is characterized in that: described equipment comprises: stand engine and mounted thereto corresponding sensor device thereof of being used to provide measured signal; Be used for communication and modulate circuit device to nursing one's health from sensor signal and transmitting; Be used for carry out the device of data acquisition from the signal of communication and modulate circuit; Be used for the information of data collector read in, analyze, show, the software and the computing machine of function such as preservation; And the footmark instrument that is used to produce external clock and external trigger.
2. a kind of equipment that is used for real-time combustion analysis of engine according to claim 1, it is characterized in that, the sensor of the test signal of wanting is installed on engine experimental table, the signal of its output is connected to the communication interface plate through conditioning module, pass on the high-speed data acquisition card PCI-6133/23, the software of working out on the last machine as calculated reads, handles, shows, preservation, analysis etc. again.As the work analysis in cycle of need, the digital signal that requires the footmark instrument is sent is directly connected to the communication interface plate, is used as the clock source and the triggering source of capture card.
3. a kind of equipment that is used for real-time combustion analysis of engine according to claim 1, it is characterized in that, described data acquisition can divide two different functions, one is based on the concrete employing frequency of time set gathers, and another kind is based on data of the corresponding pulse collection of angular signal of footmark.
4. a kind of equipment that is used for real-time combustion analysis of engine according to claim 1 is characterized in that, it has hardware and software two parts to constitute, and software can be tested demonstration, analysis, preservation and the readjustment to image data.
5. a kind of equipment that is used for real-time combustion analysis of engine according to claim 1 is characterized in that, can be to engine through row combustion analysis, polytropic exponent analysis, acting analysis and statistic analysis etc.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101366387A CN101886980A (en) | 2009-05-11 | 2009-05-11 | Device for real-time combustion analysis of engine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009101366387A CN101886980A (en) | 2009-05-11 | 2009-05-11 | Device for real-time combustion analysis of engine |
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| CN101886980A true CN101886980A (en) | 2010-11-17 |
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| CN2009101366387A Pending CN101886980A (en) | 2009-05-11 | 2009-05-11 | Device for real-time combustion analysis of engine |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103033367A (en) * | 2012-12-31 | 2013-04-10 | 潍柴动力股份有限公司 | Method and device for analyzing combustion process of fuel in engine cylinder |
| CN109869230A (en) * | 2018-12-26 | 2019-06-11 | 华北水利水电大学 | Multifunctional engine in-cylinder pressure trigger collection signal frequency split system |
| CN109946084A (en) * | 2019-03-21 | 2019-06-28 | 北京邦曼科技有限公司 | A kind of hand-held combustion analysis equipment and its application method |
-
2009
- 2009-05-11 CN CN2009101366387A patent/CN101886980A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103033367A (en) * | 2012-12-31 | 2013-04-10 | 潍柴动力股份有限公司 | Method and device for analyzing combustion process of fuel in engine cylinder |
| CN103033367B (en) * | 2012-12-31 | 2015-05-13 | 潍柴动力股份有限公司 | Method and device for analyzing combustion process of fuel in engine cylinder |
| CN109869230A (en) * | 2018-12-26 | 2019-06-11 | 华北水利水电大学 | Multifunctional engine in-cylinder pressure trigger collection signal frequency split system |
| CN109946084A (en) * | 2019-03-21 | 2019-06-28 | 北京邦曼科技有限公司 | A kind of hand-held combustion analysis equipment and its application method |
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Application publication date: 20101117 |