CN107727929A - The generating set frequency fluctuation rate detection means and method of reciprocating internal combustion engine driving - Google Patents
The generating set frequency fluctuation rate detection means and method of reciprocating internal combustion engine driving Download PDFInfo
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- CN107727929A CN107727929A CN201710968792.5A CN201710968792A CN107727929A CN 107727929 A CN107727929 A CN 107727929A CN 201710968792 A CN201710968792 A CN 201710968792A CN 107727929 A CN107727929 A CN 107727929A
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 18
- 238000001514 detection method Methods 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title abstract description 5
- 238000002955 isolation Methods 0.000 claims abstract description 26
- 238000007493 shaping process Methods 0.000 claims abstract description 22
- 238000004364 calculation method Methods 0.000 claims abstract description 11
- 238000012545 processing Methods 0.000 claims abstract description 4
- 238000004891 communication Methods 0.000 claims description 12
- 238000005259 measurement Methods 0.000 abstract description 7
- 238000005070 sampling Methods 0.000 abstract description 3
- 230000010355 oscillation Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000010354 integration Effects 0.000 description 3
- 241000208340 Araliaceae Species 0.000 description 2
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 2
- 235000003140 Panax quinquefolius Nutrition 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 235000008434 ginseng Nutrition 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 101000962345 Homo sapiens NACHT, LRR and PYD domains-containing protein 12 Proteins 0.000 description 1
- 102100039240 NACHT, LRR and PYD domains-containing protein 12 Human genes 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 210000000697 sensory organ Anatomy 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/16—Spectrum analysis; Fourier analysis
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
- G01R31/343—Testing dynamo-electric machines in operation
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Mathematical Physics (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention discloses the generating set frequency fluctuation rate detection means and method of a kind of reciprocating internal combustion engine driving, the detection means includes isolation module, Shaping Module, computing module and display module；Isolation module；The alternating current of generating set output is subjected to electrical isolation processing；Shaping Module：Sine wave alternating current pressure after isolation is subjected to shaping, is transformed to square-wave signal；Computing module：The cycle of each square wave is measured, then carries out derivative action, calculates the frequency in each cycle；The frequency values gathered in 1 second are compared, peak value and valley is identified, tries to achieve peak valley difference value；Mean value calculation, calculated rate average value are carried out to the frequency values in 1 second；By frequency peak valley difference value divided by average frequency value, percentage is converted into, obtains frequency fluctuation rate.The present invention directly carries out high-speed sampling and calculating using bottom circuit, ensure that the frequency measurement in each cycle is not lost, accurately to obtain peak, valley information, so that measurement result is accurate.
Description
Technical field
The invention belongs to the generating set manufacturing field of reciprocating internal combustion engine driving, and in particular to a kind of reciprocating internal combustion engine
The generating set frequency fluctuation rate detection means and method of driving.
Background technology
The generating set of reciprocating internal combustion engine driving is widely used in terms of emergency power supply, field energy offer.As
The reciprocating internal combustion engine of prime mover, when some defects be present, it may appear that speed oscillation, cause generation frequency unstable.Therefore,
Frequency fluctuation rate is the index that the generating set of reciprocating internal combustion engine driving must be paid close attention to and detect.
Existing test equipment passes through the real-time frequency data transfer that electricity ginseng instrument obtains to upper computing device, computing device
By software analysis, the peak valley difference value of calculated rate fluctuation and the percentage of average frequency value, as frequency fluctuation rate.Existing survey
Try equipment use electricity ginseng instrument, Refresh Data is slow, and uses both-way communication, hundreds of millisecond delays be present, it is about per second can only
Pass 4 data.And when speed oscillation occurs for internal combustion engine, about 0.8 second cycle of oscillation.As can be seen here, each speed oscillation cycle
It is interior, only 3 sampled values, many information are lost, cause the numerical value of peak, valley point to obtain inaccuracy, also imply that measurement misses
It is poor big.It is exactly all to have felt prime mover speed oscillation frequency wave that is obvious, and measuring with the sense organ of people most directly to embody
It is qualified that dynamic rate is but shown.
Therefore, prior art, which exists, measures the problem of inaccurate.
The content of the invention
It is an object of the invention to provide a kind of reciprocating internal combustion engine driving generating set frequency fluctuation rate detection means and
Method.
An object of the present invention realized by such technical scheme, a kind of generating of reciprocating internal combustion engine driving
Unit frequency fluctuation rate detection means, including isolation module, Shaping Module, computing module and display module；
Isolation module；The alternating current of generating set output is subjected to electrical isolation processing；
Shaping Module：Sine wave alternating current pressure after isolation is subjected to shaping, is transformed to square-wave signal；
Computing module：The cycle of each square wave is measured, then carries out derivative action, calculates each cycle
Frequency；The frequency values gathered in 1 second are compared, peak value and valley is identified, tries to achieve peak valley difference value；To the frequency in 1 second
Rate value carries out mean value calculation, calculated rate average value；By frequency peak valley difference value divided by average frequency value, percentage is converted into,
Obtain frequency fluctuation rate.
Further, in addition to display module, the display module show the frequency fluctuation rate score that computing obtains.
Further, in addition to frequency fluctuation rate is sent out by communication module, the communication module.
Further, the computing module includes optocoupler and single-chip microcomputer, the output of the optocoupler and input and Shaping Module
End connection, the output end of optocoupler are connected with single-chip microcomputer.
The second object of the present invention is achieved through the following technical solutions, a kind of generating of reciprocating internal combustion engine driving
Unit frequency fluctuation rate detection method, the alternating current that isolation module exports generating set carry out electrical isolation；Shaping Module will
Sine wave alternating current pressure after isolation carries out shaping, is transformed to square-wave signal；The cycle of each square wave is measured, then
Derivative action is carried out, calculates the frequency in each cycle；The frequency values gathered in 1 second are compared, identify peak value and
Valley, try to achieve peak valley difference value；Mean value calculation, calculated rate average value are carried out to the frequency values in 1 second；By frequency peak valley difference value
Divided by average frequency value, percentage is converted into, obtains frequency fluctuation rate.
Due to using above-mentioned technical proposal, the present invention has the advantage that：
The present invention directly carries out high-speed sampling and calculating using bottom circuit, ensure that the frequency measurement in each cycle is not lost
Lose, accurately to obtain peak, valley information, so that measurement result is accurate.And result of calculation still can be protected for communication to host computer
The needs of the system integration are stayed.The data volume of result of calculation be far from initial data amount it is big, it is unwise the problem of to communication delay
Sense.
Brief description of the drawings
In order that the object, technical solutions and advantages of the present invention are clearer, the present invention is made below in conjunction with accompanying drawing into
The detailed description of one step, wherein：
Fig. 1 is the theory diagram of the present invention；
Fig. 2 is the concrete structure diagram of the present invention.
Embodiment
In order that the object, technical solutions and advantages of the present invention are clearer, the present invention is made below in conjunction with accompanying drawing into
The detailed description of one step.
Fig. 1 is the theory diagram of the present invention, and Fig. 2 is the concrete structure diagram of the present invention.As shown in Figure 1, 2, it is a kind of reciprocating
Petrol-electric generating set class frequency stability bandwidth detection means, including isolation module, Shaping Module, computing module and display mould
Block；
Isolation module；The alternating current of generating set output is subjected to electrical isolation processing；
Shaping Module：Sine wave alternating current pressure after isolation is subjected to shaping, is transformed to square-wave signal；
Computing module：The cycle of each square wave is measured, then carries out derivative action, calculates each cycle
Frequency；The frequency values gathered in 1 second are compared, peak value and valley is identified, tries to achieve peak valley difference value；To the frequency in 1 second
Rate value carries out mean value calculation, calculated rate average value；By frequency peak valley difference value divided by average frequency value, percentage is converted into,
Obtain frequency fluctuation rate.
In the present invention, high voltage is converted into low-voltage by the isolation module by the way of downconverter.
In the present invention, Shaping Module uses RNO2, single-chip microcomputer STC89C52.
As the improvement to the present embodiment, detection means also includes display module, what the display module obtained computing
Frequency fluctuation rate score is shown.In the present invention, the frequency fluctuation rate score that computing obtains is shown using digital form of tubes
Show to come.Aobvious code pipe is LED5604.
As the improvement to the present embodiment, in addition to communication module, frequency fluctuation rate is sent out by the communication module.
Possess the function of externally sending testing result data, be easy to the system integration.Communication module is TTL/RS485.
In the present invention, the computing module includes optocoupler and single-chip microcomputer, the optocoupler and input and Shaping Module
Output end is connected, and the output end of optocoupler is connected with single-chip microcomputer.
Corresponding to the detection means, the present invention also provides a kind of generating set frequency fluctuation rate of reciprocating internal combustion engine driving
Detection method, the alternating current that isolation module exports generating set carry out electrical isolation；Shaping Module is by the sine wave after isolation
Alternating voltage carries out shaping, is transformed to square-wave signal；The cycle of each square wave is measured, then carries out derivative action,
Calculate the frequency in each cycle；The frequency values gathered in 1 second are compared, peak value and valley is identified, tries to achieve peak valley
Difference；Mean value calculation, calculated rate average value are carried out to the frequency values in 1 second；By frequency peak valley difference value divided by frequency averaging
Value, is converted into percentage, obtains frequency fluctuation rate.
The present invention directly carries out high-speed sampling and calculating using bottom circuit, ensure that the frequency measurement in each cycle is not lost
Lose, accurately to obtain peak, valley information, so that measurement result is accurate.And result of calculation still can be protected for communication to host computer
The needs of the system integration are stayed.The data volume of result of calculation be far from initial data amount it is big, it is unwise the problem of to communication delay
Sense.
Finally illustrate, the above embodiments are merely illustrative of the technical solutions of the present invention and it is unrestricted, although with reference to compared with
The present invention is described in detail good embodiment, it will be understood by those within the art that, can be to the skill of the present invention
Art scheme is modified or equivalent substitution, and without departing from the objective and scope of the technical program, it all should cover in the present invention
Right among.
Claims (5)
- A kind of 1. generating set frequency fluctuation rate detection means of reciprocating internal combustion engine driving, it is characterised in that：Including isolation mode Block, Shaping Module, computing module and display module；Isolation module；The alternating current of generating set output is subjected to electrical isolation processing；Shaping Module：Sine wave alternating current pressure after isolation is subjected to shaping, is transformed to square-wave signal；Computing module：The cycle of each square wave is measured, then carries out derivative action, calculates the frequency in each cycle Rate；The frequency values gathered in 1 second are compared, peak value and valley is identified, tries to achieve peak valley difference value；To the frequency in 1 second Value carries out mean value calculation, calculated rate average value；By frequency peak valley difference value divided by average frequency value, percentage is converted into, is obtained To frequency fluctuation rate.
- 2. a kind of generating set frequency fluctuation rate detection means of reciprocating internal combustion engine driving according to claim 1, its It is characterised by：Also include display module, the display module shows the frequency fluctuation rate score that computing obtains.
- 3. a kind of generating set frequency fluctuation rate detection means of reciprocating internal combustion engine driving according to claim 1, its It is characterised by：Also include communication module, frequency fluctuation rate is sent out by the communication module.
- 4. a kind of generating set frequency fluctuation rate detection means of reciprocating internal combustion engine driving according to claim 1, its It is characterised by：The computing module includes optocoupler and single-chip microcomputer, and the optocoupler is connected with the output end of input and Shaping Module, The output end of optocoupler is connected with single-chip microcomputer.
- A kind of 5. generating set frequency fluctuation rate detection method of reciprocating internal combustion engine driving, it is characterised in that：Isolation module will The alternating current of generating set output carries out electrical isolation；Sine wave alternating current pressure after isolation is carried out shaping by Shaping Module, is become It is changed to square-wave signal；The cycle of each square wave is measured, then carries out derivative action, calculates the frequency in each cycle Rate；The frequency values gathered in 1 second are compared, peak value and valley is identified, tries to achieve peak valley difference value；To the frequency in 1 second Value carries out mean value calculation, calculated rate average value；By frequency peak valley difference value divided by average frequency value, percentage is converted into, is obtained To frequency fluctuation rate.
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| CN201710968792.5A CN107727929A (en) | 2017-10-18 | 2017-10-18 | The generating set frequency fluctuation rate detection means and method of reciprocating internal combustion engine driving |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111351958A (en) * | 2018-12-21 | 2020-06-30 | 上海华虹计通智能***股份有限公司 | Time delay detection method and device, and fluid speed measurement method and system |
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