CN103308707A - Self-adaptation rotating speed measurement method - Google Patents
Self-adaptation rotating speed measurement method Download PDFInfo
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- CN103308707A CN103308707A CN2013101900671A CN201310190067A CN103308707A CN 103308707 A CN103308707 A CN 103308707A CN 2013101900671 A CN2013101900671 A CN 2013101900671A CN 201310190067 A CN201310190067 A CN 201310190067A CN 103308707 A CN103308707 A CN 103308707A
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Abstract
The invention discloses a self-adaptation rotating speed measurement method, which comprises five steps of acquiring rotating speed, calculating the number of sampled points, judging whether the number of the sampled points is greater than a threshold or not, digitally filtering the rotating speed and prompting matching out-of-place. The method has the beneficial effects of capability of calculating the number of speed sampled points in a self-adaptation way according to the rotating speed, being good in real-time performance in low-frequency and stable in measured rotating speed in high frequency, being high in environment adaptability and reliability, capability of avoiding the influence of speed measurement error caused by high-frequency speed jump-points and count pulse loss, being simple and easy to use and having high measurement precision and high calculating efficiency.
Description
Technical field
The present invention relates to the tachometric survey field, relate in particular to a kind of self-adaptation rotating speed measurement method.
Background technology
Tachometric survey almost is applied to all industrial occasions, no matter is diesel engine, gasoline engine, or motor, turbojet engine, and the rotating speed index all is the important indicator of its performance.Therefore, how quick and precisely measuring rotating speed, is a very important problem.
At present, tachometric survey mainly contains three kinds of methods: 1. " M method "." M method " comes Calculation Speed by the tacho pulse number of measuring in a period of time interval, it is generally acknowledged that its low-speed performance is relatively poor; 2. " T method "." T method " it is generally acknowledged that by the time interval Calculation Speed between two adjacent pulses measuring tach signal its high speed performance is bad; 3. " M/T method ". " M/T method " is the combination of above two kinds of methods, measure simultaneously a certain number of tacho-pulse and generation used time of these pulses, preferably accuracy is arranged in whole velocity range, however its bad dynamic performance when low speed, and real-time is bad.
Summary of the invention
The technical matters that (one) will solve
The present invention is intended to solve existing rotating speed measurement method and has the problem that can't take into account high and low rotating speed and dynamic property.
(2) technical scheme
The present invention proposes a kind of self-adaptation rotating speed measurement method, measure rotating speed according to a tacho-pulse, this tacho-pulse is from speed measuring system, the one-period of tacho-pulse represents that measured wheelwork rotates a fixed angle, this rotating speed measurement method comprises the steps: S1, measures the current period of tacho-pulse, according to the current rotating speed of the computation of Period of this tacho-pulse; S2, calculate the sampling number of the tacho-pulse in the preset time window according to described current rotating speed, described sampling number refers to the number of times that described tacho-pulse is sampled in the preset time window; S3, whether judge described sampling number more than or equal to a threshold value, if, execution in step S4 then; S4, in a described preset time window, described tacho-pulse repeatedly sampled and calculate the rotating speed of each sampled point, the described repeatedly number of times of sampling is the sampling number that described step S2 calculates, rotating speed according to these a plurality of sampled points carries out the rotating speed digital filtering again, tries to achieve the rotating speed mean value in this preset time window.
According to a kind of embodiment of the present invention, described step S3 also comprises: when judging that described sampling number is less than described threshold value, execution in step S5 then: cue is not mated in output.
A kind of embodiment according to the present invention is in step S1, as the current period T of tacho-pulse
1Unit be that s, code-disc line number are A line/turn (namely rotate a circle and produce A pulse), the unit of current rotation speed n be rpm (rpm) time, calculate current rotating speed according to following formula:
A kind of embodiment according to the present invention in step S2, when described tacho-pulse during from the closed loop revolution speed control system, according to
Calculate described sampling number, wherein, T is the closed-loop control cycle of this closed loop revolution speed control system.
According to a kind of embodiment of the present invention, in step S3, the value of threshold value is not less than 5.
A kind of embodiment according to the present invention is in step S4, and described rotating speed digital filtering comprises: for the N that a records rotating speed, by arranging from small to large, remove minimum value n
MinWith maximal value n
Max, N-2 remaining tachometer value averaged.
(3) beneficial effect
The present invention is by improving " T method ", self-adaptation is regulated in the whole range of speeds (low speed, middling speed, at a high speed), and take into full account the impact of closed-loop regulating system control cycle, have following beneficial effect: the one, can calculate counting of speed sampling according to the speed adaptometer of rotating speed, real-time is better when low frequency, the rotating speed of measuring when high frequency is steady, and adaptive capacity to environment is strong, reliability is high; The 2nd, the data noise that can avoid high frequency speed hop and counting loss to cause, measuring accuracy is high; The 3rd, method is simple and easy to usefulness, and counting yield is high.
Description of drawings
Fig. 1 is the workflow diagram according to a kind of self-adaptation rotating speed measurement method of the present invention.
Embodiment
For the problem that existing method exists, the present invention proposes a kind of self-adaptation rotating speed measurement method and equipment thereof, for example is applied in the revolution speed control system.The present invention is by improving " T method ", and take into full account the impact of closed loop speed adjustment system control cycle T, (low speed, middling speed, at a high speed) self-adaptation is regulated in the whole range of speeds, can process preferably the problem of often meeting in the tachometric surveies such as counting loss, high frequency interference, real-time is good.
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in further detail.
Fig. 1 is the workflow diagram according to a kind of self-adaptation rotating speed measurement method of the present invention.As shown in Figure 1, method of the present invention is measured rotating speed adaptively according to a tacho-pulse, and the one-period of tacho-pulse represents that measured wheelwork rotates a fixed angle.Specifically, method of the present invention comprises following five steps:
Step S1: measure the current period of tacho-pulse, according to the current rotating speed of the computation of Period of this tacho-pulse.
Specifically, this step gathers rotating speed by the T method, namely calculates current rotating speed by the cycle of measuring tacho-pulse.Current period T when tacho-pulse
1Unit be that s (second), code-disc line number are A line/turn (namely rotate a circle and produce A pulse), the unit of current rotation speed n be rpm (rpm) time, following formula is arranged:
Step S2: calculate the sampling number of the tacho-pulse in the preset time window according to described current rotating speed, described sampling number refers to the number of times that described tacho-pulse is sampled in the preset time window.
Generally speaking, the rotating speed control cycle of closed loop revolution speed control system is at Millisecond, and velocity variations is smaller within the so short time, so in this rotating speed control cycle, the cycle T of tacho-pulse
1Roughly constant, consider the situation that high frequency speed hop and count pulse are lost, only in this rotating speed control cycle, gather the point of half.Be that sampling number can calculate with following formula
Wherein, T is the closed-loop control cycle of this closed loop revolution speed control system.
Step S3: whether judge described sampling number more than or equal to a threshold value, if, execution in step S4 then, otherwise execution in step S5.
If this threshold value is a constant M (M is positive integer), according to Shannon's sampling theorem, the discrete system sampling rate will double controlled frequency at least, in order to guarantee system performance, for revolution speed control system, is preferably and gets M and be not less than 5.If step S2 calculate sampling number less than M, think that then control cycle and speed measuring device do not mate, and then advance to step S5.
Step S4: in a preset time window, described tacho-pulse repeatedly sampled and calculate the rotating speed of each sampled point, the described repeatedly number of times of sampling is the sampling number that described step S2 calculates, rotating speed according to these a plurality of sampled points carries out the rotating speed digital filtering again, tries to achieve the rotating speed mean value in this preset time window.
The present invention is not limited to the closed loop revolution speed control system, if described tacho-pulse, also can be selected a suitable preset time window from open cycle system, but counting of sampling also should be greater than threshold value M in this preset time window.
According to a kind of embodiment, the rotating speed digital filtering is: evenly gather N rotating speed in current control cycle, and it is existed in the N dimension group, by arranging from small to large, remove minimum value n again
MinWith maximal value n
Max, rotating speed mean value n is tried to achieve in N-2 remaining tachometer value summation again
Av
Step S5: when step S3 judges described sampling number less than described threshold value, represent that then current time window and tacho-pulse do not mate, then cue is not mated in output.
This step reminding user control cycle and speed measuring device do not mate, or control cycle is changed length, or the precision of speed measuring device is improved (the code-disc line number that tests the speed increase).
The below lifts a preferred embodiment and further specifies system and method for the present invention.In this preferential example, T=50ms, M=5, the scope of rotating speed is from 500-100000rpm, and adopting the STM32F103 single-chip microcomputer is CPU, and rotation-speed measuring device is Hall element, it is 1 that line is counted A, namely whenever rotates a circle to produce a pulse, and the method is applied in the turbojet engine tachometric survey.
Above-described embodiment shows, the present invention compared with prior art has following several respects beneficial effect: the one, can calculate counting of speed sampling according to the speed adaptometer of rotating speed, and real-time is better when low frequency, the rotating speed of measuring when high frequency is steady, and adaptive capacity to environment is strong, reliability is high; The 2nd, the data noise that can avoid high frequency speed hop and counting loss to cause, measuring accuracy is high; The 3rd, method is simple and easy to usefulness, and counting yield is high.
Above-described specific embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; be understood that; the above only is specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. self-adaptation rotating speed measurement method, measure rotating speed according to a tacho-pulse, this tacho-pulse is from speed measuring system, and the one-period of tacho-pulse represents that measured wheelwork rotates a fixed angle, it is characterized in that, this rotating speed measurement method comprises the steps:
The current period of S1, measurement tacho-pulse is according to the current rotating speed of the computation of Period of this tacho-pulse;
S2, calculate the sampling number of a tacho-pulse in the preset time window according to described current rotating speed, described sampling number refers to the number of times that described tacho-pulse is sampled in the preset time window;
S3, whether judge described sampling number more than or equal to a threshold value, if, execution in step S4 then;
S4, in described preset time window, described tacho-pulse repeatedly sampled and calculate the rotating speed of each sampled point, the described repeatedly number of times of sampling is the sampling number that described step S2 calculates, rotating speed according to these a plurality of sampled points carries out the rotating speed digital filtering again, tries to achieve the rotating speed mean value in this preset time window.
2. self-adaptation rotating speed measurement method as claimed in claim 1 is characterized in that, described step S3 also comprises: when judging that described sampling number is less than described threshold value, and execution in step S5 then:
Cue is not mated in S5, output.
3. self-adaptation rotating speed measurement method as claimed in claim 1 or 2 is characterized in that,
In step S1, as the current period T of tacho-pulse
1Unit be that the unit of s, current rotation speed n is rpm, code-disc line number is A line/when turning, A line/turning expression rotates a circle and produces A pulse, calculates current rotating speed according to following formula:
4. self-adaptation rotating speed measurement method as claimed in claim 1 or 2 is characterized in that,
In step S2, when described tacho-pulse during from the closed loop revolution speed control system, according to
Calculate described sampling number, wherein, T is the closed-loop control cycle of this closed loop revolution speed control system.
5. self-adaptation rotating speed measurement method as claimed in claim 1 or 2 is characterized in that,
In step S3, the value of threshold value is not less than 5.
6. self-adaptation rotating speed measurement method as claimed in claim 1 or 2 is characterized in that, in step S4, described rotating speed digital filtering comprises: for the N that a records rotating speed, by arranging from small to large, remove minimum value n
MinWith maximal value n
Max, N-2 remaining tachometer value averaged.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103913591A (en) * | 2014-03-03 | 2014-07-09 | 深圳市智慧机器技术有限公司 | Method and device for measuring rotating speeds of rotating device |
| CN104198754A (en) * | 2014-09-11 | 2014-12-10 | 中国人民解放军海军航空工程学院青岛校区 | Aero-engine rotation speed testing system |
| CN104407166A (en) * | 2014-11-27 | 2015-03-11 | 中国船舶重工集团公司第七二四研究所 | Motor rotation speed precision measuring method capable of adjusting count pulses in self-adaptation manner |
| CN104730277A (en) * | 2015-04-01 | 2015-06-24 | 武汉理工通宇新源动力有限公司 | Gearbox rotating speed measuring method |
| CN105319384A (en) * | 2015-08-28 | 2016-02-10 | 贵州航天林泉电机有限公司 | Self-adaptive M/T speed measuring system based on FPGA |
| CN106126840A (en) * | 2016-06-29 | 2016-11-16 | 电子科技大学 | Rotating machinery rotating speed based on orbit of shaft center calculates device and method |
| CN108169557A (en) * | 2017-11-24 | 2018-06-15 | 中核控制系统工程有限公司 | A kind of implementation method of high-speed pulse amount intelligent acquisition |
| CN111679091A (en) * | 2020-04-30 | 2020-09-18 | 中国航发南方工业有限公司 | High-real-time segmented self-adaptive rotating speed measuring method, device, medium and equipment |
| CN112033451A (en) * | 2020-08-03 | 2020-12-04 | 珠海格力电器股份有限公司 | Measuring device and method of encoder and encoder |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103913591A (en) * | 2014-03-03 | 2014-07-09 | 深圳市智慧机器技术有限公司 | Method and device for measuring rotating speeds of rotating device |
| CN104198754A (en) * | 2014-09-11 | 2014-12-10 | 中国人民解放军海军航空工程学院青岛校区 | Aero-engine rotation speed testing system |
| CN104198754B (en) * | 2014-09-11 | 2015-10-21 | 中国人民解放军海军航空工程学院青岛校区 | Aeromotor rotary speed test system |
| CN104407166A (en) * | 2014-11-27 | 2015-03-11 | 中国船舶重工集团公司第七二四研究所 | Motor rotation speed precision measuring method capable of adjusting count pulses in self-adaptation manner |
| CN104730277A (en) * | 2015-04-01 | 2015-06-24 | 武汉理工通宇新源动力有限公司 | Gearbox rotating speed measuring method |
| CN104730277B (en) * | 2015-04-01 | 2017-10-03 | 武汉理工通宇新源动力有限公司 | A kind of gearbox rotating speed measurement method |
| CN105319384B (en) * | 2015-08-28 | 2018-05-01 | 贵州航天林泉电机有限公司 | A kind of adaptive M based on FPGA/T velocity-measuring systems |
| CN105319384A (en) * | 2015-08-28 | 2016-02-10 | 贵州航天林泉电机有限公司 | Self-adaptive M/T speed measuring system based on FPGA |
| CN106126840A (en) * | 2016-06-29 | 2016-11-16 | 电子科技大学 | Rotating machinery rotating speed based on orbit of shaft center calculates device and method |
| CN106126840B (en) * | 2016-06-29 | 2019-05-21 | 电子科技大学 | Rotating machinery revolving speed based on orbit of shaft center calculates device and method |
| CN108169557A (en) * | 2017-11-24 | 2018-06-15 | 中核控制系统工程有限公司 | A kind of implementation method of high-speed pulse amount intelligent acquisition |
| CN111679091A (en) * | 2020-04-30 | 2020-09-18 | 中国航发南方工业有限公司 | High-real-time segmented self-adaptive rotating speed measuring method, device, medium and equipment |
| CN112033451A (en) * | 2020-08-03 | 2020-12-04 | 珠海格力电器股份有限公司 | Measuring device and method of encoder and encoder |
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Application publication date: 20130918 |