CN112526155A - Configurable rotating speed signal acquisition method - Google Patents
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- CN112526155A CN112526155A CN202011278586.XA CN202011278586A CN112526155A CN 112526155 A CN112526155 A CN 112526155A CN 202011278586 A CN202011278586 A CN 202011278586A CN 112526155 A CN112526155 A CN 112526155A
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- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/42—Devices characterised by the use of electric or magnetic means
- G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
- G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
- G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
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Abstract
The invention provides a configurable rotating speed signal acquisition method, which solves the problems of poor robustness, single application and the like of the traditional schemes of a cycle measuring method and a frequency measuring method based on a processor or a programmable device. The method comprises the following steps: acquiring an externally input rotating speed signal; synchronously processing the rotating speed signals; carrying out continuous rotating speed signal filtering processing according to a preset filtering periodicity n relative to the sampling clock; carrying out sampling counting on the rotating speed signals according to a preset rotating speed signal periodicity m; and outputting a rotating speed signal sampling result. The invention realizes the filtering of the rotating speed signal and the adjustment of the rotating speed signal acquisition period by configuring the filtering sampling clock period number and the rotating speed signal period number, eliminates unstable factors and errors caused by gear machining and vibration environment, and has certain robustness and flexibility for acquiring the rotating speed signal in a complex electromagnetic environment.
Description
Technical Field
The invention belongs to a signal processing technology, and particularly relates to a method for acquiring a rotating speed signal.
Background
In the fields of aviation and industrial control, closed-loop control of a system generally needs to acquire rotating speed information of power components such as an engine or a motor, and the requirements on the real-time performance and the reliability of the rotating speed signal acquisition are higher and higher. The mechanical shafts of the engine, the motor and the like are provided with gears with different tooth numbers, and in practical application, the frequency (or period) of the teeth on the gears is collected and converted into the frequency (or period) of the shafts according to the tooth numbers. The shape of each tooth is not completely the same in the manufacturing process, and the corresponding rotating speed signals of each tooth are not completely consistent.
The current method for acquiring the rotating speed signal is a cycle measuring method and a frequency measuring method based on a processor or a programmable device. The two methods can achieve high rotating speed signal acquisition precision under corresponding conditions, but lack special analysis on rotating speed characteristics under the application environment of an aircraft engine and an industrial motor, and do not consider unstable factors and errors caused by gear machining and vibration environment. The electromagnetic environment of an aircraft engine and an industrial motor is complex, the rotating speed signal is easily interfered by the external environment, and the variation range of the rotating speed signal is very large and ranges from tens of thousands of revolutions per minute to several revolutions per minute.
Disclosure of Invention
The purpose of the invention is: aiming at the complex electromagnetic environment and rotation speed signal characteristics in the fields of aviation and industrial control, the problems of poor error and robustness, single application and the like existing in the traditional schemes of the traditional frequency measurement method and the traditional frequency measurement method are solved.
In order to achieve the above object, the present invention proposes the following solutions:
a method of configurable tachometer signal acquisition, comprising:
step 1) acquiring an externally input rotating speed signal;
step 2) synchronous processing of rotating speed signals;
step 3) carrying out continuous rotating speed signal filtering processing according to a preset filtering periodicity n, wherein the filtering periodicity n is the sampling clock periodicity required by filtering, and n is more than or equal to 1;
step 4) sampling and counting the rotating speed signals according to a preset rotating speed signal period number m, wherein the rotating speed signal period number m represents the time for carrying out one-time effective sampling, and m is more than or equal to 2;
and 5) outputting a rotating speed signal sampling result.
Further, the step 3) may specifically be:
sampling the synchronized rotating speed signal by a sampling clock;
if the sampled rotating speed signal state is less than n sampling clock cycles continuously, the rotating speed signal state after last synchronization is maintained and output as an interference signal;
and if the sampled rotating speed signal state continuously reaches more than n sampling clock cycles, outputting the synchronized rotating speed signal state.
Further, the step 4) may specifically be:
carrying out edge detection on the filtered rotating speed signals, and carrying out cycle counting accumulation 1 on the rotating speed signals when the same type of edges are detected;
when the period count of the rotating speed signal is continuously accumulated to m, one effective sampling is finished; then when the same type of edge is detected next time, setting the period count of the rotating speed signal as 1 and starting the next sampling period;
and in a sampling period, carrying out sampling counting accumulation 1 on the rotation speed signal by using a sampling clock, latching a sampling counting value p of the current rotation speed signal when the next sampling period starts, and setting the sampling counting of the rotation speed signal to be 1.
Optionally, step 2) may specifically be: the externally input rotating speed signal is continuously latched for three sampling clock periods by using a sampling clock so as to be synchronized to a sampling clock domain.
Optionally, step 5) may specifically be: and latching and outputting the sampling count value p of the current rotating speed signal latched in the step 4), the configured filtering period number n and the configured rotating speed signal period number m.
Alternatively, the method may be implemented based on programmable logic or an ASIC.
The invention also provides a configurable rotating speed signal acquisition system correspondingly, which comprises:
the signal input module is used for acquiring an externally input rotating speed signal;
the synchronous processing module is used for synchronously processing the rotating speed signals;
the filtering processing module is used for carrying out continuous rotating speed signal filtering processing according to a preset filtering periodicity n, wherein the filtering periodicity n is the sampling clock periodicity required by filtering, and n is more than or equal to 1;
the signal sampling module is used for sampling and counting the rotating speed signals according to a preset rotating speed signal period number m, wherein the rotating speed signal period number m represents the time for carrying out one-time effective sampling, and m is more than or equal to 2;
and the signal output module is used for outputting the sampling result of the rotating speed signal.
The modules can be realized by hardware and/or software according to actual situations.
Further:
the continuous rotating speed signal filtering processing is carried out according to the preset filtering periodicity n, and specifically comprises the following steps:
sampling the synchronized rotating speed signal by a sampling clock;
if the sampled rotating speed signal state is less than n sampling clock cycles continuously, the rotating speed signal state after last synchronization is maintained and output as an interference signal;
if the sampled rotating speed signal state continuously reaches more than n sampling clock cycles, outputting the synchronized rotating speed signal state;
the rotating speed signal sampling counting is carried out according to the preset rotating speed signal periodicity m, and specifically comprises the following steps:
carrying out edge detection on the filtered rotating speed signals, and carrying out cycle counting accumulation 1 on the rotating speed signals when the same type of edges are detected;
when the period count of the rotating speed signal is continuously accumulated to m, one effective sampling is finished; then when the same type of edge is detected next time, setting the period count of the rotating speed signal as 1 and starting the next sampling period;
and in a sampling period, carrying out sampling counting accumulation 1 on the rotation speed signal by using a sampling clock, latching a sampling counting value p of the current rotation speed signal when the next sampling period starts, and setting the sampling counting of the rotation speed signal to be 1.
The invention also provides computer equipment which comprises a processor and a memory, wherein the memory stores a plurality of programs, and the computer equipment is characterized in that the programs realize the configurable rotating speed signal acquisition method when being loaded and run by the processor.
The invention also provides a computer readable storage medium storing several programs, which is characterized in that the programs realize the above-mentioned configurable rotational speed signal acquisition method when being loaded and run by a processor.
The invention has the technical effects that:
the invention realizes the filtering of the rotating speed signal and the adjustment of the rotating speed signal acquisition period by configuring the filtering sampling clock period number and the rotating speed signal period number, weakens unstable factors and errors caused by gear machining and vibration environment, and has certain robustness and flexibility for acquiring the rotating speed signal in a complex electromagnetic environment.
Drawings
Fig. 1 is a schematic diagram of a configurable speed signal acquisition method according to an embodiment of the present application.
Fig. 2 is a schematic diagram of a sampling clock, a pre-filter rotation speed signal, a post-filter rotation speed signal, and a sampling period in an embodiment of the present application.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings.
Sampling clock period: a fixed period of the sampling clock.
Configured number of filtering cycles: the number of sampling clock cycles required by filtering set according to the characteristics of the sampling object is equivalent to setting a filtering time parameter by taking the sampling clock cycles as a timing unit. If n is too large, the filtering cycle number is n, which results in filtering out the effective signal, and if n is too small, which results in introducing an interference signal.
The period of the rotating speed signal: the period of the input revolution speed signal. The period is not fixed, but may vary in the duration of the signal period for each tooth due to gear rotation speed, machining, vibration, and the like.
Configured number of revolution speed signal cycles: the number of consecutive multiple revolution speed signal cycles (corresponding to consecutive multiple teeth) set according to an error requirement or the like. In order to eliminate/reduce errors, the sum of a plurality of continuous rotation speed signal periods is set as a sampling period. If the number of cycles of the configured rotating speed signal is m, m is not less than 2 and not more than the number of teeth of the measured object (gear) (m is more than the number of teeth, no practical significance exists).
Sampling period (rotational speed signal acquisition period): the time (duration) for effectively sampling the input rotation speed signal once is the rotation speed signal period number configured in the invention, namely the counting period of the rotation speed signal period counter.
Sampling and counting value of rotating speed signal: and (4) sampling and counting the rotating speed signal by using a sampling clock (the number of sampling clock cycles corresponding to one rotating speed signal acquisition cycle).
As shown in fig. 1, the embodiment provides a method for flexibly and configurable acquisition of a rotation speed signal, which has high filtering robustness, for complex electromagnetic environments and rotation speed signal characteristics in the fields of aviation and industrial control.
The method comprises the following steps of carrying out filter period configuration and rotation speed signal period configuration in advance:
A. filter period configuration
The number of filtering cycles relative to the sampling clock, i.e. the number of sampling clock cycles required for filtering, is configured. The sampling clock is selected according to the frequency range of the rotating speed signal to achieve certain acquisition precision and is used as a global clock of the rotating speed signal acquisition method. Let the sampling clock frequency be FSAnd (5) setting the configured filtering period number as n (n is more than or equal to 1) in Hertz.
B. Rotation speed signal period configuration
And configuring the number of the rotation speed signal cycles required to be completely acquired once, wherein the number of the rotation speed signal cycles determines the length of the sampling time. The smaller the configured acquisition cycle number is, the shorter the required sampling time is, and the stronger the acquisition instantaneity is; the larger the number of acquisition cycles of the configuration, the longer the sampling time required, and the more robust. Suppose the configured rotation speed signal period number is m (m is more than or equal to 2).
The method for collecting the configurable rotating speed signal comprises the following steps:
step 1) obtaining an externally input rotating speed signal.
Step 2) synchronous processing of rotating speed signals:
continuously latching the rotating speed signal for three sampling clock periods by using a sampling clock so as to synchronize to a sampling clock domain;
because the externally input rotating speed signal and the sampling clock belong to different clock domains, in order to reduce the influence of the metastable state phenomenon, the externally input rotating speed signal is continuously latched by the sampling clock for three sampling clock periods.
Step 3), filtering the rotating speed signal:
carrying out continuous rotating speed signal filtering processing according to the configured filtering periodicity, wherein the configured filtering periodicity is assumed to be n;
sampling the synchronized rotating speed signal by a sampling clock, and outputting the synchronized rotating speed signal state when the state (high level or low level) of the sampled rotating speed signal continuously reaches more than n configured sampling clock periods;
sampling the synchronized rotation speed signal by a sampling clock, and if the state (high level or low level) of the sampled rotation speed signal is continuously less than n sampling clock cycles of the configured filtering cycles, maintaining the state of the rotation speed signal after last synchronization.
Step 4), sampling and counting of rotating speed signals:
performing edge detection on the filtered rotation speed signal, and when the same type of edge (rising edge or falling edge) is detected, counting the rotation speed signal period from an initial value of 0 to accumulate 1;
when the revolution speed signal cycle count is continuously accumulated to the configured revolution speed signal acquisition cycle number m, setting the revolution speed signal cycle count to be 1 when the same type of edge (rising edge or falling edge) is detected next time;
during the counting period (the value is from 1 to m) of a continuous revolution speed signal period, the sampling counting of the revolution speed signal is accumulated by 1 by using a sampling clock, and when the counting period of the next revolution speed signal period begins (the value is changed from m to 1), the current revolution speed signal sampling counting value (assumed to be p) is latched, the revolution speed signal sampling counting is juxtaposed to be 1, and the revolution speed signal sampling counting of the next sampling period is carried out.
And 5) outputting a rotating speed signal sampling result:
and the latched current rotating speed signal sampling count value p, the configured filtering period number n and the configured rotating speed signal period number m are latched once by the sampling clock and then output, so that other functions can be conveniently processed. In addition, the frequency of the finally obtained rotating speed signal according to the acquisition method is m x FS/p。
In the embodiment shown in fig. 2, let n be 3 and m be 2; wherein:
synchronous processing of rotating speed signals: the rotation speed signal is continuously latched with the sampling clock for three sampling clock cycles to synchronize to the sampling clock domain.
And (3) filtering the rotating speed signal: sampling the synchronized rotation speed signal by a sampling clock, wherein the rotation speed signal state (high level) reaches 3 sampling clock periods continuously at the beginning, so that the synchronized rotation speed signal state is output; and then, although the state of the synchronized rotation speed signal has a falling edge, the state only lasts for 1 sampling clock period (less than 3 sampling clock periods), and the state is regarded as an interference signal, so that the state of the rotation speed signal after the last synchronization is maintained and output until the state corresponds to the 7 th sampling clock (the rotation speed signal before filtering has a falling edge and lasts for more than 3 sampling clock periods). The latter speed signal states (high → low → high … …) all satisfy the active signal requirement.
Sampling and counting the rotating speed signals: performing edge detection on the filtered rotating speed signal, and accumulating 1 from an initial value of 0 to the value of a rotating speed signal period counter when a rising edge is detected; when the value of the revolution speed signal period counter is continuously added to 2, setting the value of the revolution speed signal period counter to 1 when the rising edge is detected next time, and starting the counting period (namely the sampling period) of the next revolution speed signal period counter; and in a continuous counting period (the numerical value is from 1 to 2) of the revolution signal period counter, the sampling counting of the revolution signal is accumulated by 1 by using a sampling clock, and when the counting period of the next revolution signal period counter begins (the numerical value is changed from 2 to 1), the current revolution signal sampling counting value 17 is latched, the revolution signal sampling counting value is set to be 1, and the revolution signal sampling counting of the next sampling period is carried out.
The method for acquiring the configurable rotating speed signal of the embodiment can be implemented by using programmable logic or an ASIC.
Compared with the traditional cycle measuring method and frequency measuring method, the method has the advantages that when the rotating speed signal is collected, the rotating speed signal to be collected is filtered according to the configured filtering cycle number, then the rotating speed signal is sampled and counted according to the configured rotating speed signal cycle number, and finally the result is latched once and then output. The method weakens unstable factors and errors caused by gear machining, vibration environment and the like, improves the flexibility of rotating speed signal acquisition and simultaneously increases the robustness of the system.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, many modifications and conventional adjustments can be made based on the present invention, and these modifications and conventional adjusted solutions should also be regarded as the protection scope of the present invention.
Claims (10)
1. A method of configurable tachometer signal acquisition, comprising:
step 1) acquiring an externally input rotating speed signal;
step 2) synchronous processing of rotating speed signals;
step 3) carrying out continuous rotating speed signal filtering processing according to a preset filtering periodicity n, wherein the filtering periodicity n is the sampling clock periodicity required by filtering, and n is more than or equal to 1;
step 4) sampling and counting the rotating speed signals according to a preset rotating speed signal period number m, wherein the rotating speed signal period number m represents the time for carrying out one-time effective sampling, and m is more than or equal to 2;
and 5) outputting a rotating speed signal sampling result.
2. The method according to claim 1, wherein step 3) is specifically:
sampling the synchronized rotating speed signal by a sampling clock;
if the sampled rotating speed signal state is less than n sampling clock cycles continuously, the rotating speed signal state after last synchronization is maintained and output as an interference signal;
and if the sampled rotating speed signal state continuously reaches more than n sampling clock cycles, outputting the synchronized rotating speed signal state.
3. The method according to claim 1, wherein step 4) is specifically:
carrying out edge detection on the filtered rotating speed signals, and carrying out cycle counting accumulation 1 on the rotating speed signals when the same type of edges are detected;
when the period count of the rotating speed signal is continuously accumulated to m, one effective sampling is finished; then when the same type of edge is detected next time, setting the period count of the rotating speed signal as 1 and starting the next sampling period;
and in a sampling period, carrying out sampling counting accumulation 1 on the rotation speed signal by using a sampling clock, latching a sampling counting value p of the current rotation speed signal when the next sampling period starts, and setting the sampling counting of the rotation speed signal to be 1.
4. The method according to claim 1, wherein step 2) is specifically: the externally input rotating speed signal is continuously latched for three sampling clock periods by using a sampling clock so as to be synchronized to a sampling clock domain.
5. The method according to claim 1, wherein step 5) is specifically: and latching and outputting the sampling count value p of the current rotating speed signal latched in the step 4), the configured filtering period number n and the configured rotating speed signal period number m.
6. A method of configurable tacho signal acquisition according to claim 1, characterized in that the method is implemented based on programmable logic or ASIC.
7. A configurable tachometer signal acquisition system, comprising:
the signal input module is used for acquiring an externally input rotating speed signal;
the synchronous processing module is used for synchronously processing the rotating speed signals;
the filtering processing module is used for carrying out continuous rotating speed signal filtering processing according to a preset filtering periodicity n, wherein the filtering periodicity n is the sampling clock periodicity required by filtering, and n is more than or equal to 1;
the signal sampling module is used for sampling and counting the rotating speed signals according to a preset rotating speed signal period number m, wherein the rotating speed signal period number m represents the time for carrying out one-time effective sampling, and m is more than or equal to 2;
and the signal output module is used for outputting the sampling result of the rotating speed signal.
8. A configurable tachometer signal generator system in accordance with claim 7, wherein:
the continuous rotating speed signal filtering processing is carried out according to the preset filtering periodicity n, and specifically comprises the following steps:
sampling the synchronized rotating speed signal by a sampling clock;
if the sampled rotating speed signal state is less than n sampling clock cycles continuously, the rotating speed signal state after last synchronization is maintained and output as an interference signal;
if the sampled rotating speed signal state continuously reaches more than n sampling clock cycles, outputting the synchronized rotating speed signal state;
the rotating speed signal sampling counting is carried out according to the preset rotating speed signal periodicity m, and specifically comprises the following steps:
carrying out edge detection on the filtered rotating speed signals, and carrying out cycle counting accumulation 1 on the rotating speed signals when the same type of edges are detected;
when the period count of the rotating speed signal is continuously accumulated to m, one effective sampling is finished; then when the same type of edge is detected next time, setting the period count of the rotating speed signal as 1 and starting the next sampling period;
and in a sampling period, carrying out sampling counting accumulation 1 on the rotation speed signal by using a sampling clock, latching a sampling counting value p of the current rotation speed signal when the next sampling period starts, and setting the sampling counting of the rotation speed signal to be 1.
9. A computer device comprising a processor and a memory, said memory storing a plurality of programs, wherein said programs when loaded and executed by the processor implement a method of configurable speed signal acquisition as claimed in any one of claims 1 to 6.
10. A computer readable storage medium storing a plurality of programs, wherein when loaded and executed by a processor, the programs implement a method of configurable tachometer signal collection according to any one of claims 1 to 6.
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