CN115824266A - Signal processing method and device based on wheel sensor processing device - Google Patents
Signal processing method and device based on wheel sensor processing device Download PDFInfo
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Abstract
The invention discloses a signal processing method and a signal processing device based on a wheel sensor processing device, and relates to a method and a device for filtering interference signals of a wheel sensor. The purpose is in order to overcome the wheel sensor processing apparatus and to the rate of recognition of signal lower, and lead to crossing the inaccurate location of point location to the vehicle is tested the speed, is tested the axle distance and is tested the problem that the speed deviates, and wherein the method includes: step one, pre-positioning the zero crossing point of the magnetic steel excitation signal, and executing step two; judging whether the amplitude and the width of the generated magnetic steel excitation signal are respectively greater than a noise threshold voltage value and a signal width threshold value; if the values are all larger than the preset value, executing a step three; step three, judging whether the positive half shaft waveform of the magnetic steel excitation signal is similar to a sine wave or not; if the positive half-axis waveform of the magnetic steel excitation signal is similar to a sine wave, executing the step four; step four, judging whether the negative half shaft of the magnetic steel excitation signal is complete; and if the negative half shaft of the magnetic steel excitation signal is complete, outputting a square wave corresponding to the magnetic steel excitation signal.
Description
Technical Field
The invention relates to a method and a device for filtering interference signals of a wheel sensor.
Background
In a railway environment, external interference conditions, such as electromagnetic interference, vibration interference, railway backflow interference and the like, are more, and interference signals are generated. And partial interference signals are close to the vehicle passing signals generated by the actual magnetic steel and are not easy to distinguish. The prior art often adopts the following method for noise filtering:
(1) the magnetic steel signal is judged by adopting a voltage comparator, and the amplification factor and the bandwidth of the front end of the voltage comparator are changed, and the noise threshold voltage is limited. Magnetic steel signals above the threshold are considered to be valid signals, and magnetic steel signals below the threshold are considered to be invalid interference signals. However, in a low-speed running state and a (< 5 km/h) and a high-speed running state (> 100 km/h), an actual signal is still close to an interference signal and is not easy to distinguish, and the problems of magnetic steel counting, shaft missing, multi-shaft and the like are easy to occur.
(2) And performing spectrum analysis processing through a special CPU processor. However, the method has low recognition rate on partial section signals, and leads to inaccurate zero crossing point positioning, so that vehicle speed measurement, axle distance measurement and speed measurement deviation occur.
Disclosure of Invention
The invention aims to solve the problems that the existing wheel sensor processing device has low signal recognition rate and causes inaccurate zero crossing point positioning, so that the vehicle speed measurement and the axle distance measurement have deviation, and provides a signal processing method and a signal processing device based on the wheel sensor processing device.
The invention provides a signal processing method based on a wheel sensor processing device, which comprises the following specific steps:
step one, pre-positioning the zero crossing point of the magnetic steel excitation signal, and executing step two when the amplitude of the magnetic steel excitation signal is between-0.1V and 0.1V;
step two, judging whether the amplitude of the generated magnetic steel excitation signal is larger than a noise threshold voltage value or not and whether the width value of the generated magnetic steel excitation signal is larger than a signal width threshold value or not;
if the amplitude of the magnetic steel excitation signal is larger than the noise threshold voltage value and the width value is larger than the signal width threshold value, executing a third step;
otherwise, judging the magnetic steel excitation signal as an interference signal, and filtering the magnetic steel excitation signal;
step three, judging whether the positive half shaft waveform of the magnetic steel excitation signal is similar to a sine wave or not;
if the positive half-axis waveform of the magnetic steel excitation signal is similar to a sine wave, executing the step four;
otherwise, filtering the magnetic steel excitation signal;
step four, judging whether the magnetic steel excitation signal negative half shaft is complete;
if the negative half shaft of the magnetic steel excitation signal is complete, outputting a square wave corresponding to the magnetic steel excitation signal;
otherwise, filtering the magnetic steel excitation signal.
The first step is that the specific steps of positioning the zero crossing point of the magnetic steel excitation signal are as follows:
initializing a wheel sensor processing device, and setting various data to zero;
step two, removing redundant data; the redundant data is data in set time after initialization;
and step three, acquiring the voltage acquired by the sampling chip, accumulating the voltage, then calculating an average value, and outputting an average calibration value which is taken as a zero crossing point.
In the second step, the noise threshold voltage value and the signal width threshold value are respectively obtained by the following method:
starting from 1km/h, taking 1km/h as stepping, and recording the amplitude of a magnetic steel excitation signal generated by pressing a wheel on the surface of magnetic steel corresponding to the speed of each stepping; and the amplitude of the magnetic steel excitation signal corresponding to 0.8 time of the lowest vehicle speed in the previous operation period is used as the noise threshold voltage;
starting from 1km/h, taking 1km/h as stepping, and recording the width value of a magnetic steel excitation signal generated by pressing a wheel on the surface of magnetic steel corresponding to the speed of each stepping; and the width value of the magnetic steel excitation signal corresponding to the highest speed of 1.2 times in the previous operation period is used as a signal width threshold value.
Wherein, the third step is specifically as follows:
step three, calculating the accumulated value S of the signal sampling voltage value 1 Sum signal amplitude voltage accumulated value S 2 ；
Wherein, V c For sampling voltage, V p Is the maximum voltage; t is t 1 The time point when the amplitude of the magnetic steel excitation signal reaches the noise threshold voltage value for the first time is set; v max Is the maximum value of the magnetic steel excitation signal, and the corresponding time point is t 2 ；t 3 Corresponding time points for zero crossing points;
step three and two, comparing the accumulated value S of the sampling voltage values of the signals 1 Sum signal amplitude voltage accumulated value S 2 And when
And judging that the positive half-axis waveform of the magnetic steel excitation signal is similar to a sine wave.
Wherein, the fourth step is as follows:
step four, carrying out 1/8 signal width delay output on the square wave output by the zero crossing point;
step two, after judging the 1/8 signal width of delay, whether the magnetic steel excitation signal amplitude corresponding to the delay time point is lower than-1/4 noise threshold voltage;
if the voltage is lower than the-1/4 noise threshold voltage, judging the magnetic steel excitation signal as an effective signal, and outputting a square wave corresponding to the magnetic steel excitation signal;
otherwise, judging the signal as an interference signal and filtering the signal.
The present invention also provides a signal processing apparatus based on a wheel sensor processing apparatus, comprising:
the zero crossing point calibration module is used for positioning the zero crossing point of the magnetic steel excitation signal in advance and sending the zero crossing point to the threshold value judgment module when the amplitude of the magnetic steel excitation signal is between-0.1V and 0.1V;
the threshold judging module is used for judging whether the amplitude of the generated magnetic steel excitation signal is larger than the noise threshold voltage value or not and whether the width value of the generated magnetic steel excitation signal is larger than the signal width threshold value or not;
if the amplitude of the magnetic steel excitation signal is larger than the noise threshold voltage value and the width value is larger than the signal width threshold value, the magnetic steel excitation signal is sent to a positive half shaft judgment module;
otherwise, judging the magnetic steel excitation signal as an interference signal, and filtering the magnetic steel excitation signal;
the positive half shaft judgment module is used for judging whether the positive half shaft waveform of the magnetic steel excitation signal is similar to a sine wave or not;
if the positive half shaft waveform of the magnetic steel excitation signal is similar to a sine wave, the positive half shaft waveform is sent to a negative half shaft judgment module;
otherwise, filtering the magnetic steel excitation signal;
the negative half shaft judging module is used for judging whether the negative half shaft of the magnetic steel excitation signal is complete or not;
if the negative half shaft of the magnetic steel excitation signal is complete, outputting a square wave corresponding to the magnetic steel excitation signal;
otherwise, filtering the magnetic steel excitation signal.
Wherein, zero crossing point calibration module includes:
the initialization module is used for initializing the wheel sensor processing device and setting various data to zero;
the redundant data deleting module is used for eliminating redundant data; the redundant data is data in set time after initialization;
and the calibration data accumulation and averaging module is used for acquiring the voltage acquired by the sampling chip, averaging after accumulation, and outputting an average calibration value as a zero crossing point.
In the threshold judgment module, the noise threshold voltage value and the signal width threshold value are respectively obtained by the following methods:
starting from 1km/h, taking 1km/h as stepping, and recording the amplitude of a magnetic steel excitation signal generated by pressing a wheel on the surface of magnetic steel corresponding to the speed of each stepping; and the amplitude of the magnetic steel excitation signal corresponding to 0.8 time of the lowest vehicle speed in the previous operation period is used as the noise threshold voltage;
starting from 1km/h, taking 1km/h as stepping, and recording the width value of a magnetic steel excitation signal generated by pressing a wheel on the surface of magnetic steel corresponding to the speed of each stepping; and the width value of the magnetic steel excitation signal corresponding to the highest speed of 1.2 times in the previous operation period is used as a signal width threshold value.
Wherein, the sine wave judging module includes:
an accumulated value calculating module for calculating the accumulated value S of the signal sampling voltage value according to the following formula 1 Sum signal amplitude voltage accumulated value S 2 And sending the data to an accumulated value comparison module;
wherein, V c For sampling voltage, V p Is the maximum voltage; t is t 1 The time point when the amplitude of the magnetic steel excitation signal reaches the noise threshold voltage value for the first time is set; v max Is the maximum value of the magnetic steel excitation signal, and the corresponding time point is t 2 ；t 3 Corresponding time points for zero crossing points;
an accumulated value comparison module for comparing the accumulated value S of the signal sampling voltage value 1 Sum signal amplitude voltage accumulated value S 2 And when
And judging that the positive half-axis waveform of the magnetic steel excitation signal is similar to a sine wave.
Wherein, square wave output module includes:
the delay module is used for carrying out 1/8 signal width delay output on the square wave output by the zero crossing point;
judging whether the amplitude of the magnetic steel excitation signal corresponding to the delay time point is lower than-1/4 noise threshold voltage or not after 1/8 signal width delay; if the voltage is lower than the-1/4 noise threshold voltage, the magnetic steel excitation signal is judged to be an effective signal and is sent to the square wave output module;
otherwise, judging as an interference signal and filtering
And the square wave output module is used for outputting the square wave corresponding to the magnetic steel excitation signal.
The invention has the beneficial effects that:
the signal processing method based on the wheel sensor processing device has the self-checking function, can filter interference in the process of positioning the zero crossing point, accurately positions the zero crossing point and avoids speed measurement or axle measurement errors.
And the signal recognition rate can be improved by:
1. the noise threshold voltage and signal width threshold can be automatically configured:
according to the signal processing method based on the wheel sensor processing device, the noise threshold voltage and the signal width threshold value of the section can be automatically set periodically according to the speed conditions of different railway sections on site, so that signal interference which does not meet the waveform parameter condition is filtered.
2. Peak detection can be performed, and the signal type is judged:
the signal processing method based on the wheel sensor processing device can detect the peak value of the signal, determine the area of the signal by monitoring the peak value of the signal in real time in the whole process, and judge the waveform of the signal, thereby filtering noise interference which does not accord with the waveform type condition.
3. The delay output can be carried out, and the signal integrity is judged:
according to the signal processing method based on the wheel sensor processing device, square wave output can be carried out after a period of time is delayed after a zero crossing point, the signal amplitude of the position is judged, and the integrity of a signal negative half shaft is judged and guaranteed, so that noise interference which does not meet the waveform integrity condition is filtered.
Drawings
Fig. 1 is a schematic diagram of a signal processing method based on a wheel sensor processing device according to the present invention;
fig. 2 is a flow chart of a signal processing method based on a wheel sensor processing device according to the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.
Detailed description of the invention
A signal processing method based on a wheel sensor processing device according to this embodiment includes the following specific steps:
step one, pre-positioning the zero crossing point of the magnetic steel excitation signal, and executing step two when the amplitude of the magnetic steel excitation signal is between-0.1V and 0.1V;
judging whether the amplitude of the generated magnetic steel excitation signal is larger than a noise threshold voltage value or not and whether the width value of the magnetic steel excitation signal is larger than a signal width threshold value or not;
if the amplitude of the magnetic steel excitation signal is larger than the noise threshold voltage value and the width value is larger than the signal width threshold value, executing a third step;
otherwise, judging the magnetic steel excitation signal as an interference signal, and filtering the magnetic steel excitation signal;
step three, judging whether the positive half shaft waveform of the magnetic steel excitation signal is similar to a sine wave or not;
if the positive half-axis waveform of the magnetic steel excitation signal is similar to a sine wave, executing the step four;
otherwise, filtering the magnetic steel excitation signal;
step four, judging whether the negative half shaft of the magnetic steel excitation signal is complete;
if the negative half shaft of the magnetic steel excitation signal is complete, outputting a square wave corresponding to the magnetic steel excitation signal;
otherwise, filtering the magnetic steel excitation signal.
Detailed description of the invention
In this embodiment, the first step is to locate the zero crossing point of the magnetic steel excitation signal as follows:
initializing a wheel sensor processing device, and setting various data to zero;
step two, removing redundant data; the redundant data is data in set time after initialization;
and step three, acquiring the voltage acquired by the sampling chip, accumulating the voltage, then averaging the voltage, and outputting an average calibration value which is used as a zero crossing point.
Other technical solutions of the present embodiment are completely the same as those of the first embodiment.
Detailed description of the invention
In this embodiment, in the second step, the noise threshold voltage value and the signal width threshold value are obtained by the following methods:
starting from 1km/h, taking 1km/h as stepping, and recording the amplitude of a magnetic steel excitation signal generated by pressing a wheel on the surface of magnetic steel corresponding to the speed of each stepping; and the amplitude of the magnetic steel excitation signal corresponding to 0.8 time of the lowest vehicle speed in the previous operation period is used as the noise threshold voltage;
starting from 1km/h, taking 1km/h as stepping, and recording the width value of a magnetic steel excitation signal generated by pressing a wheel on the surface of magnetic steel corresponding to the speed of each stepping; and the width value of the magnetic steel excitation signal corresponding to the highest speed of 1.2 times in the previous operation period is used as a signal width threshold value.
The other technical means of the present embodiment are completely the same as those of the second embodiment.
Detailed description of the invention
The third embodiment is further described, and in the third embodiment, the third step is specifically:
step three, calculating the accumulated value S of the signal sampling voltage value 1 Sum signal amplitude voltage accumulated value S 2 ；
Wherein, V c For sampling voltage, V p Is the maximum voltage; t is t 1 The time point when the amplitude of the magnetic steel excitation signal reaches the noise threshold voltage value for the first time is set; v max Is the maximum value of the magnetic steel excitation signal, and the corresponding time point is t 2 ；t 3 Corresponding time points for zero crossing points;
step three and two, comparing the accumulated value S of the sampling voltage values of the signals 1 Sum signal amplitude voltage accumulated value S 2 And when
And judging that the positive half-axis waveform of the magnetic steel excitation signal is similar to a sine wave.
Other technical means of the present embodiment are completely the same as those of the third embodiment.
Detailed description of the invention
The fourth embodiment is further described, and in the fourth embodiment, the specific steps are as follows:
step four, performing 1/8 signal width delay output on the square wave output from the zero crossing point;
step two, after judging the 1/8 signal width of delay, whether the magnetic steel excitation signal amplitude corresponding to the delay time point is lower than-1/4 noise threshold voltage;
if the voltage is lower than the-1/4 noise threshold voltage, judging the magnetic steel excitation signal as an effective signal, and outputting a square wave corresponding to the magnetic steel excitation signal;
otherwise, judging the signal as an interference signal and filtering the signal.
The other technical means of the present embodiment are exactly the same as those of the fourth embodiment.
Detailed description of the invention
A signal processing device according to the present embodiment includes:
the zero crossing point calibration module is used for positioning the zero crossing point of the magnetic steel excitation signal in advance and sending the zero crossing point to the threshold value judgment module when the amplitude of the magnetic steel excitation signal is between-0.1V and 0.1V;
the threshold judging module is used for judging whether the amplitude of the generated magnetic steel excitation signal is larger than a noise threshold voltage value or not and whether the width value of the magnetic steel excitation signal is larger than a signal width threshold value or not;
if the amplitude of the magnetic steel excitation signal is larger than the noise threshold voltage value and the width value is larger than the signal width threshold value, the magnetic steel excitation signal is sent to a positive half shaft judgment module;
otherwise, judging the magnetic steel excitation signal as an interference signal, and filtering the magnetic steel excitation signal;
the positive half shaft judgment module is used for judging whether the positive half shaft waveform of the magnetic steel excitation signal is similar to a sine wave or not;
if the positive half shaft waveform of the magnetic steel excitation signal is similar to a sine wave, the magnetic steel excitation signal is sent to a negative half shaft judgment module;
otherwise, filtering the magnetic steel excitation signal;
the negative half shaft judging module is used for judging whether the negative half shaft of the magnetic steel excitation signal is complete or not;
if the negative half shaft of the magnetic steel excitation signal is complete, outputting a square wave corresponding to the magnetic steel excitation signal;
otherwise, filtering the magnetic steel excitation signal.
Detailed description of the invention
In this embodiment, the zero-crossing point calibration module includes:
the initialization module is used for initializing the wheel sensor processing device and setting various data to zero;
the redundant data deleting module is used for eliminating redundant data; the redundant data is data in set time after initialization;
and the calibration data accumulation and averaging module is used for acquiring the voltage acquired by the sampling chip, averaging after accumulation, and outputting an average calibration value as a zero crossing point.
The other technical means of the present embodiment are exactly the same as those of the sixth embodiment.
Detailed description of the invention
In this embodiment, the threshold determination module obtains the noise threshold voltage value and the signal width threshold value by the following method:
starting from 1km/h, taking 1km/h as stepping, and recording the amplitude of a magnetic steel excitation signal generated by pressing a wheel on the surface of magnetic steel corresponding to the speed of each stepping; and the amplitude of the magnetic steel excitation signal corresponding to 0.8 time of the lowest vehicle speed in the previous operation period is used as the noise threshold voltage;
starting from 1km/h, taking 1km/h as stepping, and recording the width value of a magnetic steel excitation signal generated by pressing a wheel on the surface of magnetic steel corresponding to the speed of each stepping; and the width value of the magnetic steel excitation signal corresponding to the highest speed of 1.2 times in the previous operation period is used as a signal width threshold value.
The other technical means of the present embodiment are completely the same as those of the seventh embodiment.
Detailed description of the invention
In this embodiment, the sine wave determination module includes:
an accumulated value calculating module for calculating the accumulated value S of the signal sampling voltage value according to the following formula 1 Sum signal amplitude voltage accumulationAdded value S 2 And sending the data to an accumulated value comparison module;
wherein, V c For sampling voltages, V p Is the maximum voltage; t is t 1 The time point when the amplitude of the magnetic steel excitation signal reaches the noise threshold voltage value for the first time; v max Is the maximum value of the magnetic steel excitation signal, and the corresponding time point is t 2 ；t 3 Corresponding time points for zero crossing points;
an accumulated value comparison module for comparing the accumulated value S of the signal sampling voltage value 1 Sum signal amplitude voltage accumulated value S 2 And when
And judging that the positive half-axis waveform of the magnetic steel excitation signal is similar to a sine wave.
The other technical means of the present embodiment are completely the same as those of the eighth embodiment.
Detailed description of the preferred embodiment
In this embodiment, the square wave output module includes:
the delay module is used for carrying out 1/8 signal width delay output on the square wave output by the zero crossing point;
judging whether the amplitude of the magnetic steel excitation signal corresponding to the delay time point is lower than-1/4 noise threshold voltage or not after 1/8 signal width delay; if the voltage is lower than the-1/4 noise threshold voltage, the magnetic steel excitation signal is judged to be an effective signal and is sent to the square wave output module;
otherwise, judging as an interference signal and filtering
And the square wave output module is used for outputting the square wave corresponding to the magnetic steel excitation signal.
The other technical means of the present embodiment are completely the same as those of the ninth embodiment.
Examples
As shown in fig. 2, the zero-crossing point of the present embodiment is determined by the self-checking mode. In the self-checking mode, firstly, equipment needs to be initialized, a sampling chip is reset, and various data are set to zero; then data elimination is carried out, the data (redundant data) of the first 2s are eliminated, and input signal oscillation when the equipment is started is prevented; then, calibration data is carried out, namely, the voltage (the voltage of a magnetic steel excitation signal or the voltage of an interference signal) collected by the sampling chip is obtained, the voltage is accumulated and then averaged, and a calibration value, namely a zero crossing point, is output; and finally, finishing the calibration setting and outputting a calibration finishing mark. When the output calibration value is between the code values corresponding to-0.1V, the self-checking is finished, the zero-crossing point value is effective, otherwise, the self-checking is carried out again until the calibration value meets the condition.
As shown in fig. 2, the present embodiment is a signal processing method based on a wheel sensor processing device. Because the magnetic steel is generally installed near the vehicle entering and exiting station, if the vehicle stops at the station, the vehicle speed is lower when passing through the magnetic steel installation area; if the vehicle only goes to the station and does not stop, the vehicle speed will be higher when passing through the magnetic steel mounting area.
The magnetic steel excitation signal comprises a signal generated by wheel pressing and an external interference signal.
The signal amplitude of a standard vehicle corresponding to the vehicle speed which starts from 1km/h and is stepped by 1km is summarized through the use of the equipment on site and the accumulation of past experience, the signal amplitude of each vehicle speed is recorded as a corresponding noise threshold voltage Vts, and the noise threshold voltage corresponding to 1km/h is recorded as a V ts1 The noise threshold voltage corresponding to 2km/h is V ts2 823060 parts by volume V tsn Then the noise threshold voltage setting is made according to the station's prevailing lowest speed. Similarly, the signal widths of the standard vehicles corresponding to the vehicle speeds from 1km/h in steps of 1km are summarized, and the signal width of each vehicle speed is recorded as the corresponding signal width threshold value T n (distance from the abscissa corresponding to the vehicle speed to the origin of coordinates). The threshold value of the signal width corresponding to 1km/h is T 1 And the threshold value of the signal width of 2km/h is T 2 8230and up to T n And thus signal width threshold setting is performed according to the highest speed of the station.
The noise threshold voltage data and the signal width threshold data which are arranged in the method can be stored in an internal memory, and automatic adaptation is carried out according to the vehicle speed in the field cycle time. The method takes a month as a period, and at the beginning of each period node, the speed of the passing vehicle in the previous period is counted to obtain the lowest vehicle speed and the highest vehicle speed. In order to reduce the measurement error, the signal amplitude corresponding to 0.8 times of the lowest vehicle speed is selected as the corresponding noise threshold voltage, and the signal width corresponding to 1.2 times of the highest vehicle speed is selected as the signal width threshold value. It should be clear that 0.8 times of signal amplitude and 1.2 times of signal width are the best choices for the implementation of this embodiment, but if the signal amplitude and 1.2 times of signal width are not limited to 0.8 times of signal amplitude and 1.2 times of signal width, a certain range, such as 0.6 to 1 times of signal amplitude and 1 to 1.4 times of signal width, may be selected in order to meet the limitations of other conditions or change the sensitivity of signal identification during the implementation.
For example, the following steps are carried out: if the lowest speed of the magnetic steel section installed through the station is the speed A, the amplitude of a signal generated by the vehicle pressure of the section on the surface of the magnetic steel is certainly larger than that of a signal generated by the vehicle pressure corresponding to the speed A on the surface of the magnetic steel, and the device is set by adopting a noise threshold voltage value corresponding to 0.8 time of the speed A. Therefore, the magnetic steel signals higher than the noise threshold voltage are preliminarily judged to be effective signals, and the magnetic steel signals lower than the noise threshold voltage are considered to be ineffective interference and are filtered.
If the highest speed of the magnetic steel section installed through the station is the speed B, the width of a signal generated by the vehicle pressing the surface of the magnetic steel in the section is considered to be larger than the width of a signal generated by the vehicle pressing the surface of the magnetic steel corresponding to the speed B, and the device is set by adopting a signal width threshold value which is 1.2 times of the speed B. Therefore, the magnetic steel signals higher than the signal width threshold are preliminarily judged to be effective signals, and the magnetic steel signals smaller than the signal width threshold are considered to be ineffective interferences and are filtered.
As shown in fig. 1, the signal processing method based on the wheel sensor processing device of the present embodiment includes a peak detection function. When the signal reaches the noise threshold voltage, peak detection is turned on. The function is mainly used for the waveform shape of the magnetic steel excitation signal. The logic for peak detection is: comparing the sampling voltage Vc of each time point of the magnetic steel excitation signal acquired by the sampling chip with the maximum voltage Vp, and keeping the value of Vp when Vc is less than or equal to Vp; when Vc > Vp, vp = Vc.
Setting the time point when the waveform amplitude of the magnetic steel excitation signal reaches the noise threshold voltage for the first time as t 1 The maximum value in the whole period is Vmax and the time point is t 2 Zero crossing point of t 3 The accumulated value of the signal sampling voltage value is S 1 The accumulated value of the amplitude and voltage of the signal is S 2 . The calculation formula is as follows:
therefore, when
Then we consider the signal to be approximately regarded as the positive half axis of a sine wave, which is a valid signal. When in use
When the signal is received, the signal is considered as an interference signal and is filtered.
As shown in fig. 1, the signal processing method based on the wheel sensor processing device of the present embodiment includes a delay output function. The function is mainly used for judging whether a waveform negative half shaft generated after a vehicle is pressed on the surface of the magnetic steel is complete or not. The logic of the delay output function is: normally, when the signal is at the zero crossing point each time, a square wave with fixed parameters is synchronously output. Working methodWhen the delay function is turned on, the output square wave is delayed
Outputting the signal again in the width of the signal, and if the amplitude of the signal is lower than that of the signal
If the noise threshold voltage value is higher than the threshold voltage value, the signal is judged to be an effective signal, and if the signal amplitude value is higher than the threshold voltage value at the moment
The noise threshold voltage value is judged as an interference signal, and the interference signal is filtered. It should be clear that the delay is by a corresponding square wave
The width of each signal, and further judging whether the amplitude of the corresponding signal is lower than that of the corresponding signal
The noise threshold voltage value of (2) is the best choice for the implementation of this embodiment, but if the implementation is not limited to the delayed square wave
The width of the signal can be selected within a certain range, such as square wave delay
The width of each signal, and whether the amplitude of the corresponding signal is lower than that of the corresponding signal
The noise threshold voltage value (the specific value of n can be solved by substituting the specific parameter).
As shown in fig. 2, the signal processing method based on the wheel sensor processing device of the present embodiment mainly includes the following steps:
(1) starting a self-checking function, carrying out data calibration, positioning a zero crossing point, judging whether the amplitude is between-0.1V and 0.1V, if the amplitude is in a range interval, representing that the calibration is successful, carrying out the next step, and if the amplitude is not in the range interval, carrying out self-checking again;
(2) the vehicle presses the magnetic steel to generate an excitation signal;
(3) judging whether the amplitude and the width of the magnetic steel excitation signal are larger than the noise threshold voltage and the signal width threshold value or not, if so, carrying out the next step, otherwise, judging the magnetic steel excitation signal as an interference signal, and filtering;
(4) starting peak value detection, superposing the sampling voltage and the peak value voltage, judging through the area, judging whether the positive half shaft waveform of the signal is similar to a sine wave, and when the positive half shaft waveform of the signal is similar to the sine wave, judging whether the positive half shaft waveform of the signal is similar to the sine wave
If the interference signal is not the interference signal, filtering;
(5) starting a delay output function, carrying out 1/8 signal width delay on the square wave output at the zero crossing point, then carrying out square wave output, judging whether the voltage corresponding to the time point is lower than-1/4 noise threshold voltage, if so, carrying out the next step, otherwise, judging as an interference signal, and filtering;
(6) and outputting square waves for judging the axle, the vehicle type, the vehicle speed and the like.
Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that features from different dependent claims and herein may be combined in ways other than those described in the original claims. It is also to be understood that features described in connection with individual embodiments may be used in other embodiments.
Claims (10)
1. A signal processing method based on a wheel sensor processing device is characterized by comprising the following specific steps:
step one, pre-positioning a zero crossing point of a magnetic steel excitation signal, and executing step two when the amplitude of the magnetic steel excitation signal is between-0.1V and 0.1V;
judging whether the amplitude of the generated magnetic steel excitation signal is larger than a noise threshold voltage value or not and whether the width value of the magnetic steel excitation signal is larger than a signal width threshold value or not;
if the amplitude of the magnetic steel excitation signal is larger than the noise threshold voltage value and the width value is larger than the signal width threshold value, executing a third step;
otherwise, judging the magnetic steel excitation signal as an interference signal, and filtering the magnetic steel excitation signal;
step three, judging whether the positive half shaft waveform of the magnetic steel excitation signal is similar to a sine wave or not;
if the positive half-axis waveform of the magnetic steel excitation signal is similar to a sine wave, executing the step four;
otherwise, filtering the magnetic steel excitation signal;
step four, judging whether the negative half shaft of the magnetic steel excitation signal is complete;
if the negative half shaft of the magnetic steel excitation signal is complete, outputting a square wave corresponding to the magnetic steel excitation signal;
otherwise, filtering the magnetic steel excitation signal.
2. The signal processing method based on the wheel sensor processing device according to claim 1, wherein the step one of locating the zero-crossing point of the magnetic steel excitation signal is as follows:
initializing a wheel sensor processing device, and setting various data to zero;
step two, removing redundant data; the redundant data is data in set time after initialization;
and step three, acquiring the voltage acquired by the sampling chip, accumulating the voltage, then averaging the voltage, and outputting an average calibration value which is used as a zero crossing point.
3. The signal processing method based on the wheel sensor processing device according to claim 2, wherein in the second step, the noise threshold voltage value and the signal width threshold value are obtained by the following method:
starting from 1km/h, taking 1km/h as stepping, and recording the amplitude of a magnetic steel excitation signal generated by pressing a wheel on the surface of magnetic steel corresponding to the speed of each stepping; and the amplitude of the magnetic steel excitation signal corresponding to 0.8 time of the lowest vehicle speed in the previous operation period is used as the noise threshold voltage;
starting from 1km/h, taking 1km/h as stepping, and recording the width value of a magnetic steel excitation signal generated on the surface of magnetic steel by a wheel press corresponding to the speed of each stepping; and the width value of the magnetic steel excitation signal corresponding to the highest speed of 1.2 times in the previous operation period is used as a signal width threshold value.
4. The signal processing method based on the wheel sensor processing device according to claim 3, wherein the third step is specifically:
step three, calculating the accumulated value S of the signal sampling voltage value 1 Sum signal amplitude voltage accumulated value S 2 ；
Wherein, V c For sampling voltages, V p Is the maximum voltage; t is t 1 The time point when the amplitude of the magnetic steel excitation signal reaches the noise threshold voltage value for the first time is set; v max Is the maximum value of the magnetic steel excitation signal, and the corresponding time point is t 2 ；t 3 The time point corresponds to the zero crossing point;
step three and two, comparing the accumulated value S of the sampling voltage values of the signals 1 Sum signal amplitude voltage accumulated value S 2 And when
And judging that the positive half-axis waveform of the magnetic steel excitation signal is similar to a sine wave.
5. The signal processing method based on the wheel sensor processing device according to claim 4, wherein the fourth step is as follows:
step four, carrying out 1/8 signal width delay output on the square wave output by the zero crossing point;
step two, after judging the 1/8 signal width of delay, whether the magnetic steel excitation signal amplitude corresponding to the delay time point is lower than-1/4 noise threshold voltage;
if the voltage is lower than the-1/4 noise threshold voltage, judging the magnetic steel excitation signal as an effective signal, and outputting a square wave corresponding to the magnetic steel excitation signal;
otherwise, judging the signal as an interference signal and filtering the signal.
6. A signal processing device based on a wheel sensor processing device, comprising:
the zero crossing point calibration module is used for positioning the zero crossing point of the magnetic steel excitation signal in advance and sending the zero crossing point to the threshold value judgment module when the amplitude of the magnetic steel excitation signal is between-0.1V and 0.1V;
the threshold judging module is used for judging whether the amplitude of the generated magnetic steel excitation signal is larger than a noise threshold voltage value or not and whether the width value of the magnetic steel excitation signal is larger than a signal width threshold value or not;
if the amplitude of the magnetic steel excitation signal is larger than the noise threshold voltage value and the width value is larger than the signal width threshold value, the magnetic steel excitation signal is sent to a positive half shaft judgment module;
otherwise, judging the magnetic steel excitation signal as an interference signal, and filtering the magnetic steel excitation signal;
the positive half shaft judgment module is used for judging whether the positive half shaft waveform of the magnetic steel excitation signal is similar to a sine wave or not;
if the positive half shaft waveform of the magnetic steel excitation signal is similar to a sine wave, the positive half shaft waveform is sent to a negative half shaft judgment module;
otherwise, filtering the magnetic steel excitation signal;
the negative half shaft judging module is used for judging whether the magnetic steel excitation signal negative half shaft is complete or not;
if the negative half shaft of the magnetic steel excitation signal is complete, outputting a square wave corresponding to the magnetic steel excitation signal;
otherwise, filtering the magnetic steel excitation signal.
7. The signal processing device based on the wheel sensor processing device according to claim 6, wherein the zero crossing point calibration module comprises:
the initialization module is used for initializing the wheel sensor processing device and setting various data to zero;
the redundant data deleting module is used for eliminating redundant data; the redundant data is data in set time after initialization;
and the calibration data accumulation and averaging module is used for acquiring the voltage acquired by the sampling chip, averaging after accumulation and outputting an average calibration value, wherein the average calibration value is used as a zero crossing point.
8. The signal processing device based on the wheel sensor processing device as claimed in claim 7, wherein the threshold value judging module is configured to obtain the noise threshold voltage value and the signal width threshold value respectively by:
starting from 1km/h, taking 1km/h as stepping, and recording the amplitude of a magnetic steel excitation signal generated by pressing a wheel on the surface of magnetic steel corresponding to the speed of each stepping; and the amplitude of the magnetic steel excitation signal corresponding to 0.8 time of the lowest vehicle speed in the previous operation period is used as the noise threshold voltage;
starting from 1km/h, taking 1km/h as stepping, and recording the width value of a magnetic steel excitation signal generated by pressing a wheel on the surface of magnetic steel corresponding to the speed of each stepping; and the width value of the magnetic steel excitation signal corresponding to the highest speed of 1.2 times in the previous operation period is used as a signal width threshold value.
9. The signal processing device based on the wheel sensor processing device as claimed in claim 8, wherein the sine wave determining module comprises:
an accumulated value calculation module for calculating the accumulated value S of the signal sampling voltage value according to the following formula 1 Sum signal amplitude voltage accumulated value S 2 And sending the data to an accumulated value comparison module;
wherein, V c For sampling voltage, V p Is the maximum voltage; t is t 1 The time point when the amplitude of the magnetic steel excitation signal reaches the noise threshold voltage value for the first time is set; v max Is the maximum value of the magnetic steel excitation signal, and the corresponding time point is t 2 ；t 3 Corresponding time points for zero crossing points;
an accumulated value comparison module for comparing the accumulated value S of the signal sampling voltage value 1 Sum signal amplitude voltage accumulated value S 2 And when
And judging that the positive half-axis waveform of the magnetic steel excitation signal is similar to a sine wave.
10. The signal processing device based on the wheel sensor processing device as claimed in claim 9, wherein the square wave output module comprises:
the delay module is used for carrying out 1/8 signal width delay output on the square wave output by the zero crossing point;
judging whether the amplitude of the magnetic steel excitation signal corresponding to the delay time point is lower than-1/4 noise threshold voltage or not after 1/8 signal width delay; if the voltage is lower than the-1/4 noise threshold voltage, the magnetic steel excitation signal is judged to be an effective signal and is sent to the square wave output module;
otherwise, judging as an interference signal and filtering
And the square wave output module is used for outputting the square wave corresponding to the magnetic steel excitation signal.
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