CN108593155B - Signal conditioning module of grain loss sensor - Google Patents
Signal conditioning module of grain loss sensor Download PDFInfo
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- 239000003550 marker Substances 0.000 claims description 2
- 235000013339 cereals Nutrition 0.000 description 88
- 239000002033 PVDF binder Substances 0.000 description 7
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 7
- 239000002245 particle Substances 0.000 description 5
- 238000003306 harvesting Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 239000011538 cleaning material Substances 0.000 description 2
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- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/16—Measuring force or stress, in general using properties of piezoelectric devices
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01D—HARVESTING; MOWING
- A01D41/00—Combines, i.e. harvesters or mowers combined with threshing devices
- A01D41/12—Details of combines
- A01D41/127—Control or measuring arrangements specially adapted for combines
- A01D41/1271—Control or measuring arrangements specially adapted for combines for measuring crop flow
- A01D41/1272—Control or measuring arrangements specially adapted for combines for measuring crop flow for measuring grain flow
- A01D41/1273—Control or measuring arrangements specially adapted for combines for measuring crop flow for measuring grain flow for measuring grain loss
Abstract
The invention discloses a signal conditioning module of a grain loss sensor. The upper sensing module and the lower sensing module of the grain loss sensor are connected to the input end of the multi-channel signal synchronous acquisition unit through respective conditioning circuit units, and the multi-channel signal synchronous acquisition unit synchronously acquires output signals of the upper sensing module and the lower sensing module conditioned by the conditioning circuit units under the control of the DSP microcontroller; the collected output signals of the upper sensing module and the lower sensing module are analyzed and processed by the DSP microcontroller, so that the grain impact signals at the same moment are extracted and counted, and the loss of grains is counted. Compared with the signal conditioning module of the existing grain loss sensor, the grain impact signal recognition method realizes the recognition of the grain impact signal in the background of strong noise interference, and the statistics of the service loss caused in the operation process of the combine harvester is more accurate.
Description
Technical Field
The invention relates to a signal conditioning module of a sensor, in particular to a signal conditioning module of a grain loss sensor.
Background
In order to improve the working quality and the production efficiency of the combine harvester, the harvesting loss of the combine harvester needs to be detected in real time. In recent years, some experts and scholars at home and abroad have conducted a series of researches on grain loss detection devices applied to combine harvesters. Patent CN201611039729.5 provides a double-deck cross structure granule collision sensor based on PVDF, installs this cereal loss detection device in combine, can realize discerning a plurality of kernels of loss under the certain time, has compensatied most only to the defect that single kernel detected in cereal loss detection device's the research.
The operating principle of the double-layer cross-shaped structure particle impact sensor based on PVDF proposed by patent CN201611039729.5 is as follows: when the combine harvester is used for harvesting in the field, cleaning materials thrown out of the separating and cleaning mechanism can impact a sensitive material PVDF piezoelectric film of the grain loss sensor at a certain speed. Due to the piezoelectric effect, the grain loss sensor can output a charge signal in a certain proportion to the impact force of the cleaned material. At present, the existing grain loss sensor only detects impact signals of single grains, a signal conditioning module only identifies and counts the impact signals of the single grains at the same moment, and the impact signals of multiple grains at the same moment cannot be distinguished, so that the detection error of the lost grains is higher. Therefore, it is necessary to design a signal conditioning module matched with the PVDF-based double-layer cross-structure particle impact sensor proposed in patent CN201611039729.5, to extract and count multiple seed impact signals at the same time under the background of strong noise interference, and complete calculation of the loss amount of grains, so as to improve the detection accuracy of the lost grains, and provide a basis for real-time automatic adjustment of the combine harvester.
Disclosure of Invention
The invention aims to provide a signal conditioning module of a grain loss sensor, which conditions a weak charge signal output by a double-layer cross-shaped structure grain collision sensor based on PVDF into a voltage signal suitable for transmission and processing of a post-stage module, and can effectively identify a grain impact signal in a strong noise interference background; the signal synchronous acquisition unit is used for synchronously acquiring the voltage signals output by the conditioned upper sensing layer and the conditioned lower sensing layer; and extracting and counting the multi-seed impact signals at the same moment in a signal processing unit taking a DSP microcontroller as a core, and finishing the counting of the loss amount of the grains.
The technical scheme adopted by the invention for solving the problems is as follows:
the invention comprises a conditioning circuit unit which is mainly formed by sequentially connecting a charge-voltage conversion circuit, an absolute value circuit and a band-pass filter circuit, a multi-channel signal synchronous acquisition unit which is formed by cascading two A/D converters AD7606, and a signal processing unit which takes a DSP microcontroller as a core; the A/D converter adopts a 16-bit and 8-channel synchronous analog-digital data acquisition system AD7606, and the DSP microcontroller adopts a high-precision floating-point controller TMS320F 28335. The upper sensing module and the lower sensing module of the grain loss sensor are connected to the input end of the multi-channel signal synchronous acquisition unit through respective conditioning circuit units, and the multi-channel signal synchronous acquisition unit synchronously acquires output signals of the upper sensing module and the lower sensing module conditioned by the conditioning circuit units under the control of the DSP microcontroller; the collected output signals of the upper sensing module and the lower sensing module are analyzed and processed in the DSP microcontroller by utilizing a grain identification algorithm, so that the grain impact signals at the same moment are extracted and counted, and the grain loss is counted.
The grain loss sensor mainly comprises an upper sensing layer and a lower sensing layer, wherein the upper sensing layer is formed by arranging upper sensing modules, and the lower sensing layer is formed by arranging lower sensing modules.
The conditioning circuit unit conditions a weak charge signal output by the grain loss sensor into a voltage signal suitable for post-processing and transmission, suppresses noise pickup at the input end of the signal conditioning circuit, and extracts a grain impact signal from a strong noise interference background; the signal acquisition unit synchronously acquires output signals of the upper sensing module and the lower sensing module which are conditioned by the conditioning circuit; the signal processing unit taking the DSP microcontroller as a core discriminates and counts signals of the multi-seed impact grain loss sensor at the same moment, so that the detection accuracy of lost grains is improved, and a reliable data source is provided for quantifying grain loss caused in the harvesting process of the combine harvester.
The invention relates to a signal conditioning module designed for a PVDF-based double-layer crisscross particle impact sensor proposed in patent application CN 201611039729.5. In the invention, the grain loss sensor is a particle impact sensor composed of an x-direction sensor layer, an insulating sheet, a y-direction sensor layer and a supporting plate in the patent application CN201611039729.5, the upper and lower sensing layers are the x-direction sensor layer and the y-direction sensor layer, the upper and lower sensing modules are an x-direction sensing unit and a y-direction sensing unit, the upper and lower sensing modules are respectively arranged and combined in parallel to form an upper and lower sensing array, and the upper and lower sensing modules are respectively the x-direction and the y-direction.
Unlike the 5 × 5 array in patent application CN201611039729.5, the present invention is implemented by an 8 × 8 array composed of 8 upper and lower sensing modules.
The DSP microcontroller processes signals in the following modes:
firstly, a sampling and timing sub-process is carried out: synchronously acquiring voltage signals output by the upper sensing module and the lower sensing module of the grain loss sensor after being conditioned by the conditioning circuit unit, and recording the time when the voltage signals are acquired by the A/D converters corresponding to the upper sensing layer and the lower sensing layer by using a timer to obtain the upper layer marking time, the lower layer marking time and the voltage signals corresponding to the upper layer marking time and the lower layer marking time;
then, an impact signal time judging process is carried out: screening, distinguishing and combining voltage signals from the same moment in the upper layer marking moment and the lower layer marking moment;
and finally, performing threshold comparison and lost grain counting processes: comparing the reserved voltage signal at the same moment with a set threshold voltage to identify and extract a seed impact signal and filter a residual material impact signal; the number of the extracted voltage signals at the same moment (namely the number of grains generating impact signals at the same moment) is counted, the number of the lost grains detected at the moment is accumulated in a counter on the basis of the detected grain loss amount, and the interference of impurity materials on the grain impact signals is eliminated.
As shown in fig. 3, the signals collected by the a/D converter are analyzed and processed in the DSP microcontroller, so as to extract and discriminate the multi-seed impact signals at the same time, and complete the counting of the grain loss.
The process of identifying the multi-grain impact signals and counting the loss amount of the grains at the same moment in the DSP microcontroller comprises the following steps:
firstly, executing system initialization action, and carrying out a sampling and timing sub-process:
synchronously acquiring voltage signals U1-U8 output by an upper sensing layer of the grain loss sensor conditioned by the conditioning circuit unit and voltage signals U1-U8 output by a lower sensing layer of the grain loss sensor conditioned by the conditioning circuit unit, and recording the time when the voltage signals are acquired by using a timer through each signal acquisition channel of an A/D converter corresponding to the upper sensing layer and the lower sensing layer to obtain upper layer marking time T1-T8 and voltage signals U1-U8 of each upper sensing module in the upper sensing layer and lower layer marking time T1-T8 and voltage signals U1-U8 below each lower sensing module in the lower sensing layer;
then, an impact signal time judging process is carried out:
A) firstly, the following methods are respectively adopted for the upper sensing layer:
comparing all upper layer marking time T1-T8 of each sensing module in the upper sensing layer in a pairwise manner, reserving equal marking time and voltage signals thereof in all marking time T1-T8 of each sensing module in the upper sensing layer, and forming a group of marking time groups [ Tc, (Ug … Um) ], wherein Tc is equal marking time in all marking time T1-T8 of each sensing module in the upper sensing layer, and (Ug … Um) is all voltage signals at the marking time Tc; discarding the marking time and the voltage signal of each sensing module in the upper sensing layer, which are not equal to other marking times;
B) the set of marker instants retained for the upper sensing layer is processed in the following way:
then comparing the marking time Tc of the marking time group [ Tc, (Ug … Um) ] reserved by the upper sensing layer with the lower layer marking time T1-T8 of each lower sensing module in a pairwise manner to obtain the time difference delta T between the two;
if the time difference Δ T is smaller than the time threshold Δ T, retaining the compared lower layer marking time Te … Tn and the voltage signal Ue … Un thereof (Te … Tn is any time from the lower layer marking times T1 to T8 of each lower sensing module) and forming a group of marking time groups [ Te, Ue ] … [ Tn, Un ], that is, indicating that the marking time Tc of the marking time group [ Tc, (Ug … Um) ] retained by the upper sensing layer and the marking time Te … Tn of the marking time group [ Te, Ue ] … [ Tn, Un ] retained by the lower sensing layer belong to the time of the same seed impact; the voltage signals (Ug … Um) of the mark time group [ Tc, (Ug … Um) ] reserved by the upper sensing layer and the voltage signals Ue … Un of the lower mark time group [ Te, Ue ] … [ Tn, Un ] reserved by the lower sensing layer are seed impact signals at the same time;
if the time difference delta T is larger than or equal to the time threshold delta T, only a single grain impacts the grain loss sensor at the marking time Tc of the marking time group reserved in the upper sensing layer;
C) then, threshold comparison and lost grain counting processes are carried out:
when judging that a plurality of grains impact the grain loss sensor at the same time at the current moment, the processes of comparing the threshold value and counting the lost grains are as follows:
sequentially comparing the voltage signals Ue … Un output by the lower sensing layer corresponding to the seed impact signals at the same time with a preset threshold voltage Uth, respectively, reserving the voltage signals greater than the threshold voltage Uth in the voltage signals Ue … Un, and taking the number I of the reserved voltage signals as the number of seeds generating the seed impact signals at the same time; finally, the number of the seeds obtained by judging the seed impact signals at the same moment is accumulated in a counter to obtain the grain loss T+1T + I, where T is the total amount of grain lost detected at a time before the detection time, T+1The total grain loss detected at the moment of detection.
In the step C), when judging that only a single-grain impact grain loss sensor is in the current time, the processes of comparing the threshold value and counting the loss grains are as follows:
comparing a voltage signal Uc of a mark time group [ Tc, Uc ] reserved by the upper sensing layer with a preset threshold voltage Uth, wherein Tc is any mark time in all mark times T1-T8 of each sensing module in the upper sensing layer, and Uc is a voltage signal under the mark time Tc;
if Uc is larger than Uth, keeping Uc, and keeping the number I of the kept voltages as 1, namely the number of grains generating grain impact signals at the moment is 1, and accumulating to the grain loss T+1＝T+1；
If the Uc is less than the Uth, abandoning the Uc, and recording the number I of the reserved voltage as 0, namely the number of the seeds generating the seed impact signal at the moment is 0, and not accumulating the loss T of the grains+1T. Wherein T is detected at a time before the detection timeTotal grain loss of T+1The total grain loss detected at the present detection time is used as the total grain loss.
According to the characteristic that the PVDF-based double-layer cross-shaped structure particle collision sensor outputs signals after being impacted by cleaning materials, a conditioning circuit unit which is composed of a charge-voltage conversion circuit, an absolute value circuit and a band-pass filter circuit which are sequentially connected in series is designed, a multi-channel signal synchronous acquisition unit which is composed of two pieces of A/D converters AD7606 in a cascade connection mode and a signal processing unit which takes a DSP microcontroller TMS320F28335 as a core are designed, and a power supply circuit provides power supplies for the units at all levels.
The invention has the beneficial effects that:
compared with the prior art, the method and the device realize the conversion from a weak charge signal to a voltage signal, can identify the seed impact signal in a strong noise interference background, and realize the synchronous acquisition of the voltage signals output by the upper sensing layer and the lower sensing layer conditioned by the conditioning circuit unit. And the number of the seed impact signals at the same time is judged and counted by using a seed recognition algorithm in the DSP microcontroller, and the loss amount of the grains is counted. The signal conditioning module of the grain loss sensor with good noise-resistant robustness and high detection accuracy is designed and realized.
Drawings
FIG. 1 is a schematic diagram of a signal conditioning module according to the present invention;
FIG. 2 is a flow chart of the present invention for data processing in a DSP microcontroller based signal processing unit;
FIG. 3 is a flow chart of the present invention for distinguishing the impact signals of multiple seeds and counting the loss of grains at the same time in a signal processing unit with a DSP microcontroller as a core.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Unlike the 5 × 5 array in patent application CN201611039729.5, the present invention is implemented by an 8 × 8 array composed of 8 upper and lower sensing modules.
As shown in fig. 1, the output ends of each of the upper and lower sensing modules of the grain loss sensor with a double-layer crisscross structure are respectively connected to a conditioning circuit unit composed of a charge-voltage conversion circuit, an absolute value circuit and a band-pass filter circuit which are sequentially connected in series; the output of each upper and lower regulating circuit unit is respectively connected to the input end of a multi-channel signal synchronous acquisition unit formed by two cascaded A/D converters; a multi-channel signal synchronous acquisition unit formed by cascading two A/D converters is used for synchronously acquiring the output signals of the conditioned upper and lower sensing modules under the control of the DSP microcontroller; analyzing and processing the acquired output signals of the upper sensing module and the lower sensing module in the DSP microcontroller by utilizing a grain identification algorithm, finishing the extraction and statistics of grain impact signals at the same moment, and counting the loss amount of grains; the power supply circuit supplies power to the signal conditioning module designed by the invention.
In specific implementation, the conditioning circuit unit adopts a signal conditioning unit in the technical scheme of chinese patent application having application number 2018103593670 and application date 2018.4.20, that is: the charge-voltage conversion circuit adopts a charge-voltage conversion circuit in the technical scheme of Chinese patent application with the application number of 2018103593670 and the application date of 2018.4.20, the absolute value circuit adopts an absolute value circuit in the technical scheme of Chinese patent application with the application number of 2018103593670 and the application date of 2018.4.20, and the band-pass filter circuit adopts a band-pass filter circuit in the technical scheme of Chinese patent application with the application number of 2018103593670 and the application date of 2018.4.20; the multichannel signal synchronous acquisition unit and the DSP microcontroller adopt a multichannel signal synchronous acquisition unit in the technical scheme of Chinese patent application with the application number of 2018103593670 and the application date of 2018.4.20 and a control unit taking the DSP microcontroller as a core.
In specific implementation, both the two A/D converters adopt a 16-bit and 8-channel synchronous analog-digital data acquisition system AD 7606; the DSP microcontroller adopts a high-precision floating-point controller TMS320F 28335.
As shown in fig. 2, the process of performing data processing on the signals acquired by the multi-channel signal synchronous acquisition unit at the DSP microcontroller is as follows:
firstly, synchronously acquiring voltage signals output by upper and lower sensing modules of the grain loss sensor after being conditioned by a conditioning circuit unit in a sampling and timing sub-process, and recording the time when the voltage signals are acquired by each signal acquisition channel of an A/D converter corresponding to an upper sensing layer and a lower sensing layer by using a timer to obtain the upper layer marking time, the lower layer marking time and the voltage signals below the upper layer marking time and the lower layer marking time;
then, carrying out an impact signal time judgment sub-process: screening, distinguishing and combining voltage signals from the same moment in the upper layer marking moment and the lower layer marking moment;
and finally, carrying out a threshold comparison and lost grain counting sub-process: comparing the reserved voltage signal at the same moment with a set threshold voltage so as to accurately identify and extract a seed impact signal and filter an impurity material impact signal; and counting the number of the extracted voltage signals at the same moment (namely the number of grains generating impact signals at the same moment), and accumulating the number of the lost grains detected at the moment in a counter.
As shown in fig. 3, the process of performing the identification of the multi-kernel impact signal and the grain loss amount counting at the same time in the DSP microcontroller is as follows:
firstly, executing system initialization action, and carrying out a sampling and timing sub-process:
synchronously acquiring voltage signals U1-U8 output by an upper sensing layer of the grain loss sensor conditioned by the conditioning circuit unit and voltage signals U1-U8 output by a lower sensing layer of the grain loss sensor conditioned by the conditioning circuit unit, and recording the time when the voltage signals are acquired by using a timer through each signal acquisition channel of an A/D converter corresponding to the upper sensing layer and the lower sensing layer to obtain upper layer marking time T1-T8 and voltage signals U1-U8 of each upper sensing module in the upper sensing layer and lower layer marking time T1-T8 and voltage signals U1-U8 below each lower sensing module in the lower sensing layer;
then, an impact signal time judging process is carried out:
A) the following processing is respectively adopted for the upper sensing layer and the lower sensing layer:
comparing all marking time T1-T8 of each sensing module in the upper sensing layer in a pairwise manner, reserving equal marking time and voltage signals below the equal marking time in all marking time T1-T8 of each sensing module in the upper sensing layer, and forming a group of marking time groups [ Tc, (Ug … Um) ], wherein Tc is equal marking time in all marking time T1-T8 of each sensing module in the upper sensing layer, and (Ug … Um) is all voltage signals at the marking time Tc; the voltage signals at and below the time not equal to the other mark times in all the mark times T1-T8 of each sensing module in the upper sensing layer are discarded,
B) then comparing the marking time Tc of the marking time group [ Tc, (Ug … Um) ] reserved by the upper sensing layer with the lower layer marking time T1-T8 of each lower sensing module in a pairwise manner to obtain the time difference delta T between the two;
if the time difference Δ T is less than the time threshold Δ T, keeping the compared lower layer mark time Te … Tn and the voltage signal Ue … Un therebelow (Te … Tn is a certain time from the lower layer mark times T1 to T8 of each lower sensing module) and forming a mark time group [ Te, Ue ] … [ Tn, Un ], namely, the mark time Tc of the mark time group [ Tc, (Ug … Um) ] kept by the upper sensing layer and the mark time Te … Tn of the mark time group [ Te, Ue ] … [ Tn, Un ] kept by the lower sensing layer belong to the same time of the kernel impact, and the voltage signal (Ug … Um) of the mark time group [ Tc, (Ug … Um) ] kept by the upper sensing layer and the voltage signal Ue … Un of the lower layer mark time group [ Te, Ue ] … [ Tn, Un ] kept by the lower sensing layer are the impact signals at the same time;
otherwise, it is considered that only a single grain impacts the grain loss sensor at the marking time Tc of the set of marking times retained by the upper sensing layer.
Then, threshold comparison and lost grain counting processes are carried out:
when judging that a plurality of grains impact the grain loss sensor at the same time at the current moment, the process of comparing the threshold value and counting the lost grains is as follows:
sequentially comparing the reserved voltage signals Ue … Un output by the lower sensing layer at the same time with a preset threshold voltage Uth, respectively, reserving the voltage signals which are greater than the threshold voltage Uth in the voltage signals Ue … Un, and counting the number I of the reserved voltage signals, wherein I is the number of seeds generating seed impact signals at the same time; finally, the number of the seeds obtained by judging the seed impact signals at the same moment is accumulated in a counter to obtain the grain loss T+1T + I, where T is the total amount of grain lost detected at a time before the detection time, T+1The total amount of grain lost detected at this detection time.
When judging that only a single-grain impact grain loss sensor is in the current time, the processes of comparing the threshold value and counting the loss grains are as follows:
set of marked times [ Tc, Uc ] retained by the upper sensing layer]Comparing the preset threshold voltage Uth of the voltage signal Uc, wherein Tc is any marking time from all marking times T1 to T8 of each sensing module in the upper sensing layer, and Uc is a voltage signal at the marking time Tc; if Uc is larger than Uth, keeping Uc, and recording the number I of the kept voltages as 1, namely the number of grains generating grain impact signals at the moment is 1, and the grain loss T+1T + 1; if the Uc is less than the Uth, abandoning the Uc, and recording the number I of the reserved voltage as 0, namely the number of the seeds generating the seed impact signal at the moment is 0, and the loss T of the grains+1T. Wherein T is the number of grain losses detected at a time before the detection time, T+1The loss number of grains detected at the detection moment.
Claims (5)
1. A signal conditioning module of a grain loss sensor, characterized by: the device comprises a conditioning circuit unit, a multi-channel signal synchronous acquisition unit and a signal processing unit, wherein the conditioning circuit unit is mainly formed by sequentially connecting a charge-voltage conversion circuit, an absolute value circuit and a band-pass filter circuit in sequence, the multi-channel signal synchronous acquisition unit is formed by cascading two A/D converters AD7606, and the signal processing unit takes a DSP microcontroller as a core; the upper sensing module and the lower sensing module of the grain loss sensor are connected to the input end of the multi-channel signal synchronous acquisition unit through respective conditioning circuit units, and the multi-channel signal synchronous acquisition unit synchronously acquires output signals of the upper sensing module and the lower sensing module conditioned by the conditioning circuit units under the control of the DSP microcontroller; analyzing and processing the acquired output signals of the upper sensing module and the lower sensing module in a DSP (digital signal processor) microcontroller, finishing the extraction and statistics of seed impact signals at the same moment, and counting the loss amount of grains;
the DSP microcontroller processes signals in the following modes:
firstly, a sampling and timing sub-process is carried out: synchronously acquiring voltage signals output by the upper sensing module and the lower sensing module of the grain loss sensor, and recording the time when the voltage signals are acquired by the A/D converters corresponding to the upper sensing layer and the lower sensing layer by using a timer to obtain the marking time of the upper layer, the marking time of the lower layer and the voltage signals corresponding to the marking time of the upper layer and the marking time of the lower layer;
then, an impact signal time judging process is carried out: screening, distinguishing and combining voltage signals from the same moment in the upper layer marking moment and the lower layer marking moment;
and finally, performing threshold comparison and lost grain counting processes: comparing the reserved voltage signal at the same moment with a set threshold voltage to identify and extract a seed impact signal and filter a residual material impact signal; and counting the number of the extracted voltage signals at the same moment, and accumulating the number of the lost grains detected at the moment on the basis of the detected grain loss in a counter.
2. The signal conditioning module of a grain loss sensor of claim 1, wherein: the A/D converter adopts a 16-bit and 8-channel synchronous analog-digital data acquisition system AD7606, and the DSP microcontroller adopts a high-precision floating-point controller TMS320F 28335.
3. The signal conditioning module of a grain loss sensor of claim 1, wherein: signals collected by the A/D converter are analyzed and processed in the DSP microcontroller, extraction and discrimination of multi-seed impact signals at the same moment are realized, and the grain loss amount is counted.
4. The signal conditioning module of a grain loss sensor of claim 1, wherein: the process of identifying the multi-grain impact signals and counting the loss amount of the grains at the same moment in the DSP microcontroller comprises the following steps:
firstly, executing system initialization action, and carrying out a sampling and timing sub-process: synchronously acquiring voltage signals U1-U8 output by an upper sensing layer of the grain loss sensor conditioned by the conditioning circuit unit and voltage signals U1-U8 output by a lower sensing layer of the grain loss sensor conditioned by the conditioning circuit unit, and recording the time when the voltage signals are acquired by using a timer through each signal acquisition channel of an A/D converter corresponding to the upper sensing layer and the lower sensing layer to obtain upper layer marking time T1-T8 and voltage signals U1-U8 of each upper sensing module in the upper sensing layer and lower layer marking time T1-T8 and voltage signals U1-U8 below each lower sensing module in the lower sensing layer;
then, an impact signal time judging process is carried out:
A) firstly, the following methods are respectively adopted for the upper sensing layer:
comparing all upper layer marking time T1-T8 of each sensing module in the upper sensing layer in a pairwise manner, reserving equal marking time and voltage signals thereof in all marking time T1-T8 of each sensing module in the upper sensing layer, and forming a group of marking time groups [ Tc, (Ug … Um) ], wherein Tc is equal marking time in all marking time T1-T8 of each sensing module in the upper sensing layer, and (Ug … Um) is all voltage signals at the marking time Tc; discarding the marking time and the voltage signal of each sensing module in the upper sensing layer, which are not equal to other marking times;
B) the set of marker instants retained for the upper sensing layer is processed in the following way:
then comparing the marking time Tc of the marking time group [ Tc, (Ug … Um) ] reserved by the upper sensing layer with the lower layer marking time T1-T8 of each lower sensing module in a pairwise manner to obtain the time difference delta T between the two;
if the time difference Δ T is smaller than the time threshold Δ T, retaining the compared lower layer marking time Te … Tn and the voltage signal Ue … Un thereof (Te … Tn is any time from the lower layer marking times T1 to T8 of each lower sensing module) and forming a group of marking time groups [ Te, Ue ] … [ Tn, Un ], that is, indicating that the marking time Tc of the marking time group [ Tc, (Ug … Um) ] retained by the upper sensing layer and the marking time Te … Tn of the marking time group [ Te, Ue ] … [ Tn, Un ] retained by the lower sensing layer belong to the time of the same seed impact; the voltage signals (Ug … Um) of the mark time group [ Tc, (Ug … Um) ] reserved by the upper sensing layer and the voltage signals Ue … Un of the lower mark time group [ Te, Ue ] … [ Tn, Un ] reserved by the lower sensing layer are seed impact signals at the same time;
if the time difference delta T is larger than or equal to the time threshold delta T, only a single grain impacts the grain loss sensor at the marking time Tc of the marking time group reserved in the upper sensing layer;
C) then, threshold comparison and lost grain counting processes are carried out:
when judging that a plurality of grains impact the grain loss sensor at the same time at the current moment, the processes of comparing the threshold value and counting the lost grains are as follows:
sequentially comparing the voltage signals Ue … Un output by the lower sensing layer corresponding to the seed impact signals at the same time with a preset threshold voltage Uth, respectively, reserving the voltage signals greater than the threshold voltage Uth in the voltage signals Ue … Un, and taking the number I of the reserved voltage signals as the number of seeds generating the seed impact signals at the same time; finally, the number of the seeds obtained by judging the seed impact signals at the same moment is accumulated in a counter to obtain the grain loss T+1T + I, where T is the total amount of grain lost detected at a time prior to the present detection time, T+1The total grain loss detected at the moment of detection.
5. The method of claim 4The signal conditioning module of the grain loss sensor is characterized in that: in the step C), when judging that only a single-grain impact grain loss sensor is in the current time, the processes of comparing the threshold value and counting the loss grains are as follows: set of marked times [ Tc, Uc ] retained by the upper sensing layer]Comparing the voltage signal Uc with a preset threshold voltage Uth, where Tc is any one of all the mark times T1-T8 of each sensing module in the upper sensing layer, and Uc is a voltage signal at the mark time Tc; if the Uc is larger than the Uth, keeping the Uc, recording the number I of the kept voltages as 1, namely the number of the seeds generating the seed impact signals at the current moment as 1, and accumulating to the grain loss T+1＝T+1；
If the Uc is less than the Uth, abandoning the Uc, and recording the number I of the reserved voltage as 0, namely the number of the seeds generating the seed impact signal at the moment is 0, and not accumulating the loss T of the grains+1T, where T is the total amount of grain lost detected at a time before the current detection time, T+1The total loss of the grains detected at the current detection time is used as the total loss of the grains.
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