阅读说明：本技术 自动增益控制的矿井通风方法、装置及系统 (Automatic gain control mine ventilation method, device and system ) 是由 乔力帆 徐浩 高健勋 高利晶 马新根 张倍宁 刘杰 王耀辉 伏明 郝强 栗磊 于 2021-06-11 设计创作，主要内容包括：本发明提供一种自动增益控制的矿井通风方法、装置及系统,该方法包括：获取预设时段内多个有害气体浓度值；根据多个有害气体浓度值的峰值及中值确定数据强度；若数据强度大于有害气体安全阈值,则根据有害气体安全阈值及数据强度计算调整系数；若调整系数大于或等于一,则根据调整系数及当前放大倍数确定目标放大倍数；根据目标放大倍数及自动增益策略确定自动增益控制值,以及根据自动增益控制值控制风机。本发明可以合理控制风机风量大小,通过自动增益控制避免风机风量忽大忽小,维持风机运行的稳定性。(The invention provides a method, a device and a system for mine ventilation with automatic gain control, wherein the method comprises the following steps: acquiring a plurality of harmful gas concentration values in a preset time period; determining data intensity according to peak values and median values of a plurality of harmful gas concentration values; if the data intensity is greater than the harmful gas safety threshold, calculating an adjustment coefficient according to the harmful gas safety threshold and the data intensity; if the adjusting coefficient is greater than or equal to one, determining a target magnification according to the adjusting coefficient and the current magnification; and determining an automatic gain control value according to the target amplification factor and the automatic gain strategy, and controlling the fan according to the automatic gain control value. The invention can reasonably control the air quantity of the fan, avoid the air quantity of the fan from being suddenly changed by automatic gain control and maintain the stability of the operation of the fan.)

1. A method of automatic gain controlled mine ventilation, the method comprising:

acquiring a plurality of harmful gas concentration values in a preset time period;

determining data intensity according to the peak value and the median value of the concentration values of the harmful gases;

if the data intensity is greater than the harmful gas safety threshold, calculating an adjustment coefficient according to the harmful gas safety threshold and the data intensity;

if the adjusting coefficient is larger than or equal to one, determining a target magnification according to the adjusting coefficient and the current magnification;

and determining an automatic gain control value according to the target amplification factor and an automatic gain strategy, and controlling the fan according to the automatic gain control value.

2. The method of claim 1, wherein determining an automatic gain control value according to the target amplification factor and an automatic gain strategy comprises:

if the target amplification factor is smaller than a first threshold value, determining that an automatic gain control value is zero;

if the target amplification factor is greater than or equal to the first threshold and less than a second threshold, determining an automatic gain control value according to a first factor-control value fitting curve;

if the target amplification factor is greater than or equal to the second threshold and less than a third threshold, determining an automatic gain control value according to a second multiplier-control value fitting curve; the slope of the second multiple-control value fitting curve is less than the slope of the first multiple-control value fitting curve;

and if the target amplification factor is greater than or equal to the third threshold, determining the automatic gain control value as the maximum control value.

3. The method of claim 1, wherein the preset time period is divided into a plurality of consecutive sub-periods; determining data intensity according to the peak value and the median value of the concentration values of the harmful gases, wherein the determining comprises the following steps:

determining a harmful gas concentration peak value corresponding to the harmful gas concentration value in each sub-period;

and calculating the median of each harmful gas concentration peak value to obtain the data intensity.

4. The method of claim 1, wherein said calculating an adjustment factor based on said hazardous gas safety threshold and said data intensity comprises:

and calculating the ratio of the data intensity to the harmful gas safety threshold value to obtain an adjustment coefficient.

5. The method of claim 1, wherein determining a target magnification factor based on the adjustment factor and a current automatic magnification factor comprises:

and multiplying the current amplification factor by the adjusting coefficient to obtain the target amplification factor.

6. The method of claim 1, further comprising:

if the adjusting coefficient is smaller than one, multiplying the current amplification factor by a preset value to obtain a target amplification factor; the preset value is less than one.

7. The method of claim 6, wherein prior to said controlling the fan according to the automatic gain control value, the method further comprises:

and starting a timer to execute a plurality of cycles, and executing the step of controlling the fan according to the automatic gain control value after interruption.

8. An automatic gain controlled mine ventilation device, the device comprising:

the concentration acquisition module is used for acquiring a plurality of harmful gas concentration values in a preset time period;

the data intensity calculation module is used for determining the data intensity according to the peak value and the median value of the concentration values of the harmful gases;

the adjustment coefficient calculation module is used for calculating an adjustment coefficient according to the harmful gas safety threshold and the data intensity if the data intensity is greater than the harmful gas safety threshold;

the amplification factor determining module is used for determining a target amplification factor according to the adjustment factor and the current amplification factor if the adjustment factor is greater than or equal to one;

and the automatic gain control module is used for determining an automatic gain control value according to the target amplification factor and an automatic gain strategy and controlling the fan according to the automatic gain control value.

9. The apparatus of claim 8, wherein the automatic gain control module is specifically configured to:

if the target amplification factor is smaller than a first threshold value, determining that an automatic gain control value is zero;

if the target amplification factor is greater than or equal to the first threshold and less than a second threshold, determining an automatic gain control value according to a first factor-control value fitting curve;

if the target amplification factor is greater than or equal to the second threshold and less than a third threshold, determining an automatic gain control value according to a second multiplier-control value fitting curve; the slope of the second multiple-control value fitting curve is less than the slope of the first multiple-control value fitting curve;

and if the target amplification factor is greater than or equal to the third threshold, determining the automatic gain control value as the maximum control value.

10. An automatic gain controlled mine ventilation system comprising a controller for performing the automatic gain controlled mine ventilation method of any one of claims 1 to 7.

Technical Field

The invention relates to the technical field of mine ventilation, in particular to a mine ventilation method, a mine ventilation device and a mine ventilation system with automatic gain control.

Background

The existing mine intelligent ventilation system is generally provided with a controllable fan, external fresh air can enter each branch air channel through a main air inlet channel, each branch air channel is provided with a controllable air window, and a mine roadway is provided with a harmful gas sensor and an air speed sensor.

The opening and closing degree of the air window in the mine and the running parameters of the fan are automatically adjusted by monitoring harmful gas and wind speed information in real time so as to meet the requirement of automatically adjusting the ventilation volume in the mine according to the requirement. Specifically, the air exhaust volume of the controllable fan is adjusted by judging the relationship between the concentration of the harmful gas and the concentration threshold value and the relationship between the air speed and the air speed threshold value, so that disaster accidents caused by various abnormal ventilation can be prevented and treated.

The existing mine ventilation scheme only uses a single threshold value as a criterion to roughly adjust the air quantity of a small fan, the control process of the fan is directly influenced by data collected by a sensor, and the exhaust air quantity of the fan is easy to change rapidly.

Disclosure of Invention

The invention solves the problem that the control process of the fan in the existing mine ventilation scheme is directly influenced by data collected by a sensor, so that the exhaust volume of the fan is easy to change rapidly.

In order to solve the above problems, the present invention provides an automatic gain control method for mine ventilation, the method comprising: acquiring a plurality of harmful gas concentration values in a preset time period; determining data intensity according to the peak value and the median value of the concentration values of the harmful gases; if the data intensity is greater than the harmful gas safety threshold, calculating an adjustment coefficient according to the harmful gas safety threshold and the data intensity; if the adjusting coefficient is larger than or equal to one, determining a target magnification according to the adjusting coefficient and the current magnification; and determining an automatic gain control value according to the target amplification factor and an automatic gain strategy, and controlling the fan according to the automatic gain control value.

Optionally, the determining an automatic gain control value according to the target amplification factor and the automatic gain policy includes: if the target amplification factor is smaller than a first threshold value, determining that an automatic gain control value is zero; if the target amplification factor is greater than or equal to the first threshold and less than a second threshold, determining an automatic gain control value according to a first factor-control value fitting curve; if the target amplification factor is greater than or equal to the second threshold and less than a third threshold, determining an automatic gain control value according to a second multiplier-control value fitting curve; the slope of the second multiple-control value fitting curve is less than the slope of the first multiple-control value fitting curve; and if the target amplification factor is greater than or equal to the third threshold, determining the automatic gain control value as the maximum control value.

Optionally, the preset time period is divided into a plurality of consecutive sub-periods; determining data intensity according to the peak value and the median value of the concentration values of the harmful gases, wherein the determining comprises the following steps: determining a harmful gas concentration peak value corresponding to the harmful gas concentration value in each sub-period; and calculating the median of each harmful gas concentration peak value to obtain the data intensity.

Optionally, the calculating an adjustment coefficient according to the harmful gas safety threshold and the data intensity includes: and calculating the ratio of the data intensity to the harmful gas safety threshold value to obtain an adjustment coefficient.

Optionally, the determining a target magnification according to the adjustment coefficient and the current automatic magnification includes: and multiplying the current amplification factor by the adjusting coefficient to obtain the target amplification factor.

Optionally, the method further comprises: if the adjusting coefficient is smaller than one, multiplying the current amplification factor by a preset value to obtain a target amplification factor; the preset value is less than one.

Optionally, before the controlling the fan according to the automatic gain control value, the method further includes: and starting a timer to execute a plurality of cycles, and executing the step of controlling the fan according to the automatic gain control value after interruption.

The invention provides an automatic gain control mine ventilation device, which comprises: the concentration acquisition module is used for acquiring a plurality of harmful gas concentration values in a preset time period; the data intensity calculation module is used for determining the data intensity according to the peak value and the median value of the concentration values of the harmful gases; the adjustment coefficient calculation module is used for calculating an adjustment coefficient according to the harmful gas safety threshold and the data intensity if the data intensity is greater than the harmful gas safety threshold; the amplification factor determining module is used for determining a target amplification factor according to the adjustment factor and the current amplification factor if the adjustment factor is greater than or equal to one; and the automatic gain control module is used for determining an automatic gain control value according to the target amplification factor and an automatic gain strategy and controlling the fan according to the automatic gain control value.

Optionally, the automatic gain control module is specifically configured to: if the target amplification factor is smaller than a first threshold value, determining that an automatic gain control value is zero; if the target amplification factor is greater than or equal to the first threshold and less than a second threshold, determining an automatic gain control value according to a first factor-control value fitting curve; if the target amplification factor is greater than or equal to the second threshold and less than a third threshold, determining an automatic gain control value according to a second multiplier-control value fitting curve; the slope of the second multiple-control value fitting curve is less than the slope of the first multiple-control value fitting curve; and if the target amplification factor is greater than or equal to the third threshold, determining the automatic gain control value as the maximum control value.

The invention provides an automatic gain control mine ventilation system which comprises a controller, wherein the controller is used for executing the automatic gain control mine ventilation method.

According to the automatic gain control mine ventilation method, device and system provided by the embodiment of the invention, the adjustment coefficient can be determined according to the data intensity of the concentration value of the harmful gas, then the target amplification coefficient is determined according to the adjustment coefficient, the target amplification coefficient corresponds to the control value of the fan based on the automatic gain strategy, the air volume of the fan can be reasonably controlled, the air volume of the fan is prevented from being overlooked through automatic gain control, and the running stability of the fan is maintained.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is a schematic flow chart of an automatic gain control mine ventilation method according to an embodiment of the present invention;

fig. 2 is a schematic diagram of a relationship curve between an agc amplification factor and an agc value according to an embodiment of the present invention;

FIG. 3 is a schematic flow chart of another automatic gain control method for mine ventilation according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of an automatic gain control mine ventilation device according to an embodiment of the present invention.

Description of reference numerals:

401-concentration acquisition module; 402-a data intensity calculation module; 403-adjustment coefficient calculation module; 404-magnification determination module; 405-automatic gain control module.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The automatic gain control mine ventilation system provided by the embodiment can detect each index parameter in the mine in real time through the harmful gas sensor, the wind speed sensor and the temperature sensor, and the system analyzes the parameters in a period of time through the collected index parameters to control the operation of the fan so as to achieve the aim of dynamically adjusting the ventilation in real time.

In the prior art, the air volume is roughly adjusted according to a single threshold value, so that the setting of the threshold value is crucial, and if the threshold value is set to be smaller in practical use, the fan is in a full-load state for a long time; if the threshold value is set to be larger, the safety of the underground operation environment cannot be guaranteed. The automatic gain control mine ventilation method provided by the embodiment of the invention can embody the control process of the fan based on automatic gain amplification and can carry out feedback dynamic control according to the data collected by the sensor.

Fig. 1 is a schematic flow chart of an automatic gain control mine ventilation method according to an embodiment of the present invention, which includes the following steps:

s102, obtaining a plurality of harmful gas concentration values in a preset time period.

And (4) transmitting the measurement data of the harmful gas sensor back to the system, and optionally, collecting a plurality of continuous harmful gas concentration values in a preset time period according to a preset sampling rate. For example, the concentration values of the harmful gas are continuously obtained in a period of 1 second for 1 minute, and 60 concentration values of the harmful gas are obtained.

And S104, determining the data intensity according to the peak value and the median value of the concentration values of the harmful gases.

Wherein, the peak values of the plurality of harmful gas concentration values can be extracted in a segmented manner. After the concentration value of the harmful gas is obtained, in order to avoid data errors caused by faults of individual sensors, data in a certain time can be integrally processed, and the condition that the air quantity of a fan is suddenly reduced due to fluctuation of a small amount of data is prevented. Optionally, dividing the preset time period into a plurality of continuous sub-time periods, and then determining a harmful gas concentration peak value corresponding to the harmful gas concentration value in each sub-time period; the median of each harmful gas concentration peak is calculated and is used as the data intensity of the harmful gas concentration value.

By acquiring the peak value of each sub-period, the air quantity of the fan can be controlled by the maximum value of each sub-period under the condition of fluctuation of the concentration of harmful gas, so that the safety of the mine working environment is improved; then, the median of all peak values is extracted, so that the air volume of the fan can be effectively adjusted as fast as possible, the air volume of the fan cannot be controlled to be too sensitive, and the running stability of the fan is maintained.

Furthermore, by the operation of calculating the peak value and the median value, false alarm and blind increase of the air volume of the fan caused by sensor failure or other reasons can be avoided.

And S106, if the data intensity is greater than the harmful gas safety threshold, calculating an adjustment coefficient according to the harmful gas safety threshold and the data intensity.

If the data intensity is greater than the harmful gas safety threshold, the current harmful gas concentration is beyond the safety range, and the air quantity of the fan needs to be increased and adjusted; and if the data intensity is less than or equal to the harmful gas safety threshold, returning to the step of executing the collection of the harmful gas concentration value.

And when the current harmful gas concentration exceeds the safe range, calculating an adjusting coefficient based on the safe threshold value of the harmful gas and the data intensity. Alternatively, the adjustment factor may be obtained by calculating a ratio of the data intensity to the harmful gas safety threshold. It should be noted that, in this embodiment, a proportional relationship between the data intensity and the harmful gas safety threshold is used as an adjustment coefficient, and in a subsequent step, the amplification coefficient of the automatic gain control is adjusted based on the adjustment coefficient, so that the influence of the current harmful gas concentration on the automatic gain control can be visually reflected, and the accuracy of the fan air volume control is improved.

And S108, if the adjusting coefficient is larger than or equal to one, determining a target magnification according to the adjusting coefficient and the current magnification.

Specifically, the target magnification is obtained by multiplying the current magnification by the adjustment coefficient.

If the adjusting coefficient is less than one, the current harmful gas concentration is in a safe range, and the air volume of the fan can be controlled to be reduced in order to reduce the load of the fan and save power. Based on this, the current magnification may be multiplied by a preset value, which is less than one, to obtain the target magnification.

And S110, determining an automatic gain control value according to the target amplification factor and the automatic gain strategy, and controlling the fan according to the automatic gain control value.

And mapping the target amplification factor and the automatic gain control value into a fitting function by adopting an automatic gain strategy, wherein the automatic gain control value is rapidly increased along with the increase of the target amplification factor when the target amplification factor is small, and the automatic gain control value is slowly increased along with the increase of the target amplification factor when the target amplification factor is large, so that the air quantity of the fan is finely controlled.

Optionally, determining the automatic gain control value comprises:

if the target amplification factor is smaller than a first threshold value, determining that the automatic gain control value is zero;

if the target amplification factor is greater than or equal to the first threshold and less than the second threshold, determining an automatic gain control value according to a first factor-control value fitting curve;

if the target amplification factor is greater than or equal to the second threshold and less than a third threshold, determining an automatic gain control value according to a second multiplier-control value fitting curve; the slope of the second multiple-control value fitting curve is smaller than that of the first multiple-control value fitting curve;

and if the target amplification factor is greater than or equal to the third threshold, determining the automatic gain control value as the maximum control value.

Illustratively, the first threshold is 1, the second threshold is 5, and the third threshold is 50.

Fig. 2 is a diagram showing a relationship between an automatic gain control amplification factor and an automatic gain control value, showing a first factor-control value fitting curve a and a second factor-control value fitting curve B, with the amplification factor on the horizontal axis and the control value on the vertical axis.

The target amplification factor is between the first threshold and the second threshold, and the target amplification factor can be substituted into the curve A to obtain a corresponding control value; the target magnification is between the second threshold and the third threshold, and the target magnification may be substituted into the curve B to obtain the corresponding control value. As shown in fig. 2, the curve a is a steep curve, the curve B is a gentle curve, the control value is changed greatly when the target amplification factor is changed a little within the range of the curve a, the air volume of the fan can be increased rapidly when the concentration of the harmful gas is increased within a short time, the treatment is more careful at the stage of the target amplification factor being small, and the purpose of maintaining the safety of the mine working environment can be achieved.

Optionally, a timer may be started to execute a plurality of cycles, and the step of controlling the fan according to the agc value may be executed after the interruption, so as to avoid an excessively frequent control frequency and an excessively excessive control degree.

According to the automatic gain control mine ventilation method provided by the embodiment, the adjustment coefficient can be determined according to the data intensity of the concentration value of the harmful gas, then the target amplification coefficient is determined according to the adjustment coefficient, the target amplification coefficient corresponds to the control value of the fan based on the automatic gain strategy, the air volume of the fan can be reasonably controlled, the air volume of the fan is prevented from being suddenly changed through automatic gain control, and the running stability of the fan is maintained.

Fig. 3 is a schematic flow chart of another automatic gain control mine ventilation method according to an embodiment of the present invention, in which a relationship between automatic gain factors and control values is mapped as a function, optionally, the control values are hexadecimal numbers, each automatic gain factor corresponds to a control value, initially, when the change of the automatic gain factors is small, the control value changes greatly, and when the concentration of harmful gas increases in a short time, the controllable fan is rapidly increased, so that the harmful gas is prevented from being "carefully bred", and the mine ventilation method is more carefully processed in a stage with a small amplification factor, thereby achieving the purpose of maintaining the safety of the mine working environment. The method comprises the following steps:

and S301, starting and initializing the fan.

And S302, measuring and returning harmful gas concentration data by the sensor.

And S303, judging whether the quantity of the harmful gas concentration data is greater than a threshold value Q. If yes, go to S304; if not, the process continues to step S302.

The sensor can collect the concentration value of the harmful gas and the wind speed value within 1 minute according to the sampling rate to obtain a plurality of harmful gas concentration data. After a sufficient amount of data has been acquired, the subsequent automatic gain control steps can be performed.

And S304, generating serial port interrupt to perform data processing.

And S305, calculating a peak value every N data in the Q harmful gas concentration data.

Taking the data in 1 minute as an example, the peak value can be calculated every 20 s.

And S306, calculating the data intensity I according to each peak value.

Optionally, the median of each peak is taken as the data intensity I.

And S307, judging whether the data intensity I is within the harmful gas safety threshold value K. If yes, returning to execute S302; if not, go to S308.

And S308, calculating an adjusting coefficient M according to the data intensity I. Optionally, M ═ I/K.

S309, judging whether the adjusting coefficient M is smaller than 1. If yes, go to S318; if not, go to S310.

S310, calculate the target magnification CM ═ PM × M. Wherein, PM is the current magnification, i.e. the current magnification is determined based on the last magnification.

S311, judging whether CM is less than 1. If yes, go to S312; if not, S313 is executed.

S312, the control value is determined to be 0.

S313, judge whether CM is greater than or equal to 1 and less than 5. If yes, go to S314; if not, go to S315.

And S314, substituting CM into the curve A to obtain a control value W.

S315, judging whether CM is more than or equal to 5 and less than 50. If yes, go to S316; if not, S317 is executed.

And S316, substituting CM into the curve B to obtain a control value W.

And S317, determining the control value as the maximum control value.

If the target amplification factor is less than 1, continuing to judge the collected data forward according to the set step length; if the current amplification factor is greater than 1, judging whether the amplification factor is greater than or equal to 1 and less than 5, if so, bringing the current amplification factor into a fitting curve A to obtain a corresponding control value for controlling the degree of the fan, if not, continuously judging whether the amplification factor is greater than or equal to 5 and less than 50, if so, bringing the current amplification factor into a fitting curve B to obtain a corresponding control value for controlling the fan; if not, the control value is adjusted to be maximum.

S318, start timer 1, cycle 3 times, interrupt every 0.5 seconds.

S319, calculates the target magnification CM × 0.7. If the target magnification is less than 1, the new magnification is equal to the target magnification multiplied by 0.7, introducing an interrupt to increase the efficiency of the process.

And S320, calculating a control value W according to CM.

S321, timer interrupt, write control value.

And S322, starting a timer for 2 times and 3 times of circulation.

S323, timer interrupt, write control value.

The method provided by the implementation can reasonably control the size of the fan according to the concentration of harmful gas in the mine, and compared with a common method relying on a single threshold, the automatic gain control can prevent the fan from being overlooked, embody the control process, and avoid false alarm and blind increase of the fan caused by sensor faults or other reasons.

Fig. 4 is a schematic structural diagram of an automatic gain control mine ventilation apparatus provided in an embodiment of the present invention, the apparatus including:

a concentration obtaining module 401, configured to obtain a plurality of harmful gas concentration values in a preset time period;

a data intensity calculating module 402, configured to determine a data intensity according to a peak value and a median value of the multiple harmful gas concentration values;

an adjustment coefficient calculation module 403, configured to calculate an adjustment coefficient according to the harmful gas safety threshold and the data intensity if the data intensity is greater than the harmful gas safety threshold;

a magnification determining module 404, configured to determine a target magnification according to the adjustment coefficient and the current magnification if the adjustment coefficient is greater than or equal to one;

and an automatic gain control module 405, configured to determine an automatic gain control value according to the target amplification factor and the automatic gain policy, and control the fan according to the automatic gain control value.

The automatic gain control mine ventilation device provided by the embodiment can determine the adjustment coefficient according to the data intensity of the concentration value of the harmful gas, and then determine the target amplification coefficient according to the adjustment coefficient, wherein the target amplification coefficient corresponds to the control value of the fan based on the automatic gain strategy, so that the air volume of the fan can be reasonably controlled, the air volume of the fan is prevented from being overlooked through automatic gain control, and the running stability of the fan is maintained.

Optionally, as an embodiment, the automatic gain control module 405 is specifically configured to:

if the target amplification factor is smaller than a first threshold value, determining that an automatic gain control value is zero; if the target amplification factor is greater than or equal to the first threshold and less than a second threshold, determining an automatic gain control value according to a first factor-control value fitting curve; if the target amplification factor is greater than or equal to the second threshold and less than a third threshold, determining an automatic gain control value according to a second multiplier-control value fitting curve; the slope of the second multiple-control value fitting curve is less than the slope of the first multiple-control value fitting curve; and if the target amplification factor is greater than or equal to the third threshold, determining the automatic gain control value as the maximum control value.

Optionally, as an embodiment, the preset time period is divided into a plurality of consecutive sub-time periods; the data intensity calculating module 402 is specifically configured to: determining a harmful gas concentration peak value corresponding to the harmful gas concentration value in each sub-period; and calculating the median of each harmful gas concentration peak value to obtain the data intensity.

Optionally, as an embodiment, the adjustment coefficient calculating module 403 is specifically configured to: and calculating the ratio of the data intensity to the harmful gas safety threshold value to obtain an adjustment coefficient.

Optionally, as an embodiment, the amplification factor determining module 404 is specifically configured to: and multiplying the current amplification factor by the adjusting coefficient to obtain the target amplification factor.

Optionally, as an embodiment, the automatic gain control module 405 is further configured to: if the adjusting coefficient is smaller than one, multiplying the current amplification factor by a preset value to obtain a target amplification factor; the preset value is less than one.

Optionally, as an embodiment, the apparatus further includes a timing module, configured to: and starting a timer to execute a plurality of cycles, and executing the step of controlling the fan according to the automatic gain control value after interruption.

The invention provides an automatic gain control mine ventilation system which comprises a controller, wherein the controller is used for executing the automatic gain control mine ventilation method.

Of course, those skilled in the art will understand that all or part of the processes in the methods of the above embodiments may be implemented by instructing the control device to perform operations through a computer, and the programs may be stored in a computer-readable storage medium, and when executed, the programs may include the processes of the above method embodiments, where the storage medium may be a memory, a magnetic disk, an optical disk, and the like.

In this document, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.