Intelligent control system and method based on hydrogen refueling station voice interaction

Abstract

The invention provides an intelligent control system and method based on voice interaction of a hydrogen refueling station, and the system comprises a PLC controller which is used for collecting the operation state data of a hydrogen refueling machine in real time, and is connected with a digital sound amplification intercom host through an RS485 communication interface; the digital sound amplification talkback host is in communication connection with the PLC and is used for receiving the control signal of the PLC and converting the control signal into a voice signal; the audio acquisition module comprises an explosion-proof microphone array and is connected with the digital input module of the PLC; the power amplification module is connected with the digital sound amplification talkback host and is used for amplifying the voice signal and then outputting the voice signal; a sound amplification intercom system is deeply integrated to a station control PLC system, a PLC + voice double-signal transmission channel is constructed, real-time conversion between equipment state data and voice signals is achieved, and the problem that a traditional hydrogen refueling station depends on electronic display equipment to conduct man-machine interaction and has anti-explosion potential safety hazards is solved.

Description

Technical Field

[0001] The present invention relates to the field of voice interaction technology, and in particular to an intelligent control system and method based on voice interaction at a hydrogen refueling station. Background Art

[0002] As an important part of hydrogen energy infrastructure, the safety and operation efficiency of hydrogen refueling stations directly affect the promotion and application of hydrogen energy vehicles. At present, the human-computer interaction of hydrogen refueling stations mainly relies on traditional display screens or touch screen devices, which have the following problems: 1. In a hydrogen environment, electronic display equipment has explosion-proof safety hazards and may cause explosion accidents due to electrical sparks; 2. Operators need to frequently check multiple terminal devices to obtain status information, which increases the complexity of operation. In addition, the lack of effective voice prompt function can easily lead to misoperation. 3. Independent deployment of multiple devices leads to poor system compatibility, high maintenance costs, and difficulty in centralized monitoring and management; Fourth, the traditional interaction method cannot meet the needs of modern hydrogen refueling stations for intelligence and convenience, and the user experience is poor; Therefore, an intelligent control system and method based on voice interaction of hydrogen refueling stations are proposed. Summary of the invention

[0003] In view of this, the present invention provides an intelligent control system and method based on voice interaction of a hydrogen refueling station to solve or alleviate the technical problems existing in the prior art and at least provide a beneficial option.

[0004] The technical solution of the present invention is implemented as follows: an intelligent control system based on voice interaction of a hydrogen refueling station comprises: PLC controller, used to collect the operating status data of the hydrogenation machine in real time, and connected with the digital amplification intercom host through the RS485 communication interface; A digital loudspeaker intercom host, which is in communication with the PLC controller and is used to receive the control signal of the PLC and convert it into a voice signal; An audio acquisition module, including an explosion-proof microphone array, connected to the digital input module of the PLC controller, for collecting voice commands of operators; A power amplifier module, connected to the digital sound amplification intercom host, for amplifying the voice signal and then outputting it; A directional speaker, connected to the power amplifier module, for playing voice prompt information; A sensor module, including a pressure sensor and a flow meter, connected to the PLC controller, for real-time monitoring of pressure and flow data during the hydrogenation process; Wherein, the PLC controller triggers corresponding voice broadcast through the digital loudspeaker intercom host according to the data collected by the sensor module.

[0005] Further preferably, the PLC controller further includes a voice trigger mechanism, and the voice trigger mechanism includes: The hydrogenation is completed and triggered. When the pulse signal of the flow meter returns to zero and the data of the pressure sensor is stable within the preset range, the PLC controller sends a trigger signal to the digital loudspeaker intercom host through the digital output module to start the settlement voice broadcast; Abnormal state triggering: when the data of the pressure sensor exceeds the preset threshold or the data of the flow meter is abnormal, the PLC controller triggers the alarm voice broadcast and plays it through the directional speaker; The timed broadcast function, based on the real-time clock (RTC) module built into the PLC controller, triggers a timed voice broadcast at the hour to remind the operator of the system operation status; Intercom mode is triggered. When the operator issues an intercom command through the explosion-proof microphone array, the PLC controller switches to intercom mode, allowing the operator to conduct two-way voice interaction with the system; Among them, the priority of the voice trigger mechanism is: abnormal state trigger > hydrogen refueling completion trigger > timed broadcast function > intercom mode trigger.

[0006] Further preferably, the voice broadcast content generation includes the following steps: Step S1: Hydrogenation completion announcement: The hydrogenation amount is calculated based on the data of the flow meter, and the settlement information is generated in combination with the preset unit price. The voice announcement content is: "Hydrogenation is completed. The amount of this filling is Liters, the amount is Yuan", of which: in, is the total number of flow meter pulses, is the flow meter pulse coefficient; is the preset unit price; Step S2, abnormal state broadcast, generate alarm voice content according to the over-limit value of the pressure sensor, the voice broadcast content is: "pressure abnormality, the current pressure is PMPa , please deal with it immediately"; Step S3, timed broadcast, generating hourly time reporting voice content according to the time data of the RTC module, the voice broadcast content is: "The current time is T point, the system is running normally."

[0007] Further preferably, the explosion-proof design of the explosion-proof microphone array, directional speaker and power amplifier module includes: Explosion-proof microphone array, in compliance with GB3836.1-2010 explosion-proof standard, adopts intrinsically safe circuit, power supply voltage ≤24VDC, protection grade IP66; Directional speaker, with cast aluminum housing, protection grade IP66, built-in explosion-proof connector, used for transition between explosion-proof area and non-explosion-proof area; An explosion-proof junction box, with built-in intrinsically safe wiring terminals, connected to the power amplifier module through an explosion-proof threading tube; The cable entry device complies with GB3836.15 standard, uses shielded twisted pair to transmit audio signals, and is equipped with an overcurrent protection device.

[0008] Further preferably, the digital sound amplification intercom host further includes a speech synthesis module and a DSP processing module, and the speech generation of the speech synthesis module includes: Voice template selection: select pre-stored voice templates according to event types, including hydrogenation completion, abnormal status, timed broadcast and intercom mode; Voice parameter adjustment: adjust the volume and speech speed of voice broadcast according to the ambient noise level. The volume adjustment formula is: in, is the base volume, is an increment that is dynamically adjusted according to the noise level; Speech noise reduction processing, the DSP processing module is used to suppress the environmental noise, and the signal-to-noise ratio (SNR) of the speech signal after noise reduction meets the following requirements: in, is the voice signal strength, is the noise signal strength.

[0009] Further preferably, the system supports the coordinated control of multiple hydrogenation machines, specifically including: Each hydrogenation machine is equipped with an independent directional speaker, and the PLC controller triggers voice broadcast according to the number partition of the hydrogenation machine; The status data of the multiple hydrogenation machines are transmitted to the PLC controller via the field bus; When multiple hydrogen refueling machines trigger voice broadcast at the same time, the PLC controller broadcasts in sequence according to the preset priority order, and the priority order is: abnormal state > hydrogenation completion > scheduled broadcast; Among them, the system supports the coordinated control of up to 32 hydrogen refueling machines.

[0010] Further preferably, the data processing method of the PLC controller includes: real-time acquisition of data from the pressure sensor and the flow meter, with a sampling frequency of 10 Hz, and smoothing the acquired data using a sliding average filter algorithm, the filter formula being: in, is the filtered data, is the original data, is the sliding window size; When the pressure data exceeds the preset threshold or the flow data is abnormal, an alarm voice broadcast is triggered; The operation records and abnormal events are saved to the SD card. The log file format is CSV, which supports fault tracing and analysis.

[0011] Further preferably, in the installation and debugging of the system, the explosion-proof microphone array and the directional speaker are installed in the explosion-proof area of ​​the hydrogenator, and the PLC controller and the power amplifier module are installed in the non-explosion-proof area, maintaining a safe distance from the explosion-proof area. The voice trigger parameters, including the pressure threshold, flow pulse coefficient and voice template, are configured through the debugging interface of the PLC controller, and the hydrogenation completion trigger, abnormal state trigger, timed broadcast function and intercom mode are tested in turn to ensure the normal operation of the system.

[0012] In addition, the present invention also provides a method for an intelligent control system based on voice interaction of a hydrogen refueling station, comprising the following steps: Step S1: System initialization and self-checking, starting the PLC controller, initializing the digital sound amplification intercom host, audio acquisition module, power amplifier module, directional speaker and sensor module, and completing the self-checking and communication connection of each module; Step S2: real-time data collection, using a pressure sensor and a flow meter to collect pressure and flow data during the hydrogenation process in real time, and transmit the data to a PLC controller; Step S3: Data abnormality judgment, judging whether the pressure data exceeds the preset threshold or whether the flow data is abnormal, if it is abnormal, proceed to step S4, otherwise proceed to step S5; Step S4: abnormal state voice broadcast, generate alarm voice content, and output the alarm voice through the digital sound amplification intercom host, power amplifier module and directional speaker; Step S5: Determine whether the hydrogenation is completed, determine whether the pulse signal of the flow meter is zeroed and whether the pressure data is stable within a preset range. If the conditions are met, proceed to step S6, otherwise return to step S2; Step S6: Voice broadcast of hydrogen refueling completion is performed, settlement voice content is generated, and the settlement voice is output through the digital sound amplification intercom host, power amplifier module and directional speaker; Step S7: Timed voice broadcast, based on the real-time clock (RTC) module built into the PLC controller, generates timed voice content at the hour, and outputs the timed voice through the digital amplification intercom host, power amplifier module and directional speaker; Step S8: Intercom mode processing: when the operator issues an intercom command through the explosion-proof microphone array, the intercom mode is switched to realize two-way voice interaction between the operator and the system; Step S9: Log recording and storage, saving operation records and abnormal events to the SD card, generating log files, and supporting fault tracing and analysis.

[0013] The embodiment of the present invention has the following advantages due to the adoption of the above technical solution: 1. The present invention deeply integrates the loudspeaker intercom system into the station control PLC system to build a "PLC+voice" dual signal transmission channel, realizing the real-time conversion of equipment status data and voice signals. Traditional hydrogen refueling stations rely on electronic display devices for human-computer interaction, which has explosion-proof safety hazards. The present invention adopts a voice interaction system with explosion-proof design, which fully complies with the GB3836.1-2010 explosion-proof standard, eliminates the risk of explosion in a hydrogen environment, and monitors pressure, flow and other data in real time, and automatically triggers an alarm voice broadcast in an abnormal state, further improving the safety of the hydrogen refueling station; Second, the present invention realizes the two-way interaction between operation instructions and PLC control signals through the "PLC+voice" dual signal transmission channel, thereby improving the efficiency of human-computer interaction; operators of traditional hydrogen refueling stations need to frequently check multiple terminal devices to obtain status information, while the present invention converts the device status data into voice signals in real time through the voice broadcast function, so that operators can obtain key information without distractingly checking the screen; the voice response time is ≤0.5 seconds, which is much faster than the traditional interaction method, reducing the operation error rate and improving work efficiency; 3. The present invention supports two-way intercom function. The staff can query the equipment status or issue operation instructions through the explosion-proof microphone array, and the system will feedback relevant information through voice broadcast. This interactive mode not only simplifies the operation process, but also improves the user experience. Traditional hydrogen refueling stations lack effective voice interaction functions, and operators need to rely on complex menus and buttons to operate. The present invention uses natural language interaction to make the operation more intuitive and convenient, which is particularly suitable for hydrogen refueling station scenarios in high-noise environments. Fourth, the present invention reduces the use of electronic display equipment, reduces equipment complexity and deployment costs by integrating the sound amplification intercom system with the PLC control system.

[0014] The above summary is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments and features described above, further aspects, embodiments and features of the present invention will be readily apparent by reference to the accompanying drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 is a system architecture diagram of the present invention; Figure 2 This is a PLC signal processing flow chart of the present invention. DETAILED DESCRIPTION

[0017] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0018] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0019] Example 1 like Figure 1-2 As shown, the embodiment of the present invention provides an intelligent control system based on voice interaction of a hydrogen refueling station, including: PLC controller, used to collect the operating status data of the hydrogenation machine in real time, and connected with the digital amplification intercom host through the RS485 communication interface; The digital sound amplification intercom host is connected to the PLC controller for receiving the control signal of the PLC and converting it into a voice signal; An audio acquisition module, including an explosion-proof microphone array, is connected to the digital input module of the PLC controller to collect the operator's voice commands; The power amplifier module is connected to the digital sound amplification intercom host and is used to amplify the voice signal and then output it; A directional speaker, connected to the power amplifier module, is used to play voice prompt information; The sensor module, including a pressure sensor and a flow meter, is connected to the PLC controller to monitor the pressure and flow data during the hydrogenation process in real time; Among them, the PLC controller includes a voice trigger mechanism, including: The hydrogenation is completed and triggered. When the pulse signal of the flow meter returns to zero and the data of the pressure sensor is stable within the preset range, for example, the pressure value is set between 20-25MPa, the PLC controller sends a trigger signal to the digital loudspeaker intercom host through the digital output module to start the settlement voice broadcast. The settlement voice content is based on the total number of pulses of the flow meter. and pulse coefficient Calculate the amount of hydrogen added , and combined with the preset unit price Generate settlement amount The final report was: "Hydrogen refueling completed, the amount of this refueling is Liters, the amount is Yuan"; Abnormal state trigger: when the data of the pressure sensor exceeds the preset threshold, such as the pressure value > 30MPa or the data of the flow meter is abnormal, the PLC controller triggers the alarm voice broadcast and plays it through the directional speaker. The alarm voice content is generated according to the abnormality type, such as "pressure abnormality, the current pressure is PPMPa, please deal with it immediately" or "flow abnormality, please check the equipment"; The timed broadcast function is based on the real-time clock (RTC) module built into the PLC controller. It triggers a timed voice broadcast at the hour to remind the operator of the system operation status. The timed voice content is: "The current time is T, and the system is running normally"; Intercom mode trigger: When the operator issues an intercom command through the explosion-proof microphone array, such as "query equipment status", the PLC controller switches to intercom mode, allowing the operator to have two-way voice interaction with the system. The system generates feedback content based on the operator's command, such as "equipment status is normal" or "please check the pressure sensor"; The method for generating voice broadcast content is divided into three types according to the operating status of the hydrogen refueling station: hydrogen refueling completion broadcast, abnormal status broadcast and scheduled broadcast. The specific implementation method is as follows: Hydrogenation completion broadcast: When the hydrogenation process is completed, the system calculates the amount of hydrogenation based on the data of the flow meter, and generates settlement information based on the preset unit price. and pulse coefficient , calculate the amount of hydrogenation : is the total number of flow meter pulses, is the flow meter pulse coefficient; According to the amount of hydrogenation and preset unit price , calculate the settlement amount : Generate voice announcement: "Hydrogen refueling completed, this refueling volume is Liters, the amount is Yuan", and output through the digital sound amplification intercom host, power amplifier module and directional speaker; In addition, when the system detects an abnormal state, an alarm voice content is generated according to the over-limit value of the pressure sensor. When the data of the pressure sensor exceeds the preset threshold, an alarm voice content is generated: "The pressure is abnormal, the current pressure is PMPa , please deal with it immediately"; When the flow meter data is abnormal, an alarm voice message is generated: "Flow is abnormal, please check the device"; The alarm voice content is output through the digital amplification intercom host, power amplifier module and directional speaker; Based on the real-time clock (RTC) module built into the PLC controller, a timed voice content is generated at the hour, and the hourly time announcement voice content is generated according to the time data of the RTC module: "The current time is T, and the system is running normally"; The timed voice content is output through the digital amplification intercom host, power amplifier module and directional speaker.

[0020] Example 2 The explosion-proof design of this system includes the following: The explosion-proof microphone array complies with the GB3836.1-2010 explosion-proof standard, adopts an intrinsically safe circuit design, has a power supply voltage of ≤24VDC, and a protection level of IP66. It can operate safely in a hydrogen environment to avoid the risk of explosion caused by electrical sparks. It has dustproof, waterproof and explosion-proof functions to ensure long-term stable operation in harsh environments. Directional speaker, with cast aluminum housing, protection grade IP66, built-in explosion-proof connector, used for transition between explosion-proof area and non-explosion-proof area; The explosion-proof junction box has built-in intrinsically safe terminal blocks, which are connected to the power amplifier module through explosion-proof conduits, effectively preventing damage to the cables by the external environment. It also complies with the GB3836.15 standard, further enhancing the safety of the system. The cable entry device complies with GB3836.15 standard, uses shielded twisted pair to transmit audio signals, and is equipped with an overcurrent protection device. Through the fully sealed structure and the application of explosion-proof sealant, it ensures the safe operation of the system in a hydrogen environment, eliminates explosion hazards, and meets the high safety requirements of hydrogen refueling stations.

[0021] The digital sound amplification intercom host in this system also includes a speech synthesis module and a DSP processing module. The dynamic adjustment and noise reduction processing of the speech synthesis module improve the clarity of voice broadcasting, ensuring that the voice content can still be clearly conveyed in a high-noise environment. Its speech generation includes: Select the pre-stored voice template according to the event type, which includes hydrogenation completion, abnormal state, timed broadcast and intercom mode. Adjust the volume and speed of the voice broadcast according to the ambient noise level. The volume adjustment formula is: in, is the base volume, is an increment that is dynamically adjusted according to the noise level; The DSP processing module suppresses the environmental noise, and the signal-to-noise ratio (SNR) of the voice signal after noise reduction meets in, is the voice signal strength, is the noise signal strength.

[0022] Example 3 This embodiment provides an intelligent voice interaction system that supports coordinated control of multiple hydrogen refueling machines, including: Each hydrogenation machine is equipped with an independent directional speaker. The PLC controller triggers voice broadcast according to the number partition of the hydrogenation machine. Each hydrogenation machine is equipped with an independent directional speaker to ensure that the voice broadcast is only for a specific area to avoid interference with other areas. For example, when hydrogenation machine A completes the filling, only the voice broadcast of area A is triggered to avoid interference with other areas. The status data of multiple hydrogenation machines are transmitted to the PLC controller through the field bus, RS485 or CAN bus to achieve centralized monitoring and unified management. The status data of multiple hydrogenation machines are centrally transmitted to the PLC controller through the field bus to achieve unified monitoring and management, reducing the complexity of the system. The PLC controller collects the pressure and flow data of each hydrogenation machine in real time and stores them in the local database; When multiple hydrogen refueling machines trigger voice broadcasts at the same time, the PLC controller broadcasts in sequence according to the preset priority order. The system gives priority to abnormal status information to ensure that emergency events can be handled in a timely manner. The priority order is: abnormal status > hydrogenation completion > scheduled broadcast; For example, when hydrogenation machine A triggers an abnormal status broadcast and hydrogenation machine B triggers a hydrogenation completion broadcast, the system prioritizes broadcasting the abnormal status information of hydrogenation machine A.

[0023] The data of the pressure sensor and flow meter of each hydrogenation machine are collected in real time with a sampling frequency of 10Hz to ensure the real-time and accuracy of the data. The collected data are smoothed by the sliding average filtering algorithm. The data of the PLC controller is processed by smoothing the collected data with the sliding average filtering algorithm, which effectively eliminates random noise and improves the reliability of the data. The filtering formula is: in, is the filtered data, is the original data, It is a sliding window size. When the pressure data exceeds the preset threshold or the flow data is abnormal, the PLC controller triggers an alarm voice broadcast and plays it through the directional speaker. The operation records and abnormal events are saved to the SD card. The log file format is CSV, which supports fault backtracking and analysis. The log content includes timestamp, event type, hydrogenation machine number, pressure value, flow value information. The real-time monitoring and abnormality detection functions ensure the safety of the hydrogenation process and avoid safety accidents caused by equipment failure.

[0024] Installation and debugging of the system: explosion-proof microphone array and directional speaker are installed in the explosion-proof area of ​​the hydrogenator, PLC controller and power amplifier module are installed in the non-explosion-proof area, keeping a safe distance from the explosion-proof area. Voice trigger parameters are configured through the debugging interface of the PLC controller, including pressure threshold, flow pulse coefficient and voice template. The hydrogenation completion trigger, abnormal status trigger, timed broadcast function and intercom mode are tested in turn to ensure the normal operation of the system.

[0025] Example 4 The present invention also provides a method for an intelligent control system based on voice interaction of a hydrogen refueling station, comprising the following steps: Step S1: System initialization and self-checking, starting the PLC controller, initializing the digital sound amplification intercom host, audio acquisition module, power amplifier module, directional speaker and sensor module, and completing the self-checking and communication connection of each module; Step S2: real-time data collection, using a pressure sensor and a flow meter to collect pressure and flow data during the hydrogenation process in real time, and transmit the data to a PLC controller; Step S3: Data abnormality judgment, judging whether the pressure data exceeds the preset threshold or whether the flow data is abnormal, if it is abnormal, proceed to step S4, otherwise proceed to step S5; Step S4: abnormal state voice broadcast, generate alarm voice content, and output the alarm voice through the digital sound amplification intercom host, power amplifier module and directional speaker; Step S5: Determine whether the hydrogenation is completed, determine whether the pulse signal of the flow meter is zeroed and whether the pressure data is stable within a preset range. If the conditions are met, proceed to step S6, otherwise return to step S2; Step S6: Voice broadcast of hydrogen refueling completion is performed, settlement voice content is generated, and the settlement voice is output through the digital sound amplification intercom host, power amplifier module and directional speaker; Step S7: Timed voice broadcast, based on the real-time clock (RTC) module built into the PLC controller, generates timed voice content at the hour, and outputs the timed voice through the digital amplification intercom host, power amplifier module and directional speaker; Step S8: Intercom mode processing: when the operator issues an intercom command through the explosion-proof microphone array, the intercom mode is switched to realize two-way voice interaction between the operator and the system; Step S9: Log recording and storage, saving operation records and abnormal events to the SD card, generating log files, and supporting fault tracing and analysis.

[0026] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of various changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. Intelligent control system based on voice interaction of hydrogen refueling station, characterized by: include PLC controller, used to collect the operating status data of the hydrogenation machine in real time, and connected with the digital amplification intercom host through the RS485 communication interface; A digital loudspeaker intercom host, which is in communication with the PLC controller and is used to receive the control signal of the PLC and convert it into a voice signal; An audio acquisition module, including an explosion-proof microphone array, connected to the digital input module of the PLC controller, for collecting voice commands of operators; A power amplifier module, connected to the digital sound amplification intercom host, for amplifying the voice signal and then outputting it; A directional speaker, connected to the power amplifier module, for playing voice prompt information; A sensor module, including a pressure sensor and a flow meter, connected to the PLC controller, for real-time monitoring of pressure and flow data during the hydrogenation process; Wherein, the PLC controller triggers corresponding voice broadcast through the digital loudspeaker intercom host according to the data collected by the sensor module.

2. The intelligent control system based on voice interaction of hydrogen refueling station according to claim 1 is characterized in that: The PLC controller also includes a voice trigger mechanism, which includes: The hydrogenation is completed and triggered. When the pulse signal of the flow meter returns to zero and the data of the pressure sensor is stable within the preset range, the PLC controller sends a trigger signal to the digital loudspeaker intercom host through the digital output module to start the settlement voice broadcast; Abnormal state triggering: when the data of the pressure sensor exceeds the preset threshold or the data of the flow meter is abnormal, the PLC controller triggers the alarm voice broadcast and plays it through the directional speaker; The timed broadcast function, based on the real-time clock (RTC) module built into the PLC controller, triggers a timed voice broadcast at the hour to remind the operator of the system operation status; Intercom mode is triggered. When the operator issues an intercom command through the explosion-proof microphone array, the PLC controller switches to intercom mode, allowing the operator to conduct two-way voice interaction with the system; Among them, the priority of the voice trigger mechanism is: abnormal state trigger > hydrogen refueling completion trigger > timed broadcast function > intercom mode trigger.

3. The intelligent control system based on voice interaction of hydrogen refueling station according to claim 2 is characterized in that: The voice broadcast content generation comprises the following steps: Step S1: Hydrogenation completion announcement: The hydrogenation amount is calculated based on the data of the flow meter, and the settlement information is generated in combination with the preset unit price. The voice announcement content is: "Hydrogenation is completed. The amount of this filling is Liters, the amount is Yuan", of which: in, is the total number of flow meter pulses, is the flow meter pulse coefficient; is the preset unit price; Step S2, abnormal state broadcast, generate alarm voice content according to the over-limit value of the pressure sensor, the voice broadcast content is: "pressure abnormal, the current pressure is PMPa , please process immediately"; Step S3, timed broadcast, generating hourly time reporting voice content according to the time data of the RTC module, the voice broadcast content is: "The current time is T point, the system is running normally".

4. The intelligent control system based on voice interaction of hydrogen refueling station according to claim 1 is characterized in that: The explosion-proof design of the explosion-proof microphone array, directional speaker and power amplifier module includes: Explosion-proof microphone array, in compliance with GB3836.1-2010 explosion-proof standard, adopts intrinsically safe circuit, power supply voltage ≤24VDC, protection grade IP66; Directional speaker, with cast aluminum housing, protection grade IP66, built-in explosion-proof connector, used for transition between explosion-proof area and non-explosion-proof area; An explosion-proof junction box, with built-in intrinsically safe wiring terminals, connected to the power amplifier module through an explosion-proof threading tube; The cable entry device complies with GB3836.15 standard, uses shielded twisted pair to transmit audio signals, and is equipped with an overcurrent protection device.

5. The intelligent control system based on voice interaction of hydrogen refueling station according to claim 1 is characterized by: The digital sound amplification intercom host also includes a speech synthesis module and a DSP processing module, and the speech generation of the speech synthesis module includes: Voice template selection: select pre-stored voice templates according to event types, including hydrogenation completion, abnormal status, timed broadcast and intercom mode; Voice parameter adjustment: adjust the volume and speech speed of voice broadcast according to the ambient noise level. The volume adjustment formula is: in, is the base volume, is an increment that is dynamically adjusted according to the noise level; Speech noise reduction processing, the DSP processing module is used to suppress the environmental noise, and the signal-to-noise ratio (SNR) of the speech signal after noise reduction meets the following requirements: in, is the voice signal strength, is the noise signal strength.

6. The intelligent control system based on voice interaction of hydrogen refueling station according to claim 1 is characterized by: The system supports the coordinated control of multiple hydrogenation machines, including: Each hydrogenation machine is equipped with an independent directional speaker, and the PLC controller triggers voice broadcast according to the number partition of the hydrogenation machine; The status data of the multiple hydrogenation machines are transmitted to the PLC controller via the field bus; When multiple hydrogen refueling machines trigger voice broadcast at the same time, the PLC controller broadcasts in sequence according to the preset priority order, and the priority order is: abnormal state > hydrogenation completion > scheduled broadcast; Among them, the system supports the coordinated control of up to 32 hydrogen refueling machines.

7. The intelligent control system based on voice interaction of hydrogen refueling station according to claim 1 is characterized by: The data processing method of the PLC controller includes: real-time acquisition of data from the pressure sensor and the flow meter, with a sampling frequency of 10 Hz, and smoothing the acquired data using a sliding average filter algorithm, the filter formula being: in, is the filtered data, is the original data, is the sliding window size; When the pressure data exceeds the preset threshold or the flow data is abnormal, an alarm voice broadcast is triggered; The operation records and abnormal events are saved to the SD card. The log file format is CSV, which supports fault tracing and analysis.

8. The intelligent control system based on voice interaction of hydrogen refueling station according to claim 1 is characterized by: The installation and debugging of the system, the explosion-proof microphone array and directional speaker are installed in the explosion-proof area of ​​the hydrogenator, the PLC controller and power amplifier module are installed in the non-explosion-proof area, and keep a safe distance from the explosion-proof area. The voice trigger parameters, including pressure threshold, flow pulse coefficient and voice template, are configured through the debugging interface of the PLC controller, and the hydrogenation completion trigger, abnormal state trigger, timed broadcast function and intercom mode are tested in turn to ensure the normal operation of the system.

9. The method of intelligent control system based on voice interaction of hydrogen refueling station according to any one of claims 1 to 8, characterized in that: The following steps are involved: Step S1: System initialization and self-checking, starting the PLC controller, initializing the digital sound amplification intercom host, audio acquisition module, power amplifier module, directional speaker and sensor module, and completing the self-checking and communication connection of each module; Step S2: real-time data collection, using a pressure sensor and a flow meter to collect pressure and flow data during the hydrogenation process in real time, and transmit the data to a PLC controller; Step S3: Data abnormality judgment, judging whether the pressure data exceeds the preset threshold or whether the flow data is abnormal, if it is abnormal, proceed to step S4, otherwise proceed to step S5; Step S4: abnormal state voice broadcast, generate alarm voice content, and output the alarm voice through the digital sound amplification intercom host, power amplifier module and directional speaker; Step S5: Determine whether the hydrogenation is completed, determine whether the pulse signal of the flow meter is zeroed and whether the pressure data is stable within a preset range. If the conditions are met, proceed to step S6, otherwise return to step S2; Step S6: Voice broadcast of hydrogen refueling completion is performed, settlement voice content is generated, and the settlement voice is output through the digital sound amplification intercom host, power amplifier module and directional speaker; Step S7: Timed voice broadcast, based on the real-time clock (RTC) module built into the PLC controller, generates timed voice content at the hour, and outputs the timed voice through the digital amplification intercom host, power amplifier module and directional speaker; Step S8: Intercom mode processing: when the operator issues an intercom command through the explosion-proof microphone array, the intercom mode is switched to realize two-way voice interaction between the operator and the system; Step S9: Log recording and storage, saving operation records and abnormal events to the SD card, generating log files, and supporting fault tracing and analysis.

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