A data acquisition device and method based on the digital signal level detection of a fuel dispenser display screen

Abstract

A data acquisition device and method based on the digital signal level detection of a fuel dispenser display screen, relating to the technical field of fuel dispenser data acquisition and monitoring, comprising a hardware layer, a signal processing layer, a data application layer, and a data output and communication module; the hardware layer comprises a display screen pin acquisition unit, a flexible circuit board connector, and a power management module; the flexible circuit board connector is equipped with a shielded flexible cable and a spring adjustable elastic contact pin, the elastic contact pin has a contact impedance of less than or equal to 0.1Ω, and the flexible circuit board connector is compatible with 48-pin, 50-pin, 65-pin, 88-pin, 94-pin, and 132-pin display screen interfaces; and the display screen pin acquisition unit adopts a high-impedance parallel architecture to non-invasively access the SEG and COM drive pins of the display screen. The present application non-invasively accesses the SEG and COM drive pins of the fuel dispenser display screen through a high-impedance parallel architecture, directly acquires the underlying digital level signal, and completely avoids external environmental interference such as light, screen stains, picture reflection, pixel deviation, and shooting angle.

Description

Technical Field

[0001] This invention relates to the field of data acquisition and monitoring technology for fuel dispensers, and in particular to a data acquisition device and method based on the detection of digital signal levels on the fuel dispenser display screen. Background Technology

[0002] As the core equipment for measuring the retail volume of refined oil products, fuel dispensers provide crucial data on fuel volume, amount, unit price, and cumulative fuel consumption. This data, along with measurement data, forms the basis for market supervision, tax accounting, transaction traceability, and anti-measurement fraud. With the continuous improvement of the refined oil industry's regulatory system, higher demands are placed on the authenticity, real-time performance, versatility, and tamper-proof capabilities of fuel dispenser data collection. Accurate, reliable, and non-intervention-based fuel dispenser data acquisition technology has become key to ensuring fair refined oil transactions and regulating industry operations.

[0003] Current data collection methods mostly rely on image recognition, which involves capturing images of the display screen and identifying numbers using a camera. This method involves large and expensive equipment, and is susceptible to external factors such as lighting, screen dirt, image reflection, and pixel deviation. As a result, the accuracy of recognition fluctuates greatly, and the image parsing delay is high. It is also impossible to achieve real-time synchronous data collection and is not suitable for the 24 / 7, routine, and high-precision data collection and monitoring scenarios of gas stations. Summary of the Invention

[0004] This invention proposes a data acquisition device and method based on the detection of digital signal level on a fuel dispenser display screen.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A data acquisition device based on digital signal level detection of a fuel dispenser display screen includes a hardware layer, a signal processing layer, a data application layer, and a data output and communication module. The hardware layer includes a display screen pin acquisition unit, a flexible circuit board connector, and a power management module. The flexible circuit board connector is equipped with a shielded flexible cable and spring-adjustable elastic contact pins with a contact impedance ≤0.1Ω. The flexible circuit board connector is compatible with 48-pin, 50-pin, 65-pin, 88-pin, 94-pin, and 132-pin display screen interfaces. The display screen pin acquisition unit uses a high-impedance parallel architecture for non-intrusive access to the display screen's SEG and COM driver pins. The power management module supports a wide voltage input of 9–36V. The signal processing layer includes a signal conditioning circuit, an adaptive level conversion circuit, and an anti-interference digital filter circuit. The signal conditioning circuit integrates a programmable gain amplifier. The anti-interference digital filter circuit consists of a second-order low-pass filter circuit and a 12-bit analog-to-digital converter chip with a 1kHz sampling rate and a built-in 50ms sliding filter. The system incorporates window mean filtering and sliding window variance analysis algorithms; the signal processing layer supports nanosecond-level synchronous sampling of up to 132 pin signals; the data application layer is equipped with a 32-bit STM32F4 series main control unit with a main frequency of 168MHz, including a segment code timing analysis unit, a driver protocol library, and an eight-segment code reconstruction unit; the driver protocol library pre-stores more than 20 timing characteristics of fuel dispenser display driver ICs; the eight-segment code reconstruction unit has a fault-tolerant data reconstruction mechanism; the main control unit has a built-in CRC-16-CCITT check algorithm with a polynomial of 0x1021; the data output and communication modules feature a dual-mode pluggable hot-switching architecture for RS485 wired and 4G / 5G wireless; the RS485 channel uses the Modbus RTU protocol, the wireless channel is equipped with a Y100E communication module, the transmission link uses HTTPS encryption, and the service data uses AES-128 symmetric encryption; the communication module outputs unified JSON format data packets, supporting OTA remote upgrades of the driver protocol library, filtering algorithms, and anti-counterfeiting verification logic.

[0006] A further preferred embodiment of the present invention is: the adaptive level conversion circuit dynamically sets a ±2% floating threshold to automatically adapt to the driving levels of different amplitude displays of 3.3V, 5V, and 12V.

[0007] A further preferred embodiment of the present invention is as follows: the data application layer also integrates a hardware signal fingerprint anti-counterfeiting verification unit; the hardware signal fingerprint anti-counterfeiting verification unit extracts the rising and falling edge timing features of the level signal as signal fingerprints, and simultaneously collects the output signal of the fuel dispenser main control board to complete dual-channel cross-verification. When the signal fingerprints do not match or the difference between the two channels exceeds the threshold, a cheating anomaly alarm is generated.

[0008] A data acquisition method based on digital signal level detection of a fuel dispenser display screen includes the following steps: S1. The elastic contact pin is attached to the driving pin of the fuel dispenser display screen, the shielded flexible cable is connected to the hardware layer through the flexible circuit board connector, and the power module is connected to the DC power supply of the fuel dispenser. S2, The display pin acquisition unit adopts a high-impedance parallel architecture to acquire the real-time level of all SEG and COM pins in parallel. The 12-bit analog-to-digital converter chip acquires multiple raw level signals synchronously at a sampling rate of 1kHz. S3. Multiple raw level signals are automatically adjusted by a programmable gain amplifier based on the input level, and the adaptive level conversion circuit is configured with a ±2% dynamic threshold. The oil pump motor electromagnetic pulse and backlight voltage fluctuation noise are filtered out by sliding window mean filtering combined with variance analysis. S4. The data application layer collects the scanning timing of the display driver pins and compares it with more than 20 driver IC features in the built-in driver protocol library to automatically match the corresponding segment code decoding rules. S5. Reconstruct the eight-segment code based on the SEG and COM level combination; if some elastic probes fail to contact, reconstruct the transaction code completely based on the remaining effective channel timing, historical sampling data and CRC check code. S6. Extract the timing characteristics of the level signal as a signal fingerprint, synchronously read the output data of the fuel dispenser main control board for cross-comparison, and upload an abnormal alarm when it is determined that there is data tampering or analog signal injection. S7. The reconstructed unit price, fuel volume, and transaction timestamp data are encapsulated into a JSON data packet after CRC-16-CCITT integrity verification; and automatically switched to RS485 wired Modbus RT transmission or 4G / 5G wireless HTTPS+AES-128 encrypted transmission to the cloud according to the on-site network environment.

[0009] A further preferred embodiment of the present invention is as follows: In step S7, the RS485 wired transmission uses shielded twisted-pair cable, with a transmission distance ≤50m and a communication baud rate of 115200bps.

[0010] A further preferred embodiment of the present invention: the cheating anomaly alarm data packet in step S6 is accompanied by the original feature of the level signal fingerprint.

[0011] A further preferred embodiment of the present invention is that the transaction data reconstructed in step S5 supports cross-verification of data from the local gas station management system, the tax control supervision cloud platform, and the refined oil market supervision platform.

[0012] The present invention has the following technical effects: 1. This invention utilizes a high-impedance parallel architecture to non-intrusively access the SEG and COM driver pins of the fuel dispenser display screen, directly acquiring the underlying digital level signals. This completely avoids interference from external environmental factors such as lighting, screen stains, image reflections, pixel deviations, and shooting angles. Simultaneously, the device is equipped with a 12-bit analog-to-digital converter chip, coupled with a second-order low-pass filter circuit, a 50ms sliding window mean filter, and a variance analysis algorithm. This effectively filters out industrial noise interference such as electromagnetic pulses from the fuel pump motor and backlight voltage fluctuations. Combined with nanosecond-level multi-channel synchronous sampling capabilities, it fundamentally solves the problems of large fluctuations in accuracy and poor stability in traditional image recognition, achieving high-precision data acquisition around the clock. This perfectly adapts to the routine and uninterrupted monitoring and data collection scenarios of gas stations.

[0013] 2. The flexible circuit board connector of this invention is compatible with a variety of mainstream fuel dispenser display interfaces, including 48-pin, 50-pin, 65-pin, 88-pin, 94-pin, and 132-pin connectors. It can be adapted to the vast majority of brands and models of fuel dispensers on the market, making it highly versatile and widely adaptable, suitable for large-scale mass production and application. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the principle framework of the present invention; Detailed Implementation

[0015] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0016] according to Figure 1As shown, a data acquisition device based on digital signal level detection of a fuel dispenser display screen includes a hardware layer, a signal processing layer, a data application layer, and a data output and communication module. The hardware layer includes a display screen pin acquisition unit, a flexible circuit board connector, and a power management module. The flexible circuit board connector is equipped with a shielded flexible cable and spring-adjustable elastic contact pins with a contact impedance ≤0.1Ω. The flexible circuit board connector is compatible with 48-pin, 50-pin, 65-pin, 88-pin, 94-pin, and 132-pin display screen interfaces. The display screen pin acquisition unit adopts a high-impedance parallel architecture for non-intrusive access to the SEG and COM drive pins of the display screen. Its access process will not interfere with or disrupt the original display screen drive circuit and main control system operation of the fuel dispenser. It does not require disassembly or modification of the fuel dispenser's core equipment and will not affect the original metering accuracy or equipment performance of the fuel dispenser, complying with the safety supervision regulations for refined oil equipment. Meanwhile, the shielded flexible cable can effectively resist external electromagnetic interference, further improving the operational stability of the equipment in the complex industrial environment of gas stations, balancing data acquisition accuracy and equipment operation safety; the power management module supports a wide voltage input of 9-36V; the signal processing layer includes a signal conditioning circuit, an adaptive level conversion circuit, and an anti-interference digital filter circuit; the signal conditioning circuit integrates a programmable gain amplifier; the anti-interference digital filter circuit consists of a second-order low-pass filter circuit and a 12-bit analog-to-digital converter chip, with a sampling rate of 1kHz and built-in 50ms sliding window mean filtering and sliding window variance analysis algorithms; the signal processing layer It supports nanosecond-level synchronous sampling of up to 132 pin signals; the data application layer is equipped with a 32-bit STM32F4 series main control unit with a main frequency of 168MHz, including a segment code timing analysis unit, a driver protocol library, and an eight-segment code reconstruction unit; the driver protocol library pre-stores more than 20 timing characteristics of fuel dispenser display driver ICs; the eight-segment code reconstruction unit has a fault-tolerant data reconstruction mechanism; the main control unit has a built-in CRC-16-CCITT check algorithm with a polynomial of 0x1021; the data output and communication module is an RS485 wired and 4G / 5G wireless dual-mode pluggable hot-switching architecture; the RS485 channel adopts the Modbus RTU protocol, the wireless channel is equipped with a Y100E communication module, the transmission link adopts HTTPS encryption, and the service data adopts AES-128 symmetric encryption; the communication module outputs a unified JSON format data packet, supporting OTA remote upgrades of the driver protocol library, filtering algorithm, and anti-counterfeiting verification logic.

[0017] The adaptive level conversion circuit dynamically sets a ±2% floating threshold to automatically adapt to the drive levels of different amplitude displays, such as 3.3V, 5V, and 12V.

[0018] The data application layer also integrates a hardware signal fingerprint anti-counterfeiting verification unit; the hardware signal fingerprint anti-counterfeiting verification unit extracts the rising and falling edge timing features of the level signal as the signal fingerprint, and simultaneously collects the output signal of the fuel dispenser main control board to complete dual-channel cross-verification. When the signal fingerprint does not match or the difference between the two channels exceeds the threshold, a cheating anomaly alarm is generated.

[0019] The device has a total power consumption of <2W, a total delay of <5ms from signal acquisition to data output, a steady-state acquisition error of ≤0.8%, a continuous operation data interruption rate of ≤0.5%, and can operate stably in an environment of -40℃ to 70℃ and 95% humidity.

[0020] A data acquisition method based on digital signal level detection of a fuel dispenser display screen includes the following steps: S1. The elastic contact pin is attached to the driving pin of the fuel dispenser display screen, the shielded flexible cable is connected to the hardware layer through the flexible circuit board connector, and the power module is connected to the DC power supply of the fuel dispenser. S2, The display pin acquisition unit adopts a high-impedance parallel architecture to acquire the real-time level of all SEG and COM pins in parallel. The 12-bit analog-to-digital converter chip acquires multiple raw level signals synchronously at a sampling rate of 1kHz. S3. Multiple raw level signals are automatically adjusted by a programmable gain amplifier based on the input level, and the adaptive level conversion circuit is configured with a ±2% dynamic threshold. The oil pump motor electromagnetic pulse and backlight voltage fluctuation noise are filtered out by sliding window mean filtering combined with variance analysis. S4. The data application layer collects the scanning timing of the display driver pins and compares it with more than 20 driver IC features in the built-in driver protocol library to automatically match the corresponding segment code decoding rules. S5. Reconstruct the eight-segment code based on the SEG and COM level combination; if some elastic probes fail to contact, reconstruct the transaction code completely based on the remaining effective channel timing, historical sampling data and CRC check code. S6. Extract the timing characteristics of the level signal as a signal fingerprint, synchronously read the output data of the fuel dispenser main control board for cross-comparison, and upload an abnormal alarm when it is determined that there is data tampering or analog signal injection. S7. The reconstructed unit price, fuel volume, and transaction timestamp data are encapsulated into a JSON data packet after CRC-16-CCITT integrity verification; and automatically switched to RS485 wired Modbus RT transmission or 4G / 5G wireless HTTPS+AES-128 encrypted transmission to the cloud according to the on-site network environment.

[0021] In step S7, the RS485 wired transmission uses shielded twisted-pair cable, with a transmission distance of ≤50m and a communication baud rate of 115200bps.

[0022] In step S6, the cheating anomaly alarm data packet includes the original characteristics of the level signal fingerprint.

[0023] The transaction data reconstructed in step S5 supports cross-verification of data from the local gas station management system, the tax control supervision cloud, and the refined oil market supervision platform.

[0024] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A data acquisition device based on digital signal level detection of a fuel dispenser display screen, characterized in that, The system comprises a hardware layer, a signal processing layer, a data application layer, and a data output and communication module. The hardware layer includes a display pin acquisition unit, a flexible circuit board connector, and a power management module. The flexible circuit board connector is equipped with shielded cables and spring-adjustable elastic contact pins with a contact impedance ≤0.1Ω. The connector is compatible with 48-pin, 50-pin, 65-pin, 88-pin, 94-pin, and 132-pin display interfaces. The display pin acquisition unit uses a high-impedance parallel architecture for non-intrusive access to the display's SEG and COM driver pins. The power management module supports a wide voltage input of 9–36V. The signal processing layer includes a signal conditioning circuit, an adaptive level conversion circuit, and an anti-interference digital filter circuit. The signal conditioning circuit integrates a programmable gain amplifier. The anti-interference digital filter circuit uses a second-order low-pass filter. The circuit consists of a 12-bit analog-to-digital converter chip with a sampling rate of 1kHz and built-in 50ms sliding window mean filtering and sliding window variance analysis algorithms. The signal processing layer supports nanosecond-level synchronous sampling of up to 132 pin signals. The data application layer is equipped with a 32-bit STM32F4 series main control unit with a main frequency of 168MHz, including a segment code timing analysis unit, a driver protocol library, and an eight-segment code reconstruction unit. The driver protocol library pre-stores more than 20 timing characteristics of fuel dispenser display driver ICs. The eight-segment code reconstruction unit has a fault-tolerant data reconstruction mechanism. The main control unit has a built-in CRC-16-CCITT check algorithm with a polynomial of 0x1021. The data output and communication module is an RS485 wired and 4G / 5G wireless dual-mode pluggable hot-swappable architecture. The RS485 channel uses Modbus. The RTU protocol is used, and the wireless channel is equipped with the Y100E communication module. The transmission link uses HTTPS encryption, and the service data uses AES-128 symmetric encryption. The communication module outputs a unified JSON format data packet and supports OTA remote upgrades of the driver protocol library, filtering algorithm and anti-counterfeiting verification logic.

2. The data acquisition device based on digital signal level detection of a fuel dispenser display screen according to claim 1, characterized in that, The adaptive level conversion circuit dynamically sets a ±2% floating threshold to automatically adapt to the drive levels of different amplitude displays, such as 3.3V, 5V, and 12V.

3. The data acquisition device based on digital signal level detection of a fuel dispenser display screen according to claim 1, characterized in that, The data application layer also integrates a hardware signal fingerprint anti-counterfeiting verification unit; the hardware signal fingerprint anti-counterfeiting verification unit extracts the rising and falling edge timing features of the level signal as the signal fingerprint, and simultaneously collects the output signal of the fuel dispenser main control board to complete dual-channel cross-verification. When the signal fingerprint does not match or the difference between the two channels exceeds the threshold, a cheating anomaly alarm is generated.

4. A data acquisition method based on digital signal level detection of a fuel dispenser display screen, characterized in that, The data acquisition apparatus applied to any one of claims 1 to 3 includes the following steps: S1. The elastic contact pin is attached to the driving pin of the fuel dispenser display screen, the shielded flexible cable is connected to the hardware layer through the flexible circuit board connector, and the power module is connected to the DC power supply of the fuel dispenser. S2, The display pin acquisition unit adopts a high-impedance parallel architecture to acquire the real-time level of all SEG and COM pins in parallel. The 12-bit analog-to-digital converter chip acquires multiple raw level signals synchronously at a sampling rate of 1kHz. S3. Multiple raw level signals are automatically adjusted by a programmable gain amplifier based on the input level, and the adaptive level conversion circuit is configured with a ±2% dynamic threshold. The noise from the oil pump motor electromagnetic pulse and backlight voltage fluctuation is filtered out by using sliding window mean filtering combined with variance analysis. S4. The data application layer collects the scanning timing of the display driver pins and compares it with more than 20 driver IC features in the built-in driver protocol library to automatically match the corresponding segment code decoding rules. S5. Reconstruct the eight-segment code based on the SEG and COM level combination; if some elastic probes fail to contact, reconstruct the transaction code completely based on the remaining effective channel timing, historical sampling data and CRC check code. S6. Extract the timing characteristics of the level signal as a signal fingerprint, synchronously read the output data of the fuel dispenser main control board for cross-comparison, and upload an abnormal alarm when it is determined that there is data tampering or analog signal injection. S7. The reconstructed unit price, fuel volume, and transaction timestamp data are encapsulated into a JSON data packet after CRC-16-CCITT integrity verification; the data is automatically switched to RS485 wired Modbus RT transmission or 4G / 5G wireless HTTPS+AES-128 encrypted transmission to the cloud according to the on-site network environment.

5. A data acquisition method based on digital signal level detection of a fuel dispenser display screen according to claim 5, characterized in that, In step S7, the RS485 wired transmission uses shielded twisted-pair cable, with a transmission distance of ≤50m and a communication baud rate of 115200bps.

6. The data acquisition method based on digital signal level detection of a fuel dispenser display screen according to claim 5, characterized in that, In step S6, the cheating anomaly alarm data packet includes the original characteristics of the level signal fingerprint.

7. A data acquisition method based on digital signal level detection of a fuel dispenser display screen according to claim 5, characterized in that, The transaction data reconstructed in step S5 supports cross-verification of data from the local gas station management system, the tax control supervision cloud, and the refined oil market supervision platform.

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