Vehicle information acquisition system based on digital sensor

Abstract

The utility model relates to the technical field of data acquisition, in particular to a vehicle information acquisition system based on a digital sensor. The system comprises a digital sensor receiving module, a wheel shaft recognizer signal acquisition module, a light curtain signal acquisition module, a data acquisition chip and a data processing chip, the digital sensor receiving module is connected with a plurality of digital weighing sensors through communication interfaces and transmits acquired digital weighing sensor signals to the data acquisition chip; the axle recognizer signal acquisition module and the light curtain signal acquisition module are respectively connected with the axle recognizer and the light curtain sensor, the axle recognizer signal acquisition module and the light curtain signal acquisition module are both connected to the data acquisition chip, and the data acquisition chip is connected with the data processing chip. According to the utility model, various sensor signals are collected and are comprehensively analyzed with the data of the digital weighing sensor, so that the comprehensive collection of vehicle information is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of data acquisition, in particular to a vehicle information acquisition system based on digital sensors. Background Art

[0002] In the prior art, at present, with the continuous development of the transportation industry, the demand for accurate measurement of vehicle weight and passing time is increasing. A digital sensor is a sensor that can convert physical quantities into digital signal outputs. Multiple sensors are coordinated and used to collect and process high-speed digital sensor signals, light curtain signals, and axle identifier signals. Traditional data acquisition control systems have problems such as inaccurate measurement, susceptibility to interference, and complex data processing. In addition, compared with traditional analog weighing sensors, digital weighing sensors have higher accuracy and stability, and can provide more reliable and accurate measurement results. Therefore, using digital sensors as the main acquisition device will greatly improve the measurement accuracy and stability of the data acquisition system. However, the acquisition systems used by current digital sensors are mostly limited by sampling rates and incomplete acquisition information. A low sampling rate may cause data loss or inaccurate information. Incomplete acquisition information is bound to affect subsequent data analysis, especially when processing rapidly changing weight signals. At this stage, a vehicle information acquisition system based on digital sensors is needed. Utility Model Content

[0003] In order to solve the problems of low data sampling rate and incomplete collected information in the data acquisition system of digital sensors, the utility model provides a vehicle information acquisition system based on digital sensors, which realizes comprehensive collection of vehicle information by collecting multiple sensor signals and conducting comprehensive analysis with the data of digital weighing sensors.

[0004] The utility model provides a vehicle information collection system based on digital sensors, which adopts the following technical solutions:

[0005] A vehicle information collection system based on digital sensors, comprising:

[0006] Digital sensor receiving module, axle identifier signal acquisition module, light curtain signal acquisition module, data acquisition chip and data processing chip;

[0007] The digital sensor receiving module is connected to multiple digital weighing sensors through an RS-485 communication interface. The digital sensor receiving module transmits the collected digital weighing sensor signals to a data acquisition chip. The axle identifier signal acquisition module and the light curtain signal acquisition module are respectively connected to the axle identifier and the light curtain sensor. The axle identifier signal acquisition module and the light curtain signal acquisition module are both connected to the data acquisition chip, and the data acquisition chip is connected to a data processing chip.

[0008] Furthermore, the digital sensor receiving module includes a signal conditioning component and an RS-485 transceiver, the signal conditioning component is connected to the RS-485 communication interface, the signal conditioning component sends the data signal of the RS-485 communication interface to the RS-485 transceiver, and the output end of the RS-485 transceiver is connected to the input end of the data acquisition chip.

[0009] Furthermore, the signal conditioning component includes an amplifier and a filter, the input end of the amplifier is connected to the signal output end of the RS-485 communication interface, the amplifier is connected to the input pin of the filter through a data line, and the filter is connected to the input end of the RS-485 transceiver.

[0010] Furthermore, the wheel axle identifier signal acquisition module includes a sensor interface, a signal amplifier and a first analog-to-digital converter, the sensor interface is connected to the wheel axle identifier and the signal amplifier respectively through a data line, the signal amplifier is connected to the first analog-to-digital converter, and the digital signal of the first analog-to-digital converter is transmitted to the data acquisition chip through the IO communication interface.

[0011] Furthermore, the light curtain signal acquisition module includes an input interface, a light curtain signal conditioning circuit and a second analog-to-digital converter. The input end of the light curtain signal conditioning circuit is connected to the light curtain sensor through the input interface, the output end of the light curtain signal conditioning circuit is connected to the second analog-to-digital converter, and the output end of the second analog-to-digital converter is transmitted to the data acquisition chip through the IO communication interface.

[0012] Furthermore, the light curtain signal conditioning circuit includes a gain amplification component and a feedback component for adjusting the gain amplification component.

[0013] Furthermore, the gain amplification component includes a high-frequency amplifier, a frequency converter and an intermediate frequency amplifier, the high-frequency amplifier is connected to the input end of the intermediate frequency amplifier through the frequency converter, and the intermediate frequency amplifier transmits the signal to the input end of the second analog-to-digital converter.

[0014] Furthermore, the feedback component includes an AGC detector, a low-pass filter and a DC amplifier, the AGC detector is connected to the DC amplifier via the low-pass filter, and the DC amplifier is connected to the high-frequency amplifier and the intermediate-frequency amplifier respectively.

[0015] Furthermore, the data acquisition chip has a built-in SPL communication interface, the data acquisition chip is connected to the data processing chip via the SPL communication interface, and both the data acquisition chip and the data processing chip are connected to an external power supply via a power management chip.

[0016] Furthermore, the data processing chip is provided with an Ethernet interface, and the data processing chip is connected to a host computer via the Ethernet interface.

[0017] In summary, the utility model has the following beneficial technical effects:

[0018] 1. The utility model sets an automatic gain control module in the light curtain signal conditioning circuit, which can dynamically adjust the gain according to the strength of the input signal to improve the signal strength and signal-to-noise ratio, and is used to remove high-frequency noise and interference components in the signal. According to the automatic adjustment characteristics, it can adapt to input signals of different strengths and attenuations, thereby improving the sampling rate of the acquisition system.

[0019] 2. By connecting to the RS-485 transceiver, the signal conditioning component of the utility model can ensure that the processed signal can be stably transmitted to the data acquisition chip, and can also receive signals from the data acquisition chip, which helps to establish a stable communication link and ensure reliable data transmission. In addition, by collecting signals from sensors in multiple vehicle detections through the data acquisition chip, comprehensive collection of vehicle information can be achieved, which is helpful for subsequent data analysis. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is an overall connection diagram of a vehicle information collection system based on a digital sensor according to an embodiment of the utility model.

[0021] Figure 2 The present invention is a schematic diagram of the connection of a digital sensor receiving module in a vehicle information collection system based on a digital sensor according to an embodiment of the present invention.

[0022] Figure 3 It is a connection diagram of the axle identifier signal acquisition module of the embodiment of the utility model.

[0023] Figure 4 It is a connection diagram of the light curtain signal acquisition module of an embodiment of the utility model.

[0024] Figure 5 It is a schematic diagram of a light curtain signal conditioning circuit in a light curtain signal acquisition module of an embodiment of the utility model. DETAILED DESCRIPTION

[0025] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0026] Example 1

[0027] Reference Figure 1 , a vehicle information collection system based on a digital sensor of this embodiment includes:

[0028] Digital sensor receiving module, axle identifier signal acquisition module, light curtain signal acquisition module, data acquisition chip and data processing chip;

[0029] The digital sensor receiving module is connected to multiple digital weighing sensors through an RS-485 communication interface. The digital sensor receiving module transmits the collected digital weighing sensor signals to a data acquisition chip. The axle identifier signal acquisition module and the light curtain signal acquisition module are respectively connected to the axle identifier and the light curtain sensor. The axle identifier signal acquisition module and the light curtain signal acquisition module are both connected to the data acquisition chip, and the data acquisition chip is connected to a data processing chip.

[0030] The digital sensor receiving module includes a signal conditioning component and an RS-485 transceiver. The signal conditioning component is connected to the RS-485 communication interface. The signal conditioning component sends the data signal of the RS-485 communication interface to the RS-485 transceiver. The output end of the RS-485 transceiver is connected to the input end of the data acquisition chip.

[0031] The signal conditioning component includes an amplifier and a filter, the input end of the amplifier is connected to the signal output end of the RS-485 communication interface, the amplifier is connected to the input pin of the filter through a data line, and the filter is connected to the input end of the RS-485 transceiver.

[0032] The wheel axle identifier signal acquisition module includes a sensor interface, a signal amplifier and a first analog-to-digital converter. The sensor interface is connected to the wheel axle identifier and the signal amplifier respectively through a data line. The signal amplifier is connected to the first analog-to-digital converter. The digital signal of the first analog-to-digital converter is transmitted to the data acquisition chip through the IO communication interface.

[0033] The light curtain signal acquisition module includes an input interface, a light curtain signal conditioning circuit and a second analog-to-digital converter. The input end of the light curtain signal conditioning circuit is connected to the light curtain sensor through the input interface, the output end of the light curtain signal conditioning circuit is connected to the second analog-to-digital converter, and the output end of the second analog-to-digital converter is transmitted to the data acquisition chip through the IO communication interface.

[0034] The light curtain signal conditioning circuit includes a gain amplifying component and a feedback component for adjusting the gain amplifying component.

[0035] The gain amplification component includes a high-frequency amplifier, a frequency converter and an intermediate frequency amplifier. The high-frequency amplifier is connected to the input end of the intermediate frequency amplifier through the frequency converter, and the intermediate frequency amplifier transmits the signal to the input end of the second analog-to-digital converter.

[0036] The feedback component includes an AGC detector, a low-pass filter and a DC amplifier. The AGC detector is connected to the DC amplifier through the filter, and the DC amplifier is connected to a high-frequency amplifier and an intermediate-frequency amplifier respectively.

[0037] The data acquisition chip has a built-in SPL communication interface, the data acquisition chip is connected to the data processing chip via the SPL communication interface, and both the data acquisition chip and the data processing chip are connected to an external power supply via a power management chip.

[0038] The data processing chip is provided with an Ethernet interface, and the data processing chip is connected to a host computer via the Ethernet interface.

[0039] Specific;

[0040] like Figure 1As shown, the utility model is mainly used in vehicle information analysis systems and is the data acquisition part of the entire system, which includes a digital sensor receiving module, which is connected to multiple digital weighing sensors through an RS-485 communication interface. The RS-485 communication interface has the advantages of strong anti-interference ability and long transmission distance. The module is responsible for receiving signals from digital weighing sensors, and transmitting them to the data acquisition chip after sorting and preliminary processing. The wheel axle identifier signal acquisition module is composed of a sensor interface, a signal amplifier, and a first analog-to-digital converter. The sensor interface receives the signal of the wheel axle identifier and transmits it to the signal amplifier through a data line. The signal amplifier amplifies the weaker original signal to enhance its strength and stability. The amplified signal is then converted into a digital signal by the first analog-to-digital converter and transmitted to the data acquisition chip through the IO communication interface. The light curtain signal acquisition module is connected to the light curtain sensor to collect the signal generated by the light curtain sensor. Light curtain sensors are usually used to detect information such as the vehicle's appearance and dimensions. This module processes and converts the signal from the light curtain sensor and then transmits it to the data acquisition chip. The data acquisition chip serves as the data collection center of the entire system. It receives various data from the digital sensor receiving module, the axle identifier signal acquisition module, and the light curtain signal acquisition module, and transmits the data to the data processing chip, which integrates, caches, and performs preliminary format processing on the data to prepare for subsequent data processing. The data acquisition chip uses the ADS1278 acquisition chip, and the data processing chip uses the STM32F103 chip. In addition, the entire system is connected through the data acquisition chip. The power supply is realized through an external power supply and a power management chip. The power management chip adopts a general-purpose chip of the BQ76930 series. The data acquisition chip uploads the collected information to the data processing chip. The data processing chip is connected to the host computer through an Ethernet interface and is responsible for in-depth analysis, calculation and processing of various vehicle information data collected, including comprehensive judgment and calculation of the vehicle's weight, number of axles, size and other information through algorithms to obtain accurate vehicle detection results, and these results may be output to other systems or stored, displayed and other operations. This embodiment is the data acquisition part of the entire system, and no excessive explanation is given for data processing and analysis.

[0041] like Figure 2As shown, the above-mentioned digital sensor receiving module is described in detail. The RS-485 communication interface provides multiple digital weighing sensor output ports, and the signal conditioning component filters, amplifies and shapes the input signal. These two parts are connected through a circuit to ensure the transmission and processing of the signal. The signal processed by the signal conditioning component needs to be converted and isolated by the RS-485 transceiver to communicate with other devices on the RS-485 bus. The output of the signal conditioning circuit is connected to the input port of the RS-485 transceiver, and the output of the RS-485 transceiver is connected to the input port of the signal conditioning circuit. The RS-485 transceiver transmits the level-converted and isolated signal to the data processing chip, and the output of the RS-485 transceiver is connected to the input port of the data processing chip. The steps of connecting multiple digital weighing sensors through the RS-485 communication interface are as follows: Set the RS-485 communication parameters on the digital sensor receiving module, including baud rate, data bit, check bit and stop bit. These parameters need to match the communication parameters of the digital weighing sensor. Connect the RS-485 communication interface of the digital sensor receiving module to the bus, using twisted pair cables, including ground, data and signal line connections. Each digital load cell needs to have a unique address on the bus. By configuring the address of each digital load cell so that the digital sensor receiving module can identify and communicate with it, the instruction format and command set of the digital sensor receiving module are configured according to the communication protocol used to communicate with the digital load cell.

[0042] like Figure 3 As shown, Figure 3 The axle identifier is a signal acquisition module. The axle identifier is responsible for detecting the relevant physical quantities of the vehicle axle, such as pressure, strain or other physical parameters that can characterize the existence and characteristics of the axle, and converting them into electrical signals for output. The sensor interface acts as a bridge between the axle identifier and the subsequent circuit. When the axle identifier generates an electrical signal, the sensor interface quickly receives the signal through the data line. The original electrical signal output by the axle identifier is usually weak and difficult to process and convert directly. The received weak signal will be amplified by the signal amplifier to enhance its amplitude and energy, making the signal easier to process and transmit. The amplified signal then enters the first analog-to-digital converter. The function of the analog-to-digital converter is to convert the analog signal, i.e. the amplified axle signal, into a digital signal, because the digital signal has higher stability and anti-interference ability in transmission, processing and storage. After the first analog-to-digital converter converts the analog signal into a digital signal according to a certain quantization accuracy and sampling frequency, it transmits these digital signals to the data acquisition chip through the IO communication interface.

[0043] like Figure 4As shown, the input interface serves as a bridge between the light curtain sensor and the subsequent circuits, receiving the electrical signal from the light curtain sensor. The electrical signal is processed and adjusted by the light curtain signal conditioning circuit to optimize the signal quality and make it more suitable for subsequent analog-to-digital conversion. The light curtain signal conditioning circuit, such as Figure 5 As shown, the high-frequency amplifier plays the role of preamplification. It and the intermediate-frequency amplifier are directly controlled gain-controllable amplifiers and are the controlled objects of the AGC control loop. The AGC detector, low-pass filter and DC amplifier form the feedback component and play the role of feedback. Indicates the reference voltage of the input signal. This is the reference level of the input signal, which is used to determine the reference value of the signal, that is, the voltage level when there is no signal input. The input end receives the output signal of the light curtain signal sensor. After high-frequency amplification, frequency conversion and intermediate-frequency amplification, the intermediate-frequency amplitude modulated wave is obtained. , After passing through the AGC detector and low-pass filter, a DC component reflecting the change trend of the input signal is obtained, and then the AGC voltage is obtained after DC amplification. , when the input signal is strong, Big, otherwise Small, use AGC voltage to control the gain of high or medium amplifier, Low gain when large The smaller the value, the higher the gain, thus achieving the purpose of automatic gain control.

[0044] The above are all preferred embodiments of the present utility model, and are not intended to limit the protection scope of the present utility model. Therefore, any equivalent changes made based on the structure, shape, and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A vehicle information collection system based on digital sensors, characterized in that: include: Digital sensor receiving module, axle identifier signal acquisition module, light curtain signal acquisition module, data acquisition chip and data processing chip; The digital sensor receiving module is connected to multiple digital weighing sensors through an RS-485 communication interface. The digital sensor receiving module transmits the collected digital weighing sensor signals to a data acquisition chip. The axle identifier signal acquisition module and the light curtain signal acquisition module are respectively connected to the axle identifier and the light curtain sensor. The axle identifier signal acquisition module and the light curtain signal acquisition module are both connected to the data acquisition chip, and the data acquisition chip is connected to a data processing chip.

2. A vehicle information collection system based on digital sensors according to claim 1, characterized in that: The digital sensor receiving module includes a signal conditioning component and an RS-485 transceiver. The signal conditioning component is connected to the RS-485 communication interface. The signal conditioning component sends the data signal of the RS-485 communication interface to the RS-485 transceiver. The output end of the RS-485 transceiver is connected to the input end of the data acquisition chip.

3. A vehicle information collection system based on digital sensors according to claim 2, characterized in that: The signal conditioning component includes an amplifier and a filter, the input end of the amplifier is connected to the signal output end of the RS-485 communication interface, the amplifier is connected to the input pin of the filter through a data line, and the filter is connected to the input end of the RS-485 transceiver.

4. The vehicle information collection system based on digital sensors according to claim 1 is characterized in that: The wheel axle identifier signal acquisition module includes a sensor interface, a signal amplifier and a first analog-to-digital converter. The sensor interface is connected to the wheel axle identifier and the signal amplifier respectively through a data line. The signal amplifier is connected to the first analog-to-digital converter. The digital signal of the first analog-to-digital converter is transmitted to the data acquisition chip through the IO communication interface.

5. The vehicle information collection system based on digital sensors according to claim 1 is characterized in that: The light curtain signal acquisition module includes an input interface, a light curtain signal conditioning circuit and a second analog-to-digital converter. The input end of the light curtain signal conditioning circuit is connected to the light curtain sensor through the input interface, the output end of the light curtain signal conditioning circuit is connected to the second analog-to-digital converter, and the output end of the second analog-to-digital converter is transmitted to the data acquisition chip through the IO communication interface.

6. A vehicle information collection system based on digital sensors according to claim 5, characterized in that: The light curtain signal conditioning circuit includes a gain amplifying component and a feedback component for adjusting the gain amplifying component.

7. A vehicle information collection system based on digital sensors according to claim 6, characterized in that: The gain amplification component includes a high-frequency amplifier, a frequency converter and an intermediate frequency amplifier. The high-frequency amplifier is connected to the input end of the intermediate frequency amplifier through the frequency converter, and the intermediate frequency amplifier transmits the signal to the input end of the second analog-to-digital converter.

8. The vehicle information collection system based on digital sensors according to claim 7 is characterized in that: The feedback component includes an AGC detector, a low-pass filter and a DC amplifier. The AGC detector is connected to the DC amplifier through the low-pass filter, and the DC amplifier is connected to a high-frequency amplifier and an intermediate-frequency amplifier respectively.

9. The vehicle information collection system based on digital sensors according to claim 1, characterized in that: The data acquisition chip has a built-in SPL communication interface, the data acquisition chip is connected to the data processing chip via the SPL communication interface, and both the data acquisition chip and the data processing chip are connected to an external power supply via a power management chip.

10. The vehicle information collection system based on digital sensors according to claim 1, characterized in that: The data processing chip is provided with an Ethernet interface, and the data processing chip is connected to a host computer via the Ethernet interface.

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