CN102566542B - Motor vehicle load safety monitoring system and method thereof - Google Patents
Motor vehicle load safety monitoring system and method thereof Download PDFInfo
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Abstract
The invention discloses a motor vehicle load safety monitoring system and a method thereof, and the system includes a sensor and a load information processing platform, wherein the sensor is mounted at a connection part between a vehicle body bearing axle and a vibration damping steel sheet, is used for sensing the vehicle load in a preset acquisition period, and outputs the digital information to the load information processing platform after amplifying, filtering and digitally converting the sensed simulation information in a wireless manner; furthermore, the load information processing platform receives the digital information output by the sensor, performs data processing, acquires the motor vehicle load, and triggers a warning after confirming that the motor vehicle load exceeds the preset load threshold value. By using the motor vehicle load safety monitoring system and the method thereof, the cost for detecting an overload is reduced, and the reliability of motor vehicle driving is improved.
Description
Technical Field
The invention relates to a safety monitoring technology, in particular to a system and a method for monitoring load safety of a motor vehicle.
Background
According to statistics, overload is a main factor of road traffic accidents of motor vehicles. When the vehicle body exceeds the load of the motor vehicle, the driving route of the motor vehicle is difficult to control accurately, and the driving reliability is low, so that hidden dangers are buried for road traffic accidents; furthermore, when the motor vehicle turns, the stress on the vehicle body can be unbalanced, and when the unbalance exceeds a certain threshold value, the vehicle body can turn over; moreover, overloading of motor vehicles will cause severe damage to roads and bridges.
At present, for the overload of the motor vehicle, a static wagon balance detection method is mainly adopted, namely the total weight of the motor vehicle is weighed, the weight of the motor vehicle is subtracted, the load of the motor vehicle is obtained, and if the obtained load exceeds the rated load of the motor vehicle, the overload of the motor vehicle is determined. However, the wagon balance set by the method is high in cost and is influenced by the geographical position, the motor vehicle needs to run to the position where the wagon balance is set to be detected, so that whether the loaded load is overloaded or not can not be determined when the motor vehicle is initially loaded with the load, and a road traffic accident can be caused before the motor vehicle runs to the position where the wagon balance is set. At present, no effective method is available for dynamically monitoring overload of a motor vehicle in real time during initial loading and driving.
Disclosure of Invention
In view of the above, the main objective of the present invention is to provide a load safety monitoring system for a motor vehicle, which reduces the cost of detecting overload and improves the reliability of motor vehicle driving.
The invention also aims to provide a load safety monitoring method for the motor vehicle, which reduces the cost of detecting overload and improves the running reliability of the motor vehicle.
In order to achieve the above object, the present invention provides a load safety monitoring system for a motor vehicle, the system comprising: a sensor and a load information processing platform, wherein,
the sensor is arranged at the joint of the vehicle body bearing wheel shaft and the vibration reduction steel plate, senses the vehicle body load in a preset acquisition period, amplifies, filters and digitally converts sensed analog information, and outputs digital information to the load information processing platform in a wireless mode;
and the load information processing platform receives the digital information output by the sensor, performs data processing to obtain the motor vehicle load, and triggers an alarm after determining that the motor vehicle load exceeds a preset load threshold.
Further comprising:
and the remote monitoring center is used for receiving the alarm information sent by the load information processing platform in a wireless mode, storing and analyzing the alarm information.
The load information processing platform is further used for storing license plate number information of the motor vehicle and carrying the license plate number information of the motor vehicle when outputting alarm information to the remote monitoring center.
The load information processing platform is further used for acquiring the GPS information of the motor vehicle and carrying the GPS information when outputting the alarm information to the remote monitoring center.
The sensor includes: a sensitive element unit, a data processing unit, a communication unit and a power supply unit, wherein,
the sensing element unit is used for sensing the vehicle body load and outputting sensed analog information to the data processing unit;
the data processing unit is used for receiving the analog information output by the sensitive element unit, amplifying, filtering and performing digital conversion processing on the analog information and outputting the analog information to the communication unit;
the communication unit is used for sending the digital information output by the data processing unit;
and the power supply unit is used for providing working voltage for the sensitive element unit, the data processing unit and the communication unit.
The communication unit is further used for receiving the acquisition instruction output by the load information processing platform and outputting the acquisition instruction to the sensitive element unit;
and the sensitive element unit enters a working state according to the acquisition instruction, senses the load of the vehicle body and puts the sensitive element unit in a dormant state after the acquisition is finished.
The sensor further comprises:
and the digital signal processor is connected with the power supply unit through the integrated circuit interface circuit or the universal asynchronous receiver/transmitter interface, monitors the voltage of the power supply unit, and informs the load information processing platform when the voltage of the power supply unit is lower than a preset voltage threshold value.
The load information processing platform comprises: an interface display unit, a GPS positioning unit, a first communication unit, a second communication unit, a data processing unit and a power supply unit, wherein,
the interface display unit is used for displaying the installation position information of the sensor on the motor vehicle, and displaying the alarm information output by the data processing unit and the sensor installation position information corresponding to the alarm information;
the GPS positioning unit is used for acquiring GPS information of the motor vehicle and outputting the information to the data processing unit;
the first communication unit is used for receiving the digital information output by the sensor communication unit and outputting the digital information to the data processing unit;
the second communication unit is used for sending the information output by the data processing unit to the remote monitoring center;
the data processing unit is used for receiving the digital information output by the sensor, processing the data to obtain the load of the motor vehicle, and outputting alarm information and sensor installation position information corresponding to the alarm information to the interface display unit after determining that the load of the motor vehicle exceeds a preset load threshold; receiving GPS information output by the GPS positioning unit, carrying the GPS information in the alarm information, and outputting the alarm information to the second communication unit;
and the power supply unit is used for providing voltage required by work for the interface display unit, the GPS positioning unit, the first communication unit, the second communication unit and the data processing unit.
A method of load safety monitoring for a motor vehicle, the method comprising:
a sensor arranged at the joint of a vehicle body bearing wheel shaft and a vibration reduction steel plate senses the load of a vehicle body, amplifies, filters and digitally converts sensed analog information in a preset acquisition period, and then outputs digital information to a load information processing platform in a wireless mode;
and the load information processing platform receives the digital information output by the sensor, performs data processing to obtain the motor vehicle load, and triggers an alarm after determining that the motor vehicle load exceeds a preset load threshold.
The sensor installed at the joint of the vehicle body bearing wheel shaft and the damping steel plate comprises:
a sensor arranged at the central position of the vehicle body at the joint of the vehicle body bearing wheel shaft and the vibration reduction steel plate, and,
and the sensors are arranged at the positions of two sides of the connecting part of the vehicle body bearing wheel shaft and the vibration reduction steel plate, which are symmetrical to the center of the vehicle body.
The triggering alarm comprises:
generating alarm information, and displaying the alarm information and sensor installation position information corresponding to the alarm information on a display panel of the load information processing platform; and/or the presence of a gas in the gas,
generating alarm information, and sending the alarm information and sensor installation position information corresponding to the alarm information to a preset remote monitoring center through a wireless network; and/or the presence of a gas in the gas,
and performing sound-light alarm on the measuring point corresponding to the sensor exceeding the load threshold.
The load information processing platform establishes a mapping relation between a sensor identifier and a sensor installation position in advance, sets a load threshold corresponding to the installation position for each sensor of the installation position, performs data processing to obtain a motor vehicle load, and after determining that the motor vehicle load exceeds the preset load threshold, the load information processing platform comprises:
receiving digital information output by each sensor in an acquisition period;
determining the load corresponding to the digital information of the sensor according to the performance parameters of the sensor, and taking the load as the load of the motor vehicle;
and inquiring and acquiring the sensor load threshold according to the sensor identification, and if the motor vehicle load corresponding to the sensor digital information exceeds the corresponding load threshold of the sensor, determining that the motor vehicle load exceeds the preset load threshold.
The motor vehicle load comprises: measuring point single load, measuring point average load and comprehensive average load.
According to the technical scheme, the invention provides a system and a method for monitoring the load safety of a motor vehicle, wherein the system comprises: the sensor is arranged at the joint of a vehicle body bearing wheel shaft and the vibration reduction steel plate, senses the vehicle body load in a preset acquisition period, amplifies, filters and digitally converts sensed analog information, and outputs digital information to the load information processing platform in a wireless mode; and the load information processing platform receives the digital information output by the sensor, performs data processing to obtain the motor vehicle load, and triggers an alarm after determining that the motor vehicle load exceeds a preset load threshold. Therefore, the common sensor is used for carrying out load safety monitoring, the cost is low, and the overload detection cost can be effectively reduced; furthermore, the sensor is not affected by the geographical position, is convenient to install, can acquire the load information of the motor vehicle in real time, outputs an alarm when the motor vehicle is overloaded, is convenient to take measures in time, and can effectively prevent the motor vehicle from being overloaded, thereby avoiding the damage of the overload to the road and improving the running reliability of the motor vehicle.
Drawings
Fig. 1 is a schematic structural diagram of a load safety monitoring system of a motor vehicle according to an embodiment of the invention.
Fig. 2 is a schematic view of the mounting structure of the sensor on the motor vehicle according to the embodiment of the invention.
Fig. 3 is a schematic structural diagram of a sensor according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a load information processing platform according to an embodiment of the present invention.
Fig. 5 is a schematic flow chart of a method for monitoring load safety of a motor vehicle according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The existing method for detecting the overload of the motor vehicle through the wagon balance has the disadvantages that the cost of the wagon balance is high, the wagon balance is influenced by the geographical position, and the requirement for monitoring the motor vehicle in real time cannot be met.
The Wireless Sensor Network (WSN) based on the technology of the Internet of things is a Wireless Network formed by a large number of static or mobile sensors in a self-organizing manner, and the sensors are used for sensing, collecting and processing information of a monitored object in a monitoring area of the Wireless Sensor Network and sending the information to a user or a remote monitoring center through the Wireless Network, so that the user or the remote monitoring center can carry out statistics and analysis according to received data information, and the running state information of the monitored object can be obtained to realize monitoring. The sensor can transmit the acquired data in real time, has the characteristics of quick construction and convenient deployment, and is not easily limited by the monitoring environment, so the sensor has better application in the fields of environment monitoring, urban traffic management, medical monitoring, warehousing management, automobile electronics and the like.
In the embodiment of the invention, the wireless sensor network technology is considered to be applied to the load safety monitoring of the motor vehicle, a sensor is arranged at the joint of a vehicle body bearing wheel shaft and a vibration reduction steel plate and is used for acquiring vehicle body load information in real time to monitor the safety state of the motor vehicle, the acquired load information is wirelessly transmitted to a load information processing platform, the load information processing platform carries out data processing on the received load information of each measuring point of the vehicle body, whether the motor vehicle is overloaded or not, whether the vehicle body is unbalanced or not and whether each measuring point exceeds a value or not are judged through a vehicle body judging algorithm, and if the abnormal value occurs, alarm information is sent out, so that accidents caused by motor vehicle overload, unbalance and the like and damage of.
Fig. 1 is a schematic structural diagram of a load safety monitoring system of a motor vehicle according to an embodiment of the invention. Referring to fig. 1, the system includes: a sensor and a load information processing platform, the sensor is connected to the load information processing platform through a wireless network or a wired mode, wherein,
the sensor is arranged at the joint of the vehicle body bearing wheel shaft and the vibration reduction steel plate, senses the vehicle body load in a preset acquisition period, amplifies, filters and digitally converts sensed analog information, and outputs digital information to the load information processing platform in a wireless mode;
in the embodiment of the invention, the sensor has low cost and convenient installation relative to the wagon balance, and can effectively reduce the overload detection cost.
The sensor may be a force sensor, a strain sensor, or the like.
Preferably, the number of the sensors arranged at the connecting position can be multiple, each sensor corresponds to a measuring point, the sensors are respectively positioned at the center position of the vehicle body at the connecting position of the vehicle body bearing wheel shaft and the vibration reduction steel plate and used for sensing the central load of the vehicle body, the positions of the two sides of the connecting position of the vehicle body bearing wheel shaft and the vibration reduction steel plate, which are symmetrical to the center of the vehicle body, are used for sensing the loads of the two sides of the vehicle body of the motor vehicle at the turning position, and each sensor is respectively connected to the load information processing platform through a wireless.
The sensor can directly detect in a mode of arranging strain gauges at measuring points or in a mode of installing a bridge path integrated with the strain gauges.
And the load information processing platform receives the digital information output by the sensor, performs data processing to obtain the motor vehicle load, and triggers an alarm after determining that the motor vehicle load exceeds a preset load threshold.
In the embodiment of the invention, the load information processing platform can be arranged in a cab of the motor vehicle.
As described above, if there are a plurality of sensors installed at the connection, the load information processing platform further sets a sensor identifier for the installed sensor and outputs the sensor identifier to the sensor, establishes a mapping relationship between the sensor identifier and the installation position of the sensor, and sets a load threshold corresponding to each position for the sensor at the position.
The triggering alarm can be that alarm information is generated, the alarm information and sensor installation position information corresponding to the alarm information are displayed on a display panel of a load information processing platform so that a driver of a motor vehicle can know overload information and take corresponding measures in real time to avoid overload, or the generated alarm information and the sensor installation position information corresponding to the alarm information are sent to a preset remote monitoring center through a wireless network so that the remote monitoring center records relevant overload information, monitors the motor vehicle and takes corresponding processing measures.
Further, the load information processing platform stores license plate number information of the motor vehicle in advance, and carries the license plate number information of the motor vehicle when outputting alarm information to the remote monitoring center.
In practical application, the load information processing platform is further configured to obtain Global Positioning System (GPS) information of the motor vehicle, and when outputting the warning information to the remote monitoring center, the load information processing platform carries the GPS information.
The system further comprises:
and the remote monitoring center is used for receiving the alarm information, the geographic position and the license plate number sent by the load information processing platform in a wireless mode, storing and analyzing.
Fig. 2 is a schematic view of the mounting structure of the sensor on the motor vehicle according to the embodiment of the invention. Referring to fig. 2, under the chassis of the body of the motor vehicle, there is a damping steel plate for bearing the load of the body, the damping steel plate is disposed on the bearing axle of the body, the bearing is mounted at the center of the wheel, and the sensor is mounted at the joint of the bearing axle of the body and the damping steel plate.
Fig. 3 is a schematic structural diagram of a sensor according to an embodiment of the present invention. Referring to fig. 3, the sensor includes: a sensitive element unit, a data processing unit, a communication unit and a power supply unit, wherein,
the sensing element unit is used for sensing the vehicle body load and outputting sensed analog information to the data processing unit;
in the embodiment of the invention, the sensitive element unit can sensitively sense the measured variable (vehicle body load) and respond.
The data processing unit is used for receiving the analog information output by the sensitive element unit, amplifying, filtering and performing digital conversion processing on the analog information and outputting the analog information to the communication unit;
in the embodiment of the invention, the data processing unit mainly collects and processes the digital information (load information) measured by the sensitive element unit, such as amplification, filtering and digital conversion processing, and sends the processed digital information to the load information processing platform through the communication unit.
The communication unit is used for sending the digital information output by the data processing unit;
in the embodiment of the invention, the communication unit adopts an 802.15.4 protocol to carry out wireless data transmission.
In practical application, the sensor does not need to be in a working state all the time, senses and acquires analog information, and in order to reduce the power consumption of the sensor, the communication unit is preferably further used for receiving an acquisition instruction output by the load information processing platform and outputting the acquisition instruction to the sensitive element unit;
in the embodiment of the present invention, the communication unit receives the acquisition instruction issued by the load information processing platform, for example, the acquisition start instruction, the acquisition stop instruction, the sampling rate setting instruction, the sensor group number instruction, and the channel number instruction, and outputs the acquisition start instruction, the acquisition stop instruction, the sampling rate setting instruction, the sensor group number instruction, and the channel number instruction to the sensing element unit, so that the sensing element unit performs corresponding operations according to the acquisition instruction.
And the sensitive element unit enters a working state according to the acquisition instruction, senses the load of the vehicle body and puts the sensitive element unit in a dormant state after the acquisition is finished.
Wherein, the communication unit includes: a power amplifier and a radio frequency antenna (not shown).
In the embodiment of the present invention, the power amplifier is used to solve the long-distance transmission problem, and includes an rf power amplifier on the transmit channel, for example, HFA3925, and a low noise amplifier on the receive channel, for example, HFA 3424. The radio frequency power amplifier HFA3925 is used for realizing the power amplification function of a 2.4GHz transmitted signal, the maximum amplification gain can reach 28dB, and the maximum output power can reach 250 mW; the low noise amplifier HFA3424 is used for realizing the low noise amplification function of the 2.4GHz received signal, and the amplification gain can reach 14 dB.
In the embodiment of the present invention, a system chip integrating a data processing unit and a communication unit may be used, for example, the CC2430 implements data processing and transmission functions, and the system chip CC2430 includes a high performance 2.4GHz Direct Sequence Spread Spectrum (DSSS) radio frequency transceiver and an industrial-grade small and efficient 8051 controller. Therefore, the processing performance can be improved, and the requirements of ZigBee-based 2.4GHz ISM band application on low cost and low power consumption can be met.
The CC2430 design combines 8Kbyte RAM and powerful peripheral modules, has a size of only 7 × 7mm 48-pin package, adopts 0.18& micro CMOS standard technology with embedded flash memory, can realize digital baseband processor, Radio Frequency (RF), analog circuit and system memory, and integrates these functions on the same silicon wafer.
The CC2430 contains an enhanced industry standard 8-bit 8051 controller, running clock 32MHz, for the requirements of the protocol stack, network, and application software execution on MCU processing power. The CC2430 enhanced 8051 core using the standard 8051 instruction set has 8 times the performance of the standard 8051 core due to faster execution times and by eliminating wasted bus state.
The CC2430 also integrates peripherals for user-defined applications. In CC2430, an enhanced data Encryption protocol (AES) coprocessor is integrated to support the operation of (128-bit key) AES required for ieee802.15.4mac security to achieve as little microcontroller occupation as possible.
And the power supply unit is used for providing working voltage for the sensitive element unit, the data processing unit and the communication unit.
In the embodiment of the invention, the power supply unit can be a battery, is used for supplying power to active devices in the system and can also carry out charging and discharging management on the battery.
Preferably, the power supply unit can respectively adopt independent power supply management to the sensitive element unit, the data processing unit and the communication unit of the system, and the power supply unit enters a dormant state or turns off the power supply when the power supply unit is idle, so that the total power consumption of the system is greatly reduced.
Further, the sensor further includes a digital signal processor (not shown in the figure), and is connected to the power supply unit through an Integrated Circuit Interface Circuit (IIC) or a Universal Asynchronous Receiver Transmitter (UART) Interface, so as to implement real-time monitoring of the voltage, current and temperature conditions of the power supply unit, prevent the occurrence of the power supply overcharge and undervoltage phenomena, and notify the load information processing platform to replace the battery and charge the battery in time when the voltage of the power supply unit is lower than a preset voltage threshold.
Fig. 4 is a schematic structural diagram of a load information processing platform according to an embodiment of the present invention. Referring to fig. 4, the payload information processing platform includes: an interface display unit, a GPS positioning unit, a first communication unit, a second communication unit, a data processing unit and a power supply unit, wherein,
the interface display unit is used for displaying the installation position information of the sensor on the motor vehicle, and displaying the alarm information output by the data processing unit and the sensor installation position information corresponding to the alarm information;
in the embodiment of the invention, the interface display unit is also used for setting an acquisition command, and is a display panel for displaying a switch key, a measuring point layout diagram, measuring point data, measuring point acousto-optic alarm, threshold setting and related monitoring command setting on the load information processing platform.
The GPS positioning unit is used for acquiring GPS information of the motor vehicle and outputting the information to the data processing unit;
in the embodiment of the invention, the GPS can realize real-time navigation and positioning in the global range and consists of three parts, namely a space satellite, a ground control system and user equipment.
The basic positioning principle of the GPS is: each GPS satellite distributes the position and time data signal at any moment, the user receiver can measure the time delay from each satellite signal to the receiver, and the distance from the receiver to different satellites can be calculated according to the signal transmission speed. When data is collected for at least 4 satellites simultaneously, three-dimensional coordinates, velocity, and time can be calculated.
Because GPS has the characteristics of global coverage, high precision, high positioning speed, good real-time performance, strong anti-interference capability and the like, the GPS is widely applied at home and abroad in recent years, plays a great role in various fields and becomes an impossible or lacking part of the information era.
In the embodiment of the invention, a GSU-38A0GPS module is used. Its advantages are small size, simple interface, high reliability and use in DSP, ARM and single-chip computer system. By inputting the input voltage 5V into the fixed power output chip LT1085, a voltage of 3.3V is output to the GSU-38A0GPS module chip.
The GSU-38A0GPS module is provided with 12 data parallel receiving channels, comprising 8 data bits, 1 start bit, 1 stop bit and no correction bit, the output level is CMOS level and the current is 1 mA. The communication mode adopts asynchronous serial communication, the default communication speed is 4800baud, the receiving frequency is 1575.42 +/-1.0 MHz, and the L1 waveband C/A code.
The GSU-38A0GPS module may provide longitude, latitude, speed, altitude, world coordinated time, frequency, and GPS satellite orbit information, among others. It is characterized in that: the low voltage is 3.3V for power supply; the working current is not higher than 50mA (no antenna consumption is contained); high sensitivity-145 dBm; the minimum unit of time that can be output is 0.01 seconds.
The GSU-38A0GPS module has 8M flash memory, the Information format can be NMEA-0183 or Binary, American Standard Code for Information Interchange (ASCII) code is adopted, the center frequency of an attached antenna is 1575.42MHz, the right-handed polarization is realized, the gain is more than or equal to-5 dB, and the axis ratio is 3 dB.
The first communication unit is used for receiving the digital information output by the sensor communication unit and outputting the digital information to the data processing unit;
the second communication unit is used for sending the information output by the data processing unit to the remote monitoring center;
in the embodiment of the present invention, the second communication unit sends the related data in the load information processing platform to the remote monitoring center through a General Packet Radio Service (GPRS) network.
GPRS is a wireless packet switching technology based on GSM system, provides end-to-end and wide area wireless IP connection, and has the advantages of real-time online, volume charging, fast login, high-speed transmission and free switching. The transmission speed of the current GSM mobile communication network is 9.6 Kbytes per second, and the transmission speed of a GPRS mobile phone can reach 115 Kbps.
The GPRS transmits data in a packet switching mode, so that the utilization rate of network resources is greatly improved compared with circuit switching, the GPRS can transmit voice and data simultaneously, and charging can be completely counted according to generated flow.
The data processing unit is used for receiving the digital information output by the sensor, processing the data to obtain the load of the motor vehicle, and outputting alarm information and sensor installation position information corresponding to the alarm information to the interface display unit after determining that the load of the motor vehicle exceeds a preset load threshold; receiving GPS information output by the GPS positioning unit, carrying the GPS information in the alarm information, and outputting the alarm information to the second communication unit;
in the embodiment of the invention, the data processing unit can also carry the license plate number information of the motor vehicle when outputting the alarm information to the remote monitoring center. Preferably, the data processing unit adopts AT89S52 of Atmel company to acquire data of the GPS positioning unit and the first communication unit, performs data processing on the digital information according to the performance parameters of the sensor for sending the digital information, converts the digital information into corresponding vehicle body load information, displays the processing result through the panel display unit through a preset internal vehicle body distinguishing algorithm, and sends the processing result to the remote monitoring center through the second communication unit.
The AT89S52 is a low-power-consumption and high-performance CMOS 8-bit microcontroller, has an 8K in-system programmable Flash memory, is manufactured by adopting an Atmel high-density nonvolatile memory technology, and is completely compatible with industrial 80C51 product instructions and pins, so that the AT89S52 provides a high-flexibility and ultra-effective solution for a plurality of embedded control application systems.
In addition, AT89S52 can operate down to 0Hz static logic, supporting 2 software selectable power saving modes. In the idle mode, the CPU stops working and allows the RAM, the timer/counter, the serial port and the interrupt to continue working; under the power-down protection mode, the RAM content is stored, the oscillator is frozen, and all work of the single chip microcomputer is stopped until the next interruption or hardware reset.
The following explains the vehicle body discrimination algorithm.
The vehicle body discrimination algorithm mainly processes the data of each measuring point to judge:
(1) a measure point exceeding a load threshold;
(2) vehicle body overload;
(3) vehicle body unbalance, left deviation or right deviation;
the algorithm is described as follows:
a total of 4 stations A, B, C, D are provided, with an acquisition period of t.
The sensor measures data (simulated load information) of each measuring point:
a1, a 2.., An; b1, B2.., Bn; c1, C2.., Cn; d1, D2. n is a natural number.
Acquiring a load threshold of each measuring point according to a monitored vehicle type, wherein the load threshold of each measuring point can be obtained by a finite element method, an actual experiment test or a vehicle design company according to the vehicle type of the vehicle, a vehicle body rated load and a measuring point position, and the load thresholds of the measuring point A, B, C, D are respectively Fa, Fb, Fc and Fd:
if An is more than or equal to Fa or Bn is more than or equal to Fb or Cn is more than or equal to Fc or Dn is more than or equal to Fd, alarm information is sent out.
Of course, in practical application, the average value of the data of each measuring point can be calculated in the acquisition period t
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Or
Or
An alarm message is sent.
The vehicle body average load threshold F can be calculated according to the vehicle type of the motor vehicle:
in the acquisition period t, the total average value of the vehicle body load is calculated according to the average value of each measuring point
If it is not
An alarm message is sent.
And the load information processing platform displays the load value of each measuring point and further performs sound-light alarm on the measuring points exceeding the load threshold, namely triggering the alarm to send the sound-light alarm.
And the power supply unit is used for providing voltage required by work for the interface display unit, the GPS positioning unit, the first communication unit, the second communication unit and the data processing unit.
In the above examples, the GPS positioning unit and the second communication unit are not essential units for implementing the present invention.
Fig. 5 is a schematic flow chart of a method for monitoring load safety of a motor vehicle according to an embodiment of the invention. With reference to figure 5 of the drawings,
in this step, install the sensor that bears the weight of the shaft and the damping steel sheet junction at the automobile body and include:
a sensor arranged at the central position of the vehicle body at the joint of the vehicle body bearing wheel shaft and the vibration reduction steel plate, and,
and the sensors are arranged at the positions of two sides of the connecting part of the vehicle body bearing wheel shaft and the vibration reduction steel plate, which are symmetrical to the center of the vehicle body.
Preferably, when the sensor processes the sensed analog information and outputs the processed analog information, the processed digital information carries a preset sensor identifier.
Further, when the preset acquisition cycle time is up, the sensor is put into a dormant state, monitors an acquisition command from the load information processing platform, and enters an acquisition state after receiving the acquisition command.
And 502, receiving the digital information output by the sensor by the load information processing platform, processing data, acquiring the load of the motor vehicle, and triggering an alarm after determining that the load of the motor vehicle exceeds a preset load threshold value.
In this step, the load information processing platform is installed in a cab of the motor vehicle.
Further, the load information processing platform establishes a mapping relationship between the sensor identifier and the sensor installation position in advance, and sets a load threshold corresponding to the installation position for each sensor of the installation position, and then performs data processing to obtain the motor vehicle load, and after determining that the motor vehicle load exceeds the preset load threshold, the method includes:
receiving digital information output by each sensor in an acquisition period;
determining the load corresponding to the digital information of the sensor according to the performance parameters of the sensor, and taking the load as the load of the motor vehicle;
in this step, the digital information amount is proportional to the magnitude of the load of the motor vehicle, and the load corresponding to the analog information of the sensor is determined according to the performance parameter of the sensor, for example, the amplification factor.
In practical application, the motor vehicle load comprises: measuring point single load, measuring point average load and comprehensive average load.
Each sensor corresponds to a measuring point, and the analog information sensed by the measuring point with the measuring point number A is set as AiWherein, i is a natural number, then:
measure a point single load of Ai；
Average load of measuring point
The calculation formula of (2) is as follows:
in the formula, n is the number of times of collection in the collection period.
Integrated average load
The calculation formula of (2) is as follows:
in the formula, k is the number of measuring points;
the average load of the measuring point of the jth measuring point is shown.
And inquiring and acquiring the sensor load threshold according to the sensor identification, and if the load corresponding to the sensor simulation information exceeds the sensor load threshold, determining that the motor vehicle load exceeds a preset load threshold.
In the step, if the load sensed by a sensor arranged at the center of the vehicle body at the joint of the vehicle body bearing wheel shaft and the vibration reduction steel plate is overloaded, the overload of the vehicle body is indicated; if the load sensed by the sensors arranged at the connecting part of the vehicle body bearing wheel shaft and the vibration reduction steel plate and the two sides of the vehicle body which are symmetrical to the center of the vehicle body is overloaded, the vehicle body is unbalanced.
The load corresponding to the sensor simulation information exceeding the sensor load threshold comprises:
Ai≥Faor is or
In the formula,
Faa single load threshold value is measured;
the average load threshold value of the measuring points is taken;
In the above formula, Fa、
And
the method can be obtained by a finite element method, an actual experiment test or a motor vehicle design company according to the type of the motor vehicle, the rated load of the vehicle body and the position of a measuring point.
Triggering an alarm comprises:
generating alarm information, and displaying the alarm information and sensor installation position information corresponding to the alarm information on a display panel of the load information processing platform; and/or the presence of a gas in the gas,
generating alarm information, and sending the alarm information and sensor installation position information corresponding to the alarm information to a preset remote monitoring center through a wireless network; and/or the presence of a gas in the gas,
and performing sound-light alarm on the measuring point corresponding to the sensor exceeding the load threshold.
Further, the method further comprises:
the load information processing platform stores license plate number information of the motor vehicle in advance, and carries the license plate number information of the motor vehicle when outputting alarm information to the remote monitoring center.
The method may further comprise:
and acquiring the GPS information of the motor vehicle, and carrying the GPS information when outputting the alarm information to the remote monitoring center.
Of course, in practical application, the method may further include:
the load information processing platform receives an acquisition command input by a user and outputs the acquisition command to the sensor so that the sensor acquires analog information according to the acquisition command.
The acquisition command includes: a start acquisition instruction, a stop acquisition instruction, a sampling rate setting instruction, a sensor group number instruction, and a channel number instruction.
According to the system and the method for monitoring the load safety of the motor vehicle, the sensor is arranged at the joint of the vehicle body bearing wheel shaft and the vibration reduction steel plate to sense the load of the vehicle body, and after the sensed analog information is amplified, filtered and digitally converted, the digital information is output to the load information processing platform in a wireless mode; and the load information processing platform performs data processing to obtain the motor vehicle load, and triggers an alarm after determining that the motor vehicle load exceeds a preset load threshold. Therefore, the common sensor is used for carrying out load safety monitoring, the cost is low, the installation is convenient, and the overload detection cost can be effectively reduced; furthermore, the sensor is not affected by the geographical position, can acquire the load information of the motor vehicle in real time, and outputs an alarm when the motor vehicle is overloaded, so that measures can be taken conveniently in time, and the motor vehicle can be effectively prevented from being overloaded, thereby avoiding the damage of the overload to the road and improving the running reliability of the motor vehicle; and the sensors are flexibly installed and can be arranged at the positions of two sides of the central symmetry of the vehicle body to sense the loads of the vehicle body at the turning positions, so that accidents caused by unbalance of the vehicle and the like can be effectively prevented.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A motor vehicle load safety monitoring system, comprising: a sensor, a load information processing platform and a remote monitoring center, wherein,
the sensor is arranged at the joint of the vehicle body bearing wheel shaft and the vibration reduction steel plate, senses the vehicle body load in a preset acquisition period, amplifies, filters and digitally converts sensed analog information, and outputs digital information to the load information processing platform in a wireless mode;
the sensor includes: a sensitive element unit, a data processing unit, a communication unit and a power supply unit, wherein,
the sensing element unit is used for sensing the vehicle body load and outputting sensed analog information to the data processing unit;
the data processing unit is used for receiving the analog information output by the sensitive element unit, amplifying, filtering and performing digital conversion processing on the analog information and outputting the analog information to the communication unit;
the communication unit is used for sending the digital information output by the data processing unit;
the power supply unit is used for providing working voltage for the sensitive element unit, the data processing unit and the communication unit;
the load information processing platform is used for receiving the digital information output by the sensor, processing data, acquiring the load of the motor vehicle, and triggering an alarm after determining that the load of the motor vehicle exceeds a preset load threshold;
the load information processing platform comprises: an interface display unit, a GPS positioning unit, a first communication unit, a second communication unit, a data processing unit and a power supply unit, wherein,
the interface display unit is used for displaying the installation position information of the sensor on the motor vehicle, and displaying the alarm information output by the data processing unit and the sensor installation position information corresponding to the alarm information;
the GPS positioning unit is used for acquiring GPS information of the motor vehicle and outputting the information to the data processing unit;
the first communication unit is used for receiving the digital information output by the sensor communication unit and outputting the digital information to the data processing unit;
the second communication unit is used for sending the information output by the data processing unit to the remote monitoring center;
the data processing unit is used for receiving the digital information output by the sensor communication unit, processing the data, acquiring the load of the motor vehicle, outputting alarm information and sensor installation position information corresponding to the alarm information to the interface display unit after determining that the load of the motor vehicle exceeds a preset load threshold value, receiving GPS information output by the GPS positioning unit, carrying the GPS information in the alarm information, and outputting the GPS information to the second communication unit;
the power supply unit is used for providing voltage required by work for the interface display unit, the GPS positioning unit, the first communication unit, the second communication unit and the data processing unit;
and the remote monitoring center is used for receiving the alarm information sent by the load information processing platform in a wireless mode, storing and analyzing the alarm information.
2. The system of claim 1, wherein the load information processing platform is further configured to store license plate information of the vehicle, and to carry the license plate information of the vehicle when outputting the warning information to the remote monitoring center.
3. The system of claim 1, wherein the communication unit is further configured to receive the collecting command output by the load information processing platform and output the collecting command to the sensor unit;
and the sensitive element unit enters a working state according to the acquisition instruction, senses the load of the vehicle body and puts the sensitive element unit in a dormant state after the acquisition is finished.
4. The system of claim 1, wherein the sensor further comprises:
and the digital signal processor is connected with the power supply unit through the integrated circuit interface circuit or the universal asynchronous receiver/transmitter interface, monitors the voltage of the power supply unit, and informs the load information processing platform when the voltage of the power supply unit is lower than a preset voltage threshold value.
5. A method for monitoring load safety of a motor vehicle, the method comprising:
a sensor arranged at the joint of a vehicle body bearing wheel shaft and a vibration reduction steel plate senses the load of a vehicle body, amplifies, filters and digitally converts sensed analog information in a preset acquisition period, and then outputs digital information to a load information processing platform in a wireless mode;
the load information processing platform receives the digital information output by the sensor, performs data processing to obtain the motor vehicle load, and triggers an alarm after determining that the motor vehicle load exceeds a preset load threshold;
the load information processing platform establishes a mapping relation between a sensor identifier and a sensor installation position in advance, sets a load threshold corresponding to the installation position for each sensor of the installation position, performs data processing to obtain a motor vehicle load, and after determining that the motor vehicle load exceeds the preset load threshold, the load information processing platform comprises:
receiving digital information output by each sensor in an acquisition period;
determining the load corresponding to the digital information of the sensor according to the performance parameters of the sensor, and taking the load as the load of the motor vehicle;
and inquiring and acquiring the sensor load threshold according to the sensor identification, and if the motor vehicle load corresponding to the sensor digital information exceeds the corresponding load threshold of the sensor, determining that the motor vehicle load exceeds the preset load threshold.
6. The method of claim 5, wherein the sensor mounted at the junction of the vehicle body load-bearing axle and the damping steel plate comprises:
a sensor arranged at the central position of the vehicle body at the joint of the vehicle body bearing wheel shaft and the vibration reduction steel plate, and,
and the sensors are arranged at the positions of two sides of the connecting part of the vehicle body bearing wheel shaft and the vibration reduction steel plate, which are symmetrical to the center of the vehicle body.
7. The method of claim 6, wherein the triggering an alarm comprises:
generating alarm information, and displaying the alarm information and sensor installation position information corresponding to the alarm information on a display panel of the load information processing platform; and/or the presence of a gas in the gas,
generating alarm information, and sending the alarm information and sensor installation position information corresponding to the alarm information to a preset remote monitoring center through a wireless network; and/or the presence of a gas in the gas,
and performing sound-light alarm on the measuring point corresponding to the sensor exceeding the load threshold.
8. The method of claim 5, wherein the vehicle load comprises: measuring point single load, measuring point average load and comprehensive average load; wherein, each sensor corresponds to a measuring point, and the analog information sensed by the measuring point with the measuring point number A is set as AiWherein, i is a natural number, then:
measure a point single load of Ai；
Average load of measuring point
The calculation formula of (2) is as follows:
in the formula, n is the collection frequency in the collection period;
integrated average load
The calculation formula of (2) is as follows:
in the formula, k is the number of measuring points;
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| CN105253019B (en) * | 2015-09-08 | 2018-08-17 | 中国矿业大学 | A kind of cargo vehicle axle load method of real-time and device |
| CN106274670B (en) * | 2016-07-25 | 2018-12-25 | 北汽福田汽车股份有限公司 | A kind of vehicle and the suggestion device that overloads |
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