CN203037330U - Vehicle overload detection device based on single-chip microcomputer - Google Patents

Abstract

The utility model discloses a vehicle overload detection device based on a single-chip microcomputer. The vehicle overload detection device comprises the single-chip microcomputer. The vehicle overload detection device further comprises an acquisition module, a communication module, a watchdog module, a display module, an alarm lamp and a buzzer which are connected with the single-chip microcomputer, wherein the acquisition module comprises a sensor, an amplifier and an A/D converter which are sequentially connected, the communication module comprises an RS-485 chip, the watchdog module comprises a monitoring chip, and the display module comprises an interface chip as well as an LED display and a keyboard which are respectively connected with the interface chip. The vehicle overload detection device based on the single-chip microcomputer of the utility model can assist in improving the accuracy of vehicle overload detection, saving detection time, improving the efficiency of the vehicle overload detection and shortening the time for the vehicle overload detection. The vehicle overload detection device based on the single-chip microcomputer of the utility model is advantageous in accurate results, simple circuits, convenient installation, low cost and the like.

Description

A Vehicle Overload Detection Device Based on SCM

technical field

The utility model belongs to the technical field of automobiles, in particular to a vehicle overload detection device based on a single-chip microcomputer.

Background technique

Vehicle overloading refers to the situation in which the quality of goods carried by a transport vehicle exceeds the rated loading quality. There are two main hazards of vehicle overloading: 1. Vehicle overloading will increase the damage of vehicles to the road surface. According to the calculation method commonly used in the world, the damage relationship between the mass of the vehicle axle load and the road surface obeys the "sixteenth law", that is, the vehicle axle load Every time the load quality doubles, the road damage will increase by 16 times, and the annual loss of national roads due to vehicle overloading exceeds 30 billion yuan. 2. It is easy to cause road traffic accidents. After the car is overloaded, the vehicle is in an overloaded state, which will lead to a rapid decline in the safety performance of the vehicle, such as braking and operability. According to statistics, more than 80% of the road traffic accidents of heavy-duty trucks are caused by overloaded transportation. At present, in order to effectively control the serious illegal overloading and over-limit transportation of motor vehicles, prevent road traffic accidents, and maintain good road traffic order, many traffic management departments have specially set up "overtaking" agencies, and "overtaking" personnel go to the road day and night to check and block , Often cause traffic jams, check one leak, and manual judgment lacks accuracy, and unhealthy tendencies in checking and blocking occur from time to time.

Contents of the invention

The purpose of this utility model is to provide a vehicle overload detection device based on a single-chip microcomputer. The device can weigh passing motor vehicles and judge whether they are overloaded. If overloaded, it will display the overload weight and give an alarm.

In order to realize above-mentioned task, the utility model adopts following technical scheme to realize:

A vehicle overload detection device based on a single-chip microcomputer, including a single-chip microcomputer, and also includes an acquisition module, a communication module, a watchdog module, a display module, a warning light and a buzzer respectively connected to the single-chip microcomputer, wherein the acquisition module includes Sensors, amplifiers and A/D converters connected in sequence; the communication module includes an RS-485 chip; the watchdog module includes a monitoring chip; the display module includes an interface chip and is connected to the interface chip respectively LED display and keyboard.

The utility model also has the following technical characteristics:

Described single-chip microcomputer adopts AT89C51 single-chip microcomputer.

The sensor adopts WPL110 bridge load cell.

Described amplifier adopts OP07 amplifier.

Described A/D converter adopts TLC0838 converter.

Described RS-485 chip adopts MAX485 chip.

The monitoring chip adopts MAX813L chip.

Described warning light adopts LED light.

The interface chip adopts 8255A chip.

The vehicle speed alarm system based on the single-chip microcomputer of the utility model uses the single-chip microcomputer as the main control chip, and allows the driver to set the maximum load capacity (rated load capacity) of the vehicle through the keyboard from the driver's point of view, and uses the bridge type load cell to control the motor vehicle. The load is converted into a voltage signal; then the voltage is conditioned by the amplifying circuit and sent to the A/D conversion chip to convert it into a digital signal and calculate the load, compare it with the set load and judge whether it is overloaded, if it is overloaded, it will display overload At the same time, the buzzer starts to alarm. The utility model can improve the accuracy of the vehicle overload detection, save the detection time, improve the detection efficiency of the load capacity of the vehicle, and shorten the detection time of the load capacity of the vehicle. The utility model has the characteristics of accurate result, simple circuit, convenient installation and low cost.

Description of drawings

Fig. 1 is a structural connection diagram of the utility model.

Fig. 2 is the work flowchart of the utility model.

Below in conjunction with accompanying drawing, the utility model is further described.

Detailed ways

Comply with above-mentioned technical scheme, as shown in Figure 1, a kind of vehicle overload detection device based on single-chip microcomputer of the present utility model comprises single-chip microcomputer, also comprises the collection module that is connected with single-chip microcomputer respectively, communication module, watchdog module, display module, Warning lamp and buzzer, wherein, described acquisition module comprises the sensor, amplifier and A/D converter connected in sequence; Described communication module comprises RS-485 chip; Described watchdog module comprises monitoring chip; The display module includes an interface chip, an LED display and a keyboard respectively connected with the interface chip.

The utility model adopts AT89C51 single-chip microcomputer as the control core. The setting and use of the I/O pin of the 51 series is very simple. When the pin is used as an input pin, it only needs to be set to a high level. Using the 51 series AT89C51 single-chip microcomputer can greatly simplify the circuit, and the programming and curing of the program are also quite convenient and flexible.

The watchdog module includes a MAX813L monitoring chip, and the MAX813L has a reset output in the case of power-on, power-off, and supply voltage drop. Using the MAX813L chip, the watchdog circuit, power failure monitoring circuit and manual and automatic reset circuit of the single-chip computer system are realized, which can effectively solve the "crash" phenomenon and the adverse effects caused by power failure during program operation, so as to timely save data.

The communication module includes an RS-485 chip, and the utility model adopts a MAX485 chip, which is a kind of RS-485 chip of Maxim Company, which has low power consumption and high anti-interference ability.

The display module includes an interface chip, an LED display and a keyboard. The interface chip is an 8255A interface chip. The keyboard includes at least 10 small square switches. The driver can input the load capacity through the keyboard, and store the value into the processor through the 8255A.

Acquisition module includes bridge load cell WPL110, amplifier Op07, A/D converter TLC0838. The bridge type load cell WPL110 has a large force value and anti-eccentric load, and the combined pressure head has the function of automatic reset and self-alignment. High-precision, low-efficiency, and fully-sealed are suitable for various harsh environments. The Op07 chip is a low-noise, non-chopper-stabilized single operational amplifier integrated circuit. Many applications do not require additional zeroing measures. OP07 has the characteristics of low input bias current and high open-loop gain at the same time. The characteristics of low offset and high open-loop gain make OP07 especially suitable for high-gain measuring equipment and amplifying weak signals of sensors. TLC0838 can convert the amplified voltage signal into a digital signal and send it to the processor.

The alarm light is an LED light, which forms an alarm module with the buzzer. When the vehicle is overloaded, the device sends an instruction to the alarm module, the LED light flashes, and the buzzer keeps beeping at the same time.

With reference to Fig. 2, the working process of the present utility model is as follows:

When the device is powered on and reset, first check whether there is a power-off flag, if there is, call the recovery parameter subroutine to restore the protected data, and then initialize the system, including the port, 8255A interface chip, watchdog module, etc.; if Initialization is performed directly without the power-down flag. After the program is initialized, check the set value; after checking, collect the data. The bridge load cell WPL110 detects the gravity of the vehicle and converts it into a voltage signal, and outputs the detected data in the form of voltage pulses. Since the output voltage is relatively weak, the Op07 chip amplifies the pulse signal, and then TLC0838 can convert the amplified voltage signal into a digital signal and send it to the central processing unit. The signal is arranged into the memory of the main control chip through decoding, and then the pre-set gravity conversion code of the microcontroller is run to convert it into the actual load M of the vehicle, which is displayed on the LED display. The actual load M is compared with the rated load Mm locked by the previous driver through the keyboard keys. When the load is less than the set rated load, the vehicle is loaded normally; when the load is higher than the set rated load, the vehicle is judged Overload, the single-chip microcomputer sends execution instructions to the alarm module. At this time, the alarm light flickers and the buzzer sounds for a long time, playing the role of alarm; at the same time, the single-chip microcomputer regularly transmits a large amount of sampling data to the upper PC through the communication module for backup.

Claims (9)

1. SCM Based overload of vehicle pick-up unit, comprise single-chip microcomputer, it is characterized in that, also comprise the acquisition module, communication module, watchdog module, display module, alarm lamp and the hummer that are connected with single-chip microcomputer respectively, wherein, described acquisition module comprises sensor, amplifier and the A/D converter that connects successively; Described communication module comprises the RS-485 chip; Described watchdog module comprises monitoring chip; Described display module comprises interface chip and the light-emitting diode display that is connected with interface chip respectively and keyboard.

2. SCM Based overload of vehicle pick-up unit as claimed in claim 1 is characterized in that, described single-chip microcomputer adopts the AT89C51 single-chip microcomputer.

3. SCM Based overload of vehicle pick-up unit as claimed in claim 1 is characterized in that, described sensor adopts WPL110 bridge-type LOAD CELLS.

4. SCM Based overload of vehicle pick-up unit as claimed in claim 1 is characterized in that, described amplifier adopts the OP07 amplifier.

5. SCM Based overload of vehicle pick-up unit as claimed in claim 1 is characterized in that, described A/D converter adopts the TLC0838 converter.

6. SCM Based overload of vehicle pick-up unit as claimed in claim 1 is characterized in that, described RS-485 chip adopts the MAX485 chip.

7. SCM Based overload of vehicle pick-up unit as claimed in claim 1 is characterized in that, described monitoring chip adopts the MAX813L chip.

8. SCM Based overload of vehicle pick-up unit as claimed in claim 1 is characterized in that, described alarm lamp adopts the LED lamp.

9. SCM Based overload of vehicle pick-up unit as claimed in claim 1 is characterized in that, described interface chip adopts the 8255A chip.

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