CN106093953A - Road barricade detector - Google Patents

Abstract

The present invention proposes a road obstacle detector, comprising: an ultrasonic ranging sensor, an ultrasonic transmitting device for transmitting ultrasonic signals forward, and an ultrasonic receiving device for receiving reflected ultrasonic signals; the control unit calculates the time and time for transmitting the ultrasonic signals Receive the time difference of the reflected ultrasonic signal, compare the difference with the preset time difference, judge whether there is an obstacle on the road ahead, if there is an obstacle, further calculate the obstacle height; the computer system receives the obstacle height, and will The height of the obstacle is compared with the preset height threshold. If it is greater than the preset height threshold, it is judged that the vehicle cannot pass through and an alarm control signal is sent out; the alarm device sends out an alarm signal according to the alarm control signal; The distance sensor is powered. The invention can achieve the effect of early warning and reduce unnecessary losses during the running of the vehicle.

Description

Road Obstacle Detector

technical field

The invention relates to the technical field of road detection, in particular to a road obstacle detector.

Background technique

With the rapid development of my country's economy, the number of vehicles across the country is increasing day by day, but the roads in our country have not yet been fully leveled. In most 2.3-tier cities and villages, there are still roads that are uneven, with convex and subsidence. As a result, the vehicle is prone to sinking or causing damage to the vehicle chassis, bumper, etc. when the vehicle passes by, causing losses to the vehicle, resulting in unnecessary waste of time and money. In addition, the equipment currently loaded on the vehicle cannot measure it, only by visual inspection, which is too limited and inaccurate, and it is even more difficult to measure when the visibility is relatively low or the speed of the vehicle is relatively fast.

Contents of the invention

The aim of the present invention is to solve at least one of said technical drawbacks.

For this reason, the purpose of the present invention is to propose a road obstacle detector, which can realize automatic monitoring and early warning. By comparing and analyzing the time difference between ultrasonic emission and reception and the standard time difference, the data is calculated and analyzed by a single-chip microcomputer, so as to achieve early warning. The effect of reducing unnecessary losses in the process of driving the vehicle.

In order to achieve the above object, an embodiment of the present invention provides a road obstacle detector, comprising: an ultrasonic ranging sensor, comprising: an ultrasonic transmitting device and an ultrasonic receiving device, the ultrasonic transmitting device is used to transmit ultrasonic signals forward, the The ultrasonic receiving device is used to receive the reflected ultrasonic signal;

A control unit, the control unit is connected with the ultrasonic ranging sensor, and is used to calculate the difference between the time of transmitting the ultrasonic signal and the time of receiving the reflected ultrasonic signal, and compare the difference with the preset time difference , to determine whether there is an obstacle on the road ahead, and if there is an obstacle, further calculate the height of the obstacle;

a computer system, the computer system communicates with the control unit, receives the obstacle height from the control unit, compares the obstacle height with a preset height threshold, and if it is greater than the preset height threshold , it is judged that the vehicle cannot pass, and an alarm control signal is issued;

an alarm device, the alarm device is connected to the computer system and is used to send an alarm signal according to the alarm control signal;

A power supply device, the power supply device is connected to the internal source of the vehicle and the ultrasonic distance measuring sensor, and is used to supply power to the internal source of the vehicle and the ultrasonic distance measuring sensor.

Further, the control unit is a single-chip microcomputer.

Further, the computer system communicates with the control unit through the Zigbee protocol.

Further, the alarm device is an audible and visual alarm.

Further, the power supply device further includes: a battery, which is connected to the ultrasonic distance measuring sensor and supplies power to the ultrasonic distance measuring sensor through discharge.

Further, the battery is a lithium battery.

Further, it also includes: a storage device, the storage device is connected to the associated single-chip microcomputer, and is used for storing the time of transmitting the ultrasonic signal, the time of receiving the reflected ultrasonic signal and the calculated obstacle height.

Further, it also includes: a display device, the display device is connected with the control unit, and is used to display the obstacle height calculated by the control unit in real time.

Further, the display device adopts a common cathode digital tube.

According to the road obstacle detector of the embodiment of the present invention, ultrasonic technology is used to accurately measure the road conditions in front of the vehicle and monitor and alarm, and the characteristic design of ultrasonic waves is used to realize the detection of obstacles in front of the road. The best time is compared, and finally determine whether the road is smooth and whether the vehicle can pass normally. The present invention realizes an automatic monitoring and early warning for measuring road obstacles. By comparing and analyzing the time difference between ultrasonic emission and reception and the standard time difference, the data is calculated and analyzed by a single-chip microcomputer, so as to achieve the effect of early warning and reduce the impact on the vehicle during driving. Unnecessary loss, compared with other equipment, ultrasonic equipment is less affected by external and weather factors and can effectively and accurately measure.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Description of drawings

The above and/or additional aspects and advantages of the present invention will become apparent and comprehensible from the description of the embodiments in conjunction with the following drawings, wherein:

1 is a schematic diagram of a road obstacle detector according to an embodiment of the present invention;

Fig. 2 (a) and (b) are the working schematic diagrams of the road obstacle detector according to the embodiment of the present invention;

Fig. 3 is a working flow chart of the road obstacle detector according to the embodiment of the present invention.

detailed description

Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

As shown in FIG. 1 , the road obstacle detector according to the embodiment of the present invention includes: an ultrasonic ranging sensor 1 , a control unit 2 , a computer system 3 , an alarm device 4 and a power supply device 5 . Wherein, the road obstacle detector can be installed on the vehicle, and can monitor and give an alarm in real time to the presence or absence of obstacles in front of the vehicle during the driving process of the vehicle.

Specifically, the ultrasonic ranging sensor includes: an ultrasonic emitting device and an ultrasonic receiving device.

The ultrasonic transmitting device is used for transmitting ultrasonic signals to the front. Specifically, the ultrasonic emitting device generates a 40 kHz ultrasonic signal through the probe after being driven by a driver. Wherein, the driver can be designed as a driving circuit with a driving current above 100mA.

The ultrasonic receiving device is used to receive the reflected ultrasonic signal. Specifically, the ultrasonic receiving device includes an ultrasonic receiving probe, a signal amplifying circuit and a waveform transforming circuit. Among them, the ultrasonic receiving probe adopts a probe with a model of CSB40R. After receiving the reflected ultrasonic signal, it is amplified by the amplifier circuit and converted by the waveform, and then received by the control unit.

The control unit is connected with the ultrasonic ranging sensor, which is used to calculate the difference between the time of transmitting the ultrasonic signal and the time of receiving the reflected ultrasonic signal, compare the difference with the preset time difference, and judge whether there is an obstacle on the road ahead. If there is an obstacle, further calculate the obstacle height.

In one embodiment of the present invention, the control unit may be a single chip microcomputer. Preferably, the control unit can adopt 51 single-chip microcomputers. The control unit adopts low-voltage, high-performance CMOS 8-bit single-chip microcomputer. The chip contains rewritable read-only Flash program memory and random access data memory. The chip has a built-in general-purpose 8-bit central processing unit and Flash storage unit. The microcontroller has 20 pins, 15 bidirectional input and output windows, two external interrupt ports, two 16-bit programmable timing counters, two full bidirectional serial communication ports, and an analog comparison amplifier.

Specifically, as shown in Figure 2 (a) and (b), the single-chip microcomputer controls the ultrasonic ranging sensor to transmit ultrasonic signals forward, and the ultrasonic signals return when encountering obstacles, and the ultrasonic receiver stops immediately after receiving the reflected ultrasonic signals. timing. The single-chip computer calculates the difference between the time of transmitting the ultrasonic signal and the time of receiving the reflected ultrasonic signal, and then compares the time difference with the preset time when the ultrasonic wave hits the flat ground and returns when encountering an obstacle. , to judge whether the ground ahead is flat or there are obstacles ahead. If there is an obstacle, the single-chip microcomputer further calculates the height of the obstacle, and then sends it to the computer system for analysis and processing, so as to realize real-time monitoring and early warning of the road ahead of the vehicle.

In addition, the road obstacle detector in the embodiment of the present invention further includes: a display device. The display device is connected with the control unit and used for real-time display of the obstacle height calculated by the control unit.

Preferably, the display device can use a common-cathode digital tube. Among them, the display device adopts MAX7219 6-bit common-cathode digital tube display, the peak current can reach 40MA, the highest serial scanning frequency is 10MHz, and the data is transmitted through the three-line serial interface.

The computer system communicates with the control unit, receives the obstacle height from the control unit, compares the obstacle height with the preset height threshold, and if it is greater than the preset height threshold, it is judged that the vehicle cannot pass, and an alarm control signal is sent. Among them, the ultrasonic propagation speed in the air is 340m/s, according to the time t recorded by the timer, it can be calculated whether there is an obstacle and whether the vehicle can pass through the obstacle.

In one embodiment of the present invention, the computer system can communicate with the control unit through the Zigbee protocol, analyze whether the vehicle can pass through according to the measured obstacle height, and present it to the staff and give a timely warning. This kind of utilization measurement is more accurate and prevents unnecessary losses caused by human visual errors.

The alarm device is connected with the computer system and is used for sending out an alarm signal according to the alarm control signal. In one embodiment of the present invention, the alarm device is an audible and visual alarm. Among them, the acousto-optic alarm adopts a single-sound-flicker alarm sound integrated circuit model M3720, which stores an alarm sound effect, which can directly drive the buzzer to sound, and can also drive the LCD screen to display. The buzzer sends out a buzzing sound, and an alarm can be issued to remind the driver to pay attention.

The power supply unit is connected with the internal source of the vehicle and the ultrasonic distance measuring sensor for supplying power to the internal source of the vehicle and the ultrasonic distance measuring sensor. That is, using the voltage provided by the car, when the internal battery of the system is out of power, the power supply unit can charge it, and at the same time supply the work of the ultrasonic distance measuring sensor.

In an embodiment of the present invention, the power supply device further includes: a battery, which is connected to the ultrasonic distance measuring sensor, and supplies power to the ultrasonic distance measuring sensor through discharge. Wherein, the battery can be a lithium battery. When it needs to work, it can support the work of the ultrasonic transceiver circuit through its own discharge.

Furthermore, the road obstacle detector in the embodiment of the present invention further includes: a storage device. The storage device is connected with the associated microcontroller and is used for storing the time of transmitting the ultrasonic signal, the time of receiving the reflected ultrasonic signal and the calculated obstacle height. Wherein, the storage device can be repeatedly erased and written, and it is responsible for storing data materials to be forwarded.

Fig. 3 is a working flow chart of the road obstacle detector according to the embodiment of the present invention.

Step S301, system initialization.

Step S302, setting the reset key.

Step S303, clearing the receiving buffer.

Step S304, judging whether it is always true, if yes, execute step S305, otherwise execute step S315;

Step S305, the single-chip microcomputer starts to receive data;

Step S306, connect the display;

Step S307, detecting whether the prompt of successful connection (CONNECT OK) is received, if yes, then execute step S308;

Step S308, judging whether there is a query request from the display, if yes, execute step S309, otherwise execute step S311;

Step S309, frame sending, including: the serial number of this module, the sending distance and the end sign;

Step S310, close the connection.

Step S311, sending information.

Step S312, frame sending, including: the serial number of this module, the sending distance and the end sign;

Step S313, close the connection.

Step S314, the loop is interrupted.

Step S315, waiting for the next startup.

According to the road obstacle detector of the embodiment of the present invention, ultrasonic technology is used to accurately measure the road conditions in front of the vehicle and monitor and alarm, and the characteristic design of ultrasonic waves is used to realize the detection of obstacles in front of the road. The best time is compared, and finally determine whether the road is smooth and whether the vehicle can pass normally. The present invention realizes an automatic monitoring and early warning for measuring road obstacles. By comparing and analyzing the time difference between ultrasonic emission and reception and the standard time difference, the data is calculated and analyzed by a single-chip microcomputer, so as to achieve the effect of early warning and reduce the impact on the vehicle during driving. Unnecessary loss, compared with other equipment, ultrasonic equipment is less affected by external and weather factors and can effectively and accurately measure.

In the description of this specification, descriptions with reference to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , structure, material or feature is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be construed as limitations to the present invention. Variations, modifications, substitutions, and modifications to the above-described embodiments are possible within the scope of the present invention. The scope of the invention is defined by the appended claims and their equivalents.

Claims (9)

1. a road barricade detector, it is characterised in that described road barricade detector is installed on vehicle, including:

Ultrasonic distance-measuring sensor, including: ultrasonic transmission device and ultrasonic probe, ultrasonic receiver, described ultrasonic transmission device is used Launch ultrasonic signal in forwards, described ultrasonic probe, ultrasonic receiver is for receiving the ultrasonic signal being reflected back；

Control unit, described control unit is connected with described ultrasonic distance-measuring sensor, launches ultrasonic signal for calculating Time and the difference receiving the time being reflected back ultrasonic signal, compare described difference with Preset Time difference, sentence Whether disconnected road ahead has barrier, if there being barrier to calculate obstacle height further；

Computer system, described computer system communicates with described control unit, receives the barrier from described control unit Hinder thing height, described obstacle height is compared with the height threshold preset, if greater than described default height threshold, Then judge that vehicle cannot pass through, send alarm control signal；

Alarm device, described alarm device is connected with described computer system, for sending report according to described alarm control signal Alert signal；

Supply unit, described supply unit is connected with inside sources and the ultrasonic distance-measuring sensor of described vehicle, for described Inside sources and the ultrasonic distance-measuring sensor of vehicle are powered.

2. road barricade detector as claimed in claim 1, it is characterised in that described control unit is single-chip microcomputer.

3. road barricade detector as claimed in claim 1 or 2, it is characterised in that described computer system passes through Zigbee Agreement communicates with described control unit.

4. road barricade detector as claimed in claim 1, it is characterised in that described alarm device is audible-visual annunciator.

5. road barricade detector as claimed in claim 1, it is characterised in that described supply unit also includes: battery, described Battery is connected with described ultrasonic distance-measuring sensor, is powered to described ultrasonic distance-measuring sensor by electric discharge.

6. road barricade detector as claimed in claim 5, it is characterised in that described battery is lithium battery.

7. road barricade detector as claimed in claim 1, it is characterised in that also include: storage device, described storage device Be connected with affiliated single-chip microcomputer, for store the time of described transmitting ultrasonic signal, receive be reflected back ultrasonic signal time Between and the obstacle height that calculates.

8. road barricade detector as claimed in claim 1, it is characterised in that also include: display device, described display device It is connected with described control unit, shows the obstacle height that described control unit calculates in real time.

9. road barricade detector as claimed in claim 8, it is characterised in that described display device uses common cathode digital Pipe.