CN203047163U - Anti-theft device for vehicle - Google Patents

Abstract

The utility model discloses an anti-theft device for automobiles, wherein an acceleration sensor is connected with an input end of a host through a noise filtering module and a signal amplification module connected in sequence, and the output end of the host is connected with a vehicle-mounted LED alarm display screen, a relay, and an audible and visual alarm respectively. The modules are connected, the vehicle GPS receiving antenna is connected to the host through the vehicle GPS receiving module, and the host is also connected to the slave; the slave is connected to the GSM/GPRS module through the high-frequency wireless data transmission anti-jamming module, and the GSM/GPRS module is connected to the owner through the GSM network The mobile phone is connected, and the GSM/GPRS module is also connected with a liquid crystal display and buttons. The utility model realizes the human-vehicle communication through the GSM/GPRS network, and provides a convenient device for the car owner to remotely monitor the car; the utility model has the characteristics of low energy consumption, high precision and accurate detection.

Description

A car anti-theft device

technical field

The utility model belongs to the field of automobile safety, in particular to an automobile anti-theft device.

Background technique

With the increase of car ownership, car thefts occur frequently. Now the most commonly used device is the magnetic effect type acceleration sensor, but it cannot measure the static acceleration, so it cannot cope with the frequent car theft of trailers or vehicle handling. Therefore, the micro-machined acceleration sensor that can measure the static acceleration has become the first choice. The method of combining this accelerometer with the now popular GSM/GPRS communication technology and GPS global positioning system greatly improves the range and range of car anti-theft alarms. Reliability has strong practical significance.

Contents of the invention

Aiming at the deficiencies in the prior art, the purpose of this utility model is to provide a car anti-theft device, which can enable the car owner to know the status of his car in real time through his mobile phone when the car owner is far away from the car.

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

An anti-theft device for a car, comprising an acceleration sensor, a host, a slave, a relay, a GSM/GPRS module and a mobile phone of the owner, the acceleration sensor is connected to the input of the host through a sequentially connected noise filter module and a signal amplification module, and the outputs of the host are respectively It is connected with the vehicle-mounted LED alarm display screen, relay and sound and light alarm module, the vehicle-mounted GPS receiving antenna is connected with the host through the vehicle-mounted GPS receiving module, and the host is also connected with the slave machine; the slave machine communicates with the GSM/GPRS anti-jamming module through high-frequency wireless data transmission The modules are connected, the GSM/GPRS module is connected with the owner's mobile phone through the GSM network, and the GSM/GPRS module is also connected with a liquid crystal display and buttons.

The utility model also has the following technical characteristics:

Both the host computer and the slave computer adopt ATMEGA16L-8AU single-chip microcomputer.

The acceleration sensor adopts the MMA7361 three-axis small-range acceleration sensor.

The GSM/GPRS module adopts the GSM/GPRS module whose model is SIM100.

The utility model realizes the mutual communication between people and vehicles through the GSM network. When the vehicle is stolen, the safety status information and location information of the vehicle are sent to the owner's mobile phone through a short message, so that the owner can remotely know the stolen information of his vehicle And the specific location, and can control the start of the vehicle through SMS. The utility model has the characteristics of low energy consumption, convenient installation, low cost, low false alarm rate, high precision and accurate detection.

Description of drawings

Fig. 1 is a schematic diagram of hardware connection of the present utility model.

Below in conjunction with accompanying drawing and embodiment the concrete content of the present utility model is described in further detail.

Detailed ways

The specific embodiments of the present utility model are provided below, and it should be noted that the present utility model is not limited to the following specific embodiments, and all equivalent transformations done on the basis of the technical solution of the application all fall into the protection scope of the present utility model.

Comply with above-mentioned technical scheme, as shown in Figure 1, a kind of car anti-theft device comprises acceleration sensor, main frame, slave machine, relay, GSM/GPRS module and car owner's mobile phone, and acceleration sensor is connected with noise filter module and signal amplification module successively. The input terminal of the host computer is connected, the output terminal of the host computer is connected with the vehicle-mounted LED alarm display screen, the relay and the sound and light alarm module respectively, the vehicle-mounted GPS receiving antenna is connected with the host computer through the vehicle-mounted GPS receiving module, and the host computer is also connected with the slave machine; The frequency wireless data transmission anti-jamming module is connected with the GSM/GPRS module, and the GSM/GPRS module is connected with the owner's mobile phone through the GSM network, and the GSM/GPRS module is also connected with a liquid crystal display and buttons.

Both the host computer and the slave computer adopt ATMEGA16L-8AU single-chip microcomputer. The single-chip microcomputer includes high-performance, low-power 8-bit AVR microprocessor, advanced RISC structure, 512-byte EEPROM can be erased and written 10,000 times, four-channel PWM, 8-way 10-bit ADC, and UART is integrated on the chip. SPI, I2C and other interfaces, the interface module can use these interfaces to communicate with other systems.

The acceleration sensor adopts the MMA7361 acceleration sensor of Freescale Corporation, and the three-axis small-range acceleration sensor is a sensor that detects the motion and direction of the object, and it changes the voltage value of the output signal according to the motion and direction of the object. When the signal of each axis is not moving or not being acted by gravity (0g), its output is 1.65V. If it moves in a certain direction, or is subjected to gravity, the output voltage will change its output voltage according to the direction of its movement and the set sensor sensitivity. The three-axis acceleration sensor can also measure the acceleration values of each axis of the inclinometer separately, and then calculate the inclination angle of each axis.

The noise filtering module and the signal amplifying module are commonly used noise filtering circuits and signal amplifying circuits in the field.

The vehicle-mounted GPS receiving module adopts a model GT-710F GPS module, which can receive 44 satellites at the same time; the positioning accuracy can reach 5 meters; low power consumption, supports external antennas, and communicates with the host through a serial port. Process the obtained positioning signal through the host, and then send it to the slave through the SPI interface, and control the GSM/GPRS module through the slave.

Described GSM/GPRS module adopts the model that SIMCOM company provides is the GSM/GPRS module of SIM100, and this GSM/GPRS module has standard AT command interface, can provide services such as GSM voice, short message and GPRS surfing the Net. SIM100 is a GSM/GPRS dual-frequency module, which has its own RS232 communication interface, which can easily communicate with PC and single-chip microcomputer.

The high-frequency wireless data transmission anti-interference module model is GD-R5D, which is a VHF/UHF ultra-high frequency wireless data transmission high-quality superheterodyne receiving module that can strengthen the anti-interference ability of mobile phones/improve the decoding waveform.

The liquid crystal display adopts Nokia 5110 (PCD8544 controller) liquid crystal display, 48*84 dot-matrix LCD, and interacts with the GSM/GPRS module through buttons, which can be used to set the user's mobile phone number or display the text message. When the car owner leaves the car, the liquid crystal display can be disconnected to save power and increase concealment.

The relay is a commonly used normally closed relay, which is driven by an NPN transistor.

The sound and light alarm module is composed of the car's own turn signal, flasher, and a horn.

The alarm display screen is composed of commonly used multi-chip 16x16 dot matrix, installed in the rear window glass, and driven by 74LS154 and NPN triode.

In order to prevent thieves from disabling the alarm circuit by cutting off the battery, the power supply of this device is powered by another set of independent vehicle power supply independent of the vehicle battery, and the voltage is 5V. Install the accelerometer in the center of the chassis.

The acceleration sensor can separately measure the acceleration values of each axis of the inclinometer, and then calculate the inclination angle of each axis. The three-way analog voltage signal provided by the three-axis acceleration sensor is input to the built-in A/D conversion interface of the host after being processed by the noise filter module and the signal amplification module, and the voltage signal detected by the acceleration sensor is converted into a single-chip microcomputer. The processed digital signal measures the change value of the 3-axis inclination angle. When there is a car theft with a trailer or a moving car, the inclination angle of the car body will inevitably change at this time, and the acceleration values of the three axes obtained by the acceleration sensor will also change. The signal is sent to the host for processing, and the voltage signal It is converted into a digital signal of the tilt angle of the vehicle body. Then the host computer judges whether the tilt angle of the car body exceeds the range of the limited angle. If it exceeds, it can be considered that there is a car theft or car damage. If it does not exceed the limited angle, it is considered that there is no car theft or car damage. occur. If it has been determined that there is a car theft or destruction of the car, first cut off the power supply circuit and the fuel injection signal circuit of the car ignition switch through the relay, and drive the sound and light alarm module to generate an alarm. At the same time, the master sends a signal to the slave, and the slave controls The GSM/GPRS module sends an alarm message to the owner's mobile phone with a pre-set number to remind the owner of the car theft. Coupled with the positioning function provided by the GPS, in case the car is stolen, it is very conducive to the recovery of the stolen car.

The car owner can also obtain the position of the car at this time by sending a text message to determine whether the car has changed its position. The vehicle-mounted GPS receiving antenna receives the GPS signal, and the GPS signal is processed by the vehicle-mounted GPS receiving module and then output to the host, the host communicates with the slave through the SPI interface after processing the location information, and the slave controls the GSM/GPRS module to communicate with the owner's mobile phone. If the thief starts the car in other ways, the car LED alarm display on the rear window will display the words "This car has been stolen, please assist in calling the police".

Claims (4)

1. A car anti-theft device, comprising an acceleration sensor, a main frame, a slave, a relay, a GSM/GPRS module and a mobile phone of a car owner, is characterized in that the acceleration sensor is connected to the input end of the main frame through successively connected noise filter modules and signal amplification modules , the output terminals of the host are respectively connected with the vehicle LED alarm display screen, the relay and the sound and light alarm module, the vehicle GPS receiving antenna is connected with the host through the vehicle GPS receiving module, and the host is also connected with the slave; The interference module is connected with the GSM/GPRS module, and the GSM/GPRS module is connected with the owner's mobile phone through the GSM network, and the GSM/GPRS module is also connected with a liquid crystal display and buttons. 2. automobile anti-theft device as claimed in claim 1, is characterized in that, described main frame and slave all adopt ATMEGA16L-8AU single-chip microcomputer. 3. The automobile anti-theft device according to claim 1, wherein the acceleration sensor is an MMA7361 three-axis small-range acceleration sensor. 4. The car anti-theft device according to claim 1, wherein the GSM/GPRS module adopts a model SIM100 GSM/GPRS module.

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