The Secret of Car Alarm System

Anti-theft common sense

The following describes the functions of several anti-theft devices.

Open anti-theft device

The function of the disconnected anti-theft device is to cut off the ignition circuit or fuel supply circuit of the engine, so that the engine cannot be started.

The first is the fuel cut-off device, which can be installed at any part of the fuel supply system (generally installed under the hood), as long as it is locked, the engine will not start due to lack of fuel or will stop after starting; secondly, the ignition After the switch is cut off and the ignition switch is turned off, the engine will not start because there is no ignition current. From the specific form used, there are both mechanical locks, magnetic remote control locks, and even combination locks; and batteries The terminal cutting device is installed next to the battery. As long as the battery power supply line is closed and locked, the entire car's power system will be cut off.

Electronic alarm system

The electronic alarm system is currently the most popular anti-theft device in automobiles, with advanced design and complex structure. However, the functions are all single: send out warning signals, ask for help and scare away thieves.

The first type of electronic warning system is a flash warning system, which is equipped with light-emitting diodes on the dashboard of the car, which not only allows the owner to know the working status of this system, but also can deter the car thief who spy on the cabin; the second type of electronic alarm The system can send a deterrent signal, once someone breaks into the car without permission, it can also send an alarm to the distant owner. The specific principle is: when the door, luggage compartment cover or hood is forcibly opened by someone, or when the glass on the car is broken, the sensor installed on the car turns on the magnetic generator to send a signal to the pager carried by the owner . The third type is the ultrasonic alarm,

The ultrasonic alarm is similar in size to a cassette recorder. The signal transmitter can use the ultrasonic transmitter to send high-frequency pulsed ultrasonic waves. When someone sneaks into the car, the ultrasonic receiver is disturbed, and the alarm immediately activates the alarm. This alarm system is equipped with a microwave signal processor, and the switch is a 4-digit combination lock. When the owner sits in the car, he has 15 seconds to turn off the alarm to avoid false alarms. The thief could not turn off the alarm because he did not know the password. The alarm always sounded no matter where the car was driven. The fourth type is a talking anti-theft device. The talking anti-theft device can form a microwave field around the vehicle. When someone enters the microwave field by mistake, the system's language synthesis device will issue a warning: "Please go back, you have Too close to the car ". If the person leaves the microwave field in time, the system will say politely: "Thank you!" If you continue to approach the car, the system will issue an alarm. When the owner returns, he will also tell the owner: "Someone has violated me just now".

Three keys

In recent years, with the continuous development of high technology, various human keys have appeared around the world. This human body key not only can effectively prevent the car from being stolen, but also provides great convenience to the owner.

The first key is a fingerprint key. German scientists made a car electronic lock using the same characteristics of fingerprint patterns. When making, the fingerprint image of the owner is built into the lock first. When the owner opens the door, as long as he presses his finger on the door lock, if the finger fingerprint matches the fingerprint image in the lock, the door will open immediately. The second key is the eye key. Swiss scientists have invented a car door lock that is controlled by retinal patterns. This door lock is equipped with a retina recognition system and a memory system. When the owner unlocks the lock, look at the door lock and take a look. If the retina pattern matches the recorded pattern, the door will open automatically; if it does not match, Then people refused. The third key is a finger key. American scientists have discovered through long-term observation and measurement that human fingers have different lengths. Based on this discovery, an electronic lock with a finger as the door key was quickly developed. This electronic lock is composed of a decoder and an encoder. The encoder is a device that records the length of the finger on a magnetic card, and the decoder verifies whether the length of the owner's finger matches the information recorded on the magnetic card. Device. When the car mainly opens the door, the electronic lock measures the finger of the door opener. If it matches the data on the magnetic card, the electronic lock immediately opens the door.

Four big locks

The mechanical anti-theft device uses a simple mechanical principle to lock a certain mechanism on the car so that it cannot effectively play its due role to achieve the purpose of anti-theft.

The first lock is to lock the accelerator pedal. A set of additional devices connecting the accelerator pedal and the door lock can not only interlock the accelerator pedal and the door lock, but also can be separated from each other, so that the accelerator can be operated independently to ensure the car Normal driving; the second lock is to lock the car steering mechanism. The role of the car steering mechanism is to ensure the smooth completion of the actions of car exit, parking, steering, and turning around. If the steering mechanism is locked after parking, the thief cannot drive away the car. This device can lock the steering wheel alone, as well as the steering rod, steering arm and other mechanisms. The third lock is to lock the brake pedal, so that the car has been in a braking state and cannot be started; the fourth lock is to lock the audio, aiming at some thieves who specialize in breaking glass and stealing audio, and some car owners use a sleeve-type security The lock interlocks the sound system with the steering wheel. Without a key, you can neither take away the stereo nor drive the car.

Anti-theft new technology

GPS satellite positioning car anti-theft system is a network type anti-theft device. It mainly achieves the purpose of anti-theft by locking the ignition or starting. At the same time, it can also silently transmit the alarm information and the location of the alarm vehicle to the alarm center through the GPS satellite positioning system. According to our understanding, GPS anti-theft device has many functions, not only can monitor the location of the vehicle in real time across the country, but also can monitor the sound in the car through the mobile phone of the car, if necessary, you can also shut down the vehicle oil circuit, circuit and lock all Doors and windows. If the GPS anti-theft device is illegally disassembled, it will send out an alarm message by itself. The local alarm station can accurately determine the vehicle's position within 2 minutes. The anti-theft effect of this product is obvious, but the disadvantage is that the price is more expensive.

GSM mobile anti-theft device is the fifth-generation car network anti-theft and anti-robbery positioning monitoring system. It relies on GSM communication network to carry out intelligent linkage anti-theft of mobile phones and cars. GSM mobile anti-theft device has many functions such as anti-theft, monitoring, remote control, remote alarm, positioning, anti-robbery, etc. It is the best protector to maintain social security and protect the interests of car owners. Compared with similar products, the system also has the characteristics of more concealed installation, more advanced technology and more reliable performance. It does not need to build a base station, the alarm is not limited by distance, no service fee, simple and convenient to use.

It should be seen that the anti-theft system is not a panacea. Many cars are now pre-installed with a computer anti-theft system before leaving the factory. When the key chip data matches the pre-stored data of the on-board computer, the computer will notify the relevant system to start working and allow the engine to start. Cars with onboard computer anti-theft systems do not need to install electronic anti-theft devices. If it is installed, it is easy to have a system conflict with the anti-theft system installed in the original car; if an electronic anti-theft device must be additionally installed, please be careful to separate it from the ignition system, otherwise it will cause the engine to fail to start and other failures. When a fault occurs, don't disassemble it by yourself, you can go to a professional car lock shop and use a professional decoder to clear the fault code.

According to another introduction, since the car door lock is destined not to be a foolproof general, the core content of car anti-theft is to prevent the "automobile" from being stolen. Even if the stolen person opens the door, he still cannot steal the car. Therefore, the car's engine locking system is the key to anti-theft. Usually we say that a car uses advanced anti-theft technology, mainly referring to its engine locking system. In foreign countries, people usually do not leave valuable things in the car, because even if there is no case where the door keys are opened each other, it is difficult to ensure that no unlocking master visits or the window is broken by someone, and car insurance does not include items in the car. . The popularity of convertible cars has also further downplayed the concept of door locking systems. Here, I particularly want to remind the owner to try not to leave valuables in the car, so as not to cause unnecessary losses.

Conversation about choosing car alarm

Automobile anti-theft device is the protector of the car. By matching the anti-theft device with the car circuit, the purpose of preventing the vehicle from being stolen and infringed, protecting the car and realizing various functions of the anti-theft device can be achieved.

Q: Are there any differences in anti-theft devices of different brands?

A: Each brand of anti-theft device has many differences in principle design, selection of components, processing technology and functional design of the anti-theft device. It is precisely because of these differences that the reliability and lifespan of the anti-theft device and the price are different.

From the principle design, for example:

(1) Whether the FR4 is designed with a double panel, its advantages are:

â‘ The solder joints of the components are firm, and the anti-theft device has strong anti-vibration. For the anti-theft device installed on the car that is subject to vibration and bumps every day, the strong anti-vibration can extend its service life.

â‘¡The anti-theft device has a small host, which is convenient for concealed installation.

(2) Whether the multiple circuit protection system is adopted, the advantage is that it can adapt to a wider range of battery voltage changes, and the anti-theft host microcomputer will not crash due to the low battery voltage, and the anti-interference ability is stronger.

From the selection of components, for example: (1) Whether the microcomputer used is an IC with a long memory time.

(2) Whether chip components are frequently used.

(3) Whether the components used have good temperature resistance and pressure resistance.

Q: Is it important to choose the installer of the anti-theft device?

A: This is really important!

The quality of automobile anti-theft devices is mainly determined by three factors: the quality of anti-theft devices, the installation method of anti-theft devices, and the correct use of anti-theft devices. The installation method of the anti-theft device is one of the same important factors as the quality of the anti-theft device, and the losses caused by the improper installation of the anti-theft device are even more heavy, such as the computer crash, the explosion of the airbag, the burning of the car circuit and other parts Damage, which must have been caused by improper installation. Therefore, choosing a good and experienced installer is the basic guarantee for your car and is very important.

Q: How to choose the installer of the anti-theft device correctly?

A: The experienced auto anti-theft device installer not only has a comprehensive understanding of the anti-theft device, but more importantly is to be very familiar with and understand the car circuit. They judge that the car circuit is not based on rote memorization, but on circuit theory knowledge. Especially in today's era, the replacement of cars is getting faster and faster. Only by knowledge of the circuit can we correctly judge the car line. When choosing the installer of the anti-theft device, please pay attention to the following points:

(1) Whether the shop has the qualifications for the operation and installation of anti-theft devices, including business licenses and qualification certificates of public security organs, etc.

(2) Whether the anti-theft device it sells is marked with the origin, this is the basic guarantee of whether your anti-theft device can get after-sales service and fault warranty in the future.

(3) Whether the shop holds the authorization of the anti-theft device manufacturer, which indicates whether the store has a comprehensive understanding of the brand's anti-theft device, and has received the manufacturer's installation training and recognition.

(4) After the anti-theft device is installed, be sure to ask the manufacturer for the anti-theft device warranty card with the seal of the installer and the phone.