Time: 2008-03-19 Source: Edit: View: 24
Car anti-theft device is a device installed on the car to increase the difficulty of car theft and prolong the time of car theft.
With the progress of science and technology, in order to deal with the escalating means of car theft, people have developed various methods and structures of anti-theft devices from generation to generation. At present, anti-theft devices can be divided into three categories according to their structures: mechanical, electronic and Network style. Hook lock,Steering wheel lockAnd gear locks, etc. are basically mechanical anti-theft devices, which are mainly * lock clutch, brake, throttle orsteering wheel, Shift gears to achieve the purpose of anti-theft, but only anti-theft does not alarm. The plug-in type, button type and remote control type are all electronic anti-theft devices. They are mainly used to lock the ignition or start to achieve the purpose of anti-theft. At the same time, it has anti-theft and sound alarm functions. GPS satellite positioning car anti-theft system belongs to the network type anti-theft device, it is mainly * lock the ignition or start to achieve the purpose of anti-theft, and at the same time can also through the GPS satellite positioning system (or other network systems), the alarm information and the location of the alarm vehicle Silent transmission to the alarm center.
Features of remote control car anti-theft device
The remote control car alarm is developed with the advancement of electronic technology and is the most widely popularized one in the market. It is characterized by the remote control of all the functions of the anti-theft device, which can be extremely convenient, and can be equipped with functions such as vibration detection, door control protection, and microwave or infrared probes. As the market's requirements for anti-theft devices continue to increase, remote-controlled car anti-theft devices have added many additional functions that are convenient to use, such as remote central control door locks, remote control of heating and cooling, remote control of electric doors and windows, and remote opening of the luggage compartment.
The main configuration of remote control car anti-theft device
A complete set of remote control car anti-theft device consists of the following parts:
(1) Host part: It is the core and control center of the anti-theft device.
(2) Induction detection part: It can be composed of sensors or probes. At present, oscillation sensors are commonly used, and microwave and infrared probes are less used.
(3) Door control part: including front coverswitch, Door switches and luggage compartment switches, etc.
(4) Alarm part: horn.
(5) Wiring part.
(6) Other parts: including stickers, screws andRelayWaitAccessoriesAnd operating instructions and installation wiring diagrams, etc.
Anti-theft device password
Similar to the working principle of a mobile phone, the remote control transmitter and the anti-theft host system of the remote control car anti-theft device must have the same transmitting and receiving frequency as well as a password to identify each other.
The password of the anti-theft device is a group of data combined in different ways, and it is a key of the anti-theft device. On the one hand, it records the identity data (identity code) of the anti-theft device, which distinguishes the difference of each anti-theft device; on the other hand, it also contains the anti-theft function instruction data (data code or command code), which is responsible for opening or closing the anti-theft device. , Control and complete all functions of the anti-theft device.In other words, with this set of passwords, you also have control over how to turn on the anti-theft device.
key.
Several main types of remote control car anti-theft devices
According to the different ways of transmitting passwords, remote control car anti-theft devices are mainly divided into two types: fixed-code anti-theft devices and code-hopping anti-theft devices. Early anti-theft devices mostly used fixed code methods, but due to their own shortcomings, they have gradually been replaced by code-hopping anti-theft devices with more advanced technology and better anti-theft effects. The principles and characteristics of the two different types of anti-theft devices are introduced below.
Fixed code anti-theft device The early remote control car anti-theft device is that the host and the remote control each have the same set of passwords, the remote control transmits the password, and the host receives the password, thereby completing the various functions of the anti-theft device. This password transmission method is called the first Generation of fixed code transmission mode (referred to as fixed code transmission mode). The application of fixed code transmission method in automobile anti-theft device is not popular. When the amount of anti-theft device is not large, that is, when it is in an initial anti-theft device application market, the safety and reliability of its anti-theft device are still guaranteed. But for a market where the use of anti-theft devices has matured, the fixed code method appears to be neither* nor safe for three reasons:
(1) The number of passwords is small, and repeated codes are prone to occur, that is, the phenomenon of one remote control controlling multiple vehicles
(2) After the remote control is lost, it is extremely unsafe to replace the remote control alone, unless it is replaced together with the host, but the cost is too high.
(3) The biggest danger is poor security, the password is easy to be copied or stolen, so that the vehicle is stolen.
Code-hopping anti-theft device Fixed-code anti-theft device has long been insecure problems such as small amount of passwords, prone to repeated codes, and passwords are easily copied and stolen. Therefore, in 1996, a password learning-type code-hopping anti-theft device appeared.
Its characteristics are as follows:
(1) In addition to the ID code and instruction code, the password of the remote control has an extra code skipping part. The code hopping means that the password is based on a certain encoding function. Every time it is transmitted, the password changes once. The password will not be easily copied or stolen, and the security is extremely high.
(2) There are hundreds of millions of password combinations, which completely eliminates duplicate codes.
(3) The host has no password, and the host can realize mutual recognition between the host and the remote control by learning the password of the remote control. If the remote control is lost, the remote control can be replaced safely and at low cost without any worries.
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