What are the main types of automobile anti-theft alarm devices?

1. Several main types of common automobile anti-theft devices

According to its structure, ordinary automobile anti-theft devices can be divided into three categories: mechanical, electronic and network.

1) mechanical type

Mechanical anti-theft devices are anti-theft locks made of various metal materials, including steering column lock, steering wheel lock, gear lever lock, pedal lock (clutch pedal lock, brake pedal lock), wheel lock, etc. These anti-theft locks can lock the operating parts of the car so that thieves can't drive the car away. The burglar alarm is simple and cheap, but it can't give an alarm automatically.

2) Electronics

Electronic burglar alarm, also known as microcomputer burglar alarm, mainly includes plug-in, key-press and remote control. The burglar alarm controls the starting and ignition circuit of the car through electronic equipment. After the whole system is turned on, if the car is illegally moved, and the door, fuel tank door, engine cover, trunk cover and contact fuse are opened, the anti-theft device will give an alarm immediately, the lights will flash immediately, and the whistle will sound loudly. At the same time, the starting circuit, ignition circuit, fuel injection circuit, oil supply circuit and even automatic transmission circuit will be cut off, so that the car will be completely paralyzed. The anti-theft device has hidden installation, complete functions, wireless remote control and simple operation, and is widely used in mid-to high-end cars at present.

3) Network type

Network car anti-theft system is an advanced anti-theft method popular in the world at present. It is a new type of automobile anti-theft method after fully summarizing the problems existing in the previous anti-theft methods. Mainly through global satellite positioning and GSM wireless transmission, the car is located, tracked and robbed (CAS anti-theft system), commonly known as "ground network". The biggest advantage of this anti-theft system is that it changes the single technical defense function of the traditional anti-theft device, but increases the civil air defense function. It can give an alarm to the vehicle in time, and track and locate it through the "net" built in the sky and on the ground, thus making it possible for the police to quickly chase and block the stolen vehicle. Moreover, this anti-theft system has anti-theft and anti-robbery functions such as blocking oil and circuits, which leads to the car stalling and parking.

2. Several main types of remote control car burglar alarm.

According to the different password transmission modes, the remote control car burglar alarm is mainly divided into two types: fixed code burglar alarm and code hopping burglar alarm. In the early days, fixed code burglar alarm was mostly used, but due to its own shortcomings, it has been gradually replaced by code hopping burglar alarm with more advanced technology and better burglar alarm effect. The principles and characteristics of two different types of burglar alarms are introduced below.

Fixed code burglar alarm The early remote control car burglar alarm was that the host and the remote controller each had the same set of passwords. The remote controller sent the password and the host received the password, thus completing various functions of the burglar alarm. This password transmission mode is called the first generation fixed code transmission mode (hereinafter referred to as fixed code transmission mode). The application of fixed code emission method in automobile burglar alarm is not popular. When the amount of burglar alarm is small, that is, it is in the primary burglar alarm application market, the safety and reliability of burglar alarm are still guaranteed. However, for the mature market where burglar alarms are used, this coding method is neither reliable nor safe for the following reasons:

① The number of passwords is small, and it is easy to have duplicate codes, that is, one remote controller controls multiple cars;

(2) After the remote control is lost, it is extremely unsafe to replace the remote control alone, unless it is replaced with the host, but the cost is too high;

③ The biggest danger is poor security, and the password is easy to be copied or stolen, thus making the vehicle stolen.

Due to the unsafe problem of fixed password burglar alarm, a code-skipping burglar alarm for learning password appeared in 1996, and its characteristics are as follows.

(1) The password of the remote controller has an extra code skipping part besides the ID code and the instruction code. According to a certain coding function, the password of the code hopping machine changes randomly during each transmission, so the password will not be easily copied or stolen, and the security is extremely high.

(2) Hundreds of millions of password combinations eliminate duplicate codes.

③ The host has no password, and the host learns the password of the remote controller to realize mutual recognition between the host and the remote controller. If the remote control is lost, it can be replaced safely and at low cost, without worries.