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With the development of China's economic construction, cars have become an indispensable part of people's lives. Stealing cars has become one of the most common crimes in today's society, which has become a serious social problem. With the increase in the number of cars, the number of stolen vehicles has also increased year by year, fearing that the car will be stolen, becoming the first problem that plagues car users. With the advancement of science and technology, in order to deal with the escalating segment of the car, people have developed anti-theft devices with different structures. Let's talk about the types and applications of car alarms.1 Key-controlled anti-theft system The key-controlled anti-theft system functions: when the driver locks the door, the electronic anti-theft system circuit is turned on, and the electronic anti-theft system begins to enter the working state. Once a thief illegally opens the door, the electronic anti-theft system uses a horn to call for help on the one hand, and cuts off the ignition system circuit on the other hand, so that the engine can not be started, thus playing the role of burglar alarm.
The electronic key coding control device controls the starting of the automobile engine by means of a coded ignition key to prevent the car from being stolen. It is mainly composed of an ignition key of an identity code, a controller composed of an encoder, and an engine control unit. The coded ignition key has a resistor die embedded in it and an identity code (resistance value) in the resistor die. The ignition lock cylinder stores a code. When the inserted key does not match the stored code, that is, the resistance value does not match the resistance value stored in the ignition lock, the ignition system circuit cannot be turned on, thereby preventing theft.
2 The electronic password of the electronic password anti-theft system alarm is the key to unlock the anti-theft device. On the one hand, it records the 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 command code and data code, which is responsible for turning on or off the anti-theft device and controlling all functions of the anti-theft device.
According to different ways of transmitting passwords, remote-controlled car alarms are mainly divided into fixed-type anti-theft devices and code-removing anti-theft devices. Early anti-theft devices mostly use the fixed code method, but because of its easy to be deciphered, it has gradually been replaced by a code-based anti-theft device with more advanced technology and better anti-theft effect. The following describes the principle and characteristics of two different types of anti-theft devices. 1. Fixed code alarm. The early remote-controlled car alarm system has a set of the same password for the host and the remote controller. The remote controller transmits the password and the host receives the password, thereby completing various functions of the immobilizer. This type of password transmission is called the first generation fixed code transmission. Mode (referred to as fixed code transmission method). The application of fixed-code transmission mode in car alarm is not popular. When the amount of anti-theft device is not much, it is in the initial anti-theft device application market, and the safety and reliability of the anti-theft device are guaranteed. However, for an anti-theft device using mature markets, the fixed-code method is neither reliable nor safe. There are three reasons: the number of passwords is small, and it is easy to have duplicate codes, that is, a remote control controls multiple vehicles; After the device is lost, it is extremely unsafe to replace the remote control separately, unless it is replaced together with the host, but the cost is too high; it is also the biggest danger, that is, the security is poor, the password is easy to be copied or stolen, and the vehicle is stolen.
Jump code anti-theft device. Fixed-code anti-theft devices have long been insecure for a small number of passwords, easy to duplicate codes and passwords are easily copied and stolen. Therefore, the code-based anti-theft device came into being. Its characteristics are as follows:
The password of the remote control has more code skipping parts besides the identity code and the instruction code. The code-hopping password is a certain encoding function. Each time it is transmitted, the password changes once, and the password is not easily copied or stolen, and the security is extremely high. The combination of hundreds of millions of passwords completely eliminates duplicate codes. The host has no password, and the host learns the remote controller's password to realize mutual recognition between the host and the remote controller. If the remote control is lost, the remote control can be replaced safely and at low cost without any worries.
3 Remote electronic anti-theft system At present, this electronic anti-theft system is widely used in many original cars equipped with anti-theft systems. The remote electronic anti-theft system utilizes transmitting and receiving equipment, and locks or opens the door by electromagnetic waves or infrared rays, that is, controls the anti-theft system to perform anti-theft or release.
There are many types of remote electronic anti-theft systems. Common electromagnetic remote control electronic anti-theft systems and infrared control anti-theft systems. The remote electronic anti-theft system can quickly and easily lock or unlock the door without the need for light assistance at night.
Structure and composition. A complete remote control car alarm should consist of the following parts:
Host part: It is the core and control center of the anti-theft device. Inductive detection part: It can be composed of an inductor or a probe. Currently, an oscillation sensor is commonly used, and microwave and infrared probe applications are rare. Door control part: including front cover switch, door switch and luggage compartment switch. Alarm part: Horn. Wiring part.
Other parts: including accessories such as stickers, screws and relays, instruction manuals and installation wiring diagrams.
The function of the remote control electric central door lock anti-theft system and the operation of remote control lock and anti-theft settings. Press the corresponding button on the remote control, the four turn signals flash once, indicating that the driver's door and luggage compartment are locked. The anti-theft status indicator flashes slowly, indicating that the driver has entered the anti-theft state. In this state, both the starting and ignition power sources are cut off.
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