Working principle of car alarm

The working principle of the car alarm is that if someone hits, hits, or moves the car, the sensor will send a signal to the controller to indicate the intensity of the vibration. According to the intensity of the vibration, the controller will issue a warning or sound the alarm principle.

The working principle of the car alarm is that if someone hits, hits, or moves the car, the sensor will send a signal to the controller to indicate the intensity of the vibration. According to the intensity of the vibration, the controller will issue a warning or sound the alarm principle.

The sensor has only three main components:

The central electrical contact element located in the cylinder chamber is located at the bottom of the cylinder chamber. Several secondary electrical contact elements are located at the bottom of the cylinder chamber. The metal ball can roll freely in the cylinder chamber. At any equilibrium position that may occur, the metal ball will contact the central electrical contact element and a smaller one. The secondary electrical contact element. This forms a closed circuit through which the current will flow to the controller. Each secondary electrical contact element is individually connected to the controller in this way.

When you knock or shake the sensor to make the sensor vibrate, the ball will roll in the cylinder chamber. When it rolls away from a smaller secondary electrical contact element, the circuit formed by this secondary electrical contact element and the central electrical contact element will be disconnected. At this time, the switch will be turned on, indicating that the controller ball has shifted. When the ball continues to roll past other secondary electrical contact elements, the circuit will continue to close and open until the ball finally stops rolling.

If the vibration of the sensor is increased, the ball will roll longer and will pass through more secondary electrical contact elements before it stops rolling. If this happens, the controller will receive short-time pulse currents from all individual circuits. The controller can measure the vibration intensity according to the amount and duration of the received pulse current. If the ball only rolls from one contact element to another, the controller may not trigger an alarm at all. If someone hits the vehicle and causes a large displacement, the vehicle may issue a warning signal: the horn will sound or the headlights will flash. If the ball rolls for a long distance, the controller will sound the alarm.

Many advanced alarm systems use vibration sensors as the first anti-theft device, but they are usually used in conjunction with other devices. In the next section, we will learn about other types of sensors that can send signals to the controller.

Many cars are equipped with alarm devices, which can send out effective alarm signals. At least when the sensor detects someone stolen the car, most car alarm systems will sound the horn and flash the headlights to alert. Some alarms can also automatically turn off the ignition starter, cut off the fuel supply line of the engine, or make the vehicle unable to start by other means.

An advanced alarm system should also include an independent alarm, which can emit a variety of cold alarm sounds. A lot of noise will make people notice car thieves, so most car thieves will quickly flee the scene when the alarm sounds. Some alarm systems have the function of setting the alarm sound. You can select unique attributes so that they will not be confused with other vehicles.

There are also alarm systems that can play recorded warnings when someone is too close to the vehicle. The main purpose is to allow car thieves to warn them that your car is equipped with an advanced alarm system before the theft. In most cases, habitual offenders will ignore this warning, but for amateur car thieves who try their luck, it will act as a strong deterrent. In a sense, this gives the alarm system the power to deter criminals. Inadvertently, your car has become more than just a stack of components, it has become a well-equipped intelligent machine.

Many alarm systems are also equipped with built-in radio receivers and portable key fob radio transmitters connected to the controller. In the following, we will understand the role of these components in the security device. Most car alarm systems are equipped with a radio transmitter that can be hung on the key chain. Through this device, you can send instructions to the controller to remotely control the alarm system. The working principle of the radio transmitter on the car alarm system is the same as that of the radio remote control toy. It sends a specific signal by pulse modulation of radio waves. The main function of the key chain transmitter is to switch the alarm system. After you leave the vehicle and close the door, you can press the button to activate the alarm system; when you return to the vehicle, you also only need to press it to turn it off. In most systems, when the vehicle alarm system is activated or deactivated, the controller will issue instructions to flash the lights and sound the horn. This is to let you and the people around you know that the alarm system has been activated.

This innovative technology makes the use of the alarm system more convenient. Before the invention of the remote transmitter, the alarm system was activated using a delay mechanism. The principle is similar to that of a household anti-theft alarm. When the car is stopped, you leave the car and lock the door. The alarm system will automatically activate after 30 seconds. When unlocking the vehicle, you need to get in the vehicle first, and then turn off the alarm system within 30 seconds. There is a big problem with this system: due to the delay mechanism, car thieves may enter the vehicle before the alarm is activated and turn off the alarm.

You can also open the electric car door lock through the remote transmitter, turn on the lights and turn off the alarm system before entering the vehicle. Some alarm system controllers are more powerful. They are equipped with a central computer and a built-in paging system. If car thieves attack your vehicle, the central computer will connect to the key chain paging system and report to you which sensors the car thieves have triggered. With the most advanced alarm system, you can give a command to the controller to signal it to shut down the engine.

Since the transmitter controls your alarm system, the pulse modulation mode must act as a key. For a certain series of sensing devices, there may be millions of different pulse codes. This can ensure that the command signal you send to the alarm system is unique, and other people cannot control your vehicle using other transmitters. This system is very effective, but not absolutely safe. If the criminal has been planning to steal your vehicle for a long time, he can use the code extractor to copy your "key". The code extractor is a radio receiver that can sensitively capture the signal sent by the transmitter, receive and record the code. After the car thief intercepts your "unlock code", you can use this code to make a transmitter that accurately mimics your unique signal. With this duplicated key, the car thief can completely bypass the alarm system and steal your car the next time you leave the vehicle.

In order to solve this problem, the more advanced alarm system will set a new code every time it is started. Through the cyclic code algorithm, the receiver encrypts the new unlock code before transmitting it to your transmitter. Since a set of unlocking codes will only be used once, any information intercepted by the code extractor is unintentional.

From the 1990s to the present, automobile alarm systems have developed rapidly and have become more widely used. In the next ten years, we believe that car alarm systems will use more high-tech. Car GPS receivers have opened up a broad space for the security field. If the receiver is connected to the alarm system controller, the location of the vehicle can be reported to the owner or the police at any time. In this way, even if the car is stolen, it can be retrieved quickly.

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