The principle of the car key, the principle of the car remote control key.

1. Transmitter.

The transmitter is composed of a transmitter switch, a transmitter antenna (key board), an integrated circuit, etc. It is integrated with the signal transmission circuit on the key board. From the identification of the ** memory circuit to the FSK modulation circuit, the lithium battery of the button type is installed on the opposite side of the circuit due to the miniaturization of the use of a single-chip integrated circuit.

The transmission frequency is selected according to the radio wave of the country of use, and the MHz frequency band can generally be used. The transmitter switch sends a signal once every push of the button.

2. a receiver.

The transmitter uses FM modulation to send out identification**, receives it through the FM antenna of the car, and uses the FM high-frequency amplification processor of the distributor to enter the receiver ECU for demodulation, and compares it with the identification ** of the demodulator; If it is correct**, enter the control circuit and make the actuator work.

Working mode: 1. Folded passive working mode.

When the owner enters the sensing area of the key system, as long as the hand touches the door handle, the identification "key" it carries will receive the low-frequency signal sent by the car, and if this signal is consistent with the identification information stored in the "key", the "key" will be awakened. When the "key" is awakened, it analyzes the authentication password issued by the car and sends corresponding signals, which are encrypted to improve security. The car compares the received signal with the information stored inside the car, and if the verification is successful, the car unlocks the door.

Once the driver is in the car, he only needs to press the start button with a simple press and the car engine will start. When the button is triggered, the PKE system first needs to detect whether the "key" device is in the car, and then complete the same authentication process before starting the engine. When the driver leaves the car, the door is locked by simply pressing the door handle, and the car is also subject to the same detection of the driver's position before the car is actually locked, and goes through the same verification process.

2. The working mode of folding coil induction.

It is mainly by placing an encrypted chip inside the key, and in the process of unlocking, the radio frequency transceiver of the body verifies whether the key matches to determine whether the engine can be started. It is mainly used for special situations when the key is out of power, and the car can still start normally.

3. Collapse active working mode.

The principle is to control the door through the body electronic module (ECU, electronic control unit) and the body control module (BCM, body control management), just press the key button to send the unlocking and locking command, and after the verification of the body electronic module, the door can be opened and closed.

Hello, how to reset the car key system failure, there are the following methods:

1. If the car remote control key fails, first consider whether the battery is dead.

Different brands of car remote control key structure is different, according to their respective structure, remove the key cover, find the location of the battery, and replace the battery. When removing the key cover, do not use too much force, so as not to damage the outer cover and cause subsequent sealing problems of the key cover.

2. When replacing the battery, gently wipe the dust of the inner base with an alcohol cotton pad.

After the car key has been used for a long time, there will be some dust or dirt inside, and the keys will gradually become insensitive, so you can gently wipe the internal key base with an alcohol cotton pad. Be careful not to touch the internal circuit structure when wiping to avoid circuit failure.

3. After installing the battery, test the remote control key function of the car.

After installing the battery and cleaning the key dust according to the above steps, install and fix the car key cover, test the remote control key function, and if it can be used, it means that it has returned to normal.

4. If the car remote control key is still out of order, it is recommended to go to the car 4S shop for repair.

If the car key fob still does not work after testing, it may be that the circuit board is not in good contact or there is another fault. The internal design of the car remote control key is fine, and most car owners do not have suitable maintenance tools, so it is recommended to go to a professional car 4S shop for maintenance.

Hope it helps!

When the driver locked the door, the electronic anti-theft system circuit was connected, and the electronic anti-theft system began to enter the working state. Once a thief illegally opens the car door, the electronic anti-theft system uses the horn to alarm for help on the one hand, and cuts off the ignition system circuit on the other hand, so that the engine can not start, so it plays the role of anti-theft alarm.

The electronic key coding control device relies on the coded ignition key to control the start of the car engine to prevent the car from being stolen. It is mainly composed of the ignition key of the identity **, the controller composed of the encoder and the engine control unit.

The coded ignition key is embedded with a resistance die with an identity** (resistance value) inside the resistance die. When the inserted key does not match the stored **, that is, the resistance value does not meet the resistance value stored in the ignition lock, the circuit of the ignition system can not be turned on, thus playing an anti-theft role.

First, the principle of the car remote control key:

1) The system is mainly composed of two parts, the transmitter and the receiver, initiated by the battery, the radio wave with small fluctuations is emitted from the key, and then the car antenna receives the radio wave signal sent by the key, and the special signal is identified by the electronic controller ECU, and then the actuator (motor or electromagnetic manager circle) of the system performs the action of opening and locking.

Second, the remote control key needs a battery, and different remote control keys use different batteries.

By the car owner pressing the button on the key, the key end sends out a signal, and the signal contains the corresponding command information, and the antenna of the car end receives the radio wave signal, and after the body control module BCM certification, there is an actuator to realize the action of unlocking and locking.

Advantages: Regardless of day or night, there is no need to detect the keyhole, and it can be unlocked (opened) and locked (locked) from a distance and conveniently.

The wireless remote control function of the door lock means that the door can be opened and locked from a distance without inserting the key key into the lock hole.

First, the principle of the car remote control key:

The system is mainly composed of two parts, the transmitter and the receiver, initiated by the battery, the radio wave with small fluctuations is emitted from the key, and then the car antenna receives the radio wave signal sent by the key, and the special signal is identified by the electronic controller ECU**, and then the actuator (motor or electromagnetic manager circle) of the system performs the action of opening and locking.

Second, the remote control key needs a battery, and different remote control keys use different batteries.

The hidden function of the key fob.

1. Easy to open and close the windows.

Press and hold the unlock button on the remote control key, and the four-door window of the vehicle will be automatically lowered, and the sunroof of some models will also be lifted up and opened at this time; Press and hold the lock button on the key fob, and the vehicle's four-door windows and sunroof will close automatically.

It should be noted that if you release the button while the window is lowering or rising, the window that is normally lowering or rising will stop at its current position.

2. Key battery.

Press any button on the key fob, if the light on the key is not on, the battery needs to be replaced. It should be noted that improper battery replacement may damage the key fob, so be sure to replace it with a new battery with the same rated voltage, size and specifications.

3. Turn off the keyless system.

For vehicles equipped with keyless entry, the sensing area on the door handle automatically closes if the vehicle is not unlocked or locked for an extended period of time.

The basic principles of remote control are:A weak radio wave is emitted from the side of the car owner, and the radio wave signal is received by the car antenna, and the signal is identified by the electronic controller ECU**, and then the action of opening and locking is carried out by the actuator (motor or electromagnetic manager circle) of the system.

When the modern lock receives the correct ** signal, the control wave receiving circuit is triggered to the reception time and then returns to the standby state. If the input ** signal does not match, the receiving circuit will not be triggered. If there are more than 10 ** signal inputs within 10min, the lock thinks that someone is trying to steal the car, so it stops receiving any signal, including receiving the correct ** signal, in this case, the owner must mechanically insert the door lock hole with the key to open the door.

The recovery of signal reception can be started by key ignition and the main switch of the remote control door lock system can be turned off and then opened, if the door is unlocked by the remote control mechanism within 30s, the door will be automatically locked.

Generally, we have two ways to get car keys:

One is to the 4S store, and the other is to the auto parts city. Obviously, the biggest difference is ** and time-consuming. In the 4S store, the general remote control key is at least 1,000 yuan, and the high-end model will be more expensive, and in terms of time, the 4S store will also take some time.

The auto parts city key is usually faster and more efficient, about a few hundred pieces.

The car remote control key refers to the wireless remote control function of the central lock. The owner does not need to insert the key key into the lock hole to open the door and lock the door from a distance, and its biggest advantage is: no matter day or night, there is no need to find the lock hole, and it can be unlocked (opened) and locked (locked door) from a distance and conveniently.

Basic principle. A weak radio wave is emitted from the key, and the electric wave signal is received by the car antenna, and the signal is identified by the electronic controller ECU**, and then the actuator (motor or electromagnetic manager circle) of the system performs the action of opening and locking. The system is mainly composed of two parts: a transmitter and a receiver.

It definitely needs a battery, he is like a remote control, giving a specific signal to the receiver on the car, and the receiver receives the signal to the ECU of the car, and then the ECU will give instructions to unlock the lock. The general principle should be like this.

The battery is definitely there without the battery and it will not emit the remote control wireless frequency.

The anti-theft key chip is actually RFID, in fact, it is a non-contact card system (there are also contact types not discussed here), he is a radio frequency system, the electricity on the chip is obtained by radio frequency induction, the principle of microwave induction is used at high frequency, and the principle of electromagnetic induction is used at low frequency, after induction, the chip sends its own information back. At present, according to international standards, RFID has a distance of about 900M and a distance of about 5 meters, a distance of about 20 cm for 13M, and a distance of about 1 cm for 125K. There is also a domestic standard of 433m.

125k now only used in cars, no other places are used, it is the original product, such as car bus cards and so on are 13m. At present, the old key principle is tested on the market, but the chip distance is not enough, because the coil reader is embedded in it, and the old key cannot be done.

Inside the key there is a decoding chip. Also known as anti-theft chips. The chip in each car corresponds to the ignition system of the engine. The car will only be started after a relative check.

There is an anti-theft chip in the key, and there is an induction coil outside the ignition lock, and the data in the chip will be read when the electric door is opened.

The steering wheel of the car is locked: the left hand holds the steering wheel and shakes slightly, and the right hand shakes the key at the same time. 2. Basic principles of car keys:

A weak radio wave is emitted from the owner's side, and the car antenna receives the radio wave signal, and the electronic controller ECU identifies the signal**, and the system actuator performs the action of opening and locking. The car key is a wireless remote control function that uses the central lock's spine number, and can open and lock the door from a distance without inserting the key key into the lock hole. Here's an extension of how to light a car key:

1. Active: Take the initiative to work in a wild way. 2. Passive:

Passive way of working. 3. Coil induction: macro head coil induction mode.

The principle of the car remote control key is mainly composed of two parts of the transmitter and the receiver, initiated by the battery, the radio wave with small fluctuations is emitted from the key, and then the car antenna receives the radio wave signal sent by the key, and the special signal is identified by the electronic controller ECU, and then the actuator of the system (motor or electromagnetic manager circle) performs the action of opening and locking.

Second, the remote control key needs a battery, and different remote control keys use different batteries.

Car remote fob:

1) The remote control key (RKE) brings a good user experience to people and meets people's requirements for convenience and comfort, but due to the technical limitations of its RF one-way communication, it has its own shortcomings in security.

2) NXP Semiconductors timely launched the integrated solution (combi) to combine engine anti-theft and remote control key into one, with a chip to realize, not only improve the security of the system, but also reduce the cost of the entire key, and gradually replace the independent remote control key to become the mainstream in the European, American and Japanese markets.

3) In 2003, NXP launched the keyless system (PKE or PEPS), which completely changed the development of automotive security applications, and brought users a new comfortable and convenient experience: the owner does not need to use the key during the whole driving process, and only needs to carry the solution with him. Of course, in terms of radio frequency communication, it still retains one-way communication, and the security is not substantially improved.

4) When the owner enters the effective range near the car, the car will automatically detect the key and identify it, and if successful, the door or trunk will be opened accordingly; When the owner enters the car and brings it into the car, he only needs to press the engine start button, and the car will automatically detect the position of the key, determine whether the key is in the car, whether it is in the main driver's position, and start the engine if successful.

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