What Is a Keyless Entry Remote?

Car keyless entry system, referred to as PKE (PASSIVE KEYLESS ENTER). This product uses the world's most advanced RFID radio frequency technology and the most advanced vehicle identification code identification system. The successful integration of the remote control system and the keyless system, the traditional vehicle circuit protection is inherited, and the dual radio frequency system and the dual anti-theft protection are truly realized, providing convenience and security for the vehicle owner to the greatest extent. "Car keyless system" is not a traditional key, but a smart key, or smart card. If your car is a high-end model, you use this key when you open the door.

Car keyless entry system

Car keyless entry system, referred to as PKE (PASSIVE KEYLESS ENTER). This product uses the world's most advanced RFID radio frequency technology and the most advanced vehicle identification code identification system. The successful integration of the remote control system and the keyless system, the traditional vehicle circuit protection is inherited, and the dual radio frequency system and the dual anti-theft protection are truly realized, providing convenience and security for the vehicle owner to the greatest extent. "Car keyless system" is not a traditional key, but a smart key, or smart card. If your car is a high-end model, you use this key when you open the door.

Chinese name

Car keyless entry system

Foreign name

PASSIVE KEYLESS ENTER

Short name

PKE

Category

system

Renault, Mercedes,

1. Keyless entry function:

a) When the key is close to the vehicle body, the door automatically unlocks and the anti-theft alarm state is released, and the direction indicator flashes twice; when the key leaves the vehicle body, the door automatically locks and enters the anti-theft alarm state. At this time, the turn signal flashes once, A short horn

b) The effective detection distance of the main door is not less than 1.5m, and other door keys are valid when they are near the door.

2. Automatic window lift and fortification function:

a) When the key is 3-5 meters away from the car body, the door is automatically locked and enters the state of anti-theft alert. At this time, the turn signal flashes once and the horn sounds a short sound;

b) The window will automatically rise (this function depends on the brand and model specifications).

3.Wireless remote control function:

a) Remote lock: Press this button to lock the door, the direction indicator flashes once, and the horn sounds at the same time, the car enters the alarm state;

b) Remote unlocking: Press this button to unlock the door, blink the turn signal twice, and release the alarm status at the same time;

c) Car search function: press this button, the electronic horn sounds 8 times, and the turn signal flashes 8 times; if the host detects the key or receives the door open signal, it will automatically terminate the car search function (this function depends on the brand and model specifications);

d) The wireless remote control distance is not less than 20 meters;

4. Anti-theft alarm function:

a) In the state of anti-theft alert, if the side door trigger or ACC signal is triggered, the system will start to alarm. At this time, the electronic horn will beep for 30 seconds and the direction indicator will flash for 3 minutes;

b) Once the anti-theft is triggered, the system must cut off the startup circuit and the oil circuit, and it can be restored only after the anti-theft is removed;

c) If the door is not closed properly after the anti-theft alarm is activated, the system sends out a warning signal: the electronic horn beeps 8 times and the direction indicator flashes 8 times; if the door is still not closed after 5 seconds, the oil circuit and the Starting circuit

5. Other functions:

a) Low battery reminder of the remote control: When the battery of the remote control is too low, the horn will beep 4 times when there is no key or the remote control opens or closes the door;

b) Online diagnosis: can detect system failures online and upgrade system settings online.

c) Power saving mode: The system adopts automatic wake-up mode control. When the remote control enters the radiation field of the car antenna, the remote control is automatically awakened. When leaving, the remote control enters the sleep state and can automatically enter the power saving mode.

Case number one:

Engine anti-theft locking system (IMMO) ^[2]

By installing a chip in the ignition key, each chip is equipped with a fixed ID, and the car can start only when the ID of the key chip matches the ID of the engine. If not, the engine will not start. When the owner turns the key to start the vehicle, the base station sends a low-frequency signal to start the authentication process. The working energy of the key-end transponder is provided by the low-frequency signal of the base station. During the authentication process, the transponder placed in the key first sends its own ID number. After verification by the base station chip, the base station will send out a string of random numbers and MAC addresses and respond at the same time. Device responds. In order to improve security, each signal sent is encrypted data.

IMMO mainly controls the engine through the engine control unit ECU. The entire solution includes a low-frequency transceiver, MCU, voltage regulator, and communication interface chips (such as CAN and LIN transceivers). Restricted by size, NXP has introduced a new generation of single-chip solutions {ABIC2}, implementing these chips with a dedicated IC. It includes LIN transceiver, voltage regulator and digital logic unit. It realizes single-chip remote ECU communication. Only three wires (Power, GND and LIN) are needed to realize the IMMO function.

Base station chip PCF7991 near the ignition lock + transponder PCF7936 in the key.