The role and classification of car key chip

When the car key is turned on, the engine control unit (ECU) on the car will send a set of encrypted electronic coded signals to the chip in the car key. Only when the car ECU unit can read the feedback and receive the correct anti-theft The coded signal allows the vehicle to start. Therefore, even a simple car key, without any buttons, can be turned on and off by the internal chip code. Car keys with chips need to be programmed using a special dedicated original matching device.
Used in the automotive field, the chip is called a magnetically coupled forwarding system. Magnetically coupled forwarding systems are passive in nature. The chip itself does not need a constant power supply, so it does not need to be powered on at all times. Just pass in the electromagnetic wave range at the frequency of 125 kHz. Under the electromagnetic wave, the chip will generate the original encoded signal, which is generally in the range of 1 cm to 15 cm. Since this is a radio frequency, it can penetrate the material so that the chip does not need to be exposed, and can be made in the shape of a key head made of plastic or rubber.
The key identification process in most automotive anti-theft system chips is basically similar. When a car chip key is inserted into the ignition lock and turned to the "on" or "running" position, an induction coil is installed around the ignition lock, and an electromagnetic wave is sent out. The winding radiates on the key chip, and the electric power of the electromagnetic wave causes the electronic chip to generate a coded signal. The signal is usually an alphanumeric sequence, which is considered an identification code. The signal is read in the induction coil and sent to an ECU computer to identify the signal. If this signal is confirmed as a signal already in the ECU computer memory, it will be accepted by the ECU computer, and the other electronic components of the ECU controlling the vehicle are set to allow execution, at which time the engine of the vehicle can be started at will.