The basic principle of a car remote control key is that the car owner emits a weak radio wave, the car antenna receives a radio signal, the electronic controller ECU recognizes the signal code, and then the system of the actuator (motor or electromagnetic management ring) performs opening/closing. get some action. The following is a specific introduction:
1. The system mainly consists of a transmitter and a receiver.
2. Emitter: composed of a transmission switch, a transmission antenna (keyboard), an integrated circuit, etc.
3. Receiver: The transmitter uses shortwave modulation to send out identification codes, which are received through the shortwave antenna of the car, and then enter the electronic control unit of the shortwave high-frequency amplification processor of the receiver through the distributor for demodulation.
The principle of a car smart key mainly consists of two parts: a transmitter and a receiver. It is powered by a battery and emits smaller radio waves from the key. Then the car antenna receives the radio wave signal emitted by the key. Code, and then the system's actuator (motor or electromagnetic manager coil) performs motion/locking actions.
The basic principle of a car remote control key is to emit a weak radio wave from the owner, receive the radio signal through the car antenna, recognize the signal code by the electronic controller ECU, and then the system's actuator (motor or electromagnetic manager coil) performs opening/locking. get some action. The system mainly consists of a transmitter and a receiver: 1. The transmitter consists of a transmission switch, a transmission antenna (keyboard), and an integrated circuit. It is integrated with the signal sending circuit on the keyboard. From the identification code storage circuit to the FSK modulation circuit, microcontrollers are used for miniaturization, and a lithium battery is installed on the other side of the circuit. The transmission frequency is selected based on the national radio wave. Generally, 27, 40, and 62MHz can be used. The transmission switch is sent once at a time. 2. The receiver transmitter uses FM modulation to send the identification code, which is received by the car FM antenna and demodulated by the FM high-frequency amplification processor of the receiver ECU through a distributor; If the password is correct, enter the control circuit to make the actuator work. Working mode: 1. Folding passive working mode. When the car owner enters the sensing area of the key system, as long as they touch the door handle and lower it, the identification "key" will receive the low-frequency signal sent by the car. If you receive this signal and the 'key'. The identification information stored in the middle is consistent, and the 'key' will be awakened. The 'key' will parse the authentication password issued by the car and emit the corresponding signal when awakened. These signals are encrypted to improve security. The car will compare the received signal with the information stored in the car. If the verification is successful, the car will unlock the door. After the driver enters the car, simply press the start button and the car engine will start.
