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What is the Principle of Car Remote Door Locks?

1 Answers

VanIsabela

07/30/25 8:08am

Car remote door locks operate on the basic principle of transmitting a weak radio wave from the owner's vicinity, which is received by the car's antenna. The electronic control unit (ECU) then identifies the signal code, and the system's actuator (either a motor or an electromagnetic coil) executes the locking or unlocking action. This system primarily consists of two main components: the transmitter and the receiver. Expanded explanation: 1. Transmitter: The transmitter is composed of a transmission switch, transmission antenna (keypad), integrated circuit, and other components. It is integrated with the signal transmission circuit on the keypad. From the identification code storage circuit to the FSK modulation circuit, the use of a single-chip integrated circuit enables miniaturization. On the opposite side of the circuit, a button-type lithium battery is installed. The transmission frequency is selected based on the radio wave band used, typically utilizing the 27, 40, or 62 MHz bands. Each press of the transmission switch sends a signal once. 2. Receiver: The transmitter uses FM modulation to send the identification code, which is received by the car's FM antenna and enters the FM high-frequency amplification processor of the receiver ECU via a distributor for demodulation. The demodulated identification code is then compared with the stored code; if it matches, the control circuit is activated, and the actuator operates.

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