PCB Assembly of Car Remote Control System

Basic Principle of Car Remote Control Key

The basic principle of the car remote control key involves emitting a weak radio wave from the car owner. The radio signal is received by the car antenna, and the signal code is identified by the electronic controller ECU. Subsequently, the actuator (motor or electromagnetic management ring) of the system performs the opening/closing action.

System Composition

• Main Components: The system is mainly composed of a transmitter and a receiver.

Transmitter

• Components: It consists of a transmitting switch, transmitting antenna (keyboard), integrated circuit, etc.
• Function: It sends out an identification code using short-wave modulation.

Receiver

• Function: After receiving the signal through the car’s short-wave antenna, it uses a distributor to enter the short-wave high-frequency amplifier processor of the receiver electronic control unit for demodulation.

Principle of Automobile Smart Key

The principle of the automobile smart key is mainly composed of two parts: the transmitter and the receiver. It is initiated by the battery and emits a smaller radio wave from the key. The car antenna receives the radio wave signal sent by the key, and the system’s actuator (motor or electromagnetic manager circle) performs the movement/atresia action.

Detailed Introduction to Car Remote Control System

Transmitter Components and Function

• Components: The transmitter consists of a transmitting switch, a launch antenna (keyboard), and an integrated circuit.
• Integration: It is integrated with the signal sending circuit on the keyboard. From identifying code storage circuits to FSK modulation circuit, a single-chip integrated circuit is used.
• Battery: The opposite side of the circuit is equipped with a lithium-type battery.
• Transmission Frequency: Selected according to the country’s radio waves. Generally, 27, 40, and 62MHz can be used.
• Transmission Mode: The transmitton switch sends signals one at a time.

Receiver Function and Workflow

• Reception and Demodulation: The receiver uses FM modulation to send an identification code. It receives the signal through the car’s FM antenna and uses a distributor to enter the FM high-frequency increase processor of the receiver ECU for demodulation.
• Control Circuit: If the code is correct, it enters the control circuit and makes the actuator work.

Working Method

1. Folding Passive Working Method: When the owner enters the inductive area of the key system, touching the door handles sends a low-frequency signal to the key. If the identification information saved in the key matches the signal received, the key is awakened and analyzes the authentication password issued by the car.
2. Signal Encryption: The signals sent by the key are encrypted to improve security.
3. Verification and Action: The car compares the receiving signal with the information saved inside. If the verification is passed, the car will open the door lock. Once the driver enters the car, pressing the startup key starts the car engine.

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