Why does the remote control key have to be pressed twice to unlock the whole car?

Usually, if you press the following conditions, you will open the main driver's door. If you are afraid that someone will open the door for you when you get on the bus.

Remote control key: it is used to open intelligent door locks by controlling equipment through radio.

The first generation: the traditional mechanical key realizes the basic function of opening and closing the door.

The second generation: the door can be opened and closed by pressing the remote control button lightly, but the car needs a mechanical key to operate, and the two keys are used together, which is indispensable and somewhat cumbersome.

The third generation: the functions of the key and the remote control are combined into one, the door opening/closing/car starting are all completed by the active button, and the remote control key is embedded with the mechanical key for emergency use.

The fourth generation: On the basis of active buttons, the passive working mode is added, and the door opening/closing action can be realized without buttons, so that the efficiency is further improved and the safety performance is greatly improved.

The working principle is simple: firstly, a weak radio wave is emitted from the key, and the car antenna receives the radio wave signal, and the signal code is recognized by the electronic control unit (ECU), and then the actuator (motor or electromagnetic coil) of the system performs the on/off action.