Central locking

The central control lock refers to a switch provided on the driver's seat door and is a control device that can simultaneously control the closing and opening of the entire vehicle door.

This "central lock" control device, which was already installed on cars as early as the 1970s, has been used more commonly for more than 20 years.

The central door lock uses a switch to control the other switches. The actuators are divided into two types: one is in the form of a solenoid coil and the other is in the form of a DC motor. Both forms change the direction of motion of the object by changing the polarity of the direct current, and perform the closing or opening action.

At present, the central locking of cars is mostly electromagnetic coil type. Its working process is this:
Lock the door: When the electromagnetic coil is carrying forward current, the armature drives the connecting rod to move to the left and buckles the door lock tongue.
Open the door: When the electromagnetic coil is reversed, the armature drives the connecting rod to move to the right to disengage the door lock tongue.

The working principle of the DC motor type is that the connecting rod driving force is provided by the reversible DC motor, and the forward and reverse rotation of the motor is used to complete the actions of locking the door and opening the door.

The universal application of centrally controlled locks in vehicles has made the vehicle a step toward intelligent and humanized development. This allows the driver to easily control the opening and locking of the entire vehicle door without leaving the seat. However, the application of central locking in the car also brings some problems. First, after the driver opens the driver's side lock, the rest of the door lock is automatically opened. If you drive alone and have valuables on the front passenger seat or the back seat, you may be robbed and stolen. In addition, the central locking is designed for the driver's convenience. After the driver locks the door. The rest of the doors cannot be opened from the outside of the car. Passengers must have the driver open the lock again when getting on the train. This will cause passengers to feel inconvenient and create unnecessary embarrassment.