Cover plate control device and automobile

A fuel filler cap actuator, comprising:

• a screw shaft,
• a rotor,
• a housing,
• a first reset spring,
• a lock block and
• a lock block driving device;
• wherein
• the housing comprises a guide sleeve;
• the screw shaft is mounted within the guide sleeve;
• the rotor is attached to a bottom of the screw shaft;
• the guide sleeve is provided with a deep guide slot and a shallow guide slot, the deep guide slot and the shallow guide slot both extend upwards beginning at a bottom of the guide sleeve;
• a dedendum flank is located in between openings of an adjacent deep guide slot and the shallow guide slot;
• a top of the lock block comprises an addendum flank which corresponds to the dedendum flank;
• a side of the rotor extends out of a protruding block;
• the protruding block is located between the bottom of the guide sleeve and the top of the lock block;
• a lower end of the first reset spring is affixed to the housing;
• an upper end of the first reset spring is attached to the screw shaft;
• under the action of the lock block driving device, the lock block can be rotated between a locking angle and an unlocking angle;
• while the lock block is rotated to the locking angle, a gap distance or a gap shape between the dedendum flank and the addendum flank blocks the protruding block, preventing the protruding block from sliding between the deep guide slot and the shallow guide slot;
• while the lock block is rotated to the unlocking angle, the gap distance or the gap shape between the dedendum flank and the addendum flank allows the protruding block to slide between the deep guide slot and the shallow guide slot.