[lunarhighway]

i think there's some posts on active grillblocks and even some examples, yet most use simple but affective manual cable acutation.

some production cars like some bmw also have this system

i'm working myself on a version for my car wich will open or close based on wether the fan is on or not

i'm about 50% done and the machanism is takeing place but it's a long term project

it will consist of a single door revolving around its axis. it will be oppereated by an electric motor that spins an axle, with simultaniously winds and unwinds a string that will pull open/shut the door.

two switchs on either end of the doors travel will detect wether it's open/closed or in between and a fairly simple setup with relais will determine of the motor should spin and in wich direction

after considdering many possibilities the pulley setup came out as best

the small axle makes for a reduction so there's enough torque available, there's also a speed reduction and when the the door is static the wound wire will hold in in that position (hopefully) also the wires will off much flexibility as to where the motor is placed