# Identification of control system type? Open loop or close loop,

What is the type of control system of door closer in attached photo?

• If I put that picture and question together on a test, it would be an essay question, I'd ask the student to justify their conclusion, and I'd be using the justifications to assess the student's understanding of what a control loop is. Bet me \$20 that it's one, and I'll give you a convincing argument why it's the other. Sep 5 '19 at 0:26

This a spring loaded dampening system that one can describe in a form of $$\ddot{x} + 2 D \omega_{0} \dot{x} + \omega_{0}^2= 0$$