The “Proportional-Integral-Derivative Controller”, known as PID controller, is used to balance a million things like drone motors, air contitioners, assembly line robotic arms, and chainsaws.
It can be made to work electronically, pneumatically, or mechanically.
It - and partial versions of it (like a PD Controller) - was independently invented multiple times throughout history:
windmills in 17th century france to regulate pressure based on wind speed
factory steam engines to regulate fuel consumption based on load (Centrifugal Governor - invented twice)
the 19th century Whitehead Torpedo to reach and maintain depth
The “Proportional-Integral-Derivative Controller”, known as PID controller, is used to balance a million things like drone motors, air contitioners, assembly line robotic arms, and chainsaws.
It can be made to work electronically, pneumatically, or mechanically.
It - and partial versions of it (like a PD Controller) - was independently invented multiple times throughout history: