Confusion in understanding control system?

I am learning basics of control systems from following link

http://instrumentationandcontrollers.blogspot.com/2010/11/types-of-control-systems.html

It says that automatic washing machine & traffic signal system are example of open loop system. It does not gives detail why??

Despite the fact that "automatic" appears before washing machine

Also please kindly find attached photo of a common door closer. What type of control system is being used by it?open loop or close loop?

Answer

Both, the automatic washing machine and the traffic signal system are open-loop for the same reason the website mentions for the home heating system.

An open-loop system usually has a timer which instructs the system to switch on the furnace for some time and then switch it off.

The Washing machine uses a timer to turn on and turn off washing and drying without measuring how washed or dried the clothes are.

The traffic light uses timers to switch lights without measuring how many cars are actually on the road.