Control systems Flashcards
what are control systems
one or more devices that guides other devices or systems
what does a control system allow to happen
completion of various tasks in an automatic manner
what may control systems include and why?
sensors to gain feedback from the environment
motors to control any actuators
give an example of a control system
automatic doors that can be found in supermarkets - sensor may use infrared or microwave signals that bounce off objects to detect motion
sensor forwards its signals to the microprocessor and allows the control system to operate the actuator to open the doors
what is an interrupt
signal sent to the control system indicating that the system needs to pay attention to the specific signal immediately
what is process control
control of one or more variables in a system
what are the two different types of controllers
open, closed controllers
what are device drivers
computer programs used to control a computer device of any kind - eg. keyboards, printers etc
what do device drivers allow
allows the operating system and other programs to access the devices with a layer of abstraction
what features make a device driver as efficient as possible
hardware-dependent,
operating system specific
control system in heating system
sensors allow the control system to measure the temperature of the environment and detect any action they need to perform to reach a desired temperature
what does heating control system enable
allows conservation of energy
more efficient than manually turning on and off a heating system
control system in taxi meter
seat sensors detect presence of passengers to prevent passenger journeys that don’t operate the taximeter
control system in elevators
a weight sensor might exist that tells the control system how full the car is
a motion sensor is used to prevent the door from closing when people are entering/leaving
how is an interrupt used in elevators
a stop button stops the elevator from moving in emergency situations - this button sends an interrupt signal to the processor of the control system
control systems in washing machines
sensors used to determine load size, water level, temperature, user interface
door is locked by a computer system
domestic robots control system
uses sensors to map and find their way through the rooms
cameras to create house maps and know their current and previous location
sensors detect the material the robot is on
control systems in GPS
includes sensors that locate satellites , figures out its distance to each one, calculates the time difference and uses trilateration to deduce its location
two different types of control systems in traffic lights
fixed time
dynamic control
what is fixed time system in traffic lights
open loop control systems - do not receive any feedback from the environment
configured to change color after a given period of time
what is dynamic control system in traffic lights
closed loop control systems - provides feedback on the amount of traffic passing by
uses two different types of sensors that detect traffic condition: embedded into surface of the road, mounted on traffic light
