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In the picture above, you can see two cables connected to a pivot that moves the throttle valve. Note that we have used the MATLAB feedback command to simplify the block diagram reduction of the closed-loop system. What is a closed loop control system and how does it work? It mainly reduces the driver's fatigue during long trip. Many cars are fitted with cruise control that, at the press of a button, automatically maintains a set speed. However, this new system can automatically adjust speed in order to maintain a proper distance between vehicles in the same lane. This is a system that automatically controls the speed of an electric vehicle despite external disturbances. ?&:2Pug&*0D;Bha>?t'.VPM.LK4'7M9d k u EyVdd /Z For this example, let's assume that the parameters of the system are. 0000000711 00000 n A classic example of a closed loop control system is Cruise Control in your car. than 5 seconds. This figure can describe a variety of control systems, including those driving elevators, thermostats, and cruise control. On the other hand, closed loop control is like using cruise control. Briefly describe how cruise control in a car acts as a closed-loop system. When the sensor detects the temperature is above the set point, it turns the system off. Home Open Loop vs. Closed Loop Controls. 20. The transfer function in the plant is the transfer function derived above {Y(s)/U(s)=1/ms+b}. What Is a Closed Loop Cruise? If you start going up a hill and slowing down, or down a hill and speeding up, your Cruise Control constantly measures the difference between COMMAND and FEEDBACK and makes the change to the gas pedal in real time. A simple example of a closed loop control system is a home thermostat. Privacy Policy order of magnitude. <br>With successful completion in 2011 Bachelor of Engineering beginning as Third Engineer on . Theyre also more complex systems than open loop controls, which makes them a more expensive option that has a more involved implementation process. "How Cruise Control Systems Work" Add the following command to the end of your m-file and run it in the MATLAB command window: step(u*cruise) You should get the following plot: From the plot, we see that the vehicle takes more than 100 seconds to reach the steady-state speed of 10 m/s.