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Open and Closed Loop Control System

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Introduction

Ricki Lambert Control Technology Assignment 1 Task 3 In this assignment I shall be looking at the differences between open loop control systems, closes loop control systems and also looking at and identifying the input, output and feedback gained. Open Loop Control System The open loop control system is the cheapest form of control system you can have, this is due to its simplicity. The open loop control system has absolutely no artificial intelligence or any form of sensor what so ever. This then means there is nothing controlling the inputs going in to the system, this then means that accuracy may be deficient and the system will not be working to its true efficiency. An example of this kind of system would be that for a microwave. When we turn a microwave on we select the power we want and the time limit we want and away it goes. The thing is, when it is powering itself up, how does it no if it's hitting the true temperature we wanted successfully? ...read more.

Middle

Action - This is the action of the computer or comparator altering settings There are two differing types of systems that can be used for control and they are Analogue or digital. The two shall be explained in greater detail below. Digital and Analogue Control Systems The digital control system is used in the form of a micro controller to control a computer system. A digital controller is usually cascaded with the plant in a feedback system. The rest of the system can either be digital or analog. Some examples of analog systems with a digital feedback controller are: * Aircraft * HVAC * Electric motors * PID controllers * Radar * Robotics * Typically, a digital controller requires: For mixed control types such as digital and analogue systems we need a process of conversion, for example digital to analogue converters (these are called DACS). The opposite can take place, by using an analogue to digital conversion process called ADC. All of these analogue control systems are embedded with micro controllers. ...read more.

Conclusion

Below is a list of the possible input devises we can have within a system or a circuit. * Geophone - Converts earth tremors in to electrical voltage * Geiger-Muller tube used for measuring radioactivity * Cathode ray tube (CRT) - converts electrical signals into visual form When the electrical charge is received it then needs to be converted in to the correct signal type using one of the transducers above, however for these signals to be used correctly we need to obtain the appropriate components. * Lamp - The input for a lamp is electricity and this is then output as a light source after being converted. This type of power source is used for many things * Speaker - Gathers electricity from the data source and then is output as a volume so people can hear it. This also has a large application/usage basis * Heat - The input again is electricity, this is then converted and output as heat. This is normally found on things like electric fires and car cigarette lighters * Motor - This is input of electricity and then is output as movement energy. This type of system is used within moving doors ...read more.

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