DESIGN AND CONSTRUCTION OF A SPEED CONTROL OF A DC FAN USING A FUZZY CONTROLLER


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DESIGN AND CONSTRUCTION OF A SPEED CONTROL OF A DC FAN USING A FUZZY CONTROLLER

PROJECT TOPICS AND MATERIALS ON DESIGN AND CONSTRUCTION OF A SPEED CONTROL OF A DC FAN USING A FUZZY CONTROLLER


CHAPTER 1

INTRODUCTION

1.1 BACKGROUND STUDY

Temperature Control cuts through a variety of Industrial and domestic processes such as temperature controlled heat exchangers, baths, green houses, incubators. A DC motor may be used as Fan in accomplishing temperature control. An Electric Fan is basically a device which comprises of three blades at 120 degrees mounted on the DC motor spindle.An electric fan circulates the air around its environment while an air-conditioning system changes the temperature of the air in it environment. Many system used in our daily life which require controlling are non-linear in nature; hence, a detailed system dynamics is difficult to represent mathematically. Temperature control is stochastic and a slowly changing process which requires heuristic based control. Many authors have proposed Fuzzy Logic Inference System in dealing with temperature control.  In households during summer which is analogous to dry season in West Africa, Air conditioners are responsible for 60-70% of summer electricity bill. A window air-conditioning unit uses 500 to 1440 watts,while a 2.5-ton central system uses 3500 watts .However, an electric fan uses only 90 watts, depending upon the speed and size (Ali Newaz Bahar et al, 2012). An electric fan is a device that on the long run will on the one hand help in keeping us cool in summer and on the other hand help in saving money as well as protecting the environment by limiting the release of Carbon-monoxide (Lakshya Kumar et al, 2015).

In this project, a Fuzzy logic controller design is proposed for deployment of the process variable due to the fact that temperature is a slowly changing variable. Hence, for precision control of a stochastic process variable Fuzzy logic based control suffices. While all the regularly used systems are defined by mathematical equations. The temperature of the metal plate decides the amount of current that can pass through it. Temperature of the metal plate is measured with the help of temperature sensors (Lakshya Kumar et al, 2015). The amount of energy supplied to the fan is to be controlled by SVM or PWM technique.

The human brain has an unpredictable way of reasoning and thus has a high adaptive approach with recourse to control. It does not reason as computers do. Computers reason in a clear statement that uses true or false (0 or 1) - an element is either a number of a given set or it is not. There are many complex systems which do not fit into the precise categories of conventional set theory. This is because of the fact that there is no way to define a precise  threshold  to  represent  their  complex  boundary,  and  as  such  their  control  system  is  complex.  Fuzzy logic was developed owing to this imprecise nature of solving control problems by computer. In a  fuzzy  logic-based  system,  a  variable  can take  any  truth  value from  a  close  set  [0,  1]  of  real  numbers  thus  generalizing  Boolean truth  values [1]. But  the  fuzzy  facts are  true only  to some  degrees  between  0  and  1,  and  they  are  false  to  some  degrees  (Isizoh A. N., et al, 2012). The Fuzzy inference is based on Human heuristic reasoning pattern. But computers  cannot  do  so  because  its  logic  is  based  on  approximate  reasoning  in  a  more  familiar  Boolean  forms  of  logic used in conventional set theory.  Fuzzy logic allows the  use of labels like “slightly”, “moderately”, medium, and “very” so  that  statements  may  be  made  with  varying  degree  of precision. This flexibility is useful in coping with the imprecision of real-world situations such as designing precision environmental control systems. In a broad sense, fuzzy logic refers to fuzzy sets - a set with non-sharp boundaries. Fuzzy logic is widely used in machine controls, as it allows for  a  generalization  of  conventional  logic  and  provides  for terms  between  “true”  and  “false”,  like  “almost  true”  or partially  false”. This makes the logic not to be directly processed on computers but must be emulated by special codes. A fuzzy logic based design control system offers flexibility in  system  design and implementation,  since its implementation uses  “if  then”  logic  instead  of  sophisticated  differential equations.  It’s technology that provides room for graphical user interface, which makes it understandable by people who do not have process control backgrounds. Another key significance of a fuzzy logic-based control design is the ability to automatically and smoothly adjust the priorities of a number of controlled variables. Finally, it  helps  to  achieve  a process that  is  stable  for  a  long  period  of  time  without  a  need  for intervention. However, because  of  the  rule-based  operation  of  fuzzy  systems, any reasonable number of inputs can be processed and  numerous  outputs  generated;  although defining  the  rule-base quickly  becomes  complex  if  too  many  inputs  and  outputs  are chosen for a single implementation,  since rules defining their inter-relations must also be defined. There are countless applications of fuzzy logic. In fact many  researchers  still  claim  that  fuzzy  logic  is  an  encompassing theory over all types of logic .Fuzzy  logic  can  control  non-linear  systems  that  would  be  difficult  or  impossible  to  model  mathematically. This opens door for control system that would normally be deemed unfeasible for automation. There are many  approaches  to  implement  fuzzy  logic systems;  they  can  be  software  only,  hardware  only  or  the combination of software and hardware. In recent years, fuzzy logic has been implemented using several technologies to solve real world problems such as image processing, robotics/motion control, pattern recognition, fuzzy database and industrial engineering applications. Fuzzy  logic  is  also  spreading  applications  in the field of telecommunications, particularly in broad  band  integrated  networks,  based  on  ATM  Technology.

1.2 STATEMENT OF PROBLEM

The control modes used varies like ON/OFF control, the linear predictive control (LPC) and PID control system.

 The ON/OFF system regulator is not accurate enough. This control mode is the simplest form of control Low accuracy and quality leads the system to become unstable due to mismatch error generated by inaccurate time delay parameter used in the model. Transient and overshoot are present when the controller is used to control the cooling system because it exceeded the required control for certain period.

 

Figure 1: Block diagram of a ON/OFF system for temperature control system

 

 

The linear predictive control, is capable of controlling the indoor temperature within the required limits most of the time but not all the time, the linear predictive control in the relative short prediction periods are used which do not cause any problem, but it is obvious that with larger prediction periods more computing time is necessary and the linear programming problems require more memory.

 

 

Figure 2: optimal predictive control system for temperature control

The proportional integral derivative (PID) controller structure is mostly widely used thanks to its structural simplicity and applicability in solving practical control problems but is not however almighty in many cases, it provide disturbance ,this disturbance is unknown ,making it difficult to attenuate.

 

Figure 3: Block diagram of a PID controller

Traditional proportional integral derivative (PID) controller sometimes doesn’t satisfy the control purpose for the object which has larger inertia delays and non- linear characteristics and uncertain disturbances factor like the tall and big space, because of the dissatisfaction of the tuning parameter, the effect of dissatisfying performance and the adaptability to different medium.

 But the used PD controller is better than PID control because the strictly limit and the overshoot and easy deals gives us good result than PID control.

So in this project we choose to use fuzzy logic control (FLC) because the fuzzy logic control provides a good performance without transient and overshoot and the use of appropriate automatic control strategies such as fuzzy control system is based on the operational experience of human expert, the system is robust to changes in environment.

 

 

Figure 4: Block diagram of fuzzy logic controller

 

 

The main advantage of fuzzy logic controller as compared to conventional control approaches resides in the fact that no mathematical modeling is required for the design of the controller. Fuzzy controllers are designed on the basis of the human knowledge of the system behavior.in addition the controllers that directly regulate humans thermal comfort have advantages over the thermostatic controller. The main advantages are increased comfort and energy saving.

1.3 AIM AND OBJECTIVES OF WORK

The aim of the project is to control the speed of a DC fan using a fuzzy controller based on variation in temperature, to achieve good response during changes in load demand, self- tuning fuzzy controller is designed to reduce overshoot, undershoot during command speed variations and transient.

The objectives of this project are:

  • To develop a cooling ventilation system integrated with speed controller based on temperature sensor.
  • To improve the cooling system in room using fan rather than using air conditioner associated with sustainability and environmental friendly using fuzzy control logic
  • To design a controller using MAT-LAB Fuzzy Logic tool box
  • To evaluate the performance of the controller for both the experimental and Simulated model

1.4 SIGNIFICANT OF WORK

The needs for the design of an automatic room temperature control fan are as follows:

  • It helps in controlling fluctuating room temperature by adjusting Fan to achieve the desired set point.
  • It eliminates the need for human intervention as opposed to constant watching on the device by set controlling the temperature of the system
  • It overcomes the disadvantages of thermostatic analogue system in terms of accuracy.
  • It is used where it is important to maintain precise temperature.
  • It overcome the limitation of conventional control that how to be operated by physically going near them and switch on the button.
  • The designed controller may be deployed for other slowly changing controlled process variable.

1.5 SCOPE OF WORK

The project scopes relates to

  • Development of model house included the dimension and high ceiling using solid work
  • Design and Construction of the Prototype
  • Simulation of the process using MAT LAB AND PROTEUS
  • Microcontroller programing of Fuzzy logic Inference
  • Construction and Soldering of the Temperature Control Circuitry (e.g Power Supply based SVM or PWM ).

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Temperature Control cuts through a variety of Industrial and domestic processes such as temperature controlled heat exchangers, baths, green houses, incubators. A DC motor may be used as Fan in accomplishing temperature control. An Electric Fan is basically a device which comprises of three blades at 120 degrees mounted on the DC motor spindle.An electric fan circulates the air around its environment while an air-conditioning system changes the temperature of the air in it environment. Many system used in our daily life which require controlling are non-linear in nature; hence, a detailed system dynamics is difficult to represent mathematically. Temperature control is stochastic and a slowly changing process which requires heuristic based control. Many authors have proposed Fuzzy Logic Inference System in dealing with temperature control. In households during summer which is analogous to dry season in West Africa, Air conditioners are responsible for 60-70% of summer electricity bill. A window air-conditioning unit uses 500 to 1440 watts,while a 2.5-ton central system uses 3500 watts .However, an electric fan uses only 90 watts, depending upon the speed and size (Ali Newaz Bahar et al, 2012). An electric fan is a device that on the long run will on the one hand help in keeping us cool in summer and on the other hand help in saving money as well as protecting the environment by limiting the release of Carbon-monoxide (Lakshya Kumar et al, 2015)... electrical and electronics engineering project topics

DESIGN AND CONSTRUCTION OF A SPEED CONTROL OF A DC FAN USING A FUZZY CONTROLLER

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