Berkeley Notes
  • Introduction
  • EE120
    • Introduction to Signals and Systems
    • The Fourier Series
    • The Fourier Transform
    • Generalized transforms
    • Linear Time-Invariant Systems
    • Feedback Control
    • Sampling
    • Appendix
  • EE123
    • The DFT
    • Spectral Analysis
    • Sampling
    • Filtering
  • EECS126
    • Introduction to Probability
    • Random Variables and their Distributions
    • Concentration
    • Information Theory
    • Random Processes
    • Random Graphs
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    • Estimation
  • EECS127
    • Linear Algebra
    • Fundamentals of Optimization
    • Linear Algebraic Optimization
    • Convex Optimization
    • Duality
  • EE128
    • Introduction to Control
    • Modeling Systems
    • System Performance
    • Design Tools
    • Cascade Compensation
    • State-Space Control
    • Digital Control Systems
    • Cayley-Hamilton
  • EECS225A
    • Hilbert Space Theory
    • Linear Estimation
    • Discrete Time Random Processes
    • Filtering
  • EE222
    • Real Analysis
    • Differential Geometry
    • Nonlinear System Dynamics
    • Stability of Nonlinear Systems
    • Nonlinear Feedback Control
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  1. EE128

Introduction to Control

PreviousEE128NextModeling Systems

Last updated 3 years ago

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The general goal of control is to get some physical system to respond to a reference input in the way we would like.

Definition 1

The plant is the physical system which we would like to control.

In general, there are two different types of control.

Definition 2

Open-Loop control is where we pass a reference directly to the actuator to control the plant (see Figure 1).

Open-Loop control is generally difficult because the disturbances make it difficult to copy the reference exactly.

Definition 3

Closed loop control is using the output of our system and comparing it to the reference in order to generate the control signal (see Figure 2).

Notice how the output signal is subtracted from a reference signal, and we use the difference (a.k.a the error) to determine what input we pass into the plant.

Definition 4

The control law K(e)K(e)K(e)is a function of error applied by the controller to determine the inputs to the plant.

Figure 1: Open-Loop Control
Figure 2: Closed-Loop Control