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lecture1_small - Discrete-time systems Objective Designing...

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Digital control systems Control is a hidden technology: When it works well nobody notices! Espresso machine: 1 or 2 loops (temperature, pressure). Automobile: 5 to 20 control loops (engine, climate, brakes, radio) Mars rovers: 10 to 20 control loops (navigation, speed control) Aircraft: 50 or more loops (flight control, servos, redundancy) Process control: 100 to 1000 control loops (levels, temperature, pressures) And when it doesn’t the results can be catastrophic. Saab aircraft crash: pilot/control system interaction Chernobyl nuclear reactor: operation at an unstable condition Roy Smith: ECE 147b 1 : 2 Discrete-time systems Objective: Designing digital control systems. These typically arise in one of two ways: The system we wish to control is digital. For example: - NYSE end of day prices; - Internet traffic; - Number of students in ECE 147b. The system is continuous and we are sampling it via an A/D board and actuating it via a D/A board. For example: - Electromechanical systems (robots, motors, vehicles); - Complex chemical production processes.
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