Ratio, override, split-range и итоговая стратегия
Цель: Изучить тему «Ratio, override, split-range и итоговая стратегия» и закрепить её практическими заданиями и самопроверкой.
2 акад. часа чтение и разбор теории, решение задач, работа со схемой или виртуальным стендом и проверка понимания.
Основной материал
Ratio control maintains relationship between two flows, e.g. air/fuel. One flow may be wild stream, second setpoint computed from ratio. Override/select control chooses most restrictive controller to protect constraint. Split-range divides one output between two actuators.
Strategy selection
Control architecture should reflect process physics. PID tuning cannot fix wrong measurement location or wrong manipulated variable. Good engineer first asks: what disturbance, where measured, what actuator, what delay, what constraints.
Практическая работа
Design concept for combustion: fuel flow and air flow ratio, pressure override, temperature feedback trim. Identify loops and safety boundary (without designing certified burner management system).
Что нужно запомнить
- Ratio control maintains relationship between two flows, e.g.
- One flow may be wild stream, second setpoint computed from ratio.
- Override/select control chooses most restrictive controller to protect constraint.
- PID tuning cannot fix wrong measurement location or wrong manipulated variable.
- Good engineer first asks: what disturbance, where measured, what actuator, what delay, what constraints.