Control Of An Oven With Space­Distributed Sensors

Resumo

PID controllers are robust and easily synthesized. The are many techniques that allow its tuning with
simple steps, with or without a system model. The direct synthesis method allows us to find gain expressions
in terms of the model parameters, using its canonical representation. We used a thermal system, available at the
Signals and Systems Laboratory of CEFET­MG’s campus V, which is composed of 9 sensors placed in series along
an acrylic path with forced ventilation. Three resistances and a damper act as actuators for the system, heating the
air and regulating its flow. We identified 1280 first­order models for this system, using different combinations of
damper opening, resistance power and selected output sensor by using the complementary output method and used
a subsample of those to create controllers using direct synthesis. We use a set of equations developed by ourselves
and another set found in an article. We tested them in the real system with satisfactory results.