Temperature Control

System

The experiments are set up with experimental panels in the profile frame. The controlled system or control loop is controlled with the Profi-CASSY and the measured values of interest are recorded.

Learning objectives

• Recognising basic control principles
• Management and fault control
• Handling Analysis and Simulation Software

Function

Controlling the temperature of residential buildings, vehicles or workpieces is a classic example of systems with large time constants. The temperature control system works with two-point controllers as well as with PID and software controllers. It has a 7-segment display for the current temperature. A halogen lamp serves as the heating source, which also makes the heating process visible. The temperature is measured using an NTC resistor. A fan and a lockable flap in the heating channel are available for investigating the interference behaviour. Two integrated power amplifiers (for heating and cooling) enable direct control with the controller; actuators are not required. The temperature control system can also be operated with fuzzy control.

Method

The equipment is equally suitable for demonstrations and student experiments. Experimental procedures are carried out using an electronic manual and the measurement files for CASSY Lab 2 and WinFACT. Plug & Play applies: the experiments start automatically after the measurement file is called up.

Target groups

Vocational training in electrical engineering in trade and industry and students specialising in automation technology and mechatronics. The course offers both introductory courses at a basic level as well as challenging topics for bachelor's programmes.

Additions

The following equipment is recommended for in-depth study:

• E6.3.4.1 Control of electronic routes
• E6.3.4.2 Digital control
• E6.3.4.3 Fuzzy control

Themes

• Characteristic curve of the temperature controlled system
• Recording the step response
• Amount optimum, the substitute controlled system
• Technical controller
• Controller in the limit range
• Empirical dimensioning of controllers
• Controller design with known time constants of the controlled system
• Controller design by pole-zero compensation, KR determination in batch run
• Controller design through numerical optimisation
• Rule of thumb method
• Command and fault control with electronic controller
• Temperature control with software controller
• Temperature control with block-orientated PC simulation
• Temperature control with two-point controller, influence of hysteresis
• Two-point controller with delayed feedback
• Two-point controller with delayed feedback
• Temperature control with three-point controller
• Control loop modelling