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A conventional PID-controller is used to investigate some process-models. These are going to be used later to test a self-tuner. Some problems associated to digital PID-algorithms are discussed, and such an algorithm is described and implemented in a computer. A simple way to obtain critical gain and period in a closed-loop situation is described, and used to design a self-tuning PID-controller. F
This report treats the adjustment of the parameters of an analogous PID-controller using a search method which optimizes a loss-function. A process model is updated periodically by means of a suitable identification algorithm. The loss-function is minimized by using a search algorithm. This is done by comparing the values of the loss-function for different setting of the parameters forming a verte
Different models of heat load in a district heating system at Karlstad have been tested. The input of the model contains one climatic dependent part and a profile which depends on time. The climatic inputs are outdoor temperature, solar intensity and wind velocity. The profile tries to describe the consumption of hot water. This model has later been used to predict the heat load for one or a few h
This paper considers implementation and test of a self-tuning PI-controller based on pole-placement. The algorithm has been implemented in BASIC on an ABC-80. The sampling of measure values and setting of digital outputs has been done with a remote station TA6500.
The controller has been tested on two processes. First on a test process where the temperature from a hairdryer has been contr
This work is meant to make it probable that, without direct measurement in the fuel line, it is possible to calculate the fuel flow with other parameters.
The investigation is made in one specific case, for a four cylinder carburetor engine. With the model parameters engine speed and intake manifold pressure it is possible to construct a model which showed a good agreement in a comparison wit
Logger is an interactive command driven program for data logging on PDP-ll. It can also generate different signals, perform PID-control and make signal processing. During the logging it is possible to plot or print signals on the terminal. Commands can be entered via the terminal or in a command fi1e. For conversion of the stored signals to text form the program Convrt can be used.
