  The power conserving interconnection of port-thermodynamic systems via their
power ports results in another port-thermodynamic system, while the same holds
for the rate of entropy increasing interconnection via their entropy flow
ports. Control by interconnection of port-thermodynamic systems seeks to
control a plant port-thermodynamic system by the interconnection with a
controller port-thermodynamic system. The stability of the interconnected
port-thermodynamic system is investigated by Lyapunov functions based on
generating functions for the submanifold characterizing the state properties as
well as additional conserved quantities. Crucial tool is the use of canonical
point transformations on the symplectized thermodynamic phase space.
