Thermal shock test stand

A distinction is made here, for example, between the main circuit for the combustion engine and secondary circuits for battery cooling and charge air cooling, for example. These are controlled by means of thermostats and switching valves. Due to the thermostats, which are controlled very quickly, temperature differences of >100 K can occur within very short times (<2 sec.) under extreme conditions.
These thermal differences place a heavy load on the components of the cooling circuits and can lead to failures. The switching valves for regulating the coolant flows in the individual circuits can generate high pressure peaks in individual cases, which in turn can lead to component failure.  

Merkle und Partner has developed 1D models in Matlab Simulink to describe the effects mathematically. There was very good agreement between the test rig built by PTS-Prüftechnik and the simulation.