SOBEK GROUP – Systemlieferant elektrischer, hydraulischer und pneumatischer Komplettlösungen

Case Study

Electrically controlled mixing valve with innovative control mechanisms


Downsizing of combustion engines brings high demands on the thermal management. The coolant circuit of a newly designed vehicle concept required a mixing valve with specific product properties. We developed an electrically controlled mixing valve with innovative control mechanisms.



Task – controlling the temperature of the hybrid circuit

The thermal management of a modern downsizing engine with an extremely high liter flow rate requires a previously unknown level of flexibility in controlling the volume streams of the coolant circuit. Existing products could not map the desired control mechanisms. Various cooling circuits need to be specifically and quickly adjusted to the desired temperature via a central mixing valve.

Challenge – several complex control mechanisms in one valve

There were high requirements for the control mechanisms with the goal to map these in one single product. The control needed to happen via a BUS-protocol which was integrated into the vehicle electronics. In addition, high switching speeds needed to be achieved during simultaneous high switching cycles and high flow rates (> 60 l/min).

Approach – not possible is not an option – a multi-functional valve with singular availability

  • Design of a control mechanism which maps the required setting parameters
  • Design validation on the test bench in a water bath
  • Assembly and design validation with motor and control electronics on the test bench
  • Construction and assembly of prototypes for prototype tests on the road

Result – temperatures for the hybrid circuit are in the required range

The mixing valve designed by SOBEK combines complex control mechanisms during simultaneous high switching speeds, high switching cycles and high flow rates.





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