To follow the trend of the fuel consumption and emissions reduction, Pierburg Pump Technology has developed several technical solutions. Some of them give very high benefits but in the meantime they have high consequences in terms of additional cost and pump integration into existing engine packaging. In this framework, the goal is to take into account all constraints that already existing engine concepts could face: no hydraulic changes possible, limit additional costs and optimize absorbed power reduction on European homologation cycle. The wet clutch concept is able to take up that challenge thanks to its very innovative technology. Indeed the idea to engage and disengage the pump directly on the impeller allows one to keep existing interfaces with engine and reduce the number of components. However if after a first glance the concept looks simple, the switching elements, as described in this presentation, need to be designed after a very deep simulation analysis involving many different disciplines (hydraulics, electromagnetism, structural mechanics) which are all interacting. Nevertheless that's the only way to really optimize the overall system performance and achieve the maximum saving. The presented results confirm the potential of the concept and show its limitations. Because of the remaining flow rate still delivered during the disengaged mode, the tribological effect on the engine today is limited. However in some cases this limitation can become an advantage when, during the cold start phase, a certain flow rate is necessary in auxiliary cooling circuit for example to warm up the oil or heat the cabin. Nevertheless, thanks to the mechanically absorbed power, the wet clutch concept alone can achieve a 1% fuel consumption reduction in NEDC cycle, while at the same time the additional costs are very low in comparison to other concepts.
Improved fuel consumption thanks to a new switchable water pump concept
2013
19 Seiten, 17 Bilder
Conference paper
English
Improved fuel consumption thanks to a new switchable water pump concept
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