CAE Simulation of Engine Oil Pump Whine: Design Modifications and Countermeasures

Paper #:
  • 2017-01-1076

Published:
  • 2017-03-28
Abstract:
Engine and transmission oil pumps are one of the primary sources of tonal noise or whine inside the vehicles. The whine is specially a cause for NVH concern during vehicle coast down when the engine background noise acting as sound masking for the whine is decreasing. To prevent and/or reduce the risk of oil pump-induced tonal noise, upfront NVH evaluation of the oil pump is required. Through analytical CAE approach oil pump pressure pulsations corresponding to different orders of the pump can be evaluated. And modifications to the oil pump design can be studied in order to reduce the pressure peaks and/or breaking down the peaks over their frequency spectrums to introduce self-masking effect. In this presentation, a couple of CAE case studies addressing oil pump-induced whine in an I4 during coast down along with test data are reviewed. The studied pump is of a variable displacement vane type. Additionally, the effect of oil pump pick-up tube positioning inside the oil pan and its effect on whine during engine idle in an I5 engine is investigated. The investigations include several design modifications to the pump and pick-up tube to prevent whine. Design modifications include optimization of oil pump vane spacing in order to reduce pressure pulsations and break the pump orders over broader frequency ranges for tonal noise reduction.
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