Abstract
AbstractPowertrain electrification brings new challenges to strange noises due to new engine operational applications [1,2,3].Unacceptable noises may have negative influence on the marketability [4]. Therefore, sound quality development instead of sound pressure level are the basic features of OEM products to improve [5,6,7].On one hybrid 3-cylinder engine, crankshaft main bearing strong ticking was detected on engine test bench as well as that on vehicle during idle charging. This error state occurs under P gear tip in and idle charging which led to big complaints from customers. By simulation and bench testing the root cause was identified as the third main bearing oil cavitation collapse. Upon this finding a new lubrication concept of the crankshaft bearing and connecting rod bearing were developed.This paper explores the causes and countermeasures.KeywordsHybridTickingLubricationIdle charging
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