Patent ID: 9016252
Filing Date: 2015-04-28
Classification: F01L

Abstract:
1. A system for diagnosing malfunctions in a variable valve actuation system comprising: a hydraulic lash adjuster (HLA) having a chamber filled with a fluid; a rocker arm assembly having a first end adapted to pivot upon the HLA, the rocker arm assembly capable of being in one of a first mode and a second mode, the rocker arm assembly comprising: a latch assembly functioning to secure the first arm to the second arm when latched in a first mode and functioning to allow the first arm to move relative to the second arm when unlatched in a second mode; a pressure transducer coupled to the HLA chamber adapted to generate a pressure signature signal indicative of fluid pressure in the HLA chamber; and a control unit coupled to the hydraulic valve and the pressure transducer, adapted to: