Patent ID: 9291075
Filing Date: 2016-03-22
CPC Classification: F01L

Claim Text:
1. A system for diagnosing malfunctions in a variable valve actuation system comprising: a rocker arm assembly comprising: a first arm with a first end; a second arm with a first end pivotally connected to the first arm, the first end of the first arm and the first end of the second arm both pivoting about a same pivot axis; a hydraulically-operated latch assembly functioning to secure the first arm to the second arm when latched for operation in a first operating mode and functioning to allow the first arm to move relative to the second arm when unlatched in a second operating mode; a source of pressurized fluid; a hydraulic valve coupled to the source of pressurized fluid, adapted to provide pressurized fluid to the hydraulically-operated latch assembly; a gallery connecting the hydraulic valve to the hydraulically-operated latch assembly; a pressure transducer for indicating a pressure in the gallery; and a control unit coupled to the hydraulic valve and the pressure transducer, adapted to: accept a hydraulic pressure input from the pressure transducer; and identify motion of a latch of the hydraulically-operated latch assembly based upon the hydraulic pressure input from the pressure transducer.