Systems for diagnosing valve lift mechanisms and oil control valves of camshaft lifting systems

摘要

A system for an engine (12), comprising: a signal monitoring module (220) that receives a cylinder fuel correction signal when an engine speed signal is in a first predetermined range of speed for a predetermined duration and an engine load signal for the predetermined duration in a second predetermined one Range of a load; and a fault detection module (228) that detects a reversible roller cam follower (SRFF) (16) and / or an oil control valve (OCV) fault (18) based on the cylinder fuel correction signal and an exhaust gas recirculation (EGR) value Cylinder fuel correction signal based on an engine position signal and an oxygen signal and / or a wide-range air fuel signal (WRAF signal) is generated.