System to diagnose variable valve actuation malfunctions by monitoring fluid pressure in a control gallery
US9291075B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 30, 2013 |
| Grant date | Mar 22, 2016 |
| Priority date | — |
| Expiry date | Apr 30, 2033 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01L2820/043
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A system for diagnosing malfunctions in a variable valve actuation device is disclosed. The system has a rocker arm assembly that includes: a first arm, a second arm with the first and second arms attached at a first end, a hydraulically operated latch assembly that functions to secure the first arm to the second arm when latched. It also includes a source of pressurized fluid connected to a hydraulic valve that provided fluid high or low pressure fluid to the hydraulically-operated latch. The latch may be operated by a remote device. A control gallery connects the hydraulic valve to the latch. A pressure transducer is positioned within the gallery and is adapted to create a signal indicating the pressure in the gallery. A control unit is coupled to the hydraulic valve and the pressure transducer, and is adapted to sense engine operation parameters, actuate the hydraulic valve, read the signal from the pressure transducer; and identify malfunctions of the rocker arm assembly based upon the signal from the transducer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.