Invention Grant
- Patent Title: Engine including hydraulically actuated valvetrain and method of valve overlap control
- Patent Title (中): 发动机包括液压驱动阀门和阀重叠控制方法
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Application No.: US12685061Application Date: 2010-01-11
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Publication No.: US08171900B2Publication Date: 2012-05-08
- Inventor: Joel Cowgill
- Applicant: Joel Cowgill
- Assignee: GM Global Technology Operations LLC
- Current Assignee: GM Global Technology Operations LLC
- Agency: Harness, Dickey & Pierce, P.L.C.
- Main IPC: F01L9/02
- IPC: F01L9/02

Abstract:
An exhaust valve control method may include displacing an exhaust valve in communication with the combustion chamber of an engine to an open position using a hydraulic exhaust valve actuation system and returning the exhaust valve to a closed position using the hydraulic exhaust valve actuation assembly. During closing, the exhaust valve may be displaced for a first duration from the open position to an intermediate closing position at a first velocity by operating the hydraulic exhaust valve actuation assembly in a first mode. The exhaust valve may be displaced for a second duration greater than the first duration from the intermediate closing position to a fully closed position at a second velocity at least eighty percent less than the first velocity by operating the hydraulic exhaust valve actuation assembly in a second mode.
Public/Granted literature
- US20110168111A1 ENGINE INCLUDING HYDRAULICALLY ACTUATED VALVETRAIN AND METHOD OF VALVE OVERLAP CONTROL Public/Granted day:2011-07-14
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