Method and system to avoid piston-valve collision

Details Method and system to avoid piston-valve collision Method and system to avoid piston-valve collision

2007-02-20

2007-02-20

Denion, Thomas (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

C123S090160, C123S090100, C701S101000, C701S102000, C701S105000

Reexamination Certificate

active

11177832

ABSTRACT:
A method and system to avoid collision of piston and engine valves is provided. This facilitates use of a fully flexible variable valve actuation system over its operating range, without arbitrary constraints. Included is actuation control of the engine valve, determination of a crank angle at which to initiate engine valve opening, and determination of a desired valve lift, and, duration of valve open time. Opening profile for the engine valve is estimated. A first and a second crank angle are calculated, based upon the estimated opening profile. The crank angle to initiate engine valve opening is determined by adding a safety margin to the second crank angle. The method determines a maximum valve lift, given the duration of valve open time and an engine valve opening crank angle, and a minimum duration of valve open time, given a valve lift and an engine valve opening crank angle.

REFERENCES:
patent: 6230675 (2001-05-01), Kobayashi et al.
patent: 6575128 (2003-06-01), Nakamura et al.
patent: 6938593 (2005-09-01), Magner et al.
patent: 6994061 (2006-02-01), Magner et al.
patent: 2004/0261736 (2004-12-01), Babbitt et al.
patent: 2006/0027196 (2006-02-01), Shimojo et al.

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