Method of variable valve timing in an internal combustion...

Details Method of variable valve timing in an internal combustion... Method of variable valve timing in an internal combustion...

2011-01-25

2011-01-25

Chang, Ching (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

C123S090120, C123S090170, C123S090520

Reexamination Certificate

active

07874272

ABSTRACT:
A method of variable valve timing in an internal combustion engine in which the valve opening and closing timing of the actuated gas exchange valves of the internal combustion engine can be varied as a function of engine speed by adjusting means for adjusting at least one camshaft relative to a crankshaft, said internal combustion engine comprising hydraulic valve lash adjusters for adjusting a valve lash of the gas exchange valves, said lash adjusters being configured at least on one of an inlet side and an outlet side as idle stroke elements which, when actuated, at first produce an engine speed-dependent idle stroke and to provide a method of variable valve timing for internal combustion engines comprising a camshaft adjustment and a hydraulic valve adjustment with an idle stroke function that guarantees favorable valve timing in all operational situations of the internal combustion engine and, at the same time, improves the thermodynamic exploitation of such internal combustion engines, at each adjustment of the at least one camshaft, the respective idle stroke of the valve lash adjusters is taken into account.

REFERENCES:
patent: 4054109 (1977-10-01), Herrin
patent: 4491098 (1985-01-01), Rotondo
patent: 5758613 (1998-06-01), Edelmayer
patent: 7296549 (2007-11-01), Sailer et al.
patent: 0 945 598 (1999-09-01), None
patent: 61 185607 (1986-08-01), None

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