Valve control system with a variable timing hydraulic link

Details Valve control system with a variable timing hydraulic link Valve control system with a variable timing hydraulic link

1989-08-30

1991-03-26

Myhre, Charles J.

Internal-combustion engines

Poppet valve operating mechanism

Hydraulic system

123 9016, F01L 902, F01L 134

Patent

active

050020226

ABSTRACT:
A valve tappet and control system is provided including expansible and collapsible hydraulic link; wherein the control system causes expansion of the hydraulic link and determines the timing of the collapse and thus the closing of an intake valve of an internal combustion engine. The timing is variable depending on engine operating conditions, such as output power and turbo charger boost pressure. In one embodiment, a rotary valve and fluid gating device is used to connect a pressure line used to expand the hydraulic link to a dump line at one instance during each cam shaft rotation to provide the early closing of the valve. In a second embodiment, a rotary cam follower with an oblique surface is used, wherein the orientations of the oblique surface is the determinative feature that is controlled to change early closing time as well as a delayed opening. A third embodiment utilizes a separate drain line from the hydraulic link that is opened by an electromagnetic solenoid controlled by a distributor system with a time variable adjustment.

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