Patent ID: 6736093
Filing Date: 2004-05-18
Classification: F01L

Abstract:
Device for controlling at least one gas-changing valve (10) of an internal combustion engine, with at least one valve adjuster (20) coupled with a gas-changing valve (10) for its operation, which has an adjusting piston (16) axially-displaceably accommodated in a housing (15), the adjusting piston (16) closing the associated gas-changing valve (10) in an upper end position and maximally opening the associated gas-changing valve (10) in a lower end position, and two pressure chambers (17, 18) axially defined by the adjusting piston (16) and having different sized active surfaces, of which pressure chambers, a lower pressure chamber (18) defined by a smaller active surface is permanently acted upon by fluid pressure and an upper chamber (17) defined by a larger active surface can be pressurized and depressurized by means of a supply and return (21, 22) interchangeably with the fluid pressure, characterized in that the return (22) of the upper pressure chamber (17) is divided into at least two run-off openings (221, 222) arranged axially spaced in the housing (15), of which a lower run-off opening (222) lies in a displacement path of the adjusting piston (16), such that the lower run-off opening can be displaced by the adjusting piston before reaching the end position, and an upper run-off opening (221) is connected with the lower run-off opening (222) via a throttle opening (23), whose opening cross section is adjustable by means of a control pressure, and that for adjustment of the control pressure, a temperature-controlled pressure-regulating valve (40) that puts out fluid is provided.