Device for controlling at least one gas-changing of an internal combustion engine

US6736093B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Uwe Hammer · Hemmingen, DE
• Bjoern Alexander Schuetz · Besigheim, DE

Key dates

• Filing date: May 29, 2003
• Grant date: May 18, 2004
• Expiry date: May 29, 2023

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F01L2001/34446
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A device for controlling at least one gas-changing valve (10) of an internal combustion engine includes a valve adjuster (20) with an adjusting piston (16) limiting two pressure chamber (17, 18). The lower pressure chamber (18) is permanently acted upon by fluid pressure and the upper pressure chamber (17) can be interchangeably pressurized or depressurized with the fluid pressure. The braking of the adjusting piston (16) before reaching its upper end position affecting the closing position of the gas-changing valve, the return (22) of the upper pressure chamber (17) is divided into at least two axially spaced run-off openings (221, 222), of which the lower run-off opening (222) can be closed by the adjusting piston (16) and the upper run-off opening (221) is connected with the lower run-off opening (222) via a throttle opening (23) controllable in an opening cross section. For a temperature-independent braking action of the throttle opening (23), a temperature-controlled, pressure-regulating valve (40) is provided for adjusting the control pressure on the throttle opening (23).