Patent ID: 6425356
Filing Date: 2002-07-30
Classification: F04B,F16K

Abstract:
A piston-type internal-combustion engine having cylinder valves, which can be actuated completely variably by way of a valve timing (2) and are connected to an air-supply conduit (4), which is provided with a device (6) for generating a vacuum by utilizing energy components of the air flowing through the air-supply conduit (4), the device being provided with controllable elements for adapting to changes in the flow energy as dictated by operating conditions, the device further being connected to at least one vacuum consumer (8, 9, 10) by way of at least one vacuum line (7); said air-supply conduit having at least two parallel conduits (4.1, 4.2), which respectively have a cross-sectional bottleneck (14.1, 14.2) that is connected, at least on the exhaust side, to the air-supply conduit (4), with the cross-sectional bottlenecks (14.1, 14.2) being of different sizes, and with a controllable actuating element (20) being provided for selective guidance of the air flow through the parallel conduits (4.1, 4.2).