The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 27, 2003
Filed:
Aug. 23, 2002
Franz Pischinger, Aachen, DE;
Wolfgang Salber, Aachen, DE;
Thomas Esch, Aachen, DE;
Frank van der Staay, Würselen, DE;
Oliver Lang, Aachen, DE;
FEV Motorentechnik GmbH, Aachen, DE;
Abstract
A piston internal combustion engine with at least one gas exhaust valve ( ) for each cylinder ( ), which is actuated by an actuator ( ), in particular an electromagnetic actuator, controlled by a fully variable engine control unit ( ). Based on the predetermined operating cycle, the valve can close off the cylinder interior space against a gas exhaust channel ( ) that follows the valve seat ( ) of the exhaust valve. This channel is connected to an exhaust gas system and is provided with a means for example a constriction ( ) for reducing the pressure gradient during the start of the opening of the gas exhaust valve ( ). A specific pressure fluctuation is used for a further reduction in the pressure gradient behind the exhaust valves during the opening through a corresponding layout of the pipe geometry and the container volumes in the exhaust gas system or corresponding installed components.