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:
Oct. 05, 2004
Filed:
Feb. 04, 2003
Christian Birkner, Irlbach, DE;
Arno Friedrich, Regensburg, DE;
Michael Käsbauer, Neutraubling, DE;
Siemens Aktiengesellschaft, Munich, DE;
Abstract
For the checking of an exhaust gas recycling valve, the control signal for the exhaust gas return valve is returned from a defined value to zero, in the idle state of the internal combustion engine while the vehicle is at a standstill and the reaction of the signal (MAF) from an airflow detector in the inlet tract is evaluated. Should the signal not exceed a given threshold value (MAE SWD), within a first time period (T2), then a faulty dynamic is assigned to the exhaust recycling valve. Should the signal not exceed a second given threshold value (MAF SWS), within a second time period (T3), then it is determined that the exhaust recycling valve can not be completely shut.