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:
Aug. 05, 2008
Filed:
Jun. 22, 2004
Juha Tikkanen, Tampere, FI;
Mikko Moisio, Tampere, FI;
Kauko Janka, Tampere, FI;
Kimmo Pietarinen, Tampere, FI;
Jorma Keskinen, Tampere, FI;
Antti Rostedt, Tampere, FI;
Juha Tikkanen, Tampere, FI;
Mikko Moisio, Tampere, FI;
Kauko Janka, Tampere, FI;
Kimmo Pietarinen, Tampere, FI;
Jorma Keskinen, Tampere, FI;
Antti Rostedt, Tampere, FI;
Dekati Oy, Tampere, FI;
Abstract
A method and a sensor device for determining particle emissions from exhaust gases of a combustion engine substantially during the use in an exhaust pipe system or a corresponding exhaust gas duct, in which method emitted particles contained in the exhaust gases are charged and the particle emissions are determined by measuring the electric charge carried by the emitted particles in the exhaust gas duct. The emitted particles are charged by varying the way of charging or the charging power with respect to time in such a manner that as a result of the charging, emitted particles brought into at least two different electrical charge states are present, wherein the charge of the emitted particles is further determined as a difference value/values measured from the emitted particles brought into said at least two different electrical charge states.