Measuring and testing – Gas analysis – Gas of combustion
Reexamination Certificate
2004-06-22
2008-08-05
Williams, Hezron (Department: 2856)
Measuring and testing
Gas analysis
Gas of combustion
Reexamination Certificate
active
07406855
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.
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Janka Kauko
Keskinen Jorma
Moisio Mikko
Pietarinen Kimmo
Rostedt Antti
Dekati Oy
Frank Rodney
Franklin Eric J.
Venable LLP
Williams Hezron
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