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AssigneeDekati Oy
InventorsJuha Tikkanen, Mikko Moisio, Kauko Janka, Kimmo Pietarinen, Jorma Keskinen, Antti Rostedt
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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.
A method for defining particle emissions from exhaust gases of a combustion engine in an exhaust pipe system or a corresponding exhaust gas duct substantially during the use, in which method emitted particles contained in the exhaust gas are charged and the particle emissions are determined by measuring the electric charge carried by the emitted particles in said exhaust gas duct, wherein 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 said charging, emitted particles brought to at least two different electric charge states are present, wherein the charge of the emitted particles is further defined as a difference value/values measured from the emitted particles brought to said at least two different electric charge states.
A sensor device for determining particle emissions from exhaust gases of a combustion engine in an exhaust pipe system or a corresponding exhaust gas duct substantially during the use, which device comprises at least one charger arranged in said exhaust gas duct for charging emitted particles contained in the exhaust gas, and at least one charge measuring means arranged in said exhaust gas duct for measuring the electric charge carried by the emitted particles, wherein said at least one charger is arranged to charge the emitted particles by varying the way of charging or the charging power with respect to time in such a manner that emitted particles brought to at least two different electric charge states are present, wherein said at least one charge measuring means is arranged to determine the charge of the emitted particles as a difference value/values measured from the emitted particles brought to said at least two different electric charge states.
Dependencies are inferred from the claim text.