Fpt Motorenforschung Ag

Iveco Motorenforschung Ag

Theophil Auckenthaler

Werner Zaehner

Werner Zähner

The present invention provides for a method and device for monitoring an ambient humidity sensor in a combustion engine, where the monitoring of the ambient humidity sensor is made by comparing the ambient humidity measured by said humidity sensor and an ambient humidity determined from an oxygen measurement of at least another sensor in the engine system, such as a NOX, or Lambda and/or an oxygen sensor. Said comparison is made using an offset of the oxygen signal reading of said at least another sensor, in a fuel cut condition where the drift or offset of said another sensor is related to the variation of the ambient humidity.

Method and device for monitoring a humidity sensor in a combustion engine, using oxygen measurement of other sensors in the engine, such as NOx, lambda and/or oxygen sensors

It is described a method for controlling an oxygen pump cell of a sensor in an internal combustion engine or in the exhaust gas after treatment system of such an engine, comprising the step of adding, to a feedback control of the current in the pump cell, a further feed-forward control path estimating an expected oxygen pump current on the basis of characteristics of the exhaust gas composition calculated from engine operation data.

Control method and device for oxygen pump cells of sensors in internal combustion engines or exhaust gas after treatment systems of such engines

The present invention provides for a method and apparatus for measuring and controlling the EGR rate in a combustion engine system, comprising an EGR cooler, an EGR valve and a turbine, and determining the EGR mass flow (dm) from the difference between the total exhaust gas mass flow (dm) across the engine cylinders, and the turbine mass flow (dm) across the turbine.

Method and apparatus for measuring and controlling the EGR rate in a combustion engine

The present invention provides for a system for controlling NOx emissions based on the calculation of an error given by the difference between a first measured value obtained from a NOx sensor () and a second one estimated from a NOx estimation. Said sensor () can be used in an adaptation loop, where an open-loop or closed-loop EGR control system is adapted such that the expected NOx emissions (from the EGR controller) match the ones measured with the NOx sensor under steady-state conditions.

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St. Gallen, Switzerland

Theophil Auckenthaler