Abstract: 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.

Abstract: 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.

Abstract: 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 (dmEGR) from the difference between the total exhaust gas mass flow (dmTot) across the engine cylinders, and the turbine mass flow (dmTurb) across the turbine.

Abstract: 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 (7) and a second one estimated from a NOx estimation. Said sensor (7) 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.

Abstract: 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.

Abstract: 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 (dmEGR) from the difference between the total exhaust gas mass flow (dmTot) across the engine cylinders, and the turbine mass flow (dmTurb) across the turbine.

Abstract: The present invention provides for a method and apparatus for controlling an SCR catalytic converter (2). The invention describes a model-based control method including a physical model of the SCR catalyst (2) with more than one NH3 storage cell and a physical model of a NOx sensor (4). The observer feedback gain forces the estimated sensor outputs from the model to converge to measured ones, therefore, there is not ambiguity in the determination of the operating point.

Abstract: 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 (7) and a second one estimated from a NOx estimation. Said sensor (7) 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.

Abstract: 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.