Method for exhaust gas-recirculation
AssigneeDeutz Aktiengesellschaft
InventorAndreas Friesen
Life of this patent
Estimating the term…
Abstract
A method for exhaust gas recirculation (EGR), in particular in internal combustion engines, in particular for reducing NOx emission, by actuating an EGR valve (2) and/or a throttle flap (3), characterized in that during a predetermined period of time after determining an NOx value of the values for actuating the EGR valve (2) and/or the throttle flap (3) a mathematical model is employed, in which the currently determined NOx values, the period of time elapsed since completing the NOx measurement and the parameters relevant for the NOx reduction of the internal combustion engine (1) are included.
Claims11
A method for exhaust-gas recirculation (EGR) of exhaust gas from an internal combustion engine, comprising:
- controlling an EGR valve and/or a throttle valve, during a predetermined period of time following determination of an NOx value of values for controlling the EGR valve and/or the throttle valve, using a mathematical model,
- wherein currently ascertained NOx values, a period of time that has elapsed since a completion of a NOx measurement, and parameters of the internal combustion engine relevant for NOx reduction are entered into the mathematical model, the mathematical model providing an output value for controlling the EGR valve and/or the throttle valve by adapting a plurality of output elements,
- wherein the adapting the plurality of output elements includes providing a weighting factor for each output element.
An internal combustion engine comprising:
- at least one exhaust tract;
- at least one induction tract;
- at least one of an EGR valve and a throttle valve;
- at least one exhaust system;
- at least one NOx sensor;
- and
- at least one controller controlling the at least one of the EGR valve and the throttle valve, during a predetermined period of time following determination of an NOx value of values for controlling the EGR valve and/or the throttle valve, using a mathematical model,
- wherein currently ascertained NOx values, a period of time that has elapsed since a completion of a NOx measurement, and parameters of the internal combustion engine relevant for NOx reduction are entered into the mathematical model, the mathematical model providing output values for controlling the EGR valve and/or the throttle valve by adapting a plurality of output elements,
- wherein the adapting the plurality of output elements includes providing a weighting factor for each output element.
Dependencies are inferred from the claim text.