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A method for checking the functionality of a water adsorber in the exhaust of an internal combustion engine is provided. A sensor measures the temperature of the exhaust gases downstream in the flow direction from the water adsorber, and the functionality of the water adsorber is judged based on the

A method for checking the functionality of a water adsorber in the exhaust of an internal combustion engine is provided. A sensor measures the temperature of the exhaust gases downstream in the flow direction from the water adsorber, and the functionality of the water adsorber is judged based on the change over time in the rate of increase in the sensed temperature after the internal combustion engine has been started.

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1. A method for determining a functionality of a water adsorber in an exhaust system of an internal combustion engine, comprising:sensing a temperature of exhaust gases downstream in a flow direction from the water adsorber; and judging the functionality of the water adsorber based on a change over

1. A method for determining a functionality of a water adsorber in an exhaust system of an internal combustion engine, comprising:sensing a temperature of exhaust gases downstream in a flow direction from the water adsorber; and judging the functionality of the water adsorber based on a change over time in a rate of increase in the sensed temperature after the internal combustion engine has been started. 2. A method for determining a functionality of a water adsorber in an exhaust system of an internal combustion engine, comprising:sensing a temperature of exhaust gases downstream in a flow direction from the water adsorber; and judging the functionality of the water adsorber based on a change over time in a rate of increase in the sensed temperature after the internal combustion engine has been started; wherein a slope of a temperature curve of the exhaust gases downstream from the water adsorber is calculated at various points in time, and wherein the water adsorber functionality is determined to be insufficient if the temperature curve shows a decreasing slope followed by an increasing slope. 3. A method for determining a functionality of a water adsorber in an exhaust system of an internal combustion engine, comprising:sensing a temperature of exhaust gases downstream in a flow direction from the water adsorber; and judging the functionality of the water adsorber based on a change over time in a rate of increase in the sensed temperature after the internal combustion engine has been started; wherein the water adsorber is determined to be incompletely functional if a decreasing slope for the rate of increase of the sensed temperature occurs in a predetermined temperature range. 4. The method according to claim 3, wherein the predetermined temperature range includes 70° C.5. The method according to claim 4, wherein the predetermined temperature range has a width of 20° C. to 50° C.6. The method according to claim 4, wherein the predetermined range extends symmetrically around 70° C.7. A method for determining a functionality of a water adsorber in an exhaust system of an internal combustion engine, comprising:sensing a temperature of exhaust gases downstream in a flow direction from the water adsorber; and judging the functionality of the water adsorber based on a change over time in a rate of increase in the sensed temperature after the internal combustion engine has been started; wherein the water adsorber is determined to be incompletely functional if a time period during which the sensed temperature remains within a predetermined range exceeds a predetermined threshold value. 8. A method for determining a functionality of a water adsorber in an exhaust system of an internal combustion engine, comprising:sensing a temperature of exhaust gases downstream in a flow direction from the water adsorber; and judging the functionality of the water adsorber based on a change over time in a rate of increase in the sensed temperature after the internal combustion engine has been started; wherein the water adsorber is determined to be incompletely functional if an average slope of a temperature curve of the sensed temperature is, up to a predetermined point in time, less than a predetermined threshold value. 9. A method for determining a functionality of a water adsorber in an exhaust system of an internal combustion engine, comprising:sensing a temperature of exhaust gases downstream in a flow direction from the water adsorber; judging the functionality of the water adsorber based on a change over time in a rate of increase in the sensed temperature after the internal combustion engine has been started; and calculating a first value for the temperature of the exhaust gas downstream from the water adsorber based on operating variables of the internal combustion engine using an assumption of a functional water adsorber; wherein a second value for the temperature of the exhaust gas downstream from the water adsorber is sensed, and wherein the water adsorber is judged to be incompletely functional if a difference between the sensed temperature and the temperature calculated from the operating variables of the internal combustion engine exceeds a predetermined value. 10. A method for determining a functionality of a water adsorber in an exhaust system of an internal combustion engine, comprising:sensing a temperature of exhaust gases downstream in a flow direction from the water adsorber; judging the functionality of the water adsorber based on a change over time in a rate of increase in the sensed temperature after the internal combustion engine has been started; and calculating a first value for the temperature of the exhaust gas downstream from the water adsorber based on operating variables of the internal combustion engine using an assumption of a non-functional water adsorber; wherein a second value for the temperature of the exhaust gas downstream from the water adsorber is sensed, and wherein the water adsorber is judged to be incompletely functional if a difference between the measured temperature and the temperature calculated from the operating variables of the internal combustion engine falls below a predetermined value. 11. A system for determining a functionality of a water adsorber in an exhaust system of an internal combustion engine, comprising:a sensor for sensing a temperature of exhaust gases downstream in a flow direction from the water adsorber; and an arrangement for determining the functionality of the water adsorber based on a change over time in a rate of increase in the sensed temperature after the internal combustion engine has been started.