Patent ID: 6684629
Filing Date: 2004-02-03
Classification: B01D

Abstract:
A method for checking the conversion capacity of a catalytic element for cleaving ozone, which is arranged in a vehicle and is exposed to an ambient-air stream, a first ozone sensor being arranged upstream of the catalytic element in the ambient-air stream to record upstream ozone concentrations, and a second ozone sensor being arranged downstream of the catalytic element in the ambient-air stream to record downstream ozone concentrations, the method comprising the steps of:evaluating predetermined enable conditions necessary for the checking to proceed, if the enable conditions are satisfied, recording the values emitted by the first and second ozone sensors, comparing the values emitted by the first and second ozone sensors with one another and determining a variable which represents an uncorrected value for the quality of the conversion capacity where the variable is weighted as a function of at least one operating parameter of the vehicle, comparing the weighted variable with a predetermined threshold value and, if the threshold value is exceeded, concluding that the conversion capacity of the catalytic element is insufficient.