FIELD: machine engineering.
SUBSTANCE: amount of reductant, adsorbed on the NOx catalytic converter, when the reductant supply device is in good order, and the corresponding detected value are estimated. The corresponding detected value is detected by the NOx sensor, and the detected value corresponds to each amount of reductant, adsorbed on the NOx catalytic converter. When the estimated adsorption value is greater than or equal to the first value and is less than or equal to the second value, diagnostics of the NOx catalytic converter based on the detected value of the NOx sensor is prohibited. The first value is the amount of adsorbed reductant corresponding to the minimum value of the corresponding detected value. The second value is the amount of the adsorbed reductant corresponding to the corresponding detected value when the amount of adsorbed reductant is zero and greater than the first value.
EFFECT: preventing the decrease in the accuracy of diagnostics.
8 cl, 24 dwg
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