METHOD FOR DIAGNOSING A FAULT OF AN SCR SYSTEM
First Claim
1. A method for diagnosing a fault in a selective catalytic reduction system connected to a diesel engine, the selective catalytic reduction system having an electric driven transportation device for providing a mass flow of a Diesel Exhaust Fluid into the selective catalytic reduction system, said method comprising:
- applying an electric signal to the electric driven transportation device for establishing the mass flow;
monitoring a parameter value of the electric signal;
monitoring the mass flow provided into the selective catalytic reduction system caused by the electric driven transportation device when it is driven with said electric signal;
determining for the mass flow a difference between the parameter value of the electric signal a corresponding parameter value stored in a data map, said data map containing values of said corresponding parameter value that are correlated with the mass flow achieved by said electric driven transportation device when it is driven with the electric signal having the parameter value; and
diagnosing the fault in the selective catalytic reduction system if the difference exceeds a threshold.
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Accused Products
Abstract
A method is provided for diagnosing a fault in a selective catalytic reduction system having an electric driven transportation device that provide a mass flow of a Diesel Exhaust Fluid into the selective catalytic reduction system. The method includes, but is not limited to applying an electric signal to the transportation device for establishing the mass flow, monitoring a parameter value of the electric signal, monitoring the mass flow provided into the selective catalytic reduction system caused by the transportation device when it is driven with the signal, determining, for the monitored mass flow, the difference between the corresponding parameter value, and a corresponding parameter value stored in a data map.
9 Citations
14 Claims
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1. A method for diagnosing a fault in a selective catalytic reduction system connected to a diesel engine, the selective catalytic reduction system having an electric driven transportation device for providing a mass flow of a Diesel Exhaust Fluid into the selective catalytic reduction system, said method comprising:
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applying an electric signal to the electric driven transportation device for establishing the mass flow; monitoring a parameter value of the electric signal; monitoring the mass flow provided into the selective catalytic reduction system caused by the electric driven transportation device when it is driven with said electric signal; determining for the mass flow a difference between the parameter value of the electric signal a corresponding parameter value stored in a data map, said data map containing values of said corresponding parameter value that are correlated with the mass flow achieved by said electric driven transportation device when it is driven with the electric signal having the parameter value; and diagnosing the fault in the selective catalytic reduction system if the difference exceeds a threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A computer readable medium embodying a computer program product, said computer program product comprising:
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a diagnostic program for diagnosing a fault in a selective catalytic reduction system connected to a diesel engine, the selective catalytic reduction system having an electric driven transportation device for providing a mass flow of a Diesel Exhaust Fluid into the selective catalytic reduction system, the diagnostic program configured to; apply an electric signal to the electric driven transportation device for establishing the mass flow; monitor a parameter value of the electric signal; monitor the mass flow provided into the selective catalytic reduction system caused by the electric driven transportation device when it is driven with said electric signal; determine for the mass flow a difference between the parameter value of the electric signal a corresponding parameter value stored in a data map, said data map containing values of said corresponding parameter value that are correlated with the mass flow achieved by said electric driven transportation device when it is driven with the electric signal having the parameter value; and diagnose the fault in the selective catalytic reduction system if the difference exceeds a threshold. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification