Method for identifying defective injection of urea into a vehicle exhaust line
AssigneeVitesco Technologies GmbH
InventorsSylvain Sirop, Stéphan Vales
Life of this patent
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Abstract
A method for identifying a fault in the injection of urea into an exhaust line of a vehicle fitted with an internal combustion engine, the method having the following steps: calculating a ratio between a measured filling time and a flushing time of a urea line, the calculation being carried out by a urea injection control unit; comparing the calculated ratio to a reference ratio by the urea injection control unit; if the calculated ratio is different than the reference ratio, identifying a urea injection fault in the urea line by the urea injection control unit.
Claims10
A method for identifying a fault in the injection of urea into an exhaust line of a vehicle fitted with an internal combustion engine, the method comprising:
- flushing a urea line by a pump connected to said urea line, said pump operating at a constant determined rotational speed;
- filling said urea line by said pump, said pump operating at said constant determined rotational speed;
- measuring a filling time of said urea line, said filling time being formed by a time needed to reach a predetermined maximum pressure in said urea line;
- said measurement being taken by a urea injection control unit;
- calculating a ratio between said measured filling time and a flushing time of said urea line, said calculation being carried out by said urea injection control unit,
- comparing said calculated ratio to a reference ratio by said urea injection control unit,
- if said calculated ratio is different than said reference ratio, identifying and providing information about a urea injection fault in said urea line by said urea injection control unit.
Dependencies are inferred from the claim text.