Method for identifying defective injection of urea into a vehicle exhaust line
AssigneeVitesco Technologies Gbmh
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 an 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 the urea injection fault in said urea line said urea injection control unit.
Dependencies are inferred from the claim text.