Method and device for detecting the blockage of a gasoline vapor filter purge valve
View Patent ↗A method for detecting the blockage of a gasoline vapor filter ( 3 ) bleed valve ( 4 ) for a motor vehicle internal combustion engine ( 1 ), includes at least one sequence of the following steps: a step of controlling the opening of the bleed valve ( 4 ), a step of measuring at least one operating parameter of the internal combustion engine ( 1 ), which is related to the mixture taken into the engine, a step of calculating an indicator, via statistical signal-processing on at least one measured parameter, and of comparing the indicator to a predetermined value. A detection device capable of implementing the method is described.
1. A method for detecting blockage of a purge valve of a gasoline vapor filter for a vehicle internal combustion engine,
the method comprising at least one sequence of the following steps:
changing a state of the purge valve,
measuring at least one operating parameter of the internal combustion engine that is connected with a mixture admitted to said engine, and
calculating an indicator, by statistical signal processing of at least one measured parameter, and of comparing this indicator against a predetermined value,
wherein said calculating an indicator comprises measuring a level of noise corresponding to at least one operating parameter of the internal combustion engine connected with the mixture admitted to said engine, before and after a change in state of the purge valve.
2. The method as claimed in claim 1 , wherein the operating parameter of the internal combustion engine is measured at an air intake manifold of the engine.
3. The method as claimed in claim 1 , wherein the operating parameter of the internal combustion engine is measured using a lambda probe.
4. The method as claimed in claim 1 , further comprising repeating the steps as described above in order to obtain a measurement that is statistically significant.
5. The method as claimed in claim 4 , wherein the operating parameter of the internal combustion engine is measured at an air intake manifold of the engine.
6. The method as claimed in claim 4 , wherein the operating parameter of the internal combustion engine is measured using a lambda probe.
7. The method as claimed in claim 1 , further comprising filtering the level of noise on a studied parameter then integrating this level of noise, over a determined duration after a change in state of the purge valve, then comparing this integrated value against a predetermined threshold.
8. The method as claimed in claim 7 , wherein the operating parameter of the internal combustion engine is measured at an air intake manifold of the engine.
9. The method as claimed in claim 7 , wherein the operating parameter of the internal combustion engine is measured using a lambda probe.
10. The method as claimed in claim 7 , comprising repeating the steps as described above in order to obtain a measurement that is statistically significant.
11. The method as claimed in claim 10 , wherein the operating parameter of the internal combustion engine is measured at an air intake manifold of the engine.
12. The method as claimed in claim 10 , wherein the operating parameter of the internal combustion engine is measured using a lambda probe.