Method and device for detecting the blockage of a gasoline vapor filter purge valve

摘要

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.

主权项

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.