Patent ID: 7926335

Claim:
A method for diagnosing a diverter valve of an internal combustion engine having a compressor, comprising: triggering the diverter valve, wherein the triggering takes place in such a way that a movement of the diverter valve in a direction of a closing position is expected; analyzing a variation over time of a charging pressure of the internal combustion engine resulting from the triggering of the diverter valve; determining an open jamming status of the diverter valve when the variation over time of the charging pressure is not plausible with an expected variation over time for a diverter valve moved in the direction of the closing position; and performing one of the following: (i) in the case of a transition from a higher load state of the internal combustion engine, in which state the diverter valve is triggered in the direction of the closing position, to a lower load state of the internal combustion engine, suspending a triggering of the diverter valve in an opening direction, performing a check to detect whether compressor pumping occurs as a result, and determining the open jamming status of the diverter valve if no compressor pumping occurs; and (ii) starting from an operating state with an opened diverter valve, triggering the diverter valve in the direction of the closing position, and determining the open jamming status of the diverter valve if no increase in the charging pressure above a predefined threshold value is detected as a result of the triggering of the diverter valve in the direction of the closing position.