When output voltage V1 of an electric power converter reaches a prescribed voltage V1*ref, a difference between V1 and V1*ref is integrated to correct a commanded torque to \u03c4o*. Also, the use of the aldehyde as perfuming ingredient to impart odor notes of the aldehyde, lily of the valley type. The bell comprises a first end and a second end, the first end coupled to the first conduit.