| 主权项 |
1. A method for defining a reference position of a power steering system, said power steering system comprising at least one movable steering member whose position varies according to the orientation given to the steering system, said method comprising:
a tracking step (a), during which an index pulse is generated when the movable steering member passes by a predetermined position, called indexed position, a processing step (b), during which the index pulse is analyzed in order to detect a rising edge and/or a falling edge therein, a characterization step (c) during which a value called edge position, which is representative of the position occupied by the movable steering member when said edge is produced, is associated to the rising or falling edge identified during the processing step (b),wherein
the tracking (a), processing (b), and characterization (c) steps are repeated, on the one hand, for a first index pulse which is generated when the movable steering member crosses the indexed position in a first direction of displacement, and on the other hand, for a second index pulse which is generated when said movable steering member crosses this same indexed position in a second direction of displacement, opposite to the first direction of displacement, so as to acquire, respectively, on the one hand, a first edge position, which corresponds to a first edge generated in the first direction of displacement, and on the other hand, a second edge position, which corresponds to a second edge which is generated in the second direction of displacement and which is of the same rising or falling nature as the first edge, and wherein said method includes a step (d) of calculating a reference position during which a reference position of the power steering system is calculated from the first edge position and from the second edge position. |
