Contact washer system and method for controlling a windscreen wiper motor

The contact-disk system as recited in one of the preceding claims, wherein

• a first state (A) corresponds to an upper reversing position,
• a second state (B) corresponds to a wiping field,
• a third state (C) is a state before a park position,
• a fourth state (D) is a park position,
• a fifth state (E) is a state after a park position, and
• a sixth state (F) is an extended park position.

The contact-disk system as recited in one of the preceding claims, wherein

• in the first state (A), a first path (A1) is electrically conductive, and a second path (A2) is electrically insulating,
• in the second state (B), the first path (B1) and the second path (B2) are electrically conductive,
• in the third state (C), the first path (C1) and the second path (C2) are electrically insulating,
• in the fourth state (D), the first path (D1) is electrically insulating and the second path (D2) is electrically conductive,
• in the fifth state (E), the first path (E1) and the second path (E2) are electrically conductive, and
• in the sixth state (F), the first path (F1) is electrically conductive and the second path (F2) is electrically insulating, and
• the states occur consecutively in the order of their numbering.

A method for controlling a windshield-wiper motor having a contact-disk system, in which a plurality of paths (12, 14) of a rotatable contact disk (10) is contacted by a plurality of contact elements,

• the paths having electrically conductive segments (A1, B1, B2, D2, E1, E2, F1) and electrically insulating segments (A2, C1, C2, D1, F2), and
• logic states are encoded by the electrically conductive segments (A1, B1, B2, D2, E1, E2, F1) and the electrically insulating segments (A2, C1, C2, D1, F2), wherein
• the contact disk (10) has n paths (12, 14), with n≧2, and
• N logic states are encoded by the N paths (12, 14) and by the sequence of electrically conductive segments (A1, B1, B2, D2, E1, E2, F1) and of the electrically insulating segments (A2, C1, C2, D1, F2), with N>2n.