Patent ID: 7581521
Filing Date: 2009-09-01
Classification: B60R

Abstract:
1. A driving authorization system having an electronic immobilizer coupled to a rotary shaft sensor that senses at least one of position and rotational speed of the rotary shaft by means of a pickup wheel arranged thereon and transmits said at least one of position and rotational speed to a vehicle control unit which enables the electronic immobilizer function; wherein: the pickup wheel comprises a predefined number of teeth which are distributed along the circumference of the pickup wheel according to code, and generate an encoded rotational speed signal that is picked up by the rotary shaft sensor and decoded by the vehicle control unit; the vehicle control unit enables the immobilizer function only after successful decoding of the encoded rotational speed signal; and a synchronization time for detecting a specific position of the rotary shaft is part of the encoded rotational speed signal.