Daimler Ag

Hermann Von Hasseln

Sylvain Subileau

Juergen Luka

Andreas Krueger

Thomas Hartmann

Staas Gietzen

Andreas Krüger

A drive authorization system for an electric drive includes a predefined number of field coils and a rotationally movable element. An evaluation and control unit for operation of the electric drive determines the current position of the movable element from several items of positional information, which can be made available by a predefined number of angle of rotation sensors. To implement an electronic immobilization function, positions, the number of the active rotation angle sensors, or both those positions and that number are made encodable. The evaluation and control unit decodes the encoded positional information of the active rotation angle sensors in order to determine the current position of the movable element. Operation of the electric drive is possible only after successful decoding of the positional information.

Drive authorization system for an electric drive

A driving authorization system comprises an electronic immobilizer function which is coupled to a rotary shaft sensor. The rotary shaft sensor senses the position and/or rotational speed of the rotary shaft by means of a pickup wheel arranged on a rotary shaft, and transmits that information to a vehicle control unit which enables the electronic immobilizer function. According to the invention, the pickup wheel comprises a predefined number of teeth which are arranged distributed along the circumference of the pickup wheel according to a code, and an encoded rotational speed signal which is picked up by the rotary shaft sensor and can be decoded by the vehicle control unit. The vehicle control unit enables the immobilizer function only after successful decoding of the encoded rotational speed signal. A synchronization time for detecting a specific position of the rotary shaft is part of the encoded rotational speed signal.

Driving authorisation system comprising an electronic immobiliser function

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Filderstadt, Germany

Hermann Von Hasseln