Vehicle seat arrangement with an electric adjustment mechanism

Vehicle seat arrangement, comprising:

• a) at least one electric adjustment mechanism;
• b) at least one vehicle seat component;
• c) at least one direct current motor provided for the adjustment of the at least one vehicle seat component, the direct current motor including direct current terminals configured for receiving a motor current;
• d) a control device for controlling or regulating the at least one direct current motor, and the control device applies a direct current to the direct current terminals, in use, based upon the adjustment speed to be set;
• e) the control device actuates the at least one direct current motor device upon receiving a comfort adjustment signal, in use, for providing a gradual comfort adjustment of the at least one vehicle seat component;
• f) the control device activates the at least one direct current motor upon receiving a pre-crash signal, in use, for providing a rapid pre-crash adjustment of the at least one vehicle seat component from an initial position to a safe pre-crash position;
• g) a memory device provided for storing adjustment data for the safe pre-crash position and the initial position, the memory device being configured for storing adjustment data prior to the pre-crash adjustment, in use;
• h) the control device activates the at least one direct current motor upon receiving a pre-crash signal, in use, and implements the rapid pre-crash adjustment at a load and an acceleration that are the maximum permissible load and acceleration for the at least one direct current motor at a respective operating point, in use;
• i) the at least one direct current motor including at least one winding which is connected to the direct current terminals, and a permanent magnet unit;
• j) a family of characteristic curves of the at least one direct current motor has at least one range, in which motor currents occur that are greater than a limiting current intensity which is critical for maintaining the magnetization of the permanent magnet unit;
• k) current-limiting circuitry provided for the purpose of limiting the motor current that flows through the at least one winding at the critical limiting current intensity or below the critical limiting current intensity;
• l) an unacceptable range of the at least one range, in which motor currents occur that are greater than a limiting current intensity, occurs at low motor speeds and at high motor torque;
• and
• m) the unacceptable range is relevant during the start-up of the at least one direct current motor in the event of a pre-crash adjustment, in use, and is excluded by the current-limiting circuitry.