A resolver reference position adjustment method is capable of minimizing a detection error in the rotation angle of a rotor of a motor. The apparatus has a flat plate for forcing the lower tube being inserted into ground easily. Preferably, the third portion of the blade has a serpentine shape that consistently results in desired constant-force spring characteristics over a nominal range of blade travel. Each locking mechanism is operable to transition between a locking position and an unlocking position and opening the cover to permit the passage of fluid requires that both locking mechanism be in their respective unlocking positions. A moment output of or drawn by the electrical machine is impressed on a moment of the engine that is demanded by an engine control unit, as a function of an operating state of the exhaust gas cleaning device. The fiber optic connection panel is disposed on the internal surface of the terminal cover such that when the terminal cover is closed, the fiber optic connection panel is disposed within the optical fiber perimeter.