A control system for a hybrid powertrain includes an engine start detector that detects when an engine of the hybrid powertrain is activated via an electric motor during an auto start. An image forming apparatus is configured to include an intermediate transfer body to which a toner imager is transferred from an image carrier, the intermediate transfer body having an elastic surface layer having a center point average roughness of 0. A chemical core transition section is disposed between the other end of the first core section and the second core section, to insure that the reaction front propagates properly.