| 摘要 |
PURPOSE:To prevent generation of reverse torque based on self ignition so as to easily start an engine, by decreasing the concentration of oxygen in the air of rich oxygen when the engine is at a high temperature further at starting. CONSTITUTION:An oxygen rich air supplier 13, equipping a feed pump 16, oxygen permeating film 15, suction pump 13 and an oxygen concentration control valve 18 and bypassing an opening and closing valve 12, is provided in a main intake passage 2 of an engine 1. Detected values of an engine temperature detector 25, engine start detector 26, load detector 27, oxygen concentration detector 28, etc. are input to a control circuit 8, and when the engine 1 is at a temperature above a prescribed value further at its starting, the opening and closing valve 12 is operated to be opened through an oxygen concentration controller 29. As a result, oxygen rich air from the oxygen rich air supplier passage 13 is diluted with ordinary air from the main intake passage 2, causing the concentration of oxygen to decrease. |
