| 摘要 |
PURPOSE:To form an acutator to small size and improve safety of a quality improved gas as a driving source of the actuator for driving a gas valve controlling a flow of the quality improved gas and air valve controlling an intake air quantity. CONSTITUTION:Quality improving alcohol is heated by a quality improver 4 through an alcohol passage 7 and supplied to an engine 1 through a gas passage 11 and gas valve 31. While a flow of air is controlled by a primary air valve 15 and secondary valve 51, and the air is supplied to the engine 1. Quality improved gas is guided through a servo valve 41 to a pressure working chamber 40 of an actuator driving the valves 31 and 51. Pressure of the quality improved gas in the chamber 40 is controlled in accordance with an opening time of the valve 41 to control openings of the valves 31, 51. In this way, the actuator is formed to small size at a low cost and safety of the quality improver is improved. |
