| 摘要 |
PURPOSE:To make the mixture gas in layers in the light load range more certainly as well as to reduce the pumping loss by delaying the closing timing of both of the main and aux. suction valves as the engine is going to bear heavier load, and thereby controlling the filling efficiency of the suction gas. CONSTITUTION:Main suction passage 7 is connected with the combustion chamber 5 and opened and closed by a main suction valve 8 in linkage with the suction stroke of engine 1. The downflow end of an aux. suction passage 9 has an opening in said main suction passage 7 overstream the main suction valve 8, and this opening is opened and closed by an aux. suction valve 10 in synchronization with the crank shaft of the engine 1. Further, the main suction passage 7 is equipped with a carburettor 11 for supply of the mixture gas. Here the aux. suction valve 10 is opened and closed by a control means 25 on the basis of the crank angle signal and accelerator operation signal, while the main suction valve 8 is opened and closed by a control means 27 on the basis of the operation amount signal about the accelerator pedal 26. The closing timing of both suction valves 8, 10 is delayed more as the load becomes heavier. |
