| 摘要 |
PURPOSE:To render the fuel consumption economical and reasonable, by controlling the fuel injection quantity automatically over a wide range of engine operation from rapid increase of the output to slow increase of the same by imparting an acceleration pump with a function capable of metering the quantity of fuel to be supplied corresponding to the speed of operation of an output control means. CONSTITUTION:A small hole 3 is formed to communicate with an acceleration pump. At the time of rapid increasing of the output, pressure of fuel in a pump chamber 2 is increased by the rapid downward movement of a pump plunger 1, so that part of the fuel flows back into a fuel supply passage 6 through the small hole 3. However, since the hole 3 is so small, the resistance to the fuel flow through the hole 3 is fairly great, so that most of fuel is ejected into a carburetor by forcing a discharge valve 4 open. At the time of slow increasing of the output, on the other hand, the quantity of fuel passed through the small hole 3 is increased relatively while the quantity of fuel ejected from a nozzle 7 of the acceleration pump is decreased. Thus, the quantity of fuel ejected from the acceleration pump can be controlled automatically. |
