| 摘要 |
PURPOSE:To suppress a wall flow of fuel from being formed in the internal wall of an intake pipe, by separating an intake passage into a primary passage of small contour and a secondary passage of large contour and opening an outlet part of the primary passage as a Laval nozzle to a Venturi throat part of the secondary passage. CONSTITUTION:An engine provides a Venturi 13 in the half way of a secondary passage 12 connecting with an intake pipe collective part 9 while a primary passage 15, which connects the upstream side of a pressure control valve 24 in said passage 12 with a throat part 13A of the Venturi 13, for a throttle body 11 forming linear vaporization space 14 in the downstream side of the Venturi 13. The engine, forming a Laval nozzle 17 in an outlet part 16 of said passage 15, provides a fuel supply nozzle 18 in the upstream side of the nozzle 17. And the engine, providing throttle valves 22, 23 in each passage 12, 15, operates these valves interlocking to each other so as to decrease opening proportion in a secondary side as compared with that in a primary side in a low load range while increase opening proportion reversely to the above in a high load range.
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