| 摘要 |
PURPOSE:To obtain the proper air-fuel ratio in the whole operation range by allowing the main air bleed of a pressurization type carburetor to communicate to the inlet side of a turbocharger and controlling the amount of bleeded air according to the difference of the supercharge pressure in the upstream and downstream sides of the carburetor. CONSTITUTION:When the air pressurized is supplied into a carburetor 3 by a turbocharger, the pressure in the upstream side of the carburetor 3 acts into the diaphragm chamber 16b of an actuator 16, and the pressure in the downstream side of the carburetor 3 acts into the diaphragm chamber 16c through a passage 18 and a check valve 17. When the pressure in the diaphragm chamber 16b becomes larger by a prescribed value or more in comparison with the pressure in the diaphragm chamber 16c, the needle valve 15 of the actuator 16 is opened to allow an adjusting passage 13 to communicate to an air cleaner on the inport side of the turbocharger. Therefore, the internal pressure of a chamber 11 lowers, and the amount of the bleeded air reduced, and air-fuel ratio can be obtained in the whole operation range.
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