| 摘要 |
PURPOSE:To supply the mixed gas with the optimum air-fuel ratio into an engine by forming an air passage which bypasses the upstream side and the downstream side of a throttle valve in an intake passage and an air control valve which is driven by negative pressure and controls the air flow rate in the air passage. CONSTITUTION:An air passage 5 which bypasses the upstream side and the downstream side of the throttle valves 4a and 4b in intake passages 2a and 2b and an air control valve 8 which is driven by negative pressure and controls the air flow-rate in the air passage 5 are provided. A pressure control modulator 18 in the combination of a pressure adjustor 15 for adjusting the intake negative pressure to a certain pressure and a pressure control valve 17 which is electromagnetically driven is installed into a negative pressure passage 13. Therefore, the mixed gas with the optimum air-fuel ratio can be supplied into an engine.
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