| 摘要 |
PURPOSE:To prevent over rich of air fuel ratio at the low speed, by flowing back vaporizing fuel adsorbed to the canister to the suction pipe through the negative pressure respons type control valve and the delayed valve, permitting to flow back gradually in accordance with the change of negative pressure. CONSTITUTION:Vaporizing fuel produced in the fuel supply system is led to adsorb into the canister 1 through the pipe 2. The canister 1 is connected to the suction path 3 through the conduit 4, negative pressure response type control valve 6, and conduit 4. The negative pressure chamber 7 of the control valve 6 is connected to the path 3 by the negative pressure port 9 in the slight upstream of shutting position of throttel valve 5 through the negative pressure pipe 8 having delayed valve 10, when the suction pipe negative pressure at the low speed is increased, the negative pressure is led gradually into the chamber 7 by the delayed valve 10, adsorbed fuel of the canister 1 is flowed back to the path 3. The ignision timing is advanced with the negative pressure led into the ignition timing control equipment 13. |
