| 摘要 |
PURPOSE:To restrain an air-fuel ratio of supply mixture from richness, by controlling the purge control valve installed in a purge passage for fuel vapor so as to open it when an engine is in a hot intake air temperature state. CONSTITUTION:A suction secondary air supply passage 8 is installed so as to be reached to the inside of a suction manifold 4 at the more downstream than a throttle valve 3 of a carburetor 1, from the vicinity of an air discharge port of an air cleaner 2, and a linear type solenoid valve 9 is installed in the point midway in this passage 8. And, there is provided with a canister 35 with a built-in fuel adsorbent 35a adsorbing the fuel vapor produced in a fuel tank 36; this canister is interconnected to the suction manifold 4 via a purge passage 38. Inside this purge passage 38, there is provided with an on-off type solenoid valve 39 which is closed when intake air temperature to be detected by an intake air temperature sensor 13 is judged to be a hot intake air temperature state of more than the specified temperature, but it is controlled so as to be opened when judged not to be in the hot intake air temperature state.
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