| 摘要 |
A system (10) including a vapor concentration sensor (20) for regulating the flow of gasoline vapor from a storage canister. The sensor (20) comprises a passage means (22,30,24) for establishing a preferred flow path (14) for said vapor. A vapor sensitive electrically conductive material (20) is disposed in the passage the material changes in size in accordance with the concentration of hydrocarbons in said vapor to vary its resistance, and a control circuit (78) connected to the material for measuring its resistance. |
