Patent ID: 8161954

Claim:
A fuel supply control apparatus for an engine that is capable of using alcohol, gasoline and alcohol-gasoline mixture as fuel, the fuel supply control apparatus comprising: an alcohol concentration detector adapted to detect alcohol concentration of fuel an engine temperature detector adapted to detect engine temperature; first increase correction means for correcting an amount of fuel supplied to the engine such that the amount of fuel is increased as the detected alcohol concentration becomes higher; second increase correction means for correcting the amount of fuel supplied to the engine such that the amount of fuel is increased as the detected engine temperature becomes lower and also as the detected alcohol concentration becomes higher; air-fuel ratio feed-back correction means for feed-back correcting the amount of fuel supplied to the engine by using a feed-back correction value such that an actual air-fuel ratio of the engine becomes closer to a theoretical air fuel ratio, when the actual air-fuel ratio is lower than the theoretical air fuel ratio, the feed-back correction value indicating a lean value that corresponds to an amount, which is used to reduce the amount of fuel supplied to the engine such that the actual air-fuel ratio is increased to the theoretical air fuel ratio; and water mixture correction means for determining that water is mixed with fuel when the feed-back correction value used during a cold operational state of the engine indicates the lean value greater than the lean value of the feed-back correction value used during a warm operational state of the engine, wherein: the water mixture correction means reduces the increased amount of fuel, which is increased based on the detected alcohol concentration, when the water mixture correction means determines that water is mixed with fuel.