Enging fuel control device and control method for requested idle air quantity

An engine fuel control device, comprising:

• a fuel supply means that supplies an engine with a fuel;
• a mixture ratio determination means that determines a mixing ratio of the fuel and air;
• a mixture introduction means that introduces the air-fuel mixture, whose mixing ratio has been established, into the engine;
• a flow rate determination means that determines a flow rate of the mixture of the fuel and air to be drawn in by the engine;
• a first throttle valve that is disposed in an intake pipe of the engine;
• a bypass passage that bypasses the first throttle valve;
• a second throttle valve that is disposed in the bypass passage;
• a starting phase determination means that determines whether the engine is in a pre-start phase or a post-start phase;
• a first opening setting means that sets the opening of the second throttle valve before starting;
• a second opening setting means that sets the opening of the second throttle valve after starting;
• and
• a target opening setting means that sets at least one target opening for the second throttle valve opening when the engine shifts from the pre-start phase to the post-start phase.