Patent ID: 7983831

Claim:
A control apparatus for an internal combustion engine, wherein a fuel feed chamber and a residual fuel chamber that can be selectively connected to and disconnected from each other are provided in a fuel tank, when the fuel tank is refueled, the fuel feed chamber and the residual fuel chamber, which have been connected so far, are disconnected from each other and fuel is then fed only into the fuel feed chamber to refuel the fuel tank; when the internal combustion engine is restarted after the refueling of the fuel tank, only the fuel in the residual fuel chamber is supplied to the internal combustion engine while the fuel feed chamber and the residual fuel chamber remain disconnected from each other and the internal combustion engine is controlled in accordance with the property of the fuel in the residual fuel chamber, which has been determined in advance; the fuel in the fuel feed chamber and the fuel in the residual fuel chamber are supplied to the internal combustion engine at a predetermined ratio in response to a predetermined condition coming into effect after the restart of the internal combustion engine and the property of the mixture of the fuels supplied to the internal combustion engine at the predetermined ratio is determined based on the present value of an engine state amount, the average property of the fuel in the fuel feed chamber and the fuel in the residual fuel chamber is determined based on the property of the mixture of the fuels supplied to the internal combustion engine at the predetermined ratio and the property of the fuel in the residual fuel chamber, which has been determined in advance, the fuel feed chamber and the residual fuel chamber are connected to each other to allow the fuel in the fuel feed chamber and the fuel in the residual fuel chamber to be mixed with each other in the fuel tank, and the mixture of the fuels in the fuel tank is supplied to the internal combustion engine from at least one of the fuel feed chamber and the residual fuel chamber and the internal combustion engine is controlled in accordance with the determined average property.