Fuel control device for engine having disconnectable groups of cylinders

A fuel control device for an engine having disconnectable groups of cylinders, comprising:

• valve change-over means for selectively activating or de-activating at least either intake or exhaust valves of the engine;
• operation mode selecting means for selecting either a partial cylinder operation mode or a full cylinder operation mode, in which the intake or exhaust valves are selectively activated or de-activated, as a target operation mode on the basis of engine operating information;
• valve change-over control means for selectively operating the valve change-over means so as to operate the engine in the target operation mode selected by the operation mode selecting means;
• fuel supply means for selectively supplying fuel to engine cylinders according to the selected target operation mode;
• mode change confirming means for confirming whether or not the partial cylinder operation mode is reliably changed by the valve change-over means over to the full cylinder operation mode, and issuing a mode change confirming signal;
• and
• fuel supply control means for controlling the fuel supply means to operate in the partial cylinder operation mode when the operation mode selecting means selects the full cylinder operation mode as the target operation mode and when the mode change confirming signal issued by the mode change confirming means indicates incomplete change-over from the partial cylinder operation mode to the full cylinder operation mode.