Abstract: To provide a control device capable of setting a plurality of combustion parameters changing a combustion state of an internal combustion engine to appropriate values and improving a fuel consumption rate regardless of an operation state. An engine ECU 70 sets a combustion parameter (main injection timing, pilot injection timing, fuel injection pressure, turbocharging pressure, or the like) such that a center-of-gravity position of a heat generation rate becomes a constant target crank angle regardless of a load of an engine 10. In addition, the ECU 70 estimates the center-of-gravity position of a heat generation rate based on an output of an in-cylinder pressure sensor 64 and feedback-controls the combustion parameter such that the estimated center-of-gravity position of a heat generation rate becomes equal to the target crank angle.

Abstract: A control apparatus of an internal combustion engine performs control to warm up a catalyst. More specifically, the control apparatus keeps a wastegate valve open when the temperature of the catalyst is less than a predetermined temperature and closes the wastegate valve when the temperature of the catalyst becomes equal to or greater than the predetermined temperature. The control apparatus executes control to increase and decrease the fuel injection quantity such that the internal combustion engine alternately switches between lean burn and rich burn when the wastegate valve is closed. Accordingly, rich gas and lean gas can be reliably mixed in the catalyst, and CO can be reliably combusted in the catalyst. Therefore, the catalyst can be promptly warmed up while CO, HC, and the like can be appropriately suppressed from flowing through the catalyst.

Abstract: When an operation of a fuel cell system (100) is stopped, a flow of cathode off-gas into a circulation passage (28) is stopped. A stopped state of the flow of the cathode off-gas into the circulation passage (28) is held even after a start-up of the system (100) until the fuel cell (10) is brought into a predetermined state. Such structure prevents an outlet (52) of a three-way valve (50) from being frozen in an opened state. Accordingly the cathode off-gas that contains large amount of water and nitrogen hardly flows into the fuel cell (10) accidentally. This makes it possible to restrain various types of trouble, for example, generation of flooding upon start-up of the system, decrease in the oxygen partial pressure, and decrease in the power generation efficiency resulting therefrom.