초록 ▼

The invention relates to a control device of an engine, including fuel supplying means, target fuel supply amount setting means, fuel supply command value providing means, supplied air amount detection means, air-fuel ratio detection means, air-fuel ratio calculation means, exhaust gas component con

The invention relates to a control device of an engine, including fuel supplying means, target fuel supply amount setting means, fuel supply command value providing means, supplied air amount detection means, air-fuel ratio detection means, air-fuel ratio calculation means, exhaust gas component concentration detection means and exhaust gas component concentration calculation means. In the invention, the fuel supply command value or the fuel supply amount grasped therefrom is amended and the amount of the air detected by the supplied air amount detection means is amended such that the difference between the air-fuel ratio detected by the air-fuel ratio detection means and the air-fuel ratio calculated by the air-fuel ratio calculation means and the difference between the concentration of the specified component detected by the exhaust gas component concentration detection means and the concentration of the specified component calculated by the exhaust gas component concentration calculation means become small.

대표청구항 ▼

1. A control device of an engine, the control device comprising: a fuel injector that supplies fuel to a combustion chamber of the engine;an air flow meter configured to output a signal corresponding to an amount of air supplied to the combustion chamber;an air-fuel ratio sensor configured to output

1. A control device of an engine, the control device comprising: a fuel injector that supplies fuel to a combustion chamber of the engine;an air flow meter configured to output a signal corresponding to an amount of air supplied to the combustion chamber;an air-fuel ratio sensor configured to output a signal corresponding to an air-fuel ratio of a mixture gas formed in the combustion chamber; anda concentration sensor configured to output a signal corresponding to a concentration of a specified component of exhaust gas discharged from the combustion chamber; andan electronic control unit having control logic configured to cause the electronic control device to perform the following: provide a fuel supply command value to the fuel injector to make the fuel injector supply a target amount of the fuel to the combustion chamber;acquire the amount of the fuel supplied to the combustion chamber based on the fuel supply command value as a fuel supply amount;acquire the amount of the air supplied to the combustion chamber based on the output signal of the air flow meter as a detected air supply amount;acquire the air-fuel ratio based on the output signal of the air-fuel ratio sensor as a detected air-fuel ratio;calculate the air-fuel ratio based on the fuel supply amount and the detected air supply amount as a calculated air-fuel ratio;acquire the concentration of the specified component based on the output signal of the concentration sensor as a detected concentration;calculate the concentration of the specified component based on the fuel supply amount and the detected air supply amount as a calculated concentration; andamend the fuel supply command value or the fuel supply amount and the detected air supply amount such that the difference between the detected air-fuel ratio and the calculated air-fuel ratio and the difference between the detected concentration and the calculated concentration becomes substantially zero. 2. The control device of the engine as set forth in claim 1, wherein the specified component is a nitrogen oxide included in the exhaust gas. 3. The control device of the engine as set forth in claim 1, wherein the electronic control unit is further configured to: constitute an equation existing between the detected air-fuel ratio and the calculated air-fuel ratio, and constitute an equation existing between the detected concentration and the calculated concentration, by using a fuel supply amount amendment value, the fuel supply amount amendment value compensating for an error of the fuel supplied by the fuel injector, and by using an air supply amount amendment value, the air supply amount amendment value compensating for an error of the detected air supply amount;calculate the fuel supply amount amendment value and the air supply amount amendment value by solving a simultaneous equation consisting of the equations; andamend the fuel supply command value or the fuel supply amount by the fuel supply amount amendment value, and amend the detected air supply amount by the air supply amount amendment value to decrease the difference between the detected air-fuel ratio and the calculated air-fuel ratio, and the difference between the detected concentration and the calculated concentration. 4. The control device of the engine as set forth in claim 1, wherein the electronic control unit determines that a malfunction is occurring in the fuel injector when an amendment amount for the fuel supply command value is not within a possible range of the amendment amount for the fuel supply command value when no malfunction occurs in the fuel injector. 5. The control device of the engine as set forth in claim 2, wherein the electronic control unit determines that a malfunction is occurring in the air flow meter when an amendment amount for the detected air supply amount is not within a possible range of the amendment amount for the detected air supply amount when no malfunction occurs in the air flow meter. 6. The control device of the engine as set forth in claim 2, wherein the electronic control unit is further configured to: constitute an equation existing between the detected air-fuel ratio and the calculated air-fuel ratio, and constitute an equation existing between the detected concentration and the calculated concentration by using a fuel supply amount amendment value, the fuel supply amount amendment value compensating for an error of the fuel supplied by the fuel injector, and by using an air supply amount amendment value, the air supply amount amendment value compensating for an error of the detected air supply amount;calculate the fuel supply amount amendment value and the air supply amount amendment value by solving a simultaneous equation consisting of the equations; andamend the fuel supply command value or the fuel supply amount by the fuel supply amount amendment value, and amend the detected air supply amount by the air supply amount amendment value to decrease the difference between the detected air-fuel ratio and the calculated air-fuel ratio, and the difference between the detected concentration and the calculated concentration. 7. The control device of the engine as set forth in claim 2, wherein the electronic control unit determines that a malfunction is occurring in the fuel injector when an amendment amount for the fuel supply command value is not within a possible range of the amendment amount for the fuel supply command value when no malfunction occurs in the fuel injector. 8. The control device of the engine as set forth in claim 3, wherein the electronic control unit determines that a malfunction is occurring in the fuel injector when an amendment amount for the fuel supply command value is not within a possible range of the amendment amount for the fuel supply command value when no malfunction occurs in the fuel injector. 9. The control device of the engine as set forth in claim 2, wherein the electronic control unit determines that a malfunction is occurring in the air flow meter when an amendment amount for the detected air supply amount is not within a possible range of the amendment amount for the detected air supply amount when no malfunction occurs in the air flow meter. 10. The control device of the engine as set forth in claim 3, wherein the electronic control unit determines that a malfunction is occurring in the air flow meter when an amendment amount for the detected air supply amount is not within a possible range of the amendment amount for the detected air supply amount when no malfunction occurs in the air flow meter. 11. The control device of the engine as set forth in claim 4, wherein the electronic control unit determines that a malfunction is occurring in the air flow meter when an amendment amount for the detected air supply amount is not within a possible range of the amendment amount for the detected air supply amount when no malfunction occurs in the air flow meter.