Control device and control system of internal combustion engine

An internal combustion engine control device controlling an injection mode of fuel injected from an injector provided in an internal combustion engine and a condition of an intake air, which flows into a combustion chamber of the internal combustion engine and which is mixed with the fuel, the control device comprising;

• a cylinder pressure obtaining unit for obtaining a cylinder pressure sensing value from a cylinder pressure sensor that senses pressure in the combustion chamber;
• a fuel pressure obtaining unit for obtaining a fuel pressure sensing value from a pressure sensor that senses pressure of the fuel fluctuating in connection with the fuel injection from the injector;
• a combustion characteristic calculating unit for calculating a combustion characteristic concerning combustion in a cylinder based on both of the obtained sensing values of the cylinder pressure sensing value and the fuel pressure sensing value;
• a controlling unit for controlling the injection mode and the intake air condition in accordance with the combustion characteristic calculated by the combustion characteristic calculating unit;
• an ignition timing calculating unit for calculating ignition timing based on the cylinder pressure sensing value;
• and
• an injection start timing calculating unit for calculating injection start timing of the fuel based on the fuel pressure sensing value, wherein
• the combustion characteristic calculating unit calculates an ignition delay from an injection start to an ignition as the combustion characteristic based on the calculated ignition timing and the calculated injection star timing;
• when the internal combustion engine is in a steady operation state, the controlling unit controls the intake air condition to a condition restricting the combustion if the ignition delay is shorter than an assumed time and controls the intake air condition to a condition promoting the combustion if the ignition delay is longer than the assumed time;
• the internal combustion engine has a supercharger for supercharging the intake air with the use of the exhaust gas as a source of a driving force,
• the supercharger is configured to be able to vary a conversion rate, at which the supercharger converts a fluid energy of the exhaust gas into the driving force, thereby adjusting supercharging pressure, and
• the controlling unit controls the conversion rate to decrease the supercharging pressure when the ignition delay is shorter than the assumed time and controls the conversion rate to increase the supercharging pressure when the ignition delay is longer than the assumed time.

An internal combustion engine control device controlling an injection mode of fuel injected from an injector provided in an internal combustion engine and a condition of an intake air, which flows into a combustion chamber of the internal combustion engine and which is mixed with the fuel, the control device comprising:

• a cylinder pressure obtaining unit for obtaining a cylinder pressure sensing value from a cylinder pressure sensor that senses pressure in the combustion chamber;
• a fuel pressure obtaining unit for obtaining a fuel pressure sensing value from a fuel pressure sensor that senses pressure of the fuel fluctuating in connection with the fuel injection from the injector;
• a combustion characteristic calculating unit for calculating a combustion characteristic concerning combustion in a cylinder based on both of the obtained sensing values of the cylinder pressure sensing value and the fuel pressure sensing value;
• and
• a controlling unit for controlling the injection mode and the intake air condition in accordance with the combustion characteristic calculated by the combustion characteristic calculating unit;
• an actual combustion quantity calculating unit for calculating an actual combustion quantity or a physical quantity equivalent to the actual combustion quantity based on the cylinder pressure sensing value;
• and
• a theoretical combustion quantity calculating unit for calculating an actual injection quantity based on the fuel pressure sensing value and for calculating a theoretical combustion quantity converted from the calculated actual injection quantity or a physical quantity equivalent to the theoretical combustion quantity, wherein
• the combustion characteristic calculating unit calculates a combustion rate as the combustion characteristic based on the calculated actual combustion quantity and the calculated theoretical combustion quantity, the combustion rate indicating a rate, at which the fuel injected from the injector contributes to the combustion.