Patent ID: 8150600
Filing Date: 2012-04-03
Classification: F02D,F02M,Y02T

Abstract:
1. 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 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; 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 start 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 to a condition promoting the combustion if the ignition delay is longer than the assumed time; the internal combustion engine has an exhaust gas recirculation valve that adjusts an exhaust gas recirculation quantity of exhaust gas recirculated from an exhaust system to an intake system, and the controlling unit controls an opening degree of the exhaust gas recirculation valve to increase the exhaust gas recirculation quantity when the ignition delay is shorter than the assumed time and controls the opening degree of the exhaust gas recirculation valve to decrease the exhaust gas recirculation quantity when the ignition delay is longer than the assumed time.