Control apparatus and control method for internal combustion engine

Abstract

A control apparatus for an internal combustion engine provided with a fuel supply mechanism capable of adjusting a fuel supply amount includes a flow rate sensor that detects an intake air flow rate that represents a flow rate of air admitted into a combustion chamber of the internal combustion engine, a pressure sensor that detects a pressure of the air admitted into the combustion chamber of the internal combustion engine, a characteristic change estimation unit that estimates a characteristic change of the internal combustion engine in accordance with the intake air flow rate detected by the flow rate sensor and the intake air pressure detected by the pressure sensor, and a fuel supply mechanism control unit that controls the fuel supply mechanism. The fuel supply mechanism control unit controls the fuel supply mechanism such that the characteristic change in the internal combustion engine is compensated in accordance with an estimation performed by the characteristic change estimation unit.

1 . A measurement apparatus that measures an amount of air charged in a cylinder as an amount of air admitted into a combustion chamber of an internal combustion engine, the measurement apparatus comprising:
 a characteristic change estimation unit that estimates a characteristic change in the internal combustion engine in accordance with a predetermined condition the intake air flow rate detected by the flow rate sensor and the intake air pressure detected by the pressure sensor; and   an in-cylinder air charging amount calculation unit capable of correcting an amount of air charged in the cylinder so as to compensate the characteristic change in the internal combustion engine in accordance with an estimation performed by the characteristic change estimation unit.   
   
   
       2 . A measurement method that measures an amount of air charged in a cylinder as an amount of air admitted into a combustion chamber of an internal combustion engine, the measurement method comprising the steps of:
 estimating a characteristic change in the internal combustion engine in accordance with a predetermined condition the intake air flow rate and the intake air pressure; and   correcting an amount of air charged in the cylinder so as to compensate the characteristic change in the internal combustion engine in accordance with the estimation.