Internal combustion engine control device and methd

Abstract

The ECU (20) of an internal combustion engine (1) estimates the quantity of air corresponding to the demand on the internal combustion engine (1), controls an injector (12) to inject an initial injection quantity of fuel determined such that the air / fuel ratio of the mixture in a combustion chamber (3) is a target level or less depending on the estimated quantity of air, calculates the quantity of air sucked into the combustion chamber (3) from the cylinder pressure in the combustion chamber (3) at a predetermined timing during the compression stroke before the ignition, and controls the injector (12) to inject a corrected injection quantity of fuel determined according to the calculated quantity of sucked air and the initial injection quantity such that the air / fuel ratio of the mixture in the combustion chamber (3) agrees with a target air / fuel ratio.

Description

technical field [0001] The present invention relates to a control device and control method for an internal combustion engine that generates power by burning a mixture of fuel and air in a combustion chamber. Background technique [0002] Conventionally, as a fuel injection method for an internal combustion engine, a well-known method is to first predict the amount of fuel that needs to be supplied to the combustion chamber, supply the predicted amount of fuel to the combustion chamber, and then predict the amount of fuel that needs to be supplied to the combustion chamber before closing the intake valve. After the amount of fuel is determined, the missing amount of fuel is obtained, and the missing amount of fuel is supplied to the combustion chamber again (for example, refer to Japanese Patent Application Laid-Open No. 1-285640). In this method, the amount of fuel to be supplied to the combustion chamber is predicted using the intake pipe pressure and engine speed calculat...

AI Technical Summary

Problems solved by technology

[0003] However, as shown in the existing examples above, it is difficult to accurately predict the amount of fuel that needs to be supplied to the combustion chamber even using the intake pipe pressure and engine speed calculated based on various parameters

Therefore, even with the existing method, the air-fuel ratio of the air-fuel mixture in the combustion chamber deviates from the target value.

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