초록 ▼

Combustion pressure is detected using a cylinder pressure sensor, and a crank angle position corresponding to a centroid of combustion during a combustion period is obtained as a combustion centroid position, based on the detected combustion pressure. Combustion conditions are then detected based on

Combustion pressure is detected using a cylinder pressure sensor, and a crank angle position corresponding to a centroid of combustion during a combustion period is obtained as a combustion centroid position, based on the detected combustion pressure. Combustion conditions are then detected based on the detected combustion centroid position. On the other hand, depending on operating conditions, a crank angle position corresponding to a centroid of combustion during a combustion period for the case where desired combustion conditions are obtained, is set as a target centroid position, and an engine control quantity then feedback controlled so that the combustion centroid position becomes the target centroid position. In this way, combustion conditions of an internal combustion engine can be detected to a higher accuracy than with conventional arrangements wherein combustion conditions are detected based on fluctuations in an indicated mean effective pressure and the like, which shows only a comparatively small change with changes in combustion conditions. Moreover if engine control is carried out with the combustion centroid position as an index, then engine control accuracy can be significantly improved.

대표청구항 ▼

A method of detecting combustion conditions of an internal combustion engine comprising; a combustion pressure detecting step for detecting combustion pressure, a combustion centroid position detecting step for obtaining a crank angle position corresponding to a centroid of combustion during a combu

A method of detecting combustion conditions of an internal combustion engine comprising; a combustion pressure detecting step for detecting combustion pressure, a combustion centroid position detecting step for obtaining a crank angle position corresponding to a centroid of combustion during a combustion period as a combustion centroid position, based on said detected combustion pressure, and a combustion conditions detecting step for detecting combustion conditions based on said detected combustion centroid position.