Method of detection of output fluctuation in internal combustion engine

摘要

An engine in which an elapsed time Ta(i) of 30° crank angle near top dead center of the compression stroke and an elapsed time Tb(i) of 30° crank angle near 90° after top dead center of the compression stroke are found. The difference DTa(i) of the elapsed times Ta(i) in a 720° crank angle range is found for the first cylinder and the second cylinder where combustion is performed after the first cylinder. The assumed elapsed time Tb'(i) assuming that there is no torque fluctuation is calculated from the difference of elapsed times DTa(i) of the first cylinder and the second cylinder and the assumed elapsed time Tb'(i) is used to calculate the amount of torque fluctuation.