ANGULAR VELOCITY AND ANGULAR ACCELERATION CALCULATION DEVICE, TORQUE ESTIMATION DEVICE, AND COMBUSTION STATE ESTIMATION DEVICE

摘要

PROBLEM TO BE SOLVED: To provide an angular velocity and angular acceleration calculation device calculating a crank angular velocity and an angular acceleration from a crank angle sensor signal, a torque estimation device estimating gas pressure torque and external force torque, and a combustion state estimation device estimating a combustion state.;SOLUTION: The crank angular velocity and angular acceleration calculation device, the torque estimation device and the combustion state estimation device in an internal combustion engine comprise at least a crank angle detection means 1 detecting a crank angle in the internal combustion engine and the time with the crank angle, a crank angle correction means 2 correcting the detected crank angle and a time into the ordinate crank angle and a time with the same intervals, and an angular velocity and angular acceleration calculation means 3 calculating the angular velocity and the angular acceleration of the crank by transforming a function of a time with respect to the crank angle corrected by the crank angle correction means 2 into a form regarded as a periodic function and calculating by using a discrete Fourier transform with respect to the function.;COPYRIGHT: (C)2010,JPO&INPIT