Patent ID: 8688358
Filing Date: 2014-04-01
Classification: F02D,G01M

Abstract:
1. A torque estimating system for an internal combustion engine including a plurality of cylinders, the system comprising: a cylinder pressure sensor disposed in a predetermined first cylinder of the internal combustion engine; means for acquiring a cylinder pressure of the first cylinder based on a detection signal of the cylinder pressure sensor; means for calculating a first crank angular acceleration resulting from an explosion in the first cylinder; means for calculating a second crank angular acceleration resulting from an explosion in a second cylinder in which the explosion takes place following the first cylinder; means for calculating measured indicated torque resulting from the explosion in the first cylinder based on the cylinder pressure of the first cylinder; and means for calculating estimated indicated torque resulting from the explosion in the second cylinder using a difference value between the second angular acceleration and the first angular acceleration, and the measured indicated torque of the first cylinder, wherein: the estimated indicated torque calculating means calculates a sum of the difference value multiplied by a moment of inertia and the measured indicated torque as the estimated indicated torque resulting from the explosion in the second cylinder.