Patent ID: 7809489
Filing Date: 2010-10-05
Classification: F02D,G01M

Abstract:
1. A method for determining cylinder interior pressure (P gas ) of an internal combustion engine from a cylinder pressure model having input variables comprising at least load, speed of rotation and crank angle, the method comprising the following steps: calculating a crank-angle-dependent pressure value in the cylinder (P calculating a gas alternating moment {tilde over (M)} calculating an alternating component of the gas moment ({tilde over (M)} from non-uniformity of rotation, by means of calculating a crank-angle-dependent moment of inertia (J(φ)) and a measured angular velocity ({dot over (φ)} KW,meas ) as well as an angular acceleration ({umlaut over (φ)} KW,meas ) at the crankshaft; and determining a correction value (ΔP